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Code Issues Releases Activity

AIC/MQ encoding fix

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Originally committed as revision 2573 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-12-08 17:42:20 +00:00
parent 60efb3e42d
commit fb07988399
1 changed files with 38 additions and 20 deletions
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58
libavcodec/h263.c
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@ -730,7 +730,6 @@ void mpeg4_encode_mb(MpegEncContext * s,
// printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
if (!s->mb_intra) {
/* compute cbp */
int i, cbp;
if(s->pict_type==B_TYPE){
@ -1145,34 +1144,40 @@ void h263_encode_mb(MpegEncContext * s,
s->mv_bits+= get_bits_diff(s);
}
} else {
int li = s->h263_aic ? 0 : 1;
assert(s->mb_intra);
cbp = 0;
for(i=0; i<6; i++) {
if (s->h263_aic) {
/* Predict DC */
if (s->h263_aic) {
for(i=0; i<6; i++) {
int16_t level = block[i][0];
int scale;
if(i<4) scale= s->y_dc_scale;
else scale= s->c_dc_scale;
pred_dc = h263_pred_dc(s, i, &dc_ptr[i]);
level -= pred_dc;
/* Quant */
if (level < 0)
level = (level + (s->qscale >> 1))/(s->y_dc_scale);
if (level >= 0)
level = (level + (scale>>1))/scale;
else
level = (level - (s->qscale >> 1))/(s->y_dc_scale);
level = (level - (scale>>1))/scale;
/* AIC can change CBP */
if (level == 0 && s->block_last_index[i] == 0)
s->block_last_index[i] = -1;
else if (level < -127)
level = -127;
else if (level > 127)
level = 127;
if(!s->modified_quant){
if (level < -127)
level = -127;
else if (level > 127)
level = 127;
}
block[i][0] = level;
/* Reconstruction */
rec_intradc[i] = (s->y_dc_scale*level) + pred_dc;
rec_intradc[i] = scale*level + pred_dc;
/* Oddify */
rec_intradc[i] |= 1;
//if ((rec_intradc[i] % 2) == 0)
@ -1185,10 +1190,15 @@ void h263_encode_mb(MpegEncContext * s,
/* Update AC/DC tables */
*dc_ptr[i] = rec_intradc[i];
if (s->block_last_index[i] >= 0)
cbp |= 1 << (5 - i);
}
}else{
for(i=0; i<6; i++) {
/* compute cbp */
if (s->block_last_index[i] >= 1)
cbp |= 1 << (5 - i);
}
/* compute cbp */
if (s->block_last_index[i] >= li)
cbp |= 1 << (5 - i);
}
cbpc = cbp & 3;
@ -1907,9 +1917,17 @@ void h263_encode_init(MpegEncContext *s)
break;
case CODEC_ID_H263P:
s->fcode_tab= umv_fcode_tab;
s->min_qcoeff= -127;
s->max_qcoeff= 127;
if(s->umvplus)
s->fcode_tab= umv_fcode_tab;
else
s->fcode_tab= fcode_tab;
if(s->modified_quant){
s->min_qcoeff= -2047;
s->max_qcoeff= 2047;
}else{
s->min_qcoeff= -127;
s->max_qcoeff= 127;
}
break;
//Note for mpeg4 & h263 the dc-scale table will be set per frame as needed later
case CODEC_ID_FLV1: