/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * @brief IntraX8 (J-Frame) subdecoder, used by WMV2 and VC-1 */ #include "libavutil/avassert.h" #include "avcodec.h" #include "get_bits.h" #include "idctdsp.h" #include "mpegvideo.h" #include "msmpeg4data.h" #include "intrax8huf.h" #include "intrax8.h" #include "intrax8dsp.h" #define MAX_TABLE_DEPTH(table_bits, max_bits) ((max_bits+table_bits-1)/table_bits) #define DC_VLC_BITS 9 #define AC_VLC_BITS 9 #define OR_VLC_BITS 7 #define DC_VLC_MTD MAX_TABLE_DEPTH(DC_VLC_BITS, MAX_DC_VLC_BITS) #define AC_VLC_MTD MAX_TABLE_DEPTH(AC_VLC_BITS, MAX_AC_VLC_BITS) #define OR_VLC_MTD MAX_TABLE_DEPTH(OR_VLC_BITS, MAX_OR_VLC_BITS) static VLC j_ac_vlc[2][2][8]; //[quant<13],[intra/inter],[select] static VLC j_dc_vlc[2][8]; //[quant], [select] static VLC j_orient_vlc[2][4]; //[quant], [select] static av_cold void x8_vlc_init(void){ int i; int offset = 0; int sizeidx = 0; static const uint16_t sizes[8*4 + 8*2 + 2 + 4] = { 576, 548, 582, 618, 546, 616, 560, 642, 584, 582, 704, 664, 512, 544, 656, 640, 512, 648, 582, 566, 532, 614, 596, 648, 586, 552, 584, 590, 544, 578, 584, 624, 528, 528, 526, 528, 536, 528, 526, 544, 544, 512, 512, 528, 528, 544, 512, 544, 128, 128, 128, 128, 128, 128}; static VLC_TYPE table[28150][2]; #define init_ac_vlc(dst,src) \ dst.table = &table[offset]; \ dst.table_allocated = sizes[sizeidx]; \ offset += sizes[sizeidx++]; \ init_vlc(&dst, \ AC_VLC_BITS,77, \ &src[1],4,2, \ &src[0],4,2, \ INIT_VLC_USE_NEW_STATIC) //set ac tables for(i=0;i<8;i++){ init_ac_vlc( j_ac_vlc[0][0][i], x8_ac0_highquant_table[i][0] ); init_ac_vlc( j_ac_vlc[0][1][i], x8_ac1_highquant_table[i][0] ); init_ac_vlc( j_ac_vlc[1][0][i], x8_ac0_lowquant_table [i][0] ); init_ac_vlc( j_ac_vlc[1][1][i], x8_ac1_lowquant_table [i][0] ); } #undef init_ac_vlc //set dc tables #define init_dc_vlc(dst,src) \ dst.table = &table[offset]; \ dst.table_allocated = sizes[sizeidx]; \ offset += sizes[sizeidx++]; \ init_vlc(&dst, \ DC_VLC_BITS,34, \ &src[1],4,2, \ &src[0],4,2, \ INIT_VLC_USE_NEW_STATIC); for(i=0;i<8;i++){ init_dc_vlc( j_dc_vlc[0][i], x8_dc_highquant_table[i][0]); init_dc_vlc( j_dc_vlc[1][i], x8_dc_lowquant_table [i][0]); } #undef init_dc_vlc //set orient tables #define init_or_vlc(dst,src) \ dst.table = &table[offset]; \ dst.table_allocated = sizes[sizeidx]; \ offset += sizes[sizeidx++]; \ init_vlc(&dst, \ OR_VLC_BITS,12, \ &src[1],4,2, \ &src[0],4,2, \ INIT_VLC_USE_NEW_STATIC); for(i=0;i<2;i++){ init_or_vlc( j_orient_vlc[0][i], x8_orient_highquant_table[i][0]); } for(i=0;i<4;i++){ init_or_vlc( j_orient_vlc[1][i], x8_orient_lowquant_table [i][0]) } if (offset != sizeof(table)/sizeof(VLC_TYPE)/2) av_log(NULL, AV_LOG_ERROR, "table size %i does not match needed %i\n", (int)(sizeof(table)/sizeof(VLC_TYPE)/2), offset); } #undef init_or_vlc static void x8_reset_vlc_tables(IntraX8Context * w){ memset(w->j_dc_vlc,0,sizeof(w->j_dc_vlc)); memset(w->j_ac_vlc,0,sizeof(w->j_ac_vlc)); w->j_orient_vlc=NULL; } static inline void x8_select_ac_table(IntraX8Context * const w , int mode){ MpegEncContext * const s= w->s; int table_index; av_assert2(mode<4); if( w->j_ac_vlc[mode] ) return; table_index = get_bits(&s->gb, 3); w->j_ac_vlc[mode] = &j_ac_vlc[w->quant<13][mode>>1][table_index];//2 modes use same tables av_assert2(w->j_ac_vlc[mode]); } static inline int x8_get_orient_vlc(IntraX8Context * w){ MpegEncContext * const s= w->s; int table_index; if(!w->j_orient_vlc ){ table_index = get_bits(&s->gb, 1+(w->quant<13) ); w->j_orient_vlc = &j_orient_vlc[w->quant<13][table_index]; } return get_vlc2(&s->gb, w->j_orient_vlc->table, OR_VLC_BITS, OR_VLC_MTD); } #define extra_bits(eb) (eb) #define extra_run (0xFF<<8) #define extra_level (0x00<<8) #define run_offset(r) ((r)<<16) #define level_offset(l) ((l)<<24) static const uint32_t ac_decode_table[]={ /*46*/ extra_bits(3) | extra_run | run_offset(16) | level_offset( 0), /*47*/ extra_bits(3) | extra_run | run_offset(24) | level_offset( 0), /*48*/ extra_bits(2) | extra_run | run_offset( 4) | level_offset( 1), /*49*/ extra_bits(3) | extra_run | run_offset( 8) | level_offset( 1), /*50*/ extra_bits(5) | extra_run | run_offset(32) | level_offset( 0), /*51*/ extra_bits(4) | extra_run | run_offset(16) | level_offset( 1), /*52*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset( 4), /*53*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset( 8), /*54*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset(12), /*55*/ extra_bits(3) | extra_level | run_offset( 0) | level_offset(16), /*56*/ extra_bits(3) | extra_level | run_offset( 0) | level_offset(24), /*57*/ extra_bits(2) | extra_level | run_offset( 1) | level_offset( 3), /*58*/ extra_bits(3) | extra_level | run_offset( 1) | level_offset( 7), /*59*/ extra_bits(2) | extra_run | run_offset(16) | level_offset( 0), /*60*/ extra_bits(2) | extra_run | run_offset(20) | level_offset( 0), /*61*/ extra_bits(2) | extra_run | run_offset(24) | level_offset( 0), /*62*/ extra_bits(2) | extra_run | run_offset(28) | level_offset( 0), /*63*/ extra_bits(4) | extra_run | run_offset(32) | level_offset( 0), /*64*/ extra_bits(4) | extra_run | run_offset(48) | level_offset( 0), /*65*/ extra_bits(2) | extra_run | run_offset( 4) | level_offset( 1), /*66*/ extra_bits(3) | extra_run | run_offset( 8) | level_offset( 1), /*67*/ extra_bits(4) | extra_run | run_offset(16) | level_offset( 1), /*68*/ extra_bits(2) | extra_level | run_offset( 0) | level_offset( 4), /*69*/ extra_bits(3) | extra_level | run_offset( 0) | level_offset( 8), /*70*/ extra_bits(4) | extra_level | run_offset( 0) | level_offset(16), /*71*/ extra_bits(2) | extra_level | run_offset( 1) | level_offset( 3), /*72*/ extra_bits(3) | extra_level | run_offset( 1) | level_offset( 7), }; //extra_bits = 