mpv/mp3lib/layer3.c

1350 lines
36 KiB
C

/*
* Modified for use with MPlayer, for details see the CVS changelog at
* http://www.mplayerhq.hu/cgi-bin/cvsweb.cgi/main/
* $Id$
*/
/*
* Mpeg Layer-3 audio decoder
* --------------------------
* copyright (c) 1995-1999 by Michael Hipp.
* All rights reserved. See also 'README'
*
* Optimize-TODO: put short bands into the band-field without the stride
* of 3 reals
* Length-optimze: unify long and short band code where it is possible
*/
#if 0
#define L3_DEBUG 1
#endif
#if 0
#define CUT_HF
#endif
# define REAL_MUL(x, y) ((x) * (y))
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];
/* non static for external 3dnow functions */
real COS9[9];
static real COS6_1,COS6_2;
real tfcos36[9];
static real tfcos12[3];
#define NEW_DCT9
#ifdef NEW_DCT9
static real cos9[3],cos18[3];
#endif
struct bandInfoStruct {
int longIdx[23];
int longDiff[22];
int shortIdx[14];
int shortDiff[13];
};
static int longLimit[9][23];
static int shortLimit[9][14];
static 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 } } ,
/* changed 19th value fropm 330 to 332 */
{ {0,6,12,18,24,30,36,44,54,66,80,96,114,136,162,194,232,278,332,394,464,540,576},
{6,6,6,6,6,6,8,10,12,14,16,18,22,26,32,38,46,54,62,70,76,36 } ,
{0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,136*3,180*3,192*3} ,
{4,4,4,6,8,10,12,14,18,24,32,44,12 } } ,
{ {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576},
{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54 },
{0,4*3,8*3,12*3,18*3,26*3,36*3,48*3,62*3,80*3,104*3,134*3,174*3,192*3},
{4,4,4,6,8,10,12,14,18,24,30,40,18 } } ,
/* MPEG 2.5 */
{ {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
{0,12,24,36,54,78,108,144,186,240,312,402,522,576},
{4,4,4,6,8,10,12,14,18,24,30,40,18} },
{ {0,6,12,18,24,30,36,44,54,66,80,96,116,140,168,200,238,284,336,396,464,522,576} ,
{6,6,6,6,6,6,8,10,12,14,16,20,24,28,32,38,46,52,60,68,58,54},
{0,12,24,36,54,78,108,144,186,240,312,402,522,576},
{4,4,4,6,8,10,12,14,18,24,30,40,18} },
{ {0,12,24,36,48,60,72,88,108,132,160,192,232,280,336,400,476,566,568,570,572,574,576},
{12,12,12,12,12,12,16,20,24,28,32,40,48,56,64,76,90,2,2,2,2,2},
{0, 24, 48, 72,108,156,216,288,372,480,486,492,498,576},
{8,8,8,12,16,20,24,28,36,2,2,2,26} } ,
};
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
*/
static void init_layer3(int down_sample_sblimit)
{
int i,j,k,l;
for(i=-256;i<118+4;i++)
{
if(_has_mmx)
gainpow2[i+256] = 16384.0 * pow((double)2.0,-0.25 * (double) (i+210) );
else
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<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)|(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 (for MPEG 1 and MPEG 2)
*/
static int III_get_side_info(struct III_sideinfo *si,int stereo,
int ms_stereo,long sfreq,int single,int lsf)
{
int ch, gr;
int powdiff = (single == 3) ? 4 : 0;
static const int tabs[2][5] = { { 2,9,5,3,4 } , { 1,8,1,2,9 } };
const int *tab = tabs[lsf];
si->main_data_begin = getbits(tab[1]);
if (stereo == 1)
si->private_bits = getbits_fast(tab[2]);
else
si->private_bits = getbits_fast(tab[3]);
if(!lsf) {
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<tab[0]; 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) {
fprintf(stderr,"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(tab[4]);
if(get1bit()) { /* window switch flag */
int i;
#ifdef L3_DEBUG
if(2*gr_info->big_values > bandInfo[sfreq].shortIdx[12])
fprintf(stderr,"L3: BigValues too large, doesn't make sense %d %d\n",2*gr_info->big_values,bandInfo[sfreq].shortIdx[12]);
#endif
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");
return 0;
}
/* region_count/start parameters are implicit in this case. */
if(!lsf || gr_info->block_type == 2)
gr_info->region1start = 36>>1;
else {
/* check this again for 2.5 and sfreq=8 */
if(sfreq == 8)
gr_info->region1start = 108>>1;
else
gr_info->region1start = 54>>1;
}
gr_info->region2start = 576>>1;
}
else {
int i,r0c,r1c;
#ifdef L3_DEBUG
if(2*gr_info->big_values > bandInfo[sfreq].longIdx[21])
