diff options
| -rw-r--r-- | libavutil/frame.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libavutil/frame.h b/libavutil/frame.h index 8fc5814aff..b5d4694b92 100644 --- a/libavutil/frame.h +++ b/libavutil/frame.h @@ -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]; |