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FFmpeg/libavcodec/opus/enc_psy.c
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Lynne 2e0a770b8e avcodec/opus/enc_psy: don't make the last frame silent at EOF 
816d74e0bb made frames without psy analysis at EOF silent. The frame
that follows the last input frame to flush its MDCT overlap is always
such a frame, so the last CELT_OVERLAP samples of the stream were lost
whenever it was needed, i.e. when the length of the stream is a
multiple of frame_size or less than CELT_OVERLAP samples short of one.
It was also coded as a one byte packet, which the MPEG-TS muxer
rejects.

Encode it like any other frame instead. Its psy analysis data is
zeroed, which leaves it with the default frame parameters.

Fixes: #24196
2026-09-25 02:13:39 +00:00

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/*
* Opus encoder
* Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <float.h>
#include "libavutil/mem.h"
#include "enc_psy.h"
#include "celt.h"
#include "pvq.h"
#include "tab.h"
#include "libavfilter/window_func.h"
static float pvq_band_cost(CeltPVQ *pvq, CeltFrame *f, OpusRangeCoder *rc, int band,
float *bits, float lambda)
{
int i, b = 0;
uint32_t cm[2] = { (1 << f->blocks) - 1, (1 << f->blocks) - 1 };
const int band_size = ff_celt_freq_range[band] << f->size;
float buf[176 * 2], lowband_scratch[176], norm1[176], norm2[176];
float dist, cost, err_x = 0.0f, err_y = 0.0f;
float *X = buf;
float *X_orig = f->block[0].coeffs + (ff_celt_freq_bands[band] << f->size);
float *Y = (f->channels == 2) ? &buf[176] : NULL;
float *Y_orig = f->block[1].coeffs + (ff_celt_freq_bands[band] << f->size);
OPUS_RC_CHECKPOINT_SPAWN(rc);
memcpy(X, X_orig, band_size*sizeof(float));
if (Y)
memcpy(Y, Y_orig, band_size*sizeof(float));
f->remaining2 = ((f->framebits << 3) - f->anticollapse_needed) - opus_rc_tell_frac(rc) - 1;
if (band <= f->coded_bands - 1) {
int curr_balance = f->remaining / FFMIN(3, f->coded_bands - band);
b = av_clip_uintp2(FFMIN(f->remaining2 + 1, f->pulses[band] + curr_balance), 14);
}
if (f->dual_stereo) {
pvq->quant_band(pvq, f, rc, band, X, NULL, band_size, b / 2, f->blocks, NULL,
f->size, norm1, 0, 1.0f, lowband_scratch, cm[0]);
pvq->quant_band(pvq, f, rc, band, Y, NULL, band_size, b / 2, f->blocks, NULL,
f->size, norm2, 0, 1.0f, lowband_scratch, cm[1]);
} else {
pvq->quant_band(pvq, f, rc, band, X, Y, band_size, b, f->blocks, NULL, f->size,
norm1, 0, 1.0f, lowband_scratch, cm[0] | cm[1]);
}
for (i = 0; i < band_size; i++) {
err_x += (X[i] - X_orig[i])*(X[i] - X_orig[i]);
if (Y)
err_y += (Y[i] - Y_orig[i])*(Y[i] - Y_orig[i]);
}
dist = sqrtf(err_x) + sqrtf(err_y);
cost = OPUS_RC_CHECKPOINT_BITS(rc)/8.0f;
*bits += cost;
OPUS_RC_CHECKPOINT_ROLLBACK(rc);
return lambda*dist*cost;
}
/* Populate metrics without taking into consideration neighbouring steps */
static void step_collect_psy_metrics(OpusPsyContext *s, int index)
{
int silence = 0, ch, i, j;
/* The MDCT analysis covers 2 * OPUS_BLOCK_SIZE(bsize_analysis) samples.
* Each bufqueue entry holds avctx->frame_size samples (120 historically,
* 960 after c3aea7628c for default settings). steps_per_half is how many
* bufqueue entries fill one MDCT half-window.
