📄 vc1.c
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if(v->bfraction == 0) {
v->s.pict_type = BI_TYPE;
}
}
if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
skip_bits(gb, 7); // skip buffer fullness
/* calculate RND */
if(v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
v->rnd = 1;
if(v->s.pict_type == P_TYPE)
v->rnd ^= 1;
/* Quantizer stuff */
pqindex = get_bits(gb, 5);
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)
v->pquantizer = get_bits1(gb);
v->dquantfrm = 0;
if (v->extended_mv == 1) v->mvrange = get_unary(gb, 0, 3);
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
v->range_x = 1 << (v->k_x - 1);
v->range_y = 1 << (v->k_y - 1);
if (v->profile == PROFILE_ADVANCED)
{
if (v->postprocflag) v->postproc = get_bits1(gb);
}
else
if (v->multires && v->s.pict_type != B_TYPE) v->respic = get_bits(gb, 2);
if(v->res_x8 && (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)){
if(get_bits1(gb))return -1;
}
//av_log(v->s.avctx, AV_LOG_INFO, "%c Frame: QP=[%i]%i (+%i/2) %i\n",
// (v->s.pict_type == P_TYPE) ? 'P' : ((v->s.pict_type == I_TYPE) ? 'I' : 'B'), pqindex, v->pq, v->halfpq, v->rangeredfrm);
if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;
switch(v->s.pict_type) {
case P_TYPE:
if (v->pq < 5) v->tt_index = 0;
else if(v->pq < 13) v->tt_index = 1;
else v->tt_index = 2;
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{
int scale, shift, i;
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
v->use_ic = 1;
/* fill lookup tables for intensity compensation */
if(!v->lumscale) {
scale = -64;
shift = (255 - v->lumshift * 2) << 6;
if(v->lumshift > 31)
shift += 128 << 6;
} else {
scale = v->lumscale + 32;
if(v->lumshift > 31)
shift = (v->lumshift - 64) << 6;
else
shift = v->lumshift << 6;
}
for(i = 0; i < 256; i++) {
v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);
v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
}
}
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->mv_mode2 == MV_PMODE_MIXED_MV)
|| v->mv_mode == MV_PMODE_MIXED_MV)
{
status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
} else {
v->mv_type_is_raw = 0;
memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);
}
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
/* Hopefully this is correct for P frames */
v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables
v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];
if (v->dquant)
{
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
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->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
case B_TYPE:
if (v->pq < 5) v->tt_index = 0;
else if(v->pq < 13) v->tt_index = 1;
else v->tt_index = 2;
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);
v->s.mspel = v->s.quarter_sample;
status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->s.mv_table_index = get_bits(gb, 2);
v->cbpcy_vlc = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];
if (v->dquant)
{
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
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->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
}
/* AC Syntax */
v->c_ac_table_index = decode012(gb);
if (v->s.pict_type == I_TYPE || v->s.pict_type == BI_TYPE)
{
v->y_ac_table_index = decode012(gb);
}
/* DC Syntax */
v->s.dc_table_index = get_bits1(gb);
if(v->s.pict_type == BI_TYPE) {
v->s.pict_type = B_TYPE;
v->bi_type = 1;
}
return 0;
}
static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
{
int pqindex, lowquant;
int status;
v->p_frame_skipped = 0;
if(v->interlace){
v->fcm = decode012(gb);
if(v->fcm) return -1; // interlaced frames/fields are not implemented
}
switch(get_unary(gb, 0, 4)) {
case 0:
v->s.pict_type = P_TYPE;
break;
case 1:
v->s.pict_type = B_TYPE;
break;
case 2:
v->s.pict_type = I_TYPE;
break;
case 3:
v->s.pict_type = BI_TYPE;
break;
case 4:
v->s.pict_type = P_TYPE; // skipped pic
v->p_frame_skipped = 1;
return 0;
}
if(v->tfcntrflag)
skip_bits(gb, 8);
if(v->broadcast) {
if(!v->interlace || v->psf) {
v->rptfrm = get_bits(gb, 2);
} else {
v->tff = get_bits1(gb);
v->rptfrm = get_bits1(gb);
}
}
if(v->panscanflag) {
//...
}
v->rnd = get_bits1(gb);
if(v->interlace)
v->uvsamp = get_bits1(gb);
if(v->finterpflag) v->interpfrm = get_bits1(gb);
if(v->s.pict_type == B_TYPE) {
v->bfraction = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
v->bfraction = ff_vc1_bfraction_lut[v->bfraction];
if(v->bfraction == 0) {
v->s.pict_type = BI_TYPE; /* XXX: should not happen here */
}
}
pqindex = get_bits(gb, 5);
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)
v->pquantizer = get_bits1(gb);
if(v->s.pict_type == I_TYPE || v->s.pict_type == P_TYPE) v->use_ic = 0;
switch(v->s.pict_type) {
case I_TYPE:
case BI_TYPE:
status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->condover = CONDOVER_NONE;
if(v->overlap && v->pq <= 8) {
v->condover = decode012(gb);
if(v->condover == CONDOVER_SELECT) {
status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
}
}
break;
case P_TYPE:
if(v->postprocflag)
v->postproc = get_bits1(gb);
if (v->extended_mv) v->mvrange = get_unary(gb, 0, 3);
else v->mvrange = 0;
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
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;
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{
int scale, shift, i;
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
/* fill lookup tables for intensity compensation */
if(!v->lumscale) {
scale = -64;
shift = (255 - v->lumshift * 2) << 6;
if(v->lumshift > 31)
shift += 128 << 6;
} else {
scale = v->lumscale + 32;
if(v->lumshift > 31)
shift = (v->lumshift - 64) << 6;
else
shift = v->lumshift << 6;
}
for(i = 0; i < 256; i++) {
v->luty[i] = av_clip_uint8((scale * i + shift + 32) >> 6);
v->lutuv[i] = av_clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
}
v->use_ic = 1;
}
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->mv_mode2 == MV_PMODE_MIXED_MV)
|| v->mv_mode == MV_PMODE_MIXED_MV)
{
status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
} else {
v->mv_type_is_raw = 0;
memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);
}
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0) return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
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