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ffmpeg.wasm-core
Commit 38c619c1 authored by zhaoxiu.zeng's avatar zhaoxiu.zeng Committed by Michael Niedermayer
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avcodec/vc1: cleanup and simplification 

Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent e4a6486c
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Showing with 97 additions and 112 deletions
libavcodec/vc1.c
View file @ 38c619c1
......@@ -234,15 +234,11 @@ static int vop_dquant_decoding(VC1Context *v)
int pqdiff;
//variable size
if (v->dquant == 2) {
pqdiff = get_bits(gb, 3);
if (pqdiff == 7)
v->altpq = get_bits(gb, 5);
else
v->altpq = v->pq + pqdiff + 1;
} else {
if (v->dquant != 2) {
v->dquantfrm = get_bits1(gb);
if (v->dquantfrm) {
if (!v->dquantfrm)
return 0;
v->dqprofile = get_bits(gb, 2);
switch (v->dqprofile) {
case DQPROFILE_SINGLE_EDGE:
......@@ -251,20 +247,21 @@ static int vop_dquant_decoding(VC1Context *v)
break;
case DQPROFILE_ALL_MBS:
v->dqbilevel = get_bits1(gb);
if (!v->dqbilevel)
if (!v->dqbilevel) {
v->halfpq = 0;
return 0;
}
default:
break; //Forbidden ?
}
if (v->dqbilevel || v->dqprofile != DQPROFILE_ALL_MBS) {
}
pqdiff = get_bits(gb, 3);
if (pqdiff == 7)
v->altpq = get_bits(gb, 5);
else
v->altpq = v->pq + pqdiff + 1;
}
}
}
return 0;
}
......@@ -335,8 +332,7 @@ int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitCo
return -1;
}
v->extended_mv = get_bits1(gb); //common
if (!v->profile && v->extended_mv)
{
if (!v->profile && v->extended_mv) {
av_log(avctx, AV_LOG_ERROR,
"Extended MVs unavailable in Simple Profile\n");
return -1;
......@@ -345,8 +341,7 @@ int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitCo
v->vstransform = get_bits1(gb); //common
v->res_transtab = get_bits1(gb);
if (v->res_transtab)
{
if (v->res_transtab) {
av_log(avctx, AV_LOG_ERROR,
"1 for reserved RES_TRANSTAB is forbidden\n");
return -1;
......@@ -649,17 +644,14 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
v->rangeredfrm = 0;
if (v->rangered)
v->rangeredfrm = get_bits1(gb);
v->s.pict_type = get_bits1(gb);
if (v->s.avctx->max_b_frames) {
if (!v->s.pict_type) {
if (get_bits1(gb))
v->s.pict_type = AV_PICTURE_TYPE_I;
else
v->s.pict_type = AV_PICTURE_TYPE_B;
} else
if (get_bits1(gb)) {
v->s.pict_type = AV_PICTURE_TYPE_P;
} else {
if (v->s.avctx->max_b_frames && !get_bits1(gb)) {
v->s.pict_type = AV_PICTURE_TYPE_B;
} else
v->s.pict_type = v->s.pict_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
v->s.pict_type = AV_PICTURE_TYPE_I;
}
v->bi_type = 0;
if (v->s.pict_type == AV_PICTURE_TYPE_B) {
......@@ -689,19 +681,25 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
v->pq = ff_vc1_pquant_table[0][pqindex];
else
v->pq = ff_vc1_pquant_table[1][pqindex];
v->pquantizer = 1;
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pquantizer = pqindex < 9;
if (v->quantizer_mode == QUANT_NON_UNIFORM)
v->pquantizer = 0;
v->pqindex = pqindex;
if (pqindex < 9)
v->halfpq = get_bits1(gb);
else
v->halfpq = 0;
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
switch (v->quantizer_mode) {
case QUANT_FRAME_IMPLICIT:
v->pquantizer = pqindex < 9;
break;
case QUANT_NON_UNIFORM:
v->pquantizer = 0;
break;
case QUANT_FRAME_EXPLICIT:
v->pquantizer = get_bits1(gb);
break;
default:
v->pquantizer = 1;
break;
}
v->dquantfrm = 0;
if (v->extended_mv == 1)
v->mvrange = get_unary(gb, 0, 3);
......@@ -725,9 +723,7 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
switch (v->s.pict_type) {
case AV_PICTURE_TYPE_P:
if (v->pq < 5) v->tt_index = 0;
else if (v->pq < 13) v->tt_index = 1;
else v->tt_index = 2;
v->tt_index = (v->pq > 4) + (v->pq > 12);
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
......@@ -741,16 +737,15 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
INIT_LUT(v->lumscale, v->lumshift, v->last_luty[1], v->last_lutuv[1], 1);
}
v->qs_last = v->s.quarter_sample;
if (v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
v->s.quarter_sample = 0;
else if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
if (v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)
v->s.quarter_sample = 0;
else
v->s.quarter_sample = 1;
} else
v->s.quarter_sample = 1;
v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN || (v->mv_mode == MV_PMODE_INTENSITY_COMP && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));
if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
v->s.quarter_sample = (v->mv_mode2 != MV_PMODE_1MV_HPEL &&
v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
} else {
v->s.quarter_sample = (v->mv_mode != MV_PMODE_1MV_HPEL &&
v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
}
if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
v->mv_mode2 == MV_PMODE_MIXED_MV) ||
......@@ -779,21 +774,19 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
vop_dquant_decoding(v);
}
v->ttfrm = 0; //FIXME Is that so ?
