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avutil/frame: document alignment and padding requirements

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-17 03:20:16 +01:00
parent 76d1c07c89
commit 3dc25c3ab2
1 changed files with 10 additions and 0 deletions
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10
libavutil/frame.h
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@ -78,6 +78,11 @@ typedef struct AVFrame {
/**
* pointer to the picture/channel planes.
* This might be different from the first allocated byte
*
* Some decoders access areas outside 0,0 - width,height, please
* see avcodec_align_dimensions2(). Some filters and swscale can read
* up to 16 bytes beyond the planes, if these filters are to be used,
* then 16 extra bytes must be allocated.
*/
uint8_t *data[AV_NUM_DATA_POINTERS];
@ -87,6 +92,11 @@ typedef struct AVFrame {
*
* For audio, only linesize[0] may be set. For planar audio, each channel
* plane must be the same size.
*
* For video the linesizes should be multiplies of the CPUs alignment
* preferrance, this is 16 or 32 for modern desktop CPUs.
* Some code requires such alignment other code can be slower without
* correct alignment, for yet other it makes no difference.
*/
int linesize[AV_NUM_DATA_POINTERS];