3bits; extra_run/level = 1 bit; run_offset = 6bits; level_offset = 5 bits; #undef extra_bits #undef extra_run #undef extra_level #undef run_offset #undef level_offset static void x8_get_ac_rlf(IntraX8Context * const w, const int mode, int * const run, int * const level, int * const final){ MpegEncContext * const s= w->s; int i,e; // x8_select_ac_table(w,mode); i = get_vlc2(&s->gb, w->j_ac_vlc[mode]->table, AC_VLC_BITS, AC_VLC_MTD); if(i<46){ //[0-45] int t,l; if(i<0){ (*level)=(*final)=//prevent 'may be used unilitialized' (*run)=64;//this would cause error exit in the ac loop return; } (*final) = t = (i>22); i-=23*t; /* i== 0-15 r=0-15 l=0 ;r=i& %01111 i==16-19 r=0-3 l=1 ;r=i& %00011 i==20-21 r=0-1 l=2 ;r=i& %00001 i==22 r=0 l=3 ;r=i& %00000 l=lut_l[i/2]={0,0,0,0,0,0,0,0,1,1,2,3}[i>>1];// 11 10'01 01'00 00'00 00'00 00'00 00 => 0xE50000 t=lut_mask[l]={0x0f,0x03,0x01,0x00}[l]; as i<256 the higher bits do not matter */ l=(0xE50000>>(i&(0x1E)))&3;/*0x1E or (~1) or ((i>>1)<<1)*/ t=(0x01030F>>(l<<3)); (*run) = i&t; (*level) = l; }else if(i<73){//[46-72] uint32_t sm; uint32_t mask; i-=46; sm=ac_decode_table[i]; e=get_bits(&s->gb,sm&0xF);sm>>=8;//3bits mask=sm&0xff;sm>>=8; //1bit (*run) =(sm&0xff) + (e&( mask));//6bits (*level)=(sm>>8) + (e&(~mask));//5bits (*final)=i>(58-46); }else if(i<75){//[73-74] static const uint8_t crazy_mix_runlevel[32]={ 0x22,0x32,0x33,0x53,0x23,0x42,0x43,0x63, 0x24,0x52,0x34,0x73,0x25,0x62,0x44,0x83, 0x26,0x72,0x35,0x54,0x27,0x82,0x45,0x64, 0x28,0x92,0x36,0x74,0x29,0xa2,0x46,0x84}; (*final)=!(i&1); e=get_bits(&s->gb,5);//get the extra bits (*run) =crazy_mix_runlevel[e]>>4; (*level)=crazy_mix_runlevel[e]&0x0F; }else{ (*level)=get_bits( &s->gb, 7-3*(i&1)); (*run) =get_bits( &s->gb, 6); (*final)=get_bits1(&s->gb); } return; } //static const uint8_t dc_extra_sbits[] ={0, 1,1, 1,1, 2,2, 3,3, 4,4, 5,5, 6,6, 7,7 }; static const uint8_t dc_index_offset[] ={ 0, 1,2, 3,4, 5,7, 9,13, 17,25, 33,49, 65,97, 129,193}; static int x8_get_dc_rlf(IntraX8Context * const w,int const mode, int * const level, int * const final){ MpegEncContext * const s= w->s; int i,e,c; av_assert2(mode<3); if( !w->j_dc_vlc[mode] ) { int table_index; table_index = get_bits(&s->gb, 3); //4 modes, same table w->j_dc_vlc[mode]= &j_dc_vlc[w->quant<13][table_index]; } i=get_vlc2(&s->gb, w->j_dc_vlc[mode]->table, DC_VLC_BITS, DC_VLC_MTD); /*(i>=17) {i-=17;final=1;}*/ c= i>16; (*final)=c; i-=17*c; if(i<=0){ (*level)=0; return -i; } c=(i+1)>>1;//hackish way to calculate dc_extra_sbits[] c-=c>1; e=get_bits(&s->gb,c);//get the extra bits i=dc_index_offset[i]+(e>>1); e= -(e & 1);//0,0xffffff (*level)= (i ^ e) - e;// (i^0)-0 , (i^0xff)-(-1) return 0; } //end of huffman static int x8_setup_spatial_predictor(IntraX8Context * const w, const int chroma){ MpegEncContext * const s= w->s; int range; int sum; int