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FFmpeg/libavcodec/aacenc.c

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/*
* AAC encoder
* Copyright (C) 2008 Konstantin Shishkov
*
* 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
*/
/**
* @file
* AAC encoder
*/
/***********************************
* TODOs:
* add sane pulse detection
***********************************/
#include <float.h>
#include "libavutil/channel_layout.h"
#include "libavutil/libm.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "put_bits.h"
#include "mpeg4audio.h"
#include "sinewin.h"
#include "profiles.h"
#include "version.h"
#include "aac.h"
#include "aactab.h"
#include "aacenc.h"
#include "aacenctab.h"
#include "aacenc_utils.h"
#include "psymodel.h"
/**
* List of PCE (Program Configuration Element) for the channel layouts listed
* in channel_layout.h
*
* For those wishing in the future to add other layouts:
*
* - num_ele: number of elements in each group of front, side, back, lfe channels
* (an element is of type SCE (single channel), CPE (channel pair) for
* the first 3 groups; and is LFE for LFE group).
*
* - pairing: 0 for an SCE element or 1 for a CPE; does not apply to LFE group
*
* - index: there are three independent indices for SCE, CPE and LFE;
* they are incremented irrespective of the group to which the element belongs;
* they are not reset when going from one group to another
*
* Example: for 7.0 channel layout,
* .pairing = { { 1, 0 }, { 1 }, { 1 }, }, (3 CPE and 1 SCE in front group)
* .index = { { 0, 0 }, { 1 }, { 2 }, },
* (index is 0 for the single SCE but goes from 0 to 2 for the CPEs)
*
* The index order impacts the channel ordering. But is otherwise arbitrary
* (the sequence could have been 2, 0, 1 instead of 0, 1, 2).
*
* Spec allows for discontinuous indices, e.g. if one has a total of two SCE,
* SCE.0 SCE.15 is OK per spec; BUT it won't be decoded by our AAC decoder
* which at this time requires that indices fully cover some range starting
* from 0 (SCE.1 SCE.0 is OK but not SCE.0 SCE.15).
*
* - config_map: total number of elements and their types. Beware, the way the
* types are ordered impacts the final channel ordering.
*
* - reorder_map: reorders the channels.
*
*/
static const AACPCEInfo aac_pce_configs[] = {
{
.layout = AV_CHANNEL_LAYOUT_MONO,
.num_ele = { 1, 0, 0, 0 },
.pairing = { { 0 }, },
.index = { { 0 }, },
.config_map = { 1, TYPE_SCE, },
.reorder_map = { 0 },
},
{
.layout = AV_CHANNEL_LAYOUT_STEREO,
.num_ele = { 1, 0, 0, 0 },
.pairing = { { 1 }, },
.index = { { 0 }, },
.config_map = { 1, TYPE_CPE, },
.reorder_map = { 0, 1 },
},
{
.layout = AV_CHANNEL_LAYOUT_2POINT1,
.num_ele = { 1, 0, 0, 1 },
.pairing = { { 1 }, },
.index = { { 0 },{ 0 },{ 0 },{ 0 } },
.config_map = { 2, TYPE_CPE, TYPE_LFE },
.reorder_map = { 0, 1, 2 },
},
{
.layout = AV_CHANNEL_LAYOUT_2_1,
.num_ele = { 1, 0, 1, 0 },
.pairing = { { 1 },{ 0 },{ 0 } },
.index = { { 0 },{ 0 },{ 0 }, },
.config_map = { 2, TYPE_CPE, TYPE_SCE },
.reorder_map = { 0, 1, 2 },
},
{
.layout = AV_CHANNEL_LAYOUT_SURROUND,
.num_ele = { 2, 0, 0, 0 },
.pairing = { { 0, 1 }, },
.index = { { 0, 0 }, },
.config_map = { 2, TYPE_SCE, TYPE_CPE },
.reorder_map = { 2, 0, 1 },
},
{
.layout = AV_CHANNEL_LAYOUT_3POINT1,
.num_ele = { 2, 0, 0, 1 },
.pairing = { { 0, 1 }, },
.index = { { 0, 0 }, { 0 }, { 0 }, { 0 }, },
.config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_LFE },
.reorder_map = { 2, 0, 1, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_4POINT0,
.num_ele = { 2, 0, 1, 0 },
.pairing = { { 0, 1 }, { 0 }, { 0 }, },
.index = { { 0, 0 }, { 0 }, { 1 } },
.config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_SCE },
.reorder_map = { 2, 0, 1, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_4POINT1,
