RepoMirrors/mpv
1
0
Fork 0
mirror of https://github.com/mpv-player/mpv synced 2024-12-25 16:33:02 +00:00
Code Issues Releases Wiki Activity
6e855e3d40
mpv/mp3lib/layer3.c

1704 lines
45 KiB
C
Raw Normal View History

Initial revision git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2 b3059339-0415-0410-9bf9-f77b7e298cf2
2001-02-24 20:28:24 +00:00
/*
* 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
*/
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];
#define GP2MAX (256+118+4)
static real gainpow2[GP2MAX];
static real nCOS9[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[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 */
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_sample_sblimit)
{
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++)
nCOS9[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<9;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<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)|((long)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)|((long)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) | ((long)5<<12);
n_slen2[n+500] = i|(j<<3) | ((long)2<<12) | ((long)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)|((long)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)|((long)1<<12);
}
}
}
} /* init_layer3() */
/* ========================== READ FRAME DATA ========================= */
#if 1
LOCAL real Gainpow2(int i){
// if(i<0) i=0; else
// if(i>=GP2MAX) i=GP2MAX-1;
// return gainpow2[i];
return gainpow2[((i)<0)?0:( ((i)<GP2MAX)?(i):(GP2MAX-1) )];
}
#else
#define Gainpow2(i) gainpow2[((i)<0)?0:( ((i)<GP2MAX)?(i):(GP2MAX-1) )]
#endif
/*
* 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(9);
if(gr_info->big_values > 288) {
printf("\rbig_values too large! \n");
gr_info->big_values = 288;
}
gr_info->pow2gain = 256 - getbits_fast(8) + powdiff;
if(ms_stereo) gr_info->pow2gain += 2;
gr_info->scalefac_compress = getbits_fast(4);
if(get1bit()) {
/* window-switching flag==1 (block_Type!=0) */
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) {
printf("\rBlocktype == 0 and window-switching == 1 not allowed. \n");
return;
}
/* region_count/start parameters are implicit in this case. */
gr_info->region1start = 36>>1;
gr_info->region2start = 576>>1;
} else {
/* window-switching flag==0 (block_Type==0) */
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(9);
if(gr_info->big_values > 288) {
printf("\rbig_values too large! \n");
gr_info->big_values = 288;
}
gr_info->pow2gain = 256 - getbits_fast(8) + powdiff;
if(ms_stereo)
gr_info->pow2gain += 2;
gr_info->scalefac_compress = getbits(9);
if(get1bit()) {
/* window-switching flag==1 (block_Type!=0) */
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) {
printf("\rBlocktype == 0 and window-switching == 1 not allowed. \n");
return;
}
/* 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 {
/* window-switching flag==0 (block_Type==0) */
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(num0);
i = 9;
numbits -= num0; /* num0 * 17 + num1 * 18 */
}
for (;i;i--) *scf++ = getbits(num0);
for (i = 18; i; i--) *scf++ = getbits(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(num0);
for(i=10;i;i--) *scf++ = getbits(num1);
numbits = (num0 + num1) * 10 + num0;
} else {
numbits = 0;
if(!(scfsi & 0x8)) {
for (i=6;i;i--) *scf++ = getbits(num0);
numbits += num0 * 6;
} else {
scf += 6;
}
if(!(scfsi & 0x4)) {
for (i=5;i;i--) *scf++ = getbits(num0);
numbits += num0 * 5;
} else {
scf += 5;
}
if(!(scfsi & 0x2)) {
for(i=5;i;i--) *scf++ = getbits(num1);
numbits += num1 * 5;
} else {
scf += 5;
}
if(!(scfsi & 0x1)) {
for (i=5;i;i--) *scf++ = getbits(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)
{
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) {
/*
* 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 = Gainpow2(gr_info->pow2gain + ((*scf++) << shift));
step = 1;
} else {
v = Gainpow2(gr_info->full_gain[lwin] + ((*scf++) << shift));
step = 3;
}
}
{ register short *val = h->table;
while((y=*val++)<0) {
part2remain--;
if(part2remain < 0) return 0;
if (get1bit()) val-=y;
}
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 = Gainpow2(gr_info->pow2gain + ((*scf++) << shift));
step = 1;
} else {
