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bands.c
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/* Copyright (c) 2007-2008 CSIRO
Copyright (c) 2007-2009 Xiph.Org Foundation
Copyright (c) 2008-2009 Gregory Maxwell
Written by Jean-Marc Valin and Gregory Maxwell */
/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include "bands.h"
#include "modes.h"
#include "vq.h"
#include "cwrs.h"
#include "stack_alloc.h"
#include "os_support.h"
#include "mathops.h"
#include "rate.h"
#include "quant_bands.h"
#include "pitch.h"
int hysteresis_decision(opus_val16 val, const opus_val16 *thresholds, const opus_val16 *hysteresis, int N, int prev)
{
int i;
for (i=0;i<N;i++)
{
if (val < thresholds[i])
break;
}
if (i>prev && val < thresholds[prev]+hysteresis[prev])
i=prev;
if (i<prev && val > thresholds[prev-1]-hysteresis[prev-1])
i=prev;
return i;
}
opus_uint32 celt_lcg_rand(opus_uint32 seed)
{
return 1664525 * seed + 1013904223;
}
/* This is a cos() approximation designed to be bit-exact on any platform. Bit exactness
with this approximation is important because it has an impact on the bit allocation */
opus_int16 bitexact_cos(opus_int16 x)
{
opus_int32 tmp;
opus_int16 x2;
tmp = (4096+((opus_int32)(x)*(x)))>>13;
celt_sig_assert(tmp<=32767);
x2 = tmp;
x2 = (32767-x2) + FRAC_MUL16(x2, (-7651 + FRAC_MUL16(x2, (8277 + FRAC_MUL16(-626, x2)))));
celt_sig_assert(x2<=32766);
return 1+x2;
}
int bitexact_log2tan(int isin,int icos)
{
int lc;
int ls;
lc=EC_ILOG(icos);
ls=EC_ILOG(isin);
icos<<=15-lc;
isin<<=15-ls;
return (ls-lc)*(1<<11)
+FRAC_MUL16(isin, FRAC_MUL16(isin, -2597) + 7932)
-FRAC_MUL16(icos, FRAC_MUL16(icos, -2597) + 7932);
}
#ifdef FIXED_POINT
/* Compute the amplitude (sqrt energy) in each of the bands */
void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bandE, int end, int C, int LM, int arch)
{
int i, c, N;
const opus_int16 *eBands = m->eBands;
(void)arch;
N = m->shortMdctSize<<LM;
c=0; do {
for (i=0;i<end;i++)
{
int j;
opus_val32 maxval=0;
opus_val32 sum = 0;
maxval = celt_maxabs32(&X[c*N+(eBands[i]<<LM)], (eBands[i+1]-eBands[i])<<LM);
if (maxval > 0)
{
int shift, shift2;
shift = celt_ilog2(maxval) - 14;
shift2 = (((m->logN[i]>>BITRES)+LM+1)>>1);
j=eBands[i]<<LM;
if (shift>0)
{
do {
sum = ADD32(sum, SHR32(MULT16_16(EXTRACT16(SHR32(X[j+c*N],shift)),
EXTRACT16(SHR32(X[j+c*N],shift))), 2*shift2));
} while (++j<eBands[i+1]<<LM);
} else {
do {
sum = ADD32(sum, SHR32(MULT16_16(EXTRACT16(SHL32(X[j+c*N],-shift)),
EXTRACT16(SHL32(X[j+c*N],-shift))), 2*shift2));
} while (++j<eBands[i+1]<<LM);
}
shift+=shift2;
while (sum < 1<<28) {
sum <<=2;
shift -= 1;
}
/* We're adding one here to ensure the normalized band isn't larger than unity norm */
bandE[i+c*m->nbEBands] = EPSILON+VSHR32(celt_sqrt(sum),-shift);
} else {
bandE[i+c*m->nbEBands] = EPSILON;
}
/*printf ("%f ", bandE[i+c*m->nbEBands]);*/
}
} while (++c<C);
/*printf ("\n");*/
}
/* Normalise each band such that the energy is one. */
