videotoolbox

func KVTAlphaChannelMode_PremultipliedAlpha ¶

func KVTAlphaChannelMode_PremultipliedAlpha() uintptr

func KVTAlphaChannelMode_StraightAlpha ¶

func KVTAlphaChannelMode_StraightAlpha() uintptr

func KVTCameraCalibrationExtrinsicOriginSource_StereoCameraSystemBaseline ¶

func KVTCameraCalibrationExtrinsicOriginSource_StereoCameraSystemBaseline() uintptr

func KVTCameraCalibrationLensAlgorithmKind_ParametricLens ¶

func KVTCameraCalibrationLensAlgorithmKind_ParametricLens() uintptr

func KVTCameraCalibrationLensDomain_Color ¶

func KVTCameraCalibrationLensDomain_Color() uintptr

func KVTCameraCalibrationLensRole_Left ¶

func KVTCameraCalibrationLensRole_Left() uintptr

func KVTCameraCalibrationLensRole_Mono ¶

func KVTCameraCalibrationLensRole_Mono() uintptr

func KVTCameraCalibrationLensRole_Right ¶

func KVTCameraCalibrationLensRole_Right() uintptr

func KVTCompressionPreset_Balanced ¶

func KVTCompressionPreset_Balanced() uintptr

@constant kVTCompressionPreset_Balanced @abstract A preset to provide a balanced compression quality and encoding speed. @discussion An encoder configured using this preset is expected to achieve a higher quality than an encoder configured with the preset kVTCompressionPreset_HighSpeed. The preset kVTCompressionPreset_HighSpeed may be preferred for a faster encoding. The preset kVTCompressionPreset_HighQuality may be preferred for a higher compression quality. See also kVTCompressionPreset_HighQuality, kVTCompressionPreset_HighSpeed, kVTCompressionPreset_VideoConferencing.

func KVTCompressionPreset_HighQuality ¶

func KVTCompressionPreset_HighQuality() uintptr

@constant kVTCompressionPreset_HighQuality @abstract A preset to achieve a high compression quality. @discussion An encoder configured using this preset is expected to achieve a higher quality with a slower encoding than an encoder configured with the preset kVTCompressionPreset_Balanced or kVTCompressionPreset_HighSpeed. The presets kVTCompressionPreset_Balanced and kVTCompressionPreset_HighSpeed may be preferred for a faster encoding. See also kVTCompressionPreset_Balanced, kVTCompressionPreset_HighSpeed, kVTCompressionPreset_VideoConferencing.

func KVTCompressionPreset_HighSpeed ¶

func KVTCompressionPreset_HighSpeed() uintptr

@constant kVTCompressionPreset_HighSpeed @abstract A preset to provide a high-speed encoding. @discussion An encoder configured using this preset is expected to achieve a faster encoding at a lower compression quality than an encoder configured with the preset kVTCompressionPreset_HighQuality or kVTCompressionPreset_Balanced. The presets kVTCompressionPreset_HighQuality and kVTCompressionPreset_Balanced may be preferred for a higher compression quality. See also kVTCompressionPreset_HighQuality, kVTCompressionPreset_Balanced, kVTCompressionPreset_VideoConferencing.

func KVTCompressionPreset_VideoConferencing ¶

func KVTCompressionPreset_VideoConferencing() uintptr

@constant kVTCompressionPreset_VideoConferencing @abstract A preset to achieve low-latency encoding for real-time communication applications. @discussion This preset requires setting kVTVideoEncoderSpecification_EnableLowLatencyRateControl to kCFBooleanTrue for encoding in the low-latency mode. See also kVTCompressionPreset_HighQuality, kVTCompressionPreset_Balanced, kVTCompressionPreset_HighSpeed.

func KVTCompressionPropertyCameraCalibrationKey_ExtrinsicOrientationQuaternion ¶

func KVTCompressionPropertyCameraCalibrationKey_ExtrinsicOrientationQuaternion() uintptr

func KVTCompressionPropertyCameraCalibrationKey_ExtrinsicOriginSource ¶

func KVTCompressionPropertyCameraCalibrationKey_ExtrinsicOriginSource() uintptr

func KVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrix ¶

func KVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrix() uintptr

func KVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixProjectionOffset ¶

func KVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixProjectionOffset() uintptr

func KVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixReferenceDimensions ¶

func KVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixReferenceDimensions() uintptr

func KVTCompressionPropertyCameraCalibrationKey_LensAlgorithmKind ¶

func KVTCompressionPropertyCameraCalibrationKey_LensAlgorithmKind() uintptr

The following keys are required in each kVTCompressionPropertyKey_CameraCalibrationDataLensCollection dictionary. @constant kVTCompressionPropertyCameraCalibrationKey_LensAlgorithmKind @abstract Specifies the camera calibration methodology. @discussion If the algorithm kind is ParametricLens, the camera lens collection requires camera intrinsic and extrinsic parameters. @constant kVTCompressionPropertyCameraCalibrationKey_LensDomain @abstract Specifies the kind of lens (e.g., color). @constant kVTCompressionPropertyCameraCalibrationKey_LensIdentifier @abstract Specifies a unique number associated with a lens. @constant kVTCompressionPropertyCameraCalibrationKey_LensRole @abstract Specifies the particular use of the lens in the camera system (e.g., left or right for a stereo system). @discussion For a stereoscopic camera system, one lens should have the left role and another should have the right role. @constant kVTCompressionPropertyCameraCalibrationKey_LensDistortions @abstract Specifies the first and second radial distortion coefficients(k1 and k2) used to correct the distortion that appeared as curved lines for straight lines and the first and second tangential distortion coefficients(p1 and p2) used to correct the distortion caused by a lens's improper alignment of physical elements. @discussion The values are in a CFArray of four CFNumbers in k1, k2, p1 and p2 order. @constant kVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialX @abstract Specifies a three element polynomial for mapping x axis UV parameters with an adjustment using the equation `x' = polynomialX[0] + polynomialX[1]*x + polynomialX[2]*x^3`. @discussion The values are in a CFArray of three CFNumbers(float) in the order polynomialX[0], polynomialX[1] & polynomialX[2]. The polynomial transform origin is at the center of the frame. The default values of elements of polynomialX[] are [0.0, 1.0, 0.0]. @constant kVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialY @abstract Specifies a three element polynomial for mapping y axis UV parameters with an adjustment using the equation `y' = polynomialY[0] + polynomialY[1]*y + polynomialY[2]*y^3`. @discussion The values are in a CFArray of three CFNumbers(float) in the order polynomialY[0], polynomialY[1] & polynomialY[2]. The polynomial transform origin is at the center of the frame. The default values of elements of polynomialY[] are [0.0, 1.0, 0.0]. @constant kVTCompressionPropertyCameraCalibrationKey_RadialAngleLimit @abstract Specifies the outer limit of the calibration validity in degrees of angle eccentric from the optical axis. @discussion The value is linked to radial distortion corrections with k1 and k2. @constant kVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrix @abstract Specifies the 3x3 camera intrinsic matrix for camera calibration. @discussion Camera intrinsic matrix is a CFData containing a matrix_float3x3, which is column-major. Each element is in IEEE754 native-endian 32-bit floating point. It has the following contents: fx s cx 0 fy cy 0 0 1 fx and fy are the focal length in pixels. For square pixels, they will have the same value. cx and cy are the coordinates of the principal point. The origin is the upper left of the frame. s is an optional skew factor. @constant kVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixProjectionOffset @abstract Specifies the offset of the point of perspective relative to the rectilinear projection. @constant kVTCompressionPropertyCameraCalibrationKey_IntrinsicMatrixReferenceDimensions @abstract Specifies the image dimensions to which the camera’s intrinsic matrix values are relative. @discussion Values are width and height in a CFDictionary. Dictionary keys are compatible with CGSize dictionary, namely "Width" and "Height". @constant kVTCompressionPropertyCameraCalibrationKey_ExtrinsicOriginSource @abstract Identifies how the origin of the camera system's extrinsics are determined. @discussion The 'blin' value indicates the center of transform is determined by the point mid way along the dimensions indicated by the StereoCameraSystemBaselineBox held in the StereoCameraSystemBox. Each left and right lens within a stereoscopic camera system is equidistant from this point, so the 'blin' value is halved when associated with the respective left and right lenses. @constant kVTCompressionPropertyCameraCalibrationKey_ExtrinsicOrientationQuaternion @abstract Specifies a camera’s orientation to a world or scene coordinate system. The orientation value is a unit quaternion(ix, iy, and iz) instead of the classical 3x3 matrix. @discussion The values are in a CFArray of three CFNumbers in ix, iy, and iz order.

func KVTCompressionPropertyCameraCalibrationKey_LensDistortions ¶

func KVTCompressionPropertyCameraCalibrationKey_LensDistortions() uintptr

func KVTCompressionPropertyCameraCalibrationKey_LensDomain ¶

func KVTCompressionPropertyCameraCalibrationKey_LensDomain() uintptr

func KVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialX ¶

func KVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialX() uintptr

func KVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialY ¶

func KVTCompressionPropertyCameraCalibrationKey_LensFrameAdjustmentsPolynomialY() uintptr

func KVTCompressionPropertyCameraCalibrationKey_LensIdentifier ¶

func KVTCompressionPropertyCameraCalibrationKey_LensIdentifier() uintptr

func KVTCompressionPropertyCameraCalibrationKey_LensRole ¶

func KVTCompressionPropertyCameraCalibrationKey_LensRole() uintptr

func KVTCompressionPropertyCameraCalibrationKey_RadialAngleLimit ¶

func KVTCompressionPropertyCameraCalibrationKey_RadialAngleLimit() uintptr

func KVTCompressionPropertyKey_AllowFrameReordering ¶

func KVTCompressionPropertyKey_AllowFrameReordering() uintptr

@constant kVTCompressionPropertyKey_AllowFrameReordering @abstract Enables frame reordering. @discussion In order to encode B frames, a video encoder must reorder frames, which means that the order in which they will be emitted and stored (the decode order) is different from the order in which they were presented to the video encoder (the display order). True by default. Set this to false to prevent frame reordering.

func KVTCompressionPropertyKey_AllowOpenGOP ¶

func KVTCompressionPropertyKey_AllowOpenGOP() uintptr

@constant kVTCompressionPropertyKey_AllowOpenGOP @abstract Enables Open GOP (Group Of Pictures) encoding. @discussion Only applicable to certain video encoders. For HEVC encoding the property value is kCFBooleanTrue by default - which means that the encoder may use Open GOP structures, but it is not guaranteed to. Set this to kCFBooleanFalse to prevent the encoder from using any form of Open GOP during encoding. If set to kCFBooleanFalse, this will mean that the encoder will generate groups of pictures that are independently decodable; there will be no frame dependencies across sync samples (frames where kCMSampleAttachmentKey_NotSync is absent or kCFBooleanFalse) When the value is kCFBooleanTrue, the encoder may use Open GOP frame dependency structures to increase compression efficiency or quality.

func KVTCompressionPropertyKey_AllowTemporalCompression ¶

func KVTCompressionPropertyKey_AllowTemporalCompression() uintptr

@constant kVTCompressionPropertyKey_AllowTemporalCompression @abstract Enables temporal compression. @discussion True by default. Set this to false to require key-frame-only compression.

func KVTCompressionPropertyKey_AlphaChannelMode ¶

func KVTCompressionPropertyKey_AlphaChannelMode() uintptr

@constant kVTCompressionPropertyKey_AlphaChannelMode @abstract Specifies whether the source images' RGB values have been premultiplied by the alpha channel values. @discussion Video compression will fail if source image buffers have a mismatched value in their kCVImageBufferAlphaChannelMode attachment. If this property is not set, the encoder may read the first source image buffer's kCVImageBufferAlphaChannelMode attachment. If neither the property nor the first buffer's attachment is set, defaults to kVTAlphaChannelMode_PremultipliedAlpha.

func KVTCompressionPropertyKey_AspectRatio16x9 ¶

func KVTCompressionPropertyKey_AspectRatio16x9() uintptr

@constant kVTCompressionPropertyKey_AspectRatio16x9 @abstract Indicates that the DV video stream should have the 16x9 flag set. @discussion This property is supported by the DV25/50 family of encoders. When false, the picture aspect ratio is 4:3. When true, the picture aspect ratio is 16:9. Either way, a fixed PixelAspectRatio is used (the specific value depends on whether the format is NTSC or PAL).

func KVTCompressionPropertyKey_AverageBitRate ¶

func KVTCompressionPropertyKey_AverageBitRate() uintptr

@constant kVTCompressionPropertyKey_AverageBitRate @abstract The long-term desired average bit rate in bits per second. @discussion This is not a hard limit; the bit rate may peak above this. The default bit rate is zero, which indicates that the video encoder should determine the size of compressed data. Note that bit rate settings only have an effect when timing information is provided for source frames, and that some codecs do not support limiting to specified bit rates.

func KVTCompressionPropertyKey_BaseLayerBitRateFraction ¶

func KVTCompressionPropertyKey_BaseLayerBitRateFraction() uintptr

@constant kVTCompressionPropertyKey_BaseLayerBitRateFraction @abstract This property indicates the desired bit rate fraction of the base layer @discussion This is not a hard limit; the encoder will attempt to satisfy this ratio when possible. If not set, the encoder will manage the ratio. For example: If the target bitrate is set to 500kbps and kVTCompressionPropertyKey_BaseLayerBitRateFraction is set to 0.6, the base layer will be given a budget of 300kbps and the enhancement layer 200kbps.

func KVTCompressionPropertyKey_BaseLayerFrameRate ¶

func KVTCompressionPropertyKey_BaseLayerFrameRate() uintptr

@constant kVTCompressionPropertyKey_BaseLayerFrameRate @abstract This property indicates the desired frame rate for the base temporal layer used in hierarchical video encoding. @discussion The frame rate is measured in frames per second. This property is only implemented by encoders which support hierarchical frame encoding, and requests that this encoding feature be enabled.

func KVTCompressionPropertyKey_BaseLayerFrameRateFraction ¶

func KVTCompressionPropertyKey_BaseLayerFrameRateFraction() uintptr

@constant kVTCompressionPropertyKey_BaseLayerFrameRateFraction @abstract This property indicates the desired frame rate fraction of the base layer. @discussion This property indicates the fraction of total frames submitted that should be encoded in the base layer. For example, a value of 0.5 means that half of the frames are in the base layer, and half are in the enhancement layer.

func KVTCompressionPropertyKey_CalculateMeanSquaredError ¶

func KVTCompressionPropertyKey_CalculateMeanSquaredError() uintptr

@constant kVTCompressionPropertyKey_CalculateMeanSquaredError @abstract This property requests that the encoder measure and output the Mean Squared Error(MSE) quality metric. @discussion The MSE value returned may be measured using an internal representation of the decoded frame which may lack filtering or processing present in the actual decoded frame. Because of this, there may be a small delta between the reported MSE and the true MSE. If supported, the MSE values will be returned as sample buffer attachments on the encoded frame using the kVTSampleAttachmentKey_QualityMetrics key.

func KVTCompressionPropertyKey_CameraCalibrationDataLensCollection ¶

func KVTCompressionPropertyKey_CameraCalibrationDataLensCollection() uintptr

@constant kVTCompressionPropertyKey_CameraCalibrationDataLensCollection @abstract Specifies intrinsic and extrinsic parameters for single or multiple lenses. @discussion The property value is an array of dictionaries describing the camera calibration data for each lens. The camera calibration data includes intrinsics and extrinics with other parameters. For a stereoscopic camera system, the left and right lens signaling can be done with the kVTCompressionPropertyCameraCalibrationKey_LensRole key and its value.

func KVTCompressionPropertyKey_CleanAperture ¶

func KVTCompressionPropertyKey_CleanAperture() uintptr

@constant kVTCompressionPropertyKey_CleanAperture @abstract Describes the clean aperture for encoded frames. @discussion Some video encoders may enforce specific clean apertures; in those cases this property will be read-only (SetProperty will return kVTPropertyReadOnlyErr). The clean aperture will be set on the format description for output samples, and may affect source frame scaling. NULL is a valid value for this property, meaning that the clean aperture is the full width and height.

func KVTCompressionPropertyKey_ColorPrimaries ¶

func KVTCompressionPropertyKey_ColorPrimaries() uintptr

@constant kVTCompressionPropertyKey_ColorPrimaries @abstract Indicates color primaries for compressed content. @discussion Some video encoders may enforce specific colorimetry; in those cases this property will be read-only (SetProperty will return kVTPropertyReadOnlyErr). The value will be set on the format description for output sample buffers.

func KVTCompressionPropertyKey_ConstantBitRate ¶

func KVTCompressionPropertyKey_ConstantBitRate() uintptr

@constant kVTCompressionPropertyKey_ConstantBitRate @abstract Requires that the encoder use a Constant Bit Rate algorithm. @discussion The property kVTCompressionPropertyKey_ExpectedFrameRate should be set along with kVTCompressionPropertyKey_ConstantBitRate to ensure effective CBR rate control. This property is not compatible with kVTCompressionPropertyKey_DataRateLimits, kVTCompressionPropertyKey_AverageBitRate, and kVTCompressionPropertyKey_VariableBitRate. The encoder will pad the frame if they are smaller than they need to be based on the Constant BitRate. This property is not recommended for general streaming or export scenarios. It is intended for interoperability with certain streaming CDNs which specifically require that data rates not drop even during low motion and activity scenes. This is not supported in all encoders or in all encoder operating modes. kVTPropertyNotSupportedErr will be returned when this option is not supported.

func KVTCompressionPropertyKey_ContentLightLevelInfo ¶

func KVTCompressionPropertyKey_ContentLightLevelInfo() uintptr

@constant kVTCompressionPropertyKey_ContentLightLevelInfo @abstract The value is 4 bytes containing a big-endian structure as defined in the Content Light Level Info SEI message. @discussion The value will be set on the format description for output sample buffers, and incorporated into the appropriate SEI NAL unit where supported by the encoder.