v = Gainpow2(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;
}
} // for(;l3 && (part2remain > 0);l3--)
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;
#if 0
me = mapend[sfreq][2];
#endif
/*
* 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 = Gainpow2(gr_info->pow2gain + (((*scf++) + (*pretab++)) << shift));
cb = *m++;
}
{ register short *val = h->table;
while((y=*val++)<0) {
part2remain--;
if(part2remain < 0) return 0;
if (get1bit()) val -= y;
// if(part2remain<=0) return 0; // Arpi
}
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;
}
}
/*
* short (count1table) values
*/
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 = Gainpow2(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;
}
}
/*
* zero part
*/
for(i=(&xr[SBLIMIT][0]-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) {
printf("\rCan'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 = Gainpow2(gr_info->pow2gain + ((*scf++) << shift));
step = 1;
}
else {
v = Gainpow2(gr_info->full_gain[lwin] + ((*scf++) << shift));
step = 3;
}
}
{
register short *val = h->table;
while((y=*val++)<0) {
part2remain--;
if(part2remain < 0) return 0;
if (get1bit()) val -= y;
// if(part2remain<=0) return 0; // Arpi
}
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 = Gainpow2(gr_info->pow2gain + ((*scf++) << shift));
step = 1;
}
else {
v = Gainpow2(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[1]) + *m;
xr0pnt = ((real *) xr[0]) + *m++;
if(*m++ == 3)
step = 1;
else
step = 3;
m++; /* cb */
}
mc--;
*xrpnt = *xr0pnt;
xrpnt += step;
xr0pnt += step;
*xrpnt = *xr0pnt;
xrpnt += step;
xr0pnt += 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 {
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;
#if 0
me = mapend[sfreq][2];
#endif
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 = Gainpow2(gr_info->pow2gain + (((*scf++) + (*pretab++)) << shift));
}
{
register short *val = h->table;
while((y=*val++)<0) {
part2remain--;
if(part2remain < 0) return 0;
if (get1bit()) val -= y;
}
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 = Gainpow2(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][0]-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) {
printf("\rCan't rewind stream by %d bits! \n",(-part2remain));
// fprintf(stderr,"mpg123: Can't rewind stream by %d bits (left=%d)!\n",(-part2remain),bitsleft);
// 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;
}
//printf("sblim=%d\n",sblim);
//if(sblim<=0 || sblim>SBLIMIT) return;
/* 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++) );
}
}
}
}
#include "dct64.c"
#include "dct36.c"
#include "dct12.c"
#include "decod386.c"
/*
* 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) */
static int do_layer3(struct frame *fr,int single){
int gr, ch, ss,clip=0;
int scalefacs[2][39]; /* max 39 for short[13][3] mode, mixed: 38, long: 22 */
struct III_sideinfo sideinfo;
int stereo = fr->stereo;
int ms_stereo,i_stereo;
int sfreq = fr->sampling_frequency;
int stereo1,granules;
// if (fr->error_protection) getbits(16); /* skip crc */
if(stereo == 1) { /* stream is mono */
stereo1 = 1;
single = 0;
} else
if(single >= 0) /* stream is stereo, but force to mono */
stereo1 = 1;
else
stereo1 = 2;
if(fr->mode == MPG_MD_JOINT_STEREO) {
ms_stereo = fr->mode_ext & 0x2;
i_stereo = fr->mode_ext & 0x1;
} else
ms_stereo = i_stereo = 0;
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[0],gr_info,0);
else
part2bits = III_get_scale_factors_1(scalefacs[0],gr_info);
if(III_dequantize_sample(hybridIn[0], scalefacs[0],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[1],gr_info,i_stereo);
else
part2bits = III_get_scale_factors_1(scalefacs[1],gr_info);
if(ms_stereo) {
if(III_dequantize_sample_ms(hybridIn,scalefacs[1],gr_info,sfreq,part2bits))
return clip;
} else {
if(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_info,sfreq,part2bits))
return clip;
}
if(i_stereo)
III_i_stereo(hybridIn,scalefacs[1],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; }
}
} // if(stereo == 2)
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 {
int p1 = pcm_point;
clip += (fr->synth)(hybridOut[0][ss],0,pcm_sample,&p1);
clip += (fr->synth)(hybridOut[1][ss],1,pcm_sample,&pcm_point);
}
}
}
return clip;
}
Reference in New Issue Copy Permalink