WebSVN - shark - Rev 3 - /shark/trunk/ports/mpg123/layer3.c

/*
* Mpeg Layer-3 audio decoder
* --------------------------
* copyright (c) 1995,1996,1997 by Michael Hipp.
* All rights reserved. See also 'README'
*
* - I'm currently working on that .. needs a few more optimizations,
* though the code is now fast enough to run in realtime on a 100Mhz 486
* - a few personal notes are in german ..
*
* used source:
* mpeg1_iis package
*/

#include "mpg123.h"
#include "huffman.h"

#if 0
#include "get1bit.h"
#endif

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];
#ifdef NEW_DCT9
static real cos9[3],cos18[3];
#endif

struct bandInfoStruct {
int longIdx[23];
int longDiff[22];
int shortIdx[14];
int shortDiff[13];
};

int longLimit[7][23];
int shortLimit[7][14];

struct bandInfoStruct bandInfo[7] = {

/* 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, wrong! table (it's just a copy of MPEG 2.0/44.1kHz) */
{ {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 } } ,
};

static int mapbuf0[7][152];
static int mapbuf1[7][156];
static int mapbuf2[7][44];
static int *map[7][3];
static int *mapend[7][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];

/*
* init tables for layer-3
*/
void init_layer3(int down_samp)
{
int i,j,k,l;

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 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);

#ifdef NEW_DCT9
cos9[0] = cos(1.0*M_PI/9.0);
cos9[1] = cos(5.0*M_PI/9.0);
cos9[2] = cos(7.0*M_PI/9.0);
cos18[0] = cos(1.0*M_PI/18.0);
cos18[1] = cos(11.0*M_PI/18.0);
cos18[2] = cos(13.0*M_PI/18.0);
#endif

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 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<7;j++)
{
struct bandInfoStruct *bi = &bandInfo[j];
int *mp;
int cb,lwin;
int *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<7;j++) {
for(i=0;i<23;i++) {
longLimit[j][i] = (bandInfo[j].longIdx[i] - 1 + 8) / 18 + 1;
if(longLimit[j][i] > (SBLIMIT >> down_samp) )
longLimit[j][i] = SBLIMIT >> down_samp;
}
for(i=0;i<14;i++) {
shortLimit[j][i] = (bandInfo[j].shortIdx[i] - 1) / 18 + 1;
if(shortLimit[j][i] > (SBLIMIT >> down_samp) )
shortLimit[j][i] = SBLIMIT >> down_samp;
}
}

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);
}
}
}
}

/*
* read additional side information
*/
static void 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);
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);

if(gr_info->block_type == 0) {
fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n");
exit(1);
}
/* 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();
}
}
}

/*
* Side Info for MPEG 2.0 / LSF
*/
static void 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);
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);

if(gr_info->block_type == 0) {
fprintf(stderr,"Blocktype == 0 and window-switching == 1 not allowed.\n");
exit(1);
}
/* region_count/start parameters are implicit in this case. */
/* check this again! */
if(gr_info->block_type == 2)
gr_info->region1start = 36>>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();
}
}

/*
* read scalefactors
*/
static int III_get_scale_factors_1(int *scf,struct gr_info_s *gr_info)
{
static 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;
}
else {
numbits = 0;
if(!(scfsi & 0x8)) {
for (i=6;i;i--)
*scf++ = getbits_fast(num0);
numbits += num0 * 6;
}
else {
*scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */
*scf++ = 0; *scf++ = 0; *scf++ = 0;
}

if(!(scfsi & 0x4)) {
for (i=5;i;i--)
*scf++ = getbits_fast(num0);
numbits += num0 * 5;
}
else {
*scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */
*scf++ = 0; *scf++ = 0;
}

if(!(scfsi & 0x2)) {
for(i=5;i;i--)
*scf++ = getbits_fast(num1);
numbits += num1 * 5;
}
else {
*scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */
*scf++ = 0; *scf++ = 0;
}

if(!(scfsi & 0x1)) {
for (i=5;i;i--)
*scf++ = getbits_fast(num1);
numbits += num1 * 5;
}
else {
*scf++ = 0; *scf++ = 0; *scf++ = 0; /* set to ZERO necessary? */
*scf++ = 0; *scf++ = 0;
}
}

*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<pnt[i];j++)
*scf++ = getbits(num);
numbits += pnt[i] * num;
}
else {
for(j=0;j<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)
{
int shift = 1 + gr_info->scalefac_scale;
real *xrpnt = (real *) xr;
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) {
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;
}
else if(x) {
max[lwin] = cb;
if(get1bit())
*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(h->linbits);
if(get1bit())
*xrpnt = -ispow[y] * v;
else
*xrpnt = ispow[y] * v;
}
else if(y) {
max[lwin] = cb;
if(get1bit())
*xrpnt = -ispow[y] * v;
else
*xrpnt = ispow[y] * v;
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;
}
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;
}