func KVTCompressionPropertyKey_DataRateLimits ¶

func KVTCompressionPropertyKey_DataRateLimits() uintptr

@constant kVTCompressionPropertyKey_DataRateLimits @abstract Zero, one or two hard limits on data rate. @discussion Each hard limit is described by a data size in bytes and a duration in seconds, and requires that the total size of compressed data for any contiguous segment of that duration (in decode time) must not exceed the data size. By default, no data rate limits are set. The property is a CFArray of an even number of CFNumbers, alternating between bytes and seconds. Note that data rate settings only have an effect when timing information is provided for source frames, and that some codecs do not support limiting to specified data rates. When both kVTCompressionPropertyKey_DataRateLimits and kVTCompressionPropertyKey_AverageBitRate are supported, it is recommended that kVTCompressionPropertyKey_AverageBitRate be set when kVTCompressionPropertyKey_DataRateLimits is set. If kVTCompressionPropertyKey_AverageBitRate is not specified, an overall average bit rate target will be selected at a safe margin below the kVTCompressionPropertyKey_DataRateLimits target, so that regional overshoot in the encoding will not exceed the kVTCompressionPropertyKey_DataRateLimits. The overall average bitrate target generated from kVTCompressionPropertyKey_DataRateLimits in the absence of kVTCompressionPropertyKey_AverageBitRate may not be ideal for all scenarios. Encoding is more likely to undershoot a requested kVTCompressionPropertyKey_AverageBitRate if the specified target is too close to a hard limit specified by kVTCompressionPropertyKey_DataRateLimits.

func KVTCompressionPropertyKey_Depth ¶

func KVTCompressionPropertyKey_Depth() uintptr

@constant kVTCompressionPropertyKey_Depth @abstract The pixel depth of the encoded video. @discussion This property is only supported by video encoders for formats that are tied to particular pixel formats (eg, 16-bit RGB, 24-bit RGB).

func KVTCompressionPropertyKey_EnableLTR ¶

func KVTCompressionPropertyKey_EnableLTR() uintptr

@constant kVTCompressionPropertyKey_EnableLTR @abstract Enable Long Term Reference (LTR) frames during encoding @discussion When an LTR frame is encoded, encoder will signal a unique token of the LTR frame in the encoder callback through: kVTSampleAttachmentKey_RequireLTRAcknowledgementToken Clients are responsible for reporting acknowledged LTR frames to the encoder through: kVTEncodeFrameOptionKey_AcknowledgedLTRTokens Client can request a refresh frame at any time through: kVTEncodeFrameOptionKey_ForceLTRRefresh Encoder will encode a P frame by using one of acknowledged LTR frames as the reference. Encoder will encode a new reference frame using an acknowledged LTR, or an IDR if no LTR frames have been acknowledged. Also see: kVTEncodeFrameOptionKey_AcknowledgedLTRTokens kVTEncodeFrameOptionKey_ForceLTRRefresh kVTSampleAttachmentKey_RequireLTRAcknowledgementToken

func KVTCompressionPropertyKey_EncoderID ¶

func KVTCompressionPropertyKey_EncoderID() uintptr

@constant kVTCompressionPropertyKey_EncoderID @abstract Specifies a particular video encoder by its ID string. @discussion Matches the value specified in kVTVideoEncoderSpecification_EncoderID, and the kVTVideoEncoderList_EncoderID value returned from VTCopyVideoEncoderList.

func KVTCompressionPropertyKey_EstimatedAverageBytesPerFrame ¶

func KVTCompressionPropertyKey_EstimatedAverageBytesPerFrame() uintptr

@constant kVTCompressionPropertyKey_EstimatedAverageBytesPerFrame @abstract Returns the encoder's estimate of the expected size of a single encoded frame in bytes, based on current configuration. @discussion When supported, this option is intended to allow clients to estimate the output file size for an encoded video stream. This property is not implemented by all video encoders.

func KVTCompressionPropertyKey_ExpectedDuration ¶

func KVTCompressionPropertyKey_ExpectedDuration() uintptr

@constant kVTCompressionPropertyKey_ExpectedDuration @abstract Indicates the expected total duration for the compression session, if known. @discussion By default, this is zero, indicating "unknown".

func KVTCompressionPropertyKey_ExpectedFrameRate ¶

func KVTCompressionPropertyKey_ExpectedFrameRate() uintptr

@constant kVTCompressionPropertyKey_ExpectedFrameRate @abstract Indicates the expected frame rate of the video to be encoded. @discussion The frame rate is measured in frames per second. This property is used to inform the encoder of the expected cadence of the presentation time stamp values of frames that will be submitted to the encoder. The actual frame rate may vary, and will depend on the frame durations calculated by the difference between subsequent presentation time stamps. If kVTCompressionPropertyKey_RealTime has been set to true, the ExpectedFrameRate may be used to optimize energy usage as well as perform internal encoder configuration before compression begins. If kVTCompressionPropertyKey_RealTime is not set, or has been set to false, the ExpectedFrameRate is still helpful and allows the encoder to optimize internal encoder configuration before compression begins. By default, the property has a value of zero indicating "unknown".

func KVTCompressionPropertyKey_FieldCount ¶

func KVTCompressionPropertyKey_FieldCount() uintptr

@constant kVTCompressionPropertyKey_FieldCount @abstract Indicates whether the frames should be encoded progressive (1) or interlaced (2). @discussion The field count will be set on the format description for output samples, and may affect source frame scaling. NULL is a valid value for this property.

func KVTCompressionPropertyKey_FieldDetail ¶

func KVTCompressionPropertyKey_FieldDetail() uintptr

@constant kVTCompressionPropertyKey_FieldDetail @abstract Indicates field ordering for encoded interlaced frames. @discussion Some video encoders may enforce specific field ordering; in those cases this property will be read-only (SetProperty will return kVTPropertyReadOnlyErr). The field detail will be set on the format description for output samples, and may affect source frame scaling. NULL is a valid value for this property.

func KVTCompressionPropertyKey_GammaLevel ¶

func KVTCompressionPropertyKey_GammaLevel() uintptr

@constant kVTCompressionPropertyKey_GammaLevel @abstract Indicates gamma level for compressed content. @discussion This property allows the caller to specify a gamma value to include in the CMVideoFormatDescription attached to output CMSampleBuffers. It does not change pixel data being encoded.

func KVTCompressionPropertyKey_H264EntropyMode ¶

func KVTCompressionPropertyKey_H264EntropyMode() uintptr

@constant kVTCompressionPropertyKey_H264EntropyMode @abstract The entropy encoding mode for H.264 compression. @discussion If supported by an H.264 encoder, this property controls whether the encoder should use Context-based Adaptive Variable Length Coding (CAVLC) or Context-based Adaptive Binary Arithmetic Coding (CABAC). CABAC generally gives better compression at the expense of higher computational overhead. The default value is encoder-specific and may change depending on other encoder settings. Care should be taken when using this property -- changes may result in a configuration which is not compatible with a requested Profile and Level. Results in this case are undefined, and could include encode errors or a non-compliant output stream.

func KVTCompressionPropertyKey_HDRMetadataInsertionMode ¶

func KVTCompressionPropertyKey_HDRMetadataInsertionMode() uintptr

@constant kVTCompressionPropertyKey_HDRMetadataInsertionMode @abstract The mode for HDR metadata in the output bitstream. @discussion If set to kVTHDRMetadataInsertionMode_None, no HDR metadata will be present in the output bitstream. For other modes, VTCompressionSession will determine what type of HDR metadata to insert based on the output color space. e.g. DolbyVision, HDR10, etc. This property has no effect if the output color space is not HDR, or if there is currently no underlying support for the HDR format. kVTHDRMetadataInsertionMode_RequestSDRRangePreservation will only insert metadata when the following is true: transfer function is kCVImageBufferTransferFunction_SMPTE_ST_2084_PQ color primaries is kCVImageBufferColorPrimaries_ITU_R_2020 color matrix is kCVImageBufferYCbCrMatrix_ITU_R_2020

func KVTCompressionPropertyKey_HasLeftStereoEyeView ¶

func KVTCompressionPropertyKey_HasLeftStereoEyeView() uintptr

@constant kVTCompressionPropertyKey_HasLeftStereoEyeView @abstract Specifies the value of kCMFormatDescriptionExtension_HasLeftStereoEyeView. @discussion The value will be set on the format description for output samples and may affect the decoded frame presentation.

func KVTCompressionPropertyKey_HasRightStereoEyeView ¶

func KVTCompressionPropertyKey_HasRightStereoEyeView() uintptr

@constant kVTCompressionPropertyKey_HasRightStereoEyeView @abstract Specifies the value of kCMFormatDescriptionExtension_HasRightStereoEyeView. @discussion The value will be set on the format description for output samples and may affect the decoded frame presentation.

func KVTCompressionPropertyKey_HeroEye ¶

func KVTCompressionPropertyKey_HeroEye() uintptr

@constant kVTCompressionPropertyKey_HeroEye @abstract Specifies the value of kCMFormatDescriptionExtension_HeroEye. @discussion The value will be set on the format description for output samples and may affect the decoded frame presentation.

func KVTCompressionPropertyKey_HorizontalDisparityAdjustment ¶

func KVTCompressionPropertyKey_HorizontalDisparityAdjustment() uintptr

func KVTCompressionPropertyKey_HorizontalFieldOfView ¶

func KVTCompressionPropertyKey_HorizontalFieldOfView() uintptr

@constant kVTCompressionPropertyKey_HorizontalFieldOfView @abstract Specifies the value of kCMFormatDescriptionExtension_HorizontalFieldOfView. @discussion The value is a CFNumber holding an unsigned 32-bit integer that is interpreted in millidegree or thousandths of a degree (e.g., 123456 is 123.456 degree). This property is optional and should only be specified if the field of view is known.

func KVTCompressionPropertyKey_ICCProfile ¶

func KVTCompressionPropertyKey_ICCProfile() uintptr

@constant kVTCompressionPropertyKey_ICCProfile @abstract Indicates ICC profile for compressed content. @discussion Some video encoders may enforce specific colorimetry; in those cases this property will be read-only (SetProperty will return kVTPropertyReadOnlyErr). If this property and any of the previous three are all set, they should be set to consistent values, or undefined behavior may occur. The value will be set on the format description for output sample buffers. NULL can be a valid value for this property.

func KVTCompressionPropertyKey_MVHEVCLeftAndRightViewIDs ¶

func KVTCompressionPropertyKey_MVHEVCLeftAndRightViewIDs() uintptr

@constant kVTCompressionPropertyKey_MVHEVCLeftAndRightViewIDs @abstract Specifies which of the ViewIDs provided via kVTCompressionPropertyKey_MVHEVCViewIDs is the "left view id" and which is the "right view id". @discussion MV-HEVC specific. These ViewIDs will be incorporated into the 3D Reference Displays Info SEI message. The property value is a CFArray containing two ViewIDs as CFNumbers with the first correspponding to the left eye and the second corresponding to the right eye. The property is NULL by default.

func KVTCompressionPropertyKey_MVHEVCVideoLayerIDs ¶

func KVTCompressionPropertyKey_MVHEVCVideoLayerIDs() uintptr

@constant kVTCompressionPropertyKey_MVHEVCVideoLayerIDs @abstract Requests multi-image encoding; advises encoder to expect CMTaggedBufferGroups with specific CMTags referencing these MV-HEVC VideoLayerIDs. @discussion MV-HEVC specific. The property value is a CFArray containing VideoLayerIDs as CFNumbers. The property is NULL by default.

func KVTCompressionPropertyKey_MVHEVCViewIDs ¶

func KVTCompressionPropertyKey_MVHEVCViewIDs() uintptr

@constant kVTCompressionPropertyKey_MVHEVCViewIDs @abstract Specifies the ViewIDs corresponding to the VideoLayerIDs provided via kVTCompressionPropertyKey_MVHEVCVideoLayerIDs. @discussion MV-HEVC specific. The property value is a CFArray containing ViewIDs as CFNumbers. The entries in this array should be in the same order and have the same count as the value set via kVTCompressionPropertyKey_MVHEVCVideoLayerIDs. The property is NULL by default.

func KVTCompressionPropertyKey_MasteringDisplayColorVolume ¶

func KVTCompressionPropertyKey_MasteringDisplayColorVolume() uintptr

@constant kVTCompressionPropertyKey_MasteringDisplayColorVolume @abstract The value is 24 bytes containing a big-endian structure as defined in ISO/IEC 23008-2:2015(E), D.2.28 Mastering display colour volume SEI message. @discussion The value will be set on the format description for output sample buffers, and incorporated into the appropriate SEI NAL unit where supported by the encoder.

func KVTCompressionPropertyKey_MaxAllowedFrameQP ¶

func KVTCompressionPropertyKey_MaxAllowedFrameQP() uintptr

@constant kVTCompressionPropertyKey_MaxAllowedFrameQP @abstract Specifies the maximum allowed encoded frame QP (Quantization Parameter). @discussion This is an optional parameter. Use it only when you have a specific requirement for the video quality and you are familiar with frame QP. To satisfy this requirement, the encoder may drop frames to maintain bitrate and QP goals. This is not supported in all encoders or in all encoder operating modes. kVTPropertyNotSupportedErr will be returned when this option is not supported.

func KVTCompressionPropertyKey_MaxFrameDelayCount ¶

func KVTCompressionPropertyKey_MaxFrameDelayCount() uintptr

@constant kVTCompressionPropertyKey_MaxFrameDelayCount @abstract The maximum frame delay count is the maximum number of frames that a compressor is allowed to hold before it must output a compressed frame. @discussion It limits the number of frames that may be held in the "compression window". If the maximum frame delay count is M, then before the call to encode frame N returns, frame N-M must have been emitted. The default is kVTUnlimitedFrameDelayCount, which sets no limit on the compression window.

func KVTCompressionPropertyKey_MaxH264SliceBytes ¶

func KVTCompressionPropertyKey_MaxH264SliceBytes() uintptr

@constant kVTCompressionPropertyKey_MaxH264SliceBytes @abstract Specifies the maximum slice size for H.264 encoding @discussion If supported by an H.264 encoder, the value limits the size in bytes of slices produced by the encoder, where possible. By default, no limit is specified. A value of zero implies default behavior.

func KVTCompressionPropertyKey_MaxKeyFrameInterval ¶

func KVTCompressionPropertyKey_MaxKeyFrameInterval() uintptr

@constant kVTCompressionPropertyKey_MaxKeyFrameInterval @abstract The maximum interval between key frames, also known as the key frame rate. @discussion Key frames, also known as sync frames, reset inter-frame dependencies; decoding a key frame is sufficient to prepare a decoder for correctly decoding the difference frames that follow. Video encoders are allowed to generate key frames more frequently if this would result in more efficient compression. The default key frame interval is 0, which indicates that the video encoder should choose where to place all key frames. A key frame interval of 1 indicates that every frame must be a key frame, 2 indicates that at least every other frame must be a key frame, etc. See also kVTCompressionPropertyKey_AllowTemporalCompression. This key can be set in conjunction with kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration, and both limits will be enforced - requiring a keyframe every X frames or every Y seconds, whichever comes first.

func KVTCompressionPropertyKey_MaxKeyFrameIntervalDuration ¶

func KVTCompressionPropertyKey_MaxKeyFrameIntervalDuration() uintptr

@constant kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration @abstract The maximum duration from one key frame to the next in seconds. @discussion Zero by default, which means no limit. This property is particularly useful when the frame rate is variable. See kVTCompressionPropertyKey_MaxKeyFrameInterval for more discussion of key frames. This key can be set in conjunction with kVTCompressionPropertyKey_MaxKeyFrameInterval, and both limits will be enforced - requiring a keyframe every X frames or every Y seconds, whichever comes first.

func KVTCompressionPropertyKey_MaximizePowerEfficiency ¶

func KVTCompressionPropertyKey_MaximizePowerEfficiency() uintptr

@constant kVTCompressionPropertyKey_MaximizePowerEfficiency @abstract Hints to the video encoder that it should maximize power efficiency during encode. @discussion For compression where the client is operating in the background, clients may set this property to kCFBooleanTrue, which indicates that the encoder can take steps to minimize impact on power usage and other system activity. Setting the property to NULL is equivalent to setting it to kCFBooleanFalse. Not all video encoders support this property. By default, this property is NULL. If the kVTCompressionPropertyKey_RealTime property is set to kCFBooleanTrue, the video encoder may act as though this property were set to kCFBooleanFalse.

func KVTCompressionPropertyKey_MaximumRealTimeFrameRate ¶

func KVTCompressionPropertyKey_MaximumRealTimeFrameRate() uintptr

@constant kVTCompressionPropertyKey_MaximumRealTimeFrameRate @abstract Indicates the maximum real time rate at which frames could be submitted to the VTCompressionSession @discussion The frame rate is measured in frames per second. This property can be used to inform the encoder of the maximum rate that frames could be submitted to the encoder during realtime encoding. This allows the encoder to configure itself to ensure this capability. This property can only be used when kVTCompressionPropertyKey_RealTime has been set to true. Unlike kVTCompressionPropertyKey_ExpectedFrameRate, this property informs the maximum possible rate that the VTCompressionSession could see, not the average frame rate that is expected in normal operation. By default, the property has a value of zero indicating "unknown".

func KVTCompressionPropertyKey_MinAllowedFrameQP ¶

func KVTCompressionPropertyKey_MinAllowedFrameQP() uintptr

@constant kVTCompressionPropertyKey_MinAllowedFrameQP @abstract Specifies the minimum allowed encoded frame QP (Quantization Parameter). @discussion This is an optional parameter. Use it only when you have a specific requirement for the video quality and you are familiar with frame QP. This is not supported in all encoders or in all encoder operating modes. kVTPropertyNotSupportedErr will be returned when this option is not supported.

func KVTCompressionPropertyKey_MoreFramesAfterEnd ¶

func KVTCompressionPropertyKey_MoreFramesAfterEnd() uintptr

@constant kVTCompressionPropertyKey_MoreFramesAfterEnd @abstract Indicates whether and how a compression session's frames will be concatenated with other compressed frames to form a longer series. @discussion True if frames compressed in a separate session will be concatenated following the end of this one. False if this is a stand-alone session, or if this session will encode the last segment of a multi-segment compression. By default, false.

