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Document new idct requirements.

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Originally committed as revision 16237 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-12-19 09:34:18 +00:00
parent a5805aa9d1
commit 6a1846eb4a
1 changed files with 4 additions and 0 deletions
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4
libavcodec/dsputil.h
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@ -442,6 +442,10 @@ typedef struct DSPContext {
#define EDGE_WIDTH 16
/* h264 functions */
/* NOTE!!! if you implement any of h264_idct8_add, h264_idct8_add4 then you must implement all of them
NOTE!!! if you implement any of h264_idct_add, h264_idct_add16, h264_idct_add16intra, h264_idct_add8 then you must implement all of them
The reason for above, is that no 2 out of one list may use a different permutation.
*/
void (*h264_idct_add)(uint8_t *dst/*align 4*/, DCTELEM *block/*align 16*/, int stride);
void (*h264_idct8_add)(uint8_t *dst/*align 8*/, DCTELEM *block/*align 16*/, int stride);
void (*h264_idct_dc_add)(uint8_t *dst/*align 4*/, DCTELEM *block/*align 16*/, int stride);