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pixdesc: Use AV_CEIL_RSHIFT in documentation

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Vittorio Giovara 2016-01-21 18:00:15 -05:00
parent 1546a41ada
commit 6695f178a5
1 changed files with 3 additions and 3 deletions
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6
libavutil/pixdesc.h
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@ -84,16 +84,16 @@ typedef struct AVPixFmtDescriptor {
/** /**
* Amount to shift the luma width right to find the chroma width. * Amount to shift the luma width right to find the chroma width.
* For YV12 this is 1 for example. * For YV12 this is 1 for example.
* chroma_width = -((-luma_width) >> log2_chroma_w) * chroma_width = AV_CEIL_RSHIFT(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. * 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;
/** /**
* Amount to shift the luma height right to find the chroma height. * Amount to shift the luma height right to find the chroma height.
* For YV12 this is 1 for example. * For YV12 this is 1 for example.
* chroma_height= -((-luma_height) >> log2_chroma_h) * chroma_height= AV_CEIL_RSHIFT(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. * This value only refers to the chroma components.
*/ */