| 0,0 → 1,369 |
|---|
| /* |
| layer2.c: the layer 2 decoder, root of mpg123 |
| |
| copyright 1994-2008 by the mpg123 project - free software under the terms of the LGPL 2.1 |
| see COPYING and AUTHORS files in distribution or http://mpg123.org |
| initially written by Michael Hipp |
| |
| mpg123 started as mp2 decoder a long time ago... |
| part of this file is required for layer 1, too. |
| */ |
| |
| |
| #include "mpg123lib_intern.h" |
| #ifndef NO_LAYER2 |
| #include "l2tables.h" |
| #endif |
| #include "getbits.h" |
| |
| #ifndef NO_LAYER12 /* Stuff needed for layer I and II. */ |
| |
| static int grp_3tab[32 * 3] = { 0, }; /* used: 27 */ |
| static int grp_5tab[128 * 3] = { 0, }; /* used: 125 */ |
| static int grp_9tab[1024 * 3] = { 0, }; /* used: 729 */ |
| |
| #if defined(REAL_IS_FIXED) && defined(PRECALC_TABLES) |
| #include "l12_integer_tables.h" |
| #else |
| static const double mulmul[27] = |
| { |
| 0.0 , -2.0/3.0 , 2.0/3.0 , |
| 2.0/7.0 , 2.0/15.0 , 2.0/31.0, 2.0/63.0 , 2.0/127.0 , 2.0/255.0 , |
| 2.0/511.0 , 2.0/1023.0 , 2.0/2047.0 , 2.0/4095.0 , 2.0/8191.0 , |
| 2.0/16383.0 , 2.0/32767.0 , 2.0/65535.0 , |
| -4.0/5.0 , -2.0/5.0 , 2.0/5.0, 4.0/5.0 , |
| -8.0/9.0 , -4.0/9.0 , -2.0/9.0 , 2.0/9.0 , 4.0/9.0 , 8.0/9.0 |
| }; |
| #endif |
| |
| void init_layer12(void) |
| { |
| const int base[3][9] = |
| { |
| { 1 , 0, 2 , } , |
| { 17, 18, 0 , 19, 20 , } , |
| { 21, 1, 22, 23, 0, 24, 25, 2, 26 } |
| }; |
| int i,j,k,l,len; |
| const int tablen[3] = { 3 , 5 , 9 }; |
| int *itable; |
| int *tables[3] = { grp_3tab , grp_5tab , grp_9tab }; |
| |
| for(i=0;i<3;i++) |
| { |
| itable = tables[i]; |
| len = tablen[i]; |
| for(j=0;j<len;j++) |
| for(k=0;k<len;k++) |
| for(l=0;l<len;l++) |
| { |
| *itable++ = base[i][l]; |
| *itable++ = base[i][k]; |
| *itable++ = base[i][j]; |
| } |
| } |
| } |
| |
| void init_layer12_stuff(mpg123_handle *fr, real* (*init_table)(mpg123_handle *fr, real *table, int m)) |
| { |
| int k; |
| real *table; |
| for(k=0;k<27;k++) |
| { |
| table = init_table(fr, fr->muls[k], k); |
| *table++ = 0.0; |
| } |
| } |
| |
| real* init_layer12_table(mpg123_handle *fr, real *table, int m) |
| { |
| #if defined(REAL_IS_FIXED) && defined(PRECALC_TABLES) |
| int i; |
| for(i=0;i<63;i++) |
| *table++ = layer12_table[m][i]; |
| #else |
| int i,j; |
| for(j=3,i=0;i<63;i++,j--) |
| *table++ = DOUBLE_TO_REAL_SCALE_LAYER12(mulmul[m] * pow(2.0,(double) j / 3.0)); |
| #endif |
| |
| return table; |
| } |
| |
| #ifdef OPT_MMXORSSE |
| real* init_layer12_table_mmx(mpg123_handle *fr, real *table, int m) |
| { |
| int i,j; |
| if(!fr->p.down_sample) |
| { |
| for(j=3,i=0;i<63;i++,j--) |
| *table++ = DOUBLE_TO_REAL(16384 * mulmul[m] * pow(2.0,(double) j / 3.0)); |
| } |
| else |
| { |
| for(j=3,i=0;i<63;i++,j--) |
| *table++ = DOUBLE_TO_REAL(mulmul[m] * pow(2.0,(double) j / 3.0)); |
| } |
| return table; |
| } |
| #endif |
| |
| #endif /* NO_LAYER12 */ |
| |
| /* The rest is the actual decoding of layer II data. */ |
| |
| #ifndef NO_LAYER2 |
| |
| void II_step_one(unsigned int *bit_alloc,int *scale,mpg123_handle *fr) |
| { |
| int stereo = fr->stereo-1; |
| int sblimit = fr->II_sblimit; |
| int jsbound = fr->jsbound; |
| int sblimit2 = fr->II_sblimit<<stereo; |
| const struct al_table *alloc1 = fr->alloc; |
| int i; |
| unsigned int scfsi_buf[64]; |
| unsigned int *scfsi,*bita; |
| int sc,step; |
| |
| bita = bit_alloc; |
| if(stereo) |
| { |
| for(i=jsbound;i;i--,alloc1+=(1<<step)) |
| { |
| step=alloc1->bits; |
| *bita++ = (char) getbits(fr, step); |
| *bita++ = (char) getbits(fr, step); |
| } |