quant; w->dsp.setup_spatial_compensation(s->dest[chroma], s->sc.edge_emu_buffer, s->current_picture.f->linesize[chroma>0], &range, &sum, w->edges); if(chroma){ w->orient=w->chroma_orient; quant=w->quant_dc_chroma; }else{ quant=w->quant; } w->flat_dc=0; if(range < quant || range < 3){ w->orient=0; if(range < 3){//yep you read right, a +-1 idct error may break decoding! w->flat_dc=1; sum+=9; w->predicted_dc = (sum*6899)>>17;//((1<<17)+9)/(8+8+1+2)=6899 } } if(chroma) return 0; av_assert2(w->orient < 3); if(range < 2*w->quant){ if( (w->edges&3) == 0){ if(w->orient==1) w->orient=11; if(w->orient==2) w->orient=10; }else{ w->orient=0; } w->raw_orient=0; }else{ static const uint8_t prediction_table[3][12]={ {0,8,4, 10,11, 2,6,9,1,3,5,7}, {4,0,8, 11,10, 3,5,2,6,9,1,7}, {8,0,4, 10,11, 1,7,2,6,9,3,5} }; w->raw_orient=x8_get_orient_vlc(w); if(w->raw_orient<0) return -1; av_assert2(w->raw_orient < 12 ); av_assert2(w->orient<3); w->orient=prediction_table[w->orient][w->raw_orient]; } return 0; } static void x8_update_predictions(IntraX8Context * const w, const int orient, const int est_run ){ MpegEncContext * const s= w->s; w->prediction_table[s->mb_x*2+(s->mb_y&1)] = (est_run<<2) + 1*(orient==4) + 2*(orient==8); /* y=2n+0 ->//0 2 4 y=2n+1 ->//1 3 5 */ } static void x8_get_prediction_chroma(IntraX8Context * const w){ MpegEncContext * const s= w->s; w->edges = 1*( !(s->mb_x>>1) ); w->edges|= 2*( !(s->mb_y>>1) ); w->edges|= 4*( s->mb_x >= (2*s->mb_width-1) );//mb_x for chroma would always be odd w->raw_orient=0; if(w->edges&3){//lut_co[8]={inv,4,8,8, inv,4,8,8}<- =>{1,1,0,0;1,1,0,0} => 0xCC w->chroma_orient=4<<((0xCC>>w->edges)&1); return; } w->chroma_orient = (w->prediction_table[2*s->mb_x-2] & 0x03)<<2;//block[x-1][y|1-1)] } static void x8_get_prediction(IntraX8Context * const w){ MpegEncContext * const s= w->s; int a,b,c,i; w->edges = 1*( !s->mb_x ); w->edges|= 2*( !s->mb_y ); w->edges|= 4*( s->mb_x >= (2*s->mb_width-1) ); switch(w->edges&3){ case 0: break; case 1: //take the one from the above block[0][y-1] w->est_run = w->prediction_table[!(s->mb_y&1)]>>2; w->orient = 1; return; case 2: //take the one from the previous block[x-1][0] w->est_run = w->prediction_table[2*s->mb_x-2]>>2; w->orient = 2; return; case 3: w->est_run = 16; w->orient = 0; return; } //no edge cases b= w->prediction_table[2*s->mb_x + !(s->mb_y&1) ];//block[x ][y-1] a= w->prediction_table[2*s->mb_x-2 + (s->mb_y&1) ];//block[x-1][y ] c= w->prediction_table[2*s->mb_x-2 + !(s->mb_y&1) ];//block[x-1][y-1] w->est_run = FFMIN(b,a); /* This condition has nothing to do with w->edges, even if it looks similar it would trigger if e.g. x=3;y=2; I guess somebody wrote something wrong and it became standard. */ if( (s->mb_x & s->mb_y) != 0 ) w->est_run=FFMIN(c,w->est_run); w->est_run>>=2; a&=3; b&=3; c&=3; i=( 0xFFEAF4C4>>(2*b+8*a) )&3; if(i!