*
* bufqueue[0] is reserved for the previous packet's overlap (initially the
* empty padding frame). The audio that step N analyzes starts at
* bufqueue[index + 1]; bufqueue[index] is its preceding overlap. */
const int half_samples = OPUS_BLOCK_SIZE(s->bsize_analysis);
const int step_samples = s->avctx->frame_size;
const int steps_per_half = half_samples / step_samples;
OpusPsyStep *st = s->steps[index];
st->index = index;
for (ch = 0; ch < s->avctx->ch_layout.nb_channels; ch++) {
memset(s->scratch, 0, sizeof(float) * (half_samples << 1));
for (i = 1; i <= FFMIN(steps_per_half, index + 1); i++) {
const int offset = (steps_per_half - i) * step_samples;
AVFrame *cur = ff_bufqueue_peek(s->bufqueue, index + 1 - i);
memcpy(&s->scratch[offset], cur->extended_data[ch], cur->nb_samples*sizeof(float));
}
for (i = 0; i < steps_per_half; i++) {
if (index + 1 + i >= s->bufqueue->available)
break;
const int offset = (steps_per_half + i) * step_samples;
AVFrame *cur = ff_bufqueue_peek(s->bufqueue, index + 1 + i);
memcpy(&s->scratch[offset], cur->extended_data[ch], cur->nb_samples*sizeof(float));
}
s->dsp->vector_fmul(s->scratch, s->scratch, s->window[s->bsize_analysis],
(OPUS_BLOCK_SIZE(s->bsize_analysis) << 1));
s->mdct_fn[s->bsize_analysis](s->mdct[s->bsize_analysis], st->coeffs[ch],
s->scratch, sizeof(float));
for (i = 0; i < CELT_MAX_BANDS; i++)
st->bands[ch][i] = &st->coeffs[ch][ff_celt_freq_bands[i] << s->bsize_analysis];
}
for (ch = 0; ch < s->avctx->ch_layout.nb_channels; ch++) {
for (i = 0; i < CELT_MAX_BANDS; i++) {
float avg_c_s, energy = 0.0f, dist_dev = 0.0f;
const int range = ff_celt_freq_range[i] << s->bsize_analysis;
const float *coeffs = st->bands[ch][i];
for (j = 0; j < range; j++)
energy += coeffs[j]*coeffs[j];
st->energy[ch][i] += sqrtf(energy);
silence |= !!st->energy[ch][i];
avg_c_s = energy / range;
for (j = 0; j < range; j++) {
const float c_s = coeffs[j]*coeffs[j];
dist_dev += (avg_c_s - c_s)*(avg_c_s - c_s);
}
st->tone[ch][i] += sqrtf(dist_dev);
}
}
st->silence = !silence;
if (s->avctx->ch_layout.nb_channels > 1) {
for (i = 0; i < CELT_MAX_BANDS; i++) {
float incompat = 0.0f;
const float *coeffs1 = st->bands[0][i];
const float *coeffs2 = st->bands[1][i];
const int range = ff_celt_freq_range[i] << s->bsize_analysis;
for (j = 0; j < range; j++)
incompat += (coeffs1[j] - coeffs2[j])*(coeffs1[j] - coeffs2[j]);
st->stereo[i] = sqrtf(incompat);
}
}
for (ch = 0; ch < s->avctx->ch_layout.nb_channels; ch++) {
for (i = 0; i < CELT_MAX_BANDS; i++) {
OpusBandExcitation *ex = &s->ex[ch][i];
float bp_e = bessel_filter(&s->bfilter_lo[ch][i], st->energy[ch][i]);
bp_e = bessel_filter(&s->bfilter_hi[ch][i], bp_e);
bp_e *= bp_e;
if (bp_e > ex->excitation) {
st->change_amp[ch][i] = bp_e - ex->excitation;
st->total_change += st->change_amp[ch][i];
ex->excitation = ex->excitation_init = bp_e;
ex->excitation_dist = 0.0f;
}
if (ex->excitation > 0.0f) {
ex->excitation -= av_clipf((1/expf(ex->excitation_dist)), ex->excitation_init/20, ex->excitation_init/1.09);
ex->excitation = FFMAX(ex->excitation, 0.0f);
ex->excitation_dist += 1.0f;
}
}
}
}
static void search_for_change_points(OpusPsyContext *s, float tgt_change,
int offset_s, int offset_e, int resolution,
int level)
{
int i;
float c_change = 0.0f;
if ((offset_e - offset_s) <= resolution)
return;
for (i = offset_s; i < offset_e; i++) {
c_change += s->steps[i]->total_change;
if (c_change > tgt_change)
break;
}
if (i == offset_e)
return;
search_for_change_points(s, tgt_change / 2.0f, offset_s, i + 0, resolution, level + 1);
