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layer3.c
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/*
* layer3.c: Mpeg Layer-3 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: layer3.c,v 1.63.2.1 2012/02/11 11:03:20 robert Exp $ */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include "common.h"
#include "huffman.h"
#include "lame.h"
#include "machine.h"
#include "encoder.h"
#include "lame-analysis.h"
#include "decode_i386.h"
#include "layer3.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
static int gd_are_hip_tables_layer3_initialized = 0;
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];
};
static int longLimit[9][23];
static int shortLimit[9][14];
/* *INDENT-OFF* */
static const 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 } } ,
/* docs: 332. mpg123: 330 */
{ {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} } ,
};
/* *INDENT-ON* */
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];
static unsigned int
get1bit(PMPSTR mp)
{
unsigned char rval;
rval = *mp->wordpointer << mp->bitindex;
mp->bitindex++;
mp->wordpointer += (mp->bitindex >> 3);
mp->bitindex &= 7;
return rval >> 7;
}
/*
* init tables for layer-3
*/
void
hip_init_tables_layer3(void)
{
int i, j, k;
if (gd_are_hip_tables_layer3_initialized) {
return;
}
gd_are_hip_tables_layer3_initialized = 1;
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 const 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 const 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 const *bi = (struct bandInfoStruct const *) &bandInfo[j];
int *mp;
int cb, lwin;
short const *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] > SBLIMIT)
longLimit[j][i] = SBLIMIT;
}
for (i = 0; i < 14; i++) {
shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
if (shortLimit[j][i] > SBLIMIT)
shortLimit[j][i] = 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++) {
int l;
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
*/
static void
III_get_side_info_1(PMPSTR mp, int stereo,
int ms_stereo, long sfreq, int single)
{
int ch, gr;
int powdiff = (single == 3) ? 4 : 0;
mp->sideinfo.main_data_begin = getbits(mp, 9);
if (stereo == 1)
mp->sideinfo.private_bits = getbits_fast(mp, 5);
else
mp->sideinfo.private_bits = getbits_fast(mp, 3);
for (ch = 0; ch < stereo; ch++) {
mp->sideinfo.ch[ch].gr[0].scfsi = -1;
mp->sideinfo.ch[ch].gr[1].scfsi = getbits_fast(mp, 4);
}
for (gr = 0; gr < 2; gr++) {
for (ch = 0; ch < stereo; ch++) {
struct gr_info_s *gr_infos = &(mp->sideinfo.ch[ch].gr[gr]);
gr_infos->part2_3_length = getbits(mp, 12);
gr_infos->big_values = getbits_fast(mp, 9);
if (gr_infos->big_values > 288) {
lame_report_fnc(mp->report_err, "big_values too large! %i\n", gr_infos->big_values);
gr_infos->big_values = 288;
}
{
unsigned int qss = getbits_fast(mp, 8);
gr_infos->pow2gain = gainpow2 + 256 - qss + powdiff;
if (mp->pinfo != NULL) {
mp->pinfo->qss[gr][ch] = qss;
}
}
if (ms_stereo)
gr_infos->pow2gain += 2;
gr_infos->scalefac_compress = getbits_fast(mp, 4);
/* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */
if (get1bit(mp)) {
int i;
gr_infos->block_type = getbits_fast(mp, 2);
gr_infos->mixed_block_flag = get1bit(mp);
gr_infos->table_select[0] = getbits_fast(mp, 5);
gr_infos->table_select[1] = getbits_fast(mp, 5);
/*
* table_select[2] not needed, because there is no region2,
* but to satisfy some verifications tools we set it either.
