| /* |
| * Mpeg Layer-3 audio decoder |
| * -------------------------- |
| * copyright (c) 1995,1996,1997 by Michael Hipp. |
| * All rights reserved. See also 'README' |
| * This file has been copied from mpglib. |
| * |
| * This library 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. |
| * |
| * This library 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 this library; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <stdlib.h> |
| #include "mpg123.h" |
| #include "mpglib.h" |
| #include "huffman.h" |
| |
| extern struct mpstr *gmp; |
| |
| #define MPEG1 |
| |
| |
| 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]; |
| static real COS9[9]; |
| static real COS6_1,COS6_2; |
| static real tfcos36[9]; |
| static real tfcos12[3]; |
| |
| struct bandInfoStruct { |
| short longIdx[23]; |
| short longDiff[22]; |
| short shortIdx[14]; |
| short shortDiff[13]; |
| }; |
| |
| int longLimit[9][23]; |
| int shortLimit[9][14]; |
| |
| 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 } } , |
| |
| { {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,330,394,464,540,576}, |
| {6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,52,64,70,76,36 } , |
| {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 |
| */ |
| void init_layer3(int down_sample_sblimit) |
| { |
| int i,j,k,l; |
| |
| for(i=-256;i<118+4;i++) |
| 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); |
| |
| 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; |
| short *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 |
| */ |
| #ifdef MPEG1 |
| static int III_get_side_info_1(struct III_sideinfo *si,int stereo, |
| int ms_stereo,long sfreq,int single) |
| { |
| int ch, gr; |
| int powdiff = (single == 3) ? 4 : 0; |
| |
| si->main_data_begin = getbits(9); |
| if (stereo == 1) |
| si->private_bits = getbits_fast(5); |
| else |
| si->private_bits = getbits_fast(3); |
| |
| 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<2; 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_fast(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_fast(4); |
| /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */ |
| if(get1bit()) |
| { |
| int i; |
| 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. */ |
| gr_info->region1start = 36>>1; |
| gr_info->region2start = 576>>1; |
| } |
| else |
| { |
| int i,r0c,r1c; |
| 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 ; |
| gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1; |
| gr_info->block_type = 0; |
| gr_info->mixed_block_flag = 0; |
| } |
| gr_info->preflag = get1bit(); |
| gr_info->scalefac_scale = get1bit(); |
| gr_info->count1table_select = get1bit(); |
| } |
| } |
| return !0; |
| } |
| #endif |
| |
| /* |
| * Side Info for MPEG 2.0 / LSF |
| */ |
| static int III_get_side_info_2(struct III_sideinfo *si,int stereo, |
| int ms_stereo,long sfreq,int single) |
| { |
| int ch; |
| int powdiff = (single == 3) ? 4 : 0; |
| |
| si->main_data_begin = getbits(8); |
| if (stereo == 1) |
| si->private_bits = get1bit(); |
| else |
| si->private_bits = getbits_fast(2); |
| |
| for (ch=0; ch<stereo; ch++) |
| { |
| register struct gr_info_s *gr_info = &(si->ch[ch].gr[0]); |
| |
| gr_info->part2_3_length = getbits(12); |