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 {
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;
me = mapend[sfreq][2];

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;
}
else if(x) {
max = cb;
if(get1bit())
*xrpnt++ = -ispow[x] * v;
else
*xrpnt++ = ispow[x] * v;
part2remain--;
}
else
*xrpnt++ = 0.0;

if (y == 15) {
max = cb;
part2remain -= h->linbits+1;
y += getbits(h->linbits);
if(get1bit())
*xrpnt++ = -ispow[y] * v;
else
*xrpnt++ = ispow[y] * v;
}
else if(y) {
max = cb;
if(get1bit())
*xrpnt++ = -ispow[y] * v;
else
*xrpnt++ = ispow[y] * v;
part2remain--;
}
else
*xrpnt++ = 0.0;
}
}

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++;
cb = *m++;
v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
}
mc--;
}
if ( (a & (0x8>>i)) ) {
max = cb;
part2remain--;
if(part2remain < 0) {
part2remain++;
break;
}
if(get1bit())
*xrpnt++ = -v;
else
*xrpnt++ = v;
}
else
*xrpnt++ = 0.0;
}
}
for(i=(&xr[SBLIMIT][SSLIMIT]-xrpnt)>>1;i;i--) {
*xrpnt++ = 0.0;
*xrpnt++ = 0.0;
}

gr_info->maxbandl = max+1;
gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
}

while( part2remain > 16 ) {
getbits(16); /* Dismiss stuffing Bits */
part2remain -= 16;
}
if(part2remain > 0)
getbits(part2remain);
else if(part2remain < 0) {
fprintf(stderr,"mpg123: Can't rewind stream by %d bits!\n",-part2remain);
return 1; /* -> error */
}
return 0;
}

static int III_dequantize_sample_ms(real xr[2][SBLIMIT][SSLIMIT],int *scf,
struct gr_info_s *gr_info,int sfreq,int part2bits)
{
int shift = 1 + gr_info->scalefac_scale;
real *xrpnt = (real *) xr[1];
real *xr0pnt = (real *) xr[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 gain
*/
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) {
int i,max[4];
int step=0,lwin=0,cb=0;
register real v = 0.0;
register int *m,mc = 0;

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];
}

for(i=0;i<2;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++;
xrpnt = ((real *) xr[1]) + *m;
xr0pnt = ((real *) xr[0]) + *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()) {
real a = ispow[x] * v;
*xrpnt = *xr0pnt + a;
*xr0pnt -= a;
}
else {
real a = ispow[x] * v;
*xrpnt = *xr0pnt - a;
*xr0pnt += a;
}
}
else if(x) {
max[lwin] = cb;
if(get1bit()) {
real a = ispow[x] * v;
*xrpnt = *xr0pnt + a;
*xr0pnt -= a;
}
else {
real a = ispow[x] * v;
*xrpnt = *xr0pnt - a;
*xr0pnt += a;
}
part2remain--;
}
else
*xrpnt = *xr0pnt;
xrpnt += step;
xr0pnt += step;

if(y == 15) {
max[lwin] = cb;
part2remain -= h->linbits+1;
y += getbits(h->linbits);
if(get1bit()) {
real a = ispow[y] * v;
*xrpnt = *xr0pnt + a;
*xr0pnt -= a;
}
else {
real a = ispow[y] * v;
*xrpnt = *xr0pnt - a;
*xr0pnt += a;
}
}
else if(y) {
max[lwin] = cb;
if(get1bit()) {
real a = ispow[y] * v;
*xrpnt = *xr0pnt + a;
*xr0pnt -= a;
}
else {
real a = ispow[y] * v;
*xrpnt = *xr0pnt - a;
*xr0pnt += a;
}
part2remain--;
}
else
*xrpnt = *xr0pnt;
xrpnt += step;
xr0pnt += 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[1]) + *m;
xr0pnt = ((real *) xr[0]) + *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 = *xr0pnt + v;
*xr0pnt -= v;
}
else {
*xrpnt = *xr0pnt - v;
*xr0pnt += v;
}
}
else
*xrpnt = *xr0pnt;
xrpnt += step;
xr0pnt += step;
}
}

while( m < me ) {
if(!mc) {
mc = *m++;
xrpnt = ((real *) xr) + *m;
xr0pnt = ((real *) xr) + *m++;
if(*m++ == 3)
step = 1;
else
step = 3;
m++; /* cb */
}
mc--;
*xrpnt = *xr0pnt;
xrpnt += step;
xr0pnt += step;
*xrpnt = *xr0pnt;
xrpnt += step;
xr0pnt += step;
}

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 {
int *pretab = gr_info->preflag ? pretab1 : pretab2;
int i,max = -1;
int cb = 0;
register int mc=0,*m = map[sfreq][2];
register real v = 0.0;
me = mapend[sfreq][2];