.num_ele = { 2, 0, 1, 1 },
.pairing = { { 0, 1 }, { 0 }, { 0 }, },
.index = { { 0, 0 }, { 0 }, { 1 }, { 0 } },
.config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_SCE, TYPE_LFE },
.reorder_map = { 2, 0, 1, 4, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_2_2,
.num_ele = { 1, 0, 1, 0 },
.pairing = { { 1 }, { 0 }, { 1 }, },
.index = { { 0 }, { 0 }, { 1 } },
.config_map = { 2, TYPE_CPE, TYPE_CPE },
.reorder_map = { 0, 1, 2, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_QUAD,
.num_ele = { 1, 0, 1, 0 },
.pairing = { { 1 }, { 0 }, { 1 }, },
.index = { { 0 }, { 0 }, { 1 } },
.config_map = { 2, TYPE_CPE, TYPE_CPE },
.reorder_map = { 0, 1, 2, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_5POINT0,
.num_ele = { 2, 0, 1, 0 },
.pairing = { { 0, 1 }, { 0 }, { 1 } },
.index = { { 0, 0 }, { 0 }, { 1 } },
.config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_CPE },
.reorder_map = { 2, 0, 1, 3, 4 },
},
{
.layout = AV_CHANNEL_LAYOUT_5POINT1,
.num_ele = { 2, 0, 1, 1 },
.pairing = { { 0, 1 }, { 0 }, { 1 }, },
.index = { { 0, 0 }, { 0 }, { 1 }, { 0 } },
.config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
.reorder_map = { 2, 0, 1, 4, 5, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_5POINT0_BACK,
.num_ele = { 2, 0, 1, 0 },
.pairing = { { 0, 1 }, { 0 }, { 1 } },
.index = { { 0, 0 }, { 0 }, { 1 } },
.config_map = { 3, TYPE_SCE, TYPE_CPE, TYPE_CPE },
.reorder_map = { 2, 0, 1, 3, 4 },
},
{
.layout = AV_CHANNEL_LAYOUT_5POINT1_BACK,
.num_ele = { 2, 0, 1, 1 },
.pairing = { { 0, 1 }, { 0 }, { 1 }, },
.index = { { 0, 0 }, { 0 }, { 1 }, { 0 } },
.config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
.reorder_map = { 2, 0, 1, 4, 5, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_6POINT0,
.num_ele = { 2, 0, 2, 0 },
.pairing = { { 0, 1 }, { 0 }, { 1, 0 } },
.index = { { 0, 0 }, { 0 }, { 1, 1 } },
.config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
.reorder_map = { 2, 0, 1, 4, 5, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_6POINT0_FRONT,
.num_ele = { 2, 0, 1, 0 },
.pairing = { { 1, 1 }, { 0 }, { 1 } },
.index = { { 0, 1 }, { 0 }, { 2 }, },
.config_map = { 3, TYPE_CPE, TYPE_CPE, TYPE_CPE, },
.reorder_map = { 2, 3, 0, 1, 4, 5 },
},
{
.layout = AV_CHANNEL_LAYOUT_HEXAGONAL,
.num_ele = { 2, 0, 2, 0 },
.pairing = { { 0, 1 }, { 0 }, { 1, 0 } },
.index = { { 0, 0 }, { 0 }, { 1, 1 } },
.config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
.reorder_map = { 2, 0, 1, 3, 4, 5 },
},
{
.layout = AV_CHANNEL_LAYOUT_6POINT1,
.num_ele = { 2, 0, 2, 1 },
.pairing = { { 0, 1 }, { 0 }, { 1, 0 }, },
.index = { { 0, 0 }, { 0 }, { 1, 1 }, { 0 } },
.config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE, TYPE_LFE },
.reorder_map = { 2, 0, 1, 5, 6, 4, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_6POINT1_BACK,
.num_ele = { 2, 0, 2, 1 },
.pairing = { { 0, 1 },{ 0 },{ 1, 0 }, },
.index = { { 0, 0 },{ 0 },{ 1, 1 },{ 0 } },
.config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE, TYPE_LFE },
.reorder_map = { 2, 0, 1, 4, 5, 6, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_6POINT1_FRONT,
.num_ele = { 2, 0, 1, 1 },
.pairing = { { 1, 1 }, { 0 }, { 1 }, },
.index = { { 0, 1 }, { 0 }, { 2 }, { 0 }, },
.config_map = { 4, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE, },
.reorder_map = { 3, 4, 0, 1, 5, 6, 2 },
},
{
.layout = AV_CHANNEL_LAYOUT_7POINT0,
.num_ele = { 2, 0, 2, 0 },
.pairing = { { 0, 1 }, { 0 }, { 1, 1 }, },
.index = { { 0, 0 }, { 0 }, { 2, 1 }, },
.config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE },
.reorder_map = { 2, 0, 1, 3, 4, 5, 6 },
},
{
.layout = AV_CHANNEL_LAYOUT_7POINT0_FRONT,
.num_ele = { 3, 0, 1, 0 },
.pairing = { { 0, 1, 1 }, { 0 }, { 1 }, },
.index = { { 0, 0, 1 }, { 0 }, { 2 }, },