func KVTCompressionPropertyKey_MoreFramesBeforeStart ¶

func KVTCompressionPropertyKey_MoreFramesBeforeStart() uintptr

@constant kVTCompressionPropertyKey_MoreFramesBeforeStart @abstract Indicates whether and how a compression session's frames will be concatenated with other compressed frames to form a longer series. @discussion True if frames compressed in a separate session will be concatenated before the beginning of this one. False if this is a stand-alone session, or if this session will encode the first segment of a multi-segment compression. By default, false. This information enables video encoders to ensure that compressed segments can be concatenated smoothly -- for example, avoiding data rate spikes where segments are joined.

func KVTCompressionPropertyKey_MultiPassStorage ¶

func KVTCompressionPropertyKey_MultiPassStorage() uintptr

@const kVTCompressionPropertyKey_MultiPassStorage @abstract Enables multi-pass compression and provides storage for encoder-private data. @discussion Some video encoders support multi-pass encoding. To determine whether a VTCompressionSession supports multi-pass encoding, you can inspect the dictionary returned by VTSessionCopySupportedPropertyDictionary to see if it contains kVTCompressionPropertyKey_MultiPassStorage. To enable multi-pass encoding, set the kVTCompressionPropertyKey_MultiPassStorage property to a VTMultiPassStorage object, which you can create by calling VTMultiPassStorageCreate. Then make one or more passes over the source frames. Bracket each pass with a call to VTCompressionSessionBeginPass at the beginning and VTCompressionSessionEndPass at the end. In the first pass of multi-pass encoding, call VTCompressionSessionEncodeFrame for every source frame (just as in single-pass encoding). At the end of every pass, call VTCompressionSessionEndPass. This may take some time as the video encoder determines whether it can improve the encoding by performing another pass. If the user cancels encoding during this time, call VTCompressionSessionInvalidate to interrupt the processing. VTCompressionSessionEndPass will indicate via the furtherPassesRequestedOut argument whether the video encoder would like to perform another pass. There is no particular bound on the number of passes the video encoder may request, but the client is free to disregard this request and use the last-emitted set of frames. If *furtherPassesRequestedOut is set to true and you want to perform another pass, call VTCompressionSessionGetTimeRangesForNextPass to determine the time ranges for the next pass. Only the source frames within these time ranges need to be passed to VTCompressionSessionEncodeFrame; the video encoder is satisfied with the already-emitted compressed frames outside these ranges and they can be kept for the final output. In second and successive passes, you must pass identical source frames, frame properties and timestamps to VTCompressionSessionEncodeFrame as in the first pass, with the exception that frames not in the requested time ranges should be skipped. You can create and use a VTFrameSilo object to merge sequences of compressed frames across passes during multi-pass encoding.

func KVTCompressionPropertyKey_NumberOfPendingFrames ¶

func KVTCompressionPropertyKey_NumberOfPendingFrames() uintptr

@constant kVTCompressionPropertyKey_NumberOfPendingFrames @abstract The number of pending frames in the compression session. @discussion This number may decrease asynchronously.

func KVTCompressionPropertyKey_OutputBitDepth ¶

func KVTCompressionPropertyKey_OutputBitDepth() uintptr

@constant kVTCompressionPropertyKey_OutputBitDepth @abstract When set, requires the encoder to output bitstream with the requested bit depth, if supported by the configured profile level setting. In the absence of this property, the video encoder will assume the highest bit depth allowable by the configured profile level setting.

func KVTCompressionPropertyKey_PixelAspectRatio ¶

func KVTCompressionPropertyKey_PixelAspectRatio() uintptr

@constant kVTCompressionPropertyKey_PixelAspectRatio @abstract Describes the pixel aspect ratio for encoded frames. @discussion Some video encoders may enforce specific pixel aspect ratios; in those cases this property will be read-only (SetProperty will return kVTPropertyReadOnlyErr). The pixel aspect ratio will be set on the format description for output samples, and may affect source frame scaling. NULL is a valid value for this property, meaning square pixels (1:1).

func KVTCompressionPropertyKey_PixelBufferPoolIsShared ¶

func KVTCompressionPropertyKey_PixelBufferPoolIsShared() uintptr

@constant kVTCompressionPropertyKey_PixelBufferPoolIsShared @abstract Indicates whether the a common pixel buffer pool is shared between the video encoder and the session client. @discussion This is false if separate pools are used because the video encoder's and the client's pixel buffer attributes were incompatible.

func KVTCompressionPropertyKey_PixelTransferProperties ¶

func KVTCompressionPropertyKey_PixelTransferProperties() uintptr

@constant kVTCompressionPropertyKey_PixelTransferProperties @abstract Specifies properties to configure a VTPixelTransferSession used to transfer source frames from the client's image buffers to the video encoder's image buffers, if necessary. @discussion Setting this property alone does not necessarily guarantee that a VTPixelTransferSession will be created. See VTPixelTransferProperties.h.

func KVTCompressionPropertyKey_PreserveAlphaChannel ¶

func KVTCompressionPropertyKey_PreserveAlphaChannel() uintptr

@constant kVTCompressionPropertyKey_PreserveAlphaChannel @abstract Instructs the encoder to encode or discard the alpha channel of input video frames @discussion This property allows a client to specify whether or not the alpha channel in the source pixelBuffers should be encoded. The client may set this to kCFBooleanFalse in cases where they are not interested in preserving alpha, or if the alpha channel is known to be fully opaque. This property is not supported by all encoders.

func KVTCompressionPropertyKey_PreserveDynamicHDRMetadata ¶

func KVTCompressionPropertyKey_PreserveDynamicHDRMetadata() uintptr

@constant kVTCompressionPropertyKey_PreserveDynamicHDRMetadata @abstract Controls whether or not to preserve any dynamic HDR metadata on the input pixel buffer @discussion If set to false, and kVTCompressionPropertyKey_HDRMetadataInsertionMode is not kVTHDRMetadataInsertionMode_None, then VTCompressionSession will generate the dynamic HDR metadata for the pixel buffer, if the HDR format is supported.

func KVTCompressionPropertyKey_PrioritizeEncodingSpeedOverQuality ¶

func KVTCompressionPropertyKey_PrioritizeEncodingSpeedOverQuality() uintptr

@constant kVTCompressionPropertyKey_PrioritizeEncodingSpeedOverQuality @abstract Hint for the video encoder that it should maximize its speed during encode, sacrificing quality if needed @discussion Video encoders sometimes have a tradeoff available between encoding speed and quality at a given bitrate. For example, by spending more time refining encoding decisions, it may be possible to make marginal improvements on quality. This property lets a client indicate its preference for any such tradeoff. Clients may set this property to kCFBooleanTrue to indicate that the encoder can take steps to maximize its speed by reducing quality, or to kCFBooleanFalse to indicate that the priority should be maximizing quality (at a given bitrate). When the property value is NULL, the video encoder will choose its default behavior. H.264 and HEVC hardware video encoders prioritize quality over speed by default. ProRes hardware encoders currently prioritize speed over quality by default. Not all video encoders support this property. By default, this property is NULL.

func KVTCompressionPropertyKey_ProfileLevel ¶

func KVTCompressionPropertyKey_ProfileLevel() uintptr

@constant kVTCompressionPropertyKey_ProfileLevel @abstract Specifies the profile and level for the encoded bitstream. @discussion Available profiles and levels vary across formats and between video encoders. Video encoders should use standard keys where available, and follow standard patterns where not.

func KVTCompressionPropertyKey_ProgressiveScan ¶

func KVTCompressionPropertyKey_ProgressiveScan() uintptr

@constant kVTCompressionPropertyKey_ProgressiveScan @abstract Indicates that the DV video stream should have the progressive flag set. @discussion This property is supported by the DV25/50 family of encoders. If false, content is encoded as interlaced. If true, content is encoded as progressive. The value of this property fixes the FieldCount and FieldDetail properties.

func KVTCompressionPropertyKey_ProjectionKind ¶

func KVTCompressionPropertyKey_ProjectionKind() uintptr

@constant kVTCompressionPropertyKey_ProjectionKind @abstract Specifies the value of kCMFormatDescriptionExtension_ProjectionKind. @discussion The value will be set on the format description for output samples and may affect the decoded frame presentation.

func KVTCompressionPropertyKey_Quality ¶

func KVTCompressionPropertyKey_Quality() uintptr

@constant kVTCompressionPropertyKey_Quality @abstract The desired compression quality. @discussion Some encoders, such as JPEG, describe the compression level of each image with a quality value. This value should be specified as a number in the range of 0.0 to 1.0, where low = 0.25, normal = 0.50, high = 0.75, and 1.0 implies lossless compression for encoders that support it.

func KVTCompressionPropertyKey_RealTime ¶

func KVTCompressionPropertyKey_RealTime() uintptr

@constant kVTCompressionPropertyKey_RealTime @abstract Hints the video encoder that compression is, or is not, being performed in real time. @discussion For offline compression, clients are advised to set this property to kCFBooleanFalse. This indicates that the timeline of the frames is not connected to wall-clock time at all. This allows the video encoder to run either slower than real-time or faster than real-time, depending upon the situation and device capabilities. For real-time compression, clients are advised to set this property to kCFBooleanTrue. This indicates that the timeline of frames is connected to real time (so, for example, the client expects to encode one second of frames each second, on average). In such a case, it is important that encoding keep up, but it is also not valuable to encode substantially faster than real time. When this property is set to kCFBooleanTrue, the video encoder may use the value of the kVTCompressionPropertyKey_ExpectedFrameRate property to optimize energy usage, by anticipating that encoding requests will happen at this rate. By default, this property is NULL, indicating unknown.

func KVTCompressionPropertyKey_RecommendedParallelizationLimit ¶

func KVTCompressionPropertyKey_RecommendedParallelizationLimit() uintptr

@constant kVTCompressionPropertyKey_RecommendedParallelizationLimit @abstract If supported by the underlying video encoder, returns the recommended number of VTCompressionSessions to instantiate in a parallel encoding configuration. @discussion Parallel encoding VTCompressionSessions require the use of the properties kVTCompressionPropertyKey_MoreFramesBeforeStart, kVTCompressionPropertyKey_MoreFramesAfterEnd, and kVTCompressionPropertyKey_SourceFrameCount. e.g. If the property returns 4, a setup for 4 VTCompressionSessions on a 400 frame movie might look like: compressionSession1 kVTCompressionPropertyKey_MoreFramesBeforeStart = false kVTCompressionPropertyKey_MoreFramesAfterEnd = true kVTCompressionPropertyKey_SourceFrameCount = 100 compressionSession2 kVTCompressionPropertyKey_MoreFramesBeforeStart = true kVTCompressionPropertyKey_MoreFramesAfterEnd = true kVTCompressionPropertyKey_SourceFrameCount = 100 compressionSession3 kVTCompressionPropertyKey_MoreFramesBeforeStart = true kVTCompressionPropertyKey_MoreFramesAfterEnd = true kVTCompressionPropertyKey_SourceFrameCount = 100 compressionSession4 kVTCompressionPropertyKey_MoreFramesBeforeStart = true kVTCompressionPropertyKey_MoreFramesAfterEnd = false kVTCompressionPropertyKey_SourceFrameCount = 100

func KVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumDuration ¶

func KVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumDuration() uintptr

@constant kVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumDuration @abstract If supported by the underlying video encoder, returns the recommended minimum duration for a given subdivision in a parallel encoding configuration. @discussion For best results, ensure that the total duration of a parallelized subdivision is greater than or equal to this returned value. See also kVTCompressionPropertyKey_RecommendedParallelizationLimit See also kVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumFrameCount

func KVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumFrameCount ¶

func KVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumFrameCount() uintptr

@constant kVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumFrameCount @abstract If supported by the underlying video encoder, returns the recommended minimum number of video frames for a given subdivision in a parallel encoding configuration. @discussion For best results, ensure that the total number of frames of a parallelized subdivision is greater than or equal to this returned value. See also kVTCompressionPropertyKey_RecommendedParallelizationLimit See also kVTCompressionPropertyKey_RecommendedParallelizedSubdivisionMinimumDuration

func KVTCompressionPropertyKey_ReferenceBufferCount ¶

func KVTCompressionPropertyKey_ReferenceBufferCount() uintptr

@constant kVTCompressionPropertyKey_ReferenceBufferCount @abstract The client will be able to control the the maximum allowed ReferenceBufferCount using this optional key. @discussion This is typically used to force the encoder to use lower count than allowed by the stantard for a level/profile. The encoder will fail and report an error if the requested value exceeds the limit set by the standard for such a level/profile.

func KVTCompressionPropertyKey_SourceFrameCount ¶

func KVTCompressionPropertyKey_SourceFrameCount() uintptr

@constant kVTCompressionPropertyKey_SourceFrameCount @abstract Indicates the number of source frames, if known. @discussion This property allows a client to give the video encoder advance guidance as to how many frames will be encoded. If nonzero, this should be the exact number of times that the client calls VTCompressionSessionEncodeFrame in each pass. The default is 0, which indicates that the number of source frames is not known.

func KVTCompressionPropertyKey_SpatialAdaptiveQPLevel ¶

func KVTCompressionPropertyKey_SpatialAdaptiveQPLevel() uintptr

@constant kVTCompressionPropertyKey_SpatialAdaptiveQPLevel @abstract Control spatial adaptation of the quantization parameter (QP) based on per-frame statistics. If set to kVTQPModulationLevel_Disable, spatial QP adaptation is not applied based on per-frame statistics. If set to kVTQPModulationLevel_Default, video encoder is allowed to apply spatial QP adaptation for each macro block (or coding unit) within a video frame. QP adaptation is based on spatial characteristics of a frame and the level of spatial QP adaptation is decided internally by the rate controller. @discussion This property must be disabled when low latency rate control is enabled. Support for this property is codec dependent.

func KVTCompressionPropertyKey_StereoCameraBaseline ¶

func KVTCompressionPropertyKey_StereoCameraBaseline() uintptr

@constant kVTCompressionPropertyKey_StereoCameraBaseline @abstract Specifies the value of kCMFormatDescriptionExtension_StereoCameraBaseline. @discussion The value will be set on the format description for output samples and may affect the decoded frame presentation.

func KVTCompressionPropertyKey_SuggestedLookAheadFrameCount ¶

func KVTCompressionPropertyKey_SuggestedLookAheadFrameCount() uintptr

@constant kVTCompressionPropertyKey_SuggestedLookAheadFrameCount @abstract Requests that the encoder retain the specified number of frames during encoding. These frames will be used for additional analysis and statistics gathering before the frame is finally encoded at the end of the window. When this property is not set, video encoder will automatically determine the number of lookahead frames. @discussion Encoder will choose number of lookahead frames closer to the suggested value based on internal configuration. This property directly affects latency of the video encoder. The following properties also affect look ahead frames: 1. Value of this property must be less than or equal to `kVTCompressionPropertyKey_MaxFrameDelayCount`. 2. This property is ignored when `VTVideoEncoderSpecification_EnableLowLatencyRateControl` is set to true 3. This property is ignored when `kVTCompressionPropertyKey_Quality` is set to 1.0 4. This property can not be used in conjunction with multi-pass feature (`kVTCompressionPropertyKey_MultiPassStorage`)

func KVTCompressionPropertyKey_SupportedPresetDictionaries ¶

func KVTCompressionPropertyKey_SupportedPresetDictionaries() uintptr

@constant kVTCompressionPropertyKey_SupportedPresetDictionaries @abstract Where supported by video encoders, returns a dictionary whose keys are the available compression presets (prefixed by `kVTCompressionPreset_`) and the values are dictionaries containing the corresponding settings property key/value pairs. @discussion Clients can select a compression preset for their encoding needs and use its encoder settings to configure the encoder. Clients may also use the encoder settings as a base configuration that they can customize as they require. See also kVTCompressionPreset_HighQuality, kVTCompressionPreset_Balanced, kVTCompressionPreset_HighSpeed, kVTCompressionPreset_VideoConferencing.

func KVTCompressionPropertyKey_SupportsBaseFrameQP ¶

func KVTCompressionPropertyKey_SupportsBaseFrameQP() uintptr

@constant kVTCompressionPropertyKey_SupportsBaseFrameQP @abstract This property can be queried to determine if the encoder supports base frame QP requests. @discussion If this property returns kCFBooleanTrue, it indicates that the encoder supports base frame QP requests through kVTEncodeFrameOptionKey_BaseFrameQP. If it returns false or kVTPropertyNotSupportedErr, base frame QP requests will cause errors on VTCompressionSessionEncodeFrame calls, or will be ignored.

func KVTCompressionPropertyKey_TargetQualityForAlpha ¶

func KVTCompressionPropertyKey_TargetQualityForAlpha() uintptr

@constant kVTCompressionPropertyKey_TargetQualityForAlpha @abstract The target quality to use for encoding the alpha channel. @discussion The desired compression level to use for encoding the alpha channel. This value should be specified as a number in the range of 0.0 to 1.0. 0.0 is lowest quality and 1.0 implies nearly lossless. Alpha plane bit rates will tend to increase with increasing values. When encoding the alpha channel, quality is given priority over bitrate. Note this parameter is currently only applicable to HEVC with Alpha encoders.

func KVTCompressionPropertyKey_TransferFunction ¶

func KVTCompressionPropertyKey_TransferFunction() uintptr

@constant kVTCompressionPropertyKey_TransferFunction @abstract Indicates transfer function for compressed content. @discussion Some video encoders may enforce specific colorimetry; in those cases this property will be read-only (SetProperty will return kVTPropertyReadOnlyErr). The value will be set on the format description for output sample buffers.

func KVTCompressionPropertyKey_UsingGPURegistryID ¶

func KVTCompressionPropertyKey_UsingGPURegistryID() uintptr

@constant kVTCompressionPropertyKey_UsingGPURegistryID @abstract returns CFNumber indicating the gpu registryID of the encoder that was selected. NULL indicates a built-in encoder or software encode was used. @discussion You can query this property using VTSessionCopyProperty after building a VTCompressionSession to find out which GPU the encoder is using. If a encoder based on a built-in GPU was used it will return NULL. If a software encoder is used, it will return NULL

func KVTCompressionPropertyKey_UsingHardwareAcceleratedVideoEncoder ¶

func KVTCompressionPropertyKey_UsingHardwareAcceleratedVideoEncoder() uintptr

@constant kVTCompressionPropertyKey_UsingHardwareAcceleratedVideoEncoder @abstract If set to kCFBooleanTrue, a hardware accelerated video encoder is being used. @discussion You can query this property using VTSessionCopyProperty after you have enabled hardware accelerated encode using kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder to see if a hardware accelerated encoder was selected.

