void psycho_anal_init (double sfreq)
{
unsigned int ch, sfb, b, i, j;
/* reset the r, phi_sav "ring buffer" indices */
old = 1 - (new_ = oldest = 0);
/* clear the ratio arrays */
for (ch = 0; ch < 2; ch++)
{
for (sfb = 0; sfb < SBMAX_l; sfb++)
ratio[ch][sfb] = 0.0;
for (sfb = 0; sfb < SBMAX_s; sfb++)
for (b = 0; b < 3; b++)
ratio_s[ch][sfb][b] = 0.0;
}
/* clear preecho arrays */
for (ch = 0; ch < 2; ch++)
{
for (i = 0; i < CBANDS; i++)
{
nb_1[ch][i] = 0;
nb_2[ch][i] = 0;
}
}
/* clear blocktype information */
for (ch = 0; ch < 2; ch++)
blocktype_old[ch] = NORM_TYPE;
sync_flush = 768;
flush = 576;
syncsize = 1344; /* sync_flush + flush */
#if RING_BUFFER==1
for (ch = 0; ch < 2; ch++)
savebuf_start_idx[ch] = 0;
#endif
/* calculate HANN window coefficients */
for (i = 0; i < BLKSIZE; i++)
window[i] = (FLOAT) (0.5 * (1 - cos (2.0 * PI * (i - 0.5) / BLKSIZE)));
for (i = 0; i < BLKSIZE_s; i++)
window_s[i] = (FLOAT) (0.5 * (1 - cos (2.0 * PI * (i - 0.5) / BLKSIZE_s)));
/* reset states used in unpredictability measure */
for (ch = 0; ch < 2; ch++)
{
for (i = 0; i < 2; i++)
{
for (j = 0; j < 6; j++)
{
r[ch][i][j] = 0.0;
phi_sav[ch][i][j] = 0.0;
}
}
}
#if NEW_L3PARM_TABLES
L3para_read ((int) sfreq);
#else
L3para_read
(
(int) sfreq,
numlines_l, partition_l, minval, qthr_l, norm_l, s3_l,
partition_s, qthr_s, norm_s, SNR_s,
cbw_l, bu_l, bo_l, w1_l, w2_l,
cbw_s, bu_s, bo_s, w1_s, w2_s
);
#endif
/* Set unpredicatiblility of remaining spectral lines to 0.4 */
for (j = 206; j < HBLKSIZE; j++)
cw[j] = 0.4;
}
void L3psycho_anal( lame_global_flags *gfp,
short int *buffer[2],int gr_out ,
FLOAT8 *ms_ratio,
FLOAT8 *ms_ratio_next,
FLOAT8 *ms_ener_ratio,
III_psy_ratio masking_ratio[2][2],
III_psy_ratio masking_MS_ratio[2][2],
FLOAT8 percep_entropy[2],FLOAT8 percep_MS_entropy[2],
int blocktype_d[2])
{
/* to get a good cache performance, one has to think about
* the sequence, in which the variables are used
*/
/* The static variables "r", "phi_sav", "new", "old" and "oldest" have */
/* to be remembered for the unpredictability measure. For "r" and */
/* "phi_sav", the first index from the left is the channel select and */
/* the second index is the "age" of the data. */
static FLOAT8 minval[CBANDS],qthr_l[CBANDS];
static FLOAT8 qthr_s[CBANDS];
static FLOAT8 nb_1[4][CBANDS], nb_2[4][CBANDS];
static FLOAT8 s3_s[CBANDS + 1][CBANDS + 1];
static FLOAT8 s3_l[CBANDS + 1][CBANDS + 1];
static III_psy_xmin thm[4];
static III_psy_xmin en[4];
/* unpredictability calculation
*/
static int cw_upper_index;
static int cw_lower_index;
static FLOAT ax_sav[4][2][HBLKSIZE];
static FLOAT bx_sav[4][2][HBLKSIZE];
static FLOAT rx_sav[4][2][HBLKSIZE];
static FLOAT cw[HBLKSIZE];
/* fft and energy calculation
*/
FLOAT (*wsamp_l)[BLKSIZE];
FLOAT (*wsamp_s)[3][BLKSIZE_s];
FLOAT tot_ener[4];
static FLOAT wsamp_L[2][BLKSIZE];
static FLOAT energy[HBLKSIZE];
static FLOAT wsamp_S[2][3][BLKSIZE_s];
static FLOAT energy_s[3][HBLKSIZE_s];
/* convolution
*/
static FLOAT8 eb[CBANDS];
