/* * Mpeg Layer-3 audio decoder * -------------------------- * copyright (c) 1995-1999 by Michael Hipp. * All rights reserved. See also 'README' * * Optimize-TODO: put short bands into the band-field without the stride * of 3 reals * Length-optimze: unify long and short band code where it is possible */ #if 0 #define L3_DEBUG 1 #endif #if 0 #define CUT_HF #endif # define REAL_MUL(x, y) ((x) * (y)) static real ispow[8207]; static real aa_ca[8],aa_cs[8]; static real COS1[12][6]; static real win[4][36]; static real win1[4][36]; static real gainpow2[256+118+4]; /* non static for external 3dnow functions */ real COS9[9]; static real COS6_1,COS6_2; real tfcos36[9]; static real tfcos12[3]; #define NEW_DCT9 #ifdef NEW_DCT9 static real cos9[3],cos18[3]; #endif struct bandInfoStruct { int longIdx[23]; int longDiff[22]; int shortIdx[14]; int shortDiff[13]; }; static int longLimit[9][23]; static int shortLimit[9][14]; static struct bandInfoStruct bandInfo[9] = { /* MPEG 1.0 */ { {0,4,8,12,16,20,24,30,36,44,52,62,74, 90,110,134,162,196,238,288,342,418,576}, {4,4,4,4,4,4,6,6,8, 8,10,12,16,20,24,28,34,42,50,54, 76,158}, {0,4*3,8*3,12*3,16*3,22*3,30*3,40*3,52*3,66*3, 84*3,106*3,136*3,192*3}, {4,4,4,4,6,8,10,12,14,18,22,30,56} } , { {0,4,8,12,16,20,24,30,36,42,50,60,72, 88,106,128,156,190,230,276,330,384,576}, {4,4,4,4,4,4,6,6,6, 8,10,12,16,18,22,28,34,40,46,54, 54,192}, {0,4*3,8*3,12*3,16*3,22*3,28*3,38*3,50*3,64*3, 80*3,100*3,126*3,192*3}, {4,4,4,4,6,6,10,12,14,16,20,26,66} } , { {0,4,8,12,16,20,24,30,36,44,54,66,82,102,126,156,194,240,296,364,448,550,576} , {4,4,4,4,4,4,6,6,8,10,12,16,20,24,30,38,46,56,68,84,102, 26} , {0,4*3,8*3,12*3,16*3,22*3,30*3,42*3,58*3,78*3,104*3,138*3,180*3,192*3} , {4,4,4,4,6,8,12,16,20,26,34,42,12} } , /* MPEG 2.0 */ { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576}, {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 } , {0,4*3,8*3,12*3,18*3,24*3,32*3,42*3,56*3,74*3,100*3,132*3,174*3,192*3} , {4,4,4,6,6,8,10,14,18,26,32,42,18 } } , /* changed 19th value fropm 330 to 332 */ { {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,332,394,464,540,576}, {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,54,62,70,76,36 } , {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,136*3,180*3,192*3} , {4,4,4,6,8,10,12,14,18,24,32,44,12 } } , { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576}, {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 }, {0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,134*3,174*3,192*3}, {4,4,4,6,8,10,12,14,18,24,30,40,18 } } , /* MPEG 2.5 */ { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} , {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54}, {0,12,24,36,54,78,108,144,186,240,312,402,522,576}, {4,4,4,6,8,10,12,14,18,24,30,40,18} }, { {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} , {6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54}, {0,12,24,36,54,78,108,144,186,240,312,402,522,576}, {4,4,4,6,8,10,12,14,18,24,30,40,18} }, { {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576}, {12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2}, {0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576}, {8,8,8,12,16,20,24,28,36,2,2,2,26} } , }; static int mapbuf0[9][152]; static int mapbuf1[9][156]; static int mapbuf2[9][44]; static int *map[9][3]; static int *mapend[9][3]; static unsigned int n_slen2[512]; /* MPEG 2.0 slen for 'normal' mode */ static unsigned int i_slen2[256]; /* MPEG 2.0 slen for intensity stereo */ static real tan1_1[16],tan2_1[16],tan1_2[16],tan2_2[16]; static real pow1_1[2][16],pow2_1[2][16],pow1_2[2][16],pow2_2[2][16]; /* * init