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avoid clearing block[] if its not used at all 

Originally committed as revision 4148 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-04-21 21:23:22 +00:00
parent e2e5894a91
commit 2de4ba7ff7
1 changed files with 12 additions and 5 deletions
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17
libavcodec/mpeg12.c
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@ -1140,6 +1140,12 @@ static int mpeg_decode_mb(MpegEncContext *s,
dprintf("mb_type=%x\n", mb_type);
// motion_type = 0; /* avoid warning */
if (IS_INTRA(mb_type)) {
s->dsp.clear_blocks(s->block[0]);
if(!s->chroma_y_shift){
s->dsp.clear_blocks(s->block[6]);
}
/* compute dct type */
if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
!s->frame_pred_frame_dct) {
@ -1357,8 +1363,13 @@ static int mpeg_decode_mb(MpegEncContext *s,
}
s->mb_intra = 0;
if (HAS_CBP(mb_type)) {
s->dsp.clear_blocks(s->block[0]);
if(!s->chroma_y_shift){
s->dsp.clear_blocks(s->block[6]);
}
cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){
av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
@ -2578,10 +2589,6 @@ static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
XVMC_init_block(s);//set s->block
#endif
s->dsp.clear_blocks(s->block[0]);
if(!s->chroma_y_shift){
s->dsp.clear_blocks(s->block[6]);
}
ret = mpeg_decode_mb(s, s->block);
s->chroma_qscale= s->qscale;