ref: ea7c9869cd2ce21b441b9c3efa02658558b323d7
dir: /celt/celt.c/
/* Copyright (c) 2007-2008 CSIRO
Copyright (c) 2007-2010 Xiph.Org Foundation
Copyright (c) 2008 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
#define CELT_C
#include "os_support.h"
#include "mdct.h"
#include <math.h>
#include "celt.h"
#include "pitch.h"
#include "bands.h"
#include "modes.h"
#include "entcode.h"
#include "quant_bands.h"
#include "rate.h"
#include "stack_alloc.h"
#include "mathops.h"
#include "float_cast.h"
#include <stdarg.h>
#include "celt_lpc.h"
#include "vq.h"
#ifndef OPUS_VERSION
#define OPUS_VERSION "unknown"
#endif
#ifdef CUSTOM_MODES
#define OPUS_CUSTOM_NOSTATIC
#else
#define OPUS_CUSTOM_NOSTATIC static inline
#endif
static const unsigned char trim_icdf[11] = {126, 124, 119, 109, 87, 41, 19, 9, 4, 2, 0};
/* Probs: NONE: 21.875%, LIGHT: 6.25%, NORMAL: 65.625%, AGGRESSIVE: 6.25% */
static const unsigned char spread_icdf[4] = {25, 23, 2, 0};
static const unsigned char tapset_icdf[3]={2,1,0};
#ifdef CUSTOM_MODES
static const unsigned char toOpusTable[20] = {
0xE0, 0xE8, 0xF0, 0xF8,
0xC0, 0xC8, 0xD0, 0xD8,
0xA0, 0xA8, 0xB0, 0xB8,
0x00, 0x00, 0x00, 0x00,
0x80, 0x88, 0x90, 0x98,
};
static const unsigned char fromOpusTable[16] = {
0x80, 0x88, 0x90, 0x98,
0x40, 0x48, 0x50, 0x58,
0x20, 0x28, 0x30, 0x38,
0x00, 0x08, 0x10, 0x18
};
static inline int toOpus(unsigned char c)
{
int ret=0;
if (c<0xA0)
ret = toOpusTable[c>>3];
if (ret == 0)
return -1;
else
return ret|(c&0x7);
}
static inline int fromOpus(unsigned char c)
{
if (c<0x80)
return -1;
else
return fromOpusTable[(c>>3)-16] | (c&0x7);
}
#endif /* CUSTOM_MODES */
#define COMBFILTER_MAXPERIOD 1024
#define COMBFILTER_MINPERIOD 15
static int resampling_factor(opus_int32 rate)
{
int ret;
switch (rate)
{
case 48000:
ret = 1;
break;
case 24000:
ret = 2;
break;
case 16000:
ret = 3;
break;
case 12000:
ret = 4;
break;
case 8000:
ret = 6;
break;
default:
#ifndef CUSTOM_MODES
celt_assert(0);
#endif
ret = 0;
break;
}
return ret;
}
/** Encoder state
@brief Encoder state
*/
struct OpusCustomEncoder {
const OpusCustomMode *mode; /**< Mode used by the encoder */
int overlap;
int channels;
int stream_channels;
int force_intra;
int clip;
int disable_pf;
int complexity;
int upsample;
int start, end;
opus_int32 bitrate;
int vbr;
int signalling;
int constrained_vbr; /* If zero, VBR can do whatever it likes with the rate */
int loss_rate;
int lsb_depth;
/* Everything beyond this point gets cleared on a reset */
#define ENCODER_RESET_START rng
opus_uint32 rng;
int spread_decision;
opus_val32 delayedIntra;
int tonal_average;
int lastCodedBands;
int hf_average;
int tapset_decision;
int prefilter_period;
opus_val16 prefilter_gain;
int prefilter_tapset;
#ifdef RESYNTH
int prefilter_period_old;
opus_val16 prefilter_gain_old;
int prefilter_tapset_old;
#endif
int consec_transient;
AnalysisInfo analysis;
opus_val32 preemph_memE[2];
opus_val32 preemph_memD[2];
/* VBR-related parameters */
opus_int32 vbr_reservoir;
opus_int32 vbr_drift;
opus_int32 vbr_offset;
opus_int32 vbr_count;
opus_val16 overlap_max;
opus_val16 stereo_saving;
int intensity;
#ifdef RESYNTH
celt_sig syn_mem[2][2*MAX_PERIOD];
#endif
celt_sig in_mem[1]; /* Size = channels*mode->overlap */
/* celt_sig prefilter_mem[], Size = channels*COMBFILTER_MAXPERIOD */
/* opus_val16 oldBandE[], Size = channels*mode->nbEBands */
/* opus_val16 oldLogE[], Size = channels*mode->nbEBands */
/* opus_val16 oldLogE2[], Size = channels*mode->nbEBands */
#ifdef RESYNTH
/* opus_val16 overlap_mem[], Size = channels*overlap */
#endif
};
int celt_encoder_get_size(int channels)
{
CELTMode *mode = opus_custom_mode_create(48000, 960, NULL);
return opus_custom_encoder_get_size(mode, channels);
}
OPUS_CUSTOM_NOSTATIC int opus_custom_encoder_get_size(const CELTMode *mode, int channels)
{
int size = sizeof(struct CELTEncoder)
+ (channels*mode->overlap-1)*sizeof(celt_sig) /* celt_sig in_mem[channels*mode->overlap]; */
+ channels*COMBFILTER_MAXPERIOD*sizeof(celt_sig) /* celt_sig prefilter_mem[channels*COMBFILTER_MAXPERIOD]; */
+ 3*channels*mode->nbEBands*sizeof(opus_val16); /* opus_val16 oldBandE[channels*mode->nbEBands]; */
/* opus_val16 oldLogE[channels*mode->nbEBands]; */
/* opus_val16 oldLogE2[channels*mode->nbEBands]; */
#ifdef RESYNTH
size += channels*mode->overlap*sizeof(celt_sig); /* celt_sig overlap_mem[channels*mode->nbEBands]; */
#endif
return size;
}
#ifdef CUSTOM_MODES
CELTEncoder *opus_custom_encoder_create(const CELTMode *mode, int channels, int *error)
{
int ret;
CELTEncoder *st = (CELTEncoder *)opus_alloc(opus_custom_encoder_get_size(mode, channels));
/* init will handle the NULL case */
ret = opus_custom_encoder_init(st, mode, channels);
if (ret != OPUS_OK)
{
opus_custom_encoder_destroy(st);
st = NULL;
}
if (error)
*error = ret;
return st;
}
#endif /* CUSTOM_MODES */
int celt_encoder_init(CELTEncoder *st, opus_int32 sampling_rate, int channels)
{
int ret;
ret = opus_custom_encoder_init(st, opus_custom_mode_create(48000, 960, NULL), channels);
if (ret != OPUS_OK)
return ret;
st->upsample = resampling_factor(sampling_rate);
return OPUS_OK;
}
OPUS_CUSTOM_NOSTATIC int opus_custom_encoder_init(CELTEncoder *st, const CELTMode *mode, int channels)
{
if (channels < 0 || channels > 2)
return OPUS_BAD_ARG;
if (st==NULL || mode==NULL)
return OPUS_ALLOC_FAIL;
OPUS_CLEAR((char*)st, opus_custom_encoder_get_size(mode, channels));
st->mode = mode;
st->overlap = mode->overlap;
st->stream_channels = st->channels = channels;
st->upsample = 1;
st->start = 0;
st->end = st->mode->effEBands;
st->signalling = 1;
st->constrained_vbr = 1;
st->clip = 1;
st->bitrate = OPUS_BITRATE_MAX;
st->vbr = 0;
st->force_intra = 0;
st->complexity = 5;
st->lsb_depth=24;
opus_custom_encoder_ctl(st, OPUS_RESET_STATE);
return OPUS_OK;
}
#ifdef CUSTOM_MODES
void opus_custom_encoder_destroy(CELTEncoder *st)
{
opus_free(st);
}
#endif /* CUSTOM_MODES */
static inline opus_val16 SIG2WORD16(celt_sig x)
{
#ifdef FIXED_POINT
x = PSHR32(x, SIG_SHIFT);
x = MAX32(x, -32768);
x = MIN32(x, 32767);
return EXTRACT16(x);
#else
return (opus_val16)x;
#endif
}
static int transient_analysis(const opus_val32 * OPUS_RESTRICT in, int len, int C,
int overlap, opus_val16 *tf_estimate, int *tf_chan, AnalysisInfo *analysis)
{
int i;
VARDECL(opus_val16, tmp);
opus_val32 mem0,mem1;
int is_transient = 0;
int block;
int c, N;
opus_val16 maxbin;
int tf_max;
VARDECL(opus_val16, bins);
opus_val16 T1, T2, T3, T4, T5;
opus_val16 follower;
int metric=0;
int fmetric=0, bmetric=0;
int count1, count2, count3, count4, count5;
SAVE_STACK;
ALLOC(tmp, len, opus_val16);
block = overlap/4;
N=len/block-1;
ALLOC(bins, N, opus_val16);
tf_max = 0;
for (c=0;c<C;c++)
{
mem0=0;
mem1=0;
for (i=0;i<len;i++)
tmp[i] = SHR32(in[i+c*len],SIG_SHIFT);
/* High-pass filter: (1 - 2*z^-1 + z^-2) / (1 - z^-1 + .5*z^-2) */
for (i=0;i<len;i++)
{
opus_val32 x,y;
x = tmp[i];
y = ADD32(mem0, x);
#ifdef FIXED_POINT
mem0 = mem1 + y - SHL32(x,1);
mem1 = x - SHR32(y,1);
#else
mem0 = mem1 + y - 2*x;
mem1 = x - .5f*y;
#endif
tmp[i] = EXTRACT16(SHR(y,2));
}
/* First few samples are bad because we don't propagate the memory */
for (i=0;i<12;i++)
tmp[i] = 0;
maxbin=0;
for (i=0;i<N;i++)
{
int j;
opus_val16 max_abs=0;
for (j=0;j<2*block;j++)
max_abs = MAX16(max_abs, ABS16(tmp[i*block+j]));
bins[i] = max_abs;
maxbin = MAX16(maxbin, bins[i]);
}
T1 = QCONST16(.09f, 15);
T2 = QCONST16(.12f, 15);
T3 = QCONST16(.18f, 15);
T4 = QCONST16(.28f, 15);
T5 = QCONST16(.4f, 15);
follower = 0;
count1=count2=count3=count4=count5=0;
for (i=0;i<N;i++)
{
follower = MAX16(bins[i], MULT16_16_Q15(QCONST16(0.97f, 15), follower));
if (bins[i] < MULT16_16_Q15(T1, follower))
count1++;
if (bins[i] < MULT16_16_Q15(T2, follower))
count2++;
if (bins[i] < MULT16_16_Q15(T3, follower))
count3++;
if (bins[i] < MULT16_16_Q15(T4, follower))
count4++;
if (bins[i] < MULT16_16_Q15(T5, follower))
count5++;
}
fmetric = (5*count1 + 4*count2 + 3*count3 + 2*count4 + count5)/2;
follower=0;
count1=count2=count3=count4=count5=0;
for (i=N-1;i>=0;i--)
{
follower = MAX16(bins[i], MULT16_16_Q15(QCONST16(0.97f, 15), follower));
if (bins[i] < MULT16_16_Q15(T1, follower))
count1++;
if (bins[i] < MULT16_16_Q15(T2, follower))
count2++;
if (bins[i] < MULT16_16_Q15(T3, follower))
count3++;
if (bins[i] < MULT16_16_Q15(T4, follower))
count4++;
if (bins[i] < MULT16_16_Q15(T5, follower))
count5++;
}
bmetric = 5*count1 + 4*count2 + 3*count3 + 2*count4 + count5;
metric = fmetric+bmetric;
/*if (metric>40)*/
if (metric>20+50*MAX16(analysis->tonality, analysis->noisiness))
is_transient=1;
if (metric>tf_max)
{
*tf_chan = c;
tf_max = metric;
}
}
/* *tf_estimate = 1 + MIN16(1, sqrt(MAX16(0, tf_max-30))/20); */
*tf_estimate = QCONST16(1.f, 14) + celt_sqrt(MAX16(0, SHL32(MULT16_16(QCONST16(0.0069,14),IMIN(163,tf_max)),14)-QCONST32(0.139,28)));
RESTORE_STACK;
#ifdef FUZZING
is_transient = rand()&0x1;
#endif
/*printf("%d %f %f %f %f\n", is_transient, *tf_estimate, tf_max, analysis->tonality, analysis->noisiness);*/
return is_transient;
}
/** Apply window and compute the MDCT for all sub-frames and
all channels in a frame */
static void compute_mdcts(const CELTMode *mode, int shortBlocks, celt_sig * OPUS_RESTRICT in, celt_sig * OPUS_RESTRICT out, int C, int LM)
{
if (C==1 && !shortBlocks)
{
const int overlap = OVERLAP(mode);
clt_mdct_forward(&mode->mdct, in, out, mode->window, overlap, mode->maxLM-LM, 1);
} else {
const int overlap = OVERLAP(mode);
int N = mode->shortMdctSize<<LM;
int B = 1;
int b, c;
if (shortBlocks)
{
N = mode->shortMdctSize;
B = shortBlocks;
}
c=0; do {
for (b=0;b<B;b++)
{
/* Interleaving the sub-frames while doing the MDCTs */
clt_mdct_forward(&mode->mdct, in+c*(B*N+overlap)+b*N, &out[b+c*N*B], mode->window, overlap, shortBlocks ? mode->maxLM : mode->maxLM-LM, B);
}
} while (++c<C);
}
}
/** Compute the IMDCT and apply window for all sub-frames and
all channels in a frame */
static void compute_inv_mdcts(const CELTMode *mode, int shortBlocks, celt_sig *X,
celt_sig * OPUS_RESTRICT out_mem[],
celt_sig * OPUS_RESTRICT overlap_mem[], int C, int LM)
{
int c;
const int N = mode->shortMdctSize<<LM;
const int overlap = OVERLAP(mode);
VARDECL(opus_val32, x);
SAVE_STACK;
ALLOC(x, N+overlap, opus_val32);
c=0; do {
int j;
int b;
int N2 = N;
int B = 1;
if (shortBlocks)
{
N2 = mode->shortMdctSize;
B = shortBlocks;
}
/* Prevents problems from the imdct doing the overlap-add */
OPUS_CLEAR(x, overlap);
for (b=0;b<B;b++)
{
/* IMDCT on the interleaved the sub-frames */
clt_mdct_backward(&mode->mdct, &X[b+c*N2*B], x+N2*b, mode->window, overlap, shortBlocks ? mode->maxLM : mode->maxLM-LM, B);
}
for (j=0;j<overlap;j++)
out_mem[c][j] = x[j] + overlap_mem[c][j];
for (;j<N;j++)
out_mem[c][j] = x[j];
for (j=0;j<overlap;j++)
overlap_mem[c][j] = x[N+j];