void normalise_bands(const CELTMode *m, const celt_sig * OPUS_RESTRICT freq, celt_norm * OPUS_RESTRICT X, const celt_ener *bandE, int end, int C, int M)
{
int i, c, N;
const opus_int16 *eBands = m->eBands;
N = M*m->shortMdctSize;
c=0; do {
i=0; do {
opus_val16 g;
int j,shift;
opus_val32 E;
shift = celt_zlog2(bandE[i+c*m->nbEBands])-14;
E = VSHR32(bandE[i+c*m->nbEBands], shift-2);
g = EXTRACT16(celt_rcp(E));
if (shift > 0) {
j=M*eBands[i]; do {
X[j+c*N] = PSHR32(MULT16_32_Q15(g, freq[j+c*N]),shift);
} while (++j<M*eBands[i+1]);
} else {
j=M*eBands[i]; do {
X[j+c*N] = SHL32(MULT16_32_Q15(g, freq[j+c*N]),-shift);
} while (++j<M*eBands[i+1]);
}
} while (++i<end);
} while (++c<C);
}
#else /* FIXED_POINT */
/* Compute the amplitude (sqrt energy) in each of the bands */
void compute_band_energies(const CELTMode *m, const celt_sig *X, celt_ener *bandE, int end, int C, int LM, int arch)
{
int i, c, N;
const opus_int16 *eBands = m->eBands;
N = m->shortMdctSize<<LM;
c=0; do {
for (i=0;i<end;i++)
{
opus_val32 sum;
sum = 1e-27f + celt_inner_prod(&X[c*N+(eBands[i]<<LM)], &X[c*N+(eBands[i]<<LM)], (eBands[i+1]-eBands[i])<<LM, arch);
bandE[i+c*m->nbEBands] = celt_sqrt(sum);
/*printf ("%f ", bandE[i+c*m->nbEBands]);*/
}
} while (++c<C);
/*printf ("\n");*/
}
/* Normalise each band such that the energy is one. */
void normalise_bands(const CELTMode *m, const celt_sig * OPUS_RESTRICT freq, celt_norm * OPUS_RESTRICT X, const celt_ener *bandE, int end, int C, int M)
{
int i, c, N;
const opus_int16 *eBands = m->eBands;
N = M*m->shortMdctSize;
c=0; do {
for (i=0;i<end;i++)
{
int j;
opus_val16 g = 1.f/(1e-27f+bandE[i+c*m->nbEBands]);
for (j=M*eBands[i];j<M*eBands[i+1];j++)
X[j+c*N] = freq[j+c*N]*g;
}
} while (++c<C);
}
#endif /* FIXED_POINT */
/* De-normalise the energy to produce the synthesis from the unit-energy bands */
void denormalise_bands(const CELTMode *m, const celt_norm * OPUS_RESTRICT X,
celt_sig * OPUS_RESTRICT freq, const celt_glog *bandLogE, int start,
int end, int M, int downsample, int silence)
{
int i, N;
int bound;
celt_sig * OPUS_RESTRICT f;
const celt_norm * OPUS_RESTRICT x;
const opus_int16 *eBands = m->eBands;
N = M*m->shortMdctSize;
bound = M*eBands[end];
if (downsample!=1)
bound = IMIN(bound, N/downsample);
if (silence)
{
bound = 0;
start = end = 0;
}
f = freq;
x = X+M*eBands[start];
for (i=0;i<M*eBands[start];i++)
*f++ = 0;
for (i=start;i<end;i++)
{
int j, band_end;
opus_val32 g;
celt_glog lg;
#ifdef FIXED_POINT
int shift;
#endif
j=M*eBands[i];
band_end = M*eBands[i+1];
lg = ADD32(bandLogE[i], SHL32((opus_val32)eMeans[i],DB_SHIFT-4));
#ifndef FIXED_POINT
g = celt_exp2_db(MIN32(32.f, lg));
#else
/* Handle the integer part of the log energy */
shift = 15-(lg>>DB_SHIFT);
if (shift>31)
{
shift=0;
g=0;
} else {
/* Handle the fractional part. */
g = celt_exp2_db_frac((lg&((1<<DB_SHIFT)-1)));
}
/* Handle extreme gains with negative shift. */
if (shift<0)
{
/* For shift <= -2 and g > 16384 we'd be likely to overflow, so we're
capping the gain here, which is equivalent to a cap of 18 on lg.
