generic-library/ffmpeg
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Optimize get_dct8x8_allowed().

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30 cpu cycles faster on pentium dual.

Originally committed as revision 16248 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-12-20 23:11:30 +00:00
parent 6beb8b2612
commit 66c07ca96f
2 changed files with 5 additions and 8 deletions
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11
libavcodec/h264.c
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@ -4039,13 +4039,10 @@ static inline int get_level_prefix(GetBitContext *gb){
}
static inline int get_dct8x8_allowed(H264Context *h){
int i;
for(i=0; i<4; i++){
if(!IS_SUB_8X8(h->sub_mb_type[i])
|| (!h->sps.direct_8x8_inference_flag && IS_DIRECT(h->sub_mb_type[i])))
return 0;
}
return 1;
if(h->sps.direct_8x8_inference_flag)
return !(*(uint64_t*)h->sub_mb_type & ((MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8 )*0x0001000100010001ULL));
else
return !(*(uint64_t*)h->sub_mb_type & ((MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8|MB_TYPE_DIRECT2)*0x0001000100010001ULL));
}
/**

2
libavcodec/h264.h
View File

@ -339,7 +339,7 @@ typedef struct H264Context{
int mb_field_decoding_flag;
int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
unsigned int sub_mb_type[4];
uint16_t sub_mb_type[4];
//POC stuff
int poc_lsb;