} while (++c<C);
RESTORE_STACK;
}
static void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, int downsample, const opus_val16 *coef, celt_sig *mem)
{
int c;
int count=0;
c=0; do {
int j;
celt_sig * OPUS_RESTRICT x;
opus_val16 * OPUS_RESTRICT y;
celt_sig m = mem[c];
x =in[c];
y = pcm+c;
for (j=0;j<N;j++)
{
celt_sig tmp = *x + m;
m = MULT16_32_Q15(coef[0], tmp)
- MULT16_32_Q15(coef[1], *x);
tmp = SHL32(MULT16_32_Q15(coef[3], tmp), 2);
x++;
/* Technically the store could be moved outside of the if because
the stores we don't want will just be overwritten */
if (count==0)
*y = SCALEOUT(SIG2WORD16(tmp));
if (++count==downsample)
{
y+=C;
count=0;
}
}
mem[c] = m;
} while (++c<C);
}
static void comb_filter(opus_val32 *y, opus_val32 *x, int T0, int T1, int N,
opus_val16 g0, opus_val16 g1, int tapset0, int tapset1,
const opus_val16 *window, int overlap)
{
int i;
/* printf ("%d %d %f %f\n", T0, T1, g0, g1); */
opus_val16 g00, g01, g02, g10, g11, g12;
static const opus_val16 gains[3][3] = {
{QCONST16(0.3066406250f, 15), QCONST16(0.2170410156f, 15), QCONST16(0.1296386719f, 15)},
{QCONST16(0.4638671875f, 15), QCONST16(0.2680664062f, 15), QCONST16(0.f, 15)},
{QCONST16(0.7998046875f, 15), QCONST16(0.1000976562f, 15), QCONST16(0.f, 15)}};
g00 = MULT16_16_Q15(g0, gains[tapset0][0]);
g01 = MULT16_16_Q15(g0, gains[tapset0][1]);
g02 = MULT16_16_Q15(g0, gains[tapset0][2]);
g10 = MULT16_16_Q15(g1, gains[tapset1][0]);
g11 = MULT16_16_Q15(g1, gains[tapset1][1]);
g12 = MULT16_16_Q15(g1, gains[tapset1][2]);
for (i=0;i<overlap;i++)
{
opus_val16 f;
f = MULT16_16_Q15(window[i],window[i]);
y[i] = x[i]
+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g00),x[i-T0])
+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g01),x[i-T0-1])
+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g01),x[i-T0+1])
+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g02),x[i-T0-2])
+ MULT16_32_Q15(MULT16_16_Q15((Q15ONE-f),g02),x[i-T0+2])
+ MULT16_32_Q15(MULT16_16_Q15(f,g10),x[i-T1])
+ MULT16_32_Q15(MULT16_16_Q15(f,g11),x[i-T1-1])
+ MULT16_32_Q15(MULT16_16_Q15(f,g11),x[i-T1+1])
+ MULT16_32_Q15(MULT16_16_Q15(f,g12),x[i-T1-2])
+ MULT16_32_Q15(MULT16_16_Q15(f,g12),x[i-T1+2]);
}
for (i=overlap;i<N;i++)
y[i] = x[i]
+ MULT16_32_Q15(g10,x[i-T1])
+ MULT16_32_Q15(g11,x[i-T1-1])
+ MULT16_32_Q15(g11,x[i-T1+1])
+ MULT16_32_Q15(g12,x[i-T1-2])
+ MULT16_32_Q15(g12,x[i-T1+2]);
}
static const signed char tf_select_table[4][8] = {
{0, -1, 0, -1, 0,-1, 0,-1},
{0, -1, 0, -2, 1, 0, 1,-1},
{0, -2, 0, -3, 2, 0, 1,-1},
{0, -2, 0, -3, 3, 0, 1,-1},
};
static opus_val32 l1_metric(const celt_norm *tmp, int N, int LM, opus_val16 bias)
{
int i;
opus_val32 L1;
L1 = 0;
for (i=0;i<N;i++)
L1 += EXTEND32(ABS16(tmp[i]));
/* When in doubt, prefer good freq resolution */
L1 = MAC16_32_Q15(L1, LM*bias, L1);
return L1;
}
static int tf_analysis(const CELTMode *m, int len, int C, int isTransient,
int *tf_res, int nbCompressedBytes, celt_norm *X, int N0, int LM,
int *tf_sum, opus_val16 tf_estimate, int tf_chan)
{
int i;
VARDECL(int, metric);
int cost0;
int cost1;
VARDECL(int, path0);
VARDECL(int, path1);
VARDECL(celt_norm, tmp);
VARDECL(celt_norm, tmp_1);
int lambda;
int sel;
int selcost[2];
int tf_select=0;
opus_val16 bias;
SAVE_STACK;
bias = MULT16_16_Q14(QCONST16(.04f,15), MAX16(-QCONST16(.25f,14), QCONST16(1.5f,14)-tf_estimate));
/*printf("%f ", bias);*/
if (nbCompressedBytes<15*C)
{
*tf_sum = 0;
for (i=0;i<len;i++)
tf_res[i] = isTransient;
return 0;
}
if (nbCompressedBytes<40)
lambda = 12;
else if (nbCompressedBytes<60)
lambda = 6;
else if (nbCompressedBytes<100)
lambda = 4;
else
lambda = 3;
lambda*=2;
ALLOC(metric, len, int);
ALLOC(tmp, (m->eBands[len]-m->eBands[len-1])<<LM, celt_norm);
ALLOC(tmp_1, (m->eBands[len]-m->eBands[len-1])<<LM, celt_norm);
ALLOC(path0, len, int);
ALLOC(path1, len, int);
*tf_sum = 0;
for (i=0;i<len;i++)
{
int j, k, N;
int narrow;
opus_val32 L1, best_L1;
int best_level=0;
N = (m->eBands[i+1]-m->eBands[i])<<LM;
/* band is too narrow to be split down to LM=-1 */
narrow = (m->eBands[i+1]-m->eBands[i])==1;
for (j=0;j<N;j++)
tmp[j] = X[tf_chan*N0 + j+(m->eBands[i]<<LM)];
/* Just add the right channel if we're in stereo */
/*if (C==2)
for (j=0;j<N;j++)
tmp[j] = ADD16(SHR16(tmp[j], 1),SHR16(X[N0+j+(m->eBands[i]<<LM)], 1));*/
L1 = l1_metric(tmp, N, isTransient ? LM : 0, bias);
best_L1 = L1;
/* Check the -1 case for transients */
if (isTransient && !narrow)
{
for (j=0;j<N;j++)
tmp_1[j] = tmp[j];
haar1(tmp_1, N>>LM, 1<<LM);
L1 = l1_metric(tmp_1, N, LM+1, bias);
if (L1<best_L1)
{
best_L1 = L1;
best_level = -1;
}
}
/*printf ("%f ", L1);*/
for (k=0;k<LM+!(isTransient||narrow);k++)
{
int B;
if (isTransient)
B = (LM-k-1);
else
B = k+1;
haar1(tmp, N>>k, 1<<k);
L1 = l1_metric(tmp, N, B, bias);
if (L1 < best_L1)
{
best_L1 = L1;
best_level = k+1;
}
}
/*printf ("%d ", isTransient ? LM-best_level : best_level);*/
/* metric is in Q1 to be able to select the mid-point (-0.5) for narrower bands */
if (isTransient)
metric[i] = 2*best_level;
else
metric[i] = -2*best_level;
*tf_sum += (isTransient ? LM : 0) - metric[i]/2;
/* For bands that can't be split to -1, set the metric to the half-way point to avoid
biasing the decision */
if (narrow && (metric[i]==0 || metric[i]==-2*LM))
metric[i]-=1;
/*printf("%d ", metric[i]);*/
}
/*printf("\n");*/
/* Search for the optimal tf resolution, including tf_select */
tf_select = 0;
for (sel=0;sel<2;sel++)
{
cost0 = 0;
cost1 = isTransient ? 0 : lambda;
for (i=1;i<len;i++)
{
int curr0, curr1;
curr0 = IMIN(cost0, cost1 + lambda);
curr1 = IMIN(cost0 + lambda, cost1);
cost0 = curr0 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*sel+0]);
cost1 = curr1 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*sel+1]);
}
cost0 = IMIN(cost0, cost1);
selcost[sel]=cost0;
}
/* For now, we're conservative and only allow tf_select=1 for transients.
* If tests confirm it's useful for non-transients, we could allow it. */
if (selcost[1]<selcost[0] && isTransient)
tf_select=1;
cost0 = 0;
cost1 = isTransient ? 0 : lambda;
/* Viterbi forward pass */
for (i=1;i<len;i++)
{
int curr0, curr1;
int from0, from1;
from0 = cost0;
from1 = cost1 + lambda;
if (from0 < from1)
{
curr0 = from0;
path0[i]= 0;
} else {
curr0 = from1;
path0[i]= 1;
}
from0 = cost0 + lambda;
from1 = cost1;
if (from0 < from1)
{
curr1 = from0;
path1[i]= 0;
} else {
curr1 = from1;
path1[i]= 1;
}
cost0 = curr0 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*tf_select+0]);
cost1 = curr1 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*tf_select+1]);
}
tf_res[len-1] = cost0 < cost1 ? 0 : 1;
/* Viterbi backward pass to check the decisions */
for (i=len-2;i>=0;i--)
{
if (tf_res[i+1] == 1)
tf_res[i] = path1[i+1];
else
tf_res[i] = path0[i+1];
}
/*printf("%d %f\n", *tf_sum, tf_estimate);*/
RESTORE_STACK;
#ifdef FUZZING
tf_select = rand()&0x1;
tf_res[0] = rand()&0x1;
for (i=1;i<len;i++)
tf_res[i] = tf_res[i-1] ^ ((rand()&0xF) == 0);
#endif
return tf_select;
}
static void tf_encode(int start, int end, int isTransient, int *tf_res, int LM, int tf_select, ec_enc *enc)
{
int curr, i;
int tf_select_rsv;
int tf_changed;
int logp;
opus_uint32 budget;
opus_uint32 tell;
budget = enc->storage*8;
tell = ec_tell(enc);
logp = isTransient ? 2 : 4;
/* Reserve space to code the tf_select decision. */
tf_select_rsv = LM>0 && tell+logp+1 <= budget;
budget -= tf_select_rsv;
curr = tf_changed = 0;
for (i=start;i<end;i++)
{
if (tell+logp<=budget)
{
ec_enc_bit_logp(enc, tf_res[i] ^ curr, logp);
tell = ec_tell(enc);
curr = tf_res[i];
tf_changed |= curr;
}
else
tf_res[i] = curr;
logp = isTransient ? 4 : 5;
}
/* Only code tf_select if it would actually make a difference. */
if (tf_select_rsv &&
tf_select_table[LM][4*isTransient+0+tf_changed]!=
tf_select_table[LM][4*isTransient+2+tf_changed])
ec_enc_bit_logp(enc, tf_select, 1);
else
tf_select = 0;
for (i=start;i<end;i++)
tf_res[i] = tf_select_table[LM][4*isTransient+2*tf_select+tf_res[i]];
/*for(i=0;i<end;i++)printf("%d ", isTransient ? tf_res[i] : LM+tf_res[i]);printf("\n");*/
}
static void tf_decode(int start, int end, int isTransient, int *tf_res, int LM, ec_dec *dec)
{
int i, curr, tf_select;
int tf_select_rsv;
int tf_changed;
int logp;
opus_uint32 budget;
opus_uint32 tell;
budget = dec->storage*8;
tell = ec_tell(dec);
logp = isTransient ? 2 : 4;
tf_select_rsv = LM>0 && tell+logp+1<=budget;
budget -= tf_select_rsv;
tf_changed = curr = 0;
for (i=start;i<end;i++)
{
if (tell+logp<=budget)
{
curr ^= ec_dec_bit_logp(dec, logp);
tell = ec_tell(dec);
tf_changed |= curr;
}
tf_res[i] = curr;
logp = isTransient ? 4 : 5;
}
tf_select = 0;
if (tf_select_rsv &&
tf_select_table[LM][4*isTransient+0+tf_changed] !=
tf_select_table[LM][4*isTransient+2+tf_changed])
{
tf_select = ec_dec_bit_logp(dec, 1);
}
for (i=start;i<end;i++)
{
tf_res[i] = tf_select_table[LM][4*isTransient+2*tf_select+tf_res[i]];
}
}
static void init_caps(const CELTMode *m,int *cap,int LM,int C)
{
int i;
for (i=0;i<m->nbEBands;i++)
{
int N;
N=(m->eBands[i+1]-m->eBands[i])<<LM;
cap[i] = (m->cache.caps[m->nbEBands*(2*LM+C-1)+i]+64)*C*N>>2;
}
}
static int alloc_trim_analysis(const CELTMode *m, const celt_norm *X,
const opus_val16 *bandLogE, int end, int LM, int C, int N0,
AnalysisInfo *analysis, opus_val16 *stereo_saving, opus_val16 tf_estimate,
int intensity)
{
int i;
opus_val32 diff=0;
int c;
int trim_index = 5;
opus_val16 trim = QCONST16(5.f, 8);
opus_val16 logXC, logXC2;
if (C==2)
{
opus_val16 sum = 0; /* Q10 */
opus_val16 minXC; /* Q10 */
/* Compute inter-channel correlation for low frequencies */
for (i=0;i<8;i++)
{
int j;
opus_val32 partial = 0;
for (j=m->eBands[i]<<LM;j<m->eBands[i+1]<<LM;j++)
partial = MAC16_16(partial, X[j], X[N0+j]);
sum = ADD16(sum, EXTRACT16(SHR32(partial, 18)));
}
sum = MULT16_16_Q15(QCONST16(1.f/8, 15), sum);
sum = MIN16(QCONST16(1.f, 10), ABS16(sum));
minXC = sum;
for (i=8;i<intensity;i++)
{
int j;
opus_val32 partial = 0;
for (j=m->eBands[i]<<LM;j<m->eBands[i+1]<<LM;j++)
partial = MAC16_16(partial, X[j], X[N0+j]);
minXC = MIN16(minXC, ABS16(EXTRACT16(SHR32(partial, 18))));
}
minXC = MIN16(QCONST16(1.f, 10), ABS16(minXC));
/*printf ("%f\n", sum);*/
if (sum > QCONST16(.995f,10))
trim_index-=4;
else if (sum > QCONST16(.92f,10))
trim_index-=3;
else if (sum > QCONST16(.85f,10))
trim_index-=2;
else if (sum > QCONST16(.8f,10))
trim_index-=1;
/* mid-side savings estimations based on the LF average*/
logXC = celt_log2(QCONST32(1.001f, 20)-MULT16_16(sum, sum));
/* mid-side savings estimations based on min correlation */
logXC2 = MAX16(HALF16(logXC), celt_log2(QCONST32(1.001f, 20)-MULT16_16(minXC, minXC)));
#ifdef FIXED_POINT
/* Compensate for Q20 vs Q14 input and convert output to Q8 */
logXC = PSHR32(logXC-QCONST16(6.f, DB_SHIFT),DB_SHIFT-8);