static FLOAT8 cb[CBANDS];
static FLOAT8 thr[CBANDS];
/* Scale Factor Bands
*/
static FLOAT8 w1_l[SBPSY_l], w2_l[SBPSY_l];
static FLOAT8 w1_s[SBPSY_s], w2_s[SBPSY_s];
static FLOAT8 mld_l[SBPSY_l],mld_s[SBPSY_s];
static int bu_l[SBPSY_l],bo_l[SBPSY_l] ;
static int bu_s[SBPSY_s],bo_s[SBPSY_s] ;
static int npart_l,npart_s;
static int npart_l_orig,npart_s_orig;
static int s3ind[CBANDS][2];
static int s3ind_s[CBANDS][2];
static int numlines_s[CBANDS] ;
static int numlines_l[CBANDS];
static int partition_l[HBLKSIZE];
/* frame analyzer
*/
#ifdef HAVEGTK
static FLOAT energy_save[4][HBLKSIZE];
static FLOAT8 pe_save[4];
static FLOAT8 ers_save[4];
#endif
/* ratios
*/
static FLOAT8 pe[4]={0,0,0,0};
static FLOAT8 ms_ratio_s_old=0,ms_ratio_l_old=0;
static FLOAT8 ms_ener_ratio_old=.25;
FLOAT8 ms_ratio_l=0,ms_ratio_s=0;
/* block type
*/
static int blocktype_old[2];
int blocktype[2],uselongblock[2];
/* usual variables like loop indices, etc..
*/
int numchn, chn;
int b, i, j, k;
int sb,sblock;
FLOAT cwlimit;
/* initialization of static variables
*/
if((gfp->frameNum==0) && (gr_out==0)){
FLOAT8 SNR_s[CBANDS];
blocktype_old[0]=STOP_TYPE;
blocktype_old[1]=STOP_TYPE;
i = gfp->out_samplerate;
switch(i){
case 32000: break;
case 44100: break;
case 48000: break;
case 16000: break;
case 22050: break;
case 24000: break;
default: fprintf(stderr,"error, invalid sampling frequency: %d Hz\n",i);
exit(-1);
}
/* reset states used in unpredictability measure */
memset (rx_sav,0, sizeof(rx_sav));
memset (ax_sav,0, sizeof(ax_sav));
memset (bx_sav,0, sizeof(bx_sav));
memset (en,0, sizeof(en));
memset (thm,0, sizeof(thm));
/* gfp->cwlimit = sfreq*j/1024.0; */
cw_lower_index=6;
if (gfp->cwlimit>0)
cwlimit=gfp->cwlimit;
else
cwlimit=8.8717;
cw_upper_index = cwlimit*1000.0*1024.0/((FLOAT8) gfp->out_samplerate);
cw_upper_index=Min(HBLKSIZE-4,cw_upper_index); /* j+3 < HBLKSIZE-1 */
cw_upper_index=Max(6,cw_upper_index);
for ( j = 0; j < HBLKSIZE; j++ )
cw[j] = 0.4;
/* setup stereo demasking thresholds */
/* formula reverse enginerred from plot in paper */
for ( sb = 0; sb < SBPSY_s; sb++ ) {
FLOAT8 mld = 1.25*(1-cos(PI*sb/SBPSY_s))-2.5;
mld_s[sb] = pow(10.0,mld);
}
for ( sb = 0; sb < SBPSY_l; sb++ ) {
FLOAT8 mld = 1.25*(1-cos(PI*sb/SBPSY_l))-2.5;
mld_l[sb] = pow(10.0,mld);
}
for (i=0;i<HBLKSIZE;i++) partition_l[i]=-1;
L3para_read( (FLOAT8) gfp->out_samplerate,numlines_l,numlines_s,partition_l,minval,qthr_l,s3_l,s3_s,
qthr_s,SNR_s,
bu_l,bo_l,w1_l,w2_l, bu_s,bo_s,w1_s,w2_s );
/* npart_l_orig = number of partition bands before convolution */
/* npart_l = number of partition bands after convolution */
npart_l_orig=0; npart_s_orig=0;
for (i=0;i<HBLKSIZE;i++)
if (partition_l[i]>npart_l_orig) npart_l_orig=partition_l[i];
npart_l_orig++;
for (i=0;numlines_s[i]>=0;i++)
;
npart_s_orig = i;
npart_l=bo_l[SBPSY_l-1]+1;
npart_s=bo_s[SBPSY_s-1]+1;
/* MPEG2 tables are screwed up
* the mapping from paritition bands to scalefactor bands will use
* more paritition bands than we have.