fprintf(stderr,"L3: BigValues too large, doesn't make sense %d %d\n",2*gr_info->big_values,bandInfo[sfreq].longIdx[21]);
#endif
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 ;
if(r0c + r1c + 2 > 22)
gr_info->region2start = 576>>1;
else
gr_info->region2start = bandInfo[sfreq].longIdx[r0c+1+r1c+1] >> 1;
gr_info->block_type = 0;
gr_info->mixed_block_flag = 0;
}
if(!lsf)
gr_info->preflag = get1bit();
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};
#define getbitoffset() ((-bitindex)&0x7)
#define getbyte() (*wordpointer++)
/*
* Dequantize samples (includes huffman decoding)
*/
/* 24 is enough because tab13 has max. a 19 bit huffvector */
#define BITSHIFT ((sizeof(long)-1)*8)
#define REFRESH_MASK \
while(num < BITSHIFT) { \
mask |= ((unsigned long)getbyte())<<(BITSHIFT-num); \
num += 8; \
part2remain -= 8; }
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 num=getbitoffset();
long mask;
/* we must split this, because for num==0 the shift is undefined if you do it in one step */
mask = ((unsigned long) getbits(num))<<BITSHIFT;
mask <<= 8-num;
part2remain -= num;
{
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] = 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=3,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;
REFRESH_MASK;
while((y=*val++)<0) {
if (mask < 0)
val -= y;
num--;
mask <<= 1;
}
x = y >> 4;
y &= 0xf;
}
if(x == 15 && h->linbits) {
max[lwin] = cb;
REFRESH_MASK;
x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
num -= h->linbits+1;
mask <<= h->linbits;
if(mask < 0)
*xrpnt = REAL_MUL(-ispow[x], v);
else
*xrpnt = REAL_MUL(ispow[x], v);
mask <<= 1;
}
else if(x) {
max[lwin] = cb;
if(mask < 0)
*xrpnt = REAL_MUL(-ispow[x], v);
else
*xrpnt = REAL_MUL(ispow[x], v);
num--;
mask <<= 1;
}
else
*xrpnt = 0.0;
xrpnt += step;
if(y == 15 && h->linbits) {
max[lwin] = cb;
REFRESH_MASK;
y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
num -= h->linbits+1;
mask <<= h->linbits;
if(mask < 0)
*xrpnt = REAL_MUL(-ispow[y], v);
else
*xrpnt = REAL_MUL(ispow[y], v);
mask <<= 1;
}
else if(y) {
max[lwin] = cb;
if(mask < 0)
*xrpnt = REAL_MUL(-ispow[y], v);
else
*xrpnt = REAL_MUL(ispow[y], v);
num--;
mask <<= 1;
}
else
*xrpnt = 0.0;
xrpnt += step;
}
}
for(;l3 && (part2remain+num > 0);l3--) {
struct newhuff *h = htc+gr_info->count1table_select;
register short *val = h->table,a;
REFRESH_MASK;
while((a=*val++)<0) {
if (mask < 0)
val -= a;
num--;
mask <<= 1;
}
if(part2remain+num <= 0) {
num -= part2remain+num;
break;
}
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;
if(part2remain+num <= 0) {
break;
}
if(mask < 0)
*xrpnt = -v;
else
*xrpnt = v;
num--;
mask <<= 1;
}
else
*xrpnt = 0.0;
xrpnt += step;
}
}
if(lwin < 3) { /* short band? */
while(1) {
for(;mc > 0;mc--) {
*xrpnt = 0.0; xrpnt += 3; /* short band -> step=3 */
*xrpnt = 0.0; xrpnt += 3;
}
if(m >= me)
break;
mc = *m++;
xrpnt = ((real *) xr) + *m++;
if(*m++ == 0)
break; /* optimize: field will be set to zero at the end of the function */
m++; /* cb */
}
}
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;
int *m = map[sfreq][2];
register real v = 0.0;
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++;
cb = *m++;
#ifdef CUT_HF
if(cb == 21) {
fprintf(stderr,"c");
v = 0.0;
}
else
#endif
v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
}
{
register short *val = h->table;
REFRESH_MASK;
while((y=*val++)<0) {
if (mask < 0)
val -= y;
num--;
mask <<= 1;
}
x = y >> 4;
y &= 0xf;
}
if (x == 15 && h->linbits) {
max = cb;
REFRESH_MASK;
x += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
num -= h->linbits+1;
mask <<= h->linbits;
if(mask < 0)
*xrpnt++ = REAL_MUL(-ispow[x], v);
else
*xrpnt++ = REAL_MUL(ispow[x], v);
mask <<= 1;
}
else if(x) {
max = cb;
if(mask < 0)
*xrpnt++ = REAL_MUL(-ispow[x], v);
else
*xrpnt++ = REAL_MUL(ispow[x], v);
num--;
mask <<= 1;
}
else
*xrpnt++ = 0.0;
if (y == 15 && h->linbits) {
max = cb;
REFRESH_MASK;
y += ((unsigned long) mask) >> (BITSHIFT+8-h->linbits);
num -= h->linbits+1;
mask <<= h->linbits;
if(mask < 0)