This shouldn't trigger unless the bitstream is already corrupted. */
if (shift <= -2)
{
g = 16384*32768;
shift = -2;
}
do {
*f++ = SHL32(MULT16_32_Q15(*x, g), -shift);
x++;
} while (++j<band_end);
} else
#endif
/* Be careful of the fixed-point "else" just above when changing this code */
do {
*f++ = SHR32(MULT16_32_Q15(*x, g), shift);
x++;
} while (++j<band_end);
}
celt_assert(start <= end);
OPUS_CLEAR(&freq[bound], N-bound);
}
/* This prevents energy collapse for transients with multiple short MDCTs */
void anti_collapse(const CELTMode *m, celt_norm *X_, unsigned char *collapse_masks, int LM, int C, int size,
int start, int end, const celt_glog *logE, const celt_glog *prev1logE,
const celt_glog *prev2logE, const int *pulses, opus_uint32 seed, int encode, int arch)
{
int c, i, j, k;
for (i=start;i<end;i++)
{
int N0;
opus_val16 thresh, sqrt_1;
int depth;
#ifdef FIXED_POINT
int shift;
opus_val32 thresh32;
#endif
N0 = m->eBands[i+1]-m->eBands[i];
/* depth in 1/8 bits */
celt_sig_assert(pulses[i]>=0);
depth = celt_udiv(1+pulses[i], (m->eBands[i+1]-m->eBands[i]))>>LM;
#ifdef FIXED_POINT
thresh32 = SHR32(celt_exp2(-SHL16(depth, 10-BITRES)),1);
thresh = MULT16_32_Q15(QCONST16(0.5f, 15), MIN32(32767,thresh32));
{
opus_val32 t;
t = N0<<LM;
shift = celt_ilog2(t)>>1;
t = SHL32(t, (7-shift)<<1);
sqrt_1 = celt_rsqrt_norm(t);
}
#else
thresh = .5f*celt_exp2(-.125f*depth);
sqrt_1 = celt_rsqrt(N0<<LM);
#endif
c=0; do
{
celt_norm *X;
celt_glog prev1;
celt_glog prev2;
opus_val32 Ediff;
opus_val16 r;
int renormalize=0;
prev1 = prev1logE[c*m->nbEBands+i];
prev2 = prev2logE[c*m->nbEBands+i];
if (!encode && C==1)
{
prev1 = MAXG(prev1,prev1logE[m->nbEBands+i]);
prev2 = MAXG(prev2,prev2logE[m->nbEBands+i]);
}
Ediff = logE[c*m->nbEBands+i]-MING(prev1,prev2);
Ediff = MAX32(0, Ediff);
#ifdef FIXED_POINT
if (Ediff < GCONST(16.f))
{
opus_val32 r32 = SHR32(celt_exp2_db(-Ediff),1);
r = 2*MIN16(16383,r32);
} else {
r = 0;
}
if (LM==3)
r = MULT16_16_Q14(23170, MIN32(23169, r));
r = SHR16(MIN16(thresh, r),1);
r = SHR32(MULT16_16_Q15(sqrt_1, r),shift);
#else
/* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because
short blocks don't have the same energy as long */
r = 2.f*celt_exp2_db(-Ediff);
if (LM==3)
r *= 1.41421356f;
r = MIN16(thresh, r);
r = r*sqrt_1;
#endif
X = X_+c*size+(m->eBands[i]<<LM);
for (k=0;k<1<<LM;k++)
{
/* Detect collapse */
if (!(collapse_masks[i*C+c]&1<<k))
{
/* Fill with noise */
for (j=0;j<N0;j++)
{
seed = celt_lcg_rand(seed);
X[(j<<LM)+k] = (seed&0x8000 ? r : -r);
}
renormalize = 1;
}
}
/* We just added some energy, so we need to renormalise */
if (renormalize)
renormalise_vector(X, N0<<LM, Q31ONE, arch);
} while (++c<C);
}
}
/* Compute the weights to use for optimizing normalized distortion across
channels. We use the amplitude to weight square distortion, which means