logXC2 = PSHR32(logXC2-QCONST16(6.f, DB_SHIFT),DB_SHIFT-8);
#endif
trim += MAX16(-QCONST16(4.f, 8), MULT16_16_Q15(QCONST16(.75f,15),logXC));
*stereo_saving = MIN16(*stereo_saving + QCONST16(0.25f, 8), -HALF16(logXC2));
}
/* Estimate spectral tilt */
c=0; do {
for (i=0;i<end-1;i++)
{
diff += bandLogE[i+c*m->nbEBands]*(opus_int32)(2+2*i-end);
}
} while (++c<C);
diff /= C*(end-1);
/*printf("%f\n", diff);*/
if (diff > QCONST16(2.f, DB_SHIFT))
trim_index--;
if (diff > QCONST16(8.f, DB_SHIFT))
trim_index--;
if (diff < -QCONST16(4.f, DB_SHIFT))
trim_index++;
if (diff < -QCONST16(10.f, DB_SHIFT))
trim_index++;
trim -= MAX16(-QCONST16(2.f, 8), MIN16(QCONST16(2.f, 8), SHR16(diff+QCONST16(1.f, DB_SHIFT),DB_SHIFT-8)/6 ));
trim -= 2*SHR16(tf_estimate-QCONST16(1.f,14), 14-8);
#ifndef FIXED_POINT
if (analysis->valid)
{
trim -= MAX16(-QCONST16(2.f, 8), MIN16(QCONST16(2.f, 8), 2*(analysis->tonality_slope+.05)));
}
#endif
#ifdef FIXED_POINT
trim_index = PSHR32(trim, 8);
#else
trim_index = floor(.5+trim);
#endif
if (trim_index<0)
trim_index = 0;
if (trim_index>10)
trim_index = 10;
/*printf("%d\n", trim_index);*/
#ifdef FUZZING
trim_index = rand()%11;
#endif
return trim_index;
}
static int stereo_analysis(const CELTMode *m, const celt_norm *X,
int LM, int N0)
{
int i;
int thetas;
opus_val32 sumLR = EPSILON, sumMS = EPSILON;
/* Use the L1 norm to model the entropy of the L/R signal vs the M/S signal */
for (i=0;i<13;i++)
{
int j;
for (j=m->eBands[i]<<LM;j<m->eBands[i+1]<<LM;j++)
{
opus_val32 L, R, M, S;
/* We cast to 32-bit first because of the -32768 case */
L = EXTEND32(X[j]);
R = EXTEND32(X[N0+j]);
M = ADD32(L, R);
S = SUB32(L, R);
sumLR = ADD32(sumLR, ADD32(ABS32(L), ABS32(R)));
sumMS = ADD32(sumMS, ADD32(ABS32(M), ABS32(S)));
}
}
sumMS = MULT16_32_Q15(QCONST16(0.707107f, 15), sumMS);
thetas = 13;
/* We don't need thetas for lower bands with LM<=1 */
if (LM<=1)
thetas -= 8;
return MULT16_32_Q15((m->eBands[13]<<(LM+1))+thetas, sumMS)
> MULT16_32_Q15(m->eBands[13]<<(LM+1), sumLR);
}
int celt_encode_with_ec(CELTEncoder * OPUS_RESTRICT st, const opus_val16 * pcm, int frame_size, unsigned char *compressed, int nbCompressedBytes, ec_enc *enc)
{
int i, c, N;
opus_int32 bits;
ec_enc _enc;
VARDECL(celt_sig, in);
VARDECL(celt_sig, freq);
VARDECL(celt_norm, X);
VARDECL(celt_ener, bandE);
VARDECL(opus_val16, bandLogE);
VARDECL(opus_val16, bandLogE2);
VARDECL(int, fine_quant);
VARDECL(opus_val16, error);
VARDECL(int, pulses);
VARDECL(int, cap);
VARDECL(int, offsets);
VARDECL(int, fine_priority);
VARDECL(int, tf_res);
VARDECL(unsigned char, collapse_masks);
celt_sig *prefilter_mem;
opus_val16 *oldBandE, *oldLogE, *oldLogE2;
int shortBlocks=0;
int isTransient=0;
const int CC = st->channels;
const int C = st->stream_channels;
int LM, M;
int tf_select;
int nbFilledBytes, nbAvailableBytes;
int effEnd;
int codedBands;
int tf_sum;
int alloc_trim;
int pitch_index=COMBFILTER_MINPERIOD;
opus_val16 gain1 = 0;
int dual_stereo=0;
int effectiveBytes;
opus_val16 pf_threshold;
int dynalloc_logp;
opus_int32 vbr_rate;
opus_int32 total_bits;
opus_int32 total_boost;
opus_int32 balance;
opus_int32 tell;
int prefilter_tapset=0;
int pf_on;
int anti_collapse_rsv;
int anti_collapse_on=0;
int silence=0;
int tf_chan = 0;
opus_val16 tf_estimate;
int pitch_change=0;
opus_int32 tot_boost=0;
opus_val16 sample_max;
opus_val16 maxDepth;
ALLOC_STACK;
tf_estimate = QCONST16(1.0f,14);
if (nbCompressedBytes<2 || pcm==NULL)
return OPUS_BAD_ARG;
frame_size *= st->upsample;
for (LM=0;LM<=st->mode->maxLM;LM++)
if (st->mode->shortMdctSize<<LM==frame_size)
break;
if (LM>st->mode->maxLM)
return OPUS_BAD_ARG;
M=1<<LM;
N = M*st->mode->shortMdctSize;
prefilter_mem = st->in_mem+CC*(st->overlap);
oldBandE = (opus_val16*)(st->in_mem+CC*(st->overlap+COMBFILTER_MAXPERIOD));
oldLogE = oldBandE + CC*st->mode->nbEBands;
oldLogE2 = oldLogE + CC*st->mode->nbEBands;
if (enc==NULL)
{
tell=1;
nbFilledBytes=0;
} else {
tell=ec_tell(enc);
nbFilledBytes=(tell+4)>>3;
}
#ifdef CUSTOM_MODES
if (st->signalling && enc==NULL)
{
int tmp = (st->mode->effEBands-st->end)>>1;
st->end = IMAX(1, st->mode->effEBands-tmp);
compressed[0] = tmp<<5;
compressed[0] |= LM<<3;
compressed[0] |= (C==2)<<2;
/* Convert "standard mode" to Opus header */
if (st->mode->Fs==48000 && st->mode->shortMdctSize==120)
{
int c0 = toOpus(compressed[0]);
if (c0<0)
return OPUS_BAD_ARG;
compressed[0] = c0;
}
compressed++;
nbCompressedBytes--;
}
#else
celt_assert(st->signalling==0);
#endif
/* Can't produce more than 1275 output bytes */
nbCompressedBytes = IMIN(nbCompressedBytes,1275);
nbAvailableBytes = nbCompressedBytes - nbFilledBytes;
if (st->vbr && st->bitrate!=OPUS_BITRATE_MAX)
{
opus_int32 den=st->mode->Fs>>BITRES;
vbr_rate=(st->bitrate*frame_size+(den>>1))/den;
#ifdef CUSTOM_MODES
if (st->signalling)
vbr_rate -= 8<<BITRES;
#endif
effectiveBytes = vbr_rate>>(3+BITRES);
} else {
opus_int32 tmp;
vbr_rate = 0;
tmp = st->bitrate*frame_size;
if (tell>1)
tmp += tell;
if (st->bitrate!=OPUS_BITRATE_MAX)
nbCompressedBytes = IMAX(2, IMIN(nbCompressedBytes,
(tmp+4*st->mode->Fs)/(8*st->mode->Fs)-!!st->signalling));
effectiveBytes = nbCompressedBytes;
}
if (enc==NULL)
{
ec_enc_init(&_enc, compressed, nbCompressedBytes);
enc = &_enc;
}
if (vbr_rate>0)
{
/* Computes the max bit-rate allowed in VBR mode to avoid violating the
target rate and buffering.
We must do this up front so that bust-prevention logic triggers
correctly if we don't have enough bits. */
if (st->constrained_vbr)
{
opus_int32 vbr_bound;
opus_int32 max_allowed;
/* We could use any multiple of vbr_rate as bound (depending on the
delay).
This is clamped to ensure we use at least two bytes if the encoder
was entirely empty, but to allow 0 in hybrid mode. */
vbr_bound = vbr_rate;
max_allowed = IMIN(IMAX(tell==1?2:0,
(vbr_rate+vbr_bound-st->vbr_reservoir)>>(BITRES+3)),
nbAvailableBytes);
if(max_allowed < nbAvailableBytes)
{
nbCompressedBytes = nbFilledBytes+max_allowed;
nbAvailableBytes = max_allowed;
ec_enc_shrink(enc, nbCompressedBytes);
}
}
}
total_bits = nbCompressedBytes*8;
effEnd = st->end;
if (effEnd > st->mode->effEBands)
effEnd = st->mode->effEBands;
ALLOC(in, CC*(N+st->overlap), celt_sig);
sample_max=MAX16(st->overlap_max, celt_maxabs16(pcm, C*(N-st->mode->overlap)/st->upsample));
st->overlap_max=celt_maxabs16(pcm+C*(N-st->mode->overlap)/st->upsample, C*st->mode->overlap/st->upsample);
sample_max=MAX16(sample_max, st->overlap_max);
/* Find pitch period and gain */
{
VARDECL(celt_sig, _pre);
celt_sig *pre[2];
SAVE_STACK;
ALLOC(_pre, CC*(N+COMBFILTER_MAXPERIOD), celt_sig);
pre[0] = _pre;
pre[1] = _pre + (N+COMBFILTER_MAXPERIOD);
silence = 1;
c=0; do {
int count = 0;
const opus_val16 * OPUS_RESTRICT pcmp = pcm+c;
celt_sig * OPUS_RESTRICT inp = in+c*(N+st->overlap)+st->overlap;
for (i=0;i<N;i++)
{
celt_sig x, tmp;
x = SCALEIN(*pcmp);
#ifndef FIXED_POINT
if (!(x==x))
x = 0;
if (st->clip)
x = MAX32(-65536.f, MIN32(65536.f,x));
#endif
if (++count==st->upsample)
{
count=0;
pcmp+=CC;
} else {
x = 0;
}
/* Apply pre-emphasis */
tmp = MULT16_16(st->mode->preemph[2], x);
*inp = tmp + st->preemph_memE[c];
st->preemph_memE[c] = MULT16_32_Q15(st->mode->preemph[1], *inp)
- MULT16_32_Q15(st->mode->preemph[0], tmp);
inp++;
}
OPUS_COPY(pre[c], prefilter_mem+c*COMBFILTER_MAXPERIOD, COMBFILTER_MAXPERIOD);
OPUS_COPY(pre[c]+COMBFILTER_MAXPERIOD, in+c*(N+st->overlap)+st->overlap, N);
} while (++c<CC);
#ifdef FIXED_POINT
silence = (sample_max==0);
#else
silence = (sample_max <= (opus_val16)1/(1<<st->lsb_depth));
#endif
#ifdef FUZZING
if ((rand()&0x3F)==0)
silence = 1;
#endif
if (tell==1)
ec_enc_bit_logp(enc, silence, 15);
else
silence=0;
if (silence)
{
/*In VBR mode there is no need to send more than the minimum. */
if (vbr_rate>0)
{
effectiveBytes=nbCompressedBytes=IMIN(nbCompressedBytes, nbFilledBytes+2);
total_bits=nbCompressedBytes*8;
nbAvailableBytes=2;
ec_enc_shrink(enc, nbCompressedBytes);
}
/* Pretend we've filled all the remaining bits with zeros
(that's what the initialiser did anyway) */
tell = nbCompressedBytes*8;
enc->nbits_total+=tell-ec_tell(enc);
}
if (nbAvailableBytes>12*C && st->start==0 && !silence && !st->disable_pf && st->complexity >= 5)
{
VARDECL(opus_val16, pitch_buf);
ALLOC(pitch_buf, (COMBFILTER_MAXPERIOD+N)>>1, opus_val16);
pitch_downsample(pre, pitch_buf, COMBFILTER_MAXPERIOD+N, CC);
/* Don't search for the fir last 1.5 octave of the range because
there's too many false-positives due to short-term correlation */
pitch_search(pitch_buf+(COMBFILTER_MAXPERIOD>>1), pitch_buf, N,
COMBFILTER_MAXPERIOD-3*COMBFILTER_MINPERIOD, &pitch_index);
pitch_index = COMBFILTER_MAXPERIOD-pitch_index;
gain1 = remove_doubling(pitch_buf, COMBFILTER_MAXPERIOD, COMBFILTER_MINPERIOD,
N, &pitch_index, st->prefilter_period, st->prefilter_gain);
if (pitch_index > COMBFILTER_MAXPERIOD-2)
pitch_index = COMBFILTER_MAXPERIOD-2;
gain1 = MULT16_16_Q15(QCONST16(.7f,15),gain1);
if ((gain1 > QCONST16(.4f,15) || st->prefilter_gain > QCONST16(.4f,15)) && st->analysis.tonality > .3
&& (pitch_index > 1.26*st->prefilter_period || pitch_index < .79*st->prefilter_period))
pitch_change = 1;
/*printf("%d %d %f %f\n", pitch_change, pitch_index, gain1, st->analysis.tonality);*/
if (st->loss_rate>2)
gain1 = HALF32(gain1);
if (st->loss_rate>4)
gain1 = HALF32(gain1);
if (st->loss_rate>8)
gain1 = 0;
prefilter_tapset = st->tapset_decision;
} else {
gain1 = 0;
}
/* Gain threshold for enabling the prefilter/postfilter */
pf_threshold = QCONST16(.2f,15);
/* Adjusting the threshold based on rate and continuity */
if (abs(pitch_index-st->prefilter_period)*10>pitch_index)
pf_threshold += QCONST16(.2f,15);
if (nbAvailableBytes<25)
pf_threshold += QCONST16(.1f,15);
if (nbAvailableBytes<35)
pf_threshold += QCONST16(.1f,15);
if (st->prefilter_gain > QCONST16(.4f,15))
pf_threshold -= QCONST16(.1f,15);
if (st->prefilter_gain > QCONST16(.55f,15))
pf_threshold -= QCONST16(.1f,15);
/* Hard threshold at 0.2 */
pf_threshold = MAX16(pf_threshold, QCONST16(.2f,15));
if (gain1<pf_threshold)
{
if(st->start==0 && tell+16<=total_bits)
ec_enc_bit_logp(enc, 0, 1);
gain1 = 0;
pf_on = 0;
} else {
/*This block is not gated by a total bits check only because
of the nbAvailableBytes check above.*/
int qg;
int octave;
if (ABS16(gain1-st->prefilter_gain)<QCONST16(.1f,15))
gain1=st->prefilter_gain;
#ifdef FIXED_POINT
qg = ((gain1+1536)>>10)/3-1;
#else
qg = (int)floor(.5f+gain1*32/3)-1;
#endif
qg = IMAX(0, IMIN(7, qg));
ec_enc_bit_logp(enc, 1, 1);
pitch_index += 1;
octave = EC_ILOG(pitch_index)-5;
ec_enc_uint(enc, octave, 6);
ec_enc_bits(enc, pitch_index-(16<<octave), 4+octave);
pitch_index -= 1;
ec_enc_bits(enc, qg, 3);
if (ec_tell(enc)+2<=total_bits)
ec_enc_icdf(enc, prefilter_tapset, tapset_icdf, 2);
else
prefilter_tapset = 0;
gain1 = QCONST16(0.09375f,15)*(qg+1);