=3) w->orient=i; else w->orient=( 0xFFEAD8>>(2*c+8*(w->quant>12)) )&3; /* lut1[b][a]={ ->{0, 1, 0, pad}, {0, 1, X, pad}, {2, 2, 2, pad}} pad 2 2 2; pad X 1 0; pad 0 1 0 <- -> 11 10 '10 10 '11 11'01 00 '11 00'01 00=>0xEAF4C4 lut2[q>12][c]={ ->{0,2,1,pad}, {2,2,2,pad}} pad 2 2 2; pad 1 2 0 <- -> 11 10'10 10 '11 01'10 00=>0xEAD8 */ } static void x8_ac_compensation(IntraX8Context * const w, int const direction, int const dc_level){ MpegEncContext * const s= w->s; int t; #define B(x,y) s->block[0][w->idct_permutation[(x)+(y)*8]] #define T(x) ((x) * dc_level + 0x8000) >> 16; switch(direction){ case 0: t = T(3811);//h B(1,0) -= t; B(0,1) -= t; t = T(487);//e B(2,0) -= t; B(0,2) -= t; t = T(506);//f B(3,0) -= t; B(0,3) -= t; t = T(135);//c B(4,0) -= t; B(0,4) -= t; B(2,1) += t; B(1,2) += t; B(3,1) += t; B(1,3) += t; t = T(173);//d B(5,0) -= t; B(0,5) -= t; t = T(61);//b B(6,0) -= t; B(0,6) -= t; B(5,1) += t; B(1,5) += t; t = T(42); //a B(7,0) -= t; B(0,7) -= t; B(4,1) += t; B(1,4) += t; B(4,4) += t; t = T(1084);//g B(1,1) += t; s->block_last_index[0] = FFMAX(s->block_last_index[0], 7*8); break; case 1: B(0,1) -= T(6269); B(0,3) -= T( 708); B(0,5) -= T( 172); B(0,7) -= T( 73); s->block_last_index[0] = FFMAX(s->block_last_index[0], 7*8); break; case 2: B(1,0) -= T(6269); B(3,0) -= T( 708); B(5,0) -= T( 172); B(7,0) -= T( 73); s->block_last_index[0] = FFMAX(s->block_last_index[0], 7); break; } #undef B #undef T } static void dsp_x8_put_solidcolor(uint8_t const pix, uint8_t * dst, int const linesize){ int k; for(k=0;k<8;k++){ memset(dst,pix,8); dst+=linesize; } } static const int16_t quant_table[64] = { 256, 256, 256, 256, 256, 256, 259, 262, 265, 269, 272, 275, 278, 282, 285, 288, 292, 295, 299, 303, 306, 310, 314, 317, 321, 325, 329, 333, 337, 341, 345, 349, 353, 358, 362, 366, 371, 375, 379, 384, 389, 393, 398, 403, 408, 413, 417, 422, 428, 433, 438, 443, 448, 454, 459, 465, 470, 476, 482, 488, 493, 499, 505, 511 }; static int x8_decode_intra_mb(IntraX8Context* const w, const int chroma){ MpegEncContext * const s= w->s; uint8_t * scantable; int final,run,level; int ac_mode,dc_mode,est_run,dc_level; int pos,n; int zeros_only; int use_quant_matrix; int sign; av_assert2(w->orient<12); s->bdsp.clear_block(s->block[0]); if(chroma){ dc_mode=2; }else{ dc_mode=!!w->est_run;//0,1 } if(x8_get_dc_rlf(w, dc_mode, &dc_level, &final)) return -1; n=0; zeros_only=0; if(!final){//decode ac use_quant_matrix=w->use_quant_matrix; if(chroma){ ac_mode = 1; est_run = 64;//not used }else{ if (w->raw_orient < 3){ use_quant_matrix = 0; } if(w->raw_orient > 4){ ac_mode = 0; est_run = 64; }else{ if(w->est_run > 1){ ac_mode = 2; est_run=w->est_run; }else{ ac_mode = 3; est_run = 64; } } } x8_select_ac_table(w,ac_mode); /*scantable_selector[12]={0,2,0,1,1,1,0,2,2,0,1,2};<- -> 10'01' 00'10' 10'00' 01'01' 01'00' 10'00 =>0x928548 */ scantable = w->scantable[ (0x928548>>(2*w->orient))&3 ].permutated; pos=0; do { n++; if( n >= est_run ){ ac_mode=3; x8_select_ac_table(w,3); } x8_get_ac_rlf(w,ac_mode,&run,&level,&final); pos+=run+1; if(pos>63){ //this also handles vlc error in x8_get_ac_rlf return -1; } level= (level+1) * w->dquant; level+= w->qsum; sign = - get_bits1(&s->gb); level = (level ^ sign) - sign; if(use_quant_matrix){ level = (level*quant_table[pos])>>8; } s->block[0][ scantable[pos] ]=level; }while(!final); s->block_last_index[0]=pos; }else{//DC only s->block_last_index[0]=0; if(w->flat_dc && ((unsigned)(dc_level+1)) < 3){//[-1;1] int32_t divide_quant= !chroma ? w->divide_quant_dc_luma: w->divide_quant_dc_chroma; int32_t dc_quant = !chroma ? w->quant: w->quant_dc_chroma; //original intent dc_level+=predicted_dc/quant; but it got lost somewhere in the rounding dc_level+= (w->predicted_dc*divide_quant + (1<<12) )>>13; dsp_x8_put_solidcolor( av_clip_uint8((dc_level*dc_quant+4)>>3), s->dest[chroma], s->current_picture.f->linesize[!!chroma]); goto block_placed; } zeros_only = (dc_level == 0); } if(!chroma){ s->block[0][0] = dc_level*w->quant; }else{ s->block[0][0] = dc_level*w->quant_dc_chroma; } //there is !zero_only check in the original, but dc_level check is enough if( (unsigned int)(dc_level+1) >= 3 && (w->edges&3) != 3 ){ int direction; /*ac_comp_direction[orient] = { 0, 3, 3, 1, 1, 0, 0, 0, 2, 2, 2, 1 };<- -> 01'10' 10'10' 00'00' 00'01' 01'11' 11'00 =>0x6A017C */ direction= (0x6A017C>>(w->orient*2))&3; if (direction != 3){ x8_ac_compensation(w, direction, s->block[0][0]);//modify block_last[] } } if(w->flat_dc){ dsp_x8_put_solidcolor(w->predicted_dc, s->dest[chroma], s->current_picture.f->linesize[!!chroma]); }else{ w->dsp.spatial_compensation[w->orient]( s->sc.edge_emu_buffer, s->dest[chroma], s->current_picture.f->linesize[!!chroma] ); } if(!zeros_only) w->wdsp.idct_add(s->dest[chroma], s->current_picture.f->linesize[!!chroma], s->block[0]); block_placed: if(!chroma){ x8_update_predictions(w,w->orient,n); } if(s->loop_filter){ uint8_t* ptr = s->dest[chroma]; int linesize = s->current_picture.f->linesize[!!chroma]; if(!( (w->edges&2) || ( zeros_only && (w->orient|4)==4 ) )){ w->dsp.h_loop_filter(ptr, linesize, w->quant); } if(!( (w->edges&1) || ( zeros_only && (w->orient|8)==8 ) )){ w->dsp.v_loop_filter(ptr, linesize, w->quant); } } return 0; } static void x8_init_block_index(MpegEncContext *s){ //FIXME maybe merge with ff_* //not s->linesize as this would be wrong for field pics //not that IntraX8 has interlacing support ;) const int linesize = s->current_picture.f->linesize[0]; const int uvlinesize = s->current_picture.f->linesize[1]; s->dest[0] = s->current_picture.f->data[0]; s->dest[1] = s->current_picture.f->data[1]; s->dest[2] = s->current_picture.f->data[2]; s->dest[0] += s->mb_y * linesize << 3; s->dest[1] += ( s->mb_y&(~1) ) * uvlinesize << 2;//chroma blocks are on add rows s->dest[2] += ( s->mb_y&(~1) ) * uvlinesize << 2; } /** * Initialize