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++;
cb = *m++;
v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
}
{
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()) {
real a = ispow[x] * v;
*xrpnt++ = *xr0pnt + a;
*xr0pnt++ -= a;
}
else {
real a = ispow[x] * v;
*xrpnt++ = *xr0pnt - a;
*xr0pnt++ += a;
}
}
else if(x) {
max = cb;
if(get1bit()) {
real a = ispow[x] * v;
*xrpnt++ = *xr0pnt + a;
*xr0pnt++ -= a;
}
else {
real a = ispow[x] * v;
*xrpnt++ = *xr0pnt - a;
*xr0pnt++ += a;
}
part2remain--;
}
else
*xrpnt++ = *xr0pnt++;

if (y == 15) {
max = cb;
part2remain -= h->linbits+1;
y += getbits(h->linbits);
if(get1bit()) {
real a = ispow[y] * v;
*xrpnt++ = *xr0pnt + a;
*xr0pnt++ -= a;
}
else {
real a = ispow[y] * v;
*xrpnt++ = *xr0pnt - a;
*xr0pnt++ += a;
}
}
else if(y) {
max = cb;
if(get1bit()) {
real a = ispow[y] * v;
*xrpnt++ = *xr0pnt + a;
*xr0pnt++ -= a;
}
else {
real a = ispow[y] * v;
*xrpnt++ = *xr0pnt - a;
*xr0pnt++ += a;
}
part2remain--;
}
else
*xrpnt++ = *xr0pnt++;
}
}

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++;
cb = *m++;
v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
}
mc--;
}
if ( (a & (0x8>>i)) ) {
max = cb;
part2remain--;
if(part2remain <= 0) {
part2remain++;
break;
}
if(get1bit()) {
*xrpnt++ = *xr0pnt + v;
*xr0pnt++ -= v;
}
else {
*xrpnt++ = *xr0pnt - v;
*xr0pnt++ += v;
}
}
else
*xrpnt++ = *xr0pnt++;
}
}
for(i=(&xr[1][SBLIMIT][SSLIMIT]-xrpnt)>>1;i;i--) {
*xrpnt++ = *xr0pnt++;
*xrpnt++ = *xr0pnt++;
}

gr_info->maxbandl = max+1;
gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
}

while ( part2remain > 16 ) {
getbits(16); /* Dismiss stuffing Bits */
part2remain -= 16;
}
if(part2remain > 0 )
getbits(part2remain);
else if(part2remain < 0) {
fprintf(stderr,"mpg123_ms: Can't rewind stream by %d bits!\n",-part2remain);
return 1; /* -> error */
}
return 0;
}

/*
* III_stereo: calculate real channel values for Joint-I-Stereo-mode
*/
static void III_i_stereo(real xr_buf[2][SBLIMIT][SSLIMIT],int *scalefac,
struct gr_info_s *gr_info,int sfreq,int ms_stereo,int lsf)
{
real (*xr)[SBLIMIT*SSLIMIT] = (real (*)[SBLIMIT*SSLIMIT] ) xr_buf;
struct bandInfoStruct *bi = &bandInfo[sfreq];
real *tab1,*tab2;

if(lsf) {
int p = gr_info->scalefac_compress & 0x1;
if(ms_stereo) {
tab1 = pow1_2[p]; tab2 = pow2_2[p];
}
else {
tab1 = pow1_1[p]; tab2 = pow2_1[p];
}
}
else {
if(ms_stereo) {
tab1 = tan1_2; tab2 = tan2_2;
}
else {
tab1 = tan1_1; tab2 = tan2_1;
}
}

if (gr_info->block_type == 2)
{
int lwin,do_l = 0;
if( gr_info->mixed_block_flag )
do_l = 1;

for (lwin=0;lwin<3;lwin++) /* process each window */
{
/* get first band with zero values */
int is_p,sb,idx,sfb = gr_info->maxband[lwin]; /* sfb is minimal 3 for mixed mode */
if(sfb > 3)
do_l = 0;

for(;sfb<12;sfb++)
{
is_p = scalefac[sfb*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
if(is_p != 7) {
real t1,t2;
sb = bi->shortDiff[sfb];
idx = bi->shortIdx[sfb] + lwin;
t1 = tab1[is_p]; t2 = tab2[is_p];
for (; sb > 0; sb--,idx+=3)
{
real v = xr[0][idx];
xr[0][idx] = v * t1;
xr[1][idx] = v * t2;
}
}
}