| gr_info->big_values = getbits_fast(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(9); |
| /* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */ |
| if(get1bit()) |
| { |
| int i; |
| 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. */ |
| /* check this again! */ |
| if(gr_info->block_type == 2) |
| gr_info->region1start = 36>>1; |
| else if(sfreq == 8) |
| /* check this for 2.5 and sfreq=8 */ |
| gr_info->region1start = 108>>1; |
| else |
| gr_info->region1start = 54>>1; |
| gr_info->region2start = 576>>1; |
| } |
| else |
| { |
| int i,r0c,r1c; |
| 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 ; |
| gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1; |
| gr_info->block_type = 0; |
| gr_info->mixed_block_flag = 0; |
| } |
| gr_info->scalefac_scale = get1bit(); |
| gr_info->count1table_select = get1bit(); |
| } |
| return !0; |
| } |
| |
| /* |
| * read scalefactors |
| */ |
| #ifdef MPEG1 |
| 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; |
| } |
| #endif |
| |
| |
| 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}; |
| |
| /* |
| * don't forget to apply the same changes to III_dequantize_sample_ms() !!! |
| */ |
| 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 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] = 0; 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=0,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; |
| while((y=*val++)<0) { |
| if (get1bit()) |
| val -= y; |
| part2remain--; |
| } |
| x = y >> 4; |
| y &= 0xf; |
| } |
| if(x == 15) { |
| max[lwin] = cb; |
| part2remain -= h->linbits+1; |
| x += getbits(h->linbits); |
| if(get1bit()) |
| *xrpnt = -ispow[x] * v; |
| else |
| *xrpnt = ispow[x] * v; |
| } |
| else if(x) { |
| max[lwin] = cb; |
| if(get1bit()) |
| *xrpnt = -ispow[x] * v; |
| else |
| *xrpnt = ispow[x] * v; |
| part2remain--; |
| } |
| else |
| *xrpnt = 0.0; |
| xrpnt += step; |
| if(y == 15) { |
| max[lwin] = cb; |
| part2remain -= h->linbits+1; |
| y += getbits(h->linbits); |
| if(get1bit()) |
| *xrpnt = -ispow[y] * v; |
| else |
| *xrpnt = ispow[y] * v; |
| } |
| else if(y) { |
| max[lwin] = cb; |
| if(get1bit()) |
| *xrpnt = -ispow[y] * v; |
| else |
| *xrpnt = ispow[y] * v; |
| part2remain--; |
| } |
| else |
| *xrpnt = 0.0; |
| xrpnt += step; |
| } |
| } |
| for(;l3 && (part2remain > 0);l3--) { |
| struct newhuff *h = htc+gr_info->count1table_select; |
| register short *val = h->table,a; |
| |
| while((a=*val++)<0) { |
| part2remain--; |
| if(part2remain < 0) { |
| part2remain++; |
| a = 0; |
| break; |
| } |
| if (get1bit()) |
| val -= a; |
| } |
| |
| 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; |
| part2remain--; |
| if(part2remain < 0) { |
| part2remain++; |
| break; |
| } |
| if(get1bit()) |
| *xrpnt = -v; |
| else |
| *xrpnt = v; |
| } |
| else |
| *xrpnt = 0.0; |
| xrpnt += step; |
| } |
| } |
| |
| while( m < me ) { |
| if(!mc) { |
| mc = *m++; |
| xrpnt = ((real *) xr) + *m++; |
| if( (*m++) == 3) |
| step = 1; |
| else |
| step = 3; |
| m++; /* cb */ |
| } |
| mc--; |
| *xrpnt = 0.0; |
| xrpnt += step; |
| *xrpnt = 0.0; |
| xrpnt += step; |
| /* we could add a little opt. here: |
| * if we finished a band for window 3 or a long band |
| * further bands could copied in a simple loop without a |