pf_on = 1;
}
/*printf("%d %f\n", pitch_index, gain1);*/
c=0; do {
int offset = st->mode->shortMdctSize-st->mode->overlap;
st->prefilter_period=IMAX(st->prefilter_period, COMBFILTER_MINPERIOD);
OPUS_COPY(in+c*(N+st->overlap), st->in_mem+c*(st->overlap), st->overlap);
if (offset)
comb_filter(in+c*(N+st->overlap)+st->overlap, pre[c]+COMBFILTER_MAXPERIOD,
st->prefilter_period, st->prefilter_period, offset, -st->prefilter_gain, -st->prefilter_gain,
st->prefilter_tapset, st->prefilter_tapset, NULL, 0);
comb_filter(in+c*(N+st->overlap)+st->overlap+offset, pre[c]+COMBFILTER_MAXPERIOD+offset,
st->prefilter_period, pitch_index, N-offset, -st->prefilter_gain, -gain1,
st->prefilter_tapset, prefilter_tapset, st->mode->window, st->mode->overlap);
OPUS_COPY(st->in_mem+c*(st->overlap), in+c*(N+st->overlap)+N, st->overlap);
if (N>COMBFILTER_MAXPERIOD)
{
OPUS_MOVE(prefilter_mem+c*COMBFILTER_MAXPERIOD, pre[c]+N, COMBFILTER_MAXPERIOD);
} else {
OPUS_MOVE(prefilter_mem+c*COMBFILTER_MAXPERIOD, prefilter_mem+c*COMBFILTER_MAXPERIOD+N, COMBFILTER_MAXPERIOD-N);
OPUS_MOVE(prefilter_mem+c*COMBFILTER_MAXPERIOD+COMBFILTER_MAXPERIOD-N, pre[c]+COMBFILTER_MAXPERIOD, N);
}
} while (++c<CC);
RESTORE_STACK;
}
isTransient = 0;
shortBlocks = 0;
if (LM>0 && ec_tell(enc)+3<=total_bits)
{
if (st->complexity > 1)
{
isTransient = transient_analysis(in, N+st->overlap, CC,
st->overlap, &tf_estimate, &tf_chan, &st->analysis);
if (isTransient)
shortBlocks = M;
}
ec_enc_bit_logp(enc, isTransient, 3);
}
ALLOC(freq, CC*N, celt_sig); /**< Interleaved signal MDCTs */
ALLOC(bandE,st->mode->nbEBands*CC, celt_ener);
ALLOC(bandLogE,st->mode->nbEBands*CC, opus_val16);
/* Compute MDCTs */
compute_mdcts(st->mode, shortBlocks, in, freq, CC, LM);
if (CC==2&&C==1)
{
for (i=0;i<N;i++)
freq[i] = ADD32(HALF32(freq[i]), HALF32(freq[N+i]));
tf_chan = 0;
}
if (st->upsample != 1)
{
c=0; do
{
int bound = N/st->upsample;
for (i=0;i<bound;i++)
freq[c*N+i] *= st->upsample;
for (;i<N;i++)
freq[c*N+i] = 0;
} while (++c<C);
}
compute_band_energies(st->mode, freq, bandE, effEnd, C, M);
amp2Log2(st->mode, effEnd, st->end, bandE, bandLogE, C);
/*for (i=0;i<21;i++)
printf("%f ", bandLogE[i]);
printf("\n");*/
ALLOC(bandLogE2, C*st->mode->nbEBands, opus_val16);
if (shortBlocks && st->complexity>=8)
{
VARDECL(celt_sig, freq2);
VARDECL(opus_val32, bandE2);
ALLOC(freq2, CC*N, celt_sig);
compute_mdcts(st->mode, 0, in, freq2, CC, LM);
if (CC==2&&C==1)
{
for (i=0;i<N;i++)
freq2[i] = ADD32(HALF32(freq2[i]), HALF32(freq2[N+i]));
}
if (st->upsample != 1)
{
c=0; do
{
int bound = N/st->upsample;
for (i=0;i<bound;i++)
freq2[c*N+i] *= st->upsample;
for (;i<N;i++)
freq2[c*N+i] = 0;
} while (++c<C);
}
ALLOC(bandE2, C*st->mode->nbEBands, opus_val32);
compute_band_energies(st->mode, freq2, bandE2, effEnd, C, M);
amp2Log2(st->mode, effEnd, st->end, bandE2, bandLogE2, C);
for (i=0;i<C*st->mode->nbEBands;i++)
bandLogE2[i] += HALF16(SHL16(LM, DB_SHIFT));
} else {
for (i=0;i<C*st->mode->nbEBands;i++)
bandLogE2[i] = bandLogE[i];
}
ALLOC(X, C*N, celt_norm); /**< Interleaved normalised MDCTs */
/* Band normalisation */
normalise_bands(st->mode, freq, X, bandE, effEnd, C, M);
ALLOC(tf_res, st->mode->nbEBands, int);
tf_select = tf_analysis(st->mode, effEnd, C, isTransient, tf_res, effectiveBytes, X, N, LM, &tf_sum, tf_estimate, tf_chan);
for (i=effEnd;i<st->end;i++)
tf_res[i] = tf_res[effEnd-1];
ALLOC(error, C*st->mode->nbEBands, opus_val16);
quant_coarse_energy(st->mode, st->start, st->end, effEnd, bandLogE,
oldBandE, total_bits, error, enc,
C, LM, nbAvailableBytes, st->force_intra,
&st->delayedIntra, st->complexity >= 4, st->loss_rate);
tf_encode(st->start, st->end, isTransient, tf_res, LM, tf_select, enc);
if (ec_tell(enc)+4<=total_bits)
{
if (shortBlocks || st->complexity < 3 || nbAvailableBytes < 10*C)
{
if (st->complexity == 0)
st->spread_decision = SPREAD_NONE;
} else {
if (st->analysis.valid)
{
static const opus_val16 spread_thresholds[3] = {-QCONST16(.6f, 15), -QCONST16(.2f, 15), -QCONST16(.07f, 15)};
static const opus_val16 spread_histeresis[3] = {QCONST16(.15f, 15), QCONST16(.07f, 15), QCONST16(.02f, 15)};
static const opus_val16 tapset_thresholds[2] = {QCONST16(.0f, 15), QCONST16(.15f, 15)};
static const opus_val16 tapset_histeresis[2] = {QCONST16(.1f, 15), QCONST16(.05f, 15)};
st->spread_decision = hysteresis_decision(-st->analysis.tonality, spread_thresholds, spread_histeresis, 3, st->spread_decision);
st->tapset_decision = hysteresis_decision(st->analysis.tonality_slope, tapset_thresholds, tapset_histeresis, 2, st->tapset_decision);
} else {
st->spread_decision = spreading_decision(st->mode, X,
&st->tonal_average, st->spread_decision, &st->hf_average,
&st->tapset_decision, pf_on&&!shortBlocks, effEnd, C, M);
}
/*printf("%d %d\n", st->tapset_decision, st->spread_decision);*/
/*printf("%f %d %f %d\n\n", st->analysis.tonality, st->spread_decision, st->analysis.tonality_slope, st->tapset_decision);*/
}
ec_enc_icdf(enc, st->spread_decision, spread_icdf, 5);
}
ALLOC(cap, st->mode->nbEBands, int);
ALLOC(offsets, st->mode->nbEBands, int);
init_caps(st->mode,cap,LM,C);
for (i=0;i<st->mode->nbEBands;i++)
offsets[i] = 0;
/* Dynamic allocation code */
maxDepth=-QCONST16(32.f, DB_SHIFT);
/* Make sure that dynamic allocation can't make us bust the budget */
if (effectiveBytes > 50 && LM>=1)
{
int last=0;
VARDECL(opus_val16, follower);
ALLOC(follower, C*st->mode->nbEBands, opus_val16);
c=0;do
{
follower[c*st->mode->nbEBands] = bandLogE2[c*st->mode->nbEBands];
for (i=1;i<st->end;i++)
{
/* The last band to be at least 3 dB higher than the previous one
is the last we'll consider. Otherwise, we run into problems on
bandlimited signals. */
if (bandLogE2[c*st->mode->nbEBands+i] > bandLogE2[c*st->mode->nbEBands+i-1]+QCONST16(.5f,DB_SHIFT))
last=i;
follower[c*st->mode->nbEBands+i] = MIN16(follower[c*st->mode->nbEBands+i-1]+QCONST16(1.5f,DB_SHIFT), bandLogE2[c*st->mode->nbEBands+i]);
}
for (i=last-1;i>=0;i--)
follower[c*st->mode->nbEBands+i] = MIN16(follower[c*st->mode->nbEBands+i], MIN16(follower[c*st->mode->nbEBands+i+1]+QCONST16(2.f,DB_SHIFT), bandLogE2[c*st->mode->nbEBands+i]));
for (i=0;i<st->end;i++)
{
opus_val16 noise_floor;
/* Noise floor must take into account eMeans, the depth, the width of the bands
and the preemphasis filter (approx. square of bark band ID) */
noise_floor = MULT16_16(QCONST16(0.0625f, DB_SHIFT),st->mode->logN[i])
+QCONST16(.5f,DB_SHIFT)+SHL16(9-st->lsb_depth,DB_SHIFT)-SHL16(eMeans[i],6)
+MULT16_16(QCONST16(.0062,DB_SHIFT),(i+5)*(i+5));
follower[c*st->mode->nbEBands+i] = MAX16(follower[c*st->mode->nbEBands+i], noise_floor);
maxDepth = MAX16(maxDepth, bandLogE[c*st->mode->nbEBands+i]-noise_floor);
}
} while (++c<C);
if (C==2)
{
for (i=st->start;i<st->end;i++)
{
/* Consider 24 dB "cross-talk" */
follower[st->mode->nbEBands+i] = MAX16(follower[st->mode->nbEBands+i], follower[ i]-QCONST16(4.f,DB_SHIFT));
follower[ i] = MAX16(follower[ i], follower[st->mode->nbEBands+i]-QCONST16(4.f,DB_SHIFT));
follower[i] = HALF16(MAX16(0, bandLogE[i]-follower[i]) + MAX16(0, bandLogE[st->mode->nbEBands+i]-follower[st->mode->nbEBands+i]));
}
} else {
for (i=st->start;i<st->end;i++)
{
follower[i] = MAX16(0, bandLogE[i]-follower[i]);
}
}
/* For non-transient CBR/CVBR frames, halve the dynalloc contribution */
if ((!st->vbr || st->constrained_vbr)&&!isTransient)
{
for (i=st->start;i<st->end;i++)
follower[i] = HALF16(follower[i]);
}
for (i=st->start;i<st->end;i++)
{
int width;
int boost;
int boost_bits;
if (i<8)
follower[i] *= 2;
if (i>=12)
follower[i] = HALF16(follower[i]);
follower[i] = MIN16(follower[i], QCONST16(4, DB_SHIFT));
/* FIXME: Adaptively reduce follower at low rate or for cbr/cvbr */
width = C*(st->mode->eBands[i+1]-st->mode->eBands[i])<<LM;
if (width<6)
{
boost = SHR32(EXTEND32(follower[i]),DB_SHIFT);
boost_bits = boost*width<<BITRES;
} else if (width > 48) {
boost = SHR32(EXTEND32(follower[i])*8,DB_SHIFT);
boost_bits = (boost*width<<BITRES)/8;
} else {
boost = SHR32(EXTEND32(follower[i])*width/6,DB_SHIFT);
boost_bits = boost*6<<BITRES;
}
/* For CBR and non-transient CVBR frames, limit dynalloc to 1/4 of the bits */
if ((!st->vbr || (st->constrained_vbr&&!isTransient))
&& (tot_boost+boost_bits)>>BITRES>>3 > effectiveBytes/4)
{
offsets[i] = 0;
break;
} else {
offsets[i] = boost;
tot_boost += boost_bits;
}
}
}
dynalloc_logp = 6;
total_bits<<=BITRES;
total_boost = 0;
tell = ec_tell_frac(enc);
for (i=st->start;i<st->end;i++)
{
int width, quanta;
int dynalloc_loop_logp;
int boost;
int j;
width = C*(st->mode->eBands[i+1]-st->mode->eBands[i])<<LM;
/* quanta is 6 bits, but no more than 1 bit/sample
and no less than 1/8 bit/sample */
quanta = IMIN(width<<BITRES, IMAX(6<<BITRES, width));
dynalloc_loop_logp = dynalloc_logp;
boost = 0;
for (j = 0; tell+(dynalloc_loop_logp<<BITRES) < total_bits-total_boost
&& boost < cap[i]; j++)
{
int flag;
flag = j<offsets[i];
ec_enc_bit_logp(enc, flag, dynalloc_loop_logp);
tell = ec_tell_frac(enc);
if (!flag)
break;
boost += quanta;
total_boost += quanta;
dynalloc_loop_logp = 1;
}
/* Making dynalloc more likely */
if (j)
dynalloc_logp = IMAX(2, dynalloc_logp-1);
offsets[i] = boost;
}
if (C==2)
{
int effectiveRate;
static const opus_val16 intensity_thresholds[21]=
/* 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 off*/
{ 16,21,23,25,27,29,31,33,35,38,42,46,50,54,58,63,68,75,84,102,130};
static const opus_val16 intensity_histeresis[21]=
{ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 4, 5, 6, 8, 12};
/* Always use MS for 2.5 ms frames until we can do a better analysis */
if (LM!=0)
dual_stereo = stereo_analysis(st->mode, X, LM, N);
/* Account for coarse energy */
effectiveRate = (8*effectiveBytes - 80)>>LM;
/* effectiveRate in kb/s */
effectiveRate = 2*effectiveRate/5;
st->intensity = hysteresis_decision(effectiveRate, intensity_thresholds, intensity_histeresis, 21, st->intensity);
st->intensity = IMIN(st->end,IMAX(st->start, st->intensity));
}
alloc_trim = 5;
if (tell+(6<<BITRES) <= total_bits - total_boost)
{
alloc_trim = alloc_trim_analysis(st->mode, X, bandLogE,
st->end, LM, C, N, &st->analysis, &st->stereo_saving, tf_estimate, st->intensity);
ec_enc_icdf(enc, alloc_trim, trim_icdf, 7);
tell = ec_tell_frac(enc);
}
/* Variable bitrate */
if (vbr_rate>0)
{
opus_val16 alpha;
opus_int32 delta;
/* The target rate in 8th bits per frame */
opus_int32 target, base_target;
opus_int32 min_allowed;
int coded_bins;
int coded_bands;
int lm_diff = st->mode->maxLM - LM;
coded_bands = st->lastCodedBands ? st->lastCodedBands : st->mode->nbEBands;
coded_bins = st->mode->eBands[coded_bands]<<LM;
if (C==2)
coded_bins += st->mode->eBands[IMIN(st->intensity, coded_bands)]<<LM;
/* Don't attempt to use more than 510 kb/s, even for frames smaller than 20 ms.
