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detecting xvid/divx4/opendivx and set low_delay flag

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Originally committed as revision 425 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-04-27 14:10:47 +00:00
parent 2417652e9f
commit f94985d046
1 changed files with 11 additions and 1 deletions
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12
libavcodec/h263.c
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@ -2584,6 +2584,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
{ {
int time_incr, startcode, state, v; int time_incr, startcode, state, v;
int time_increment; int time_increment;
int vol_control=-1;
redo: redo:
/* search next start code */ /* search next start code */
@ -2627,7 +2628,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
skip_bits(&s->gb, 8); // par_height skip_bits(&s->gb, 8); // par_height
} }
if(get_bits1(&s->gb)){ /* vol control parameter */ if(vol_control=get_bits1(&s->gb)){ /* vol control parameter */
int chroma_format= get_bits(&s->gb, 2); int chroma_format= get_bits(&s->gb, 2);
if(chroma_format!=1){ if(chroma_format!=1){
printf("illegal chroma format\n"); printf("illegal chroma format\n");
@ -2943,8 +2944,17 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
} }
} }
} }
/* detect buggy encoders which dont set the low_delay flag (divx4/xvid/opendivx)*/
// note we cannot detect divx5 without b-frames easyly (allthough its buggy too)
if(s->vo_type==0 && vol_control==0 && s->divx_version==0){
if(s->picture_number==0)
printf("looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
s->low_delay=1;
}
s->picture_number++; // better than pic number==0 allways ;) s->picture_number++; // better than pic number==0 allways ;)
//printf("done\n"); //printf("done\n");
return 0; return 0;
} }