| * special 'map' decoding |
| */ |
| } |
| |
| 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; |
| register int *m = map[sfreq][2]; |
| register real v = 0.0; |
| register int mc = 0; |
| #if 0 |
| me = mapend[sfreq][2]; |
| #endif |
| |
| /* |
| * 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++; |
| v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; |
| cb = *m++; |
| } |
| { |
| register short *val = h->table; |
| while((y=*val++)<0) { |
| if (get1bit()) |
| val -= y; |
| part2remain--; |
| } |
| x = y >> 4; |
| y &= 0xf; |
| } |
| if (x == 15) { |
| max = cb; |
| part2remain -= h->linbits+1; |
| x += getbits(h->linbits); |
| if(get1bit()) |
| *xrpnt++ = -ispow[x] * v; |
| else |
| *xrpnt++ = ispow[x] * v; |
| } |
| else if(x) { |
| max = cb; |
| if(get1bit()) |
| *xrpnt++ = -ispow[x] * v; |
| else |
| *xrpnt++ = ispow[x] * v; |
| part2remain--; |
| } |
| else |
| *xrpnt++ = 0.0; |
| |
| if (y == 15) { |
| max = cb; |
| part2remain -= h->linbits+1; |
| y += getbits(h->linbits); |
| if(get1bit()) |
| *xrpnt++ = -ispow[y] * v; |
| else |
| *xrpnt++ = ispow[y] * v; |
| } |
| else if(y) { |
| max = cb; |
| if(get1bit()) |
| *xrpnt++ = -ispow[y] * v; |
| else |
| *xrpnt++ = ispow[y] * v; |
| part2remain--; |
| } |
| else |
| *xrpnt++ = 0.0; |
| } |
| } |
| |
| /* |
| * short (count1table) values |
| */ |
| for(;l3 && (part2remain > 0);l3--) { |
| struct newhuff *h = htc+gr_info->count1table_select; |
| register short *val = h->table,a; |
| |
| while((a=*val++)<0) { |
| part2remain--; |
| if(part2remain < 0) { |
| part2remain++; |
| a = 0; |
| break; |
| } |
| if (get1bit()) |
| val -= a; |
| } |
| |
| for(i=0;i<4;i++) { |
| if(!(i & 1)) { |
| if(!mc) { |
| mc = *m++; |
| cb = *m++; |
| v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; |
| } |
| mc--; |
| } |
| if ( (a & (0x8>>i)) ) { |
| max = cb; |
| part2remain--; |
| if(part2remain < 0) { |
| part2remain++; |
| break; |
| } |
| if(get1bit()) |
| *xrpnt++ = -v; |
| else |
| *xrpnt++ = v; |
| } |
| else |
| *xrpnt++ = 0.0; |
| } |
| } |
| |
| /* |
| * zero part |
| */ |
| for(i=(&xr[SBLIMIT][0]-xrpnt)>>1;i;i--) { |
| *xrpnt++ = 0.0; |
| *xrpnt++ = 0.0; |
| } |
| |
| gr_info->maxbandl = max+1; |
| gr_info->maxb = longLimit[sfreq][gr_info->maxbandl]; |
| } |
| |
| 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; |
| } |
| |
| #if 0 |
| static int III_dequantize_sample_ms(real xr[2][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[1]; |
| real *xr0pnt = (real *) xr[0]; |
| int l[3],l3; |
| int part2remain = gr_info->part2_3_length - part2bits; |
| int *me; |
| |
| { |
| 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 gain |
| */ |
| if(bv <= region1) { |
| l[0] = bv; l[1] = 0; 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) { |
| int i,max[4]; |
| int step=0,lwin=0,cb=0; |
| register real v = 0.0; |
| register int *m,mc = 0; |
| |
| 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]; |
| } |
| |
| for(i=0;i<2;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++; |
| xrpnt = ((real *) xr[1]) + *m; |
| xr0pnt = ((real *) xr[0]) + *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; |
| while((y=*val++)<0) { |
| if (get1bit()) |
| val -= y; |
| part2remain--; |
| } |