func KVTCompressionPropertyKey_VBVBufferDuration ¶

func KVTCompressionPropertyKey_VBVBufferDuration() uintptr

@constant kVTCompressionPropertyKey_VBVBufferDuration @abstract Capacity of the video buffering verifier (VBV) model in seconds. @discussion VBV model allows for larger variations in bitrates while avoiding decoder-side overflows or underflows. A larger VBV model size may improve compression quality, but it requires more memory and may introduce delay. The value of this property must be greater than 0.0. The default value is set as 2.5 seconds. This property key is compatible with constant bitrate (CBR) or variable bitrate (VBR) rate control. This property key is incompatible with: 1. kVTCompressionPropertyKey_AverageBitRate, 2. kVTCompressionPropertyKey_DataRateLimits, 3. VTVideoEncoderSpecification_EnableLowLatencyRateControl=True.

func KVTCompressionPropertyKey_VBVInitialDelayPercentage ¶

func KVTCompressionPropertyKey_VBVInitialDelayPercentage() uintptr

@constant kVTCompressionPropertyKey_VBVInitialDelayPercentage @abstract Initial delay of the VBV model between storing the picture in the VBV buffer model and decoding of that picture, as a percentage of VBV buffer duration. @discussion This value should be specified as a number in the range of 0 to 100. Larger value increases the delay but results in smoother playback. Default value is 90, meaning 90% of the VBV buffer duration. This property key is incompatible with: 1. kVTCompressionPropertyKey_AverageBitRate, 2. kVTCompressionPropertyKey_DataRateLimits, 3. VTVideoEncoderSpecification_EnableLowLatencyRateControl=True.

func KVTCompressionPropertyKey_VBVMaxBitRate ¶

func KVTCompressionPropertyKey_VBVMaxBitRate() uintptr

@constant kVTCompressionPropertyKey_VBVMaxBitRate @abstract Defines the maximum bitrate that can enter the video buffering verifier (VBV) model at any time in variable bitrate (VBR) mode. @discussion The value of this property must be greater than zero. This property key is not compatible with: 1. kVTCompressionPropertyKey_AverageBitRate, 2. kVTCompressionPropertyKey_ConstantBitRate, 3. kVTCompressionPropertyKey_DataRateLimits, 4. VTVideoEncoderSpecification_EnableLowLatencyRateControl=True.

func KVTCompressionPropertyKey_VariableBitRate ¶

func KVTCompressionPropertyKey_VariableBitRate() uintptr

@constant kVTCompressionPropertyKey_VariableBitRate @abstract Requires that the encoder use a variable bitrate (VBR) rate control algorithm and specifies the desired variable bitrate in bits per second. @discussion The actual peak bitrate present in the bitstream may be above or below this value based on other parameters such as kVTCompressionPropertyKey_VBVMaxBitRate. This property key needs to be set to achieve Variable Bitrate (VBR) rate control. This property key is not compatible with: 1. kVTCompressionPropertyKey_AverageBitRate, 2. kVTCompressionPropertyKey_ConstantBitRate, 3. kVTCompressionPropertyKey_DataRateLimits, 4. VTVideoEncoderSpecification_EnableLowLatencyRateControl = True.

func KVTCompressionPropertyKey_VideoEncoderPixelBufferAttributes ¶

func KVTCompressionPropertyKey_VideoEncoderPixelBufferAttributes() uintptr

@constant kVTCompressionPropertyKey_VideoEncoderPixelBufferAttributes @abstract The video encoder's pixel buffer attributes for the compression session. @discussion You can use these to create a pixel buffer pool for source pixel buffers.

func KVTCompressionPropertyKey_ViewPackingKind ¶

func KVTCompressionPropertyKey_ViewPackingKind() uintptr

@constant kVTCompressionPropertyKey_ViewPackingKind @abstract Specifies the value of kCMFormatDescriptionExtension_ViewPackingKind. @discussion The value will be set on the format description for output samples and may affect the decoded frame presentation.

func KVTCompressionPropertyKey_YCbCrMatrix ¶

func KVTCompressionPropertyKey_YCbCrMatrix() uintptr

@constant kVTCompressionPropertyKey_YCbCrMatrix @abstract Indicates YCbCr matrix for compressed content. @discussion Some video encoders may enforce specific colorimetry; in those cases this property will be read-only (SetProperty will return kVTPropertyReadOnlyErr). The value will be set on the format description for output sample buffers.

func KVTDecodeFrameOptionKey_ContentAnalyzerCropRectangle ¶

func KVTDecodeFrameOptionKey_ContentAnalyzerCropRectangle() uintptr

@constant kVTDecodeFrameOptionKey_ContentAnalyzerCropRectangle @abstract CGRect within the image to be used for content analysis, cropped before applying rotation. @discussion This value specifies a rectangle within the original frame that should be used for content analysis. The cropping is applied before any rotation specified by kVTDecodeFrameOptionKey_ContentAnalyzerRotation. The value should be a CFDictionary representing a CGRect created using CGRectCreateDictionaryRepresentation(). This key is not used unless you have attached a “SCVideoStreamAnalyzer“ to the decompression session.

func KVTDecodeFrameOptionKey_ContentAnalyzerRotation ¶

func KVTDecodeFrameOptionKey_ContentAnalyzerRotation() uintptr

@constant kVTDecodeFrameOptionKey_ContentAnalyzerRotation @abstract Clockwise rotation (one of 0, 90, 180, 270) to be applied for proper display orientation. @discussion This value is used for content analysis to properly orient the image before analysis. The value should be a CFNumber with values of 0, 90, 180, or 270, representing degrees of clockwise rotation. This key is not used unless you have attached a “SCVideoStreamAnalyzer“ to the decompression session.

func KVTDecompressionPropertyKey_AllowBitstreamToChangeFrameDimensions ¶

func KVTDecompressionPropertyKey_AllowBitstreamToChangeFrameDimensions() uintptr

func KVTDecompressionPropertyKey_ContentHasInterframeDependencies ¶

func KVTDecompressionPropertyKey_ContentHasInterframeDependencies() uintptr

@constant kVTDecompressionPropertyKey_ContentHasInterframeDependencies @abstract Indicates whether the content being decoded has interframe dependencies, if the decoder knows. @discussion This is an optional property for video decoders to implement.

func KVTDecompressionPropertyKey_DecoderProducesRAWOutput ¶

func KVTDecompressionPropertyKey_DecoderProducesRAWOutput() uintptr

@constant kVTDecompressionPropertyKey_DecoderProducesRAWOutput @abstract Indicates whether the decoder can produce RAW output requiring a VTRAWProcessingSession for post-decode processing. @discussion If this property is not implemented, it is assumed that the decoder does not produce RAW output. If the decoder reports that it produces RAW output the VTDecompressionSession will internally invoke a VTRAWProcessingSession by default to produce processed output. If the client sets kVTDecompressionPropertyKey_RequestRAWOutput, the VTDecompressionSession will do no processing and return the decoder's native RAW output, and any requested destinationImageBufferAttributes on the VTDecompressionSession will be ignored.

func KVTDecompressionPropertyKey_DeinterlaceMode ¶

func KVTDecompressionPropertyKey_DeinterlaceMode() uintptr

@constant kVTDecompressionPropertyKey_DeinterlaceMode @abstract Requests a specific deinterlacing technique. @discussion This is an optional property for video decoders to implement. Decoders should only accept the modes that they will implement. This property is only applicable if kVTDecompressionPropertyKey_FieldMode is set to kVTDecompressionProperty_FieldMode_DeinterlaceFields.

func KVTDecompressionPropertyKey_FieldMode ¶

func KVTDecompressionPropertyKey_FieldMode() uintptr

@constant kVTDecompressionPropertyKey_FieldMode @abstract Requests special handling of interlaced content. @discussion This is an optional property for video decoders to implement. Decoders should only accept the modes that they will implement.

func KVTDecompressionPropertyKey_GeneratePerFrameHDRDisplayMetadata ¶

func KVTDecompressionPropertyKey_GeneratePerFrameHDRDisplayMetadata() uintptr

@constant kVTDecompressionPropertyKey_GeneratePerFrameHDRDisplayMetadata @abstract Generates Per Frame HDR Metadata and attaches it to the resulting decoded CVPixelBuffers. @discussion If the color space and YCbCrMatrix matches a supported HDR format such as HLG (kCMFormatDescriptionTransferFunction_ITU_R_2100_HLG) the decoded frame will be analyzed and metadata will be added as an attachment to the CVPixelBuffer.

func KVTDecompressionPropertyKey_MaxOutputPresentationTimeStampOfFramesBeingDecoded ¶

func KVTDecompressionPropertyKey_MaxOutputPresentationTimeStampOfFramesBeingDecoded() uintptr

@constant kVTDecompressionPropertyKey_MaxOutputPresentationTimeStampOfFramesBeingDecoded @abstract The maximum output presentation timestamp of the frames currently being decoded. @discussion This may change asynchronously as frames are output.

func KVTDecompressionPropertyKey_MaximizePowerEfficiency ¶

func KVTDecompressionPropertyKey_MaximizePowerEfficiency() uintptr

@constant kVTDecompressionPropertyKey_MaximizePowerEfficiency @abstract Hints to the video decoder that it should maximize power efficiency during decoding. @discussion For decompression where the client is operating in the background, clients may set this property to kCFBooleanTrue, which indicates that the decoder can take steps to minimize impact on power usage and other system activity. Setting the property to NULL is equivalent to setting it to kCFBooleanFalse. Setting both kVTDecompressionPropertyKey_MaximizePowerEfficiency and kVTDecompressionPropertyKey_RealTime is unsupported and results in undefined behavior. Not all video decoders may support this property By default, this property is NULL.

func KVTDecompressionPropertyKey_MinOutputPresentationTimeStampOfFramesBeingDecoded ¶

func KVTDecompressionPropertyKey_MinOutputPresentationTimeStampOfFramesBeingDecoded() uintptr

@constant kVTDecompressionPropertyKey_MinOutputPresentationTimeStampOfFramesBeingDecoded @abstract The minimum output presentation timestamp of the frames currently being decoded. @discussion This may change asynchronously as frames are output.

func KVTDecompressionPropertyKey_NumberOfFramesBeingDecoded ¶

func KVTDecompressionPropertyKey_NumberOfFramesBeingDecoded() uintptr

@constant kVTDecompressionPropertyKey_NumberOfFramesBeingDecoded @abstract Returns the number of frames currently being decoded. @discussion This number may decrease asynchronously as frames are output.

func KVTDecompressionPropertyKey_OnlyTheseFrames ¶

func KVTDecompressionPropertyKey_OnlyTheseFrames() uintptr

@constant kVTDecompressionPropertyKey_OnlyTheseFrames @abstract Requests that frames be filtered by type. @discussion This is an optional property for video decoders to implement. If kVTDecompressionPropertyKey_ReducedFrameDelivery is supported and used in conjunction with this property, the ReducedFrameDelivery is the proportion of the frames selected by this property: 0.25 and IFrames would indicate that only one I frame in every four should be delivered.

func KVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount ¶

func KVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount() uintptr

@constant kVTDecompressionPropertyKey_OutputPoolRequestedMinimumBufferCount @abstract Requests that the VTDecompressionSession use the value provided as a minimum buffer count for its output CVPixelBufferPool, not releasing buffers while the number in use is below this level. @discussion This property effectively requests that the kCVPixelBufferPoolMinimumBufferCountKey key be used for the creation of the output CVPixelBufferPool. For general playback cases, standard CVPixelBufferPool age-out behaviour should be sufficient and this property should not be needed. This property should only be used in unusual playback scenarios where a peak pool level is known, and the potential memory overhead is an acceptable tradeoff for avoiding possible buffer reallocation. Setting this property to NULL or passing in the value 0 will clear this setting and remove the minimum buffer count. Setting this property while a VTDecompressionSession is in use will result in the creation of a new CVPixelBufferPool. This will cause new buffers to be allocated, and existing buffers to be deallocated when they are released.

func KVTDecompressionPropertyKey_PixelBufferPool ¶

func KVTDecompressionPropertyKey_PixelBufferPool() uintptr

@constant kVTDecompressionPropertyKey_PixelBufferPool @abstract A pixel buffer pool for pixel buffers being output by the decompression session. @discussion This pixel buffer pool is always compatible with the client's pixel buffer attributes as specified when calling VTDecompressionSessionCreate.

func KVTDecompressionPropertyKey_PixelBufferPoolIsShared ¶

func KVTDecompressionPropertyKey_PixelBufferPoolIsShared() uintptr

@constant kVTDecompressionPropertyKey_PixelBufferPoolIsShared @abstract Indicates whether a common pixel buffer pool is shared between the video decoder and the session client. @discussion This is false if separate pools are used because the pixel buffer attributes specified by the video decoder and the client were incompatible.

func KVTDecompressionPropertyKey_PixelFormatsWithReducedResolutionSupport ¶

func KVTDecompressionPropertyKey_PixelFormatsWithReducedResolutionSupport() uintptr

@constant kVTDecompressionPropertyKey_PixelFormatsWithReducedResolutionSupport @abstract Indicates which pixel formats support reduced resolution decoding. @discussion This is an optional property for video decoders to implement. This property value is an array containing CFNumbers holding CMPixelFormatType values.

func KVTDecompressionPropertyKey_PixelTransferProperties ¶

func KVTDecompressionPropertyKey_PixelTransferProperties() uintptr

@constant kVTDecompressionPropertyKey_PixelTransferProperties @abstract Requests particular pixel transfer features. @discussion This property is implemented by the video toolbox. This property value is a CFDictionary containing properties from VTPixelTransferProperties.h.

func KVTDecompressionPropertyKey_PropagatePerFrameHDRDisplayMetadata ¶

func KVTDecompressionPropertyKey_PropagatePerFrameHDRDisplayMetadata() uintptr

@constant kVTDecompressionPropertyKey_PropagatePerFrameHDRDisplayMetadata @abstract This controls whether or not to propagate any per frame HDR display metadata from the input compressed bitstream to the output pixel buffer.

func KVTDecompressionPropertyKey_RealTime ¶

func KVTDecompressionPropertyKey_RealTime() uintptr

@constant kVTDecompressionPropertyKey_RealTime @abstract Hints the video decoder that decompression is, or is not, being performed in real time. @discussion For non-realtime decompression, clients may set this property to kCFBooleanFalse, which indicates that it is OK to run this decode pipeline at a lower priority than is used for realtime decode. By default, the VideoToolbox will treat the VTDecompressionSession as though it is being used for realtime playback. Setting the property to NULL is equivalent to setting it to kCFBooleanTrue.

func KVTDecompressionPropertyKey_ReducedCoefficientDecode ¶

func KVTDecompressionPropertyKey_ReducedCoefficientDecode() uintptr

@constant kVTDecompressionPropertyKey_ReducedCoefficientDecode @abstract Requests approximation during decoding. @discussion This is an optional property for video decoders to implement. Only decoders for which such approximations make sense should implement this property. The meaning of the number of coefficients will be decoder-specific.

func KVTDecompressionPropertyKey_ReducedFrameDelivery ¶

func KVTDecompressionPropertyKey_ReducedFrameDelivery() uintptr

@constant kVTDecompressionPropertyKey_ReducedFrameDelivery @abstract Requests frame dropping. @discussion This is an optional property for video decoders to implement. This number is a fraction between 0.0 and 1.0 that indicates what proportion of frames should be delivered -- others may be dropped. For example, 0.25 would indicate that only one frame in every 4 should be delivered. This is a guideline; actual selection of frames is up to the decoder, which will know which frames can be skipped without harm. If the decoder does not support this property directly, but reports that the content has no interframe dependencies, the video toolbox may step in and perform simple frame dropping.

func KVTDecompressionPropertyKey_ReducedResolutionDecode ¶

func KVTDecompressionPropertyKey_ReducedResolutionDecode() uintptr

@constant kVTDecompressionPropertyKey_ReducedResolutionDecode @abstract Requests decoding at a smaller resolution than full-size. @discussion This is an optional property for video decoders to implement. Decoders that only support a fixed set of resolutions should pick the smallest resolution greater than or equal to the requested width x height.

func KVTDecompressionPropertyKey_RequestRAWOutput ¶

func KVTDecompressionPropertyKey_RequestRAWOutput() uintptr

@constant kVTDecompressionPropertyKey_RequestRAWOutput @abstract For decoders which produce RAW output, this property requests that the VTDecompressionSession provide output which has not been processed. @discussion When a decoder produces RAW output (signalled by kVTDecompressionPropertyKey_DecoderProducesRAWOutput) the VTDecompressionSession will automatically invoke a VTRAWProcessingSession with default settings and emit processed frames by default, or when kVTDecompressionPropertyKey_RequestRAWOutput is set to kCFBooleanFalse. If a client wants to run a VTRAWProcessingSession on the RAW output themselves in order to control the post-decode processing of the decoded CVPixelBuffers, they must set kVTDecompressionPropertyKey_RequestRAWOutput to kCFBooleanTrue. If kVTDecompressionPropertyKey_RequestRAWOutput has been enabled and the decoder produces RAW output, the VTDecompressionSession will return CVPixelBuffers in the decoder's native RAW format. Any destinationImageBufferAttributes set on the VTDecompressionSession will be ignored.

func KVTDecompressionPropertyKey_RequestedMVHEVCVideoLayerIDs ¶

func KVTDecompressionPropertyKey_RequestedMVHEVCVideoLayerIDs() uintptr

@constant kVTDecompressionPropertyKey_RequestedMVHEVCVideoLayerIDs @abstract Requests multi-image decoding of specific MV-HEVC VideoLayerIDs. @discussion MV-HEVC specific. Requires that the VTDecompressionSession client use VTDecompressionSessionSetMultiImageCallback to install a callback capable of receiving CMTaggedBufferGroups in response to multi-image DecodeFrame requests. The property value is a CFArray containing VideoLayerIDs as CFNumbers. MV-HEVC VideoLayerIDs not in this list do not need to be output, and the decoder may skip decoding them if not otherwise necessary. The property is NULL by default. If this property is NULL, MV-HEVC shall be decoded ignoring layers other than the base layer. Terminology note: in multi-image decompression, a single video sample (from one CMSampleBuffer) contains a single frame (with one PTS) that is decoded to produce multiple images.

func KVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers ¶

func KVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers() uintptr

@constant kVTDecompressionPropertyKey_SuggestedQualityOfServiceTiers @abstract Suggests how quality-of-service may be lowered in order to maintain realtime playback. @discussion This is an optional property for video decoders to implement. This property value is an array containing either CFDictionaries of property key/value pairs, or the array can contain special key values like kVTDecompressionProperty_TemporalLevelLimit. The first entry in the array should contain the set of properties that restore the default (full) quality of service; later entries should contain property sets with decreasing qualities of service. Clients may work their way down these tiers until they are able to keep up with the frame rate.

func KVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByPerformance ¶

func KVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByPerformance() uintptr

@constant kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByPerformance @abstract Provides hints about speed tradeoffs between pixel formats. @discussion This is an optional property for video decoders to implement. This property value is an array containing CFNumbers holding CMPixelFormatType values, ordered by speed from fast to slow.

func KVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByQuality ¶

func KVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByQuality() uintptr

@constant kVTDecompressionPropertyKey_SupportedPixelFormatsOrderedByQuality @abstract Provides hints about quality tradeoffs between pixel formats. @discussion This is an optional property for video decoders to implement. This property value is an array containing CFNumbers holding CMPixelFormatType values, ordered by quality from best to worse.

func KVTDecompressionPropertyKey_ThreadCount ¶

func KVTDecompressionPropertyKey_ThreadCount() uintptr

@constant kVTDecompressionPropertyKey_ThreadCount @abstract Gets number of threads used by codec or suggests number of threads to use. @discussion This is an optional property for video decoders to implement.

func KVTDecompressionPropertyKey_UsingGPURegistryID ¶

func KVTDecompressionPropertyKey_UsingGPURegistryID() uintptr

@constant kVTDecompressionPropertyKey_UsingGPURegistryID @abstract returns CFNumber indicating the gpu registryID of the decoder that was selected. NULL indicates a built-in decoder or software decode was used. @discussion You can query this property using VTSessionCopyProperty after building a VTDecompressionSession to find out which GPU the decoder is using. If a decoder based on a built-in GPU was used it will return NULL. If a software decoder is used, it will return NULL

func KVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder ¶

func KVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder() uintptr

@constant kVTDecompressionPropertyKey_UsingHardwareAcceleratedVideoDecoder @abstract If set to kCFBooleanTrue, a hardware accelerated video decoder is being used. @discussion You can query this property using VTSessionCopyProperty after you have enabled hardware accelerated decode using kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder to see if a hardware accelerated decoder was selected.

func KVTDecompressionProperty_DeinterlaceMode_Temporal ¶

func KVTDecompressionProperty_DeinterlaceMode_Temporal() uintptr

func KVTDecompressionProperty_DeinterlaceMode_VerticalFilter ¶

func KVTDecompressionProperty_DeinterlaceMode_VerticalFilter() uintptr

func KVTDecompressionProperty_FieldMode_BothFields ¶

func KVTDecompressionProperty_FieldMode_BothFields() uintptr

func KVTDecompressionProperty_FieldMode_BottomFieldOnly ¶

func KVTDecompressionProperty_FieldMode_BottomFieldOnly() uintptr

func KVTDecompressionProperty_FieldMode_DeinterlaceFields ¶

func KVTDecompressionProperty_FieldMode_DeinterlaceFields() uintptr

func KVTDecompressionProperty_FieldMode_SingleField ¶

func KVTDecompressionProperty_FieldMode_SingleField() uintptr

func KVTDecompressionProperty_FieldMode_TopFieldOnly ¶

func KVTDecompressionProperty_FieldMode_TopFieldOnly() uintptr

func KVTDecompressionProperty_OnlyTheseFrames_AllFrames ¶

func KVTDecompressionProperty_OnlyTheseFrames_AllFrames() uintptr

func KVTDecompressionProperty_OnlyTheseFrames_IFrames ¶

func KVTDecompressionProperty_OnlyTheseFrames_IFrames() uintptr

func KVTDecompressionProperty_OnlyTheseFrames_KeyFrames ¶

func KVTDecompressionProperty_OnlyTheseFrames_KeyFrames() uintptr

func KVTDecompressionProperty_OnlyTheseFrames_NonDroppableFrames ¶

func KVTDecompressionProperty_OnlyTheseFrames_NonDroppableFrames() uintptr

func KVTDecompressionProperty_TemporalLevelLimit ¶

func KVTDecompressionProperty_TemporalLevelLimit() uintptr

@constant kVTDecompressionProperty_TemporalLevelLimit @abstract Requests that frames be filtered by temporal level. @discussion This is an optional property for video decoders to implement. If kVTDecompressionProperty_TemporalLevelLimit is supported and the video track is an hierarchical encoding with temporal levels, this property requests that decoding be limited to the specified temporal level and lower. For more information on temporal levels, see kCMSampleAttachmentKey_HEVCTemporalLevelInfo in CoreMedia/CMSampleBuffer.h

func KVTDecompressionResolutionKey_Height ¶

func KVTDecompressionResolutionKey_Height() uintptr

func KVTDecompressionResolutionKey_Width ¶

func KVTDecompressionResolutionKey_Width() uintptr

func KVTDownsamplingMode_Average ¶

func KVTDownsamplingMode_Average() uintptr

func KVTDownsamplingMode_Decimate ¶

func KVTDownsamplingMode_Decimate() uintptr

func KVTEncodeFrameOptionKey_AcknowledgedLTRTokens ¶

func KVTEncodeFrameOptionKey_AcknowledgedLTRTokens() uintptr

@constant kVTEncodeFrameOptionKey_AcknowledgedLTRTokens @abstract A CFArray of CFNumbers containing the kVTSampleAttachmentKey_RequireLTRAcknowledgementToken values which have been successfully sent to the receiver and can be used as references @discussion When an LTR frame is encoded, the encoder will return a unique token for the LTR frame on the output CMSampleBuffer through kVTSampleAttachmentKey_RequireLTRAcknowledgementToken. This token is then returned to the encoder via kVTEncodeFrameOptionKey_AcknowledgedLTRTokens when the LTR frame is received by the remote consumer(s). Also see: kVTCompressionPropertyKey_EnableLTR kVTEncodeFrameOptionKey_ForceLTRRefresh kVTSampleAttachmentKey_RequireLTRAcknowledgementToken

func KVTEncodeFrameOptionKey_BaseFrameQP ¶

func KVTEncodeFrameOptionKey_BaseFrameQP() uintptr

@constant kVTEncodeFrameOptionKey_BaseFrameQP @abstract CFNumberRef requesting the current frame to use the provided base frame QP. @discussion This value is set in the frameProperties CFDictionary passed to VTCompressionSessionEncodeFrame to force the QP value for the current frame. This is an optional parameter. Use it only when you have a specific requirement for the video quality and you are familiar with frame QP and are prepared to assume full responsibility for rate control. Otherwise it is strongly encouraged to rely on the encoder’s rate control for adjusting frame QP. Setting BaseFrameQP turns off standard rate control and will cause the following properties to be ignored:: kVTCompressionPropertyKey_DataRateLimits kVTCompressionPropertyKey_AverageBitRate kVTCompressionPropertyKey_BaseLayerBitRateFraction kVTCompressionPropertyKey_Quality kVTCompressionPropertyKey_MaxAllowedFrameQP kVTCompressionPropertyKey_MinAllowedFrameQP If kVTEncodeFrameOptionKey_BaseFrameQP is used, it must be set for all frames in a session. The QP value specified is frame-level but macro-block level QP may be modulated inside a frame. There will be no rate-control related frame dropping if kVTEncodeFrameOptionKey_BaseFrameQP is used. kVTEncodeFrameOptionKey_BaseFrameQP is only supported if the encoder returns kCFBooleanTrue when the kVTCompressionPropertyKey_SupportsBaseFrameQP is queried. If this FrameOptionKey is set for encoder which does not support it, it will be ignored. Note that it may not be possible for the encoder to accommodate all requests.

func KVTEncodeFrameOptionKey_ForceKeyFrame ¶

func KVTEncodeFrameOptionKey_ForceKeyFrame() uintptr

@constant kVTEncodeFrameOptionKey_ForceKeyFrame @abstract CFBoolean forcing the current frame to be a key frame @discussion This value is set in the frameProperties CFDictionary passed to VTCompressionSessionEncodeFrame to force the current frame to be a keyframe or not. Note that it may not be possible for the encoder to accomodate all requests.

func KVTEncodeFrameOptionKey_ForceLTRRefresh ¶

func KVTEncodeFrameOptionKey_ForceLTRRefresh() uintptr

@constant kVTEncodeFrameOptionKey_ForceLTRRefresh @abstract Set this option to kCFBooleanTrue to force an LTR refresh @discussion When the encoder receives this request on an incoming frame, the encoder will encode a new reference frame using a previously acknowledged LTR, or it will encode a new IDR if no LTR frames have been acknowledged. Also see: kVTCompressionPropertyKey_EnableLTR kVTEncodeFrameOptionKey_AcknowledgedLTRTokens kVTSampleAttachmentKey_RequireLTRAcknowledgementToken

func KVTExtensionProperties_CodecNameKey ¶

func KVTExtensionProperties_CodecNameKey() uintptr

@constant kVTExtensionProperties_CodecNameKey @abstract A CFDictionary key for the user readable name string of the codec. @discussion This key points to a CFStringRef with the name of the codec from the supplied format description. This name will be the one listed in the extension CodecInfo array with the key CodecName.

func KVTExtensionProperties_ContainingBundleNameKey ¶

func KVTExtensionProperties_ContainingBundleNameKey() uintptr

@constant kVTExtensionProperties_ContainingBundleNameKey @abstract A CFDictionary key for the extension host application localized name. @discussion This key points to a CFStringRef value with the localized name of the application hosting the extension.

func KVTExtensionProperties_ContainingBundleURLKey ¶

func KVTExtensionProperties_ContainingBundleURLKey() uintptr

@constant kVTExtensionProperties_ContainingBundleURLKey @abstract A CFDictionary key for the URL of the extension host application. @discussion This key points to a CFURLRef value with the URL of the extension host application.

func KVTExtensionProperties_ExtensionIdentifierKey ¶

func KVTExtensionProperties_ExtensionIdentifierKey() uintptr

@constant kVTExtensionProperties_ExtensionIdentifierKey @abstract A CFDictionary key for the video decoder extension identifier. @discussion This key points to a CFStringRef value with the extension identifier, corresponding to the ClassImplementationID value from the EXAppExtensionAttributes dictionary in the Info.plist file.

func KVTExtensionProperties_ExtensionNameKey ¶

func KVTExtensionProperties_ExtensionNameKey() uintptr

@constant kVTExtensionProperties_ExtensionNameKey @abstract A CFDictionary key for the localized extension name. @discussion This key points to a CFStringRef value with the localized extension name.

func KVTExtensionProperties_ExtensionURLKey ¶

func KVTExtensionProperties_ExtensionURLKey() uintptr

@constant kVTExtensionProperties_ExtensionURLKey @abstract A CFDictionary key for the URL of the extension. @discussion This key points to a CFURLRef value with the URL for the extension.

func KVTH264EntropyMode_CABAC ¶

func KVTH264EntropyMode_CABAC() uintptr

func KVTH264EntropyMode_CAVLC ¶

func KVTH264EntropyMode_CAVLC() uintptr

func KVTHDRMetadataInsertionMode_Auto ¶

func KVTHDRMetadataInsertionMode_Auto() uintptr

func KVTHDRMetadataInsertionMode_None ¶

func KVTHDRMetadataInsertionMode_None() uintptr

func KVTHDRMetadataInsertionMode_RequestSDRRangePreservation ¶

func KVTHDRMetadataInsertionMode_RequestSDRRangePreservation() uintptr

func KVTHDRPerFrameMetadataGenerationHDRFormatType_DolbyVision ¶

func KVTHDRPerFrameMetadataGenerationHDRFormatType_DolbyVision() uintptr

@constant kVTHDRPerFrameMetadataGenerationHDRFormatType_DolbyVision @abstract Specifies that DolbyVision data should be generated and attached for each pixel buffer.

func KVTHDRPerFrameMetadataGenerationOptionsKey_HDRFormats ¶

func KVTHDRPerFrameMetadataGenerationOptionsKey_HDRFormats() uintptr

@constant kVTHDRPerFrameMetadataGenerationOptionsKey_HDRFormats @abstract Specifies an array of HDR formats that should be generated. @discussion This key represents a CFArrayRef. Only one key is supported ( kVTHDRPerFrameMetadataGenerationHDRFormatType_DolbyVision ).

func KVTHeroEye_Left ¶

func KVTHeroEye_Left() uintptr

func KVTHeroEye_Right ¶

func KVTHeroEye_Right() uintptr

func KVTMotionEstimationSessionCreationOption_Label ¶

func KVTMotionEstimationSessionCreationOption_Label() uintptr

A label you use to log and track resources. “VTMotionEstimationSessionCreate“ takes a dictionary of creation options, `motionVectorProcessorSelectionOptions`. You can supply “kVTMotionEstimationSessionCreationOption_Label“ with `CFString` to specify a label used in logging and resource tracking.

func KVTMotionEstimationSessionCreationOption_MotionVectorSize ¶

func KVTMotionEstimationSessionCreationOption_MotionVectorSize() uintptr

The size of the search blocks that motion estimation session uses. “VTMotionEstimationSessionCreate“ takes a dictionary of creation options, `motionVectorProcessorSelectionOptions`. You can supply “kVTMotionEstimationSessionCreationOption_MotionVectorSize“ with `CFNumber` to override the default search block size. Supported motion vector size is 4 or 16, meaning 4x4 or 16x16 respectively. 16x16 is the default if you don't provide this key.

func KVTMotionEstimationSessionCreationOption_UseMultiPassSearch ¶

func KVTMotionEstimationSessionCreationOption_UseMultiPassSearch() uintptr

An option to use for higher quality motion estimation. “VTMotionEstimationSessionCreate“ takes a dictionary of creation options, `motionVectorProcessorSelectionOptions`. You can supply “kVTMotionEstimationSessionCreationOption_UseMultiPassSearch“ with `kCFBooleanTrue` to provide higher quality motion estimation. True-motion achieves higher quality by running the motion estimator in multiple passes. The default is `kCFBooleanFalse`.

func KVTMultiPassStorageCreationOption_DoNotDelete ¶

func KVTMultiPassStorageCreationOption_DoNotDelete() uintptr

func KVTPixelRotationPropertyKey_FlipHorizontalOrientation ¶

func KVTPixelRotationPropertyKey_FlipHorizontalOrientation() uintptr

func KVTPixelRotationPropertyKey_FlipVerticalOrientation ¶

func KVTPixelRotationPropertyKey_FlipVerticalOrientation() uintptr

func KVTPixelRotationPropertyKey_Rotation ¶

func KVTPixelRotationPropertyKey_Rotation() uintptr

func KVTPixelTransferPropertyKey_DestinationCleanAperture ¶

func KVTPixelTransferPropertyKey_DestinationCleanAperture() uintptr

@constant kVTPixelTransferPropertyKey_DestinationCleanAperture @abstract Specifies the clean aperture for destination image buffers. @discussion The value of this property is a CFDictionary with same keys as used in the kCVImageBufferCleanApertureKey dictionary. This property is ignored in kVTScalingMode_Normal. This property defaults to NULL, meaning the clean aperture is the full width and height.

func KVTPixelTransferPropertyKey_DestinationColorPrimaries ¶

func KVTPixelTransferPropertyKey_DestinationColorPrimaries() uintptr

@constant kVTPixelTransferPropertyKey_DestinationColorPrimaries @abstract Specifies the color primaries to be used for destination image buffers. @discussion Specifying this value may lead to performance degradation, as a color matching operation may need to be performed between the source and the destination.

func KVTPixelTransferPropertyKey_DestinationICCProfile ¶

func KVTPixelTransferPropertyKey_DestinationICCProfile() uintptr

@constant kVTPixelTransferPropertyKey_DestinationICCProfile @abstract Specifies the ICC profile for destination image buffers. @discussion Specifying this value may lead to performance degradation, as a color matching operation may need to be performed between the source and the destination.

func KVTPixelTransferPropertyKey_DestinationPixelAspectRatio ¶

func KVTPixelTransferPropertyKey_DestinationPixelAspectRatio() uintptr

@constant kVTPixelTransferPropertyKey_DestinationPixelAspectRatio @abstract Specifies the pixel aspect ratio for destination image buffers. @discussion The value of this property is a CFDictionary with same keys as used in the kCVImageBufferPixelAspectRatioKey dictionary. This property is ignored in kVTScalingMode_Normal. This property defaults to NULL, meaning 1:1 (for kVTScalingMode_CropSourceToCleanAperture) or no change in pixel aspect ratio (for kVTScalingMode_Letterbox and kVTScalingMode_Trim).

func KVTPixelTransferPropertyKey_DestinationTransferFunction ¶

func KVTPixelTransferPropertyKey_DestinationTransferFunction() uintptr

@constant kVTPixelTransferPropertyKey_DestinationTransferFunction @abstract Specifies the color transfer function to be used for destination image buffers. @discussion Specifying this value may lead to performance degradation, as a color matching operation may need to be performed between the source and the destination.

func KVTPixelTransferPropertyKey_DestinationYCbCrMatrix ¶

func KVTPixelTransferPropertyKey_DestinationYCbCrMatrix() uintptr

@constant kVTPixelTransferPropertyKey_DestinationYCbCrMatrix @abstract Specifies the color matrix to be used for YCbCr->RGB conversions involving the destination image buffers. @discussion Specifying this value may lead to performance degradation, as a color matching operation may need to be performed between the source and the destination.

func KVTPixelTransferPropertyKey_DownsamplingMode ¶

func KVTPixelTransferPropertyKey_DownsamplingMode() uintptr

@constant kVTPixelTransferPropertyKey_DownsamplingMode @abstract Requests a specific chroma downsampling technique be used. @discussion This property is ignored if chroma downsampling is not performed.