#if 1
/* in the original: copy 10 to 11 , here: copy 11 to 12
maybe still wrong??? (copy 12 to 13?) */
is_p = scalefac[11*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
sb = bi->shortDiff[12];
idx = bi->shortIdx[12] + lwin;
#else
is_p = scalefac[10*3+lwin-gr_info->mixed_block_flag]; /* scale: 0-15 */
sb = bi->shortDiff[11];
idx = bi->shortIdx[11] + lwin;
#endif
if(is_p != 7)
{
real t1,t2;
t1 = tab1[is_p]; t2 = tab2[is_p];
for ( ; sb > 0; sb--,idx+=3 )
{
real v = xr[0][idx];
xr[0][idx] = v * t1;
xr[1][idx] = v * t2;
}
}
} /* end for(lwin; .. ; . ) */

if (do_l)
{
/* also check l-part, if ALL bands in the three windows are 'empty'
* and mode = mixed_mode
*/
int sfb = gr_info->maxbandl;
int idx = bi->longIdx[sfb];

for ( ; sfb<8; sfb++ )
{
int sb = bi->longDiff[sfb];
int is_p = scalefac[sfb]; /* scale: 0-15 */
if(is_p != 7) {
real t1,t2;
t1 = tab1[is_p]; t2 = tab2[is_p];
for ( ; sb > 0; sb--,idx++)
{
real v = xr[0][idx];
xr[0][idx] = v * t1;
xr[1][idx] = v * t2;
}
}
else
idx += sb;
}
}
}
else /* ((gr_info->block_type != 2)) */
{
int sfb = gr_info->maxbandl;
int is_p,idx = bi->longIdx[sfb];
for ( ; sfb<21; sfb++)
{
int sb = bi->longDiff[sfb];
is_p = scalefac[sfb]; /* scale: 0-15 */
if(is_p != 7) {
real t1,t2;
t1 = tab1[is_p]; t2 = tab2[is_p];
for ( ; sb > 0; sb--,idx++)
{
real v = xr[0][idx];
xr[0][idx] = v * t1;
xr[1][idx] = v * t2;
}
}
else
idx += sb;
}

is_p = scalefac[20]; /* copy l-band 20 to l-band 21 */
if(is_p != 7)
{
int sb;
real t1 = tab1[is_p],t2 = tab2[is_p];

for ( sb = bi->longDiff[21]; sb > 0; sb--,idx++ )
{
real v = xr[0][idx];
xr[0][idx] = v * t1;
xr[1][idx] = v * t2;
}
}
} /* ... */
}

static void III_antialias(real xr[SBLIMIT][SSLIMIT],struct gr_info_s *gr_info)
{
int sblim;

if(gr_info->block_type == 2)
{
if(!gr_info->mixed_block_flag)
return;
sblim = 1;
}
else {
sblim = gr_info->maxb-1;
}

/* 31 alias-reduction operations between each pair of sub-bands */
/* with 8 butterflies between each pair */

{
int sb;
real *xr1=(real *) xr[1];

for(sb=sblim;sb;sb--,xr1+=10)
{
int ss;
real *cs=aa_cs,*ca=aa_ca;
real *xr2 = xr1;

for(ss=7;ss>=0;ss--)
{ /* upper and lower butterfly inputs */
register real bu = *--xr2,bd = *xr1;
*xr2 = (bu * (*cs) ) - (bd * (*ca) );
*xr1++ = (bd * (*cs++) ) + (bu * (*ca++) );
}
}
}
}

/*
// This is an optimized DCT from Jeff Tsay's maplay 1.2+ package.
// Saved one multiplication by doing the 'twiddle factor' stuff
// together with the window mul. (MH)
//
// This uses Byeong Gi Lee's Fast Cosine Transform algorithm, but the
// 9 point IDCT needs to be reduced further. Unfortunately, I don't
// know how to do that, because 9 is not an even number. - Jeff.
//
//////////////////////////////////////////////////////////////////
//
// 9 Point Inverse Discrete Cosine Transform
//
// This piece of code is Copyright 1997 Mikko Tommila and is freely usable
// by anybody. The algorithm itself is of course in the public domain.
//
// Again derived heuristically from the 9-point WFTA.
//
// The algorithm is optimized (?) for speed, not for small rounding errors or
// good readability.
//
// 36 additions, 11 multiplications
//
// Again this is very likely sub-optimal.
//
// The code is optimized to use a minimum number of temporary variables,
// so it should compile quite well even on 8-register Intel x86 processors.
// This makes the code quite obfuscated and very difficult to understand.
//
// References:
// [1] S. Winograd: "On Computing the Discrete Fourier Transform",
// Mathematics of Computation, Volume 32, Number 141, January 1978,
// Pages 175-199
*/

/*------------------------------------------------------------------*/
/* */
/* Function: Calculation of the inverse MDCT */
/* */
/*------------------------------------------------------------------*/

static void dct36(real *inbuf,real *o1,real *o2,real *wintab,real *tsbuf)
{
#ifdef NEW_DCT9
real tmp[18];
#endif

