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Optimize 0 0 0-3 search, 45% faster on pentium dual.
Originally committed as revision 16284 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -1375,9 +1375,26 @@ static const uint8_t *decode_nal(H264Context *h, const uint8_t *src, int *dst_le
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for(i=0; i<length; i++)
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printf("%2X ", src[i]);
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#endif
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#ifdef HAVE_FAST_UNALIGNED
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# ifdef HAVE_FAST_64BIT
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# define RS 7
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for(i=0; i+1<length; i+=9){
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if(!((~*(uint64_t*)(src+i) & (*(uint64_t*)(src+i) - 0x0100010001000101ULL)) & 0x8000800080008080ULL))
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# else
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# define RS 3
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for(i=0; i+1<length; i+=5){
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if(!((~*(uint32_t*)(src+i) & (*(uint32_t*)(src+i) - 0x01000101U)) & 0x80008080U))
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# endif
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continue;
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if(i>0 && !src[i]) i--;
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while(src[i]) i++;
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#else
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# define RS 0
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for(i=0; i+1<length; i+=2){
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if(src[i]) continue;
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if(i>0 && src[i-1]==0) i--;
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#endif
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if(i+2<length && src[i+1]==0 && src[i+2]<=3){
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if(src[i+2]!=3){
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/* startcode, so we must be past the end */
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