*/
gr_infos->table_select[2] = 0;
for (i = 0; i < 3; i++) {
unsigned int sbg = (getbits_fast(mp, 3) << 3);
gr_infos->full_gain[i] = gr_infos->pow2gain + sbg;
if (mp->pinfo != NULL)
mp->pinfo->sub_gain[gr][ch][i] = sbg / 8;
}
if (gr_infos->block_type == 0) {
lame_report_fnc(mp->report_err, "Blocktype == 0 and window-switching == 1 not allowed.\n");
/* error seems to be very good recoverable, so don't exit */
/* exit(1); */
}
/* region_count/start parameters are implicit in this case. */
gr_infos->region1start = 36 >> 1;
gr_infos->region2start = 576 >> 1;
}
else {
unsigned int i, r0c, r1c, region0index, region1index;
for (i = 0; i < 3; i++)
gr_infos->table_select[i] = getbits_fast(mp, 5);
r0c = getbits_fast(mp, 4);
r1c = getbits_fast(mp, 3);
region0index = r0c+1;
if (region0index > 22) {
region0index = 22;
lame_report_fnc(mp->report_err, "region0index > 22\n");
}
region1index = r0c+1 + r1c+1;
if (region1index > 22) {
region1index = 22;
lame_report_fnc(mp->report_err, "region1index > 22\n");
}
gr_infos->region1start = bandInfo[sfreq].longIdx[region0index] >> 1;
gr_infos->region2start = bandInfo[sfreq].longIdx[region1index] >> 1;
gr_infos->block_type = 0;
gr_infos->mixed_block_flag = 0;
}
gr_infos->preflag = get1bit(mp);
gr_infos->scalefac_scale = get1bit(mp);
gr_infos->count1table_select = get1bit(mp);
}
}
}
/*
* Side Info for MPEG 2.0 / LSF
*/
static void
III_get_side_info_2(PMPSTR mp, int stereo, int ms_stereo, long sfreq, int single)
{
int ch;
int powdiff = (single == 3) ? 4 : 0;
mp->sideinfo.main_data_begin = getbits(mp, 8);
if (stereo == 1)
mp->sideinfo.private_bits = get1bit(mp);
else
mp->sideinfo.private_bits = getbits_fast(mp, 2);
for (ch = 0; ch < stereo; ch++) {
struct gr_info_s *gr_infos = &(mp->sideinfo.ch[ch].gr[0]);
unsigned int qss;
gr_infos->part2_3_length = getbits(mp, 12);
gr_infos->big_values = getbits_fast(mp, 9);
if (gr_infos->big_values > 288) {
lame_report_fnc(mp->report_err, "big_values too large! %i\n", gr_infos->big_values);
gr_infos->big_values = 288;
}
qss = getbits_fast(mp, 8);
gr_infos->pow2gain = gainpow2 + 256 - qss + powdiff;
if (mp->pinfo != NULL) {
mp->pinfo->qss[0][ch] = qss;
}
if (ms_stereo)
gr_infos->pow2gain += 2;
gr_infos->scalefac_compress = getbits(mp, 9);
/* window-switching flag == 1 for block_Type != 0 .. and block-type == 0 -> win-sw-flag = 0 */
if (get1bit(mp)) {
int i;
gr_infos->block_type = getbits_fast(mp, 2);
gr_infos->mixed_block_flag = get1bit(mp);
gr_infos->table_select[0] = getbits_fast(mp, 5);
gr_infos->table_select[1] = getbits_fast(mp, 5);
/*
* table_select[2] not needed, because there is no region2,
* but to satisfy some verifications tools we set it either.
*/
gr_infos->table_select[2] = 0;
for (i = 0; i < 3; i++) {
unsigned int sbg = (getbits_fast(mp, 3) << 3);
gr_infos->full_gain[i] = gr_infos->pow2gain + sbg;
if (mp->pinfo != NULL)
mp->pinfo->sub_gain[0][ch][i] = sbg / 8;
}
if (gr_infos->block_type == 0) {
lame_report_fnc(mp->report_err, "Blocktype == 0 and window-switching == 1 not allowed.\n");
/* error seems to be very good recoverable, so don't exit */
/* exit(1); */
}
/* region_count/start parameters are implicit in this case. */
/* check this again! */
if (gr_infos->block_type == 2) {
if (sfreq == 8)
gr_infos->region1start = 36;
else
gr_infos->region1start = 36 >> 1;
}
else if (sfreq == 8)