The CELT allocator will just not be able to use more than that anyway. */
nbCompressedBytes = IMIN(nbCompressedBytes,1275>>(3-LM));
target = vbr_rate - ((40*C+20)<<BITRES);
base_target = target;
if (st->constrained_vbr)
target += (st->vbr_offset>>lm_diff);
/*printf("%f %f %f %f %d %d ", st->analysis.activity, st->analysis.tonality, tf_estimate, st->stereo_saving, tot_boost, coded_bands);*/
#ifndef FIXED_POINT
if (st->analysis.valid && st->analysis.activity<.4)
target -= (coded_bins<<BITRES)*1*(.4-st->analysis.activity);
#endif
/* Stereo savings */
if (C==2)
{
int coded_stereo_bands;
int coded_stereo_dof;
coded_stereo_bands = IMIN(st->intensity, coded_bands);
coded_stereo_dof = (st->mode->eBands[coded_stereo_bands]<<LM)-coded_stereo_bands;
/*printf("%d %d %d ", coded_stereo_dof, coded_bins, tot_boost);*/
target -= MIN32(target/3, SHR16(MULT16_16(st->stereo_saving,(coded_stereo_dof<<BITRES)),8));
target += MULT16_16_Q15(QCONST16(0.035,15),coded_stereo_dof<<BITRES);
}
/* Limits starving of other bands when using dynalloc */
target += tot_boost;
/* Compensates for the average transient boost */
target = MULT16_32_Q15(QCONST16(0.96f,15),target);
/* Apply transient boost */
target = SHL32(MULT16_32_Q15(tf_estimate, target),1);
#ifndef FIXED_POINT
/* Apply tonality boost */
if (st->analysis.valid) {
int tonal_target;
float tonal;
/* Compensates for the average tonality boost */
target -= MULT16_16_Q15(QCONST16(0.13f,15),coded_bins<<BITRES);
tonal = MAX16(0,st->analysis.tonality-.2);
tonal_target = target + (coded_bins<<BITRES)*2.0f*tonal;
if (pitch_change)
tonal_target += (coded_bins<<BITRES)*.8;
/*printf("%f %f ", st->analysis.tonality, tonal);*/
target = IMAX(tonal_target,target);
}
#endif
{
opus_int32 floor_depth;
int bins;
bins = st->mode->eBands[st->mode->nbEBands-2]<<LM;
/*floor_depth = SHR32(MULT16_16((C*bins<<BITRES),celt_log2(SHL32(MAX16(1,sample_max),13))), DB_SHIFT);*/
floor_depth = SHR32(MULT16_16((C*bins<<BITRES),maxDepth), DB_SHIFT);
floor_depth = IMAX(floor_depth, target>>2);
target = IMIN(target, floor_depth);
/*printf("%f %d\n", maxDepth, floor_depth);*/
}
if (st->constrained_vbr || st->bitrate<64000)
{
opus_val16 rate_factor;
#ifdef FIXED_POINT
rate_factor = MAX16(0,(st->bitrate-32000));
#else
rate_factor = MAX16(0,(1.f/32768)*(st->bitrate-32000));
#endif
if (st->constrained_vbr)
rate_factor = MIN16(rate_factor, QCONST16(0.67f, 15));
target = base_target + MULT16_32_Q15(rate_factor, target-base_target);
}
/* Don't allow more than doubling the rate */
target = IMIN(2*base_target, target);
/* The current offset is removed from the target and the space used
so far is added*/
target=target+tell;
/* In VBR mode the frame size must not be reduced so much that it would
result in the encoder running out of bits.
The margin of 2 bytes ensures that none of the bust-prevention logic
in the decoder will have triggered so far. */
min_allowed = ((tell+total_boost+(1<<(BITRES+3))-1)>>(BITRES+3)) + 2 - nbFilledBytes;
nbAvailableBytes = (target+(1<<(BITRES+2)))>>(BITRES+3);
nbAvailableBytes = IMAX(min_allowed,nbAvailableBytes);
nbAvailableBytes = IMIN(nbCompressedBytes,nbAvailableBytes+nbFilledBytes) - nbFilledBytes;
/* By how much did we "miss" the target on that frame */
delta = target - vbr_rate;
target=nbAvailableBytes<<(BITRES+3);
/*If the frame is silent we don't adjust our drift, otherwise
the encoder will shoot to very high rates after hitting a
span of silence, but we do allow the bitres to refill.
This means that we'll undershoot our target in CVBR/VBR modes
on files with lots of silence. */
if(silence)
{
nbAvailableBytes = 2;
target = 2*8<<BITRES;
delta = 0;
}
if (st->vbr_count < 970)
{
st->vbr_count++;
alpha = celt_rcp(SHL32(EXTEND32(st->vbr_count+20),16));
} else
alpha = QCONST16(.001f,15);
/* How many bits have we used in excess of what we're allowed */
if (st->constrained_vbr)
st->vbr_reservoir += target - vbr_rate;
/*printf ("%d\n", st->vbr_reservoir);*/
/* Compute the offset we need to apply in order to reach the target */
if (st->constrained_vbr)
{
st->vbr_drift += (opus_int32)MULT16_32_Q15(alpha,(delta*(1<<lm_diff))-st->vbr_offset-st->vbr_drift);
st->vbr_offset = -st->vbr_drift;
}
/*printf ("%d\n", st->vbr_drift);*/
if (st->constrained_vbr && st->vbr_reservoir < 0)
{
/* We're under the min value -- increase rate */
int adjust = (-st->vbr_reservoir)/(8<<BITRES);
/* Unless we're just coding silence */
nbAvailableBytes += silence?0:adjust;
st->vbr_reservoir = 0;
/*printf ("+%d\n", adjust);*/
}
nbCompressedBytes = IMIN(nbCompressedBytes,nbAvailableBytes+nbFilledBytes);
/*printf("%d\n", nbCompressedBytes*50*8);*/
/* This moves the raw bits to take into account the new compressed size */
ec_enc_shrink(enc, nbCompressedBytes);
}
/* Bit allocation */
ALLOC(fine_quant, st->mode->nbEBands, int);
ALLOC(pulses, st->mode->nbEBands, int);
ALLOC(fine_priority, st->mode->nbEBands, int);
/* bits = packet size - where we are - safety*/
bits = (((opus_int32)nbCompressedBytes*8)<<BITRES) - ec_tell_frac(enc) - 1;
anti_collapse_rsv = isTransient&&LM>=2&&bits>=((LM+2)<<BITRES) ? (1<<BITRES) : 0;
bits -= anti_collapse_rsv;
codedBands = compute_allocation(st->mode, st->start, st->end, offsets, cap,
alloc_trim, &st->intensity, &dual_stereo, bits, &balance, pulses,
fine_quant, fine_priority, C, LM, enc, 1, st->lastCodedBands);
st->lastCodedBands = codedBands;
quant_fine_energy(st->mode, st->start, st->end, oldBandE, error, fine_quant, enc, C);
#ifdef MEASURE_NORM_MSE
float X0[3000];
float bandE0[60];
c=0; do
for (i=0;i<N;i++)
X0[i+c*N] = X[i+c*N];
while (++c<C);
for (i=0;i<C*st->mode->nbEBands;i++)
bandE0[i] = bandE[i];
#endif
/* Residual quantisation */
ALLOC(collapse_masks, C*st->mode->nbEBands, unsigned char);
quant_all_bands(1, st->mode, st->start, st->end, X, C==2 ? X+N : NULL, collapse_masks,
bandE, pulses, shortBlocks, st->spread_decision, dual_stereo, st->intensity, tf_res,
nbCompressedBytes*(8<<BITRES)-anti_collapse_rsv, balance, enc, LM, codedBands, &st->rng);
if (anti_collapse_rsv > 0)
{
anti_collapse_on = st->consec_transient<2;
#ifdef FUZZING
anti_collapse_on = rand()&0x1;
#endif
ec_enc_bits(enc, anti_collapse_on, 1);
}
quant_energy_finalise(st->mode, st->start, st->end, oldBandE, error, fine_quant, fine_priority, nbCompressedBytes*8-ec_tell(enc), enc, C);
if (silence)
{
for (i=0;i<C*st->mode->nbEBands;i++)
oldBandE[i] = -QCONST16(28.f,DB_SHIFT);
}
#ifdef RESYNTH
/* Re-synthesis of the coded audio if required */
{
celt_sig *out_mem[2];
celt_sig *overlap_mem[2];
log2Amp(st->mode, st->start, st->end, bandE, oldBandE, C);
if (silence)
{
for (i=0;i<C*st->mode->nbEBands;i++)
bandE[i] = 0;
}
#ifdef MEASURE_NORM_MSE
measure_norm_mse(st->mode, X, X0, bandE, bandE0, M, N, C);
#endif
if (anti_collapse_on)
{
anti_collapse(st->mode, X, collapse_masks, LM, C, N,
st->start, st->end, oldBandE, oldLogE, oldLogE2, pulses, st->rng);
}
/* Synthesis */
denormalise_bands(st->mode, X, freq, bandE, effEnd, C, M);
OPUS_MOVE(st->syn_mem[0], st->syn_mem[0]+N, MAX_PERIOD);
if (CC==2)
OPUS_MOVE(st->syn_mem[1], st->syn_mem[1]+N, MAX_PERIOD);
c=0; do
for (i=0;i<M*st->mode->eBands[st->start];i++)
freq[c*N+i] = 0;
while (++c<C);
c=0; do
for (i=M*st->mode->eBands[st->end];i<N;i++)
freq[c*N+i] = 0;
while (++c<C);
if (CC==2&&C==1)
{
for (i=0;i<N;i++)
freq[N+i] = freq[i];
}
out_mem[0] = st->syn_mem[0]+MAX_PERIOD;
if (CC==2)
out_mem[1] = st->syn_mem[1]+MAX_PERIOD;
overlap_mem[0] = (celt_sig*)(oldLogE2 + CC*st->mode->nbEBands);
if (CC==2)
overlap_mem[1] = overlap_mem[0] + st->overlap;
compute_inv_mdcts(st->mode, shortBlocks, freq, out_mem, overlap_mem, CC, LM);
c=0; do {
st->prefilter_period=IMAX(st->prefilter_period, COMBFILTER_MINPERIOD);
st->prefilter_period_old=IMAX(st->prefilter_period_old, COMBFILTER_MINPERIOD);
comb_filter(out_mem[c], out_mem[c], st->prefilter_period_old, st->prefilter_period, st->mode->shortMdctSize,
st->prefilter_gain_old, st->prefilter_gain, st->prefilter_tapset_old, st->prefilter_tapset,
st->mode->window, st->overlap);
if (LM!=0)
comb_filter(out_mem[c]+st->mode->shortMdctSize, out_mem[c]+st->mode->shortMdctSize, st->prefilter_period, pitch_index, N-st->mode->shortMdctSize,
st->prefilter_gain, gain1, st->prefilter_tapset, prefilter_tapset,
st->mode->window, st->mode->overlap);
} while (++c<CC);
deemphasis(out_mem, (opus_val16*)pcm, N, CC, st->upsample, st->mode->preemph, st->preemph_memD);
st->prefilter_period_old = st->prefilter_period;
st->prefilter_gain_old = st->prefilter_gain;
st->prefilter_tapset_old = st->prefilter_tapset;
}
#endif
st->prefilter_period = pitch_index;
st->prefilter_gain = gain1;
st->prefilter_tapset = prefilter_tapset;
#ifdef RESYNTH
if (LM!=0)
{
st->prefilter_period_old = st->prefilter_period;
st->prefilter_gain_old = st->prefilter_gain;
st->prefilter_tapset_old = st->prefilter_tapset;
}
#endif
if (CC==2&&C==1) {
for (i=0;i<st->mode->nbEBands;i++)
oldBandE[st->mode->nbEBands+i]=oldBandE[i];
}
if (!isTransient)
{
for (i=0;i<CC*st->mode->nbEBands;i++)
oldLogE2[i] = oldLogE[i];
for (i=0;i<CC*st->mode->nbEBands;i++)
oldLogE[i] = oldBandE[i];
} else {
for (i=0;i<CC*st->mode->nbEBands;i++)
oldLogE[i] = MIN16(oldLogE[i], oldBandE[i]);
}
/* In case start or end were to change */
c=0; do
{
for (i=0;i<st->start;i++)
{
oldBandE[c*st->mode->nbEBands+i]=0;
oldLogE[c*st->mode->nbEBands+i]=oldLogE2[c*st->mode->nbEBands+i]=-QCONST16(28.f,DB_SHIFT);
}
for (i=st->end;i<st->mode->nbEBands;i++)
{
oldBandE[c*st->mode->nbEBands+i]=0;
oldLogE[c*st->mode->nbEBands+i]=oldLogE2[c*st->mode->nbEBands+i]=-QCONST16(28.f,DB_SHIFT);
}
} while (++c<CC);
if (isTransient)
st->consec_transient++;
else
st->consec_transient=0;
st->rng = enc->rng;
/* If there's any room left (can only happen for very high rates),
it's already filled with zeros */
ec_enc_done(enc);
#ifdef CUSTOM_MODES
if (st->signalling)
nbCompressedBytes++;
#endif
RESTORE_STACK;
if (ec_get_error(enc))
return OPUS_INTERNAL_ERROR;
else
return nbCompressedBytes;
}
#ifdef CUSTOM_MODES
#ifdef FIXED_POINT
int opus_custom_encode(CELTEncoder * OPUS_RESTRICT st, const opus_int16 * pcm, int frame_size, unsigned char *compressed, int nbCompressedBytes)
{