{
register real *in = inbuf;

in[17]+=in[16]; in[16]+=in[15]; in[15]+=in[14];
in[14]+=in[13]; in[13]+=in[12]; in[12]+=in[11];
in[11]+=in[10]; in[10]+=in[9]; in[9] +=in[8];
in[8] +=in[7]; in[7] +=in[6]; in[6] +=in[5];
in[5] +=in[4]; in[4] +=in[3]; in[3] +=in[2];
in[2] +=in[1]; in[1] +=in[0];

in[17]+=in[15]; in[15]+=in[13]; in[13]+=in[11]; in[11]+=in[9];
in[9] +=in[7]; in[7] +=in[5]; in[5] +=in[3]; in[3] +=in[1];

#ifdef NEW_DCT9
{
real t0, t1, t2, t3, t4, t5, t6, t7;

t1 = COS6_2 * in[12];
t2 = COS6_2 * (in[8] + in[16] - in[4]);

t3 = in[0] + t1;
t4 = in[0] - t1 - t1;
t5 = t4 - t2;

t0 = cos9[0] * (in[4] + in[8]);
t1 = cos9[1] * (in[8] - in[16]);

tmp[4] = t4 + t2 + t2;
t2 = cos9[2] * (in[4] + in[16]);

t6 = t3 - t0 - t2;
t0 += t3 + t1;
t3 += t2 - t1;

t2 = cos18[0] * (in[2] + in[10]);
t4 = cos18[1] * (in[10] - in[14]);
t7 = COS6_1 * in[6];

t1 = t2 + t4 + t7;
tmp[0] = t0 + t1;
tmp[8] = t0 - t1;
t1 = cos18[2] * (in[2] + in[14]);
t2 += t1 - t7;

tmp[3] = t3 + t2;
t0 = COS6_1 * (in[10] + in[14] - in[2]);
tmp[5] = t3 - t2;

t4 -= t1 + t7;

tmp[1] = t5 - t0;
tmp[7] = t5 + t0;
tmp[2] = t6 + t4;
tmp[6] = t6 - t4;
}

{
real t0, t1, t2, t3, t4, t5, t6, t7;

t1 = COS6_2 * in[13];
t2 = COS6_2 * (in[9] + in[17] - in[5]);

t3 = in[1] + t1;
t4 = in[1] - t1 - t1;
t5 = t4 - t2;

t0 = cos9[0] * (in[5] + in[9]);
t1 = cos9[1] * (in[9] - in[17]);

tmp[13] = (t4 + t2 + t2) * tfcos36[17-13];
t2 = cos9[2] * (in[5] + in[17]);

t6 = t3 - t0 - t2;
t0 += t3 + t1;
t3 += t2 - t1;

t2 = cos18[0] * (in[3] + in[11]);
t4 = cos18[1] * (in[11] - in[15]);
t7 = COS6_1 * in[7];

t1 = t2 + t4 + t7;
tmp[17] = (t0 + t1) * tfcos36[17-17];
tmp[9] = (t0 - t1) * tfcos36[17-9];
t1 = cos18[2] * (in[3] + in[15]);
t2 += t1 - t7;

tmp[14] = (t3 + t2) * tfcos36[17-14];
t0 = COS6_1 * (in[11] + in[15] - in[3]);
tmp[12] = (t3 - t2) * tfcos36[17-12];

t4 -= t1 + t7;

tmp[16] = (t5 - t0) * tfcos36[17-16];
tmp[10] = (t5 + t0) * tfcos36[17-10];
tmp[15] = (t6 + t4) * tfcos36[17-15];
tmp[11] = (t6 - t4) * tfcos36[17-11];
}

#define MACRO(v) { \
real tmpval; \
real sum0 = tmp[(v)]; \
real sum1 = tmp[17-(v)]; \
out2[9+(v)] = (tmpval = sum0 + sum1) * w[27+(v)]; \
out2[8-(v)] = tmpval * w[26-(v)]; \
sum0 -= sum1; \
ts[SBLIMIT*(8-(v))] = out1[8-(v)] + sum0 * w[8-(v)]; \
ts[SBLIMIT*(9+(v))] = out1[9+(v)] + sum0 * w[9+(v)]; }

{
register real *out2 = o2;
register real *w = wintab;
register real *out1 = o1;
register real *ts = tsbuf;

MACRO(0);
MACRO(1);
MACRO(2);
MACRO(3);
MACRO(4);
MACRO(5);
MACRO(6);
MACRO(7);
MACRO(8);
}

#else

{

#define MACRO0(v) { \
real tmp; \
out2[9+(v)] = (tmp = sum0 + sum1) * w[27+(v)]; \
out2[8-(v)] = tmp * w[26-(v)]; } \
sum0 -= sum1; \
ts[SBLIMIT*(8-(v))] = out1[8-(v)] + sum0 * w[8-(v)]; \
ts[SBLIMIT*(9+(v))] = out1[9+(v)] + sum0 * w[9+(v)];
#define MACRO1(v) { \
real sum0,sum1; \
sum0 = tmp1a + tmp2a; \
sum1 = (tmp1b + tmp2b) * tfcos36[(v)]; \
MACRO0(v); }
#define MACRO2(v) { \
real sum0,sum1; \
sum0 = tmp2a - tmp1a; \
sum1 = (tmp2b - tmp1b) * tfcos36[(v)]; \
MACRO0(v); }

register const real *c = COS9;
register real *out2 = o2;
register real *w = wintab;
register real *out1 = o1;
register real *ts = tsbuf;

real ta33,ta66,tb33,tb66;

ta33 = in[2*3+0] * c[3];
ta66 = in[2*6+0] * c[6];
tb33 = in[2*3+1] * c[3];
tb66 = in[2*6+1] * c[6];