| x = y >> 4; |
| y &= 0xf; |
| } |
| if(x == 15) { |
| max[lwin] = cb; |
| part2remain -= h->linbits+1; |
| x += getbits(h->linbits); |
| if(get1bit()) { |
| real a = ispow[x] * v; |
| *xrpnt = *xr0pnt + a; |
| *xr0pnt -= a; |
| } |
| else { |
| real a = ispow[x] * v; |
| *xrpnt = *xr0pnt - a; |
| *xr0pnt += a; |
| } |
| } |
| else if(x) { |
| max[lwin] = cb; |
| if(get1bit()) { |
| real a = ispow[x] * v; |
| *xrpnt = *xr0pnt + a; |
| *xr0pnt -= a; |
| } |
| else { |
| real a = ispow[x] * v; |
| *xrpnt = *xr0pnt - a; |
| *xr0pnt += a; |
| } |
| part2remain--; |
| } |
| else |
| *xrpnt = *xr0pnt; |
| xrpnt += step; |
| xr0pnt += step; |
| |
| if(y == 15) { |
| max[lwin] = cb; |
| part2remain -= h->linbits+1; |
| y += getbits(h->linbits); |
| if(get1bit()) { |
| real a = ispow[y] * v; |
| *xrpnt = *xr0pnt + a; |
| *xr0pnt -= a; |
| } |
| else { |
| real a = ispow[y] * v; |
| *xrpnt = *xr0pnt - a; |
| *xr0pnt += a; |
| } |
| } |
| else if(y) { |
| max[lwin] = cb; |
| if(get1bit()) { |
| real a = ispow[y] * v; |
| *xrpnt = *xr0pnt + a; |
| *xr0pnt -= a; |
| } |
| else { |
| real a = ispow[y] * v; |
| *xrpnt = *xr0pnt - a; |
| *xr0pnt += a; |
| } |
| part2remain--; |
| } |
| else |
| *xrpnt = *xr0pnt; |
| xrpnt += step; |
| xr0pnt += step; |
| } |
| } |
| |
| for(;l3 && (part2remain > 0);l3--) { |
| struct newhuff *h = htc+gr_info->count1table_select; |
| register short *val = h->table,a; |
| |
| while((a=*val++)<0) { |
| part2remain--; |
| if(part2remain < 0) { |
| part2remain++; |
| a = 0; |
| break; |
| } |
| if (get1bit()) |
| val -= a; |
| } |
| |
| for(i=0;i<4;i++) { |
| if(!(i & 1)) { |
| if(!mc) { |
| mc = *m++; |
| xrpnt = ((real *) xr[1]) + *m; |
| xr0pnt = ((real *) xr[0]) + *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; |
| part2remain--; |
| if(part2remain < 0) { |
| part2remain++; |
| break; |
| } |
| if(get1bit()) { |
| *xrpnt = *xr0pnt + v; |
| *xr0pnt -= v; |
| } |
| else { |
| *xrpnt = *xr0pnt - v; |
| *xr0pnt += v; |
| } |
| } |
| else |
| *xrpnt = *xr0pnt; |
| xrpnt += step; |
| xr0pnt += step; |
| } |
| } |
| |
| while( m < me ) { |
| if(!mc) { |
| mc = *m++; |
| xrpnt = ((real *) xr[1]) + *m; |
| xr0pnt = ((real *) xr[0]) + *m++; |
| if(*m++ == 3) |
| step = 1; |
| else |
| step = 3; |
| m++; /* cb */ |
| } |
| mc--; |
| *xrpnt = *xr0pnt; |
| xrpnt += step; |
| xr0pnt += step; |
| *xrpnt = *xr0pnt; |
| xrpnt += step; |
| xr0pnt += step; |
| /* we could add a little opt. here: |
| * if we finished a band for window 3 or a long band |
| * further bands could copied in a simple loop without a |
| * special 'map' decoding |
| */ |
| } |
| |
| 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 { |
| int *pretab = gr_info->preflag ? pretab1 : pretab2; |
| int i,max = -1; |
| int cb = 0; |
| register int mc=0,*m = map[sfreq][2]; |
| register real v = 0.0; |
| #if 0 |
| me = mapend[sfreq][2]; |
| #endif |
| |
| 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++; |
| v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; |
| } |
| { |
| register short *val = h->table; |
| while((y=*val++)<0) { |
| if (get1bit()) |
| val -= y; |
| part2remain--; |
| } |
| x = y >> 4; |
| y &= 0xf; |
| } |
| if (x == 15) { |
| max = cb; |
| part2remain -= h->linbits+1; |
