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Add ff_h263_find_resync_marker() to find the bit position of the next resync_marker, if any.

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patch by Gwenole Beauchesne gbeauchesne splitted-desktopcom
based on suggested implementation by me

Originally committed as revision 17560 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Gwenole Beauchesne 2009-02-24 16:12:47 +00:00 committed by Michael Niedermayer
parent cd3356ff73
commit ee3e36315e
2 changed files with 22 additions and 0 deletions
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21
libavcodec/h263.c
View File

@ -3292,6 +3292,27 @@ void ff_mpeg4_clean_buffers(MpegEncContext *s)
s->last_mv[1][0][1]= 0;
}
/**
* finds the next resync_marker
* @param p pointer to buffer to scan
* @param end pointer to the end of the buffer
* @return pointer to the next resync_marker, or \p end if none was found
*/
const uint8_t *ff_h263_find_resync_marker(const uint8_t *restrict p, const uint8_t * restrict end)
{
assert(p < end);
end-=2;
p++;
for(;p<end; p+=2){
if(!*p){
if (!p[-1] && p[1]) return p - 1;
else if(!p[ 1] && p[2]) return p;
}
}
return end+2;
}
/**
* decodes the group of blocks / video packet header.
* @return bit position of the resync_marker, or <0 if none was found

1
libavcodec/mpegvideo.h
View File

@ -836,6 +836,7 @@ void ff_clean_h263_qscales(MpegEncContext *s);
int ff_mpeg4_decode_partitions(MpegEncContext *s);
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
int ff_h263_resync(MpegEncContext *s);
const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
int ff_h263_get_gob_height(MpegEncContext *s);
void ff_mpeg4_init_direct_mv(MpegEncContext *s);
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);