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mpglib.c
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mpglib.c
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/*
* Mpeg Layer-3 audio decoder
* --------------------------
*
* Nearly all of this code has been borrowed from the mpglib program
* written by Michael Hipp. For the original mpglib code, see
* http://ftp.tu-clausthal.de/pub/unix/audio/mpg123 and
* http://www.mpg123.de/
*
* Copyright (c) 1995,1996,1997 by Michael Hipp. All rights reserved.
*/
#include <ctype.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "mpglib.h"
/************************************************************************
* Code from mpglib common.c *
************************************************************************/
struct parameter param = {1, 1, 0, 0};
int tabsel_123[2][3][16] = {
{ {0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448,},
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384,},
{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320,}},
{ {0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256,},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,}}
};
long freqs[9] = {44100, 48000, 32000, 22050, 24000, 16000,
11025, 12000, 8000};
int bitindex;
unsigned char *wordpointer;
unsigned char *pcm_sample;
int pcm_point = 0;
/*
* decode a header and write the information
* into the frame structure
*/
int decode_header(struct frame * fr, unsigned long newhead)
{
if (newhead & (1 << 20)) {
fr->lsf = (newhead & (1 << 19)) ? 0x0 : 0x1;
fr->mpeg25 = 0;
} else {
fr->lsf = 1;
fr->mpeg25 = 1;
}
// fr->lay = 4 - ((newhead >> 17) & 3);
//#warning: lay=3 is a dirty hack
fr->lay = 3;
if (((newhead >> 10) & 0x3) == 0x3) {
// fprintf(stderr, " l.65: Stream error \n");
// exit(1);
return(0); /* JP */
}
if (fr->mpeg25) {
fr->sampling_frequency = 6 + ((newhead >> 10) & 0x3);
} else
fr->sampling_frequency = ((newhead >> 10) & 0x3) + (fr->lsf * 3);
fr->error_protection = ((newhead >> 16) & 0x1) ^ 0x1;
// if (fr->mpeg25) /* allow Bitrate change for 2.5 ... */
// fr->bitrate_index = ((newhead >> 12) & 0xf);
fr->bitrate_index = ((newhead >> 12) & 0xf);
fr->padding = ((newhead >> 9) & 0x1);
fr->extension = ((newhead >> 8) & 0x1);
fr->mode = ((newhead >> 6) & 0x3);
fr->mode_ext = ((newhead >> 4) & 0x3);
fr->copyright = ((newhead >> 3) & 0x1);
fr->original = ((newhead >> 2) & 0x1);
fr->emphasis = newhead & 0x3;
fr->stereo = (fr->mode == MPG_MD_MONO) ? 1 : 2;
if (!fr->bitrate_index) {
//fprintf(stderr, "l.89: Free format not supported.\n");
return (0);
}
switch (fr->lay) {
case 1:
#ifdef LAYER1
#if 0
fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
(fr->mode_ext<<2)+4 : 32;
#endif
fr->framesize = (long) tabsel_123[fr->lsf][0][fr->bitrate_index] * 12000;
fr->framesize /= freqs[fr->sampling_frequency];
fr->framesize = ((fr->framesize+fr->padding)<<2)-4;
#else
fprintf(stderr,"Not supported!\n");
#endif
break;
case 2:
#ifdef LAYER2
#if 0
fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ?
(fr->mode_ext<<2)+4 : fr->II_sblimit;
#endif
fr->framesize = (long) tabsel_123[fr->lsf][1][fr->bitrate_index] * 144000;
fr->framesize /= freqs[fr->sampling_frequency];
fr->framesize += fr->padding - 4;
#else
//fprintf(stderr, " l.95: Not supported!\n");
#endif
break;
case 3:
#if 0
fr->do_layer = do_layer3;
if(fr->lsf)
ssize = (fr->stereo == 1) ? 9 : 17;
else
ssize = (fr->stereo == 1) ? 17 : 32;
#endif
#if 0
if(fr->error_protection)
ssize += 2;
#endif
fr->framesize = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] * 144000;
fr->framesize /= freqs[fr->sampling_frequency] << (fr->lsf);
fr->framesize = fr->framesize + fr->padding - 4;
break;
default:
//fprintf(stderr, " l.103: Sorry, unknown layer type.\n");
return (0);
}
return 1;
}
unsigned int getbits(int number_of_bits)
{
unsigned long rval;
if (!number_of_bits)
return 0;
{
rval = wordpointer[0];
rval <<= 8;
rval |= wordpointer[1];
rval <<= 8;
rval |= wordpointer[2];
rval <<= bitindex;
rval &= 0xffffff;
bitindex += number_of_bits;
rval >>= (24 - number_of_bits);
wordpointer += (bitindex >> 3);
bitindex &= 7;
}
return rval;
}
unsigned int getbits_fast(int number_of_bits)
{
unsigned long rval;
{
rval = wordpointer[0];
rval <<= 8;
rval |= wordpointer[1];
rval <<= bitindex;
rval &= 0xffff;
bitindex += number_of_bits;
rval >>= (16 - number_of_bits);
wordpointer += (bitindex >> 3);
bitindex &= 7;
}
return rval;
}
unsigned int get1bit(void)
{
unsigned char rval;
rval = *wordpointer << bitindex;
bitindex++;
wordpointer += (bitindex >> 3);
bitindex &= 7;
return rval >> 7;
}
/************************************************************************
* Code from mpglib layer3.c *
************************************************************************/
/* Global mp .. it's a hack */
struct mpstr *gmp=NULL;
static real ispow[8207];
static real gainpow2[256 + 118 + 4];
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 */
//#define MPGLIB02a // experimental
#ifdef MPGLIB02a
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];
#endif
/*
* 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((real) 2.0, -0.25 * (real) (i + 210));
for (i = 0; i < 8207; i++)
ispow[i] = pow((real) i, (real) 4.0 / 3.0);
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);
}
}
}
#ifdef MPGLIB02a
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;
}
}
#endif
}
/*
* read additional side information
*/
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, "l.403: 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);
gr_info->block_type = 1; /* JP: dirty hack! */
if (gr_info->block_type == 0) {
fprintf(stderr," l.429: 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;
}
/*
* 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,"l. 478: 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);
gr_info->block_type = 1; /* JP: dirty hack! */
if(gr_info->block_type == 0) {
fprintf(stderr,"l.502: 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
*/
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;
}
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, real * Energy)
{
int shift = 1 + gr_info->scalefac_scale;
real *xrpnt = (real *) xr;
real energy = 0.0;
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 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;
energy += *xrpnt * *xrpnt;
} else if (x) {
max[lwin] = cb;
if (get1bit())
*xrpnt = -ispow[x] * v;
else
*xrpnt = ispow[x] * v;
energy += *xrpnt * *xrpnt;
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;
energy += *xrpnt * *xrpnt;
} else if (y) {
max[lwin] = cb;
if (get1bit())
*xrpnt = -ispow[y] * v;
else
*xrpnt = ispow[y] * v;
energy += *xrpnt * *xrpnt;
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;
energy += *xrpnt * *xrpnt;
} 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;
/* 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;
energy += *xrpnt * *xrpnt;
xrpnt++;
} else if (x) {
max = cb;
if (get1bit())
*xrpnt = -ispow[x] * v;
else
*xrpnt = ispow[x] * v;
energy += *xrpnt * *xrpnt;
xrpnt++;
part2remain--;
} else
*xrpnt++ = 0.0;