| x += getbits(h->linbits); |
| if(get1bit()) { |
| real a = ispow[x] * v; |
| *xrpnt++ = *xr0pnt + a; |
| *xr0pnt++ -= a; |
| } |
| else { |
| real a = ispow[x] * v; |
| *xrpnt++ = *xr0pnt - a; |
| *xr0pnt++ += a; |
| } |
| } |
| else if(x) { |
| max = cb; |
| if(get1bit()) { |
| real a = ispow[x] * v; |
| *xrpnt++ = *xr0pnt + a; |
| *xr0pnt++ -= a; |
| } |
| else { |
| real a = ispow[x] * v; |
| *xrpnt++ = *xr0pnt - a; |
| *xr0pnt++ += a; |
| } |
| part2remain--; |
| } |
| else |
| *xrpnt++ = *xr0pnt++; |
| |
| if (y == 15) { |
| max = cb; |
| part2remain -= h->linbits+1; |
| y += getbits(h->linbits); |
| if(get1bit()) { |
| real a = ispow[y] * v; |
| *xrpnt++ = *xr0pnt + a; |
| *xr0pnt++ -= a; |
| } |
| else { |
| real a = ispow[y] * v; |
| *xrpnt++ = *xr0pnt - a; |
| *xr0pnt++ += a; |
| } |
| } |
| else if(y) { |
| max = cb; |
| if(get1bit()) { |
| real a = ispow[y] * v; |
| *xrpnt++ = *xr0pnt + a; |
| *xr0pnt++ -= a; |
| } |
| else { |
| real a = ispow[y] * v; |
| *xrpnt++ = *xr0pnt - a; |
| *xr0pnt++ += a; |
| } |
| part2remain--; |
| } |
| else |
| *xrpnt++ = *xr0pnt++; |
| } |
| } |
| |
| for(;l3 && (part2remain > 0);l3--) { |
| struct newhuff *h = htc+gr_info->count1table_select; |
| register short *val = h->table,a; |
| |
| while((a=*val++)<0) { |
| part2remain--; |
| if(part2remain < 0) { |
| part2remain++; |
| a = 0; |
| break; |
| } |
| if (get1bit()) |
| val -= a; |
| } |
| |
| for(i=0;i<4;i++) { |
| if(!(i & 1)) { |
| if(!mc) { |
| mc = *m++; |
| cb = *m++; |
| v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift]; |
| } |
| mc--; |
| } |
| if ( (a & (0x8>>i)) ) { |
| max = cb; |
| part2remain--; |
| if(part2remain <= 0) { |
| part2remain++; |
| break; |
| } |
| if(get1bit()) { |
| *xrpnt++ = *xr0pnt + v; |
| *xr0pnt++ -= v; |
| } |
| else { |
| *xrpnt++ = *xr0pnt - v; |
| *xr0pnt++ += v; |
| } |
| } |
| else |
| *xrpnt++ = *xr0pnt++; |
| } |
| } |
| for(i=(&xr[1][SBLIMIT][0]-xrpnt)>>1;i;i--) { |
| *xrpnt++ = *xr0pnt++; |
| *xrpnt++ = *xr0pnt++; |
| } |
| |
| gr_info->maxbandl = max+1; |
| gr_info->maxb = longLimit[sfreq][gr_info->maxbandl]; |
| } |
| |
| while ( part2remain > 16 ) { |
| getbits(16); /* Dismiss stuffing Bits */ |
| part2remain -= 16; |
| } |
| if(part2remain > 0 ) |
| getbits(part2remain); |
| else if(part2remain < 0) { |
| fprintf(stderr,"mpg123_ms: Can't rewind stream by %d bits!\n",-part2remain); |
| return 1; /* -> error */ |
| } |
| return 0; |
| } |
| #endif |
| |
| /* |
| * 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]; |
| real *tab1,*tab2; |
| |
| 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; |
| } |
| } |
| |
| 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] = v * t1; |
| xr[1][idx] = 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] = v * t1; |
| xr[1][idx] = v * t2; |
| } |
| } |
| } /* end for(lwin; .. ; . ) */ |
| |
| if (do_l) |
| { |
| /* also check l-part, if ALL bands in the three windows are 'empty' |
| * and mode = mixed_mode |
| */ |
| 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] = v * t1; |
| xr[1][idx] = v * t2; |
| } |
| } |
| else |
| idx += sb; |
| } |
| } |
| } |
| else /* ((gr_info->block_type != 2)) */ |
| { |
| int sfb = gr_info->maxbandl; |
| int is_p,idx = bi->longIdx[sfb]; |