| for(i=sblimit-jsbound;i;i--,alloc1+=(1<<step)) |
| { |
| step=alloc1->bits; |
| bita[0] = (char) getbits(fr, step); |
| bita[1] = bita[0]; |
| bita+=2; |
| } |
| bita = bit_alloc; |
| scfsi=scfsi_buf; |
| |
| for(i=sblimit2;i;i--) |
| if(*bita++) *scfsi++ = (char) getbits_fast(fr, 2); |
| } |
| else /* mono */ |
| { |
| for(i=sblimit;i;i--,alloc1+=(1<<step)) |
| { |
| step=alloc1->bits; |
| *bita++ = (char) getbits(fr, step); |
| } |
| bita = bit_alloc; |
| scfsi=scfsi_buf; |
| for(i=sblimit;i;i--) |
| if(*bita++) *scfsi++ = (char) getbits_fast(fr, 2); |
| } |
| |
| bita = bit_alloc; |
| scfsi=scfsi_buf; |
| for(i=sblimit2;i;i--) |
| if(*bita++) |
| switch(*scfsi++) |
| { |
| case 0: |
| *scale++ = getbits_fast(fr, 6); |
| *scale++ = getbits_fast(fr, 6); |
| *scale++ = getbits_fast(fr, 6); |
| break; |
| case 1 : |
| *scale++ = sc = getbits_fast(fr, 6); |
| *scale++ = sc; |
| *scale++ = getbits_fast(fr, 6); |
| break; |
| case 2: |
| *scale++ = sc = getbits_fast(fr, 6); |
| *scale++ = sc; |
| *scale++ = sc; |
| break; |
| default: /* case 3 */ |
| *scale++ = getbits_fast(fr, 6); |
| *scale++ = sc = getbits_fast(fr, 6); |
| *scale++ = sc; |
| break; |
| } |
| } |
| |
| |
| void II_step_two(unsigned int *bit_alloc,real fraction[2][4][SBLIMIT],int *scale,mpg123_handle *fr,int x1) |
| { |
| int i,j,k,ba; |
| int stereo = fr->stereo; |
| int sblimit = fr->II_sblimit; |
| int jsbound = fr->jsbound; |
| const struct al_table *alloc2,*alloc1 = fr->alloc; |
| unsigned int *bita=bit_alloc; |
| int d1,step; |
| |
| for(i=0;i<jsbound;i++,alloc1+=(1<<step)) |
| { |
| step = alloc1->bits; |
| for(j=0;j<stereo;j++) |
| { |
| if( (ba=*bita++) ) |
| { |
| k=(alloc2 = alloc1+ba)->bits; |
| if( (d1=alloc2->d) < 0) |
| { |
| real cm=fr->muls[k][scale[x1]]; |
| fraction[j][0][i] = REAL_MUL_SCALE_LAYER12(DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1), cm); |
| fraction[j][1][i] = REAL_MUL_SCALE_LAYER12(DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1), cm); |
| fraction[j][2][i] = REAL_MUL_SCALE_LAYER12(DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1), cm); |
| } |
| else |
| { |
| const int *table[] = { 0,0,0,grp_3tab,0,grp_5tab,0,0,0,grp_9tab }; |
| unsigned int idx,*tab,m=scale[x1]; |
| idx = (unsigned int) getbits(fr, k); |
| tab = (unsigned int *) (table[d1] + idx + idx + idx); |
| fraction[j][0][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m]); |
| fraction[j][1][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m]); |
| fraction[j][2][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m]); |
| } |
| scale+=3; |
| } |
| else |
| fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = DOUBLE_TO_REAL(0.0); |
| } |
| } |
| |
| for(i=jsbound;i<sblimit;i++,alloc1+=(1<<step)) |
| { |
| step = alloc1->bits; |
| bita++; /* channel 1 and channel 2 bitalloc are the same */ |
| if( (ba=*bita++) ) |
| { |
| k=(alloc2 = alloc1+ba)->bits; |
| if( (d1=alloc2->d) < 0) |
| { |
| real cm; |
| cm=fr->muls[k][scale[x1+3]]; |
| fraction[0][0][i] = DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1); |
| fraction[0][1][i] = DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1); |
| fraction[0][2][i] = DOUBLE_TO_REAL_15((int)getbits(fr, k) + d1); |
| fraction[1][0][i] = REAL_MUL_SCALE_LAYER12(fraction[0][0][i], cm); |
| fraction[1][1][i] = REAL_MUL_SCALE_LAYER12(fraction[0][1][i], cm); |
| fraction[1][2][i] = REAL_MUL_SCALE_LAYER12(fraction[0][2][i], cm); |
| cm=fr->muls[k][scale[x1]]; |
| fraction[0][0][i] = REAL_MUL_SCALE_LAYER12(fraction[0][0][i], cm); |
| fraction[0][1][i] = REAL_MUL_SCALE_LAYER12(fraction[0][1][i], cm); |
