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Optimize esc removal code. 

Originally committed as revision 16294 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-12-23 18:31:44 +00:00
parent ffedb5c19a
commit 593af7cdda
1 changed files with 11 additions and 4 deletions
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15
libavcodec/h264.c
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@ -1423,21 +1423,28 @@ static const uint8_t *decode_nal(H264Context *h, const uint8_t *src, int *dst_le
}
//printf("decoding esc\n");
si=di=0;
while(si<length){
memcpy(dst, src, i);
si=di=i;
while(si+2<length){
//remove escapes (very rare 1:2^22)
if(si+2<length && src[si]==0 && src[si+1]==0 && src[si+2]<=3){
if(src[si+2]>3){
dst[di++]= src[si++];
dst[di++]= src[si++];
}else if(src[si]==0 && src[si+1]==0){
if(src[si+2]==3){ //escape
dst[di++]= 0;
dst[di++]= 0;
si+=3;
continue;
}else //next start code
break;
goto nsc;
}
dst[di++]= src[si++];
}
while(si<length)
dst[di++]= src[si++];
nsc:
memset(dst+di, 0, FF_INPUT_BUFFER_PADDING_SIZE);