#include "int_types.h"
#include "ac3_decoder.h"
-#include "ac3_bit_allocate.h"
+#include "ac3_internal.h"
/*
-static inline s16 logadd(s16 a,s16 b);
-static s16 calc_lowcomp(s16 a,s16 b0,s16 b1,s16 bin);
-static inline u16 min(s16 a,s16 b);
-static inline u16 max(s16 a,s16 b);
+static inline s16 logadd (s16 a, s16 b);
+static s16 calc_lowcomp (s16 a, s16 b0, s16 b1, s16 bin);
+static inline u16 min (s16 a, s16 b);
+static inline u16 max (s16 a, s16 b);
*/
-static void ba_compute_psd(s16 start, s16 end, s16 exps[],
- s16 psd[], s16 bndpsd[]);
+static void ba_compute_psd (s16 start, s16 end, s16 exps[],
+ s16 psd[], s16 bndpsd[]);
-static void ba_compute_excitation(s16 start, s16 end,s16 fgain,
- s16 fastleak, s16 slowleak, s16 is_lfe, s16 bndpsd[],
- s16 excite[]);
-static void ba_compute_mask(s16 start, s16 end, u16 fscod,
- u16 deltbae, u16 deltnseg, u16 deltoffst[], u16 deltba[],
- u16 deltlen[], s16 excite[], s16 mask[]);
-static void ba_compute_bap(s16 start, s16 end, s16 snroffset,
- s16 psd[], s16 mask[], s16 bap[]);
+static void ba_compute_excitation (s16 start, s16 end, s16 fgain,
+ s16 fastleak, s16 slowleak, s16 is_lfe,
+ s16 bndpsd[], s16 excite[]);
+static void ba_compute_mask (s16 start, s16 end, u16 fscod,
+ u16 deltbae, u16 deltnseg, u16 deltoffst[],
+ u16 deltba[], u16 deltlen[], s16 excite[],
+ s16 mask[]);
+static void ba_compute_bap (s16 start, s16 end, s16 snroffset,
+ s16 psd[], s16 mask[], s16 bap[]);
/* Misc LUTs for bit allocation process */
static u16 floortab[] = { 0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800 };
static s16 fastgain[] = { 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400 };
-
static s16 bndtab[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 31,
static s16 excite[256];
static s16 mask[256];
-static __inline__ u16 max( s16 a, s16 b )
+static __inline__ u16 max (s16 a, s16 b)
{
- return( a > b ? a : b );
+ return (a > b ? a : b);
}
-static __inline__ u16 min( s16 a, s16 b )
+static __inline__ u16 min (s16 a, s16 b)
{
- return( a < b ? a : b );
+ return (a < b ? a : b);
}
-static __inline__ s16 logadd( s16 a, s16 b )
+static __inline__ s16 logadd (s16 a, s16 b)
{
s16 c;
- if ( (c = a - b) >= 0 )
- {
- return( a + latab[min(((c) >> 1), 255)] );
- }
- else
- {
- return( b + latab[min(((-c) >> 1), 255)] );
+ if ((c = a - b) >= 0) {
+ return (a + latab[min(((c) >> 1), 255)]);
+ } else {
+ return (b + latab[min(((-c) >> 1), 255)]);
}
}
-static __inline__ s16 calc_lowcomp( s16 a, s16 b0, s16 b1, s16 bin )
+static __inline__ s16 calc_lowcomp (s16 a, s16 b0, s16 b1, s16 bin)
{
- if (bin < 7)
- {
+ if (bin < 7) {
if ((b0 + 256) == b1)
a = 384;
else if (b0 > b1)
a = max(0, a - 64);
- }
- else if (bin < 20)
- {
+ } else if (bin < 20) {
if ((b0 + 256) == b1)
a = 320;
else if (b0 > b1)
a = max(0, a - 64) ;
- }
- else
+ } else
a = max(0, a - 128);
- return(a);
+ return a;
}
-void bit_allocate( ac3dec_t * p_ac3dec )
+void bit_allocate (ac3dec_t * p_ac3dec)
{
u16 i;
s16 fgain;
/* Only perform bit_allocation if the exponents have changed or we
* have new sideband information */
if (p_ac3dec->audblk.chexpstr[0] == 0 && p_ac3dec->audblk.chexpstr[1] == 0 &&
