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ff_copy_bits() optimization 

Originally committed as revision 2777 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-02-14 01:25:41 +00:00
parent 842b556af2
commit b6335c9f5b
1 changed files with 10 additions and 5 deletions
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15
libavcodec/mpegvideo.c
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@ -3732,21 +3732,26 @@ void ff_mpeg_flush(AVCodecContext *avctx){
#ifdef CONFIG_ENCODERS
void ff_copy_bits(PutBitContext *pb, uint8_t *src, int length)
{
const uint16_t *srcw= src;
int words= length>>4;
int bits= length&15;
int i;
if(length==0) return;
if(put_bits_count(pb)&7){
for(i=0; i<words; i++) put_bits(pb, 16, be2me_16(((uint16_t*)src)[i]));
if(words < 16){
for(i=0; i<words; i++) put_bits(pb, 16, be2me_16(srcw[i]));
}else if(put_bits_count(pb)&7){
for(i=0; i<words; i++) put_bits(pb, 16, be2me_16(srcw[i]));
}else{
for(i=0; put_bits_count(pb)&31; i++)
put_bits(pb, 8, src[i]);
flush_put_bits(pb);
memcpy(pbBufPtr(pb), src, 2*words);
skip_put_bytes(pb, 2*words);
memcpy(pbBufPtr(pb), src+i, 2*words-i);
skip_put_bytes(pb, 2*words-i);
}
put_bits(pb, bits, be2me_16(((uint16_t*)src)[words])>>(16-bits));
put_bits(pb, bits, be2me_16(srcw[words])>>(16-bits));
}
static inline void copy_context_before_encode(MpegEncContext *d, MpegEncContext *s, int type){