741 lines
26 KiB
C
741 lines
26 KiB
C
/*
|
|
* 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 "opusenc.h"
|
|
#include "opus_pvq.h"
|
|
#include "opusenc_psy.h"
|
|
#include "opustab.h"
|
|
|
|
#include "libavutil/float_dsp.h"
|
|
#include "libavutil/mem_internal.h"
|
|
#include "libavutil/opt.h"
|
|
#include "internal.h"
|
|
#include "bytestream.h"
|
|
#include "audio_frame_queue.h"
|
|
|
|
typedef struct OpusEncContext {
|
|
AVClass *av_class;
|
|
OpusEncOptions options;
|
|
OpusPsyContext psyctx;
|
|
AVCodecContext *avctx;
|
|
AudioFrameQueue afq;
|
|
AVFloatDSPContext *dsp;
|
|
MDCT15Context *mdct[CELT_BLOCK_NB];
|
|
CeltPVQ *pvq;
|
|
struct FFBufQueue bufqueue;
|
|
|
|
uint8_t enc_id[64];
|
|
int enc_id_bits;
|
|
|
|
OpusPacketInfo packet;
|
|
|
|
int channels;
|
|
|
|
CeltFrame *frame;
|
|
OpusRangeCoder *rc;
|
|
|
|
/* Actual energy the decoder will have */
|
|
float last_quantized_energy[OPUS_MAX_CHANNELS][CELT_MAX_BANDS];
|
|
|
|
DECLARE_ALIGNED(32, float, scratch)[2048];
|
|
} OpusEncContext;
|
|
|
|
static void opus_write_extradata(AVCodecContext *avctx)
|
|
{
|
|
uint8_t *bs = avctx->extradata;
|
|
|
|
bytestream_put_buffer(&bs, "OpusHead", 8);
|
|
bytestream_put_byte (&bs, 0x1);
|
|
bytestream_put_byte (&bs, avctx->channels);
|
|
bytestream_put_le16 (&bs, avctx->initial_padding);
|
|
bytestream_put_le32 (&bs, avctx->sample_rate);
|
|
bytestream_put_le16 (&bs, 0x0);
|
|
bytestream_put_byte (&bs, 0x0); /* Default layout */
|
|
}
|
|
|
|
static int opus_gen_toc(OpusEncContext *s, uint8_t *toc, int *size, int *fsize_needed)
|
|
{
|
|
int tmp = 0x0, extended_toc = 0;
|
|
static const int toc_cfg[][OPUS_MODE_NB][OPUS_BANDWITH_NB] = {
|
|
/* Silk Hybrid Celt Layer */
|
|
/* NB MB WB SWB FB NB MB WB SWB FB NB MB WB SWB FB Bandwidth */
|
|
{ { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 }, { 17, 0, 21, 25, 29 } }, /* 2.5 ms */
|
|
{ { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 }, { 18, 0, 22, 26, 30 } }, /* 5 ms */
|
|
{ { 1, 5, 9, 0, 0 }, { 0, 0, 0, 13, 15 }, { 19, 0, 23, 27, 31 } }, /* 10 ms */
|
|
{ { 2, 6, 10, 0, 0 }, { 0, 0, 0, 14, 16 }, { 20, 0, 24, 28, 32 } }, /* 20 ms */
|
|
{ { 3, 7, 11, 0, 0 }, { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 } }, /* 40 ms */
|
|
{ { 4, 8, 12, 0, 0 }, { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 } }, /* 60 ms */
|
|
};
|
|
int cfg = toc_cfg[s->packet.framesize][s->packet.mode][s->packet.bandwidth];
|
|
*fsize_needed = 0;
|
|
if (!cfg)
|
|
return 1;
|
|
if (s->packet.frames == 2) { /* 2 packets */
|
|
if (s->frame[0].framebits == s->frame[1].framebits) { /* same size */
|
|
tmp = 0x1;
|
|
} else { /* different size */
|
|
tmp = 0x2;
|
|
*fsize_needed = 1; /* put frame sizes in the packet */
|
|
}
|
|
} else if (s->packet.frames > 2) {
|
|
tmp = 0x3;
|
|
extended_toc = 1;
|
|
}
|
|
tmp |= (s->channels > 1) << 2; /* Stereo or mono */
|
|
tmp |= (cfg - 1) << 3; /* codec configuration */
|
|
*toc++ = tmp;
|
|
if (extended_toc) {
|
|
for (int i = 0; i < (s->packet.frames - 1); i++)
|
|
*fsize_needed |= (s->frame[i].framebits != s->frame[i + 1].framebits);