* So we will not compute these fictitious partition bands by reducing
* npart_l below. */
if (npart_l > npart_l_orig) {
npart_l=npart_l_orig;
bo_l[SBPSY_l-1]=npart_l-1;
w2_l[SBPSY_l-1]=1.0;
}
if (npart_s > npart_s_orig) {
npart_s=npart_s_orig;
bo_s[SBPSY_s-1]=npart_s-1;
w2_s[SBPSY_s-1]=1.0;
}
for (i=0; i<npart_l; i++) {
for (j = 0; j < npart_l_orig; j++) {
if (s3_l[i][j] != 0.0)
break;
}
s3ind[i][0] = j;
for (j = npart_l_orig - 1; j > 0; j--) {
if (s3_l[i][j] != 0.0)
break;
}
s3ind[i][1] = j;
}
for (i=0; i<npart_s; i++) {
for (j = 0; j < npart_s_orig; j++) {
if (s3_s[i][j] != 0.0)
break;
}
s3ind_s[i][0] = j;
for (j = npart_s_orig - 1; j > 0; j--) {
if (s3_s[i][j] != 0.0)
break;
}
s3ind_s[i][1] = j;
}
/*
#include "debugscalefac.c"
*/
#define AACS3
#define NEWS3XX
#ifdef AACS3
/* AAC values, results in more masking over MP3 values */
# define TMN 18
# define NMT 6
#else
/* MP3 values */
# define TMN 29
# define NMT 6
#endif
#define rpelev 2
#define rpelev2 16
/* compute norm_l, norm_s instead of relying on table data */
for ( b = 0;b < npart_l; b++ ) {
FLOAT8 norm=0;
for ( k = s3ind[b][0]; k <= s3ind[b][1]; k++ ) {
norm += s3_l[b][k];
}
for ( k = s3ind[b][0]; k <= s3ind[b][1]; k++ ) {
s3_l[b][k] *= exp(-LN_TO_LOG10 * NMT) / norm;
}
/*printf("%i norm=%f norm_l=%f \n",b,1/norm,norm_l[b]);*/
}
/* MPEG1 SNR_s data is given in db, convert to energy */
if (gfp->version == 1) {
for ( b = 0;b < npart_s; b++ ) {
SNR_s[b]=exp( (FLOAT8) SNR_s[b] * LN_TO_LOG10 );
}
}
for ( b = 0;b < npart_s; b++ ) {
FLOAT8 norm=0;
for ( k = s3ind_s[b][0]; k <= s3ind_s[b][1]; k++ ) {
norm += s3_s[b][k];
}
for ( k = s3ind_s[b][0]; k <= s3ind_s[b][1]; k++ ) {
s3_s[b][k] *= SNR_s[b] / norm;
}
/*printf("%i norm=%f norm_s=%f \n",b,1/norm,norm_l[b]);*/
}
init_fft();
}
/************************* End of Initialization *****************************/
numchn = gfp->stereo;
/* chn=2 and 3 = Mid and Side channels */
if (gfp->mode == MPG_MD_JOINT_STEREO) numchn=4;
for (chn=0; chn<numchn; chn++) {
wsamp_s = wsamp_S+(chn & 1);
wsamp_l = wsamp_L+(chn & 1);
if (chn<2) {
/**********************************************************************
* compute FFTs
**********************************************************************/
fft_long ( *wsamp_l, chn, buffer);
fft_short( *wsamp_s, chn, buffer);
/* LR maskings */
percep_entropy[chn] = pe[chn];
masking_ratio[gr_out][chn].thm = thm[chn];
masking_ratio[gr_out][chn].en = en[chn];
}else{
/* MS maskings */
percep_MS_entropy[chn-2] = pe[chn];
masking_MS_ratio[gr_out][chn-2].en = en[chn];
masking_MS_ratio[gr_out][chn-2].thm = thm[chn];
if (chn == 2)
{
for (j = BLKSIZE-1; j >=0 ; --j)
{
FLOAT l = wsamp_L[0][j];
FLOAT r = wsamp_L[1][j];