that we use the square root of the value we would have been using if we
wanted to minimize the MSE in the non-normalized domain. This roughly
corresponds to some quick-and-dirty perceptual experiments I ran to
measure inter-aural masking (there doesn't seem to be any published data
on the topic). */
static void compute_channel_weights(celt_ener Ex, celt_ener Ey, opus_val16 w[2])
{
celt_ener minE;
#ifdef FIXED_POINT
int shift;
#endif
minE = MIN32(Ex, Ey);
/* Adjustment to make the weights a bit more conservative. */
Ex = ADD32(Ex, minE/3);
Ey = ADD32(Ey, minE/3);
#ifdef FIXED_POINT
shift = celt_ilog2(EPSILON+MAX32(Ex, Ey))-14;
#endif
w[0] = VSHR32(Ex, shift);
w[1] = VSHR32(Ey, shift);
}
static void intensity_stereo(const CELTMode *m, celt_norm * OPUS_RESTRICT X, const celt_norm * OPUS_RESTRICT Y, const celt_ener *bandE, int bandID, int N)
{
int i = bandID;
int j;
opus_val16 a1, a2;
opus_val16 left, right;
opus_val16 norm;
#ifdef FIXED_POINT
int shift = celt_zlog2(MAX32(bandE[i], bandE[i+m->nbEBands]))-13;
#endif
left = VSHR32(bandE[i],shift);
right = VSHR32(bandE[i+m->nbEBands],shift);
norm = EPSILON + celt_sqrt(EPSILON+MULT16_16(left,left)+MULT16_16(right,right));
a1 = DIV32_16(SHL32(EXTEND32(left),14),norm);
a2 = DIV32_16(SHL32(EXTEND32(right),14),norm);
for (j=0;j<N;j++)
{
celt_norm r, l;
l = X[j];
r = Y[j];
X[j] = EXTRACT16(SHR32(MAC16_16(MULT16_16(a1, l), a2, r), 14));
/* Side is not encoded, no need to calculate */
}
}
static void stereo_split(celt_norm * OPUS_RESTRICT X, celt_norm * OPUS_RESTRICT Y, int N)
{
int j;
for (j=0;j<N;j++)
{
opus_val32 r, l;
l = MULT16_16(QCONST16(.70710678f, 15), X[j]);
r = MULT16_16(QCONST16(.70710678f, 15), Y[j]);
X[j] = EXTRACT16(SHR32(ADD32(l, r), 15));
Y[j] = EXTRACT16(SHR32(SUB32(r, l), 15));
}
}
static void stereo_merge(celt_norm * OPUS_RESTRICT X, celt_norm * OPUS_RESTRICT Y, opus_val32 mid, int N, int arch)
{
int j;
opus_val32 xp=0, side=0;
opus_val32 El, Er;
#ifdef FIXED_POINT
int kl, kr;
#endif
opus_val32 t, lgain, rgain;
/* Compute the norm of X+Y and X-Y as |X|^2 + |Y|^2 +/- sum(xy) */
dual_inner_prod(Y, X, Y, N, &xp, &side, arch);
/* Compensating for the mid normalization */
xp = MULT32_32_Q31(mid, xp);
/* mid and side are in Q15, not Q14 like X and Y */
El = SHR32(MULT32_32_Q31(mid, mid),3) + side - 2*xp;
Er = SHR32(MULT32_32_Q31(mid, mid),3) + side + 2*xp;
if (Er < QCONST32(6e-4f, 28) || El < QCONST32(6e-4f, 28))
{
OPUS_COPY(Y, X, N);
return;
}
#ifdef FIXED_POINT
kl = celt_ilog2(El)>>1;
kr = celt_ilog2(Er)>>1;
#endif
t = VSHR32(El, (kl-7)<<1);
lgain = celt_rsqrt_norm(t);
t = VSHR32(Er, (kr-7)<<1);
rgain = celt_rsqrt_norm(t);
#ifdef FIXED_POINT
if (kl < 7)
kl = 7;
if (kr < 7)
kr = 7;
#endif
for (j=0;j<N;j++)
{
celt_norm r, l;
/* Apply mid scaling (side is already scaled) */
l = MULT32_32_Q31(mid, X[j]);
r = Y[j];
X[j] = EXTRACT16(PSHR32(MULT16_16(lgain, SUB16(l,r)), kl+1));