s->inflection_points[s->inflection_points_count++] = i;
search_for_change_points(s, tgt_change / 2.0f, i + 1, offset_e, resolution, level + 1);
}
static int flush_silent_frames(OpusPsyContext *s)
{
/* buffered_steps and silent_frames count psy steps, each of which is
* avctx->frame_size samples (120 historically, up to 960 after
* c3aea7628c). The CELT framesize fsize we pick must consume at least
* one psy step per emitted packet, otherwise postencode_update would
* compute steps_out = 0 and the psy state would stall while bufqueue
* and afq drain. */
const int step_samples = s->avctx->frame_size;
int fsize, silent_frames;
for (silent_frames = 0; silent_frames < s->buffered_steps; silent_frames++)
if (!s->steps[silent_frames]->silence)
break;
if (--silent_frames < 0)
return 0;
for (fsize = CELT_BLOCK_960; fsize > CELT_BLOCK_120; fsize--) {
const int packet_samples = OPUS_BLOCK_SIZE(fsize);
const int steps_per_packet = packet_samples / step_samples;
if (steps_per_packet < 1 || silent_frames < steps_per_packet)
continue;
/* 48 * CELT_SHORT_BLOCKSIZE = 5760 samples = 120 ms; matches the
* historical (48 >> fsize) cap for frame_size = 120. */
s->p.frames = FFMIN(silent_frames / steps_per_packet,
(48 * CELT_SHORT_BLOCKSIZE) / packet_samples);
s->p.framesize = fsize;
return 1;
}
return 0;
}
/* Main function which decides frame size and frames per current packet */
static void psy_output_groups(OpusPsyContext *s)
{
int max_delay_samples = (s->options->max_delay_ms*s->avctx->sample_rate)/1000;
int max_bsize = FFMIN(OPUS_SAMPLES_TO_BLOCK_SIZE(max_delay_samples), CELT_BLOCK_960);
/* These don't change for now */
s->p.mode = OPUS_MODE_CELT;
s->p.bandwidth = OPUS_BANDWIDTH_FULLBAND;
/* Flush silent frames ASAP */
if (s->steps[0]->silence && flush_silent_frames(s))
return;
s->p.framesize = FFMIN(max_bsize, CELT_BLOCK_960);
s->p.frames = 1;
}
int ff_opus_psy_process(OpusPsyContext *s, OpusPacketInfo *p)
{
int i;
float total_energy_change = 0.0f;
if (s->buffered_steps < s->max_steps && !s->eof) {
/* awin counts how many bufqueue entries fill one MDCT half-window.
* With frame_size=120 this is 8 (matches the historical 1 << bsize_analysis);
* with frame_size=960 it is 1, so we collect every call. */
const int awin = OPUS_BLOCK_SIZE(s->bsize_analysis) / s->avctx->frame_size;
if (++s->steps_to_process >= awin) {
step_collect_psy_metrics(s, s->buffered_steps - awin + 1);
s->steps_to_process = 0;
}
if ((++s->buffered_steps) < s->max_steps)
return 1;
}
for (i = 0; i < s->buffered_steps; i++)
total_energy_change += s->steps[i]->total_change;
search_for_change_points(s, total_energy_change / 2.0f, 0,
s->buffered_steps, 1, 0);
psy_output_groups(s);
p->frames = s->p.frames;
p->framesize = s->p.framesize;
p->mode = s->p.mode;
p->bandwidth = s->p.bandwidth;
return 0;
}
void ff_opus_psy_celt_frame_init(OpusPsyContext *s, CeltFrame *f, int index)
{
int i, neighbouring_points = 0, start_offset = 0;
int steps_per_frame = OPUS_BLOCK_SIZE(s->p.framesize) / s->avctx->frame_size;
int step_offset = steps_per_frame*index;
int silence = 1;
f->start_band = (s->p.mode == OPUS_MODE_HYBRID) ? 17 : 0;
f->end_band = ff_celt_band_end[s->p.bandwidth];
f->channels = s->avctx->ch_layout.nb_channels;
f->size = s->p.framesize;
for (i = 0; i < steps_per_frame; i++)
silence &= s->steps[index * steps_per_frame + i]->silence;
f->silence = silence;
if (f->silence) {
/* Explicitly signal silence in a 2 byte frame, like libopus does.