|
|
tmp = (*fsize_needed) << 7; /* vbr flag */
|
|
tmp |= (0) << 6; /* padding flag */
|
|
tmp |= s->packet.frames;
|
|
*toc++ = tmp;
|
|
}
|
|
*size = 1 + extended_toc;
|
|
return 0;
|
|
}
|
|
|
|
static void celt_frame_setup_input(OpusEncContext *s, CeltFrame *f)
|
|
{
|
|
AVFrame *cur = NULL;
|
|
const int subframesize = s->avctx->frame_size;
|
|
int subframes = OPUS_BLOCK_SIZE(s->packet.framesize) / subframesize;
|
|
|
|
cur = ff_bufqueue_get(&s->bufqueue);
|
|
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *b = &f->block[ch];
|
|
const void *input = cur->extended_data[ch];
|
|
size_t bps = av_get_bytes_per_sample(cur->format);
|
|
memcpy(b->overlap, input, bps*cur->nb_samples);
|
|
}
|
|
|
|
av_frame_free(&cur);
|
|
|
|
for (int sf = 0; sf < subframes; sf++) {
|
|
if (sf != (subframes - 1))
|
|
cur = ff_bufqueue_get(&s->bufqueue);
|
|
else
|
|
cur = ff_bufqueue_peek(&s->bufqueue, 0);
|
|
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *b = &f->block[ch];
|
|
const void *input = cur->extended_data[ch];
|
|
const size_t bps = av_get_bytes_per_sample(cur->format);
|
|
const size_t left = (subframesize - cur->nb_samples)*bps;
|
|
const size_t len = FFMIN(subframesize, cur->nb_samples)*bps;
|
|
memcpy(&b->samples[sf*subframesize], input, len);
|
|
memset(&b->samples[cur->nb_samples], 0, left);
|
|
}
|
|
|
|
/* Last frame isn't popped off and freed yet - we need it for overlap */
|
|
if (sf != (subframes - 1))
|
|
av_frame_free(&cur);
|
|
}
|
|
}
|
|
|
|
/* Apply the pre emphasis filter */
|
|
static void celt_apply_preemph_filter(OpusEncContext *s, CeltFrame *f)
|
|
{
|
|
const int subframesize = s->avctx->frame_size;
|
|
const int subframes = OPUS_BLOCK_SIZE(s->packet.framesize) / subframesize;
|
|
|
|
/* Filter overlap */
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *b = &f->block[ch];
|
|
float m = b->emph_coeff;
|
|
for (int i = 0; i < CELT_OVERLAP; i++) {
|
|
float sample = b->overlap[i];
|
|
b->overlap[i] = sample - m;
|
|
m = sample * CELT_EMPH_COEFF;
|
|
}
|
|
b->emph_coeff = m;
|
|
}
|
|
|
|
/* Filter the samples but do not update the last subframe's coeff - overlap ^^^ */
|
|
for (int sf = 0; sf < subframes; sf++) {
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *b = &f->block[ch];
|
|
float m = b->emph_coeff;
|
|
for (int i = 0; i < subframesize; i++) {
|
|
float sample = b->samples[sf*subframesize + i];
|
|
b->samples[sf*subframesize + i] = sample - m;
|
|
m = sample * CELT_EMPH_COEFF;
|
|
}
|
|
if (sf != (subframes - 1))
|
|
b->emph_coeff = m;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Create the window and do the mdct */
|
|
static void celt_frame_mdct(OpusEncContext *s, CeltFrame *f)
|
|
{
|
|
float *win = s->scratch, *temp = s->scratch + 1920;
|
|
|
|
if (f->transient) {
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *b = &f->block[ch];
|
|
float *src1 = b->overlap;
|
|
for (int t = 0; t < f->blocks; t++) {
|
|
float *src2 = &b->samples[CELT_OVERLAP*t];
|
|
s->dsp->vector_fmul(win, src1, ff_celt_window, 128);
|
|