wsamp_L[0][j] = (l+r)*(FLOAT)(SQRT2*0.5);
wsamp_L[1][j] = (l-r)*(FLOAT)(SQRT2*0.5);
}
for (b = 2; b >= 0; --b)
{
for (j = BLKSIZE_s-1; j >= 0 ; --j)
{
FLOAT l = wsamp_S[0][b][j];
FLOAT r = wsamp_S[1][b][j];
wsamp_S[0][b][j] = (l+r)*(FLOAT)(SQRT2*0.5);
wsamp_S[1][b][j] = (l-r)*(FLOAT)(SQRT2*0.5);
}
}
}
}
/**********************************************************************
* compute energies
**********************************************************************/
energy[0] = (*wsamp_l)[0];
energy[0] *= energy[0];
tot_ener[chn] = energy[0]; /* sum total energy at nearly no extra cost */
for (j=BLKSIZE/2-1; j >= 0; --j)
{
FLOAT re = (*wsamp_l)[BLKSIZE/2-j];
FLOAT im = (*wsamp_l)[BLKSIZE/2+j];
energy[BLKSIZE/2-j] = (re * re + im * im) * (FLOAT)0.5;
tot_ener[chn] += energy[BLKSIZE/2-j];
}
for (b = 2; b >= 0; --b)
{
energy_s[b][0] = (*wsamp_s)[b][0];
energy_s[b][0] *= energy_s [b][0];
for (j=BLKSIZE_s/2-1; j >= 0; --j)
{
FLOAT re = (*wsamp_s)[b][BLKSIZE_s/2-j];
FLOAT im = (*wsamp_s)[b][BLKSIZE_s/2+j];
energy_s[b][BLKSIZE_s/2-j] = (re * re + im * im) * (FLOAT)0.5;
}
}
#ifdef HAVEGTK
if(gfp->gtkflag) {
for (j=0; j<HBLKSIZE ; j++) {
pinfo->energy[gr_out][chn][j]=energy_save[chn][j];
energy_save[chn][j]=energy[j];
}
}
#endif
/**********************************************************************
* compute unpredicatability of first six spectral lines *
**********************************************************************/
for ( j = 0; j < cw_lower_index; j++ )
{ /* calculate unpredictability measure cw */
FLOAT an, a1, a2;
FLOAT bn, b1, b2;
FLOAT rn, r1, r2;
FLOAT numre, numim, den;
a2 = ax_sav[chn][1][j];
b2 = bx_sav[chn][1][j];
r2 = rx_sav[chn][1][j];
a1 = ax_sav[chn][1][j] = ax_sav[chn][0][j];
b1 = bx_sav[chn][1][j] = bx_sav[chn][0][j];
r1 = rx_sav[chn][1][j] = rx_sav[chn][0][j];
an = ax_sav[chn][0][j] = (*wsamp_l)[j];
bn = bx_sav[chn][0][j] = j==0 ? (*wsamp_l)[0] : (*wsamp_l)[BLKSIZE-j];
rn = rx_sav[chn][0][j] = sqrt(energy[j]);
{ /* square (x1,y1) */
if( r1 != 0 ) {
numre = (a1*b1);
numim = (a1*a1-b1*b1)*(FLOAT)0.5;
den = r1*r1;
} else {
numre = 1;
numim = 0;
den = 1;
}
}
{ /* multiply by (x2,-y2) */
if( r2 != 0 ) {
FLOAT tmp2 = (numim+numre)*(a2+b2)*(FLOAT)0.5;
FLOAT tmp1 = -a2*numre+tmp2;
numre = -b2*numim+tmp2;
numim = tmp1;
den *= r2;
} else {
/* do nothing */
}
}
{ /* r-prime factor */
FLOAT tmp = (2*r1-r2)/den;
numre *= tmp;
numim *= tmp;
}
den=rn+fabs(2*r1-r2);
if( den != 0 ) {
numre = (an+bn)*(FLOAT)0.5-numre;
numim = (an-bn)*(FLOAT)0.5-numim;
den = sqrt(numre*numre+numim*numim)/den;
}
cw[j] = den;
}
/**********************************************************************
* compute unpredicatibility of next 200 spectral lines *