* A zero length frame would instead signal a lost frame to decoders,
* which conceal it by extrapolating the preceding audio. */
f->framebits = 16;
f->intensity_stereo = f->end_band; /* Read by postencode_update for avg_is_band */
return;
}
for (i = 0; i < s->inflection_points_count; i++) {
if (s->inflection_points[i] >= step_offset) {
start_offset = i;
break;
}
}
for (i = start_offset; i < FFMIN(steps_per_frame, s->inflection_points_count - start_offset); i++) {
if (s->inflection_points[i] < (step_offset + steps_per_frame)) {
neighbouring_points++;
}
}
/* Transient flagging */
f->transient = neighbouring_points > 0;
f->blocks = f->transient ? OPUS_BLOCK_SIZE(s->p.framesize)/CELT_OVERLAP : 1;
/* Some sane defaults */
f->pfilter = 0;
f->pf_gain = 0.5f;
f->pf_octave = 2;
f->pf_period = 1;
f->pf_tapset = 2;
/* More sane defaults */
f->tf_select = 0;
f->anticollapse = 1;
f->alloc_trim = 5;
f->skip_band_floor = f->end_band;
f->intensity_stereo = f->end_band;
f->dual_stereo = 0;
f->spread = CELT_SPREAD_NORMAL;
memset(f->tf_change, 0, sizeof(int)*CELT_MAX_BANDS);
memset(f->alloc_boost, 0, sizeof(int)*CELT_MAX_BANDS);
}
static void celt_gauge_psy_weight(OpusPsyContext *s, OpusPsyStep **start,
CeltFrame *f_out)
{
int i, f, ch;
int frame_size = OPUS_BLOCK_SIZE(s->p.framesize);
int steps_per_frame = frame_size / s->avctx->frame_size;
float rate, frame_bits = 0;
/* Used for the global ROTATE flag */
float tonal = 0.0f;
/* Pseudo-weights */
float band_score[CELT_MAX_BANDS] = { 0 };
float max_score = 1.0f;
/* Pass one - one loop around each band, computing unquant stuff */
for (i = 0; i < CELT_MAX_BANDS; i++) {
float weight = 0.0f;
float tonal_contrib = 0.0f;
for (f = 0; f < steps_per_frame; f++) {
weight = start[f]->stereo[i];
for (ch = 0; ch < s->avctx->ch_layout.nb_channels; ch++) {
weight += start[f]->change_amp[ch][i] + start[f]->tone[ch][i] + start[f]->energy[ch][i];
tonal_contrib += start[f]->tone[ch][i];
}
}
tonal += tonal_contrib;
band_score[i] = weight;
}
tonal /= (float)CELT_MAX_BANDS;
for (i = 0; i < CELT_MAX_BANDS; i++) {
if (band_score[i] > max_score)
max_score = band_score[i];
}
for (i = 0; i < CELT_MAX_BANDS; i++) {
f_out->alloc_boost[i] = (int)((band_score[i]/max_score)*3.0f);
//TODO: implements frame_bits adjustment.