s->dsp->vector_fmul_reverse(&win[CELT_OVERLAP], src2,
|
|
ff_celt_window - 8, 128);
|
|
src1 = src2;
|
|
s->mdct[0]->mdct(s->mdct[0], b->coeffs + t, win, f->blocks);
|
|
}
|
|
}
|
|
} else {
|
|
int blk_len = OPUS_BLOCK_SIZE(f->size), wlen = OPUS_BLOCK_SIZE(f->size + 1);
|
|
int rwin = blk_len - CELT_OVERLAP, lap_dst = (wlen - blk_len - CELT_OVERLAP) >> 1;
|
|
memset(win, 0, wlen*sizeof(float));
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *b = &f->block[ch];
|
|
|
|
/* Overlap */
|
|
s->dsp->vector_fmul(temp, b->overlap, ff_celt_window, 128);
|
|
memcpy(win + lap_dst, temp, CELT_OVERLAP*sizeof(float));
|
|
|
|
/* Samples, flat top window */
|
|
memcpy(&win[lap_dst + CELT_OVERLAP], b->samples, rwin*sizeof(float));
|
|
|
|
/* Samples, windowed */
|
|
s->dsp->vector_fmul_reverse(temp, b->samples + rwin,
|
|
ff_celt_window - 8, 128);
|
|
memcpy(win + lap_dst + blk_len, temp, CELT_OVERLAP*sizeof(float));
|
|
|
|
s->mdct[f->size]->mdct(s->mdct[f->size], b->coeffs, win, 1);
|
|
}
|
|
}
|
|
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *block = &f->block[ch];
|
|
for (int i = 0; i < CELT_MAX_BANDS; i++) {
|
|
float ener = 0.0f;
|
|
int band_offset = ff_celt_freq_bands[i] << f->size;
|
|
int band_size = ff_celt_freq_range[i] << f->size;
|
|
float *coeffs = &block->coeffs[band_offset];
|
|
|
|
for (int j = 0; j < band_size; j++)
|
|
ener += coeffs[j]*coeffs[j];
|
|
|
|
block->lin_energy[i] = sqrtf(ener) + FLT_EPSILON;
|
|
ener = 1.0f/block->lin_energy[i];
|
|
|
|
for (int j = 0; j < band_size; j++)
|
|
coeffs[j] *= ener;
|
|
|
|
block->energy[i] = log2f(block->lin_energy[i]) - ff_celt_mean_energy[i];
|
|
|
|
/* CELT_ENERGY_SILENCE is what the decoder uses and its not -infinity */
|
|
block->energy[i] = FFMAX(block->energy[i], CELT_ENERGY_SILENCE);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void celt_enc_tf(CeltFrame *f, OpusRangeCoder *rc)
|
|
{
|
|
int tf_select = 0, diff = 0, tf_changed = 0, tf_select_needed;
|
|
int bits = f->transient ? 2 : 4;
|
|
|
|
tf_select_needed = ((f->size && (opus_rc_tell(rc) + bits + 1) <= f->framebits));
|
|
|
|
for (int i = f->start_band; i < f->end_band; i++) {
|
|
if ((opus_rc_tell(rc) + bits + tf_select_needed) <= f->framebits) {
|
|
const int tbit = (diff ^ 1) == f->tf_change[i];
|
|
ff_opus_rc_enc_log(rc, tbit, bits);
|
|
diff ^= tbit;
|
|
tf_changed |= diff;
|
|
}
|
|
bits = f->transient ? 4 : 5;
|
|
}
|
|
|
|
if (tf_select_needed && ff_celt_tf_select[f->size][f->transient][0][tf_changed] !=
|
|
ff_celt_tf_select[f->size][f->transient][1][tf_changed]) {
|
|
ff_opus_rc_enc_log(rc, f->tf_select, 1);
|
|
tf_select = f->tf_select;
|
|
}
|
|
|
|
for (int i = f->start_band; i < f->end_band; i++)
|
|
f->tf_change[i] = ff_celt_tf_select[f->size][f->transient][tf_select][f->tf_change[i]];
|
|
}
|
|
|
|
static void celt_enc_quant_pfilter(OpusRangeCoder *rc, CeltFrame *f)
|
|
{
|
|
float gain = f->pf_gain;
|
|
int txval, octave = f->pf_octave, period = f->pf_period, tapset = f->pf_tapset;
|
|
|
|
ff_opus_rc_enc_log(rc, f->pfilter, 1);
|
|
if (!f->pfilter)
|
|
return;
|
|
|
|