tables for layer-3 */ static void init_layer3(int down_sample_sblimit) { int i,j,k,l; for(i=-256;i<118+4;i++) { if(_has_mmx) gainpow2[i+256] = 16384.0 * pow((double)2.0,-0.25 * (double) (i+210) ); else gainpow2[i+256] = pow((double)2.0,-0.25 * (double) (i+210) ); } for(i=0;i<8207;i++) ispow[i] = pow((double)i,(double)4.0/3.0); for (i=0;i<8;i++) { static double Ci[8]={-0.6,-0.535,-0.33,-0.185,-0.095,-0.041,-0.0142,-0.0037}; double sq=sqrt(1.0+Ci[i]*Ci[i]); aa_cs[i] = 1.0/sq; aa_ca[i] = Ci[i]/sq; } for(i=0;i<18;i++) { win[0][i] = win[1][i] = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+0) +1) ) / cos ( M_PI * (double) (2*(i+0) +19) / 72.0 ); win[0][i+18] = win[3][i+18] = 0.5 * sin( M_PI / 72.0 * (double) (2*(i+18)+1) ) / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 ); } for(i=0;i<6;i++) { win[1][i+18] = 0.5 / cos ( M_PI * (double) (2*(i+18)+19) / 72.0 ); win[3][i+12] = 0.5 / cos ( M_PI * (double) (2*(i+12)+19) / 72.0 ); win[1][i+24] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+13) ) / cos ( M_PI * (double) (2*(i+24)+19) / 72.0 ); win[1][i+30] = win[3][i] = 0.0; win[3][i+6 ] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*(i+6 )+19) / 72.0 ); } for(i=0;i<9;i++) COS9[i] = cos( M_PI / 18.0 * (double) i); for(i=0;i<9;i++) tfcos36[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 36.0 ); for(i=0;i<3;i++) tfcos12[i] = 0.5 / cos ( M_PI * (double) (i*2+1) / 12.0 ); COS6_1 = cos( M_PI / 6.0 * (double) 1); COS6_2 = cos( M_PI / 6.0 * (double) 2); #ifdef NEW_DCT9 cos9[0] = cos(1.0*M_PI/9.0); cos9[1] = cos(5.0*M_PI/9.0); cos9[2] = cos(7.0*M_PI/9.0); cos18[0] = cos(1.0*M_PI/18.0); cos18[1] = cos(11.0*M_PI/18.0); cos18[2] = cos(13.0*M_PI/18.0); #endif for(i=0;i<12;i++) { win[2][i] = 0.5 * sin( M_PI / 24.0 * (double) (2*i+1) ) / cos ( M_PI * (double) (2*i+7) / 24.0 ); for(j=0;j<6;j++) COS1[i][j] = cos( M_PI / 24.0 * (double) ((2*i+7)*(2*j+1)) ); } for(j=0;j<4;j++) { static int len[4] = { 36,36,12,36 }; for(i=0;i<len[j];i+=2) win1[j][i] = + win[j][i]; for(i=1;i<len[j];i+=2) win1[j][i] = - win[j][i]; } for(i=0;i<16;i++) { double t = tan( (double) i * M_PI / 12.0 ); tan1_1[i] = t / (1.0+t); tan2_1[i] = 1.0 / (1.0 + t); tan1_2[i] = M_SQRT2 * t / (1.0+t); tan2_2[i] = M_SQRT2 / (1.0 + t); for(j=0;j<2;j++) { double base = pow(2.0,-0.25*(j+1.0)); double p1=1.0,p2=1.0; if(i > 0) { if( i & 1 ) p1 = pow(base,(i+1.0)*0.5); else p2 = pow(base,i*0.5); } pow1_1[j][i] = p1; pow2_1[j][i] = p2; pow1_2[j][i] = M_SQRT2 * p1; pow2_2[j][i] = M_SQRT2 * p2; } } for(j=0;j<9;j++) { struct bandInfoStruct *bi = &bandInfo[j]; int *mp; int cb,lwin; int *bdf; mp = map[j][0] = mapbuf0[j]; bdf = bi->longDiff; for(i=0,cb = 0; cb < 8 ; cb++,i+=*bdf++) { *mp++ = (*bdf) >> 1; *mp++ = i; *mp++ = 3; *mp++ = cb; } bdf = bi->shortDiff+3; for(cb=3;cb<13;cb++) { int l = (*bdf++) >> 1; for(lwin=0;lwin<3;lwin++) { *mp++ = l; *mp++ = i + lwin; *mp++ = lwin; *mp++ = cb; } i += 6*l; } mapend[j][0] = mp; mp = map[j][1] = mapbuf1[j]; bdf = bi->shortDiff+0; for(i=0,cb=0;cb<13;cb++) { int l = (*bdf++) >> 1; for(lwin=0;lwin<3;lwin++) { *mp++ = l; *mp++ = i + lwin; *mp++ = lwin; *mp++ = cb; } i += 6*l; } mapend[j][1] = mp; mp = map[j][2] = mapbuf2[j]; bdf = bi->longDiff; for(cb = 0; cb < 22 ; cb++) { *mp++ = (*bdf++) >> 1; *mp++ = cb; } mapend[j][2] = mp; } for(j=0;j<9;j++) { for(i=0;i<23;i++) { longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1; if(longLimit[j][i] > (down_sample_sblimit) ) longLimit[j][i] = down_sample_sblimit; } for(i=0;i<14;i++) { shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1; if(shortLimit[j][i] > (down_sample_sblimit) ) shortLimit[j][i] = down_sample_sblimit; } } for(i=0;i<5;i++) { for(j=0;j<6;j++) { for(k=0;k<6;k++) { int