func KVTPixelTransferPropertyKey_RealTime ¶

func KVTPixelTransferPropertyKey_RealTime() uintptr

@constant kVTPixelTransferPropertyKey_RealTime @abstract Hints the transfer session that the operation is, or is not, being performed in real time. @discussion Set this property to kCFBooleanTrue to indicate that the transfer is part of realtime operation. If set to true, the VTPixelTransferSession may be given precedence over non-realtime tasks. This can be set to false for transfers being performed as part of background operations. By default this value is NULL indicating that it is unspecified.

func KVTPixelTransferPropertyKey_ScalingMode ¶

func KVTPixelTransferPropertyKey_ScalingMode() uintptr

@constant kVTPixelTransferPropertyKey_ScalingMode @abstract Indicates how images should be scaled. @discussion Depending on the scaling mode, scaling may take into account: the full image buffer width and height of the source and destination, the clean aperture attachment (kCVImageBufferCleanApertureKey) on the source image buffer, the pixel aspect ratio attachment (kCVImageBufferPixelAspectRatioKey) on the source image buffer, the destination clean aperture (kVTPixelTransferPropertyKey_DestinationCleanAperture), and/or the destination pixel aspect ratio (kVTPixelTransferPropertyKey_DestinationPixelAspectRatio). The destination image buffer's clean aperture and pixel aspect ratio attachments are not taken into account, and will be overwritten.

func KVTProfileLevel_H263_Profile0_Level10 ¶

func KVTProfileLevel_H263_Profile0_Level10() uintptr

func KVTProfileLevel_H263_Profile0_Level45 ¶

func KVTProfileLevel_H263_Profile0_Level45() uintptr

func KVTProfileLevel_H263_Profile3_Level45 ¶

func KVTProfileLevel_H263_Profile3_Level45() uintptr

func KVTProfileLevel_H264_Baseline_1_3 ¶

func KVTProfileLevel_H264_Baseline_1_3() uintptr

func KVTProfileLevel_H264_Baseline_3_0 ¶

func KVTProfileLevel_H264_Baseline_3_0() uintptr

func KVTProfileLevel_H264_Baseline_3_1 ¶

func KVTProfileLevel_H264_Baseline_3_1() uintptr

func KVTProfileLevel_H264_Baseline_3_2 ¶

func KVTProfileLevel_H264_Baseline_3_2() uintptr

func KVTProfileLevel_H264_Baseline_4_0 ¶

func KVTProfileLevel_H264_Baseline_4_0() uintptr

func KVTProfileLevel_H264_Baseline_4_1 ¶

func KVTProfileLevel_H264_Baseline_4_1() uintptr

func KVTProfileLevel_H264_Baseline_4_2 ¶

func KVTProfileLevel_H264_Baseline_4_2() uintptr

func KVTProfileLevel_H264_Baseline_5_0 ¶

func KVTProfileLevel_H264_Baseline_5_0() uintptr

func KVTProfileLevel_H264_Baseline_5_1 ¶

func KVTProfileLevel_H264_Baseline_5_1() uintptr

func KVTProfileLevel_H264_Baseline_5_2 ¶

func KVTProfileLevel_H264_Baseline_5_2() uintptr

func KVTProfileLevel_H264_Baseline_AutoLevel ¶

func KVTProfileLevel_H264_Baseline_AutoLevel() uintptr

func KVTProfileLevel_H264_ConstrainedBaseline_AutoLevel ¶

func KVTProfileLevel_H264_ConstrainedBaseline_AutoLevel() uintptr

func KVTProfileLevel_H264_ConstrainedHigh_AutoLevel ¶

func KVTProfileLevel_H264_ConstrainedHigh_AutoLevel() uintptr

func KVTProfileLevel_H264_Extended_5_0 ¶

func KVTProfileLevel_H264_Extended_5_0() uintptr

func KVTProfileLevel_H264_Extended_AutoLevel ¶

func KVTProfileLevel_H264_Extended_AutoLevel() uintptr

func KVTProfileLevel_H264_High_3_0 ¶

func KVTProfileLevel_H264_High_3_0() uintptr

func KVTProfileLevel_H264_High_3_1 ¶

func KVTProfileLevel_H264_High_3_1() uintptr

func KVTProfileLevel_H264_High_3_2 ¶

func KVTProfileLevel_H264_High_3_2() uintptr

func KVTProfileLevel_H264_High_4_0 ¶

func KVTProfileLevel_H264_High_4_0() uintptr

func KVTProfileLevel_H264_High_4_1 ¶

func KVTProfileLevel_H264_High_4_1() uintptr

func KVTProfileLevel_H264_High_4_2 ¶

func KVTProfileLevel_H264_High_4_2() uintptr

func KVTProfileLevel_H264_High_5_0 ¶

func KVTProfileLevel_H264_High_5_0() uintptr

func KVTProfileLevel_H264_High_5_1 ¶

func KVTProfileLevel_H264_High_5_1() uintptr

func KVTProfileLevel_H264_High_5_2 ¶

func KVTProfileLevel_H264_High_5_2() uintptr

func KVTProfileLevel_H264_High_AutoLevel ¶

func KVTProfileLevel_H264_High_AutoLevel() uintptr

func KVTProfileLevel_H264_Main_3_0 ¶

func KVTProfileLevel_H264_Main_3_0() uintptr

func KVTProfileLevel_H264_Main_3_1 ¶

func KVTProfileLevel_H264_Main_3_1() uintptr

func KVTProfileLevel_H264_Main_3_2 ¶

func KVTProfileLevel_H264_Main_3_2() uintptr

func KVTProfileLevel_H264_Main_4_0 ¶

func KVTProfileLevel_H264_Main_4_0() uintptr

func KVTProfileLevel_H264_Main_4_1 ¶

func KVTProfileLevel_H264_Main_4_1() uintptr

func KVTProfileLevel_H264_Main_4_2 ¶

func KVTProfileLevel_H264_Main_4_2() uintptr

func KVTProfileLevel_H264_Main_5_0 ¶

func KVTProfileLevel_H264_Main_5_0() uintptr

func KVTProfileLevel_H264_Main_5_1 ¶

func KVTProfileLevel_H264_Main_5_1() uintptr

func KVTProfileLevel_H264_Main_5_2 ¶

func KVTProfileLevel_H264_Main_5_2() uintptr

func KVTProfileLevel_H264_Main_AutoLevel ¶

func KVTProfileLevel_H264_Main_AutoLevel() uintptr

func KVTProfileLevel_HEVC_Main10_AutoLevel ¶

func KVTProfileLevel_HEVC_Main10_AutoLevel() uintptr

func KVTProfileLevel_HEVC_Main42210_AutoLevel ¶

func KVTProfileLevel_HEVC_Main42210_AutoLevel() uintptr

func KVTProfileLevel_HEVC_Main_AutoLevel ¶

func KVTProfileLevel_HEVC_Main_AutoLevel() uintptr

func KVTProfileLevel_HEVC_Monochrome10_AutoLevel ¶

func KVTProfileLevel_HEVC_Monochrome10_AutoLevel() uintptr

func KVTProfileLevel_HEVC_Monochrome_AutoLevel ¶

func KVTProfileLevel_HEVC_Monochrome_AutoLevel() uintptr

func KVTProfileLevel_MP4V_AdvancedSimple_L0 ¶

func KVTProfileLevel_MP4V_AdvancedSimple_L0() uintptr

func KVTProfileLevel_MP4V_AdvancedSimple_L1 ¶

func KVTProfileLevel_MP4V_AdvancedSimple_L1() uintptr

func KVTProfileLevel_MP4V_AdvancedSimple_L2 ¶

func KVTProfileLevel_MP4V_AdvancedSimple_L2() uintptr

func KVTProfileLevel_MP4V_AdvancedSimple_L3 ¶

func KVTProfileLevel_MP4V_AdvancedSimple_L3() uintptr

func KVTProfileLevel_MP4V_AdvancedSimple_L4 ¶

func KVTProfileLevel_MP4V_AdvancedSimple_L4() uintptr

func KVTProfileLevel_MP4V_Main_L2 ¶

func KVTProfileLevel_MP4V_Main_L2() uintptr

func KVTProfileLevel_MP4V_Main_L3 ¶

func KVTProfileLevel_MP4V_Main_L3() uintptr

func KVTProfileLevel_MP4V_Main_L4 ¶

func KVTProfileLevel_MP4V_Main_L4() uintptr

func KVTProfileLevel_MP4V_Simple_L0 ¶

func KVTProfileLevel_MP4V_Simple_L0() uintptr

func KVTProfileLevel_MP4V_Simple_L1 ¶

func KVTProfileLevel_MP4V_Simple_L1() uintptr

func KVTProfileLevel_MP4V_Simple_L2 ¶

func KVTProfileLevel_MP4V_Simple_L2() uintptr

func KVTProfileLevel_MP4V_Simple_L3 ¶

func KVTProfileLevel_MP4V_Simple_L3() uintptr

func KVTProjectionKind_Equirectangular ¶

func KVTProjectionKind_Equirectangular() uintptr

func KVTProjectionKind_HalfEquirectangular ¶

func KVTProjectionKind_HalfEquirectangular() uintptr

func KVTProjectionKind_ParametricImmersive ¶

func KVTProjectionKind_ParametricImmersive() uintptr

func KVTProjectionKind_Rectilinear ¶

func KVTProjectionKind_Rectilinear() uintptr

func KVTPropertyDocumentationKey ¶

func KVTPropertyDocumentationKey() uintptr

func KVTPropertyReadWriteStatusKey ¶

func KVTPropertyReadWriteStatusKey() uintptr

func KVTPropertyReadWriteStatus_ReadOnly ¶

func KVTPropertyReadWriteStatus_ReadOnly() uintptr

func KVTPropertyReadWriteStatus_ReadWrite ¶

func KVTPropertyReadWriteStatus_ReadWrite() uintptr

func KVTPropertyShouldBeSerializedKey ¶

func KVTPropertyShouldBeSerializedKey() uintptr

func KVTPropertySupportedValueListKey ¶

func KVTPropertySupportedValueListKey() uintptr

func KVTPropertySupportedValueMaximumKey ¶

func KVTPropertySupportedValueMaximumKey() uintptr

func KVTPropertySupportedValueMinimumKey ¶

func KVTPropertySupportedValueMinimumKey() uintptr

func KVTPropertyTypeKey ¶

func KVTPropertyTypeKey() uintptr

func KVTPropertyType_Boolean ¶

func KVTPropertyType_Boolean() uintptr

func KVTPropertyType_Enumeration ¶

func KVTPropertyType_Enumeration() uintptr

func KVTPropertyType_Number ¶

func KVTPropertyType_Number() uintptr

func KVTRAWProcessingParameterListElement_Description ¶

func KVTRAWProcessingParameterListElement_Description() uintptr

func KVTRAWProcessingParameterListElement_Label ¶

func KVTRAWProcessingParameterListElement_Label() uintptr

func KVTRAWProcessingParameterListElement_ListElementID ¶

func KVTRAWProcessingParameterListElement_ListElementID() uintptr

func KVTRAWProcessingParameterValueType_Boolean ¶

func KVTRAWProcessingParameterValueType_Boolean() uintptr

func KVTRAWProcessingParameterValueType_Float ¶

func KVTRAWProcessingParameterValueType_Float() uintptr

func KVTRAWProcessingParameterValueType_Integer ¶

func KVTRAWProcessingParameterValueType_Integer() uintptr

func KVTRAWProcessingParameterValueType_List ¶

func KVTRAWProcessingParameterValueType_List() uintptr

func KVTRAWProcessingParameterValueType_SubGroup ¶

func KVTRAWProcessingParameterValueType_SubGroup() uintptr

func KVTRAWProcessingParameter_CameraValue ¶

func KVTRAWProcessingParameter_CameraValue() uintptr

@constant kVTRAWProcessingParameter_CameraValue @discussion The value corresponding to this key is the "As Shot" value for this parameter as originally captured by the camera. For List types, this is the ListElementID for the List element.

func KVTRAWProcessingParameter_CurrentValue ¶

func KVTRAWProcessingParameter_CurrentValue() uintptr

@constant kVTRAWProcessingParameter_CurrentValue @discussion The value corresponding to this key is the currently configured value for this parameter. For List types, this is the ListElementID for the List element.

func KVTRAWProcessingParameter_Description ¶

func KVTRAWProcessingParameter_Description() uintptr

@constant kVTRAWProcessingParameter_Description @discussion The value corresponding to this key is a localized string with a description of the parameter suitable for display in a tooltip or other descriptive UI.

func KVTRAWProcessingParameter_Enabled ¶

func KVTRAWProcessingParameter_Enabled() uintptr

@constant kVTRAWProcessingParameter_Enabled @discussion The value corresponding to this key is Boolean indicating whether the parameter is enabled and can be modified.

func KVTRAWProcessingParameter_InitialValue ¶

func KVTRAWProcessingParameter_InitialValue() uintptr

@constant kVTRAWProcessingParameter_InitialValue @discussion The value corresponding to this key is the initial value for this parameter as defined by the container and metadata provided at creation time. For List types, this is the ListElementID for the List element.

func KVTRAWProcessingParameter_Key ¶

func KVTRAWProcessingParameter_Key() uintptr

@constant kVTRAWProcessingParameter_Key @discussion The value corresponding to this key is the string used when specifying this parameter when calling VTRAWProcessingSessionSetProcessingParameters.

func KVTRAWProcessingParameter_ListArray ¶

func KVTRAWProcessingParameter_ListArray() uintptr

@constant kVTRAWProcessingParameter_ListArray @discussion The value corresponding to this key is a CFArray of CFDictionaries describing each element in the list..

func KVTRAWProcessingParameter_MaximumValue ¶

func KVTRAWProcessingParameter_MaximumValue() uintptr

@constant kVTRAWProcessingParameter_MaximumValue @discussion The value corresponding to this key is the maximum value allowed for this parameter when calling VTRAWProcessingSessionSetProcessingParameters. This parameter is optional and not required for parameters where it is not appropriate (such as Boolean or List types).

func KVTRAWProcessingParameter_MinimumValue ¶

func KVTRAWProcessingParameter_MinimumValue() uintptr

@constant kVTRAWProcessingParameter_MinimumValue @discussion The value corresponding to this key is the minimum value allowed for this parameter when calling VTRAWProcessingSessionSetProcessingParameters. This parameter is optional and not required for parameters where it is not appropriate (such as Boolean or List types).

func KVTRAWProcessingParameter_Name ¶

func KVTRAWProcessingParameter_Name() uintptr

@constant kVTRAWProcessingParameter_Name @discussion The value corresponding to this key is a localized string which can be displayed in UI representing this parameter.

func KVTRAWProcessingParameter_NeutralValue ¶

func KVTRAWProcessingParameter_NeutralValue() uintptr

@constant kVTRAWProcessingParameter_NeutralValue @discussion The value corresponding to this key is a neutral setting for the processor. For List types, this is the ListElementID for the List element.

func KVTRAWProcessingParameter_SubGroup ¶

func KVTRAWProcessingParameter_SubGroup() uintptr

@constant kVTRAWProcessingParameter_SubGroup @discussion The value corresponding to this key is a CFArray of CFDictionaries representing the individual sub-parameters in this group.

func KVTRAWProcessingParameter_ValueType ¶

func KVTRAWProcessingParameter_ValueType() uintptr

@constant kVTRAWProcessingParameter_ValueType @discussion The value corresponding to this key is the type of the parameter - a Boolean, Integer, Float, List, or SubGroup.

func KVTRAWProcessingPropertyKey_MetadataForSidecarFile ¶

func KVTRAWProcessingPropertyKey_MetadataForSidecarFile() uintptr

@constant kVTRAWProcessingPropertyKey_MetadataForSidecarFile @abstract This property, if supported, returns the current processing metadata on the RAW Processor. The returned value can be used by the caller to create, or overwrite an existing sidecar file. @discussion This property is not supported by all RAWProcessors. The metadata returned represents a fully-formed sidecar file, and should be compatible with the MediaExtension FormatReader.

func KVTRAWProcessingPropertyKey_MetalDeviceRegistryID ¶

func KVTRAWProcessingPropertyKey_MetalDeviceRegistryID() uintptr

@constant kVTRAWProcessingPropertyKey_MetalDeviceRegistryID @abstract This property, if supported, requests that the Metal device corresponding to the specified registryID be used for any Metal related processing @discussion This property is not supported by all RAWProcessors

func KVTRAWProcessingPropertyKey_OutputColorAttachments ¶

func KVTRAWProcessingPropertyKey_OutputColorAttachments() uintptr

@constant kVTRAWProcessingPropertyKey_OutputColorAttachments @abstract Returns the color-related CVImageBuffer keys and values that will be attachments to the returned pixel buffers. @discussion This property may not be supported by all RAW Processors. Only color-related keys from CVImageBuffer.h are permitted in the returned dictionary.

func KVTRotation_0 ¶

func KVTRotation_0() uintptr

func KVTRotation_180 ¶

func KVTRotation_180() uintptr

func KVTRotation_CCW90 ¶

func KVTRotation_CCW90() uintptr

func KVTRotation_CW90 ¶

func KVTRotation_CW90() uintptr

func KVTSampleAttachmentKey_QualityMetrics ¶

func KVTSampleAttachmentKey_QualityMetrics() uintptr

@constant kVTSampleAttachmentKey_QualityMetrics @abstract The value for this key contain quality-related metadata from the video encoder for a video frame. @discussion The video encoder will attach this via the CMSampleBufferGetSampleAttachmentsArray interface before emitting the sample buffer.