| 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] = v * t1; |
| xr[1][idx] = v * t2; |
| } |
| } |
| else |
| idx += sb; |
| } |
| |
| is_p = scalefac[20]; /* copy l-band 20 to l-band 21 */ |
| if(is_p != 7) |
| { |
| 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] = v * t1; |
| xr[1][idx] = v * t2; |
| } |
| } |
| } /* ... */ |
| } |
| |
| 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++) ); |
| } |
| } |
| } |
| } |
| |
| /* |
| DCT insipired by Jeff Tsay's DCT from the maplay package |
| this is an optimized version with manual unroll. |
| |
| References: |
| [1] S. Winograd: "On Computing the Discrete Fourier Transform", |
| Mathematics of Computation, Volume 32, Number 141, January 1978, |
| Pages 175-199 |
| */ |
| |
| static void dct36(real *inbuf,real *o1,real *o2,real *wintab,real *tsbuf) |
| { |
| { |
| register real *in = inbuf; |
| |
| in[17]+=in[16]; in[16]+=in[15]; in[15]+=in[14]; |
| in[14]+=in[13]; in[13]+=in[12]; in[12]+=in[11]; |
| in[11]+=in[10]; in[10]+=in[9]; in[9] +=in[8]; |
| in[8] +=in[7]; in[7] +=in[6]; in[6] +=in[5]; |
| in[5] +=in[4]; in[4] +=in[3]; in[3] +=in[2]; |
| in[2] +=in[1]; in[1] +=in[0]; |
| |
| in[17]+=in[15]; in[15]+=in[13]; in[13]+=in[11]; in[11]+=in[9]; |
| in[9] +=in[7]; in[7] +=in[5]; in[5] +=in[3]; in[3] +=in[1]; |
| |
| |
| { |
| |
| #define MACRO0(v) { \ |
| real tmp; \ |
| out2[9+(v)] = (tmp = sum0 + sum1) * w[27+(v)]; \ |
| out2[8-(v)] = tmp * w[26-(v)]; } \ |
| sum0 -= sum1; \ |
| ts[SBLIMIT*(8-(v))] = out1[8-(v)] + sum0 * w[8-(v)]; \ |
| ts[SBLIMIT*(9+(v))] = out1[9+(v)] + sum0 * w[9+(v)]; |
| #define MACRO1(v) { \ |
| real sum0,sum1; \ |
| sum0 = tmp1a + tmp2a; \ |
| sum1 = (tmp1b + tmp2b) * tfcos36[(v)]; \ |
| MACRO0(v); } |
| #define MACRO2(v) { \ |
| real sum0,sum1; \ |
| sum0 = tmp2a - tmp1a; \ |
| sum1 = (tmp2b - tmp1b) * tfcos36[(v)]; \ |
| MACRO0(v); } |
| |
| register const real *c = COS9; |
| register real *out2 = o2; |
| register real *w = wintab; |
| register real *out1 = o1; |
| register real *ts = tsbuf; |
| |
| real ta33,ta66,tb33,tb66; |
| |
| ta33 = in[2*3+0] * c[3]; |
| ta66 = in[2*6+0] * c[6]; |
| tb33 = in[2*3+1] * c[3]; |
| tb66 = in[2*6+1] * c[6]; |
| |
| { |
| real tmp1a,tmp2a,tmp1b,tmp2b; |
| tmp1a = in[2*1+0] * c[1] + ta33 + in[2*5+0] * c[5] + in[2*7+0] * c[7]; |
| tmp1b = in[2*1+1] * c[1] + tb33 + in[2*5+1] * c[5] + in[2*7+1] * c[7]; |
| tmp2a = in[2*0+0] + in[2*2+0] * c[2] + in[2*4+0] * c[4] + ta66 + in[2*8+0] * c[8]; |
| tmp2b = in[2*0+1] + in[2*2+1] * c[2] + in[2*4+1] * c[4] + tb66 + in[2*8+1] * c[8]; |
| |
| MACRO1(0); |
| MACRO2(8); |
| } |
| |
| { |
| real tmp1a,tmp2a,tmp1b,tmp2b; |
| tmp1a = ( in[2*1+0] - in[2*5+0] - in[2*7+0] ) * c[3]; |
| tmp1b = ( in[2*1+1] - in[2*5+1] - in[2*7+1] ) * c[3]; |
| tmp2a = ( in[2*2+0] - in[2*4+0] - in[2*8+0] ) * c[6] - in[2*6+0] + in[2*0+0]; |
| tmp2b = ( in[2*2+1] - in[2*4+1] - in[2*8+1] ) * c[6] - in[2*6+1] + in[2*0+1]; |
| |
| MACRO1(1); |
| MACRO2(7); |
| } |
| |
| { |
| real tmp1a,tmp2a,tmp1b,tmp2b; |
| tmp1a = in[2*1+0] * c[5] - ta33 - in[2*5+0] * c[7] + in[2*7+0] * c[1]; |
| tmp1b = in[2*1+1] * c[5] - tb33 - in[2*5+1] * c[7] + in[2*7+1] * c[1]; |
| tmp2a = in[2*0+0] - in[2*2+0] * c[8] - in[2*4+0] * c[2] + ta66 + in[2*8+0] * c[4]; |