return celt_encode_with_ec(st, pcm, frame_size, compressed, nbCompressedBytes, NULL);
}
#ifndef DISABLE_FLOAT_API
int opus_custom_encode_float(CELTEncoder * OPUS_RESTRICT st, const float * pcm, int frame_size, unsigned char *compressed, int nbCompressedBytes)
{
int j, ret, C, N;
VARDECL(opus_int16, in);
ALLOC_STACK;
if (pcm==NULL)
return OPUS_BAD_ARG;
C = st->channels;
N = frame_size;
ALLOC(in, C*N, opus_int16);
for (j=0;j<C*N;j++)
in[j] = FLOAT2INT16(pcm[j]);
ret=celt_encode_with_ec(st,in,frame_size,compressed,nbCompressedBytes, NULL);
#ifdef RESYNTH
for (j=0;j<C*N;j++)
((float*)pcm)[j]=in[j]*(1.f/32768.f);
#endif
RESTORE_STACK;
return ret;
}
#endif /* DISABLE_FLOAT_API */
#else
int opus_custom_encode(CELTEncoder * OPUS_RESTRICT st, const opus_int16 * pcm, int frame_size, unsigned char *compressed, int nbCompressedBytes)
{
int j, ret, C, N;
VARDECL(celt_sig, in);
ALLOC_STACK;
if (pcm==NULL)
return OPUS_BAD_ARG;
C=st->channels;
N=frame_size;
ALLOC(in, C*N, celt_sig);
for (j=0;j<C*N;j++) {
in[j] = SCALEOUT(pcm[j]);
}
ret = celt_encode_with_ec(st,in,frame_size,compressed,nbCompressedBytes, NULL);
#ifdef RESYNTH
for (j=0;j<C*N;j++)
((opus_int16*)pcm)[j] = FLOAT2INT16(in[j]);
#endif
RESTORE_STACK;
return ret;
}
int opus_custom_encode_float(CELTEncoder * OPUS_RESTRICT st, const float * pcm, int frame_size, unsigned char *compressed, int nbCompressedBytes)
{
return celt_encode_with_ec(st, pcm, frame_size, compressed, nbCompressedBytes, NULL);
}
#endif
#endif /* CUSTOM_MODES */
int opus_custom_encoder_ctl(CELTEncoder * OPUS_RESTRICT st, int request, ...)
{
va_list ap;
va_start(ap, request);
switch (request)
{
case OPUS_SET_COMPLEXITY_REQUEST:
{
int value = va_arg(ap, opus_int32);
if (value<0 || value>10)
goto bad_arg;
st->complexity = value;
}
break;
case CELT_SET_START_BAND_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<0 || value>=st->mode->nbEBands)
goto bad_arg;
st->start = value;
}
break;
case CELT_SET_END_BAND_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<1 || value>st->mode->nbEBands)
goto bad_arg;
st->end = value;
}
break;
case CELT_SET_PREDICTION_REQUEST:
{
int value = va_arg(ap, opus_int32);
if (value<0 || value>2)
goto bad_arg;
st->disable_pf = value<=1;
st->force_intra = value==0;
}
break;
case OPUS_SET_PACKET_LOSS_PERC_REQUEST:
{
int value = va_arg(ap, opus_int32);
if (value<0 || value>100)
goto bad_arg;
st->loss_rate = value;
}
break;
case OPUS_SET_VBR_CONSTRAINT_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->constrained_vbr = value;
}
break;
case OPUS_SET_VBR_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->vbr = value;
}
break;
case OPUS_SET_BITRATE_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<=500 && value!=OPUS_BITRATE_MAX)
goto bad_arg;
value = IMIN(value, 260000*st->channels);
st->bitrate = value;
}
break;
case CELT_SET_CHANNELS_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<1 || value>2)
goto bad_arg;
st->stream_channels = value;
}
break;
case OPUS_SET_LSB_DEPTH_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<8 || value>24)
goto bad_arg;
st->lsb_depth=value;
}
break;
case OPUS_GET_LSB_DEPTH_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value=st->lsb_depth;
}
break;
case OPUS_RESET_STATE:
{
int i;
opus_val16 *oldBandE, *oldLogE, *oldLogE2;
oldBandE = (opus_val16*)(st->in_mem+st->channels*(st->overlap+COMBFILTER_MAXPERIOD));
oldLogE = oldBandE + st->channels*st->mode->nbEBands;
oldLogE2 = oldLogE + st->channels*st->mode->nbEBands;
OPUS_CLEAR((char*)&st->ENCODER_RESET_START,
opus_custom_encoder_get_size(st->mode, st->channels)-
((char*)&st->ENCODER_RESET_START - (char*)st));
for (i=0;i<st->channels*st->mode->nbEBands;i++)
oldLogE[i]=oldLogE2[i]=-QCONST16(28.f,DB_SHIFT);
st->vbr_offset = 0;
st->delayedIntra = 1;
st->spread_decision = SPREAD_NORMAL;
st->tonal_average = 256;
st->hf_average = 0;
st->tapset_decision = 0;
}
break;
#ifdef CUSTOM_MODES
case CELT_SET_INPUT_CLIPPING_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->clip = value;
}
break;
#endif
case CELT_SET_SIGNALLING_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->signalling = value;
}
break;
case CELT_SET_ANALYSIS_REQUEST:
{
AnalysisInfo *info = va_arg(ap, AnalysisInfo *);
if (info)
OPUS_COPY(&st->analysis, info, 1);
}
break;
case CELT_GET_MODE_REQUEST:
{
const CELTMode ** value = va_arg(ap, const CELTMode**);
if (value==0)
goto bad_arg;
*value=st->mode;
}
break;
case OPUS_GET_FINAL_RANGE_REQUEST:
{
opus_uint32 * value = va_arg(ap, opus_uint32 *);
if (value==0)
goto bad_arg;
*value=st->rng;
}
break;
default:
goto bad_request;
}
va_end(ap);
return OPUS_OK;
bad_arg:
va_end(ap);
return OPUS_BAD_ARG;
bad_request:
va_end(ap);
return OPUS_UNIMPLEMENTED;
}
/**********************************************************************/
/* */
/* DECODER */
/* */
/**********************************************************************/
#define DECODE_BUFFER_SIZE 2048
/** Decoder state
@brief Decoder state
*/
struct OpusCustomDecoder {
const OpusCustomMode *mode;
int overlap;
int channels;
int stream_channels;
int downsample;
int start, end;
int signalling;
/* Everything beyond this point gets cleared on a reset */
#define DECODER_RESET_START rng
opus_uint32 rng;
int error;
int last_pitch_index;
int loss_count;
int postfilter_period;
int postfilter_period_old;
opus_val16 postfilter_gain;
opus_val16 postfilter_gain_old;
int postfilter_tapset;
int postfilter_tapset_old;
celt_sig preemph_memD[2];
celt_sig _decode_mem[1]; /* Size = channels*(DECODE_BUFFER_SIZE+mode->overlap) */
/* opus_val16 lpc[], Size = channels*LPC_ORDER */
/* opus_val16 oldEBands[], Size = 2*mode->nbEBands */
/* opus_val16 oldLogE[], Size = 2*mode->nbEBands */
/* opus_val16 oldLogE2[], Size = 2*mode->nbEBands */
/* opus_val16 backgroundLogE[], Size = 2*mode->nbEBands */
};
int celt_decoder_get_size(int channels)
{
const CELTMode *mode = opus_custom_mode_create(48000, 960, NULL);
return opus_custom_decoder_get_size(mode, channels);
}
OPUS_CUSTOM_NOSTATIC int opus_custom_decoder_get_size(const CELTMode *mode, int channels)
{
int size = sizeof(struct CELTDecoder)
+ (channels*(DECODE_BUFFER_SIZE+mode->overlap)-1)*sizeof(celt_sig)
+ channels*LPC_ORDER*sizeof(opus_val16)
+ 4*2*mode->nbEBands*sizeof(opus_val16);
return size;
}
#ifdef CUSTOM_MODES
CELTDecoder *opus_custom_decoder_create(const CELTMode *mode, int channels, int *error)
{
int ret;
CELTDecoder *st = (CELTDecoder *)opus_alloc(opus_custom_decoder_get_size(mode, channels));
ret = opus_custom_decoder_init(st, mode, channels);
if (ret != OPUS_OK)
{
opus_custom_decoder_destroy(st);
st = NULL;
}
if (error)
*error = ret;
return st;
}
#endif /* CUSTOM_MODES */
int celt_decoder_init(CELTDecoder *st, opus_int32 sampling_rate, int channels)
{
int ret;
ret = opus_custom_decoder_init(st, opus_custom_mode_create(48000, 960, NULL), channels);
if (ret != OPUS_OK)
return ret;
st->downsample = resampling_factor(sampling_rate);
if (st->downsample==0)
return OPUS_BAD_ARG;
else
return OPUS_OK;
}
OPUS_CUSTOM_NOSTATIC int opus_custom_decoder_init(CELTDecoder *st, const CELTMode *mode, int channels)
{
if (channels < 0 || channels > 2)
return OPUS_BAD_ARG;
if (st==NULL)
return OPUS_ALLOC_FAIL;
OPUS_CLEAR((char*)st, opus_custom_decoder_get_size(mode, channels));
st->mode = mode;
st->overlap = mode->overlap;
st->stream_channels = st->channels = channels;
st->downsample = 1;
st->start = 0;
st->end = st->mode->effEBands;
st->signalling = 1;
st->loss_count = 0;
opus_custom_decoder_ctl(st, OPUS_RESET_STATE);
return OPUS_OK;
}
#ifdef CUSTOM_MODES
void opus_custom_decoder_destroy(CELTDecoder *st)
{
opus_free(st);
}
#endif /* CUSTOM_MODES */
static void celt_decode_lost(CELTDecoder * OPUS_RESTRICT st, opus_val16 * OPUS_RESTRICT pcm, int N, int LM)
{
int c;
int pitch_index;
int overlap = st->mode->overlap;
opus_val16 fade = Q15ONE;
int i, len;
const int C = st->channels;
int offset;
celt_sig *out_mem[2];
celt_sig *decode_mem[2];
celt_sig *overlap_mem[2];
opus_val16 *lpc;
opus_val32 *out_syn[2];
opus_val16 *oldBandE, *oldLogE, *oldLogE2, *backgroundLogE;
SAVE_STACK;
c=0; do {
decode_mem[c] = st->_decode_mem + c*(DECODE_BUFFER_SIZE+st->overlap);
out_mem[c] = decode_mem[c]+DECODE_BUFFER_SIZE-MAX_PERIOD;
overlap_mem[c] = decode_mem[c]+DECODE_BUFFER_SIZE;
} while (++c<C);
lpc = (opus_val16*)(st->_decode_mem+(DECODE_BUFFER_SIZE+st->overlap)*C);
oldBandE = lpc+C*LPC_ORDER;
oldLogE = oldBandE + 2*st->mode->nbEBands;
oldLogE2 = oldLogE + 2*st->mode->nbEBands;
backgroundLogE = oldLogE2 + 2*st->mode->nbEBands;
out_syn[0] = out_mem[0]+MAX_PERIOD-N;
if (C==2)
out_syn[1] = out_mem[1]+MAX_PERIOD-N;
len = N+st->mode->overlap;
if (st->loss_count >= 5 || st->start!=0)
{
/* Noise-based PLC/CNG */
VARDECL(celt_sig, freq);
VARDECL(celt_norm, X);
VARDECL(celt_ener, bandE);
opus_uint32 seed;
int effEnd;
effEnd = st->end;
if (effEnd > st->mode->effEBands)
effEnd = st->mode->effEBands;
ALLOC(freq, C*N, celt_sig); /**< Interleaved signal MDCTs */
ALLOC(X, C*N, celt_norm); /**< Interleaved normalised MDCTs */
ALLOC(bandE, st->mode->nbEBands*C, celt_ener);
if (st->loss_count >= 5)
log2Amp(st->mode, st->start, st->end, bandE, backgroundLogE, C);
else {
/* Energy decay */
opus_val16 decay = st->loss_count==0 ? QCONST16(1.5f, DB_SHIFT) : QCONST16(.5f, DB_SHIFT);
c=0; do
{
for (i=st->start;i<st->end;i++)
oldBandE[c*st->mode->nbEBands+i] -= decay;
} while (++c<C);
log2Amp(st->mode, st->start, st->end, bandE, oldBandE, C);
}
seed = st->rng;
for (c=0;c<C;c++)
{
for (i=0;i<(st->mode->eBands[st->start]<<LM);i++)
X[c*N+i] = 0;
for (i=st->start;i<st->mode->effEBands;i++)
{
int j;
int boffs;
int blen;
boffs = N*c+(st->mode->eBands[i]<<LM);
blen = (st->mode->eBands[i+1]-st->mode->eBands[i])<<LM;
for (j=0;j<blen;j++)
{
seed = celt_lcg_rand(seed);
X[boffs+j] = (celt_norm)((opus_int32)seed>>20);
}
renormalise_vector(X+boffs, blen, Q15ONE);
}
for (i=(st->mode->eBands[st->end]<<LM);i<N;i++)
X[c*N+i] = 0;
}
st->rng = seed;
denormalise_bands(st->mode, X, freq, bandE, st->mode->effEBands, C, 1<<LM);
c=0; do
for (i=0;i<st->mode->eBands[st->start]<<LM;i++)
freq[c*N+i] = 0;
while (++c<C);
c=0; do {
int bound = st->mode->eBands[effEnd]<<LM;
if (st->downsample!=1)