**********************************************************************/
for ( j = cw_lower_index; j < cw_upper_index; j += 4 )
{/* calculate unpredictability measure cw */
FLOAT rn, r1, r2;
FLOAT numre, numim, den;
k = (j+2) / 4;
{ /* square (x1,y1) */
r1 = energy_s[0][k];
if( r1 != 0 ) {
FLOAT a1 = (*wsamp_s)[0][k];
FLOAT b1 = (*wsamp_s)[0][BLKSIZE_s-k]; /* k is never 0 */
numre = (a1*b1);
numim = (a1*a1-b1*b1)*(FLOAT)0.5;
den = r1;
r1 = sqrt(r1);
} else {
numre = 1;
numim = 0;
den = 1;
}
}
{ /* multiply by (x2,-y2) */
r2 = energy_s[2][k];
if( r2 != 0 ) {
FLOAT a2 = (*wsamp_s)[2][k];
FLOAT b2 = (*wsamp_s)[2][BLKSIZE_s-k];
FLOAT tmp2 = (numim+numre)*(a2+b2)*(FLOAT)0.5;
FLOAT tmp1 = -a2*numre+tmp2;
numre = -b2*numim+tmp2;
numim = tmp1;
r2 = sqrt(r2);
den *= r2;
} else {
/* do nothing */
}
}
{ /* r-prime factor */
FLOAT tmp = (2*r1-r2)/den;
numre *= tmp;
numim *= tmp;
}
rn = sqrt(energy_s[1][k]);
den=rn+fabs(2*r1-r2);
if( den != 0 ) {
FLOAT an = (*wsamp_s)[1][k];
FLOAT bn = (*wsamp_s)[1][BLKSIZE_s-k];
numre = (an+bn)*(FLOAT)0.5-numre;
numim = (an-bn)*(FLOAT)0.5-numim;
den = sqrt(numre*numre+numim*numim)/den;
}
cw[j+1] = cw[j+2] = cw[j+3] = cw[j] = den;
}
#if 0
for ( j = 14; j < HBLKSIZE-4; j += 4 )
{/* calculate energy from short ffts */
FLOAT8 tot,ave;
k = (j+2) / 4;
for (tot=0, sblock=0; sblock < 3; sblock++)
tot+=energy_s[sblock][k];
ave = energy[j+1]+ energy[j+2]+ energy[j+3]+ energy[j];
ave /= 4.;
/*
printf("energy / tot %i %5.2f %e %e\n",j,ave/(tot*16./3.),
ave,tot*16./3.);
*/
energy[j+1] = energy[j+2] = energy[j+3] = energy[j]=tot;
}
#endif
/**********************************************************************
* Calculate the energy and the unpredictability in the threshold *
* calculation partitions *
**********************************************************************/
#if 0
for ( b = 0; b < CBANDS; b++ )
{
eb[b] = 0;
cb[b] = 0;
}
for ( j = 0; j < HBLKSIZE; j++ )
{
int tp = partition_l[j];
if ( tp >= 0 )
{
eb[tp] += energy[j];
cb[tp] += cw[j] * energy[j];
}
assert(tp<npart_l_orig);
}
#else
b = 0;
for (j = 0; j < cw_upper_index;)
{
FLOAT8 ebb, cbb;
int i;
ebb = energy[j];
cbb = energy[j] * cw[j];
j++;
for (i = numlines_l[b] - 1; i > 0; i--)
{
ebb += energy[j];
cbb += energy[j] * cw[j];
j++;
}
eb[b] = ebb;
cb[b] = cbb;
b++;
}
for (; b < npart_l_orig; b++ )
{
int i;
FLOAT8 ebb = energy[j++];
for (i = numlines_l[b] - 1; i > 0; i--)
{
ebb += energy[j++];
}
eb[b] = ebb;
cb[b] = ebb * 0.4;
}
#endif
/**********************************************************************
* convolve the partitioned energy and unpredictability *
* with the spreading function, s3_l[b][k] *
******************************************************************** */
pe[chn] = 0; /* calculate percetual entropy */