func KVTSampleAttachmentKey_RequireLTRAcknowledgementToken ¶

func KVTSampleAttachmentKey_RequireLTRAcknowledgementToken() uintptr

@constant kVTSampleAttachmentKey_RequireLTRAcknowledgementToken @abstract CFNumber containing a unique token for this LTR @discussion This CMSampleBuffer attachment contains a unique token which can be returned to the encoder through kVTEncodeFrameOptionKey_AcknowledgedLTRTokens to indicate that the LTR has been received and may be used as a reference. Also see: kVTCompressionPropertyKey_EnableLTR kVTEncodeFrameOptionKey_AcknowledgedLTRTokens kVTEncodeFrameOptionKey_ForceLTRRefresh

func KVTSampleAttachmentQualityMetricsKey_ChromaBlueMeanSquaredError ¶

func KVTSampleAttachmentQualityMetricsKey_ChromaBlueMeanSquaredError() uintptr

@constant kVTSampleAttachmentQualityMetricsKey_ChromaBlueMeanSquaredError @abstract Key for mean squared error (MSE) of the encoded Chroma Blue channel from the video encoder. @discussion For single-view video, a CFNumber value is returned. For multi-view video, a CFArray value is returned, and each element (CFNumber) in the CFArray includes MSE for the corresponding view. The video encoder will attach this in kVTSampleAttachmentKey_QualityMetrics via the CMSampleBufferGetSampleAttachmentsArray interface before emitting the sample buffer.

func KVTSampleAttachmentQualityMetricsKey_ChromaRedMeanSquaredError ¶

func KVTSampleAttachmentQualityMetricsKey_ChromaRedMeanSquaredError() uintptr

@constant kVTSampleAttachmentQualityMetricsKey_ChromaRedMeanSquaredError @abstract Key for mean squared error (MSE) of the encoded Chroma Red channel from the video encoder. @discussion For single-view video, a CFNumber value is returned. For multi-view video, a CFArray value is returned, and each element (CFNumber) in the CFArray includes MSE for the corresponding view. The video encoder will attach this in kVTSampleAttachmentKey_QualityMetrics via the CMSampleBufferGetSampleAttachmentsArray interface before emitting the sample buffer.

func KVTSampleAttachmentQualityMetricsKey_LumaMeanSquaredError ¶

func KVTSampleAttachmentQualityMetricsKey_LumaMeanSquaredError() uintptr

@constant kVTSampleAttachmentQualityMetricsKey_LumaMeanSquaredError @abstract Key for mean squared error (MSE) of the encoded Luma channel from the video encoder. @discussion For single-view video, a CFNumber value is returned. For multi-view video, a CFArray value is returned, and each element (CFNumber) in the CFArray includes MSE for the corresponding view. The video encoder will attach this in kVTSampleAttachmentKey_QualityMetrics via the CMSampleBufferGetSampleAttachmentsArray interface before emitting the sample buffer.

func KVTScalingMode_CropSourceToCleanAperture ¶

func KVTScalingMode_CropSourceToCleanAperture() uintptr

func KVTScalingMode_Letterbox ¶

func KVTScalingMode_Letterbox() uintptr

func KVTScalingMode_Normal ¶

func KVTScalingMode_Normal() uintptr

func KVTScalingMode_Trim ¶

func KVTScalingMode_Trim() uintptr

func KVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder ¶

func KVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder() uintptr

@constant kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder @abstract If set to kCFBooleanTrue, the VideoToolbox will use a hardware accelerated video decoder if available. If set to kCFBooleanFalse, hardware decode will never be used. @discussion This key is set in the decoderSpecification passed in to VTDecompressionSessionCreate. Set it to kCFBooleanTrue to allow hardware accelerated decode. To prevent hardware decode, this property can be set to kCFBooleanFalse. In MacOS 10.15 and later, hardware decode is enabled in VTDecompressionSessions by default.

func KVTVideoDecoderSpecification_PreferredDecoderGPURegistryID ¶

func KVTVideoDecoderSpecification_PreferredDecoderGPURegistryID() uintptr

@constant kVTVideoDecoderSpecification_PreferredDecoderGPURegistryID @abstract If set, the VideoToolbox will try to use a hardware decoder running on the GPU specified by the provided GPU registryID. If the GPU does not support decode of the specified format, the VideoToolbox will fall back to alternate decoders. @discussion This specification implies kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder. A separate hardware decode opt-in is not required. If both kVTVideoDecoderSpecification_PreferredDecoderGPURegistryID and kVTVideoDecoderSpecification_RequiredDecoderGPURegistryID are set, kVTVideoDecoderSpecification_PreferredDecoderGPURegistryID will be ignored. This specification can be used in conjunction with kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder to prevent a fallback to software decode. The GPU registryID can be obtained from a MTLDevice using [MTLDevice registryID] or can be obtained from OpenGL or OpenCL. This option can only be used to specify a GPU registryID corresponding to a removable GPU (eGPU).

func KVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder ¶

func KVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder() uintptr

@constant kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder @abstract If set to kCFBooleanTrue, the VideoToolbox will try to allocate a hardware accelerated decoder and return an error if that isn't possible. Setting this key automatically implies kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder -- there is no need to set both and the Enable key does nothing if the Require key is set. @discussion This key is set in the decoderSpecification passed in to VTDecompressionSessionCreate. Set it to kCFBooleanTrue to require hardware accelerated decode. If hardware acceleration is not possible, the VTDecompressionSessionCreate call will fail. This key is useful for clients that have their own software decode implementation or those that may want to configure software and hardware decode sessions differently. Hardware acceleration may be unavailable for a number of reasons. A few common cases are: - the machine does not have hardware acceleration capabilities - the requested decoding format or configuration is not supported - the hardware decode resources on the machine are busy

func KVTVideoDecoderSpecification_RequiredDecoderGPURegistryID ¶

func KVTVideoDecoderSpecification_RequiredDecoderGPURegistryID() uintptr

@constant kVTVideoDecoderSpecification_RequiredDecoderGPURegistryID @abstract If set, the VideoToolbox will only use a hardware decoder running on the GPU specified by the provided GPU registryID. @discussion This specification implies kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder. A separate hardware decode opt-in is not required. The GPU registryID can be obtained from a MTLDevice using [MTLDevice registryID] or can be obtained from OpenGL or OpenCL. This option can only be used to specify a GPU registryID corresponding to a removable GPU (eGPU). If 0 is specified for the required GPU registryID, the VideoToolbox will not utilize removable GPUs for decode.

func KVTVideoEncoderListOption_IncludeStandardDefinitionDVEncoders ¶

func KVTVideoEncoderListOption_IncludeStandardDefinitionDVEncoders() uintptr

func KVTVideoEncoderList_CodecName ¶

func KVTVideoEncoderList_CodecName() uintptr

func KVTVideoEncoderList_CodecType ¶

func KVTVideoEncoderList_CodecType() uintptr

func KVTVideoEncoderList_DisplayName ¶

func KVTVideoEncoderList_DisplayName() uintptr

func KVTVideoEncoderList_EncoderID ¶

func KVTVideoEncoderList_EncoderID() uintptr

func KVTVideoEncoderList_EncoderName ¶

func KVTVideoEncoderList_EncoderName() uintptr

func KVTVideoEncoderList_GPURegistryID ¶

func KVTVideoEncoderList_GPURegistryID() uintptr

func KVTVideoEncoderList_InstanceLimit ¶

func KVTVideoEncoderList_InstanceLimit() uintptr

func KVTVideoEncoderList_IsHardwareAccelerated ¶

func KVTVideoEncoderList_IsHardwareAccelerated() uintptr

func KVTVideoEncoderList_PerformanceRating ¶

func KVTVideoEncoderList_PerformanceRating() uintptr

func KVTVideoEncoderList_QualityRating ¶

func KVTVideoEncoderList_QualityRating() uintptr

func KVTVideoEncoderList_SupportedSelectionProperties ¶

func KVTVideoEncoderList_SupportedSelectionProperties() uintptr

func KVTVideoEncoderList_SupportsFrameReordering ¶

func KVTVideoEncoderList_SupportsFrameReordering() uintptr

func KVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder ¶

func KVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder() uintptr

@constant kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder @abstract If set to kCFBooleanTrue, use a hardware accelerated video encoder if available. If set to kCFBooleanFalse, hardware encode will never be used. @discussion This key is set in the encoderSpecification passed in to VTCompressionSessionCreate. Set it to kCFBooleanTrue to allow hardware accelerated encode. To prevent hardware encode, this property can be set to kCFBooleanFalse. In MacOS 10.15 and later, hardware encode is enabled in VTCompressionSessions by default.

func KVTVideoEncoderSpecification_EnableLowLatencyRateControl ¶

func KVTVideoEncoderSpecification_EnableLowLatencyRateControl() uintptr

@constant kVTVideoEncoderSpecification_EnableLowLatencyRateControl @abstract Requires that an encoder which supports low-latency operation be selected, and enables low-latency mode. @discussion Low latency RateControl enforces the following behaviors: - Infinite GOP (all P frames following the beginning IDR). - No frame reordering (B frame) or looking ahead. - Only High profiles. Levels are left for the encoder to automatically set. - Temporal Layer structure. Also see: kVTCompressionPropertyKey_AverageBitRate kVTCompressionPropertyKey_BaseLayerFrameRateFraction kVTEncodeFrameOptionKey_ForceKeyFrame

func KVTVideoEncoderSpecification_EncoderID ¶

func KVTVideoEncoderSpecification_EncoderID() uintptr

@constant kVTVideoEncoderSpecification_EncoderID @abstract Specifies a particular video encoder by its ID string. @discussion To specify a particular video encoder when creating a compression session, pass an encoderSpecification CFDictionary containing this key and the EncoderID as its value. The EncoderID CFString may be obtained from the kVTVideoEncoderList_EncoderID entry in the array returned by VTCopyVideoEncoderList.

func KVTVideoEncoderSpecification_PreferredEncoderGPURegistryID ¶

func KVTVideoEncoderSpecification_PreferredEncoderGPURegistryID() uintptr

@constant kVTVideoEncoderSpecification_PreferredEncoderGPURegistryID @abstract If set, the VideoToolbox will try to use a hardware encoder running on the GPU specified by the provided GPU registryID. If the GPU does not support encode of the specified format, the VideoToolbox will fall back to alternate encoders. @discussion This specification implies kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder. A separate hardware encode opt-in is not required. If both kVTVideoEncoderSpecification_PreferredEncoderGPURegistryID and kVTVideoEncoderSpecification_RequiredEncoderGPURegistryID are set, kVTVideoEncoderSpecification_PreferredEncoderGPURegistryID will be ignored. This specification can be used in conjunction with kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder to prevent a fallback to software encode. The GPU registryID can be obtained from a MTLDevice using [MTLDevice registryID] or can be obtained from OpenGL or OpenCL.

func KVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder ¶

func KVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder() uintptr

@constant kVTVideoEncoderSpecification_RequireHardwareAcceleratedVideoEncoder @abstract If set to kCFBooleanTrue, only use hardware encode and return an error if this isn't possible. Setting this key automatically implies kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder -- there is no need to set both and the Enable key does nothing if the Require key is set. @discussion This key is set in the encoderSpecification passed in to VTCompressionSessionCreate. Set it to kCFBooleanTrue to require hardware accelerated encode. If hardware acceleration is not possible, the VTCompressionSessionCreate call will fail. This key is useful for clients that have their own software encode implementation or those that may want to configure software and hardware encode sessions differently. Hardware acceleration may be unavailable for a number of reasons. A few common cases are: - the machine does not have hardware acceleration capabilities - the requested encoding format or encoding configuration is not supported - the hardware encoding resources on the machine are busy

func KVTVideoEncoderSpecification_RequiredEncoderGPURegistryID ¶

func KVTVideoEncoderSpecification_RequiredEncoderGPURegistryID() uintptr

@constant kVTVideoEncoderSpecification_RequiredEncoderGPURegistryID @abstract If set, the VideoToolbox will only use a hardware encoder running on the GPU specified by the provided GPU registryID. @discussion This specification implies kVTVideoEncoderSpecification_EnableHardwareAcceleratedVideoEncoder. A separate hardware encode opt-in is not required. The GPU registryID can be obtained from a MTLDevice using [MTLDevice registryID] or can be obtained from OpenGL or OpenCL.

func KVTViewPackingKind_OverUnder ¶

func KVTViewPackingKind_OverUnder() uintptr

func KVTViewPackingKind_SideBySide ¶

func KVTViewPackingKind_SideBySide() uintptr

func SymbolAvailable ¶

func SymbolAvailable(symbol string) bool

SymbolAvailable reports whether the named C symbol was bound when the library loaded. Calling a generated wrapper whose symbol is unavailable dereferences a nil function variable and panics.

func VTCompressionSessionBeginPass ¶

func VTCompressionSessionBeginPass(session unsafe.Pointer, beginPassFlags VTCompressionSessionOptionFlags, reserved *uint32) int

func VTCompressionSessionCompleteFrames ¶

func VTCompressionSessionCompleteFrames(session unsafe.Pointer, completeUntilPresentationTimeStamp coremedia.CMTime) int

func VTCompressionSessionCreate ¶

func VTCompressionSessionCreate(allocator unsafe.Pointer, width int32, height int32, codecType uint, encoderSpecification unsafe.Pointer, sourceImageBufferAttributes unsafe.Pointer, compressedDataAllocator unsafe.Pointer, outputCallback unsafe.Pointer, outputCallbackRefCon unsafe.Pointer, compressionSessionOut unsafe.Pointer) int

func VTCompressionSessionEncodeFrame ¶

func VTCompressionSessionEncodeFrame(session unsafe.Pointer, imageBuffer unsafe.Pointer, presentationTimeStamp coremedia.CMTime, duration coremedia.CMTime, frameProperties unsafe.Pointer, sourceFrameRefcon unsafe.Pointer, infoFlagsOut *VTEncodeInfoFlags) int

func VTCompressionSessionEncodeFrameWithOutputHandler ¶

func VTCompressionSessionEncodeFrameWithOutputHandler(session unsafe.Pointer, imageBuffer unsafe.Pointer, presentationTimeStamp coremedia.CMTime, duration coremedia.CMTime, frameProperties unsafe.Pointer, infoFlagsOut *VTEncodeInfoFlags, outputHandler func(int, VTEncodeInfoFlags, unsafe.Pointer)) int

func VTCompressionSessionEncodeMultiImageFrame ¶

func VTCompressionSessionEncodeMultiImageFrame(session unsafe.Pointer, taggedBufferGroup unsafe.Pointer, presentationTimeStamp coremedia.CMTime, duration coremedia.CMTime, frameProperties unsafe.Pointer, sourceFrameRefcon unsafe.Pointer, infoFlagsOut *VTEncodeInfoFlags) int

func VTCompressionSessionEncodeMultiImageFrameWithOutputHandler ¶

func VTCompressionSessionEncodeMultiImageFrameWithOutputHandler(session unsafe.Pointer, taggedBufferGroup unsafe.Pointer, presentationTimeStamp coremedia.CMTime, duration coremedia.CMTime, frameProperties unsafe.Pointer, infoFlagsOut *VTEncodeInfoFlags, outputHandler func(int, VTEncodeInfoFlags, unsafe.Pointer)) int

func VTCompressionSessionEndPass ¶

func VTCompressionSessionEndPass(session unsafe.Pointer, furtherPassesRequestedOut *uint8, reserved *uint32) int

func VTCompressionSessionGetPixelBufferPool ¶

func VTCompressionSessionGetPixelBufferPool(session unsafe.Pointer) unsafe.Pointer

func VTCompressionSessionGetTimeRangesForNextPass ¶

func VTCompressionSessionGetTimeRangesForNextPass(session unsafe.Pointer, timeRangeCountOut *int, timeRangeArrayOut *coremedia.CMTimeRange) int

func VTCompressionSessionGetTypeID ¶

func VTCompressionSessionGetTypeID() uint

func VTCompressionSessionInvalidate ¶

func VTCompressionSessionInvalidate(session unsafe.Pointer)

func VTCompressionSessionPrepareToEncodeFrames ¶

func VTCompressionSessionPrepareToEncodeFrames(session unsafe.Pointer) int

func VTCopyRAWProcessorExtensionProperties ¶

func VTCopyRAWProcessorExtensionProperties(formatDesc unsafe.Pointer, mediaExtensionPropertiesOut unsafe.Pointer) int

@function VTCopyRAWProcessorExtensionProperties @abstract Returns information about the Media Extension RAW processor supporting the specified format. @discussion If a Media Extension RAW processor will be used to process the specified format, this function will return information about the Media Extension that will be used. @param formatDesc The format description for the video format for which information is being requested. @param mediaExtensionPropertiesOut If a Media Extension RAW processor will be used to process the specified format, this pointer will return a dictionary with a set of properties describing the extension RAW processor. The dictionary keys VTExtensionPropertiesKey values. @result If the function succeeds and a Media Extension RAW processor will be used to process this format, the return value will be noErr. If the function succeeds but a Media Extension RAW processor will not be used to process this format, the return value will be kVTCouldNotFindExtensionErr. If a Media Extension RAW processor for the format was found but is disabled, the function will return kVTExtensionDisabledErr. Otherwise, the return value will be an error code describing the failure.

func VTCopySupportedPropertyDictionaryForEncoder ¶

func VTCopySupportedPropertyDictionaryForEncoder(width int32, height int32, codecType uint, encoderSpecification unsafe.Pointer, encoderIDOut unsafe.Pointer, supportedPropertiesOut unsafe.Pointer) int

@function VTCopySupportedPropertyDictionaryForEncoder @abstract Builds a list of supported properties and encoder ID for an encoder @discussion The caller must CFRelease the returned supported properties and encoder ID.

func VTCopyVideoDecoderExtensionProperties ¶

func VTCopyVideoDecoderExtensionProperties(formatDesc unsafe.Pointer, mediaExtensionPropertiesOut unsafe.Pointer) int

@function VTCopyVideoDecoderExtensionProperties @abstract Returns information about the Media Extension video decoder required to decode the specified format. @discussion If a Media Extension video decoder will be used to decode the specified format, this function will return information about the Media Extension that will be used. @param formatDesc The format description for the video format for which information is being requested. @param mediaExtensionPropertiesOut If a Media Extension video decoder will be used to decode the specified format, this pointer will return a dictionary with a set of properties describing the extension video decoder. The dictionary keys are VTExtensionPropertiesKey values. @result If the function succeeds and a Media Extension video decoder will be used to decode this format, the return value will be noErr. If the function succeeds but a Media Extension video decoder will not be used to decode this format, the return value will be kVTCouldNotFindExtensionErr. If a Media Extension video decoder for the format was found but is disabled, the function will return kVTExtensionDisabledErr. Otherwise, the return value will be an error code describing the failure.