Y[j] = EXTRACT16(PSHR32(MULT16_16(rgain, ADD16(l,r)), kr+1));
}
}
/* Decide whether we should spread the pulses in the current frame */
int spreading_decision(const CELTMode *m, const celt_norm *X, int *average,
int last_decision, int *hf_average, int *tapset_decision, int update_hf,
int end, int C, int M, const int *spread_weight)
{
int i, c, N0;
int sum = 0, nbBands=0;
const opus_int16 * OPUS_RESTRICT eBands = m->eBands;
int decision;
int hf_sum=0;
celt_assert(end>0);
N0 = M*m->shortMdctSize;
if (M*(eBands[end]-eBands[end-1]) <= 8)
return SPREAD_NONE;
c=0; do {
for (i=0;i<end;i++)
{
int j, N, tmp=0;
int tcount[3] = {0,0,0};
const celt_norm * OPUS_RESTRICT x = X+M*eBands[i]+c*N0;
N = M*(eBands[i+1]-eBands[i]);
if (N<=8)
continue;
/* Compute rough CDF of |x[j]| */
for (j=0;j<N;j++)
{
opus_val32 x2N; /* Q13 */
x2N = MULT16_16(MULT16_16_Q15(x[j], x[j]), N);
if (x2N < QCONST16(0.25f,13))
tcount[0]++;
if (x2N < QCONST16(0.0625f,13))
tcount[1]++;
if (x2N < QCONST16(0.015625f,13))
tcount[2]++;
}
/* Only include four last bands (8 kHz and up) */
if (i>m->nbEBands-4)
hf_sum += celt_udiv(32*(tcount[1]+tcount[0]), N);
tmp = (2*tcount[2] >= N) + (2*tcount[1] >= N) + (2*tcount[0] >= N);
sum += tmp*spread_weight[i];
nbBands+=spread_weight[i];
}
} while (++c<C);
if (update_hf)
{
if (hf_sum)
hf_sum = celt_udiv(hf_sum, C*(4-m->nbEBands+end));
*hf_average = (*hf_average+hf_sum)>>1;
hf_sum = *hf_average;
if (*tapset_decision==2)
hf_sum += 4;
else if (*tapset_decision==0)
hf_sum -= 4;
if (hf_sum > 22)
*tapset_decision=2;
else if (hf_sum > 18)
*tapset_decision=1;
else
*tapset_decision=0;
}
/*printf("%d %d %d\n", hf_sum, *hf_average, *tapset_decision);*/
celt_assert(nbBands>0); /* end has to be non-zero */
celt_assert(sum>=0);
sum = celt_udiv((opus_int32)sum<<8, nbBands);
/* Recursive averaging */
sum = (sum+*average)>>1;
*average = sum;
/* Hysteresis */
sum = (3*sum + (((3-last_decision)<<7) + 64) + 2)>>2;
if (sum < 80)
{
decision = SPREAD_AGGRESSIVE;
} else if (sum < 256)
{
decision = SPREAD_NORMAL;
} else if (sum < 384)
{
decision = SPREAD_LIGHT;
} else {
decision = SPREAD_NONE;
}
#ifdef FUZZING
decision = rand()&0x3;
*tapset_decision=rand()%3;
#endif
return decision;
}
/* Indexing table for converting from natural Hadamard to ordery Hadamard
This is essentially a bit-reversed Gray, on top of which we've added
an inversion of the order because we want the DC at the end rather than
the beginning. The lines are for N=2, 4, 8, 16 */
static const int ordery_table[] = {
1, 0,
3, 0, 2, 1,
7, 0, 4, 3, 6, 1, 5, 2,
15, 0, 8, 7, 12, 3, 11, 4, 14, 1, 9, 6, 13, 2, 10, 5,
};
static void deinterleave_hadamard(celt_norm *X, int N0, int stride, int hadamard)
{
int i,j;
VARDECL(celt_norm, tmp);
int N;
SAVE_STACK;
N = N0*stride;
ALLOC(tmp, N, celt_norm);
celt_assert(stride>0);
if (hadamard)