/* check this for 2.5 and sfreq=8 */
gr_infos->region1start = 108 >> 1;
else
gr_infos->region1start = 54 >> 1;
gr_infos->region2start = 576 >> 1;
}
else {
unsigned int i, r0c, r1c, region0index, region1index;
for (i = 0; i < 3; i++)
gr_infos->table_select[i] = getbits_fast(mp, 5);
r0c = getbits_fast(mp, 4);
r1c = getbits_fast(mp, 3);
region0index = r0c+1;
if (region0index > 22) {
region0index = 22;
lame_report_fnc(mp->report_err, "region0index > 22\n");
}
region1index = r0c+1 + r1c+1;
if (region1index > 22) {
region1index = 22;
lame_report_fnc(mp->report_err, "region1index > 22\n");
}
gr_infos->region1start = bandInfo[sfreq].longIdx[region0index] >> 1;
gr_infos->region2start = bandInfo[sfreq].longIdx[region1index] >> 1;
gr_infos->block_type = 0;
gr_infos->mixed_block_flag = 0;
}
gr_infos->scalefac_scale = get1bit(mp);
gr_infos->count1table_select = get1bit(mp);
}
}
/*
* read scalefactors
*/
static int
III_get_scale_factors_1(PMPSTR mp, int *scf, struct gr_info_s *gr_infos)
{
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_infos->scalefac_compress];
int num1 = slen[1][gr_infos->scalefac_compress];
if (gr_infos->block_type == 2) {
int i = 18;
numbits = (num0 + num1) * 18;
if (gr_infos->mixed_block_flag) {
for (i = 8; i; i--)
*scf++ = getbits_fast(mp, num0);
i = 9;
numbits -= num0; /* num0 * 17 + num1 * 18 */
}
for (; i; i--)
*scf++ = getbits_fast(mp, num0);
for (i = 18; i; i--)
*scf++ = getbits_fast(mp, num1);
*scf++ = 0;
*scf++ = 0;
*scf++ = 0; /* short[13][0..2] = 0 */
}
else {
int i;
int scfsi = gr_infos->scfsi;
if (scfsi < 0) { /* scfsi < 0 => granule == 0 */
for (i = 11; i; i--)
*scf++ = getbits_fast(mp, num0);
for (i = 10; i; i--)
*scf++ = getbits_fast(mp, num1);
numbits = (num0 + num1) * 10 + num0;
}
else {
numbits = 0;
if (!(scfsi & 0x8)) {
for (i = 6; i; i--)
*scf++ = getbits_fast(mp, num0);
numbits += num0 * 6;
}
else {
scf += 6;
}
if (!(scfsi & 0x4)) {
for (i = 5; i; i--)
*scf++ = getbits_fast(mp, num0);
numbits += num0 * 5;
}
else {
scf += 5;
}
if (!(scfsi & 0x2)) {
for (i = 5; i; i--)
*scf++ = getbits_fast(mp, num1);
numbits += num1 * 5;
}
else {
scf += 5;
}
if (!(scfsi & 0x1)) {
for (i = 5; i; i--)
*scf++ = getbits_fast(mp, num1);
numbits += num1 * 5;
}
else {
scf += 5;
}
}
*scf++ = 0; /* no l[21] in original sources */
}
return numbits;
}
static int
III_get_scale_factors_2(PMPSTR mp, int *scf, struct gr_info_s *gr_infos, int i_stereo)
{
unsigned char const *pnt;
int i, j;
unsigned int slen;
int n = 0;
int numbits = 0;
/* *INDENT-OFF* */
static const 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} } };
/* *INDENT-ON* */
if (i_stereo) /* i_stereo AND second channel -> do_layer3() checks this */
slen = i_slen2[gr_infos->scalefac_compress >> 1];
else
slen = n_slen2[gr_infos->scalefac_compress];
gr_infos->preflag = (slen >> 15) & 0x1;
n = 0;
if (gr_infos->block_type == 2) {
n++;
if (gr_infos->mixed_block_flag)
n++;
}
pnt = (unsigned char const *) 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(mp, 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;
}
/* *INDENT-OFF* */
static const 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}; /* char enough ? */
static const 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};
/* *INDENT-ON* */
/*
* don't forget to apply the same changes to III_dequantize_sample_ms() !!!