- p_ac3dec->audblk.chexpstr[2] == 0 && p_ac3dec->audblk.chexpstr[3] == 0 &&
- p_ac3dec->audblk.chexpstr[4] == 0 && p_ac3dec->audblk.cplexpstr == 0 &&
- p_ac3dec->audblk.lfeexpstr == 0 && p_ac3dec->audblk.baie == 0 &&
- p_ac3dec->audblk.snroffste == 0 && p_ac3dec->audblk.deltbaie == 0)
+ p_ac3dec->audblk.chexpstr[2] == 0 && p_ac3dec->audblk.chexpstr[3] == 0 &&
+ p_ac3dec->audblk.chexpstr[4] == 0 && p_ac3dec->audblk.cplexpstr == 0 &&
+ p_ac3dec->audblk.lfeexpstr == 0 && p_ac3dec->audblk.baie == 0 &&
+ p_ac3dec->audblk.snroffste == 0 && p_ac3dec->audblk.deltbaie == 0)
return;
/* Do some setup before we do the bit alloc */
floor = floortab[p_ac3dec->audblk.floorcod];
/* if all the SNR offset constants are zero then the whole block is zero */
- if(!p_ac3dec->audblk.csnroffst && !p_ac3dec->audblk.fsnroffst[0] &&
- !p_ac3dec->audblk.fsnroffst[1] && !p_ac3dec->audblk.fsnroffst[2] &&
- !p_ac3dec->audblk.fsnroffst[3] && !p_ac3dec->audblk.fsnroffst[4] &&
- !p_ac3dec->audblk.cplfsnroffst && !p_ac3dec->audblk.lfefsnroffst)
- {
+ if (!p_ac3dec->audblk.csnroffst && !p_ac3dec->audblk.fsnroffst[0] &&
+ !p_ac3dec->audblk.fsnroffst[1] && !p_ac3dec->audblk.fsnroffst[2] &&
+ !p_ac3dec->audblk.fsnroffst[3] && !p_ac3dec->audblk.fsnroffst[4] &&
+ !p_ac3dec->audblk.cplfsnroffst && !p_ac3dec->audblk.lfefsnroffst) {
memset(p_ac3dec->audblk.fbw_bap,0,sizeof(u16) * 256 * 5);
memset(p_ac3dec->audblk.cpl_bap,0,sizeof(u16) * 256);
memset(p_ac3dec->audblk.lfe_bap,0,sizeof(u16) * 7);
return;
}
- for(i = 0; i < p_ac3dec->bsi.nfchans; i++)
- {
+ for (i = 0; i < p_ac3dec->bsi.nfchans; i++) {
start = 0;
end = p_ac3dec->audblk.endmant[i] ;
fgain = fastgain[p_ac3dec->audblk.fgaincod[i]];
fastleak = 0;
slowleak = 0;
- ba_compute_psd(start, end, p_ac3dec->audblk.fbw_exp[i], psd, bndpsd);
+ ba_compute_psd (start, end, p_ac3dec->audblk.fbw_exp[i], psd, bndpsd);
- ba_compute_excitation(start, end , fgain, fastleak, slowleak, 0, bndpsd, excite);
+ ba_compute_excitation (start, end , fgain, fastleak, slowleak, 0,
+ bndpsd, excite);
- ba_compute_mask(start, end, p_ac3dec->syncinfo.fscod, p_ac3dec->audblk.deltbae[i], p_ac3dec->audblk.deltnseg[i], p_ac3dec->audblk.deltoffst[i], p_ac3dec->audblk.deltba[i], p_ac3dec->audblk.deltlen[i], excite, mask);
+ ba_compute_mask (start, end, p_ac3dec->syncinfo.fscod,
+ p_ac3dec->audblk.deltbae[i],
+ p_ac3dec->audblk.deltnseg[i],
+ p_ac3dec->audblk.deltoffst[i],
+ p_ac3dec->audblk.deltba[i],
+ p_ac3dec->audblk.deltlen[i], excite, mask);
- ba_compute_bap(start, end, snroffset, psd, mask, p_ac3dec->audblk.fbw_bap[i]);
+ ba_compute_bap (start, end, snroffset, psd, mask,
+ p_ac3dec->audblk.fbw_bap[i]);
}
- if(p_ac3dec->audblk.cplinu)
- {
+ if (p_ac3dec->audblk.cplinu) {
start = p_ac3dec->audblk.cplstrtmant;
end = p_ac3dec->audblk.cplendmant;
fgain = fastgain[p_ac3dec->audblk.cplfgaincod];
fastleak = (p_ac3dec->audblk.cplfleak << 8) + 768;
slowleak = (p_ac3dec->audblk.cplsleak << 8) + 768;
- ba_compute_psd(start, end, p_ac3dec->audblk.cpl_exp, psd, bndpsd);
+ ba_compute_psd (start, end, p_ac3dec->audblk.cpl_exp, psd, bndpsd);
- ba_compute_excitation(start, end , fgain, fastleak, slowleak, 0, bndpsd, excite);