for ( b = 0;b < npart_l; b++ )
{
FLOAT8 tbb,ecb,ctb;
FLOAT8 temp_1; /* BUG of IS */
ecb = 0;
ctb = 0;
for ( k = s3ind[b][0]; k <= s3ind[b][1]; k++ )
{
ecb += s3_l[b][k] * eb[k]; /* sprdngf for Layer III */
ctb += s3_l[b][k] * cb[k];
}
/* calculate the tonality of each threshold calculation partition */
/* calculate the SNR in each threshhold calculation partition */
tbb = ecb;
if (tbb != 0)
{
tbb = ctb / tbb;
if (tbb <= 0.04875584301)
{
tbb = exp(-LN_TO_LOG10 * (TMN - NMT));
}
else if (tbb > 0.4989003827)
{
tbb = 1;
}
else
{
tbb = log(tbb);
tbb = exp(((TMN - NMT)*(LN_TO_LOG10*0.299))
+ ((TMN - NMT)*(LN_TO_LOG10*0.43 ))*tbb); /* conv1=-0.299, conv2=-0.43 */
}
}
tbb = Min(minval[b], tbb);
ecb *= tbb;
/* pre-echo control */
/* rpelev=2.0, rpelev2=16.0 */
temp_1 = Min(ecb, Min(rpelev*nb_1[chn][b],rpelev2*nb_2[chn][b]) );
thr[b] = Max( qthr_l[b], temp_1 );
nb_2[chn][b] = nb_1[chn][b];
nb_1[chn][b] = ecb;
/* note: all surges in PE are because of the above pre-echo formula
* for temp_1. it this is not used, PE is always around 600
*/
if (thr[b] < eb[b])
{
/* there's no non sound portition, because thr[b] is
maximum of qthr_l and temp_1 */
pe[chn] -= numlines_l[b] * log(thr[b] / eb[b]);
}
}
#ifdef HAVEGTK
if (gfp->gtkflag) {
FLOAT mn,mx,ma=0,mb=0,mc=0;
for ( j = HBLKSIZE_s/2; j < HBLKSIZE_s; j ++)
{
ma += energy_s[0][j];
mb += energy_s[1][j];
mc += energy_s[2][j];
}
mn = Min(ma,mb);
mn = Min(mn,mc);
mx = Max(ma,mb);
mx = Max(mx,mc);
pinfo->ers[gr_out][chn]=ers_save[chn];
ers_save[chn]=mx/(1e-12+mn);
pinfo->pe[gr_out][chn]=pe_save[chn];
pe_save[chn]=pe[chn];
}
#endif
/***************************************************************
* determine the block type (window type) based on L & R channels
*
***************************************************************/
if (chn<2) {
if (gfp->no_short_blocks){
uselongblock[chn]=1;
} else {
/* tuned for t1.wav. doesnt effect most other samples */
if (pe[chn] > 3000) {
uselongblock[chn]=0;
} else {
FLOAT mn,mx,ma=0,mb=0,mc=0;
for ( j = HBLKSIZE_s/2; j < HBLKSIZE_s; j ++)
{
ma += energy_s[0][j];
mb += energy_s[1][j];
mc += energy_s[2][j];
}
mn = Min(ma,mb);
mn = Min(mn,mc);
mx = Max(ma,mb);
mx = Max(mx,mc);
uselongblock[chn] = 1;
if ( mx > 30*mn )
{/* big surge of energy - always use short blocks */
uselongblock[chn] = 0;
}
else if ((mx > 10*mn) && (pe[chn] > 1000))
{/* medium surge, medium pe - use short blocks */
uselongblock[chn] = 0;
}
}
}
}
/***************************************************************
* compute masking thresholds for both short and long blocks
***************************************************************/
/* longblock threshold calculation (part 2) */
