Documentation
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Overview ¶
Package ffv1 implements an FFV1 Version 3 decoder based off of draft-ietf-cellar-ffv1.
Index ¶
Constants ¶
const ( YCbCr = 0 RGB = 1 )
Colorspaces. From 4.1.5. colorspace_type
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Decoder ¶
type Decoder struct {
// contains filtered or unexported fields
}
Decoder is a FFV1 decoder instance.
func NewDecoder ¶
NewDecoder creates a new FFV1 decoder instance.
'record' is the codec private data provided by the container. For Matroska, this is what is in CodecPrivate (adjusted for e.g. VFW data that may be before it). For ISOBMFF, this is the 'glbl' box.
'width' and 'height' are the frame width and height provided by the container.
type Frame ¶
type Frame struct {
// Image data. Valid only when BitDepth is 8.
Buf [][]byte
// Image data. Valid only when BitDepth is greater than 8.
Buf16 [][]uint16
// Width of the frame, in pixels.
Width uint32
// Height of the frame, in pixels.
Height uint32
// BitDepth of the frame (8-16).
BitDepth uint8
// ColorSpace of the frame. See the ColorSpace constants.
ColorSpace int
// Whether or not chroma planes are present.
HasChroma bool
// Whether or not an alpha plane is present.
HasAlpha bool
// The log2 vertical chroma subampling value.
ChromaSubsampleV uint8
// The log2 horizontal chroma subsampling value.
ChromaSubsampleH uint8
}
Frame contains a decoded FFV1 frame and relevant data about the frame.
If BitDepth is 8, image data is in Buf. If it is anything else, image data is in Buf16.
Image data consists of up to four contiguous planes, as follows:
- If ColorSpace is YCbCr:
- Plane 0 is Luma (always present)
- If HasChroma is true, the next two planes are Cr and Cr, subsampled by ChromaSubsampleV and ChromaSubsampleH.
- If HasAlpha is true, the next plane is alpha.
- If ColorSpace is RGB:
- Plane 0 is Red
- Plane 1 is Green
- Plane 2 is Blue
- If HasAlpha is true, plane 4 is alpha.
Source Files
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Directories
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| Path | Synopsis |
|---|---|
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Package golomb implements a Golomb-Rice coder as per Section 3.8.2.
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Package golomb implements a Golomb-Rice coder as per Section 3.8.2. |
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Package rangecoer implements a range coder as per 3.8.1.
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Package rangecoer implements a range coder as per 3.8.1. |