/* Octave */
|
|
txval = FFMIN(octave, 6);
|
|
ff_opus_rc_enc_uint(rc, txval, 6);
|
|
octave = txval;
|
|
/* Period */
|
|
txval = av_clip(period - (16 << octave) + 1, 0, (1 << (4 + octave)) - 1);
|
|
ff_opus_rc_put_raw(rc, period, 4 + octave);
|
|
period = txval + (16 << octave) - 1;
|
|
/* Gain */
|
|
txval = FFMIN(((int)(gain / 0.09375f)) - 1, 7);
|
|
ff_opus_rc_put_raw(rc, txval, 3);
|
|
gain = 0.09375f * (txval + 1);
|
|
/* Tapset */
|
|
if ((opus_rc_tell(rc) + 2) <= f->framebits)
|
|
ff_opus_rc_enc_cdf(rc, tapset, ff_celt_model_tapset);
|
|
else
|
|
tapset = 0;
|
|
/* Finally create the coeffs */
|
|
for (int i = 0; i < 2; i++) {
|
|
CeltBlock *block = &f->block[i];
|
|
|
|
block->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD);
|
|
block->pf_gains_new[0] = gain * ff_celt_postfilter_taps[tapset][0];
|
|
block->pf_gains_new[1] = gain * ff_celt_postfilter_taps[tapset][1];
|
|
block->pf_gains_new[2] = gain * ff_celt_postfilter_taps[tapset][2];
|
|
}
|
|
}
|
|
|
|
static void exp_quant_coarse(OpusRangeCoder *rc, CeltFrame *f,
|
|
float last_energy[][CELT_MAX_BANDS], int intra)
|
|
{
|
|
float alpha, beta, prev[2] = { 0, 0 };
|
|
const uint8_t *pmod = ff_celt_coarse_energy_dist[f->size][intra];
|
|
|
|
/* Inter is really just differential coding */
|
|
if (opus_rc_tell(rc) + 3 <= f->framebits)
|
|
ff_opus_rc_enc_log(rc, intra, 3);
|
|
else
|
|
intra = 0;
|
|
|
|
if (intra) {
|
|
alpha = 0.0f;
|
|
beta = 1.0f - (4915.0f/32768.0f);
|
|
} else {
|
|
alpha = ff_celt_alpha_coef[f->size];
|
|
beta = ff_celt_beta_coef[f->size];
|
|
}
|
|
|
|
for (int i = f->start_band; i < f->end_band; i++) {
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *block = &f->block[ch];
|
|
const int left = f->framebits - opus_rc_tell(rc);
|
|
const float last = FFMAX(-9.0f, last_energy[ch][i]);
|
|
float diff = block->energy[i] - prev[ch] - last*alpha;
|
|
int q_en = lrintf(diff);
|
|
if (left >= 15) {
|
|
ff_opus_rc_enc_laplace(rc, &q_en, pmod[i << 1] << 7, pmod[(i << 1) + 1] << 6);
|
|
} else if (left >= 2) {
|
|
q_en = av_clip(q_en, -1, 1);
|
|
ff_opus_rc_enc_cdf(rc, 2*q_en + 3*(q_en < 0), ff_celt_model_energy_small);
|
|
} else if (left >= 1) {
|
|
q_en = av_clip(q_en, -1, 0);
|
|
ff_opus_rc_enc_log(rc, (q_en & 1), 1);
|
|
} else q_en = -1;
|
|
|
|
block->error_energy[i] = q_en - diff;
|
|
prev[ch] += beta * q_en;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void celt_quant_coarse(CeltFrame *f, OpusRangeCoder *rc,
|
|
float last_energy[][CELT_MAX_BANDS])
|
|
{
|
|
uint32_t inter, intra;
|
|
OPUS_RC_CHECKPOINT_SPAWN(rc);
|
|
|
|
exp_quant_coarse(rc, f, last_energy, 1);
|
|
intra = OPUS_RC_CHECKPOINT_BITS(rc);
|
|
|
|
OPUS_RC_CHECKPOINT_ROLLBACK(rc);
|
|
|
|
exp_quant_coarse(rc, f, last_energy, 0);
|
|
inter = OPUS_RC_CHECKPOINT_BITS(rc);
|
|
|
|
if (inter > intra) { /* Unlikely */
|
|
OPUS_RC_CHECKPOINT_ROLLBACK(rc);
|
|
exp_quant_coarse(rc, f, last_energy, 1);
|
|
}
|
|
}
|
|
|
|
static void celt_quant_fine(CeltFrame *f, OpusRangeCoder *rc)
|
|
{
|
|
for (int i = f->start_band; i < f->end_band; i++) {
|
|
