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Code Issues Releases Activity

h263_dc_scale() cleanup

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Originally committed as revision 972 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-09-26 09:16:23 +00:00
parent fcb48651f4
commit 5482970b4b
1 changed files with 18 additions and 40 deletions
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58
libavcodec/h263.c
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@ -1623,8 +1623,15 @@ void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
s->v_edge_pos= s->height;
}
static void h263_dc_scale(MpegEncContext * s)
static void change_qscale(MpegEncContext * s, int dquant)
{
s->qscale += dquant;
if (s->qscale < 1)
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
}
@ -2385,12 +2392,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
s->mb_intra = 1;
if(cbpc & 4) {
s->qscale += quant_tab[get_bits(&s->gb, 2)];
if (s->qscale < 1)
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
change_qscale(s, quant_tab[get_bits(&s->gb, 2)]);
}
s->qscale_table[xy]= s->qscale;
@ -2567,12 +2569,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
}
if(s->cbp_table[xy] & 8) {
s->qscale += quant_tab[get_bits(&s->gb, 2)];
if (s->qscale < 1)
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
change_qscale(s, quant_tab[get_bits(&s->gb, 2)]);
}
s->qscale_table[xy]= s->qscale;
@ -2601,13 +2598,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
}
if(s->cbp_table[xy] & 8) {
//fprintf(stderr, "dquant\n");
s->qscale += quant_tab[get_bits(&s->gb, 2)];
if (s->qscale < 1)
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
change_qscale(s, quant_tab[get_bits(&s->gb, 2)]);
}
s->qscale_table[xy]= s->qscale;
@ -2643,7 +2634,8 @@ static int mpeg4_decode_partitioned_mb(MpegEncContext *s,
s->mb_x= s->resync_mb_x;
s->mb_y= s->resync_mb_y;
s->qscale= qscale;
h263_dc_scale(s);
s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
if(s->decoding_error==DECODING_DESYNC) return -1;
}
@ -2656,7 +2648,8 @@ static int mpeg4_decode_partitioned_mb(MpegEncContext *s,
if(s->decoding_error!=DECODING_ACDC_LOST && s->qscale_table[xy] != s->qscale){
s->qscale= s->qscale_table[xy];
h263_dc_scale(s);
s->y_dc_scale= s->y_dc_scale_table[ s->qscale ];
s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
}
if (s->pict_type == P_TYPE || s->pict_type==S_TYPE) {
@ -2843,12 +2836,7 @@ int h263_decode_mb(MpegEncContext *s,
cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
cbp = (cbpc & 3) | ((cbpy ^ 0xf) << 2);
if (dquant) {
s->qscale += quant_tab[get_bits(&s->gb, 2)];
if (s->qscale < 1)
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
change_qscale(s, quant_tab[get_bits(&s->gb, 2)]);
}
if((!s->progressive_sequence) && (cbp || s->workaround_bugs==2))
s->interlaced_dct= get_bits1(&s->gb);
@ -2997,12 +2985,7 @@ int h263_decode_mb(MpegEncContext *s,
if (mb_type!=MB_TYPE_B_DIRECT && cbp) {
if(get_bits1(&s->gb)){
s->qscale +=get_bits1(&s->gb)*4 - 2;
if (s->qscale < 1)
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
change_qscale(s, get_bits1(&s->gb)*4 - 2);
}
}
field_mv=0;
@ -3162,12 +3145,7 @@ intra:
if(cbpy<0) return -1;
cbp = (cbpc & 3) | (cbpy << 2);
if (dquant) {
s->qscale += quant_tab[get_bits(&s->gb, 2)];
if (s->qscale < 1)
s->qscale = 1;
else if (s->qscale > 31)
s->qscale = 31;
h263_dc_scale(s);
change_qscale(s, quant_tab[get_bits(&s->gb, 2)]);
}
if(!s->progressive_sequence)
s->interlaced_dct= get_bits1(&s->gb);