IntraX8 frame decoder. * Requires valid MpegEncContext with valid s->mb_width before calling. * @param w pointer to IntraX8Context * @param s pointer to MpegEncContext of the parent codec */ av_cold void ff_intrax8_common_init(IntraX8Context * w, MpegEncContext * const s){ w->s=s; x8_vlc_init(); av_assert0(s->mb_width>0); w->prediction_table=av_mallocz(s->mb_width*2*2);//two rows, 2 blocks per cannon mb ff_wmv2dsp_init(&w->wdsp); ff_init_scantable_permutation(w->idct_permutation, w->wdsp.idct_perm); ff_init_scantable(w->idct_permutation, &w->scantable[0], ff_wmv1_scantable[0]); ff_init_scantable(w->idct_permutation, &w->scantable[1], ff_wmv1_scantable[2]); ff_init_scantable(w->idct_permutation, &w->scantable[2], ff_wmv1_scantable[3]); ff_intrax8dsp_init(&w->dsp); } /** * Destroy IntraX8 frame structure. * @param w pointer to IntraX8Context */ av_cold void ff_intrax8_common_end(IntraX8Context * w) { av_freep(&w->prediction_table); } /** * Decode single IntraX8 frame. * The parent codec must fill s->loopfilter and s->gb (bitstream). * The parent codec must call ff_mpv_frame_start() before calling this function. * The parent codec must call ff_mpv_frame_end() after calling this function. * This function does not use ff_mpv_decode_mb(). * lowres decoding is theoretically impossible. * @param w pointer to IntraX8Context * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1. * @param quant_offset offset away from zero */ int ff_intrax8_decode_picture(IntraX8Context * const w, int dquant, int quant_offset){ MpegEncContext * const s= w->s; int mb_xy; w->use_quant_matrix = get_bits1(&s->gb); w->dquant = dquant; w->quant = dquant >> 1; w->qsum = quant_offset; w->divide_quant_dc_luma = ((1<<16) + (w->quant>>1)) / w->quant; if(w->quant < 5){ w->quant_dc_chroma = w->quant; w->divide_quant_dc_chroma = w->divide_quant_dc_luma; }else{ w->quant_dc_chroma = w->quant+((w->quant+3)>>3); w->divide_quant_dc_chroma = ((1<<16) + (w->quant_dc_chroma>>1)) / w->quant_dc_chroma; } x8_reset_vlc_tables(w); for(s->mb_y=0; s->mb_y < s->mb_height*2; s->mb_y++){ x8_init_block_index(s); mb_xy=(s->mb_y>>1)*s->mb_stride; for(s->mb_x=0; s->mb_x < s->mb_width*2; s->mb_x++){ x8_get_prediction(w); if(x8_setup_spatial_predictor(w,0)) goto error; if(x8_decode_intra_mb(w,0)) goto error; if( s->mb_x & s->mb_y & 1 ){ x8_get_prediction_chroma(w); /*when setting up chroma, no vlc is read, so no error condition can be reached*/ x8_setup_spatial_predictor(w,1); if(x8_decode_intra_mb(w,1)) goto error; x8_setup_spatial_predictor(w,2); if(x8_decode_intra_mb(w,2)) goto error; s->dest[1]+= 8; s->dest[2]+= 8; /*emulate MB info in the relevant tables*/ s->mbskip_table [mb_xy]=0; s->mbintra_table[mb_xy]=1; s->current_picture.qscale_table[mb_xy] = w->quant; mb_xy++; } s->dest[0]+= 8; } if(s->mb_y&1){ ff_mpeg_draw_horiz_band(s, (s->mb_y-1)*8, 16); } } error: return 0; }