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Originally committed as revision 2668 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 21 years ago
parent b1b8f9fc58
commit 51929fd312
1 changed files with 12 additions and 18 deletions
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  1. 30
      libavcodec/mpeg12.c

30
libavcodec/mpeg12.c
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@ -1016,14 +1016,11 @@ static inline int get_dmv(MpegEncContext *s)
static inline int get_qscale(MpegEncContext *s)
{
int qscale = get_bits(&s->gb, 5);
if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
if (s->q_scale_type) {
return non_linear_qscale[qscale];
} else {
return qscale << 1;
}
if (s->q_scale_type) {
return non_linear_qscale[qscale];
} else {
return qscale << 1;
}
return qscale;
}
/* motion type (for mpeg2) */
@ -1453,7 +1450,7 @@ static inline int mpeg1_decode_block_intra(MpegEncContext *s,
} else if(level != 0) {
i += run;
j = scantable[i];
level= (level*qscale*quant_matrix[j])>>3;
level= (level*qscale*quant_matrix[j])>>4;
level= (level-1)|1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
@ -1471,11 +1468,11 @@ static inline int mpeg1_decode_block_intra(MpegEncContext *s,
j = scantable[i];
if(level<0){
level= -level;
level= (level*qscale*quant_matrix[j])>>3;
level= (level*qscale*quant_matrix[j])>>4;
level= (level-1)|1;
level= -level;
}else{
level= (level*qscale*quant_matrix[j])>>3;
level= (level*qscale*quant_matrix[j])>>4;
level= (level-1)|1;
}
}
@ -1511,7 +1508,7 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
v= SHOW_UBITS(re, &s->gb, 2);
if (v & 2) {
LAST_SKIP_BITS(re, &s->gb, 2);
level= (3*qscale*quant_matrix[0])>>4;
level= (3*qscale*quant_matrix[0])>>5;
level= (level-1)|1;
if(v&1)
level= -level;
@ -1529,7 +1526,7 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
} else if(level != 0) {
i += run;
j = scantable[i];
level= ((level*2+1)*qscale*quant_matrix[j])>>4;
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
level= (level-1)|1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
@ -1547,11 +1544,11 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
j = scantable[i];
if(level<0){
level= -level;
level= ((level*2+1)*qscale*quant_matrix[j])>>4;
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
level= (level-1)|1;
level= -level;
}else{
level= ((level*2+1)*qscale*quant_matrix[j])>>4;
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
level= (level-1)|1;
}
}
@ -2313,10 +2310,7 @@ static int slice_end(AVCodecContext *avctx, AVFrame *pict)
if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
/* end of image */
if(s->codec_id == CODEC_ID_MPEG2VIDEO){
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
}else
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
ff_er_frame_end(s);

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