{
const int *ordery = ordery_table+stride-2;
for (i=0;i<stride;i++)
{
for (j=0;j<N0;j++)
tmp[ordery[i]*N0+j] = X[j*stride+i];
}
} else {
for (i=0;i<stride;i++)
for (j=0;j<N0;j++)
tmp[i*N0+j] = X[j*stride+i];
}
OPUS_COPY(X, tmp, N);
RESTORE_STACK;
}
static void interleave_hadamard(celt_norm *X, int N0, int stride, int hadamard)
{
int i,j;
VARDECL(celt_norm, tmp);
int N;
SAVE_STACK;
N = N0*stride;
ALLOC(tmp, N, celt_norm);
if (hadamard)
{
const int *ordery = ordery_table+stride-2;
for (i=0;i<stride;i++)
for (j=0;j<N0;j++)
tmp[j*stride+i] = X[ordery[i]*N0+j];
} else {
for (i=0;i<stride;i++)
for (j=0;j<N0;j++)
tmp[j*stride+i] = X[i*N0+j];
}
OPUS_COPY(X, tmp, N);
RESTORE_STACK;
}
void haar1(celt_norm *X, int N0, int stride)
{
int i, j;
N0 >>= 1;
for (i=0;i<stride;i++)
for (j=0;j<N0;j++)
{
opus_val32 tmp1, tmp2;
tmp1 = MULT16_16(QCONST16(.70710678f,15), X[stride*2*j+i]);
tmp2 = MULT16_16(QCONST16(.70710678f,15), X[stride*(2*j+1)+i]);
X[stride*2*j+i] = EXTRACT16(PSHR32(ADD32(tmp1, tmp2), 15));
X[stride*(2*j+1)+i] = EXTRACT16(PSHR32(SUB32(tmp1, tmp2), 15));
}
}
static int compute_qn(int N, int b, int offset, int pulse_cap, int stereo)
{
static const opus_int16 exp2_table8[8] =
{16384, 17866, 19483, 21247, 23170, 25267, 27554, 30048};
int qn, qb;
int N2 = 2*N-1;
if (stereo && N==2)
N2--;
/* The upper limit ensures that in a stereo split with itheta==16384, we'll
always have enough bits left over to code at least one pulse in the
side; otherwise it would collapse, since it doesn't get folded. */
qb = celt_sudiv(b+N2*offset, N2);
qb = IMIN(b-pulse_cap-(4<<BITRES), qb);
qb = IMIN(8<<BITRES, qb);
if (qb<(1<<BITRES>>1)) {
qn = 1;
} else {
qn = exp2_table8[qb&0x7]>>(14-(qb>>BITRES));
qn = (qn+1)>>1<<1;
}
celt_assert(qn <= 256);
return qn;
}
struct band_ctx {
int encode;
int resynth;
const CELTMode *m;
int i;
int intensity;
int spread;
int tf_change;
ec_ctx *ec;
opus_int32 remaining_bits;
const celt_ener *bandE;
opus_uint32 seed;
int arch;
int theta_round;
int disable_inv;
int avoid_split_noise;
};
struct split_ctx {
int inv;
int imid;
int iside;
int delta;
int itheta;
int qalloc;
};
static void compute_theta(struct band_ctx *ctx, struct split_ctx *sctx,
celt_norm *X, celt_norm *Y, int N, int *b, int B, int B0,
int LM,
int stereo, int *fill)
{
int qn;
int itheta=0;
int delta;
int imid, iside;
int qalloc;
int pulse_cap;
int offset;
opus_int32 tell;
int inv=0;
int encode;
const CELTMode *m;
int i;
int intensity;
ec_ctx *ec;
const celt_ener *bandE;
encode = ctx->encode;
m = ctx->m;
i = ctx->i;
intensity = ctx->intensity;
ec = ctx->ec;
bandE = ctx->bandE;
/* Decide on the resolution to give to the split parameter theta */
pulse_cap = m->logN[i]+LM*(1<<BITRES);
offset = (pulse_cap>>1) - (stereo&&N==2 ? QTHETA_OFFSET_TWOPHASE : QTHETA_OFFSET);
qn = compute_qn(N, *b, offset, pulse_cap, stereo);