bound = IMIN(bound, N/st->downsample);
for (i=bound;i<N;i++)
freq[c*N+i] = 0;
} while (++c<C);
compute_inv_mdcts(st->mode, 0, freq, out_syn, overlap_mem, C, LM);
} else {
/* Pitch-based PLC */
if (st->loss_count == 0)
{
opus_val16 pitch_buf[DECODE_BUFFER_SIZE>>1];
/* Corresponds to a min pitch of 67 Hz. It's possible to save CPU in this
search by using only part of the decode buffer */
int poffset = 720;
pitch_downsample(decode_mem, pitch_buf, DECODE_BUFFER_SIZE, C);
/* Max pitch is 100 samples (480 Hz) */
pitch_search(pitch_buf+((poffset)>>1), pitch_buf, DECODE_BUFFER_SIZE-poffset,
poffset-100, &pitch_index);
pitch_index = poffset-pitch_index;
st->last_pitch_index = pitch_index;
} else {
pitch_index = st->last_pitch_index;
fade = QCONST16(.8f,15);
}
c=0; do {
VARDECL(opus_val32, e);
opus_val16 exc[MAX_PERIOD];
opus_val32 ac[LPC_ORDER+1];
opus_val16 decay = 1;
opus_val32 S1=0;
opus_val16 mem[LPC_ORDER]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
ALLOC(e, MAX_PERIOD+2*st->mode->overlap, opus_val32);
offset = MAX_PERIOD-pitch_index;
for (i=0;i<MAX_PERIOD;i++)
exc[i] = ROUND16(out_mem[c][i], SIG_SHIFT);
if (st->loss_count == 0)
{
_celt_autocorr(exc, ac, st->mode->window, st->mode->overlap,
LPC_ORDER, MAX_PERIOD);
/* Noise floor -40 dB */
#ifdef FIXED_POINT
ac[0] += SHR32(ac[0],13);
#else
ac[0] *= 1.0001f;
#endif
/* Lag windowing */
for (i=1;i<=LPC_ORDER;i++)
{
/*ac[i] *= exp(-.5*(2*M_PI*.002*i)*(2*M_PI*.002*i));*/
#ifdef FIXED_POINT
ac[i] -= MULT16_32_Q15(2*i*i, ac[i]);
#else
ac[i] -= ac[i]*(.008f*i)*(.008f*i);
#endif
}
_celt_lpc(lpc+c*LPC_ORDER, ac, LPC_ORDER);
}
for (i=0;i<LPC_ORDER;i++)
mem[i] = ROUND16(out_mem[c][MAX_PERIOD-1-i], SIG_SHIFT);
celt_fir(exc, lpc+c*LPC_ORDER, exc, MAX_PERIOD, LPC_ORDER, mem);
/*for (i=0;i<MAX_PERIOD;i++)printf("%d ", exc[i]); printf("\n");*/
/* Check if the waveform is decaying (and if so how fast) */
{
opus_val32 E1=1, E2=1;
int period;
if (pitch_index <= MAX_PERIOD/2)
period = pitch_index;
else
period = MAX_PERIOD/2;
for (i=0;i<period;i++)
{
E1 += SHR32(MULT16_16(exc[MAX_PERIOD-period+i],exc[MAX_PERIOD-period+i]),8);
E2 += SHR32(MULT16_16(exc[MAX_PERIOD-2*period+i],exc[MAX_PERIOD-2*period+i]),8);
}
if (E1 > E2)
E1 = E2;
decay = celt_sqrt(frac_div32(SHR32(E1,1),E2));
}
/* Copy excitation, taking decay into account */
for (i=0;i<len+st->mode->overlap;i++)
{
opus_val16 tmp;
if (offset+i >= MAX_PERIOD)
{
offset -= pitch_index;
decay = MULT16_16_Q15(decay, decay);
}
e[i] = SHL32(EXTEND32(MULT16_16_Q15(decay, exc[offset+i])), SIG_SHIFT);
tmp = ROUND16(out_mem[c][offset+i],SIG_SHIFT);
S1 += SHR32(MULT16_16(tmp,tmp),8);
}
for (i=0;i<LPC_ORDER;i++)
mem[i] = ROUND16(out_mem[c][MAX_PERIOD-1-i], SIG_SHIFT);
for (i=0;i<len+st->mode->overlap;i++)
e[i] = MULT16_32_Q15(fade, e[i]);
celt_iir(e, lpc+c*LPC_ORDER, e, len+st->mode->overlap, LPC_ORDER, mem);
{
opus_val32 S2=0;
for (i=0;i<len+overlap;i++)
{
opus_val16 tmp = ROUND16(e[i],SIG_SHIFT);
S2 += SHR32(MULT16_16(tmp,tmp),8);
}
/* This checks for an "explosion" in the synthesis */
#ifdef FIXED_POINT
if (!(S1 > SHR32(S2,2)))
#else
/* Float test is written this way to catch NaNs at the same time */
if (!(S1 > 0.2f*S2))
#endif
{
for (i=0;i<len+overlap;i++)
e[i] = 0;
} else if (S1 < S2)
{
opus_val16 ratio = celt_sqrt(frac_div32(SHR32(S1,1)+1,S2+1));
for (i=0;i<len+overlap;i++)
e[i] = MULT16_32_Q15(ratio, e[i]);
}
}
/* Apply post-filter to the MDCT overlap of the previous frame */
comb_filter(out_mem[c]+MAX_PERIOD, out_mem[c]+MAX_PERIOD, st->postfilter_period, st->postfilter_period, st->overlap,
st->postfilter_gain, st->postfilter_gain, st->postfilter_tapset, st->postfilter_tapset,
NULL, 0);
for (i=0;i<MAX_PERIOD+st->mode->overlap-N;i++)
out_mem[c][i] = out_mem[c][N+i];
/* Apply TDAC to the concealed audio so that it blends with the
previous and next frames */
for (i=0;i<overlap/2;i++)
{
opus_val32 tmp;
tmp = MULT16_32_Q15(st->mode->window[i], e[N+overlap-1-i]) +
MULT16_32_Q15(st->mode->window[overlap-i-1], e[N+i ]);
out_mem[c][MAX_PERIOD+i] = MULT16_32_Q15(st->mode->window[overlap-i-1], tmp);
out_mem[c][MAX_PERIOD+overlap-i-1] = MULT16_32_Q15(st->mode->window[i], tmp);
}
for (i=0;i<N;i++)
out_mem[c][MAX_PERIOD-N+i] = e[i];
/* Apply pre-filter to the MDCT overlap for the next frame (post-filter will be applied then) */
comb_filter(e, out_mem[c]+MAX_PERIOD, st->postfilter_period, st->postfilter_period, st->overlap,
-st->postfilter_gain, -st->postfilter_gain, st->postfilter_tapset, st->postfilter_tapset,
NULL, 0);
for (i=0;i<overlap;i++)
out_mem[c][MAX_PERIOD+i] = e[i];
} while (++c<C);
}
deemphasis(out_syn, pcm, N, C, st->downsample, st->mode->preemph, st->preemph_memD);
st->loss_count++;
RESTORE_STACK;
}
int celt_decode_with_ec(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, opus_val16 * OPUS_RESTRICT pcm, int frame_size, ec_dec *dec)
{
int c, i, N;
int spread_decision;
opus_int32 bits;
ec_dec _dec;
VARDECL(celt_sig, freq);
VARDECL(celt_norm, X);
VARDECL(celt_ener, bandE);
VARDECL(int, fine_quant);
VARDECL(int, pulses);
VARDECL(int, cap);
VARDECL(int, offsets);
VARDECL(int, fine_priority);
VARDECL(int, tf_res);
VARDECL(unsigned char, collapse_masks);
celt_sig *out_mem[2];
celt_sig *decode_mem[2];
celt_sig *overlap_mem[2];
celt_sig *out_syn[2];
opus_val16 *lpc;
opus_val16 *oldBandE, *oldLogE, *oldLogE2, *backgroundLogE;
int shortBlocks;
int isTransient;
int intra_ener;
const int CC = st->channels;
int LM, M;
int effEnd;
int codedBands;
int alloc_trim;
int postfilter_pitch;
opus_val16 postfilter_gain;
int intensity=0;
int dual_stereo=0;
opus_int32 total_bits;
opus_int32 balance;
opus_int32 tell;
int dynalloc_logp;
int postfilter_tapset;
int anti_collapse_rsv;
int anti_collapse_on=0;
int silence;
int C = st->stream_channels;
ALLOC_STACK;
frame_size *= st->downsample;
c=0; do {
decode_mem[c] = st->_decode_mem + c*(DECODE_BUFFER_SIZE+st->overlap);
out_mem[c] = decode_mem[c]+DECODE_BUFFER_SIZE-MAX_PERIOD;
overlap_mem[c] = decode_mem[c]+DECODE_BUFFER_SIZE;
} while (++c<CC);
lpc = (opus_val16*)(st->_decode_mem+(DECODE_BUFFER_SIZE+st->overlap)*CC);
oldBandE = lpc+CC*LPC_ORDER;
oldLogE = oldBandE + 2*st->mode->nbEBands;
oldLogE2 = oldLogE + 2*st->mode->nbEBands;
backgroundLogE = oldLogE2 + 2*st->mode->nbEBands;
#ifdef CUSTOM_MODES
if (st->signalling && data!=NULL)
{
int data0=data[0];
/* Convert "standard mode" to Opus header */
if (st->mode->Fs==48000 && st->mode->shortMdctSize==120)
{
data0 = fromOpus(data0);
if (data0<0)
return OPUS_INVALID_PACKET;
}
st->end = IMAX(1, st->mode->effEBands-2*(data0>>5));
LM = (data0>>3)&0x3;
C = 1 + ((data0>>2)&0x1);
data++;
len--;
if (LM>st->mode->maxLM)
return OPUS_INVALID_PACKET;
if (frame_size < st->mode->shortMdctSize<<LM)
return OPUS_BUFFER_TOO_SMALL;
else
frame_size = st->mode->shortMdctSize<<LM;
} else {
#else
{
#endif
for (LM=0;LM<=st->mode->maxLM;LM++)
if (st->mode->shortMdctSize<<LM==frame_size)
break;
if (LM>st->mode->maxLM)
return OPUS_BAD_ARG;
}
M=1<<LM;
if (len<0 || len>1275 || pcm==NULL)
return OPUS_BAD_ARG;
N = M*st->mode->shortMdctSize;
effEnd = st->end;
if (effEnd > st->mode->effEBands)
effEnd = st->mode->effEBands;
ALLOC(freq, IMAX(CC,C)*N, celt_sig); /**< Interleaved signal MDCTs */
ALLOC(X, C*N, celt_norm); /**< Interleaved normalised MDCTs */
ALLOC(bandE, st->mode->nbEBands*C, celt_ener);
c=0; do
for (i=0;i<M*st->mode->eBands[st->start];i++)
X[c*N+i] = 0;
while (++c<C);
c=0; do
for (i=M*st->mode->eBands[effEnd];i<N;i++)
X[c*N+i] = 0;
while (++c<C);
if (data == NULL || len<=1)
{
celt_decode_lost(st, pcm, N, LM);
RESTORE_STACK;
return frame_size/st->downsample;
}
if (dec == NULL)
{
ec_dec_init(&_dec,(unsigned char*)data,len);
dec = &_dec;
}
if (C==1)
{
for (i=0;i<st->mode->nbEBands;i++)
oldBandE[i]=MAX16(oldBandE[i],oldBandE[st->mode->nbEBands+i]);
}
total_bits = len*8;
tell = ec_tell(dec);
if (tell >= total_bits)
silence = 1;
else if (tell==1)
silence = ec_dec_bit_logp(dec, 15);
else
silence = 0;
if (silence)
{
/* Pretend we've read all the remaining bits */
tell = len*8;
dec->nbits_total+=tell-ec_tell(dec);
}
postfilter_gain = 0;
postfilter_pitch = 0;
postfilter_tapset = 0;
if (st->start==0 && tell+16 <= total_bits)
{
if(ec_dec_bit_logp(dec, 1))
{
int qg, octave;
octave = ec_dec_uint(dec, 6);
postfilter_pitch = (16<<octave)+ec_dec_bits(dec, 4+octave)-1;
qg = ec_dec_bits(dec, 3);
if (ec_tell(dec)+2<=total_bits)
postfilter_tapset = ec_dec_icdf(dec, tapset_icdf, 2);
postfilter_gain = QCONST16(.09375f,15)*(qg+1);
}
tell = ec_tell(dec);
}
if (LM > 0 && tell+3 <= total_bits)
{
isTransient = ec_dec_bit_logp(dec, 3);
tell = ec_tell(dec);
}
else
isTransient = 0;
if (isTransient)
shortBlocks = M;
else
shortBlocks = 0;
/* Decode the global flags (first symbols in the stream) */
intra_ener = tell+3<=total_bits ? ec_dec_bit_logp(dec, 3) : 0;
/* Get band energies */
unquant_coarse_energy(st->mode, st->start, st->end, oldBandE,
intra_ener, dec, C, LM);
ALLOC(tf_res, st->mode->nbEBands, int);
tf_decode(st->start, st->end, isTransient, tf_res, LM, dec);
tell = ec_tell(dec);
spread_decision = SPREAD_NORMAL;
if (tell+4 <= total_bits)
spread_decision = ec_dec_icdf(dec, spread_icdf, 5);
ALLOC(pulses, st->mode->nbEBands, int);
ALLOC(cap, st->mode->nbEBands, int);
ALLOC(offsets, st->mode->nbEBands, int);
ALLOC(fine_priority, st->mode->nbEBands, int);
init_caps(st->mode,cap,LM,C);
dynalloc_logp = 6;
total_bits<<=BITRES;
tell = ec_tell_frac(dec);
for (i=st->start;i<st->end;i++)
{
int width, quanta;
int dynalloc_loop_logp;
int boost;
width = C*(st->mode->eBands[i+1]-st->mode->eBands[i])<<LM;
/* quanta is 6 bits, but no more than 1 bit/sample
and no less than 1/8 bit/sample */
quanta = IMIN(width<<BITRES, IMAX(6<<BITRES, width));
dynalloc_loop_logp = dynalloc_logp;
boost = 0;
while (tell+(dynalloc_loop_logp<<BITRES) < total_bits && boost < cap[i])
{
int flag;
flag = ec_dec_bit_logp(dec, dynalloc_loop_logp);
tell = ec_tell_frac(dec);
if (!flag)
break;
boost += quanta;
total_bits -= quanta;
dynalloc_loop_logp = 1;
}
offsets[i] = boost;
/* Making dynalloc more likely */
if (boost>0)
dynalloc_logp = IMAX(2, dynalloc_logp-1);
}
ALLOC(fine_quant, st->mode->nbEBands, int);
alloc_trim = tell+(6<<BITRES) <= total_bits ?