func VTCopyVideoEncoderList ¶

func VTCopyVideoEncoderList(options unsafe.Pointer, listOfVideoEncodersOut unsafe.Pointer) int

@function VTCopyVideoEncoderList @abstract Builds a list of available video encoders. @discussion The caller must CFRelease the returned list.

func VTCreateCGImageFromCVPixelBuffer ¶

func VTCreateCGImageFromCVPixelBuffer(pixelBuffer unsafe.Pointer, options unsafe.Pointer, imageOut unsafe.Pointer) int

func VTDecompressionSessionCanAcceptFormatDescription ¶

func VTDecompressionSessionCanAcceptFormatDescription(session unsafe.Pointer, newFormatDesc unsafe.Pointer) uint8

func VTDecompressionSessionCopyBlackPixelBuffer ¶

func VTDecompressionSessionCopyBlackPixelBuffer(session unsafe.Pointer, pixelBufferOut unsafe.Pointer) int

func VTDecompressionSessionCreate ¶

func VTDecompressionSessionCreate(allocator unsafe.Pointer, videoFormatDescription unsafe.Pointer, videoDecoderSpecification unsafe.Pointer, destinationImageBufferAttributes unsafe.Pointer, outputCallback *VTDecompressionOutputCallbackRecord, decompressionSessionOut unsafe.Pointer) int

func VTDecompressionSessionDecodeFrame ¶

func VTDecompressionSessionDecodeFrame(session unsafe.Pointer, sampleBuffer unsafe.Pointer, decodeFlags VTDecodeFrameFlags, sourceFrameRefCon unsafe.Pointer, infoFlagsOut *VTDecodeInfoFlags) int

func VTDecompressionSessionDecodeFrameWithMultiImageCapableOutputHandler ¶

func VTDecompressionSessionDecodeFrameWithMultiImageCapableOutputHandler(session unsafe.Pointer, sampleBuffer unsafe.Pointer, decodeFlags VTDecodeFrameFlags, infoFlagsOut *VTDecodeInfoFlags, multiImageCapableOutputHandler objc.Block) int

func VTDecompressionSessionDecodeFrameWithOptions ¶

func VTDecompressionSessionDecodeFrameWithOptions(session unsafe.Pointer, sampleBuffer unsafe.Pointer, decodeFlags VTDecodeFrameFlags, frameOptions unsafe.Pointer, sourceFrameRefCon unsafe.Pointer, infoFlagsOut *VTDecodeInfoFlags) int

func VTDecompressionSessionDecodeFrameWithOptionsAndOutputHandler ¶

func VTDecompressionSessionDecodeFrameWithOptionsAndOutputHandler(session unsafe.Pointer, sampleBuffer unsafe.Pointer, decodeFlags VTDecodeFrameFlags, frameOptions unsafe.Pointer, infoFlagsOut *VTDecodeInfoFlags, outputHandler objc.Block) int

func VTDecompressionSessionDecodeFrameWithOutputHandler ¶

func VTDecompressionSessionDecodeFrameWithOutputHandler(session unsafe.Pointer, sampleBuffer unsafe.Pointer, decodeFlags VTDecodeFrameFlags, infoFlagsOut *VTDecodeInfoFlags, outputHandler objc.Block) int

func VTDecompressionSessionFinishDelayedFrames ¶

func VTDecompressionSessionFinishDelayedFrames(session unsafe.Pointer) int

func VTDecompressionSessionGetTypeID ¶

func VTDecompressionSessionGetTypeID() uint

func VTDecompressionSessionInvalidate ¶

func VTDecompressionSessionInvalidate(session unsafe.Pointer)

func VTDecompressionSessionSetMultiImageCallback ¶

func VTDecompressionSessionSetMultiImageCallback(decompressionSession unsafe.Pointer, outputMultiImageCallback unsafe.Pointer, outputMultiImageRefcon unsafe.Pointer) int

func VTDecompressionSessionWaitForAsynchronousFrames ¶

func VTDecompressionSessionWaitForAsynchronousFrames(session unsafe.Pointer) int

func VTFrameProcessorErrorDomain ¶

func VTFrameProcessorErrorDomain() uintptr

func VTFrameRateConversionConfigurationIsSupported ¶

func VTFrameRateConversionConfigurationIsSupported() bool

Reports whether the system supports this processor.

func VTFrameRateConversionConfigurationSupportedRevisions ¶

func VTFrameRateConversionConfigurationSupportedRevisions() *foundation.NSIndexSet

Provides the collection of currently supported algorithms or configuration revisions for the class of configuration. A property you use to introspect at runtime which revisions are available for each configuration.

func VTFrameSiloAddSampleBuffer ¶

func VTFrameSiloAddSampleBuffer(silo unsafe.Pointer, sampleBuffer unsafe.Pointer) int

func VTFrameSiloCallBlockForEachSampleBuffer ¶

func VTFrameSiloCallBlockForEachSampleBuffer(silo unsafe.Pointer, timeRange coremedia.CMTimeRange, handler func(unsafe.Pointer) unsafe.Pointer) int

func VTFrameSiloCallFunctionForEachSampleBuffer ¶

func VTFrameSiloCallFunctionForEachSampleBuffer(silo unsafe.Pointer, timeRange coremedia.CMTimeRange, refcon unsafe.Pointer, callback unsafe.Pointer) int

func VTFrameSiloCreate ¶

func VTFrameSiloCreate(allocator unsafe.Pointer, fileURL unsafe.Pointer, timeRange coremedia.CMTimeRange, options unsafe.Pointer, frameSiloOut unsafe.Pointer) int

func VTFrameSiloGetProgressOfCurrentPass ¶

func VTFrameSiloGetProgressOfCurrentPass(silo unsafe.Pointer, progressOut *float32) int

func VTFrameSiloGetTypeID ¶

func VTFrameSiloGetTypeID() uint

func VTFrameSiloSetTimeRangesForNextPass ¶

func VTFrameSiloSetTimeRangesForNextPass(silo unsafe.Pointer, timeRangeCount int, timeRangeArray *coremedia.CMTimeRange) int

func VTHDRPerFrameMetadataGenerationSessionAttachMetadata ¶

func VTHDRPerFrameMetadataGenerationSessionAttachMetadata(hdrPerFrameMetadataGenerationSession unsafe.Pointer, pixelBuffer unsafe.Pointer, sceneChange uint8) int

func VTHDRPerFrameMetadataGenerationSessionCreate ¶

func VTHDRPerFrameMetadataGenerationSessionCreate(allocator unsafe.Pointer, framesPerSecond float32, options unsafe.Pointer, hdrPerFrameMetadataGenerationSessionOut unsafe.Pointer) int

func VTHDRPerFrameMetadataGenerationSessionGetTypeID ¶

func VTHDRPerFrameMetadataGenerationSessionGetTypeID() uint

func VTIsHardwareDecodeSupported ¶

func VTIsHardwareDecodeSupported(codecType uint) uint8

func VTIsStereoMVHEVCDecodeSupported ¶

func VTIsStereoMVHEVCDecodeSupported() uint8

func VTIsStereoMVHEVCEncodeSupported ¶

func VTIsStereoMVHEVCEncodeSupported() uint8

func VTLowLatencyFrameInterpolationConfigurationIsSupported ¶

func VTLowLatencyFrameInterpolationConfigurationIsSupported() bool

Reports whether the system supports this processor.

func VTLowLatencySuperResolutionScalerConfigurationIsSupported ¶

func VTLowLatencySuperResolutionScalerConfigurationIsSupported() bool

Reports whether the system supports this processor on the current configuration.

func VTLowLatencySuperResolutionScalerConfigurationMaximumDimensions ¶

func VTLowLatencySuperResolutionScalerConfigurationMaximumDimensions() coremedia.CMVideoDimensions

Maximum dimensions for a source frame for the processor.

func VTLowLatencySuperResolutionScalerConfigurationMinimumDimensions ¶

func VTLowLatencySuperResolutionScalerConfigurationMinimumDimensions() coremedia.CMVideoDimensions

Minimum dimensions for a source frame for the processor.

func VTLowLatencySuperResolutionScalerConfigurationSupportedScaleFactorsForFrameWidthFrameHeight ¶

func VTLowLatencySuperResolutionScalerConfigurationSupportedScaleFactorsForFrameWidthFrameHeight(frameWidth int, frameHeight int) *foundation.NSArray[*foundation.NSNumber]

Returns an array of supported scale factors values, or an empty list if the processor doesn't support the dimensions.

func VTMotionBlurConfigurationIsSupported ¶

func VTMotionBlurConfigurationIsSupported() bool

Reports whether the system supports this processor.

func VTMotionBlurConfigurationSupportedRevisions ¶

func VTMotionBlurConfigurationSupportedRevisions() *foundation.NSIndexSet

Provides the collection of currently supported algorithms or configuration revisions for the class of configuration. A property you use to introspect at runtime which revisions are available for each configuration.

func VTMotionEstimationSessionCompleteFrames ¶

func VTMotionEstimationSessionCompleteFrames(session unsafe.Pointer) int

func VTMotionEstimationSessionCopySourcePixelBufferAttributes ¶

func VTMotionEstimationSessionCopySourcePixelBufferAttributes(motionEstimationSession unsafe.Pointer, attributesOut unsafe.Pointer) int

func VTMotionEstimationSessionCreate ¶

func VTMotionEstimationSessionCreate(allocator unsafe.Pointer, motionVectorProcessorSelectionOptions unsafe.Pointer, width uint32, height uint32, motionEstimationSessionOut unsafe.Pointer) int

func VTMotionEstimationSessionEstimateMotionVectors ¶

func VTMotionEstimationSessionEstimateMotionVectors(session unsafe.Pointer, referenceImage unsafe.Pointer, currentImage unsafe.Pointer, motionEstimationFrameFlags VTMotionEstimationFrameFlags, additionalFrameOptions unsafe.Pointer, outputHandler func(int, VTMotionEstimationInfoFlags, unsafe.Pointer, unsafe.Pointer)) int

func VTMotionEstimationSessionGetTypeID ¶

func VTMotionEstimationSessionGetTypeID() uint

Get the CoreFoundation type identifier for motion-estimation session type.

func VTMotionEstimationSessionInvalidate ¶

func VTMotionEstimationSessionInvalidate(session unsafe.Pointer)

func VTMultiPassStorageClose ¶

func VTMultiPassStorageClose(multiPassStorage unsafe.Pointer) int

func VTMultiPassStorageCreate ¶

func VTMultiPassStorageCreate(allocator unsafe.Pointer, fileURL unsafe.Pointer, timeRange coremedia.CMTimeRange, options unsafe.Pointer, multiPassStorageOut unsafe.Pointer) int

func VTMultiPassStorageGetTypeID ¶

func VTMultiPassStorageGetTypeID() uint

func VTOpticalFlowConfigurationIsSupported ¶

func VTOpticalFlowConfigurationIsSupported() bool

Reports whether the system supports this processor.

func VTOpticalFlowConfigurationSupportedRevisions ¶

func VTOpticalFlowConfigurationSupportedRevisions() *foundation.NSIndexSet

Provides the collection of currently supported algorithms or configuration revisions for the class of configuration. A property you use to introspect at runtime which revisions are available for each configuration.

func VTPixelRotationSessionCreate ¶

func VTPixelRotationSessionCreate(allocator unsafe.Pointer, pixelRotationSessionOut unsafe.Pointer) int

func VTPixelRotationSessionGetTypeID ¶

func VTPixelRotationSessionGetTypeID() uint

func VTPixelRotationSessionInvalidate ¶

func VTPixelRotationSessionInvalidate(session unsafe.Pointer)

func VTPixelRotationSessionRotateImage ¶

func VTPixelRotationSessionRotateImage(session unsafe.Pointer, sourceBuffer unsafe.Pointer, destinationBuffer unsafe.Pointer) int

func VTPixelTransferSessionCreate ¶

func VTPixelTransferSessionCreate(allocator unsafe.Pointer, pixelTransferSessionOut unsafe.Pointer) int

func VTPixelTransferSessionGetTypeID ¶

func VTPixelTransferSessionGetTypeID() uint

func VTPixelTransferSessionInvalidate ¶

func VTPixelTransferSessionInvalidate(session unsafe.Pointer)

func VTPixelTransferSessionTransferImage ¶

func VTPixelTransferSessionTransferImage(session unsafe.Pointer, sourceBuffer unsafe.Pointer, destinationBuffer unsafe.Pointer) int

func VTRAWProcessingSessionCompleteFrames ¶

func VTRAWProcessingSessionCompleteFrames(session unsafe.Pointer) int

func VTRAWProcessingSessionCopyProcessingParameters ¶

func VTRAWProcessingSessionCopyProcessingParameters(session unsafe.Pointer, outParameterArray unsafe.Pointer) int

func VTRAWProcessingSessionCreate ¶

func VTRAWProcessingSessionCreate(allocator unsafe.Pointer, formatDescription unsafe.Pointer, outputPixelBufferAttributes unsafe.Pointer, processingSessionOptions unsafe.Pointer, processingSessionOut unsafe.Pointer) int

func VTRAWProcessingSessionGetTypeID ¶

func VTRAWProcessingSessionGetTypeID() uint

func VTRAWProcessingSessionInvalidate ¶

func VTRAWProcessingSessionInvalidate(session unsafe.Pointer)

func VTRAWProcessingSessionProcessFrame ¶

func VTRAWProcessingSessionProcessFrame(session unsafe.Pointer, inputPixelBuffer unsafe.Pointer, frameOptions unsafe.Pointer, outputHandler func(int, unsafe.Pointer)) int

func VTRAWProcessingSessionSetParameterChangedHandler ¶

func VTRAWProcessingSessionSetParameterChangedHandler(session unsafe.Pointer, parameterChangeHandler func(unsafe.Pointer)) int

func VTRAWProcessingSessionSetProcessingParameters ¶

func VTRAWProcessingSessionSetProcessingParameters(session unsafe.Pointer, processingParameters unsafe.Pointer) int

func VTRegisterProfessionalVideoWorkflowVideoDecoders ¶

func VTRegisterProfessionalVideoWorkflowVideoDecoders()

@function VTRegisterProfessionalVideoWorkflowVideoDecoders @abstract Allows the client to use video decoders appropriate for professional video workflows. @discussion By calling this function, a client indicates to VideoToolbox that it wishes to support Media Extension video decoders. Any associated Video RAW Processors will also be supported as well. Note that this functionality is intended for applications supporting professional video workflows. It is not recommended for network-facing applications such as web browsers, messaging clients, mail clients, etc.

func VTRegisterProfessionalVideoWorkflowVideoEncoders ¶

func VTRegisterProfessionalVideoWorkflowVideoEncoders()

@function VTRegisterProfessionalVideoWorkflowVideoEncoders @abstract Allows the client to use encoders appropriate for professional video workflows.

func VTRegisterSupplementalVideoDecoderIfAvailable ¶

func VTRegisterSupplementalVideoDecoderIfAvailable(codecType uint)

@function VTRegisterSupplementalVideoDecoderIfAvailable @abstract Requests that a video decoder, if available, be registered for the specified CMVideoCodecType @param codecType The CMVideoCodecType corresponding the format being requested @discussion This call will register a video decoder for the provided CMVideoCodecType if such a decoder is present on the system but not registered by default. You can call VTIsHardwareDecodeAvailable to confirm availability of the decoder after calling VTRegisterSupplementalVideoDecoderIfAvailable. Supplemental video decoders registered through this API will not work in applications which have not performed this opt in. For broadest ecosystem compatibility, we encourage use of platform-standard formats such as H.264, HEVC, and AV1.

func VTSessionCopyProperty ¶

func VTSessionCopyProperty(session unsafe.Pointer, propertyKey unsafe.Pointer, allocator unsafe.Pointer, propertyValueOut unsafe.Pointer) int

func VTSessionCopySerializableProperties ¶

func VTSessionCopySerializableProperties(session unsafe.Pointer, allocator unsafe.Pointer, dictionaryOut unsafe.Pointer) int

func VTSessionCopySupportedPropertyDictionary ¶

func VTSessionCopySupportedPropertyDictionary(session unsafe.Pointer, supportedPropertyDictionaryOut unsafe.Pointer) int

func VTSessionSetProperties ¶

func VTSessionSetProperties(session unsafe.Pointer, propertyDictionary unsafe.Pointer) int

func VTSessionSetProperty ¶

func VTSessionSetProperty(session unsafe.Pointer, propertyKey unsafe.Pointer, propertyValue unsafe.Pointer) int

func VTSuperResolutionScalerConfigurationIsSupported ¶

func VTSuperResolutionScalerConfigurationIsSupported() bool

Reports whether the system supports this processor.

func VTSuperResolutionScalerConfigurationSupportedRevisions ¶

func VTSuperResolutionScalerConfigurationSupportedRevisions() *foundation.NSIndexSet

Provides the collection of currently supported algorithms or configuration revisions for the class of configuration. A property you use to introspect at runtime which revisions are available for each configuration.

func VTSuperResolutionScalerConfigurationSupportedScaleFactors ¶

func VTSuperResolutionScalerConfigurationSupportedScaleFactors() *foundation.NSArray[*foundation.NSNumber]

Reports the set of supported scale factors to use when initializing a super-resolution scaler configuration.

func VTTemporalNoiseFilterConfigurationIsSupported ¶

func VTTemporalNoiseFilterConfigurationIsSupported() bool

Reports whether the system supports this processor.

func VTTemporalNoiseFilterConfigurationMaximumDimensions ¶

func VTTemporalNoiseFilterConfigurationMaximumDimensions() coremedia.CMVideoDimensions

The maximum dimensions of a source frame that the processor supports.

func VTTemporalNoiseFilterConfigurationMinimumDimensions ¶

func VTTemporalNoiseFilterConfigurationMinimumDimensions() coremedia.CMVideoDimensions

The minimum dimensions of a source frame that the processor supports.

func VTTemporalNoiseFilterConfigurationSupportedSourcePixelFormats ¶

func VTTemporalNoiseFilterConfigurationSupportedSourcePixelFormats() *foundation.NSArray[*foundation.NSNumber]

List of all supported pixel formats for source frames.