{
real tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a = in[2*1+0] * c[1] + ta33 + in[2*5+0] * c[5] + in[2*7+0] * c[7];
tmp1b = in[2*1+1] * c[1] + tb33 + in[2*5+1] * c[5] + in[2*7+1] * c[7];
tmp2a = in[2*0+0] + in[2*2+0] * c[2] + in[2*4+0] * c[4] + ta66 + in[2*8+0] * c[8];
tmp2b = in[2*0+1] + in[2*2+1] * c[2] + in[2*4+1] * c[4] + tb66 + in[2*8+1] * c[8];

MACRO1(0);
MACRO2(8);
}

{
real tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a = ( in[2*1+0] - in[2*5+0] - in[2*7+0] ) * c[3];
tmp1b = ( in[2*1+1] - in[2*5+1] - in[2*7+1] ) * c[3];
tmp2a = ( in[2*2+0] - in[2*4+0] - in[2*8+0] ) * c[6] - in[2*6+0] + in[2*0+0];
tmp2b = ( in[2*2+1] - in[2*4+1] - in[2*8+1] ) * c[6] - in[2*6+1] + in[2*0+1];

MACRO1(1);
MACRO2(7);
}

{
real tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a = in[2*1+0] * c[5] - ta33 - in[2*5+0] * c[7] + in[2*7+0] * c[1];
tmp1b = in[2*1+1] * c[5] - tb33 - in[2*5+1] * c[7] + in[2*7+1] * c[1];
tmp2a = in[2*0+0] - in[2*2+0] * c[8] - in[2*4+0] * c[2] + ta66 + in[2*8+0] * c[4];
tmp2b = in[2*0+1] - in[2*2+1] * c[8] - in[2*4+1] * c[2] + tb66 + in[2*8+1] * c[4];

MACRO1(2);
MACRO2(6);
}

{
real tmp1a,tmp2a,tmp1b,tmp2b;
tmp1a = in[2*1+0] * c[7] - ta33 + in[2*5+0] * c[1] - in[2*7+0] * c[5];
tmp1b = in[2*1+1] * c[7] - tb33 + in[2*5+1] * c[1] - in[2*7+1] * c[5];
tmp2a = in[2*0+0] - in[2*2+0] * c[4] + in[2*4+0] * c[8] + ta66 - in[2*8+0] * c[2];
tmp2b = in[2*0+1] - in[2*2+1] * c[4] + in[2*4+1] * c[8] + tb66 - in[2*8+1] * c[2];

MACRO1(3);
MACRO2(5);
}

{
real sum0,sum1;
sum0 = in[2*0+0] - in[2*2+0] + in[2*4+0] - in[2*6+0] + in[2*8+0];
sum1 = (in[2*0+1] - in[2*2+1] + in[2*4+1] - in[2*6+1] + in[2*8+1] ) * tfcos36[4];
MACRO0(4);
}
}
#endif

}
}

/*
* new DCT12
*/
static void dct12(real *in,real *rawout1,real *rawout2,register real *wi,register real *ts)
{
#define DCT12_PART1 \
in5 = in[5*3]; \
in5 += (in4 = in[4*3]); \
in4 += (in3 = in[3*3]); \
in3 += (in2 = in[2*3]); \
in2 += (in1 = in[1*3]); \
in1 += (in0 = in[0*3]); \
\
in5 += in3; in3 += in1; \
\
in2 *= COS6_1; \
in3 *= COS6_1; \

#define DCT12_PART2 \
in0 += in4 * COS6_2; \
\
in4 = in0 + in2; \
in0 -= in2; \
\
in1 += in5 * COS6_2; \
\
in5 = (in1 + in3) * tfcos12[0]; \
in1 = (in1 - in3) * tfcos12[2]; \
\
in3 = in4 + in5; \
in4 -= in5; \
\
in2 = in0 + in1; \
in0 -= in1;

{
real in0,in1,in2,in3,in4,in5;
register real *out1 = rawout1;
ts[SBLIMIT*0] = out1[0]; ts[SBLIMIT*1] = out1[1]; ts[SBLIMIT*2] = out1[2];
ts[SBLIMIT*3] = out1[3]; ts[SBLIMIT*4] = out1[4]; ts[SBLIMIT*5] = out1[5];