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
}
} else
v->ttfrm = 0; //FIXME Is that so ?
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
case AV_PICTURE_TYPE_B:
if (v->pq < 5) v->tt_index = 0;
else if (v->pq < 13) v->tt_index = 1;
else v->tt_index = 2;
v->tt_index = (v->pq > 4) + (v->pq > 12);
v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
v->qs_last = v->s.quarter_sample;
......@@ -819,12 +812,12 @@ int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
vop_dquant_decoding(v);
}
v->ttfrm = 0;
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
}
} else
v->ttfrm = 0;
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
......@@ -859,11 +852,12 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
v->numref = 0;
v->p_frame_skipped = 0;
if (v->second_field) {
if(v->fcm!=2 || v->field_mode!=1)
if (v->fcm != ILACE_FIELD || v->field_mode!=1)
return -1;
v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
if (v->fptype & 4)
v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_BI : AV_PICTURE_TYPE_B;
else
v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
v->s.current_picture_ptr->f->pict_type = v->s.pict_type;
if (!v->pic_header_flag)
goto parse_common_info;
......@@ -889,10 +883,10 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
if (v->field_mode) {
v->s.mb_height = FFALIGN(v->s.height + 15 >> 4, 2);
v->fptype = get_bits(gb, 3);
v->s.pict_type = (v->fptype & 2) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
if (v->fptype & 4) // B-picture
v->s.pict_type = (v->fptype & 2) ? AV_PICTURE_TYPE_BI : AV_PICTURE_TYPE_B;
else
v->s.pict_type = (v->fptype & 2) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
} else {
v->s.mb_height = v->s.height + 15 >> 4;
switch (get_unary(gb, 0, 4)) {
......@@ -974,24 +968,29 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
pqindex = get_bits(gb, 5);
if (!pqindex)
return -1;
v->pqindex = pqindex;
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pq = ff_vc1_pquant_table[0][pqindex];
else
v->pq = ff_vc1_pquant_table[1][pqindex];
v->pquantizer = 1;
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pquantizer = pqindex < 9;
if (v->quantizer_mode == QUANT_NON_UNIFORM)
v->pquantizer = 0;
v->pqindex = pqindex;
if (pqindex < 9)
v->halfpq = get_bits1(gb);
else
v->halfpq = 0;
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
switch (v->quantizer_mode) {
case QUANT_FRAME_IMPLICIT:
v->pquantizer = pqindex < 9;
break;
case QUANT_NON_UNIFORM:
v->pquantizer = 0;
break;
case QUANT_FRAME_EXPLICIT:
v->pquantizer = get_bits1(gb);
break;
default:
v->pquantizer = 1;
break;
}
if (v->postprocflag)
v->postproc = get_bits(gb, 2);
......@@ -1081,12 +1080,7 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
v->range_x = 1 << (v->k_x - 1);
v->range_y = 1 << (v->k_y - 1);
if (v->pq < 5)
v->tt_index = 0;
else if (v->pq < 13)
v->tt_index = 1;
else
v->tt_index = 2;
v->tt_index = (v->pq > 4) + (v->pq > 12);
if (v->fcm != ILACE_FRAME) {
int mvmode;
mvmode = get_unary(gb, 1, 4);
......@@ -1130,18 +1124,15 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
v->last_use_ic = 1;
}
v->qs_last = v->s.quarter_sample;
if (v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
v->s.quarter_sample = 0;
else if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
if (v->mv_mode2 == MV_PMODE_1MV_HPEL || v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN)
v->s.quarter_sample = 0;
else
v->s.quarter_sample = 1;
} else
v->s.quarter_sample = 1;
v->s.mspel = !(v->mv_mode == MV_PMODE_1MV_HPEL_BILIN
|| (v->mv_mode == MV_PMODE_INTENSITY_COMP
&& v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));
if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
v->s.quarter_sample = (v->mv_mode2 != MV_PMODE_1MV_HPEL &&
v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
} else {
v->s.quarter_sample = (v->mv_mode != MV_PMODE_1MV_HPEL &&
v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
}
}
if (v->fcm == PROGRESSIVE) { // progressive
if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
......@@ -1192,12 +1183,12 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
vop_dquant_decoding(v);
}
v->ttfrm = 0; //FIXME Is that so ?
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
}
} else
v->ttfrm = 0; //FIXME Is that so ?
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
......@@ -1220,12 +1211,7 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
v->range_x = 1 << (v->k_x - 1);
v->range_y = 1 << (v->k_y - 1);
if (v->pq < 5)
v->tt_index = 0;
else if (v->pq < 13)
v->tt_index = 1;
else
v->tt_index = 2;
v->tt_index = (v->pq > 4) + (v->pq > 12);
if (v->field_mode) {
int mvmode;
......@@ -1313,12 +1299,12 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
vop_dquant_decoding(v);
}
v->ttfrm = 0;
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
}
} else
v->ttfrm = 0;
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
......@@ -1344,11 +1330,10 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
vop_dquant_decoding(v);
}
v->bi_type = 0;
if (v->s.pict_type == AV_PICTURE_TYPE_BI) {
v->bi_type = (v->s.pict_type == AV_PICTURE_TYPE_BI);
if (v->bi_type)
v->s.pict_type = AV_PICTURE_TYPE_B;
v->bi_type = 1;
}
return 0;
}
......
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