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xvid "packed" stuff support 

Originally committed as revision 2708 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-01-15 01:29:26 +00:00
parent 29962fea47
commit fb204d4bc1
1 changed files with 12 additions and 6 deletions
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18
libavcodec/h263dec.c
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@ -425,9 +425,10 @@ uint64_t time= rdtsc();
return buf_size;
}
retry:
if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder
if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
}else
init_get_bits(&s->gb, buf, buf_size*8);
@ -678,21 +679,26 @@ retry:
/* divx 5.01+ bistream reorder stuff */
if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
int current_pos= get_bits_count(&s->gb)>>3;
int startcode_found=0;
if( buf_size - current_pos > 5
&& buf_size - current_pos < BITSTREAM_BUFFER_SIZE){
int i;
int startcode_found=0;
for(i=current_pos; i<buf_size-3; i++){
if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
startcode_found=1;
break;
}
}
if(startcode_found){
memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
s->bitstream_buffer_size= buf_size - current_pos;
}
}
if(s->gb.buffer == s->bitstream_buffer && buf_size>20){ //xvid style
startcode_found=1;
current_pos=0;
}
if(startcode_found){
memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
s->bitstream_buffer_size= buf_size - current_pos;
}
}