codec

type BitReader ¶

type BitReader struct {
	// contains filtered or unexported fields
}

-------- BitReader --------

func NewBitReader(data []byte) *BitReader

func (br *BitReader) ReadBits(n int) (uint, error)

func (br *BitReader) ReadFlag() (bool, error)

func (br *BitReader) ReadSE() (int, error)

func (br *BitReader) ReadUE() (uint, error)

type SPSInfo ¶

type SPSInfo struct {
	ChromaFormatIDC             uint
	PicWidthInLumaSamples       uint
	PicHeightInLumaSamples      uint
	ConformanceWindowFlag       bool
	ConfWinLeftOffset           uint
	ConfWinRightOffset          uint
	ConfWinTopOffset            uint
	ConfWinBottomOffset         uint
	CodedWidth, CodedHeight     uint // Raw coded resolution
	DisplayWidth, DisplayHeight uint // Resolution after conformance window cropping
}

SPSInfo holds parsed SPS parameters

type VP8 ¶

type VP8 struct {
	FirstByte byte
	S         bool

	I         bool
	M         bool
	PictureID uint16 /* 7 or 15 bits, picture ID */

	L         bool
	TL0PICIDX uint8 /* 8 bits temporal level zero index */

	// Optional Header If either of the T or K bits are set to 1,
	// the TID/Y/KEYIDX extension field MUST be present.
	T   bool
	TID uint8 /* 2 bits temporal layer idx */
	Y   bool

	K      bool
	KEYIDX uint8 /* 5 bits of key frame idx */

	HeaderSize int

	// IsKeyFrame is a helper to detect if current packet is a keyframe
	IsKeyFrame bool
}

VP8 is a helper to get temporal data from VP8 packet header

VP8 Payload Descriptor
		0 1 2 3 4 5 6 7                      0 1 2 3 4 5 6 7
		+-+-+-+-+-+-+-+-+                   +-+-+-+-+-+-+-+-+
		|X|R|N|S|R| PID | (REQUIRED)        |X|R|N|S|R| PID | (REQUIRED)
		+-+-+-+-+-+-+-+-+                   +-+-+-+-+-+-+-+-+
	X:  |I|L|T|K| RSV   | (OPTIONAL)   X:   |I|L|T|K| RSV   | (OPTIONAL)
		+-+-+-+-+-+-+-+-+                   +-+-+-+-+-+-+-+-+
	I:  |M| PictureID   | (OPTIONAL)   I:   |M| PictureID   | (OPTIONAL)
		+-+-+-+-+-+-+-+-+                   +-+-+-+-+-+-+-+-+
	L:  |   TL0PICIDX   | (OPTIONAL)        |   PictureID   |
		+-+-+-+-+-+-+-+-+                   +-+-+-+-+-+-+-+-+
	T/K:|TID|Y| KEYIDX  | (OPTIONAL)   L:   |   TL0PICIDX   | (OPTIONAL)
		+-+-+-+-+-+-+-+-+                   +-+-+-+-+-+-+-+-+
	T/K:|TID|Y| KEYIDX  | (OPTIONAL)
		+-+-+-+-+-+-+-+-+

func (v VP8) Marshal() ([]byte, error)

func (v VP8) MarshalTo(buf []byte) (int, error)

func (v *VP8) Unmarshal(payload []byte) error

type VideoSize ¶

type VideoSize struct {
	Width  uint32
	Height uint32
}

VideoSize represents video resolution

func ExtractH264VideoSize(payload []byte) VideoSize

func ExtractH265VideoSize(payload []byte) VideoSize

func ExtractVP8VideoSize(vp8Packet *VP8, payload []byte) VideoSize