if (!f->fine_bits[i])
|
|
continue;
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *block = &f->block[ch];
|
|
int quant, lim = (1 << f->fine_bits[i]);
|
|
float offset, diff = 0.5f - block->error_energy[i];
|
|
quant = av_clip(floor(diff*lim), 0, lim - 1);
|
|
ff_opus_rc_put_raw(rc, quant, f->fine_bits[i]);
|
|
offset = 0.5f - ((quant + 0.5f) * (1 << (14 - f->fine_bits[i])) / 16384.0f);
|
|
block->error_energy[i] -= offset;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void celt_quant_final(OpusEncContext *s, OpusRangeCoder *rc, CeltFrame *f)
|
|
{
|
|
for (int priority = 0; priority < 2; priority++) {
|
|
for (int i = f->start_band; i < f->end_band && (f->framebits - opus_rc_tell(rc)) >= f->channels; i++) {
|
|
if (f->fine_priority[i] != priority || f->fine_bits[i] >= CELT_MAX_FINE_BITS)
|
|
continue;
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *block = &f->block[ch];
|
|
const float err = block->error_energy[i];
|
|
const float offset = 0.5f * (1 << (14 - f->fine_bits[i] - 1)) / 16384.0f;
|
|
const int sign = FFABS(err + offset) < FFABS(err - offset);
|
|
ff_opus_rc_put_raw(rc, sign, 1);
|
|
block->error_energy[i] -= offset*(1 - 2*sign);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void celt_encode_frame(OpusEncContext *s, OpusRangeCoder *rc,
|
|
CeltFrame *f, int index)
|
|
{
|
|
ff_opus_rc_enc_init(rc);
|
|
|
|
ff_opus_psy_celt_frame_init(&s->psyctx, f, index);
|
|
|
|
celt_frame_setup_input(s, f);
|
|
|
|
if (f->silence) {
|
|
if (f->framebits >= 16)
|
|
ff_opus_rc_enc_log(rc, 1, 15); /* Silence (if using explicit singalling) */
|
|
for (int ch = 0; ch < s->channels; ch++)
|
|
memset(s->last_quantized_energy[ch], 0.0f, sizeof(float)*CELT_MAX_BANDS);
|
|
return;
|
|
}
|
|
|
|
/* Filters */
|
|
celt_apply_preemph_filter(s, f);
|
|
if (f->pfilter) {
|
|
ff_opus_rc_enc_log(rc, 0, 15);
|
|
celt_enc_quant_pfilter(rc, f);
|
|
}
|
|
|
|
/* Transform */
|
|
celt_frame_mdct(s, f);
|
|
|
|
/* Need to handle transient/non-transient switches at any point during analysis */
|
|
while (ff_opus_psy_celt_frame_process(&s->psyctx, f, index))
|
|
celt_frame_mdct(s, f);
|
|
|
|
ff_opus_rc_enc_init(rc);
|
|
|
|
/* Silence */
|
|
ff_opus_rc_enc_log(rc, 0, 15);
|
|
|
|
/* Pitch filter */
|
|
if (!f->start_band && opus_rc_tell(rc) + 16 <= f->framebits)
|
|
celt_enc_quant_pfilter(rc, f);
|
|
|
|
/* Transient flag */
|
|
if (f->size && opus_rc_tell(rc) + 3 <= f->framebits)
|
|
ff_opus_rc_enc_log(rc, f->transient, 3);
|
|
|
|
/* Main encoding */
|
|
celt_quant_coarse (f, rc, s->last_quantized_energy);
|
|
celt_enc_tf (f, rc);
|
|
ff_celt_bitalloc (f, rc, 1);
|
|
celt_quant_fine (f, rc);
|
|
ff_celt_quant_bands(f, rc);
|
|
|
|
/* Anticollapse bit */
|
|
if (f->anticollapse_needed)
|
|
ff_opus_rc_put_raw(rc, f->anticollapse, 1);
|
|
|
|
/* Final per-band energy adjustments from leftover bits */
|
|
celt_quant_final(s, rc, f);
|
|
|
|
for (int ch = 0; ch < f->channels; ch++) {
|
|
CeltBlock *block = &f->block[ch];
|
|
for (int i = 0; i < CELT_MAX_BANDS; i++)
|
|
s->last_quantized_energy[ch][i] = block->energy[i] + block->error_energy[i];