*xrpnt++ = REAL_MUL(-ispow[y], v);
else
*xrpnt++ = REAL_MUL(ispow[y], v);
mask <<= 1;
}
else if(y) {
max = cb;
if(mask < 0)
*xrpnt++ = REAL_MUL(-ispow[y], v);
else
*xrpnt++ = REAL_MUL(ispow[y], v);
num--;
mask <<= 1;
}
else
*xrpnt++ = 0.0;
}
}
/*
* short (count1table) values
*/
for(;l3 && (part2remain+num > 0);l3--) {
struct newhuff *h = htc+gr_info->count1table_select;
register short *val = h->table,a;
REFRESH_MASK;
while((a=*val++)<0) {
if (mask < 0)
val -= a;
num--;
mask <<= 1;
}
if(part2remain+num <= 0) {
num -= part2remain+num;
break;
}
for(i=0;i<4;i++) {
if(!(i & 1)) {
if(!mc) {
mc = *m++;
cb = *m++;
#ifdef CUT_HF
if(cb == 21) {
fprintf(stderr,"c");
v = 0.0;
}
else
#endif
v = gr_info->pow2gain[((*scf++) + (*pretab++)) << shift];
}
mc--;
}
if ( (a & (0x8>>i)) ) {
max = cb;
if(part2remain+num <= 0) {
break;
}
if(mask < 0)
*xrpnt++ = -v;
else
*xrpnt++ = v;
num--;
mask <<= 1;
}
else
*xrpnt++ = 0.0;
}
}
gr_info->maxbandl = max+1;
gr_info->maxb = longLimit[sfreq][gr_info->maxbandl];
}
part2remain += num;
// backbits(num);
bitindex -= num; wordpointer += (bitindex>>3); bitindex &= 0x7;
num = 0;
while(xrpnt < &xr[SBLIMIT][0])
*xrpnt++ = 0.0;
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;
}
/*
* 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];
const real *tab1,*tab2;
int tab;
static const real *tabs[3][2][2] = {
{ { tan1_1,tan2_1 } , { tan1_2,tan2_2 } },
{ { pow1_1[0],pow2_1[0] } , { pow1_2[0],pow2_2[0] } } ,
{ { pow1_1[1],pow2_1[1] } , { pow1_2[1],pow2_2[1] } }
};
tab = lsf + (gr_info->scalefac_compress & lsf);
tab1 = tabs[tab][ms_stereo][0];
tab2 = tabs[tab][ms_stereo][1];
#if 0
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;
}
}
#endif
// printf("III_i_st: tab1=%p tab2=%p tab=%d ms=%d \n", tab1, tab2, tab, ms_stereo);
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] = REAL_MUL(v, t1);
xr[1][idx] = REAL_MUL(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] = REAL_MUL(v, t1);
xr[1][idx] = REAL_MUL(v, t2);
}
}
} /* end for(lwin; .. ; . ) */
/* also check l-part, if ALL bands in the three windows are 'empty'
* and mode = mixed_mode
*/
if (do_l) {
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] = REAL_MUL(v, t1);
xr[1][idx] = REAL_MUL(v, t2);
}
}
else
idx += sb;
}
}
}
else { /* ((gr_info->block_type != 2)) */
int sfb = gr_info->maxbandl;
int is_p,idx = bi->longIdx[sfb];
/* hmm ... maybe the maxbandl stuff for i-stereo is buggy? */
if(sfb <= 21) {
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] = REAL_MUL(v, t1);
xr[1][idx] = REAL_MUL(v, t2);
}
}
else
idx += sb;
}
is_p = scalefac[20];
if(is_p != 7) { /* copy l-band 20 to l-band 21 */
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] = REAL_MUL(v, t1);
xr[1][idx] = REAL_MUL(v, t2);
}
}
} /* end: if(sfb <= 21) */
} /* ... */
}
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++) );
}
}
}
}
#include "dct64.c"
#include "dct36.c"
#include "dct12.c"
#include "decod386.c"
/*
* III_hybrid
*/
static dct36_func_t dct36_func;
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_func)(fsIn[0],rawout1,rawout2,win[0],tspnt);
(*dct36_func)(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_func)(fsIn[sb],rawout1,rawout2,win[bt],tspnt);
(*dct36_func)(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)>>1;
i_stereo = fr->mode_ext & 0x1;
} else
ms_stereo = i_stereo = 0;
if(!III_get_side_info(&sideinfo,stereo,ms_stereo,sfreq,single,fr->lsf))
return -1;
set_pointer(sideinfo.main_data_begin);
granules = (fr->lsf) ? 1 : 2;
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(III_dequantize_sample(hybridIn[1],scalefacs[1],gr_info,sfreq,part2bits))
return clip;
if(ms_stereo) {
int i;
int maxb = sideinfo.ch[0].gr[gr].maxb;
if(sideinfo.ch[1].gr[gr].maxb > maxb)
maxb = sideinfo.ch[1].gr[gr].maxb;
for(i=0;i<SSLIMIT*maxb;i++) {
real tmp0 = ((real *)hybridIn[0])[i];
real tmp1 = ((real *)hybridIn[1])[i];
((real *)hybridIn[0])[i] = tmp0 + tmp1;
((real *)hybridIn[1])[i] = tmp0 - tmp1;
}
}
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;
}