n = k + j * 6 + i * 36; i_slen2[n] = i|(j<<3)|(k<<6)|(3<<12); } } } for(i=0;i<4;i++) { for(j=0;j<4;j++) { for(k=0;k<4;k++) { int n = k + j * 4 + i * 16; i_slen2[n+180] = i|(j<<3)|(k<<6)|(4<<12); } } } for(i=0;i<4;i++) { for(j=0;j<3;j++) { int n = j + i * 3; i_slen2[n+244] = i|(j<<3) | (5<<12); n_slen2[n+500] = i|(j<<3) | (2<<12) | (1<<15); } } for(i=0;i<5;i++) { for(j=0;j<5;j++) { for(k=0;k<4;k++) { for(l=0;l<4;l++) { int n = l + k * 4 + j * 16 + i * 80; n_slen2[n] = i|(j<<3)|(k<<6)|(l<<9)|(0<<12); } } } } for(i=0;i<5;i++) { for(j=0;j<5;j++) { for(k=0;k<4;k++) { int n = k + j * 4 + i * 20; n_slen2[n+400] = i|(j<<3)|(k<<6)|(1<<12); } } } } /* * read additional side information (for MPEG 1 and MPEG 2) */ static int III_get_side_info(struct III_sideinfo *si,int stereo, int ms_stereo,long sfreq,int single,int lsf) { int ch, gr; int powdiff = (single == 3) ? 4 : 0; static const int tabs[2][5] = { { 2,9,5,3,4 } , { 1,8,1,2,9 } }; const int *tab = tabs[lsf]; si->main_data_begin = getbits(tab[1]); if (stereo == 1) si->private_bits = getbits_fast(tab[2]); else si->private_bits = getbits_fast(tab[3]); if(!lsf) { for (ch=0; ch<stereo; ch++) { si->ch[ch].gr[0].scfsi = -1; si->ch[ch].gr[1].scfsi = getbits_fast(4); } } for (gr=0; gr<tab[0]; gr++) { for (ch=0; ch<stereo; ch++) { register struct gr_info_s *gr_info = &(si->ch[ch].gr[gr]); gr_info->part2_3_length = getbits(12); gr_info->big_values = getbits(9); if(gr_info->big_values > 288) { fprintf(stderr,"big_values too large!\n"); gr_info->big_values = 288; } gr_info->pow2gain = gainpow2+256 - getbits_fast(8) + powdiff; if(ms_stereo) gr_info->pow2gain += 2; gr_info->scalefac_compress = getbits(tab[4]); if(get1bit()) { /* window switch flag */ int i; #ifdef L3_DEBUG if(2*gr_info->big_values > bandInfo[sfreq].shortIdx[12]) fprintf(stderr,"L3: BigValues too large, doesn't make sense %d %d\n",2*gr_info->big_values,bandInfo[sfreq].shortIdx[12]); #endif gr_info->block_type = getbits_fast(2); gr_info->mixed_block_flag = get1bit(); gr_info->table_select[0] = getbits_fast(5); gr_info->table_select[1] = getbits_fast(5); /* * table_select[2] not needed, because there is no region2, * but to satisfy some verifications tools we set it either. */ gr_info->table_select[2] = 0; for(i=0;i<3;i++) gr_info->full_gain[i] = gr_info->pow2gain + (getbits_fast(3)<<3); if(gr_info->block_type == 0) { fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n"); return 0; } /* region_count/start parameters are implicit in this case. */ if(!lsf || gr_info->block_type == 2) gr_info->region1start = 36>>1; else { /* check this again for 2.5 and sfreq=8 */ if(sfreq == 8) gr_info->region1start = 108>>1; else gr_info->region1start = 54>>1; } gr_info->region2start = 576>>1; } else { int i,r0c,r1c; #ifdef L3_DEBUG if(2*gr_info->big_values > bandInfo[sfreq].longIdx[21]) fprintf(stderr,"L3: BigValues too large, doesn't make sense %d %d\n",2*gr_info->big_values,bandInfo[sfreq].longIdx[21]); #endif for (i=0; i<3; i++) gr_info->table_select[i] = getbits_fast(5); r0c = getbits_fast(4); r1c = getbits_fast(3); gr_info->region1start = bandInfo[sfreq].longIdx[r0c+1] >> 1 ; if(r0c + r1c + 2 > 22) gr_info->region2start = 576>>1; else gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1; gr_info->block_type = 0; gr_info->mixed_block_flag = 0; } if(!lsf) gr_info->preflag = get1bit(); gr_info->scalefac_scale = get1bit(); gr_info->count1table_select = get1bit(); } } return !0; } /* * read scalefactors */ static int III_get_scale_factors_1(int *scf,struct gr_info_s *gr_info) { static const unsigned char slen[2][16] = { {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4}, {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3} }; int numbits; int num0 = slen[0][gr_info->scalefac_compress]; int num1 = slen[1][gr_info->scalefac_compress]; if (gr_info->block_type == 2) { int i=18; numbits = (num0 + num1) * 18; if (gr_info->mixed_block_flag) { for (i=8;i;i--) *scf++ = getbits_fast(num0); i = 9; numbits -= num0; /* num0 * 17 + num1 * 18 */ } for (;i;i--) *scf++ = getbits_fast(num0); for (i = 18; i; i--) *scf++ = getbits_fast(num1); *scf++ = 0; *scf++ = 0; *scf++ = 0; /* short[13][0..2] = 0 */ } else { int i; int scfsi = gr_info->scfsi; if(scfsi < 0) { /* scfsi < 0 => granule == 0 */ for(i=11;i;i--) *scf++ = getbits_fast(num0); for(i=10;i;i--) *scf++ = getbits_fast(num1); numbits = (num0 + num1) * 10 + num0; *scf++ = 0; } else { numbits = 0; if(!(scfsi & 0x8)) { for (i=0;i<6;i++) *scf++ = getbits_fast(num0); numbits += num0 * 6; } else { scf += 6; } if(!(scfsi & 0x4)) { for (i=0;i<5;i++) *scf++ = getbits_fast(num0); numbits += num0 * 5; } else { scf += 5; } if(!(scfsi & 0x2)) { for(i=0;i<5;i++) *scf++ = getbits_fast(num1); numbits += num1 * 5; } else { scf += 5; } if(!(scfsi & 0x1)) { for (i=0;i<5;i++) *scf++ = getbits_fast(num1); numbits += num1 * 5; } else { scf += 5; } *scf++ = 0; /* no l[21] in original sources */ } } return numbits; } static int III_get_scale_factors_2(int *scf,struct gr_info_s *gr_info,int i_stereo) { unsigned char *pnt; int i,j; unsigned int slen; int n = 0; int numbits = 0; static unsigned char stab[3][6][4] = { { { 6, 5, 5,5 } , { 6, 5, 7,3 } , { 11,10,0,0} , { 7, 7, 7,0 } , { 6, 6, 6,3 } , { 8, 8,5,0} } , { { 9, 9, 9,9 } , { 9, 9,12,6 } , { 18,18,0,0} , {12,12,12,0 } , {12, 9, 9,6 } , { 15,12,9,0} } , { { 6, 9, 9,9 } , { 6, 9,12,6 } , { 15,18,0,0} , { 6,15,12,0 } , { 6,12, 9,6 } , { 6,18,9,0} } }; if(i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */ slen = i_slen2[gr_info->scalefac_compress>>1]; else slen = n_slen2[gr_info->scalefac_compress]; gr_info->preflag = (slen>>15) & 0x1; n = 0; if( gr_info->block_type == 2 ) { n++; if(gr_info->mixed_block_flag) n++; } pnt = stab[n][(slen>>12)&0x7]; for(i=0;i<4;i++) { int num = slen & 0x7; slen >>= 3; if(num) { for(j=0;j<(int)(pnt[i]);j++) *scf++ = getbits_fast(num); numbits += pnt[i] * num; } else { for(j=0;j<(int)(pnt[i]);j++) *scf++ = 0; } } n = (n << 1) + 1; for(i=0;i<n;i++) *scf++ = 0; return numbits; } static int pretab1[22] = {0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,2,2,3,3,3,2,0}; static int pretab2[22] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; #define getbitoffset() ((-bitindex)&0x7) #define getbyte() (*wordpointer++) /* * Dequantize samples (includes huffman decoding) */ /* 24 is enough because tab13 has max. a 19 bit huffvector */ #define BITSHIFT ((sizeof(long)-1)*8) #define REFRESH_MASK \ while(num < BITSHIFT) { \ mask |= ((unsigned long)getbyte())<<(BITSHIFT-num); \ num += 8; \ part2remain -= 8; } static int III_dequantize_sample(real xr[SBLIMIT][SSLIMIT],int *scf, struct gr_info_s *gr_info,int sfreq,int part2bits) { int shift = 1 + gr_info->scalefac_scale; real *xrpnt = (real *) xr; int l[3],l3; int part2remain = gr_info->part2_3_length - part2bits; int *me; int num=getbitoffset(); long mask; /* we must split this, because for num==0 the shift is undefined if you do it in one step */ mask = ((unsigned long) getbits(num))<<BITSHIFT; mask <<= 8-num; part2remain -= num; { int bv = gr_info->big_values; int region1 = gr_info->region1start; int region2 = gr_info->region2start; l3 = ((576>>1)-bv)>>1; /* * we may lose the 'odd' bit here !! * check this later again */ if(bv <= region1) { l[0] = bv; l[1] = l[2] = 0; } else { l[0] = region1; if(bv <= region2) { l[1] = bv - l[0]; l[2] = 0; } else { l[1] = region2 - l[0]; l[2] = bv - region2; } } } if(gr_info->block_type == 2) { /* * decoding with short or mixed mode BandIndex table */ int i,max[4]; int step=0,lwin=3,cb=0; register real v = 0.0; register int *m,mc; if(gr_info->mixed_block_flag) { max[3] = -1; max[0] = max[1] = max[2] = 2; m = map[sfreq][0]; me = mapend[sfreq][0]; } else { max[0] = max[1] = max[2] = max[3] = -1; /* max[3] not really needed in this case */ m = map[sfreq][1]; me = mapend[sfreq][1]; } mc = 0; for(i=0;i<2;i++) { int lp = l[i]; struct newhuff *h = ht+gr_info->table_select[i]; for(;lp;lp--,mc--) { register int x,y; if( (!mc) ) { mc = *m++; xrpnt = ((real *) xr) + (*m++); lwin = *m++; cb = *m++; if(lwin == 3) { v = gr_info->pow2gain[(*scf++) << shift]; step = 1; } else { v = gr_info->full_gain[lwin][(*scf++) << shift]; step = 3; } } { register short *val = h->table; REFRESH_MASK; while((y=*val++)<0) { if (mask < 0) val -= y; num--; mask <<= 1; } x = y >> 4; y &= 0xf; } if(x == 15 && h->linbits) { max[lwin] = cb; REFRESH_MASK; x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits); num -= h->linbits+1; mask <<= h->linbits; if(mask < 0) *xrpnt = REAL_MUL(-ispow[x], v); else *xrpnt = REAL_MUL(ispow[x], v); mask <<= 1; } else if(x) { max[lwin] = cb; if(mask < 0) *xrpnt = REAL_MUL(-ispow[x], v); else *xrpnt = REAL_MUL(ispow[x], v); num--; mask <<= 1; } else *xrpnt = 0.0; xrpnt += step; if(y == 15 && h->linbits) { max[lwin] = cb; REFRESH_MASK; y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits); num -= h->linbits+1; mask <<= h->linbits; if(mask < 0) *xrpnt = REAL_MUL(-ispow[y], v); else *xrpnt = REAL_MUL(ispow[y], v); mask <<= 1; } else if(y) { max[lwin] = cb; if(mask < 0) *xrpnt = REAL_MUL(-ispow[y], v); else *xrpnt = REAL_MUL(ispow[y], v); num--; mask <<= 1; } else *xrpnt = 0.0; xrpnt += step; } } for(;l3 && (part2remain+num > 0);l3--) { struct newhuff *h = htc+gr_info->count1table_select; register short *val = h->table,a; REFRESH_MASK; while((a=*val++)<0) { if (mask < 0) val -= a; num--; mask <<= 1; } if(part2remain+num <= 0) { num -= part2remain+num; break; } for(i=0;i<4;i++) { if(!(i & 1)) { if(!mc) { mc = *m++; xrpnt = ((real *) xr) + (*m++); lwin = *m++; cb = *m++; if(lwin == 3) { v = gr_info->pow2gain[(*scf++) << shift]; step = 1; } else { v = gr_info->full_gain[lwin][(*scf++) << shift]; step = 3; } } mc--; } if( (a & (0x8>>i)) ) { max[lwin] = cb; if(part2remain+num <= 0) { break; } if(mask < 0) *xrpnt = -v; else *xrpnt = v; num--; mask <<= 1; } else *xrpnt = 0.0; xrpnt += step; } } if(lwin < 3) { /* short band? */ while(1) { for(;mc > 0;mc--) { *xrpnt = 0.0; xrpnt += 3; /* short band -> step=3 */ *xrpnt = 0.0; xrpnt += 3; } if(m >= me) break; mc = *m++; xrpnt = ((real *) xr) + *m++; if(*m++ == 0) break; /* optimize: field will be set to zero at the end of the function */ m++; /* cb */ } } gr_info->maxband[0] = max[0]+1; gr_info->maxband[1] = max[1]+1; gr_info->maxband[2] = max[2]+1; gr_info->maxbandl = max[3]+1; { int rmax = max[0] > max[1] ? max[0] : max[1]; rmax = (rmax > max[2] ? rmax : max[2]) + 1; gr_info->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3]+1]; } } else { /* * decoding with 'long' BandIndex table (block_type != 2) */ int *pretab = gr_info->preflag ? pretab1 : pretab2; int i,max = -1; int cb = 0; int *m = map[sfreq][2]; register real v = 0.0; int mc = 0; /* * long hash table values */ for(i=0;i<3;i++) { int lp = l[i]; struct newhuff *h = ht+gr_info->table_select[i]; for(;lp;lp--,mc--) { int x,y; if(!mc) { mc = *m++; cb = *m++; #ifdef CUT_HF if(cb == 21) { fprintf(stderr,"c"); v = 0.0; } else #endif v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; } { register short *val = h->table; REFRESH_MASK; while((y=*val++)<0) { if (mask < 0) val -= y; num--; mask <<= 1; } x = y >> 4; y &= 0xf; } if (x == 15 && h->linbits) { max = cb; REFRESH_MASK; x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits); num -= h->linbits+1; mask <<= h->linbits; if(mask < 0) *xrpnt++ = REAL_MUL(-ispow[x], v); else *xrpnt++ = REAL_MUL(ispow[x], v); mask <<= 1; } else if(x) { max = cb; if(mask < 0) *xrpnt++ = REAL_MUL(-ispow[x], v); else *xrpnt++ = REAL_MUL(ispow[x], v); num--; mask <<= 1; } else *xrpnt++ = 0.0; if (y == 15 && h->linbits) { max = cb; REFRESH_MASK; y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits); num -= h->linbits+1; mask <<= h->linbits; if(mask < 0) *xrpnt++ = REAL_MUL(-ispow[y], v); else *xrpnt++ = REAL_MUL(ispow[y], v); mask <<= 1; } else if(y) { max = cb; if(mask < 0) *xrpnt++ = REAL_MUL(-ispow[y], v); else *xrpnt++ = REAL_MUL(ispow[y], v); num--; mask <<= 1; } else *xrpnt++ = 0.0; } } /* * short (count1table) values */ for(;l3 && (part2remain+num > 0);l3--) { struct newhuff *h = htc+gr_info->count1table_select; register short *val = h->table,a; REFRESH_MASK; while((a=*val++)<0) { if (mask < 0) val -= a; num--; mask <<= 1; } if(part2remain+num <= 0) { num -= part2remain+num; break; } for(i=0;i<4;i++) { if(!(i & 1)) { if(!mc) { mc = *m++; cb = *m++; #ifdef CUT_HF if(cb == 21) { fprintf(stderr,"c"); v = 0.0; } else #endif v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; } mc--; } if ( (a & (0x8>>i)) ) { max = cb; if(part2remain+num <= 0) { break; } if(mask < 0) *xrpnt++ = -v; else *xrpnt++ = v; num--; mask <<= 1; } else *xrpnt++ = 0.0; } } gr_info->maxbandl = max+1; gr_info->maxb = longLimit[sfreq][gr_info->maxbandl]; } part2remain += num; // backbits(num); bitindex -= num; wordpointer += (bitindex>>3); bitindex &= 0x7; num = 0; while(xrpnt < &xr[SBLIMIT][0]) *xrpnt++ = 0.0; while( part2remain > 16 ) { getbits(16); /* Dismiss stuffing Bits */ part2remain -= 16; } if(part2remain > 0) getbits(part2remain); else if(part2remain < 0) { fprintf(stderr,"mpg123: Can't rewind stream by %d bits!\n",-part2remain); return 1; /* -> error */ } return 0; } /* * III_stereo: calculate real channel values for Joint-I-Stereo-mode */ static void III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT],int *scalefac, struct gr_info_s *gr_info,int sfreq,int ms_stereo,int lsf) { real (*xr)[SBLIMIT*SSLIMIT] = (real (*)[SBLIMIT*SSLIMIT] ) xr_buf; struct bandInfoStruct *bi = &bandInfo[sfreq]; const real *tab1,*tab2; int tab; static const real *tabs[3][2][2] = { { { tan1_1,tan2_1 } , { tan1_2,tan2_2 } }, { { pow1_1[0],pow2_1[0] } , { pow1_2[0],pow2_2[0] } } , { { pow1_1[1],pow2_1[1] } , { pow1_2[1],pow2_2[1] } } }; tab = lsf + (gr_info->scalefac_compress & lsf); tab1 = tabs[tab][ms_stereo][0]; tab2 = tabs[tab][ms_stereo][1]; #if 0 if(lsf) { int p = gr_info->scalefac_compress & 0x1; if(ms_stereo) { tab1 = pow1_2[p]; tab2 = pow2_2[p]; } else { tab1 = pow1_1[p]; tab2 = pow2_1[p]; } } else { if(ms_stereo) { tab1 = tan1_2; tab2 = tan2_2; } else { tab1 = tan1_1; tab2 = tan2_1; } } #endif // printf("III_i_st: tab1=%p tab2=%p tab=%d ms=%d \n", tab1, tab2, tab, ms_stereo); if (gr_info->block_type == 2) { int lwin,do_l = 0; if( gr_info->mixed_block_flag ) do_l = 1; for (lwin=0;lwin<3;lwin++) { /* process each window */ /* get first