|
|
}
|
|
}
|
|
|
|
static inline int write_opuslacing(uint8_t *dst, int v)
|
|
{
|
|
dst[0] = FFMIN(v - FFALIGN(v - 255, 4), v);
|
|
dst[1] = v - dst[0] >> 2;
|
|
return 1 + (v >= 252);
|
|
}
|
|
|
|
static void opus_packet_assembler(OpusEncContext *s, AVPacket *avpkt)
|
|
{
|
|
int offset, fsize_needed;
|
|
|
|
/* Write toc */
|
|
opus_gen_toc(s, avpkt->data, &offset, &fsize_needed);
|
|
|
|
/* Frame sizes if needed */
|
|
if (fsize_needed) {
|
|
for (int i = 0; i < s->packet.frames - 1; i++) {
|
|
offset += write_opuslacing(avpkt->data + offset,
|
|
s->frame[i].framebits >> 3);
|
|
}
|
|
}
|
|
|
|
/* Packets */
|
|
for (int i = 0; i < s->packet.frames; i++) {
|
|
ff_opus_rc_enc_end(&s->rc[i], avpkt->data + offset,
|
|
s->frame[i].framebits >> 3);
|
|
offset += s->frame[i].framebits >> 3;
|
|
}
|
|
|
|
avpkt->size = offset;
|
|
}
|
|
|
|
/* Used as overlap for the first frame and padding for the last encoded packet */
|
|
static AVFrame *spawn_empty_frame(OpusEncContext *s)
|
|
{
|
|
AVFrame *f = av_frame_alloc();
|
|
if (!f)
|
|
return NULL;
|
|
f->format = s->avctx->sample_fmt;
|
|
f->nb_samples = s->avctx->frame_size;
|
|
f->channel_layout = s->avctx->channel_layout;
|
|
if (av_frame_get_buffer(f, 4)) {
|
|
av_frame_free(&f);
|
|
return NULL;
|
|
}
|
|
for (int i = 0; i < s->channels; i++) {
|
|
size_t bps = av_get_bytes_per_sample(f->format);
|
|
memset(f->extended_data[i], 0, bps*f->nb_samples);
|
|
}
|
|
return f;
|
|
}
|
|
|
|
static int opus_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
|
|
const AVFrame *frame, int *got_packet_ptr)
|
|
{
|
|
OpusEncContext *s = avctx->priv_data;
|
|
int ret, frame_size, alloc_size = 0;
|
|
|
|
if (frame) { /* Add new frame to queue */
|
|
if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
|
|
return ret;
|
|
ff_bufqueue_add(avctx, &s->bufqueue, av_frame_clone(frame));
|
|
} else {
|
|
ff_opus_psy_signal_eof(&s->psyctx);
|
|
if (!s->afq.remaining_samples || !avctx->frame_number)
|
|
return 0; /* We've been flushed and there's nothing left to encode */
|
|
}
|
|
|
|
/* Run the psychoacoustic system */
|
|
if (ff_opus_psy_process(&s->psyctx, &s->packet))
|
|
return 0;
|
|
|
|
frame_size = OPUS_BLOCK_SIZE(s->packet.framesize);
|
|
|
|
if (!frame) {
|
|
/* This can go negative, that's not a problem, we only pad if positive */
|
|
int pad_empty = s->packet.frames*(frame_size/s->avctx->frame_size) - s->bufqueue.available + 1;
|
|
/* Pad with empty 2.5 ms frames to whatever framesize was decided,
|
|
* this should only happen at the very last flush frame. The frames
|
|
* allocated here will be freed (because they have no other references)
|
|
* after they get used by celt_frame_setup_input() */
|
|
for (int i = 0; i < pad_empty; i++) {
|
|
AVFrame *empty = spawn_empty_frame(s);
|
|
if (!empty)
|
|
return AVERROR(ENOMEM);
|
|
ff_bufqueue_add(avctx, &s->bufqueue, empty);
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < s->packet.frames; i++) {
|
|
celt_encode_frame(s, &s->rc[i], &s->frame[i], i);
|
|
alloc_size += s->frame[i].framebits >> 3;
