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-rw-r--r--src/libmpg123/layer2.c304
1 files changed, 0 insertions, 304 deletions
diff --git a/src/libmpg123/layer2.c b/src/libmpg123/layer2.c
deleted file mode 100644
index b5a3c27b6..000000000
--- a/src/libmpg123/layer2.c
+++ /dev/null
@@ -1,304 +0,0 @@
-/*
- * Mpeg Layer-2 audio decoder
- * --------------------------
- * copyright (c) 1995 by Michael Hipp, All rights reserved. See also 'README'
- *
- */
-
-#include "mpg123.h"
-#include "l2tables.h"
-
-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 */
-
-real muls[27][64]; /* also used by layer 1 */
-
-void init_layer2(void)
-{
- static 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 };
- static 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;
- real *table;
- static int tablen[3] = { 3 , 5 , 9 };
- static int *itable,*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];
- }
- }
-
- for(k=0;k<27;k++)
- {
- double m=mulmul[k];
- table = muls[k];
- for(j=3,i=0;i<63;i++,j--)
- *table++ = m * pow(2.0,(double) j / 3.0);
- *table++ = 0.0;
- }
-}
-
-
-void II_step_one(unsigned int *bit_alloc,int *scale,struct frame *fr)
-{
- int stereo = fr->stereo-1;
- int sblimit = fr->II_sblimit;
- int jsbound = fr->jsbound;
- int sblimit2 = fr->II_sblimit<<stereo;
- struct al_table *alloc1 = fr->alloc;
- int i;
- static 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))
- {
- *bita++ = (char) getbits(step=alloc1->bits);
- *bita++ = (char) getbits(step);
- }
- for (i=sblimit-jsbound;i;i--,alloc1+=(1<<step))
- {
- bita[0] = (char) getbits(step=alloc1->bits);
- bita[1] = bita[0];
- bita+=2;
- }
- bita = bit_alloc;
- scfsi=scfsi_buf;
- for (i=sblimit2;i;i--)
- if (*bita++)
- *scfsi++ = (char) getbits_fast(2);
- }
- else /* mono */
- {
- for (i=sblimit;i;i--,alloc1+=(1<<step))
- *bita++ = (char) getbits(step=alloc1->bits);
- bita = bit_alloc;
- scfsi=scfsi_buf;
- for (i=sblimit;i;i--)
- if (*bita++)
- *scfsi++ = (char) getbits_fast(2);
- }
-
- bita = bit_alloc;
- scfsi=scfsi_buf;
- for (i=sblimit2;i;i--)
- if (*bita++)
- switch (*scfsi++)
- {
- case 0:
- *scale++ = getbits_fast(6);
- *scale++ = getbits_fast(6);
- *scale++ = getbits_fast(6);
- break;
- case 1 :
- *scale++ = sc = getbits_fast(6);
- *scale++ = sc;
- *scale++ = getbits_fast(6);
- break;
- case 2:
- *scale++ = sc = getbits_fast(6);
- *scale++ = sc;
- *scale++ = sc;
- break;
- default: /* case 3 */
- *scale++ = getbits_fast(6);
- *scale++ = sc = getbits_fast(6);
- *scale++ = sc;
- break;
- }
-
-}
-
-void II_step_two(unsigned int *bit_alloc,real fraction[2][4][SBLIMIT],int *scale,struct frame *fr,int x1)
-{
- int i,j,k,ba;
- int stereo = fr->stereo;
- int sblimit = fr->II_sblimit;
- int jsbound = fr->jsbound;
- 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=muls[k][scale[x1]];
- fraction[j][0][i] = ((real) ((int)getbits(k) + d1)) * cm;
- fraction[j][1][i] = ((real) ((int)getbits(k) + d1)) * cm;
- fraction[j][2][i] = ((real) ((int)getbits(k) + d1)) * cm;
- }
- else
- {
- static 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(k);
- tab = (unsigned int *) (table[d1] + idx + idx + idx);
- fraction[j][0][i] = muls[*tab++][m];
- fraction[j][1][i] = muls[*tab++][m];
- fraction[j][2][i] = muls[*tab][m];
- }
- scale+=3;
- }
- else
- fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = 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=muls[k][scale[x1+3]];
- fraction[1][0][i] = (fraction[0][0][i] = (real) ((int)getbits(k) + d1) ) * cm;
- fraction[1][1][i] = (fraction[0][1][i] = (real) ((int)getbits(k) + d1) ) * cm;
- fraction[1][2][i] = (fraction[0][2][i] = (real) ((int)getbits(k) + d1) ) * cm;
- cm=muls[k][scale[x1]];
- fraction[0][0][i] *= cm; fraction[0][1][i] *= cm; fraction[0][2][i] *= cm;
- }
- else
- {
- static 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(k);
- tab = (unsigned int *) (table[d1] + idx + idx + idx);
- fraction[0][0][i] = muls[*tab][m1]; fraction[1][0][i] = muls[*tab++][m2];
- fraction[0][1][i] = muls[*tab][m1]; fraction[1][1][i] = muls[*tab++][m2];
- fraction[0][2][i] = muls[*tab][m1]; fraction[1][2][i] = 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] = 0.0;
- }
-/*
- 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 !!
-*/
- }
-
- for(i=sblimit;i<SBLIMIT;i++)
- for (j=0;j<stereo;j++)
- fraction[j][0][i] = fraction[j][1][i] = fraction[j][2][i] = 0.0;
-
-}
-
-static void II_select_table(struct frame *fr)
-{
- static 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;
- static struct al_table *tables[5] =
- { alloc_0, alloc_1, alloc_2, alloc_3 , alloc_4 };
- static int sblims[5] = { 27 , 30 , 8, 12 , 30 };
-
- if(fr->lsf)
- 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;
-}
-
-void do_layer2(mpgaudio_t *mp)
-{
- int clip=0;
- int i,j;
- struct frame *fr = &mp->fr;
- int stereo = fr->stereo;
- static real fraction[2][4][SBLIMIT]; /* pick_table clears unused subbands */
- unsigned int bit_alloc[64];
- int scale[192];
- int single = fr->single;
- int num_bytes;
-
- II_select_table(fr);
- fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
- (fr->mode_ext<<2)+4 : fr->II_sblimit;
-
- if(stereo == 1 || single == 3)
- single = 0;
-
- II_step_one(bit_alloc, scale, fr);
-
- num_bytes=0;
- 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 >= 0) {
- clip += synth_1to1_mono(mp, fraction[0][j],mp->osspace,&num_bytes);
- }
- else {
- int p1 = num_bytes;
- clip += synth_1to1(mp, fraction[0][j],0,mp->osspace,&p1);
- clip += synth_1to1(mp, fraction[1][j],1,mp->osspace,&num_bytes);
- }
- }
- }
-
- if ((!mp->is_output_initialized) || (mp->sample_rate_device != fr->sample_rate)) {
-
- if (mp->is_output_initialized)
- mp->ao_output->close(mp->ao_output);
-
- mp->ao_output->open (mp->ao_output, 16, fr->sample_rate,
- stereo-1 ? AO_CAP_MODE_STEREO: AO_CAP_MODE_MONO);
- mp->is_output_initialized = 1;
- mp->sample_rate_device = fr->sample_rate;
- }
-
- mp->ao_output->write (mp->ao_output, (int16_t*)mp->osspace, num_bytes/(stereo-1 ? 4:2),
- mp->pts);
- mp->pts = 0;
-
-}
-
-
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