| fraction[0][2][i] = REAL_MUL_SCALE_LAYER12(fraction[0][2][i], cm); |
| } |
| else |
| { |
| const int *table[] = { 0,0,0,grp_3tab,0,grp_5tab,0,0,0,grp_9tab }; |
| unsigned int idx,*tab,m1,m2; |
| m1 = scale[x1]; m2 = scale[x1+3]; |
| idx = (unsigned int) getbits(fr, k); |
| tab = (unsigned int *) (table[d1] + idx + idx + idx); |
| fraction[0][0][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m1]); fraction[1][0][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m2]); |
| fraction[0][1][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m1]); fraction[1][1][i] = REAL_SCALE_LAYER12(fr->muls[*tab++][m2]); |
| fraction[0][2][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m1]); fraction[1][2][i] = REAL_SCALE_LAYER12(fr->muls[*tab][m2]); |
| } |
| scale+=6; |
| } |
| else |
| { |
| fraction[0][0][i] = fraction[0][1][i] = fraction[0][2][i] = |
| fraction[1][0][i] = fraction[1][1][i] = fraction[1][2][i] = DOUBLE_TO_REAL(0.0); |
| } |
| /* |
| Historic comment... |
| should we use individual scalefac for channel 2 or |
| is the current way the right one , where we just copy channel 1 to |
| channel 2 ?? |
| The current 'strange' thing is, that we throw away the scalefac |
| values for the second channel ...!! |
| -> changed .. now we use the scalefac values of channel one !! |
| */ |
| } |
| |
| if(sblimit > (fr->down_sample_sblimit) ) |
| sblimit = fr->down_sample_sblimit; |
| |
| for(i=sblimit;i<SBLIMIT;i++) |
| for (j=0;j<stereo;j++) |
| fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = DOUBLE_TO_REAL(0.0); |
| } |
| |
| |
| static void II_select_table(mpg123_handle *fr) |
| { |
| const int translate[3][2][16] = |
| { |
| { |
| { 0,2,2,2,2,2,2,0,0,0,1,1,1,1,1,0 }, |
| { 0,2,2,0,0,0,1,1,1,1,1,1,1,1,1,0 } |
| }, |
| { |
| { 0,2,2,2,2,2,2,0,0,0,0,0,0,0,0,0 }, |
| { 0,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0 } |
| }, |
| { |
| { 0,3,3,3,3,3,3,0,0,0,1,1,1,1,1,0 }, |
| { 0,3,3,0,0,0,1,1,1,1,1,1,1,1,1,0 } |
| } |
| }; |
| |
| int table,sblim; |
| const struct al_table *tables[5] = { alloc_0, alloc_1, alloc_2, alloc_3 , alloc_4 }; |
| const int sblims[5] = { 27 , 30 , 8, 12 , 30 }; |
| |
| if(fr->sampling_frequency >= 3) /* Or equivalent: (fr->lsf == 1) */ |
| table = 4; |
| else |
| table = translate[fr->sampling_frequency][2-fr->stereo][fr->bitrate_index]; |
| |
| sblim = sblims[table]; |
| fr->alloc = tables[table]; |
| fr->II_sblimit = sblim; |
| } |
| |
| |
| int do_layer2(mpg123_handle *fr) |
| { |
| int clip=0; |
| int i,j; |
| int stereo = fr->stereo; |
| ALIGNED(16) real fraction[2][4][SBLIMIT]; /* pick_table clears unused subbands */ |
| unsigned int bit_alloc[64]; |
| int scale[192]; |
| int single = fr->single; |
| |
| II_select_table(fr); |
| fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? (fr->mode_ext<<2)+4 : fr->II_sblimit; |
| |
| if(fr->jsbound > fr->II_sblimit) |
| { |
| // fprintf(stderr, "Truncating stereo boundary to sideband limit.\n"); |
| fr->jsbound=fr->II_sblimit; |
| } |
| |
| /* TODO: What happens with mono mixing, actually? */ |
| if(stereo == 1 || single == SINGLE_MIX) /* also, mix not really handled */ |
| single = SINGLE_LEFT; |
| |
| II_step_one(bit_alloc, scale, fr); |
| |
| for(i=0;i<SCALE_BLOCK;i++) |
| { |
| II_step_two(bit_alloc,fraction,scale,fr,i>>2); |
| for(j=0;j<3;j++) |
| { |
| if(single != SINGLE_STEREO) |
| clip += (fr->synth_mono)(fraction[single][j], fr); |
| else |
| clip += (fr->synth_stereo)(fraction[0][j], fraction[1][j], fr); |
| } |
| } |
| |
| return clip; |
| } |
| |
| #endif /* NO_LAYER2 */ |