DCT12_PART1

{
real tmp0,tmp1 = (in0 - in4);
{
real tmp2 = (in1 - in5) * tfcos12[1];
tmp0 = tmp1 + tmp2;
tmp1 -= tmp2;
}
ts[(17-1)*SBLIMIT] = out1[17-1] + tmp0 * wi[11-1];
ts[(12+1)*SBLIMIT] = out1[12+1] + tmp0 * wi[6+1];
ts[(6 +1)*SBLIMIT] = out1[6 +1] + tmp1 * wi[1];
ts[(11-1)*SBLIMIT] = out1[11-1] + tmp1 * wi[5-1];
}

DCT12_PART2

ts[(17-0)*SBLIMIT] = out1[17-0] + in2 * wi[11-0];
ts[(12+0)*SBLIMIT] = out1[12+0] + in2 * wi[6+0];
ts[(12+2)*SBLIMIT] = out1[12+2] + in3 * wi[6+2];
ts[(17-2)*SBLIMIT] = out1[17-2] + in3 * wi[11-2];

ts[(6+0)*SBLIMIT] = out1[6+0] + in0 * wi[0];
ts[(11-0)*SBLIMIT] = out1[11-0] + in0 * wi[5-0];
ts[(6+2)*SBLIMIT] = out1[6+2] + in4 * wi[2];
ts[(11-2)*SBLIMIT] = out1[11-2] + in4 * wi[5-2];
}

in++;

{
real in0,in1,in2,in3,in4,in5;
register real *out2 = rawout2;

DCT12_PART1

{
real tmp0,tmp1 = (in0 - in4);
{
real tmp2 = (in1 - in5) * tfcos12[1];
tmp0 = tmp1 + tmp2;
tmp1 -= tmp2;
}
out2[5-1] = tmp0 * wi[11-1];
out2[0+1] = tmp0 * wi[6+1];
ts[(12+1)*SBLIMIT] += tmp1 * wi[1];
ts[(17-1)*SBLIMIT] += tmp1 * wi[5-1];
}

DCT12_PART2

out2[5-0] = in2 * wi[11-0];
out2[0+0] = in2 * wi[6+0];
out2[0+2] = in3 * wi[6+2];
out2[5-2] = in3 * wi[11-2];

ts[(12+0)*SBLIMIT] += in0 * wi[0];
ts[(17-0)*SBLIMIT] += in0 * wi[5-0];
ts[(12+2)*SBLIMIT] += in4 * wi[2];
ts[(17-2)*SBLIMIT] += in4 * wi[5-2];
}

in++;

{
real in0,in1,in2,in3,in4,in5;
register real *out2 = rawout2;
out2[12]=out2[13]=out2[14]=out2[15]=out2[16]=out2[17]=0.0;

DCT12_PART1

{
real tmp0,tmp1 = (in0 - in4);
{
real tmp2 = (in1 - in5) * tfcos12[1];
tmp0 = tmp1 + tmp2;
tmp1 -= tmp2;
}
out2[11-1] = tmp0 * wi[11-1];
out2[6 +1] = tmp0 * wi[6+1];
out2[0+1] += tmp1 * wi[1];
out2[5-1] += tmp1 * wi[5-1];
}

DCT12_PART2

out2[11-0] = in2 * wi[11-0];
out2[6 +0] = in2 * wi[6+0];
out2[6 +2] = in3 * wi[6+2];
out2[11-2] = in3 * wi[11-2];

out2[0+0] += in0 * wi[0];
out2[5-0] += in0 * wi[5-0];
out2[0+2] += in4 * wi[2];
out2[5-2] += in4 * wi[5-2];
}
}

/*
* III_hybrid
*/
static void III_hybrid(real fsIn[SBLIMIT][SSLIMIT],real tsOut[SSLIMIT][SBLIMIT],
int ch,struct gr_info_s *gr_info)
{
real *tspnt = (real *) tsOut;
static real block[2][2][SBLIMIT*SSLIMIT] = { { { 0, } } };
static int blc[2]={0,0};
real *rawout1,*rawout2;
int bt;
int sb = 0;

{
int b = blc[ch];
rawout1=block[b][ch];
b=-b+1;
rawout2=block[b][ch];
blc[ch] = b;
}

if(gr_info->mixed_block_flag) {
sb = 2;
dct36(fsIn[0],rawout1,rawout2,win[0],tspnt);
dct36(fsIn[1],rawout1+18,rawout2+18,win1[0],tspnt+1);
rawout1 += 36; rawout2 += 36; tspnt += 2;
}

bt = gr_info->block_type;
if(bt == 2) {
for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
dct12(fsIn[sb],rawout1,rawout2,win[2],tspnt);
dct12(fsIn[sb+1],rawout1+18,rawout2+18,win1[2],tspnt+1);
}
}
else {
for (; sb<gr_info->maxb; sb+=2,tspnt+=2,rawout1+=36,rawout2+=36) {
dct36(fsIn[sb],rawout1,rawout2,win[bt],tspnt);
dct36(fsIn[sb+1],rawout1+18,rawout2+18,win1[bt],tspnt+1);
}
}

for(;sb<SBLIMIT;sb++,tspnt++) {
int i;
for(i=0;i<SSLIMIT;i++) {
tspnt[i*SBLIMIT] = *rawout1++;
*rawout2++ = 0.0;
}
}
}