if (stereo && i>=intensity)
qn = 1;
if (encode)
{
/* theta is the atan() of the ratio between the (normalized)
side and mid. With just that parameter, we can re-scale both
mid and side because we know that 1) they have unit norm and
2) they are orthogonal. */
itheta = stereo_itheta(X, Y, stereo, N, ctx->arch);
}
tell = ec_tell_frac(ec);
if (qn!=1)
{
if (encode)
{
if (!stereo || ctx->theta_round == 0)
{
itheta = (itheta*(opus_int32)qn+8192)>>14;
if (!stereo && ctx->avoid_split_noise && itheta > 0 && itheta < qn)
{
/* Check if the selected value of theta will cause the bit allocation
to inject noise on one side. If so, make sure the energy of that side
is zero. */
int unquantized = celt_udiv((opus_int32)itheta*16384, qn);
imid = bitexact_cos((opus_int16)unquantized);
iside = bitexact_cos((opus_int16)(16384-unquantized));
delta = FRAC_MUL16((N-1)<<7,bitexact_log2tan(iside,imid));
if (delta > *b)
itheta = qn;
else if (delta < -*b)
itheta = 0;
}
} else {
int down;
/* Bias quantization towards itheta=0 and itheta=16384. */
int bias = itheta > 8192 ? 32767/qn : -32767/qn;
down = IMIN(qn-1, IMAX(0, (itheta*(opus_int32)qn + bias)>>14));
if (ctx->theta_round < 0)
itheta = down;
else
itheta = down+1;
}
}
/* Entropy coding of the angle. We use a uniform pdf for the
time split, a step for stereo, and a triangular one for the rest. */
if (stereo && N>2)
{
int p0 = 3;
int x = itheta;
int x0 = qn/2;
int ft = p0*(x0+1) + x0;
/* Use a probability of p0 up to itheta=8192 and then use 1 after */
if (encode)
{
ec_encode(ec,x<=x0?p0*x:(x-1-x0)+(x0+1)*p0,x<=x0?p0*(x+1):(x-x0)+(x0+1)*p0,ft);
} else {
int fs;
fs=ec_decode(ec,ft);
if (fs<(x0+1)*p0)
x=fs/p0;
else
x=x0+1+(fs-(x0+1)*p0);
ec_dec_update(ec,x<=x0?p0*x:(x-1-x0)+(x0+1)*p0,x<=x0?p0*(x+1):(x-x0)+(x0+1)*p0,ft);
itheta = x;
}
} else if (B0>1 || stereo) {
/* Uniform pdf */
if (encode)
ec_enc_uint(ec, itheta, qn+1);
else
itheta = ec_dec_uint(ec, qn+1);
} else {
int fs=1, ft;
ft = ((qn>>1)+1)*((qn>>1)+1);
if (encode)
{
int fl;
fs = itheta <= (qn>>1) ? itheta + 1 : qn + 1 - itheta;
fl = itheta <= (qn>>1) ? itheta*(itheta + 1)>>1 :
ft - ((qn + 1 - itheta)*(qn + 2 - itheta)>>1);
ec_encode(ec, fl, fl+fs, ft);
} else {
/* Triangular pdf */
int fl=0;
int fm;
fm = ec_decode(ec, ft);
if (fm < ((qn>>1)*((qn>>1) + 1)>>1))
{
itheta = (isqrt32(8*(opus_uint32)fm + 1) - 1)>>1;
fs = itheta + 1;
fl = itheta*(itheta + 1)>>1;
}
else
{
itheta = (2*(qn + 1)
- isqrt32(8*(opus_uint32)(ft - fm - 1) + 1))>>1;
fs = qn + 1 - itheta;
fl = ft - ((qn + 1 - itheta)*(qn + 2 - itheta)>>1);
}
ec_dec_update(ec, fl, fl+fs, ft);
}
}
celt_assert(itheta>=0);
itheta = celt_udiv((opus_int32)itheta*16384, qn);
if (encode && stereo)
{
if (itheta==0)
intensity_stereo(m, X, Y, bandE, i, N);
else
stereo_split(X, Y, N);
}
/* NOTE: Renormalising X and Y *may* help fixed-point a bit at very high rate.