|
|
}
|
|
|
|
/* Worst case toc + the frame lengths if needed */
|
|
alloc_size += 2 + s->packet.frames*2;
|
|
|
|
if ((ret = ff_alloc_packet2(avctx, avpkt, alloc_size, 0)) < 0)
|
|
return ret;
|
|
|
|
/* Assemble packet */
|
|
opus_packet_assembler(s, avpkt);
|
|
|
|
/* Update the psychoacoustic system */
|
|
ff_opus_psy_postencode_update(&s->psyctx, s->frame, s->rc);
|
|
|
|
/* Remove samples from queue and skip if needed */
|
|
ff_af_queue_remove(&s->afq, s->packet.frames*frame_size, &avpkt->pts, &avpkt->duration);
|
|
if (s->packet.frames*frame_size > avpkt->duration) {
|
|
uint8_t *side = av_packet_new_side_data(avpkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
|
|
if (!side)
|
|
return AVERROR(ENOMEM);
|
|
AV_WL32(&side[4], s->packet.frames*frame_size - avpkt->duration + 120);
|
|
}
|
|
|
|
*got_packet_ptr = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int opus_encode_end(AVCodecContext *avctx)
|
|
{
|
|
OpusEncContext *s = avctx->priv_data;
|
|
|
|
for (int i = 0; i < CELT_BLOCK_NB; i++)
|
|
ff_mdct15_uninit(&s->mdct[i]);
|
|
|
|
ff_celt_pvq_uninit(&s->pvq);
|
|
av_freep(&s->dsp);
|
|
av_freep(&s->frame);
|
|
av_freep(&s->rc);
|
|
ff_af_queue_close(&s->afq);
|
|
ff_opus_psy_end(&s->psyctx);
|
|
ff_bufqueue_discard_all(&s->bufqueue);
|
|
av_freep(&avctx->extradata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int opus_encode_init(AVCodecContext *avctx)
|
|
{
|
|
int ret, max_frames;
|
|
OpusEncContext *s = avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
s->channels = avctx->channels;
|
|
|
|
/* Opus allows us to change the framesize on each packet (and each packet may
|
|
* have multiple frames in it) but we can't change the codec's frame size on
|
|
* runtime, so fix it to the lowest possible number of samples and use a queue
|
|
* to accumulate AVFrames until we have enough to encode whatever the encoder
|
|
* decides is the best */
|
|
avctx->frame_size = 120;
|
|
/* Initial padding will change if SILK is ever supported */
|
|
avctx->initial_padding = 120;
|
|
|
|
if (!avctx->bit_rate) {
|
|
int coupled = ff_opus_default_coupled_streams[s->channels - 1];
|
|
avctx->bit_rate = coupled*(96000) + (s->channels - coupled*2)*(48000);
|
|
} else if (avctx->bit_rate < 6000 || avctx->bit_rate > 255000 * s->channels) {
|
|
int64_t clipped_rate = av_clip(avctx->bit_rate, 6000, 255000 * s->channels);
|
|
av_log(avctx, AV_LOG_ERROR, "Unsupported bitrate %"PRId64" kbps, clipping to %"PRId64" kbps\n",
|
|
avctx->bit_rate/1000, clipped_rate/1000);
|
|
avctx->bit_rate = clipped_rate;
|
|
}
|
|
|
|
/* Extradata */
|
|
avctx->extradata_size = 19;
|
|
avctx->extradata = av_malloc(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!avctx->extradata)
|
|
return AVERROR(ENOMEM);
|
|
opus_write_extradata(avctx);
|
|
|
|
ff_af_queue_init(avctx, &s->afq);
|
|
|
|
if ((ret = ff_celt_pvq_init(&s->pvq, 1)) < 0)
|
|
return ret;
|
|
|
|
if (!(s->dsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT)))
|
|
return AVERROR(ENOMEM);
|
|
|
|
/* I have no idea why a base scaling factor of 68 works, could be the twiddles */
