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Diffstat (limited to 'lib/liblame/mpglib/layer2.c')
-rw-r--r--lib/liblame/mpglib/layer2.c315
1 files changed, 0 insertions, 315 deletions
diff --git a/lib/liblame/mpglib/layer2.c b/lib/liblame/mpglib/layer2.c
deleted file mode 100644
index 28ba309751..0000000000
--- a/lib/liblame/mpglib/layer2.c
+++ /dev/null
@@ -1,315 +0,0 @@
-/*
- * layer2.c: Mpeg Layer-2 audio decoder
- *
- * Copyright (C) 1999-2010 The L.A.M.E. project
- *
- * Initially written by Michael Hipp, see also AUTHORS and README.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library 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.
- */
-/* $Id: layer2.c,v 1.23.2.2 2010/03/22 14:17:14 robert Exp $ */
-
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#include "common.h"
-#include "layer2.h"
-#include "l2tables.h"
-#include "decode_i386.h"
-
-#ifdef WITH_DMALLOC
-#include <dmalloc.h>
-#endif
-
-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 */
-
-void
-init_layer2(void)
-{
- 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
- };
- static 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;
- real *table;
- static const 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++ = (real) (m * pow(2.0, (double) j / 3.0));
- *table++ = 0.0;
- }
-}
-
-
-static void
-II_step_one(PMPSTR mp, 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_table2 const *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(mp, step = alloc1->bits);
- *bita++ = (char) getbits(mp, step);
- }
- for (i = sblimit - jsbound; i; i--, alloc1 += (1 << step)) {
- bita[0] = (char) getbits(mp, 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(mp, 2);
- }
- else { /* mono */
-
- for (i = sblimit; i; i--, alloc1 += (1 << step))
- *bita++ = (char) getbits(mp, step = alloc1->bits);
- bita = bit_alloc;
- scfsi = scfsi_buf;
- for (i = sblimit; i; i--)
- if (*bita++)
- *scfsi++ = (char) getbits_fast(mp, 2);
- }
-
- bita = bit_alloc;
- scfsi = scfsi_buf;
- for (i = sblimit2; i; i--)
- if (*bita++)
- switch (*scfsi++) {
- case 0:
- *scale++ = getbits_fast(mp, 6);
- *scale++ = getbits_fast(mp, 6);
- *scale++ = getbits_fast(mp, 6);
- break;
- case 1:
- *scale++ = sc = getbits_fast(mp, 6);
- *scale++ = sc;
- *scale++ = getbits_fast(mp, 6);
- break;
- case 2:
- *scale++ = sc = getbits_fast(mp, 6);
- *scale++ = sc;
- *scale++ = sc;
- break;
- default: /* case 3 */
- *scale++ = getbits_fast(mp, 6);
- *scale++ = sc = getbits_fast(mp, 6);
- *scale++ = sc;
- break;
- }
-
-}
-
-static void
-II_step_two(PMPSTR mp, 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_table2 const *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++) {
- ba = *bita++;
- if (ba) {
- k = (alloc2 = alloc1 + ba)->bits;
- if ((d1 = alloc2->d) < 0) {
- real cm = muls[k][scale[x1]];
- fraction[j][0][i] = ((real) ((int) getbits(mp, k) + d1)) * cm;
- fraction[j][1][i] = ((real) ((int) getbits(mp, k) + d1)) * cm;
- fraction[j][2][i] = ((real) ((int) getbits(mp, 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(mp, 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 */
- ba = *bita++;
- if (ba) {
- 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(mp, k) + d1)) * cm;
- fraction[1][1][i] = (fraction[0][1][i] = (real) ((int) getbits(mp, k) + d1)) * cm;
- fraction[1][2][i] = (fraction[0][2][i] = (real) ((int) getbits(mp, 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(mp, 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 !!
-*/
- }
-
-/* 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] = 0.0;
-
-}
-
-static void
-II_select_table(struct frame *fr)
-{
- /* *INDENT-OFF* */
- static 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 } } };
- /* *INDENT-ON* */
-
- int table, sblim;
- static const struct al_table2 *tables[5] = { alloc_0, alloc_1, alloc_2, alloc_3, alloc_4 };
- static const 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 = (struct al_table2 const *) tables[table];
- fr->II_sblimit = sblim;
-}
-
-
-int
-do_layer2(PMPSTR mp, unsigned char *pcm_sample, int *pcm_point)
-/*int do_layer2(struct frame *fr,int outmode,struct audio_info_struct *ai) */
-{
- int clip = 0;
- int i, j;
- real fraction[2][4][SBLIMIT]; /* pick_table clears unused subbands */
- unsigned int bit_alloc[64];
- int scale[192];
- struct frame *fr = &(mp->fr);
- int stereo = fr->stereo;
- 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 (stereo == 1 || single == 3)
- single = 0;
-
- II_step_one(mp, bit_alloc, scale, fr);
-
- for (i = 0; i < SCALE_BLOCK; i++) {
- II_step_two(mp, bit_alloc, fraction, scale, fr, i >> 2);
- for (j = 0; j < 3; j++) {
- if (single >= 0) {
- clip += synth_1to1_mono(mp, fraction[single][j], pcm_sample, pcm_point);
- }
- else {
- int p1 = *pcm_point;
- clip += synth_1to1(mp, fraction[0][j], 0, pcm_sample, &p1);
- clip += synth_1to1(mp, fraction[1][j], 1, pcm_sample, pcm_point);
- }
- }
- }
-
- return clip;
-}
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