Let's do that at higher complexity */
} else if (stereo) {
if (encode)
{
inv = itheta > 8192 && !ctx->disable_inv;
if (inv)
{
int j;
for (j=0;j<N;j++)
Y[j] = -Y[j];
}
intensity_stereo(m, X, Y, bandE, i, N);
}
if (*b>2<<BITRES && ctx->remaining_bits > 2<<BITRES)
{
if (encode)
ec_enc_bit_logp(ec, inv, 2);
else
inv = ec_dec_bit_logp(ec, 2);
} else
inv = 0;
/* inv flag override to avoid problems with downmixing. */
if (ctx->disable_inv)
inv = 0;
itheta = 0;
}
qalloc = ec_tell_frac(ec) - tell;
*b -= qalloc;
if (itheta == 0)
{
imid = 32767;
iside = 0;
*fill &= (1<<B)-1;
delta = -16384;
} else if (itheta == 16384)
{
imid = 0;
iside = 32767;
*fill &= ((1<<B)-1)<<B;
delta = 16384;
} else {
imid = bitexact_cos((opus_int16)itheta);
iside = bitexact_cos((opus_int16)(16384-itheta));
/* This is the mid vs side allocation that minimizes squared error
in that band. */
delta = FRAC_MUL16((N-1)<<7,bitexact_log2tan(iside,imid));
}
sctx->inv = inv;
sctx->imid = imid;
sctx->iside = iside;
sctx->delta = delta;
sctx->itheta = itheta;
sctx->qalloc = qalloc;
}
static unsigned quant_band_n1(struct band_ctx *ctx, celt_norm *X, celt_norm *Y,
celt_norm *lowband_out)
{
int c;
int stereo;
celt_norm *x = X;
int encode;
ec_ctx *ec;
encode = ctx->encode;
ec = ctx->ec;
stereo = Y != NULL;
c=0; do {
int sign=0;
if (ctx->remaining_bits>=1<<BITRES)
{
if (encode)
{
sign = x[0]<0;
ec_enc_bits(ec, sign, 1);
} else {
sign = ec_dec_bits(ec, 1);
}
ctx->remaining_bits -= 1<<BITRES;
}
if (ctx->resynth)
x[0] = sign ? -NORM_SCALING : NORM_SCALING;
x = Y;
} while (++c<1+stereo);
if (lowband_out)
lowband_out[0] = SHR16(X[0],4);
return 1;
}
/* This function is responsible for encoding and decoding a mono partition.
It can split the band in two and transmit the energy difference with
the two half-bands. It can be called recursively so bands can end up being
split in 8 parts. */
static unsigned quant_partition(struct band_ctx *ctx, celt_norm *X,
int N, int b, int B, celt_norm *lowband,
int LM,
opus_val32 gain, int fill)
{
const unsigned char *cache;
int q;
int curr_bits;
int imid=0, iside=0;
int B0=B;
opus_val32 mid=0, side=0;
unsigned cm=0;
celt_norm *Y=NULL;
int encode;
const CELTMode *m;
int i;
int spread;
ec_ctx *ec;
encode = ctx->encode;
m = ctx->m;
i = ctx->i;
spread = ctx->spread;
ec = ctx->ec;
/* If we need 1.5 more bit than we can produce, split the band in two. */
cache = m->cache.bits + m->cache.index[(LM+1)*m->nbEBands+i];
if (LM != -1 && b > cache[cache[0]]+12 && N>2)
{
int mbits, sbits, delta;
int itheta;
int qalloc;
struct split_ctx sctx;
celt_norm *next_lowband2=NULL;
opus_int32 rebalance;
N >>= 1;
Y = X+N;
LM -= 1;
if (B==1)
fill = (fill&1)|(fill<<1);
B = (B+1)>>1;
compute_theta(ctx, &sctx, X, Y, N, &b, B, B0, LM, 0, &fill);
imid = sctx.imid;