/*
* main layer3 handler
*/
int do_layer3(struct frame *fr,int outmode,struct audio_info_struct *ai)
{
int gr, ch, ss,clip=0;
int scalefacs[39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */
struct III_sideinfo sideinfo;
int stereo = fr->stereo;
int single = fr->single;
int ms_stereo,i_stereo;
int sfreq = fr->sampling_frequency;
int stereo1,granules;

if(stereo == 1) {
stereo1 = 1;
single = 0;
}
else if(single >= 0)
stereo1 = 1;
else
stereo1 = 2;

ms_stereo = (fr->mode == MPG_MD_JOINT_STEREO) && (fr->mode_ext & 0x2);
i_stereo = (fr->mode == MPG_MD_JOINT_STEREO) && (fr->mode_ext & 0x1);

if(fr->lsf) {
granules = 1;
III_get_side_info_2(&sideinfo,stereo,ms_stereo,sfreq,single);
}
else {
granules = 2;
III_get_side_info_1(&sideinfo,stereo,ms_stereo,sfreq,single);
}

set_pointer(sideinfo.main_data_begin);

for (gr=0;gr<granules;gr++)
{
static real hybridIn[2][SBLIMIT][SSLIMIT];
static real hybridOut[2][SSLIMIT][SBLIMIT];

{
struct gr_info_s *gr_info = &(sideinfo.ch[0].gr[gr]);
long part2bits;
if(fr->lsf)
part2bits = III_get_scale_factors_2(scalefacs,gr_info,0);
else
part2bits = III_get_scale_factors_1(scalefacs,gr_info);
if(III_dequantize_sample(hybridIn[0], scalefacs,gr_info,sfreq,part2bits))
return clip;
}
if(stereo == 2) {
struct gr_info_s *gr_info = &(sideinfo.ch[1].gr[gr]);
long part2bits;
if(fr->lsf)
part2bits = III_get_scale_factors_2(scalefacs,gr_info,i_stereo);
else
part2bits = III_get_scale_factors_1(scalefacs,gr_info);
if(ms_stereo) {
if(III_dequantize_sample_ms(hybridIn,scalefacs,gr_info,sfreq,part2bits))
return clip;
}
else {
if(III_dequantize_sample(hybridIn[1],scalefacs,gr_info,sfreq,part2bits))
return clip;
}

if(i_stereo)
III_i_stereo(hybridIn,scalefacs,gr_info,sfreq,ms_stereo,fr->lsf);

if(ms_stereo || i_stereo || (single == 3) ) {
if(gr_info->maxb > sideinfo.ch[0].gr[gr].maxb)
sideinfo.ch[0].gr[gr].maxb = gr_info->maxb;
else
gr_info->maxb = sideinfo.ch[0].gr[gr].maxb;
}

switch(single) {
case 3:
{
register int i;
register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
for(i=0;i<SSLIMIT*gr_info->maxb;i++,in0++)
*in0 = (*in0 + *in1++); /* *0.5 done by pow-scale */
}
break;
case 1:
{
register int i;
register real *in0 = (real *) hybridIn[0],*in1 = (real *) hybridIn[1];
for(i=0;i<SSLIMIT*gr_info->maxb;i++)
*in0++ = *in1++;
}
break;
}
}

for(ch=0;ch<stereo1;ch++) {
struct gr_info_s *gr_info = &(sideinfo.ch[ch].gr[gr]);
III_antialias(hybridIn[ch],gr_info);
III_hybrid(hybridIn[ch], hybridOut[ch], ch,gr_info);
}

for(ss=0;ss<SSLIMIT;ss++) {
if(single >= 0) {
clip += (fr->synth_mono)(hybridOut[0][ss],pcm_sample+pcm_point);
}
else {
clip += (fr->synth)(hybridOut[0][ss],0,pcm_sample+pcm_point);
clip += (fr->synth)(hybridOut[1][ss],1,pcm_sample+pcm_point);
}
pcm_point += fr->block_size;

#ifdef VARMODESUPPORT
if (playlimit < 128) {
pcm_point -= playlimit >> 1;
playlimit = 0;
}
else
playlimit -= 128;
#endif

if(pcm_point >= audiobufsize)
audio_flush(outmode,ai);
}
}

return clip;
}

Subversion Repositories shark

(root)/shark/trunk/ports/mpg123/layer3.c @ 880 - Rev 3