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Clarify relations between log2_chroma_w, log2_chroma_h and comp.

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Originally committed as revision 20550 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2009-11-18 22:32:32 +00:00
parent 2091b27b68
commit 357561e73f
1 changed files with 9 additions and 1 deletions
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10
libavutil/pixdesc.h
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@ -62,6 +62,7 @@ typedef struct AVPixFmtDescriptor{
* For YV12 this is 1 for example. * For YV12 this is 1 for example.
* chroma_width = -((-luma_width) >> log2_chroma_w) * chroma_width = -((-luma_width) >> log2_chroma_w)
* The note above is needed to ensure rounding up. * The note above is needed to ensure rounding up.
* This value only refers to the chroma components.
*/ */
uint8_t log2_chroma_w; ///< chroma_width = -((-luma_width )>>log2_chroma_w) uint8_t log2_chroma_w; ///< chroma_width = -((-luma_width )>>log2_chroma_w)
@ -70,10 +71,17 @@ typedef struct AVPixFmtDescriptor{
* For YV12 this is 1 for example. * For YV12 this is 1 for example.
* chroma_height= -((-luma_height) >> log2_chroma_h) * chroma_height= -((-luma_height) >> log2_chroma_h)
* The note above is needed to ensure rounding up. * The note above is needed to ensure rounding up.
* This value only refers to the chroma components.
*/ */
uint8_t log2_chroma_h; uint8_t log2_chroma_h;
uint8_t flags; uint8_t flags;
AVComponentDescriptor comp[4]; ///< parameters that describe how pixels are packed
/**
* Parameters that describe how pixels are packed. If the format
* has chroma components, they must be stored in comp[1] and
* comp[2].
*/
AVComponentDescriptor comp[4];
}AVPixFmtDescriptor; }AVPixFmtDescriptor;
#define PIX_FMT_BE 1 ///< big-endian #define PIX_FMT_BE 1 ///< big-endian