+ ba_compute_excitation (start, end , fgain, fastleak, slowleak, 0,
+ bndpsd, excite);
- ba_compute_mask(start, end, p_ac3dec->syncinfo.fscod, p_ac3dec->audblk.cpldeltbae, p_ac3dec->audblk.cpldeltnseg, p_ac3dec->audblk.cpldeltoffst, p_ac3dec->audblk.cpldeltba, p_ac3dec->audblk.cpldeltlen, excite, mask);
+ ba_compute_mask (start, end, p_ac3dec->syncinfo.fscod,
+ p_ac3dec->audblk.cpldeltbae,
+ p_ac3dec->audblk.cpldeltnseg,
+ p_ac3dec->audblk.cpldeltoffst,
+ p_ac3dec->audblk.cpldeltba,
+ p_ac3dec->audblk.cpldeltlen, excite, mask);
- ba_compute_bap(start, end, snroffset, psd, mask, p_ac3dec->audblk.cpl_bap);
+ ba_compute_bap (start, end, snroffset, psd, mask,
+ p_ac3dec->audblk.cpl_bap);
}
- if(p_ac3dec->bsi.lfeon)
- {
+ if (p_ac3dec->bsi.lfeon) {
start = 0;
end = 7;
fgain = fastgain[p_ac3dec->audblk.lfefgaincod];
fastleak = 0;
slowleak = 0;
- ba_compute_psd(start, end, p_ac3dec->audblk.lfe_exp, psd, bndpsd);
+ ba_compute_psd (start, end, p_ac3dec->audblk.lfe_exp, psd, bndpsd);
- ba_compute_excitation(start, end , fgain, fastleak, slowleak, 1, bndpsd, excite);
+ ba_compute_excitation (start, end , fgain, fastleak, slowleak, 1,
+ bndpsd, excite);
- ba_compute_mask(start, end, p_ac3dec->syncinfo.fscod, 2, 0, 0, 0, 0, excite, mask);
+ ba_compute_mask (start, end, p_ac3dec->syncinfo.fscod, 2, 0, 0, 0, 0,
+ excite, mask);
- ba_compute_bap(start, end, snroffset, psd, mask, p_ac3dec->audblk.lfe_bap);
+ ba_compute_bap (start, end, snroffset, psd, mask,
+ p_ac3dec->audblk.lfe_bap);
}
}
-static void ba_compute_psd(s16 start, s16 end, s16 exps[],
- s16 psd[], s16 bndpsd[])
+static void ba_compute_psd (s16 start, s16 end, s16 exps[], s16 psd[],
+ s16 bndpsd[])
{
int bin,i,j,k;
s16 lastbin = 0;
/* Map the exponents into dBs */
- for (bin=start; bin<end; bin++)
- {
+ for (bin=start; bin<end; bin++) {
psd[bin] = (3072 - (exps[bin] << 7));
}
j = start;
k = masktab[start];
- do
- {
+ do {
lastbin = min(bndtab[k] + bndsz[k], end);
bndpsd[k] = psd[j];
j++;
- for (i = j; i < lastbin; i++)
- {
+ for (i = j; i < lastbin; i++) {
bndpsd[k] = logadd(bndpsd[k], psd[j]);
j++;
}
} while (end > lastbin);
}
-static void ba_compute_excitation(s16 start, s16 end,s16 fgain,
- s16 fastleak, s16 slowleak, s16 is_lfe, s16 bndpsd[],
- s16 excite[])
+static void ba_compute_excitation (s16 start, s16 end,s16 fgain, s16 fastleak,
+ s16 slowleak, s16 is_lfe, s16 bndpsd[],
+ s16 excite[])
{
int bin;
s16 bndstrt;
bndstrt = masktab[start];
bndend = masktab[end - 1] + 1;
- if (bndstrt == 0) /* For fbw and lfe channels */
- {
+ if (bndstrt == 0) { /* For fbw and lfe channels */
lowcomp = calc_lowcomp(lowcomp, bndpsd[0], bndpsd[1], 0);
excite[0] = bndpsd[0] - fgain - lowcomp;
lowcomp = calc_lowcomp(lowcomp, bndpsd[1], bndpsd[2], 1);
begin = 7 ;
/* Note: Do not call calc_lowcomp() for the last band of the lfe channel, (bin = 6) */
- for (bin = 2; bin < 7; bin++)
- {
+ for (bin = 2; bin < 7; bin++) {
if (!(is_lfe && (bin == 6)))
- lowcomp = calc_lowcomp(lowcomp, bndpsd[bin], bndpsd[bin+1], bin);
- fastleak = bndpsd[bin] - fgain;
- slowleak = bndpsd[bin] - sgain;
- excite[bin] = fastleak - lowcomp;
+ lowcomp = calc_lowcomp (lowcomp, bndpsd[bin], bndpsd[bin+1], bin);