ec_dec_icdf(dec, trim_icdf, 7) : 5;
bits = (((opus_int32)len*8)<<BITRES) - ec_tell_frac(dec) - 1;
anti_collapse_rsv = isTransient&&LM>=2&&bits>=((LM+2)<<BITRES) ? (1<<BITRES) : 0;
bits -= anti_collapse_rsv;
codedBands = compute_allocation(st->mode, st->start, st->end, offsets, cap,
alloc_trim, &intensity, &dual_stereo, bits, &balance, pulses,
fine_quant, fine_priority, C, LM, dec, 0, 0);
unquant_fine_energy(st->mode, st->start, st->end, oldBandE, fine_quant, dec, C);
/* Decode fixed codebook */
ALLOC(collapse_masks, C*st->mode->nbEBands, unsigned char);
quant_all_bands(0, st->mode, st->start, st->end, X, C==2 ? X+N : NULL, collapse_masks,
NULL, pulses, shortBlocks, spread_decision, dual_stereo, intensity, tf_res,
len*(8<<BITRES)-anti_collapse_rsv, balance, dec, LM, codedBands, &st->rng);
if (anti_collapse_rsv > 0)
{
anti_collapse_on = ec_dec_bits(dec, 1);
}
unquant_energy_finalise(st->mode, st->start, st->end, oldBandE,
fine_quant, fine_priority, len*8-ec_tell(dec), dec, C);
if (anti_collapse_on)
anti_collapse(st->mode, X, collapse_masks, LM, C, N,
st->start, st->end, oldBandE, oldLogE, oldLogE2, pulses, st->rng);
log2Amp(st->mode, st->start, st->end, bandE, oldBandE, C);
if (silence)
{
for (i=0;i<C*st->mode->nbEBands;i++)
{
bandE[i] = 0;
oldBandE[i] = -QCONST16(28.f,DB_SHIFT);
}
}
/* Synthesis */
denormalise_bands(st->mode, X, freq, bandE, effEnd, C, M);
OPUS_MOVE(decode_mem[0], decode_mem[0]+N, DECODE_BUFFER_SIZE-N);
if (CC==2)
OPUS_MOVE(decode_mem[1], decode_mem[1]+N, DECODE_BUFFER_SIZE-N);
c=0; do
for (i=0;i<M*st->mode->eBands[st->start];i++)
freq[c*N+i] = 0;
while (++c<C);
c=0; do {
int bound = M*st->mode->eBands[effEnd];
if (st->downsample!=1)
bound = IMIN(bound, N/st->downsample);
for (i=bound;i<N;i++)
freq[c*N+i] = 0;
} while (++c<C);
out_syn[0] = out_mem[0]+MAX_PERIOD-N;
if (CC==2)
out_syn[1] = out_mem[1]+MAX_PERIOD-N;
if (CC==2&&C==1)
{
for (i=0;i<N;i++)
freq[N+i] = freq[i];
}
if (CC==1&&C==2)
{
for (i=0;i<N;i++)
freq[i] = HALF32(ADD32(freq[i],freq[N+i]));
}
/* Compute inverse MDCTs */
compute_inv_mdcts(st->mode, shortBlocks, freq, out_syn, overlap_mem, CC, LM);
c=0; do {
st->postfilter_period=IMAX(st->postfilter_period, COMBFILTER_MINPERIOD);
st->postfilter_period_old=IMAX(st->postfilter_period_old, COMBFILTER_MINPERIOD);
comb_filter(out_syn[c], out_syn[c], st->postfilter_period_old, st->postfilter_period, st->mode->shortMdctSize,
st->postfilter_gain_old, st->postfilter_gain, st->postfilter_tapset_old, st->postfilter_tapset,
st->mode->window, st->overlap);
if (LM!=0)
comb_filter(out_syn[c]+st->mode->shortMdctSize, out_syn[c]+st->mode->shortMdctSize, st->postfilter_period, postfilter_pitch, N-st->mode->shortMdctSize,
st->postfilter_gain, postfilter_gain, st->postfilter_tapset, postfilter_tapset,
st->mode->window, st->mode->overlap);
} while (++c<CC);
st->postfilter_period_old = st->postfilter_period;
st->postfilter_gain_old = st->postfilter_gain;
st->postfilter_tapset_old = st->postfilter_tapset;
st->postfilter_period = postfilter_pitch;
st->postfilter_gain = postfilter_gain;
st->postfilter_tapset = postfilter_tapset;
if (LM!=0)
{
st->postfilter_period_old = st->postfilter_period;
st->postfilter_gain_old = st->postfilter_gain;
st->postfilter_tapset_old = st->postfilter_tapset;
}
if (C==1) {
for (i=0;i<st->mode->nbEBands;i++)
oldBandE[st->mode->nbEBands+i]=oldBandE[i];
}
/* In case start or end were to change */
if (!isTransient)
{
for (i=0;i<2*st->mode->nbEBands;i++)
oldLogE2[i] = oldLogE[i];
for (i=0;i<2*st->mode->nbEBands;i++)
oldLogE[i] = oldBandE[i];
for (i=0;i<2*st->mode->nbEBands;i++)
backgroundLogE[i] = MIN16(backgroundLogE[i] + M*QCONST16(0.001f,DB_SHIFT), oldBandE[i]);
} else {
for (i=0;i<2*st->mode->nbEBands;i++)
oldLogE[i] = MIN16(oldLogE[i], oldBandE[i]);
}
c=0; do
{
for (i=0;i<st->start;i++)
{
oldBandE[c*st->mode->nbEBands+i]=0;
oldLogE[c*st->mode->nbEBands+i]=oldLogE2[c*st->mode->nbEBands+i]=-QCONST16(28.f,DB_SHIFT);
}
for (i=st->end;i<st->mode->nbEBands;i++)
{
oldBandE[c*st->mode->nbEBands+i]=0;
oldLogE[c*st->mode->nbEBands+i]=oldLogE2[c*st->mode->nbEBands+i]=-QCONST16(28.f,DB_SHIFT);
}
} while (++c<2);
st->rng = dec->rng;
deemphasis(out_syn, pcm, N, CC, st->downsample, st->mode->preemph, st->preemph_memD);
st->loss_count = 0;
RESTORE_STACK;
if (ec_tell(dec) > 8*len)
return OPUS_INTERNAL_ERROR;
if(ec_get_error(dec))
st->error = 1;
return frame_size/st->downsample;
}
#ifdef CUSTOM_MODES
#ifdef FIXED_POINT
int opus_custom_decode(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, opus_int16 * OPUS_RESTRICT pcm, int frame_size)
{
return celt_decode_with_ec(st, data, len, pcm, frame_size, NULL);
}
#ifndef DISABLE_FLOAT_API
int opus_custom_decode_float(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, float * OPUS_RESTRICT pcm, int frame_size)
{
int j, ret, C, N;
VARDECL(opus_int16, out);
ALLOC_STACK;
if (pcm==NULL)
return OPUS_BAD_ARG;
C = st->channels;
N = frame_size;
ALLOC(out, C*N, opus_int16);
ret=celt_decode_with_ec(st, data, len, out, frame_size, NULL);
if (ret>0)
for (j=0;j<C*ret;j++)
pcm[j]=out[j]*(1.f/32768.f);
RESTORE_STACK;
return ret;
}
#endif /* DISABLE_FLOAT_API */
#else
int opus_custom_decode_float(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, float * OPUS_RESTRICT pcm, int frame_size)
{
return celt_decode_with_ec(st, data, len, pcm, frame_size, NULL);
}
int opus_custom_decode(CELTDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, opus_int16 * OPUS_RESTRICT pcm, int frame_size)
{
int j, ret, C, N;
VARDECL(celt_sig, out);
ALLOC_STACK;
if (pcm==NULL)
return OPUS_BAD_ARG;
C = st->channels;
N = frame_size;
ALLOC(out, C*N, celt_sig);
ret=celt_decode_with_ec(st, data, len, out, frame_size, NULL);
if (ret>0)
for (j=0;j<C*ret;j++)
pcm[j] = FLOAT2INT16 (out[j]);
RESTORE_STACK;
return ret;
}
#endif
#endif /* CUSTOM_MODES */
int opus_custom_decoder_ctl(CELTDecoder * OPUS_RESTRICT st, int request, ...)
{
va_list ap;
va_start(ap, request);
switch (request)
{
case CELT_SET_START_BAND_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<0 || value>=st->mode->nbEBands)
goto bad_arg;
st->start = value;
}
break;
case CELT_SET_END_BAND_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<1 || value>st->mode->nbEBands)
goto bad_arg;
st->end = value;
}
break;
case CELT_SET_CHANNELS_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value<1 || value>2)
goto bad_arg;
st->stream_channels = value;
}
break;
case CELT_GET_AND_CLEAR_ERROR_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
if (value==NULL)
goto bad_arg;
*value=st->error;
st->error = 0;
}
break;
case OPUS_GET_LOOKAHEAD_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
if (value==NULL)
goto bad_arg;
*value = st->overlap/st->downsample;
}
break;
case OPUS_RESET_STATE:
{
int i;
opus_val16 *lpc, *oldBandE, *oldLogE, *oldLogE2;
lpc = (opus_val16*)(st->_decode_mem+(DECODE_BUFFER_SIZE+st->overlap)*st->channels);
oldBandE = lpc+st->channels*LPC_ORDER;
oldLogE = oldBandE + 2*st->mode->nbEBands;
oldLogE2 = oldLogE + 2*st->mode->nbEBands;
OPUS_CLEAR((char*)&st->DECODER_RESET_START,
opus_custom_decoder_get_size(st->mode, st->channels)-
((char*)&st->DECODER_RESET_START - (char*)st));
for (i=0;i<2*st->mode->nbEBands;i++)
oldLogE[i]=oldLogE2[i]=-QCONST16(28.f,DB_SHIFT);
}
break;
case OPUS_GET_PITCH_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
if (value==NULL)
goto bad_arg;
*value = st->postfilter_period;
}
break;
#ifdef OPUS_BUILD
case CELT_GET_MODE_REQUEST:
{
const CELTMode ** value = va_arg(ap, const CELTMode**);
if (value==0)
goto bad_arg;
*value=st->mode;
}
break;
case CELT_SET_SIGNALLING_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->signalling = value;
}
break;
case OPUS_GET_FINAL_RANGE_REQUEST:
{
opus_uint32 * value = va_arg(ap, opus_uint32 *);
if (value==0)
goto bad_arg;
*value=st->rng;
}
break;
#endif
default:
goto bad_request;
}
va_end(ap);
return OPUS_OK;
bad_arg:
va_end(ap);
return OPUS_BAD_ARG;
bad_request:
va_end(ap);
return OPUS_UNIMPLEMENTED;
}
const char *opus_strerror(int error)
{
static const char * const error_strings[8] = {
"success",
"invalid argument",
"buffer too small",
"internal error",
"corrupted stream",
"request not implemented",
"invalid state",
"memory allocation failed"
};
if (error > 0 || error < -7)
return "unknown error";
else
return error_strings[-error];
}
const char *opus_get_version_string(void)
{
return "libopus " OPUS_VERSION
#ifdef FIXED_POINT
"-fixed"
#endif
#ifdef FUZZING
"-fuzzing"
#endif
;
}