for ( sb = 0; sb < SBPSY_l; sb++ )
{
FLOAT8 enn = w1_l[sb] * eb[bu_l[sb]] + w2_l[sb] * eb[bo_l[sb]];
FLOAT8 thmm = w1_l[sb] *thr[bu_l[sb]] + w2_l[sb] * thr[bo_l[sb]];
for ( b = bu_l[sb]+1; b < bo_l[sb]; b++ )
{
enn += eb[b];
thmm += thr[b];
}
en[chn].l[sb] = enn;
thm[chn].l[sb] = thmm;
}
/* threshold calculation for short blocks */
for ( sblock = 0; sblock < 3; sblock++ )
{
j = 0;
for ( b = 0; b < npart_s_orig; b++ )
{
int i;
FLOAT ecb = energy_s[sblock][j++];
for (i = numlines_s[b]; i > 0; i--)
{
ecb += energy_s[sblock][j++];
}
eb[b] = ecb;
}
for ( b = 0; b < npart_s; b++ )
{
FLOAT8 ecb = 0;
for ( k = s3ind_s[b][0]; k <= s3ind_s[b][1]; k++ )
{
ecb += s3_s[b][k] * eb[k];
}
thr[b] = Max (qthr_s[b], ecb);
}
for ( sb = 0; sb < SBPSY_s; sb++ )
{
FLOAT8 enn = w1_s[sb] * eb[bu_s[sb]] + w2_s[sb] * eb[bo_s[sb]];
FLOAT8 thmm = w1_s[sb] *thr[bu_s[sb]] + w2_s[sb] * thr[bo_s[sb]];
for ( b = bu_s[sb]+1; b < bo_s[sb]; b++ )
{
enn += eb[b];
thmm += thr[b];
}
en[chn].s[sb][sblock] = enn;
thm[chn].s[sb][sblock] = thmm;
}
}
} /* end loop over chn */
/* compute M/S thresholds from Johnston & Ferreira 1992 ICASSP paper */
if ( numchn==4 /* mid/side and r/l */) {
FLOAT8 rside,rmid,mld;
int chmid=2,chside=3;
for ( sb = 0; sb < SBPSY_l; sb++ ) {
/* use this fix if L & R masking differs by 2db or less */
/* if db = 10*log10(x2/x1) < 2 */
/* if (x2 < 1.58*x1) { */
if (thm[0].l[sb] <= 1.58*thm[1].l[sb]
&& thm[1].l[sb] <= 1.58*thm[0].l[sb]) {
mld = mld_l[sb]*en[chside].l[sb];
rmid = Max(thm[chmid].l[sb], Min(thm[chside].l[sb],mld));
mld = mld_l[sb]*en[chmid].l[sb];
rside = Max(thm[chside].l[sb],Min(thm[chmid].l[sb],mld));
thm[chmid].l[sb]=rmid;
thm[chside].l[sb]=rside;
}
}
for ( sb = 0; sb < SBPSY_s; sb++ ) {
for ( sblock = 0; sblock < 3; sblock++ ) {
if (thm[0].s[sb][sblock] <= 1.58*thm[1].s[sb][sblock]
&& thm[1].s[sb][sblock] <= 1.58*thm[0].s[sb][sblock]) {
mld = mld_s[sb]*en[chside].s[sb][sblock];
rmid = Max(thm[chmid].s[sb][sblock],Min(thm[chside].s[sb][sblock],mld));
mld = mld_s[sb]*en[chmid].s[sb][sblock];
rside = Max(thm[chside].s[sb][sblock],Min(thm[chmid].s[sb][sblock],mld));
thm[chmid].s[sb][sblock]=rmid;
thm[chside].s[sb][sblock]=rside;
}
}
}
}
if (gfp->mode == MPG_MD_JOINT_STEREO) {
/* determin ms_ratio from masking thresholds*/
/* use ms_stereo (ms_ratio < .35) if average thresh. diff < 5 db */
FLOAT8 db,x1,x2,sidetot=0,tot=0;
for (sb= SBPSY_l/4 ; sb< SBPSY_l; sb ++ ) {
x1 = Min(thm[0].l[sb],thm[1].l[sb]);
x2 = Max(thm[0].l[sb],thm[1].l[sb]);
/* thresholds difference in db */
if (x2 >= 1000*x1) db=3;
else db = log10(x2/x1);
/* printf("db = %f %e %e \n",db,thm[0].l[sb],thm[1].l[sb]);*/
sidetot += db;
tot++;
}