*/
static int
III_dequantize_sample(PMPSTR mp, real xr[SBLIMIT][SSLIMIT], int *scf,
struct gr_info_s *gr_infos, int sfreq, int part2bits)
{
int shift = 1 + gr_infos->scalefac_scale;
real *xrpnt = (real *) xr;
int l[3], l3;
int part2remain = gr_infos->part2_3_length - part2bits;
int *me;
/* lame_report_fnc(mp->report_dbg,"part2remain = %d, gr_infos->part2_3_length = %d, part2bits = %d\n",
part2remain, gr_infos->part2_3_length, part2bits); */
{
int i;
for (i = (&xr[SBLIMIT][0] - xrpnt) >> 1; i > 0; i--) {
*xrpnt++ = 0.0;
*xrpnt++ = 0.0;
}
xrpnt = (real *) xr;
}
{
int bv = gr_infos->big_values;
int region1 = gr_infos->region1start;
int region2 = gr_infos->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;
}
}
}
/* MDH crash fix */
{
int i;
for (i = 0; i < 3; i++) {
if (l[i] < 0) {
lame_report_fnc(mp->report_err, "hip: Bogus region length (%d)\n", l[i]);
l[i] = 0;
}
}
}
/* end MDH crash fix */
if (gr_infos->block_type == 2) {
/*
* decoding with short or mixed mode BandIndex table
*/
int i, max[4];
int step = 0, lwin = 0, cb = 0;
real v = 0.0;
int *m, mc;
if (gr_infos->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 const *h = (struct newhuff const *) (ht + gr_infos->table_select[i]);
for (; lp; lp--, mc--) {
int x, y;
if ((!mc)) {
mc = *m++;
xrpnt = ((real *) xr) + (*m++);
lwin = *m++;
cb = *m++;
if (lwin == 3) {
v = gr_infos->pow2gain[(*scf++) << shift];
step = 1;
}
else {
v = gr_infos->full_gain[lwin][(*scf++) << shift];
step = 3;
}
}
{
short const *val = (short const *) h->table;
while ((y = *val++) < 0) {
if (get1bit(mp))
val -= y;
part2remain--;
}
x = y >> 4;
y &= 0xf;
}
if (x == 15) {
max[lwin] = cb;
part2remain -= h->linbits + 1;
x += getbits(mp, (int) h->linbits);
if (get1bit(mp))
*xrpnt = -ispow[x] * v;
else
*xrpnt = ispow[x] * v;
}
else if (x) {
max[lwin] = cb;
if (get1bit(mp))
*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(mp, (int) h->linbits);
if (get1bit(mp))
*xrpnt = -ispow[y] * v;
else
*xrpnt = ispow[y] * v;
}
else if (y) {
max[lwin] = cb;
if (get1bit(mp))
*xrpnt = -ispow[y] * v;
else
*xrpnt = ispow[y] * v;
part2remain--;
}
else
*xrpnt = 0.0;
xrpnt += step;
}
}
for (; l3 && (part2remain > 0); l3--) {
struct newhuff const *h = (struct newhuff const *) (htc + gr_infos->count1table_select);
short const *val = (short const *) h->table;
short a;
while ((a = *val++) < 0) {
part2remain--;
if (part2remain < 0) {
part2remain++;
a = 0;
break;
}
if (get1bit(mp))
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_infos->pow2gain[(*scf++) << shift];
step = 1;
}
else {
v = gr_infos->full_gain[lwin][(*scf++) << shift];
step = 3;
}
}
mc--;
}
if ((a & (0x8 >> i))) {
max[lwin] = cb;
part2remain--;
if (part2remain < 0) {
part2remain++;
break;
}
if (get1bit(mp))
*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_infos->maxband[0] = max[0] + 1;
gr_infos->maxband[1] = max[1] + 1;
gr_infos->maxband[2] = max[2] + 1;
gr_infos->maxbandl = max[3] + 1;
{
int rmax = max[0] > max[1] ? max[0] : max[1];
rmax = (rmax > max[2] ? rmax : max[2]) + 1;
gr_infos->maxb = rmax ? shortLimit[sfreq][rmax] : longLimit[sfreq][max[3] + 1];
}
}
else {
/*
* decoding with 'long' BandIndex table (block_type != 2)
*/
int const *pretab = (int const *) (gr_infos->preflag ? pretab1 : pretab2);
int i, max = -1;
int cb = 0;
int *m = map[sfreq][2];
real v = 0.0;
int mc = 0;
/*
* long hash table values
*/
for (i = 0; i < 3; i++) {
int lp = l[i];
struct newhuff const *h = (struct newhuff const *) (ht + gr_infos->table_select[i]);
for (; lp; lp--, mc--) {
int x, y;
if (!mc) {
mc = *m++;
v = gr_infos->pow2gain[((*scf++) + (*pretab++)) << shift];
cb = *m++;
}
{
short const *val = (short const *) h->table;
while ((y = *val++) < 0) {
if (get1bit(mp))
val -= y;
part2remain--;
}
x = y >> 4;
y &= 0xf;
}
if (x == 15) {
max = cb;
part2remain -= h->linbits + 1;
x += getbits(mp, (int) h->linbits);
if (get1bit(mp))
*xrpnt++ = -ispow[x] * v;
else
*xrpnt++ = ispow[x] * v;
}
else if (x) {
max = cb;
if (get1bit(mp))
*xrpnt++ = -ispow[x] * v;
else