}
tonal /= 1333136.0f;
f_out->spread = av_clip_uintp2(lrintf(tonal), 2);
rate = ((float)s->avctx->bit_rate) + frame_bits*frame_size*16;
rate *= s->lambda;
rate /= s->avctx->sample_rate/frame_size;
f_out->framebits = lrintf(rate);
f_out->framebits = FFMIN(f_out->framebits, OPUS_MAX_FRAME_SIZE * 8);
f_out->framebits = FFALIGN(f_out->framebits, 8);
}
static int bands_dist(OpusPsyContext *s, CeltFrame *f, float *total_dist)
{
int i, tdist = 0.0f;
OpusRangeCoder dump;
ff_opus_rc_enc_init(&dump);
ff_celt_bitalloc(f, &dump, 1);
for (i = 0; i < CELT_MAX_BANDS; i++) {
float bits = 0.0f;
float dist = pvq_band_cost(f->pvq, f, &dump, i, &bits, s->lambda);
tdist += dist;
}
*total_dist = tdist;
return 0;
}
static void celt_search_for_dual_stereo(OpusPsyContext *s, CeltFrame *f)
{
float td1, td2;
f->dual_stereo = 0;
if (s->avctx->ch_layout.nb_channels < 2)
return;
bands_dist(s, f, &td1);
f->dual_stereo = 1;
bands_dist(s, f, &td2);
f->dual_stereo = td2 < td1;
s->dual_stereo_used += td2 < td1;
}
static void celt_search_for_intensity(OpusPsyContext *s, CeltFrame *f)
{
int i, best_band = CELT_MAX_BANDS - 1;
float dist, best_dist = FLT_MAX;
/* TODO: fix, make some heuristic up here using the lambda value */
float end_band = 0;
if (s->avctx->ch_layout.nb_channels < 2)
return;
for (i = f->end_band; i >= end_band; i--) {
f->intensity_stereo = i;
bands_dist(s, f, &dist);
if (best_dist > dist) {
best_dist = dist;
best_band = i;
}
}
f->intensity_stereo = best_band;
s->avg_is_band = (s->avg_is_band + f->intensity_stereo)/2.0f;
}
static int celt_search_for_tf(OpusPsyContext *s, OpusPsyStep **start, CeltFrame *f)
{
int i, j, k, cway, config[2][CELT_MAX_BANDS] = { { 0 } };
int steps_per_frame = OPUS_BLOCK_SIZE(f->size) / s->avctx->frame_size;
float score[2] = { 0 };
for (cway = 0; cway < 2; cway++) {
int mag[2];
int base = f->transient ? 120 : 960;
for (i = 0; i < 2; i++) {
int c = ff_celt_tf_select[f->size][f->transient][cway][i];
mag[i] = c < 0 ? base >> FFABS(c) : base << FFABS(c);
}
for (i = 0; i < CELT_MAX_BANDS; i++) {
float iscore0 = 0.0f;
float iscore1 = 0.0f;
for (j = 0; j < steps_per_frame; j++) {
for (k = 0; k < s->avctx->ch_layout.nb_channels; k++) {
iscore0 += start[j]->tone[k][i]*start[j]->change_amp[k][i]/mag[0];
iscore1 += start[j]->tone[k][i]*start[j]->change_amp[k][i]/mag[1];
}
}
config[cway][i] = FFABS(iscore0 - 1.0f) < FFABS(iscore1 - 1.0f);
score[cway] += config[cway][i] ? iscore1 : iscore0;
}
}
f->tf_select = score[0] < score[1];
memcpy(f->tf_change, config[f->tf_select], sizeof(int)*CELT_MAX_BANDS);
return 0;
}
int ff_opus_psy_celt_frame_process(OpusPsyContext *s, CeltFrame *f, int index)
{
int start_transient_flag = f->transient;
int steps_per_frame = OPUS_BLOCK_SIZE(s->p.framesize) / s->avctx->frame_size;
OpusPsyStep **start = &s->steps[index * steps_per_frame];
if (f->silence)
return 0;
celt_gauge_psy_weight(s, start, f);
celt_search_for_intensity(s, f);
celt_search_for_dual_stereo(s, f);
celt_search_for_tf(s, start, f);
if (f->transient != start_transient_flag) {
f->blocks = f->transient ? OPUS_BLOCK_SIZE(s->p.framesize)/CELT_OVERLAP : 1;
return 1;
}
return 0;
}
void ff_opus_psy_postencode_update(OpusPsyContext *s, CeltFrame *f)
{
int i, frame_size = OPUS_BLOCK_SIZE(s->p.framesize);