ms_ratio_l= (sidetot/tot)*0.7; /* was .35*(sidetot/tot)/5.0*10 */
ms_ratio_l = Min(ms_ratio_l,0.5);
sidetot=0; tot=0;
for ( sblock = 0; sblock < 3; sblock++ )
for ( sb = SBPSY_s/4; sb < SBPSY_s; sb++ ) {
x1 = Min(thm[0].s[sb][sblock],thm[1].s[sb][sblock]);
x2 = Max(thm[0].s[sb][sblock],thm[1].s[sb][sblock]);
/* thresholds difference in db */
if (x2 >= 1000*x1) db=3;
else db = log10(x2/x1);
sidetot += db;
tot++;
}
ms_ratio_s = (sidetot/tot)*0.7; /* was .35*(sidetot/tot)/5.0*10 */
ms_ratio_s = Min(ms_ratio_s,.5);
}
/***************************************************************
* determin final block type
***************************************************************/
for (chn=0; chn<gfp->stereo; chn++) {
blocktype[chn] = NORM_TYPE;
}
if (gfp->stereo==2) {
if (!gfp->allow_diff_short || gfp->mode==MPG_MD_JOINT_STEREO) {
/* force both channels to use the same block type */
/* this is necessary if the frame is to be encoded in ms_stereo. */
/* But even without ms_stereo, FhG does this */
int bothlong= (uselongblock[0] && uselongblock[1]);
if (!bothlong) {
uselongblock[0]=0;
uselongblock[1]=0;
}
}
}
/* update the blocktype of the previous granule, since it depends on what
* happend in this granule */
for (chn=0; chn<gfp->stereo; chn++) {
if ( uselongblock[chn])
{ /* no attack : use long blocks */
switch( blocktype_old[chn] )
{
case NORM_TYPE:
case STOP_TYPE:
blocktype[chn] = NORM_TYPE;
break;
case SHORT_TYPE:
blocktype[chn] = STOP_TYPE;
break;
case START_TYPE:
fprintf( stderr, "Error in block selecting\n" );
abort();
break; /* problem */
}
} else {
/* attack : use short blocks */
blocktype[chn] = SHORT_TYPE;
if ( blocktype_old[chn] == NORM_TYPE ) {
blocktype_old[chn] = START_TYPE;
}
if ( blocktype_old[chn] == STOP_TYPE ) {
blocktype_old[chn] = SHORT_TYPE ;
}
}
blocktype_d[chn] = blocktype_old[chn]; /* value returned to calling program */
blocktype_old[chn] = blocktype[chn]; /* save for next call to l3psy_anal */
}
if (blocktype_d[0]==2)
*ms_ratio = ms_ratio_s_old;
else
*ms_ratio = ms_ratio_l_old;
ms_ratio_s_old = ms_ratio_s;
ms_ratio_l_old = ms_ratio_l;
/* we dont know the block type of this frame yet - assume long */
*ms_ratio_next = ms_ratio_l;
/*********************************************************************/
/* compute side_energy / (side+mid)_energy */
/* 0 = no energy in side channel */
/* .5 = half of total energy in side channel */
/*********************************************************************/
if (numchn==4) {
FLOAT tmp = tot_ener[3]+tot_ener[2];
*ms_ener_ratio = ms_ener_ratio_old;
ms_ener_ratio_old=0;
if (tmp>0) ms_ener_ratio_old=tot_ener[3]/tmp;
} else
/* we didn't compute ms_ener_ratios */
*ms_ener_ratio = 0;
}
