/* * 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 "encode.h"#include "enc.h"#include "pvq.h"#include "enc_psy.h"#include "tab.h" #include "libavutil/channel_layout.h"#include "libavutil/float_dsp.h"#include "libavutil/mem.h"#include "libavutil/mem_internal.h"#include "libavutil/opt.h"#include "bytestream.h"#include "audio_frame_queue.h"#include "codec_internal.h" typedef struct OpusEncContext {    AVClass *av_class;    OpusEncOptions options;    OpusPsyContext psyctx;    AVCodecContext *avctx;    AudioFrameQueue afq;    AVFloatDSPContext *dsp;    AVTXContext *tx[CELT_BLOCK_NB];    av_tx_fn tx_fn[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->ch_layout.nb_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;    const float c = ff_opus_deemph_weights[0];     /* 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 * c;        }        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 * c;            }            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_padded, 128);                src1 = src2;                s->tx_fn[0](s->tx[0], b->coeffs + t, win, sizeof(float)*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_padded, 128);            memcpy(win + lap_dst + blk_len, temp, CELT_OVERLAP*sizeof(float));             s->tx_fn[f->size](s->tx[f->size], b->coeffs, win, sizeof(float));        }    }     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; 

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