| tmp2b = in[2*0+1] - in[2*2+1] * c[8] - in[2*4+1] * c[2] + tb66 + in[2*8+1] * c[4]; |
| |
| MACRO1(2); |
| MACRO2(6); |
| } |
| |
| { |
| real tmp1a,tmp2a,tmp1b,tmp2b; |
| tmp1a = in[2*1+0] * c[7] - ta33 + in[2*5+0] * c[1] - in[2*7+0] * c[5]; |
| tmp1b = in[2*1+1] * c[7] - tb33 + in[2*5+1] * c[1] - in[2*7+1] * c[5]; |
| tmp2a = in[2*0+0] - in[2*2+0] * c[4] + in[2*4+0] * c[8] + ta66 - in[2*8+0] * c[2]; |
| tmp2b = in[2*0+1] - in[2*2+1] * c[4] + in[2*4+1] * c[8] + tb66 - in[2*8+1] * c[2]; |
| |
| MACRO1(3); |
| MACRO2(5); |
| } |
| |
| { |
| real sum0,sum1; |
| sum0 = in[2*0+0] - in[2*2+0] + in[2*4+0] - in[2*6+0] + in[2*8+0]; |
| sum1 = (in[2*0+1] - in[2*2+1] + in[2*4+1] - in[2*6+1] + in[2*8+1] ) * tfcos36[4]; |
| MACRO0(4); |
| } |
| } |
| |
| } |
| } |
| |
| /* |
| * new DCT12 |
| */ |
| static void dct12(real *in,real *rawout1,real *rawout2,register real *wi,register real *ts) |
| { |
| #define DCT12_PART1 \ |
| in5 = in[5*3]; \ |
| in5 += (in4 = in[4*3]); \ |
| in4 += (in3 = in[3*3]); \ |
| in3 += (in2 = in[2*3]); \ |
| in2 += (in1 = in[1*3]); \ |
| in1 += (in0 = in[0*3]); \ |
| \ |
| in5 += in3; in3 += in1; \ |
| \ |
| in2 *= COS6_1; \ |
| in3 *= COS6_1; \ |
| |
| #define DCT12_PART2 \ |
| in0 += in4 * COS6_2; \ |
| \ |
| in4 = in0 + in2; \ |
| in0 -= in2; \ |
| \ |
| in1 += in5 * COS6_2; \ |
| \ |
| in5 = (in1 + in3) * tfcos12[0]; \ |
| in1 = (in1 - in3) * tfcos12[2]; \ |
| \ |
| in3 = in4 + in5; \ |
| in4 -= in5; \ |
| \ |
| in2 = in0 + in1; \ |
| in0 -= in1; |
| |
| |
| { |
| real in0,in1,in2,in3,in4,in5; |
| register real *out1 = rawout1; |
| ts[SBLIMIT*0] = out1[0]; ts[SBLIMIT*1] = out1[1]; ts[SBLIMIT*2] = out1[2]; |
| ts[SBLIMIT*3] = out1[3]; ts[SBLIMIT*4] = out1[4]; ts[SBLIMIT*5] = out1[5]; |
| |
| DCT12_PART1 |
| |
| { |
| real tmp0,tmp1 = (in0 - in4); |
| { |
| real tmp2 = (in1 - in5) * tfcos12[1]; |
| tmp0 = tmp1 + tmp2; |
| tmp1 -= tmp2; |
| } |
| ts[(17-1)*SBLIMIT] = out1[17-1] + tmp0 * wi[11-1]; |
| ts[(12+1)*SBLIMIT] = out1[12+1] + tmp0 * wi[6+1]; |
| ts[(6 +1)*SBLIMIT] = out1[6 +1] + tmp1 * wi[1]; |
| ts[(11-1)*SBLIMIT] = out1[11-1] + tmp1 * wi[5-1]; |
| } |
| |
| DCT12_PART2 |
| |
| ts[(17-0)*SBLIMIT] = out1[17-0] + in2 * wi[11-0]; |
| ts[(12+0)*SBLIMIT] = out1[12+0] + in2 * wi[6+0]; |
| ts[(12+2)*SBLIMIT] = out1[12+2] + in3 * wi[6+2]; |
| ts[(17-2)*SBLIMIT] = out1[17-2] + in3 * wi[11-2]; |
| |
| ts[(6+0)*SBLIMIT] = out1[6+0] + in0 * wi[0]; |
| ts[(11-0)*SBLIMIT] = out1[11-0] + in0 * wi[5-0]; |
| ts[(6+2)*SBLIMIT] = out1[6+2] + in4 * wi[2]; |
| ts[(11-2)*SBLIMIT] = out1[11-2] + in4 * wi[5-2]; |
| } |
| |
| in++; |
| |
| { |
| real in0,in1,in2,in3,in4,in5; |
| register real *out2 = rawout2; |
| |
| DCT12_PART1 |
| |
| { |
| real tmp0,tmp1 = (in0 - in4); |
| { |
| real tmp2 = (in1 - in5) * tfcos12[1]; |
| tmp0 = tmp1 + tmp2; |
| tmp1 -= tmp2; |
| } |
| out2[5-1] = tmp0 * wi[11-1]; |
| out2[0+1] = tmp0 * wi[6+1]; |
| ts[(12+1)*SBLIMIT] += tmp1 * wi[1]; |
| ts[(17-1)*SBLIMIT] += tmp1 * wi[5-1]; |
| } |
| |
| DCT12_PART2 |
| |
| out2[5-0] = in2 * wi[11-0]; |
| out2[0+0] = in2 * wi[6+0]; |
| out2[0+2] = in3 * wi[6+2]; |
| out2[5-2] = in3 * wi[11-2]; |
| |
| ts[(12+0)*SBLIMIT] += in0 * wi[0]; |
| ts[(17-0)*SBLIMIT] += in0 * wi[5-0]; |
| ts[(12+2)*SBLIMIT] += in4 * wi[2]; |
