codestream

type Builder struct {

	// Image parameters
	Width      uint32
	Height     uint32
	NumComps   int
	BitDepth   int
	TileWidth  uint32
	TileHeight uint32

	// Coding parameters
	DecompLevels    int
	NumLayers       int
	ProgressOrder   int
	CodeBlockWidth  int
	CodeBlockHeight int
	Reversible      bool // true = 5/3 wavelet, false = 9/7 wavelet
	// contains filtered or unexported fields
}

type CODMarker struct {
	Scod             uint8   // Coding style flags
	ProgressionOrder uint8   // Progression order
	NumLayers        uint16  // Number of layers
	MCT              uint8   // Multiple component transform
	NumDecompLevels  uint8   // Number of decomposition levels
	CodeBlockWidth   uint8   // Code-block width exponent (offset by 2)
	CodeBlockHeight  uint8   // Code-block height exponent (offset by 2)
	CodeBlockStyle   uint8   // Code-block coding style
	Transform        uint8   // Wavelet transform (0=9/7 irreversible, 1=5/3 reversible)
	PrecinctSizes    []uint8 // Precinct sizes per resolution level (if Scod bit 0 set)
}

type Codestream struct {
	SIZ       *SIZMarker  // Image and tile size
	COD       *CODMarker  // Coding style default
	QCD       *QCDMarker  // Quantization default
	TileParts []*TilePart // Tile parts
	Comments  []string    // Comment markers
}

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

type QCDMarker struct {
	Sqcd  uint8         // Quantization style and guard bits
	SPqcd []QCDStepSize // Step sizes per subband
}

type QCDStepSize struct {
	Exponent uint8  // Exponent (5 bits)
	Mantissa uint16 // Mantissa (11 bits for scalar expounded, 0 for others)
}

type SIZComponent struct {
	SSiz  uint8 // Component bit depth (sign bit + depth-1)
	XRSiz uint8 // Horizontal subsampling
	YRSiz uint8 // Vertical subsampling
}

type SIZMarker struct {
	Rsiz       uint16         // Capabilities required
	XSiz       uint32         // Width of reference grid
	YSiz       uint32         // Height of reference grid
	XOSiz      uint32         // Horizontal offset from grid origin to image origin
	YOSiz      uint32         // Vertical offset from grid origin to image origin
	XTSiz      uint32         // Width of one tile
	YTSiz      uint32         // Height of one tile
	XTOSiz     uint32         // Horizontal offset from grid origin to first tile
	YTOSiz     uint32         // Vertical offset from grid origin to first tile
	CSiz       uint16         // Number of components
	Components []SIZComponent // Per-component parameters
}

type SOTMarker struct {
	Isot  uint16 // Tile index
	Psot  uint32 // Length of tile-part
	TPsot uint8  // Tile-part index
	TNsot uint8  // Number of tile-parts
}

type TilePart struct {
	TileIndex  uint16 // Tile index
	PartIndex  uint8  // Tile-part index
	NumParts   uint8  // Number of tile-parts (0 = unknown)
	Length     uint32 // Length of tile-part
	DataOffset int64  // Offset of tile-part data in stream
	Data       []byte // Tile-part data (after SOD)
}

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