|
|
for (int i = 0; i < CELT_BLOCK_NB; i++)
|
|
if ((ret = ff_mdct15_init(&s->mdct[i], 0, i + 3, 68 << (CELT_BLOCK_NB - 1 - i))))
|
|
return AVERROR(ENOMEM);
|
|
|
|
/* Zero out previous energy (matters for inter first frame) */
|
|
for (int ch = 0; ch < s->channels; ch++)
|
|
memset(s->last_quantized_energy[ch], 0.0f, sizeof(float)*CELT_MAX_BANDS);
|
|
|
|
/* Allocate an empty frame to use as overlap for the first frame of audio */
|
|
ff_bufqueue_add(avctx, &s->bufqueue, spawn_empty_frame(s));
|
|
if (!ff_bufqueue_peek(&s->bufqueue, 0))
|
|
return AVERROR(ENOMEM);
|
|
|
|
if ((ret = ff_opus_psy_init(&s->psyctx, s->avctx, &s->bufqueue, &s->options)))
|
|
return ret;
|
|
|
|
/* Frame structs and range coder buffers */
|
|
max_frames = ceilf(FFMIN(s->options.max_delay_ms, 120.0f)/2.5f);
|
|
s->frame = av_malloc(max_frames*sizeof(CeltFrame));
|
|
if (!s->frame)
|
|
return AVERROR(ENOMEM);
|
|
s->rc = av_malloc(max_frames*sizeof(OpusRangeCoder));
|
|
if (!s->rc)
|
|
return AVERROR(ENOMEM);
|
|
|
|
for (int i = 0; i < max_frames; i++) {
|
|
s->frame[i].dsp = s->dsp;
|
|
s->frame[i].avctx = s->avctx;
|
|
s->frame[i].seed = 0;
|
|
s->frame[i].pvq = s->pvq;
|
|
s->frame[i].apply_phase_inv = s->options.apply_phase_inv;
|
|
s->frame[i].block[0].emph_coeff = s->frame[i].block[1].emph_coeff = 0.0f;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define OPUSENC_FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
|
|
static const AVOption opusenc_options[] = {
|
|
{ "opus_delay", "Maximum delay in milliseconds", offsetof(OpusEncContext, options.max_delay_ms), AV_OPT_TYPE_FLOAT, { .dbl = OPUS_MAX_LOOKAHEAD }, 2.5f, OPUS_MAX_LOOKAHEAD, OPUSENC_FLAGS, "max_delay_ms" },
|
|
{ "apply_phase_inv", "Apply intensity stereo phase inversion", offsetof(OpusEncContext, options.apply_phase_inv), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, OPUSENC_FLAGS, "apply_phase_inv" },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass opusenc_class = {
|
|
.class_name = "Opus encoder",
|
|
.item_name = av_default_item_name,
|
|
.option = opusenc_options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
static const AVCodecDefault opusenc_defaults[] = {
|
|
{ "b", "0" },
|
|
{ "compression_level", "10" },
|
|
{ NULL },
|
|
};
|
|
|
|
AVCodec ff_opus_encoder = {
|
|
.name = "opus",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Opus"),
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_OPUS,
|
|
.defaults = opusenc_defaults,
|
|
.priv_class = &opusenc_class,
|
|
.priv_data_size = sizeof(OpusEncContext),
|
|
.init = opus_encode_init,
|
|
.encode2 = opus_encode_frame,
|
|
.close = opus_encode_end,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
|
|
.capabilities = AV_CODEC_CAP_EXPERIMENTAL | AV_CODEC_CAP_SMALL_LAST_FRAME | AV_CODEC_CAP_DELAY,
|
|
.supported_samplerates = (const int []){ 48000, 0 },
|
|
.channel_layouts = (const uint64_t []){ AV_CH_LAYOUT_MONO,
|
|
AV_CH_LAYOUT_STEREO, 0 },
|
|
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
|
|
AV_SAMPLE_FMT_NONE },
|
|
};
|