| ts[(17-2)*SBLIMIT] += in4 * wi[5-2]; |
| } |
| |
| in++; |
| |
| { |
| real in0,in1,in2,in3,in4,in5; |
| register real *out2 = rawout2; |
| out2[12]=out2[13]=out2[14]=out2[15]=out2[16]=out2[17]=0.0; |
| |
| DCT12_PART1 |
| |
| { |
| real tmp0,tmp1 = (in0 - in4); |
| { |
| real tmp2 = (in1 - in5) * tfcos12[1]; |
| tmp0 = tmp1 + tmp2; |
| tmp1 -= tmp2; |
| } |
| out2[11-1] = tmp0 * wi[11-1]; |
| out2[6 +1] = tmp0 * wi[6+1]; |
| out2[0+1] += tmp1 * wi[1]; |
| out2[5-1] += tmp1 * wi[5-1]; |
| } |
| |
| DCT12_PART2 |
| |
| out2[11-0] = in2 * wi[11-0]; |
| out2[6 +0] = in2 * wi[6+0]; |
| out2[6 +2] = in3 * wi[6+2]; |
| out2[11-2] = in3 * wi[11-2]; |
| |
| out2[0+0] += in0 * wi[0]; |
| out2[5-0] += in0 * wi[5-0]; |
| out2[0+2] += in4 * wi[2]; |
| out2[5-2] += in4 * wi[5-2]; |
| } |
| } |
| |
| /* |
| * III_hybrid |
| */ |
| static void III_hybrid(real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT], |
| int ch,struct gr_info_s *gr_info) |
| { |
| real *tspnt = (real *) tsOut; |
| real (*block)[2][SBLIMIT*SSLIMIT] = gmp->hybrid_block; |
| int *blc = gmp->hybrid_blc; |
| 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(fsIn[0],rawout1,rawout2,win[0],tspnt); |
| dct36(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(fsIn[sb],rawout1,rawout2,win[bt],tspnt); |
| dct36(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,unsigned char *pcm_sample,int *pcm_point) |
| { |
| 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 single = fr->single; |
| int ms_stereo,i_stereo; |
| int sfreq = fr->sampling_frequency; |
| int stereo1,granules; |
| |
| 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; |
| i_stereo = fr->mode_ext & 0x1; |
| } |
| else |
| ms_stereo = i_stereo = 0; |
| |
| if(fr->lsf) { |
| granules = 1; |
| if(!III_get_side_info_2(&sideinfo,stereo,ms_stereo,sfreq,single)) |
| return -1; |
| } |
| else { |
| granules = 2; |
| #ifdef MPEG1 |
| if(!III_get_side_info_1(&sideinfo,stereo,ms_stereo,sfreq,single)) |
| return -1; |
| #else |
| fprintf(stderr,"Not supported\n"); |
| #endif |
| } |
| |
| if(set_pointer(sideinfo.main_data_begin) == MP3_ERR) |
| return -1; |
| |
| for (gr=0;gr<granules;gr++) |
| { |
| real hybridIn[2][SBLIMIT][SSLIMIT]; |
| 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 { |
| #ifdef MPEG1 |
| part2bits = III_get_scale_factors_1(scalefacs[0],gr_info); |
| #else |
| fprintf(stderr,"Not supported\n"); |
| #endif |
| } |
| 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 { |
| #ifdef MPEG1 |
| part2bits = III_get_scale_factors_1(scalefacs[1],gr_info); |
| #else |
| fprintf(stderr,"Not supported\n"); |
| #endif |
| } |
| |
| if(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_info,sfreq,part2bits)) |
| return clip; |
| |
| if(ms_stereo) { |
| int i; |
| for(i=0;i<SBLIMIT*SSLIMIT;i++) { |
| real tmp0,tmp1; |
| tmp0 = ((real *) hybridIn[0])[i]; |
| 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; |
| } |
| } |
| |
| 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 += synth_1to1_mono(hybridOut[0][ss],pcm_sample,pcm_point); |
| } |
| else { |
| int p1 = *pcm_point; |
| clip += synth_1to1(hybridOut[0][ss],0,pcm_sample,&p1); |
| clip += synth_1to1(hybridOut[1][ss],1,pcm_sample,pcm_point); |
| } |
| } |
| } |
| |
| return clip; |
| } |