band with zero values */ int is_p,sb,idx,sfb = gr_info->maxband[lwin]; /* sfb is minimal 3 for mixed mode */ if(sfb > 3) do_l = 0; for(;sfb<12;sfb++) { is_p = scalefac[sfb*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */ if(is_p != 7) { real t1,t2; sb = bi->shortDiff[sfb]; idx = bi->shortIdx[sfb] + lwin; t1 = tab1[is_p]; t2 = tab2[is_p]; for (; sb > 0; sb--,idx+=3) { real v = xr[0][idx]; xr[0][idx] = REAL_MUL(v, t1); xr[1][idx] = REAL_MUL(v, t2); } } } #if 1 /* in the original: copy 10 to 11 , here: copy 11 to 12 maybe still wrong??? (copy 12 to 13?) */ is_p = scalefac[11*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */ sb = bi->shortDiff[12]; idx = bi->shortIdx[12] + lwin; #else is_p = scalefac[10*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */ sb = bi->shortDiff[11]; idx = bi->shortIdx[11] + lwin; #endif if(is_p != 7) { real t1,t2; t1 = tab1[is_p]; t2 = tab2[is_p]; for ( ; sb > 0; sb--,idx+=3 ) { real v = xr[0][idx]; xr[0][idx] = REAL_MUL(v, t1); xr[1][idx] = REAL_MUL(v, t2); } } } /* end for(lwin; .. ; . ) */ /* also check l-part, if ALL bands in the three windows are 'empty' * and mode = mixed_mode */ if (do_l) { int sfb = gr_info->maxbandl; int idx = bi->longIdx[sfb]; for ( ; sfb<8; sfb++ ) { int sb = bi->longDiff[sfb]; int is_p = scalefac[sfb]; /* scale: 0-15 */ if(is_p != 7) { real t1,t2; t1 = tab1[is_p]; t2 = tab2[is_p]; for ( ; sb > 0; sb--,idx++) { real v = xr[0][idx]; xr[0][idx] = REAL_MUL(v, t1); xr[1][idx] = REAL_MUL(v, t2); } } else idx += sb; } } } else { /* ((gr_info->block_type != 2)) */ int sfb = gr_info->maxbandl; int is_p,idx = bi->longIdx[sfb]; /* hmm ... maybe the maxbandl stuff for i-stereo is buggy? */ if(sfb <= 21) { for ( ; sfb<21; sfb++) { int sb = bi->longDiff[sfb]; is_p = scalefac[sfb]; /* scale: 0-15 */ if(is_p != 7) { real t1,t2; t1 = tab1[is_p]; t2 = tab2[is_p]; for ( ; sb > 0; sb--,idx++) { real v = xr[0][idx]; xr[0][idx] = REAL_MUL(v, t1); xr[1][idx] = REAL_MUL(v, t2); } } else idx += sb; } is_p = scalefac[20]; if(is_p != 7) { /* copy l-band 20 to l-band 21 */ int sb; real t1 = tab1[is_p],t2 = tab2[is_p]; for ( sb = bi->longDiff[21]; sb > 0; sb--,idx++ ) { real v = xr[0][idx]; xr[0][idx] = REAL_MUL(v, t1); xr[1][idx] = REAL_MUL(v, t2); } } } /* end: if(sfb <= 21) */ } /* ... */ } static void III_antialias(real xr[SBLIMIT][SSLIMIT],struct gr_info_s *gr_info) { int sblim; if(gr_info->block_type == 2) { if(!gr_info->mixed_block_flag) return; sblim = 1; } else { sblim = gr_info->maxb-1; } /* 31 alias-reduction operations between each pair of sub-bands */ /* with 8 butterflies between each pair */ { int sb; real *xr1=(real *) xr[1]; for(sb=sblim;sb;sb--,xr1+=10) { int ss; real *cs=aa_cs,*ca=aa_ca; real *xr2 = xr1; for(ss=7;ss>=0;ss--) { /* upper and lower butterfly inputs */ register real bu = *--xr2,bd = *xr1; *xr2 = (bu * (*cs) ) - (bd * (*ca) ); *xr1++ = (bd * (*cs++) ) + (bu * (*ca++) ); } } } } #include "dct64.c" #include "dct36.c" #include "dct12.c" #include "decod386.c" /* * III_hybrid */ static dct36_func_t dct36_func; static void III_hybrid(real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT], int ch,struct gr_info_s *gr_info) { real *tspnt = (real *) tsOut; static real block[2][2][SBLIMIT*SSLIMIT] = { { { 0, } } }; static int blc[2]={0,0}; real *rawout1,*rawout2; int bt; int sb = 0; { int b = blc[ch]; rawout1=block[b][ch]; b=-b+1; rawout2=block[b][ch]; blc[ch] = b; } if(gr_info->mixed_block_flag) { sb = 2; (*dct36_func)(fsIn[0],rawout1,rawout2,win[0],tspnt); (*dct36_func)(fsIn[1],rawout1+18,rawout2+18,win1[0],tspnt+1); rawout1 += 36; rawout2 += 36; tspnt += 2; } bt = gr_info->block_type; if(bt == 2) { for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) { dct12(fsIn[sb],rawout1,rawout2,win[2],tspnt); dct12(fsIn[sb+1],rawout1+18,rawout2+18,win1[2],tspnt+1); } } else { for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) { (*dct36_func)(fsIn[sb],rawout1,rawout2,win[bt],tspnt); (*dct36_func)(fsIn[sb+1],rawout1+18,rawout2+18,win1[bt],tspnt+1); } } for(;sb<SBLIMIT;sb++,tspnt++) { int i; for(i=0;i<SSLIMIT;i++) { tspnt[i*SBLIMIT] = *rawout1++; *rawout2++ = 0.0; } } } /* * main layer3 handler */ /* int do_layer3(struct frame *fr,int outmode,struct audio_info_struct *ai) */ static int do_layer3(struct frame *fr,int single){ int gr, ch, ss,clip=0; int scalefacs[2][39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */ struct III_sideinfo sideinfo; int stereo = fr->stereo; int ms_stereo,i_stereo; int sfreq = fr->sampling_frequency; int stereo1,granules; // if (fr->error_protection) getbits(16); /* skip crc */ if(stereo == 1) { /* stream is mono */ stereo1 = 1; single = 0; } else if(single >= 0) /* stream is stereo, but force to mono */ stereo1 = 1; else stereo1 = 2; if(fr->mode == MPG_MD_JOINT_STEREO) { ms_stereo = (fr->mode_ext & 0x2)>>1; i_stereo = fr->mode_ext & 0x1; } else ms_stereo = i_stereo = 0; if(!III_get_side_info(&sideinfo,stereo,ms_stereo,sfreq,single,fr->lsf)) return -1; set_pointer(sideinfo.main_data_begin); granules = (fr->lsf) ? 1 : 2; for (gr=0;gr<granules;gr++){ static real hybridIn[2][SBLIMIT][SSLIMIT]; static real hybridOut[2][SSLIMIT][SBLIMIT]; { struct gr_info_s *gr_info = &(sideinfo.ch[0].gr[gr]); long part2bits; if(fr->lsf) part2bits = III_get_scale_factors_2(scalefacs[0],gr_info,0); else part2bits = III_get_scale_factors_1(scalefacs[0],gr_info); if(III_dequantize_sample(hybridIn[0], scalefacs[0],gr_info,sfreq,part2bits)) return clip; } if(stereo == 2) { struct gr_info_s *gr_info = &(sideinfo.ch[1].gr[gr]); long part2bits; if(fr->lsf) part2bits = III_get_scale_factors_2(scalefacs[1],gr_info,i_stereo); else part2bits = III_get_scale_factors_1(scalefacs[1],gr_info); if(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_info,sfreq,part2bits)) return clip; if(ms_stereo) { int i; int maxb = sideinfo.ch[0].gr[gr].maxb; if(sideinfo.ch[1].gr[gr].maxb > maxb) maxb = sideinfo.ch[1].gr[gr].maxb; for(i=0;i<SSLIMIT*maxb;i++) { real tmp0 = ((real *)hybridIn[0])[i]; real tmp1 = ((real *)hybridIn[1])[i]; ((real *)hybridIn[0])[i] = tmp0 + tmp1; ((real *)hybridIn[1])[i] = tmp0 - tmp1; } } if(i_stereo) III_i_stereo(hybridIn,scalefacs[1],gr_info,sfreq,ms_stereo,fr->lsf); if(ms_stereo || i_stereo || (single == 3) ) { if(gr_info->maxb > sideinfo.ch[0].gr[gr].maxb) sideinfo.ch[0].gr[gr].maxb = gr_info->maxb; else gr_info->maxb = sideinfo.ch[0].gr[gr].maxb; } switch(single) { case 3: { register int i; register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1]; for(i=0;i<SSLIMIT*gr_info->maxb;i++,in0++) *in0 = (*in0 + *in1++); /* *0.5 done by pow-scale */ break; } case 1: { register int i; register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1]; for(i=0;i<SSLIMIT*gr_info->maxb;i++) *in0++ = *in1++; break; } } } // if(stereo == 2) for(ch=0;ch<stereo1;ch++) { struct gr_info_s *gr_info = &(sideinfo.ch[ch].gr[gr]); III_antialias(hybridIn[ch],gr_info); III_hybrid(hybridIn[ch], hybridOut[ch], ch,gr_info); } for(ss=0;ss<SSLIMIT;ss++) { if(single >= 0) { clip += (fr->synth_mono)(hybridOut[0][ss],pcm_sample,&pcm_point); } else { int p1 = pcm_point; clip += (fr->synth)(hybridOut[0][ss],0,pcm_sample,&p1); clip += (fr->synth)(hybridOut[1][ss],1,pcm_sample,&pcm_point); } } } return clip; }