int steps_out = s->p.frames*(frame_size/s->avctx->frame_size);
void *tmp[FF_BUFQUEUE_SIZE];
float ideal_fbits;
for (i = 0; i < steps_out; i++)
memset(s->steps[i], 0, sizeof(OpusPsyStep));
for (i = 0; i < s->max_steps; i++)
tmp[i] = s->steps[i];
for (i = 0; i < s->max_steps; i++) {
const int i_new = i - steps_out;
s->steps[i_new < 0 ? s->max_steps + i_new : i_new] = tmp[i];
}
for (i = steps_out; i < s->buffered_steps; i++)
s->steps[i]->index -= steps_out;
ideal_fbits = s->avctx->bit_rate/(s->avctx->sample_rate/frame_size);
for (i = 0; i < s->p.frames; i++) {
s->avg_is_band += f[i].intensity_stereo;
if (!f[i].silence && f[i].framebits > 0)
s->lambda *= ideal_fbits / f[i].framebits;
}
s->avg_is_band /= (s->p.frames + 1);
s->steps_to_process = 0;
/* At EOF, one more frame than there are psy steps is encoded to flush
* the last frame's MDCT overlap */
s->buffered_steps = FFMAX(s->buffered_steps - steps_out, 0);
s->total_packets_out += s->p.frames;
s->inflection_points_count = 0;
}
av_cold int ff_opus_psy_init(OpusPsyContext *s, AVCodecContext *avctx,
struct FFBufQueue *bufqueue, OpusEncOptions *options)
{
int i, ch, ret;
s->lambda = 1.0f;
s->options = options;
s->avctx = avctx;
s->bufqueue = bufqueue;
s->max_steps = ceilf(s->options->max_delay_ms * avctx->sample_rate /
(1000.0f * avctx->frame_size));
s->bsize_analysis = CELT_BLOCK_960;
s->avg_is_band = CELT_MAX_BANDS - 1;
s->inflection_points_count = 0;
s->inflection_points = av_mallocz(sizeof(*s->inflection_points)*s->max_steps);
if (!s->inflection_points) {
ret = AVERROR(ENOMEM);
goto fail;
}
s->dsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!s->dsp) {
ret = AVERROR(ENOMEM);
goto fail;
}
for (ch = 0; ch < s->avctx->ch_layout.nb_channels; ch++) {
for (i = 0; i < CELT_MAX_BANDS; i++) {
bessel_init(&s->bfilter_hi[ch][i], 1.0f, 19.0f, 100.0f, 1);
bessel_init(&s->bfilter_lo[ch][i], 1.0f, 20.0f, 100.0f, 0);
}
}
for (i = 0; i < s->max_steps; i++) {
s->steps[i] = av_mallocz(sizeof(OpusPsyStep));
if (!s->steps[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
}
for (i = 0; i < CELT_BLOCK_NB; i++) {
float tmp;
const int len = OPUS_BLOCK_SIZE(i);
const float scale = 68 << (CELT_BLOCK_NB - 1 - i);
s->window[i] = av_malloc(2*len*sizeof(float));
if (!s->window[i]) {
ret = AVERROR(ENOMEM);
goto fail;
}
generate_window_func(s->window[i], 2*len, WFUNC_SINE, &tmp);
ret = av_tx_init(&s->mdct[i], &s->mdct_fn[i], AV_TX_FLOAT_MDCT,
0, 15 << (i + 3), &scale, 0);
if (ret < 0)
goto fail;
}
return 0;
fail:
av_freep(&s->inflection_points);
av_freep(&s->dsp);
for (i = 0; i < CELT_BLOCK_NB; i++) {
av_tx_uninit(&s->mdct[i]);
av_freep(&s->window[i]);
}
for (i = 0; i < s->max_steps; i++)
av_freep(&s->steps[i]);
return ret;
}
void ff_opus_psy_signal_eof(OpusPsyContext *s)
{
s->eof = 1;
}
av_cold int ff_opus_psy_end(OpusPsyContext *s)
{
int i;
av_freep(&s->inflection_points);
av_freep(&s->dsp);
for (i = 0; i < CELT_BLOCK_NB; i++) {
av_tx_uninit(&s->mdct[i]);
av_freep(&s->window[i]);
}
for (i = 0; i < s->max_steps; i++)
av_freep(&s->steps[i]);
av_log(s->avctx, AV_LOG_INFO, "Average Intensity Stereo band: %0.1f\n", s->avg_is_band);
av_log(s->avctx, AV_LOG_INFO, "Dual Stereo used: %0.2f%%\n", ((float)s->dual_stereo_used/s->total_packets_out)*100.0f);
return 0;
}
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