+ fastleak = bndpsd[bin] - fgain;
+ slowleak = bndpsd[bin] - sgain;
+ excite[bin] = fastleak - lowcomp;
- if (!(is_lfe && (bin == 6)))
- {
- if (bndpsd[bin] <= bndpsd[bin+1])
- {
+ if (!(is_lfe && (bin == 6))) {
+ if (bndpsd[bin] <= bndpsd[bin+1]) {
begin = bin + 1 ;
break;
}
}
}
- for (bin = begin; bin < min(bndend, 22); bin++)
- {
+ for (bin = begin; bin < min(bndend, 22); bin++) {
if (!(is_lfe && (bin == 6)))
- lowcomp = calc_lowcomp(lowcomp, bndpsd[bin], bndpsd[bin+1], bin);
- fastleak -= fdecay ;
- fastleak = max(fastleak, bndpsd[bin] - fgain);
- slowleak -= sdecay ;
- slowleak = max(slowleak, bndpsd[bin] - sgain);
- excite[bin] = max(fastleak - lowcomp, slowleak);
+ lowcomp = calc_lowcomp (lowcomp, bndpsd[bin], bndpsd[bin+1], bin);
+ fastleak -= fdecay ;
+ fastleak = max(fastleak, bndpsd[bin] - fgain);
+ slowleak -= sdecay ;
+ slowleak = max(slowleak, bndpsd[bin] - sgain);
+ excite[bin] = max(fastleak - lowcomp, slowleak);
}
begin = 22;
- }
- else /* For coupling channel */
- {
+ } else { /* For coupling channel */
begin = bndstrt;
}
- for (bin = begin; bin < bndend; bin++)
- {
+ for (bin = begin; bin < bndend; bin++) {
fastleak -= fdecay;
fastleak = max(fastleak, bndpsd[bin] - fgain);
slowleak -= sdecay;
}
}
-static void ba_compute_mask(s16 start, s16 end, u16 fscod,
- u16 deltbae, u16 deltnseg, u16 deltoffst[], u16 deltba[],
- u16 deltlen[], s16 excite[], s16 mask[])
+static void ba_compute_mask (s16 start, s16 end, u16 fscod, u16 deltbae,
+ u16 deltnseg, u16 deltoffst[], u16 deltba[],
+ u16 deltlen[], s16 excite[], s16 mask[])
{
int bin,k;
s16 bndstrt;
bndend = masktab[end - 1] + 1;
/* Compute the masking curve */
- for (bin = bndstrt; bin < bndend; bin++)
- {
- if (bndpsd[bin] < dbknee)
- {
+ for (bin = bndstrt; bin < bndend; bin++) {
+ if (bndpsd[bin] < dbknee) {
excite[bin] += ((dbknee - bndpsd[bin]) >> 2);
}
mask[bin] = max(excite[bin], hth[fscod][bin]);
}
/* Perform delta bit modulation if necessary */
- if ((deltbae == DELTA_BIT_REUSE) || (deltbae == DELTA_BIT_NEW))
- {
+ if ((deltbae == DELTA_BIT_REUSE) || (deltbae == DELTA_BIT_NEW)) {
s16 band = 0;
s16 seg = 0;
- for (seg = 0; seg < deltnseg+1; seg++)
- {
+ for (seg = 0; seg < deltnseg+1; seg++) {
band += deltoffst[seg];
- if (deltba[seg] >= 4)
- {
+ if (deltba[seg] >= 4) {
delta = (deltba[seg] - 3) << 7;
- }
- else
- {
+ } else {
delta = (deltba[seg] - 4) << 7;
}
- for (k = 0; k < deltlen[seg]; k++)
- {
- mask[band] += delta;
- band++;
+ for (k = 0; k < deltlen[seg]; k++) {
+ mask[band] += delta;
+ band++;
}
}
}
}
-static void ba_compute_bap(s16 start, s16 end, s16 snroffset,
- s16 psd[], s16 mask[], s16 bap[])
+static void ba_compute_bap (s16 start, s16 end, s16 snroffset, s16 psd[],
+ s16 mask[], s16 bap[])
{
int i,j,k;
s16 lastbin = 0;
i = start;
j = masktab[start];
- do
- {
+ do {
lastbin = min(bndtab[j] + bndsz[j], end);
mask[j] -= snroffset;
mask[j] -= floor;
mask[j] &= 0x1fe0;
mask[j] += floor;
- for (k = i; k < lastbin; k++)
- {
+ for (k = i; k < lastbin; k++) {
address = (psd[i] - mask[j]) >> 5;
address = min(63, max(0, address));
bap[i] = baptab[address];
projects / vlc / blobdiff