.config_map = { 4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE },
.reorder_map = { 2, 3, 4, 0, 1, 5, 6 },
},
{
.layout = AV_CHANNEL_LAYOUT_7POINT1,
.num_ele = { 2, 0, 2, 1 },
.pairing = { { 0, 1 }, { 0 }, { 1, 1 }, },
.index = { { 0, 0 }, { 0 }, { 2, 1 }, { 0 } },
.config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
.reorder_map = { 2, 0, 1, 4, 5, 6, 7, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_7POINT1_WIDE,
.num_ele = { 3, 0, 1, 1 },
.pairing = { { 0, 1, 1 }, { 0 }, { 1 }, },
.index = { { 0, 0, 1 }, { 0 }, { 2 }, { 0 }, },
.config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
.reorder_map = { 2, 4, 5, 0, 1, 6, 7, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_7POINT1_WIDE_BACK,
.num_ele = { 3, 0, 1, 1 },
.pairing = { { 0, 1, 1 }, { 0 }, { 1 } },
.index = { { 0, 0, 1 }, { 0 }, { 2 }, { 0 } },
.config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE },
.reorder_map = { 2, 6, 7, 0, 1, 4, 5, 3 },
},
{
.layout = AV_CHANNEL_LAYOUT_OCTAGONAL,
.num_ele = { 2, 0, 3, 0 },
.pairing = { { 0, 1 }, { 0 }, { 1, 1, 0 }, },
.index = { { 0, 0 }, { 0 }, { 1, 2, 1 }, },
.config_map = { 5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_SCE },
.reorder_map = { 2, 0, 1, 6, 7, 3, 4, 5 },
},
};
static void put_pce(PutBitContext *pb, AVCodecContext *avctx)
{
int i, j;
AACEncContext *s = avctx->priv_data;
AACPCEInfo *pce = &s->pce;
const int bitexact = avctx->flags & AV_CODEC_FLAG_BITEXACT;
const char *aux_data = bitexact ? "Lavc" : LIBAVCODEC_IDENT;
put_bits(pb, 4, 0);
put_bits(pb, 2, avctx->profile);
put_bits(pb, 4, s->samplerate_index);
put_bits(pb, 4, pce->num_ele[0]); /* Front */
put_bits(pb, 4, pce->num_ele[1]); /* Side */
put_bits(pb, 4, pce->num_ele[2]); /* Back */
put_bits(pb, 2, pce->num_ele[3]); /* LFE */
put_bits(pb, 3, 0); /* Assoc data */
put_bits(pb, 4, 0); /* CCs */
put_bits(pb, 1, 0); /* Stereo mixdown */
put_bits(pb, 1, 0); /* Mono mixdown */
put_bits(pb, 1, 0); /* Something else */
for (i = 0; i < 4; i++) {
for (j = 0; j < pce->num_ele[i]; j++) {
if (i < 3)
put_bits(pb, 1, pce->pairing[i][j]);
put_bits(pb, 4, pce->index[i][j]);
}
}
align_put_bits(pb);
put_bits(pb, 8, strlen(aux_data));
ff_put_string(pb, aux_data, 0);
}
/**
* Make AAC audio config object.
* @see 1.6.2.1 "Syntax - AudioSpecificConfig"
*/
static int put_audio_specific_config(AVCodecContext *avctx, int chcfg)
{
PutBitContext pb;
AACEncContext *s = avctx->priv_data;
const int max_size = 32;
avctx->extradata = av_mallocz(max_size);
if (!avctx->extradata)
return AVERROR(ENOMEM);
init_put_bits(&pb, avctx->extradata, max_size);
put_bits(&pb, 5, s->profile+1); //profile
put_bits(&pb, 4, s->samplerate_index); //sample rate index
put_bits(&pb, 4, chcfg);
//GASpecificConfig
put_bits(&pb, 1, 0); //frame length - 1024 samples
put_bits(&pb, 1, 0); //does not depend on core coder
put_bits(&pb, 1, 0); //is not extension
if (s->needs_pce)
put_pce(&pb, avctx);
//Explicitly Mark SBR absent
put_bits(&pb, 11, 0x2b7); //sync extension
put_bits(&pb, 5, AOT_SBR);
put_bits(&pb, 1, 0);
flush_put_bits(&pb);
avctx->extradata_size = put_bytes_output(&pb);
return 0;
}
void ff_quantize_band_cost_cache_init(struct AACEncContext *s)
{
++s->quantize_band_cost_cache_generation;
if (s->quantize_band_cost_cache_generation == 0) {
memset(s->quantize_band_cost_cache, 0, sizeof(s->quantize_band_cost_cache));
s->quantize_band_cost_cache_generation = 1;
}
}
#define WINDOW_FUNC(type) \
static void apply_ ##type ##_window(AVFloatDSPContext *fdsp, \
SingleChannelElement *sce, \
const float *audio)
WINDOW_FUNC(only_long)
{
const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
float *out = sce->ret_buf;
fdsp->vector_fmul (out, audio, lwindow, 1024);
fdsp->vector_fmul_reverse(out + 1024, audio + 1024, pwindow, 1024);
}
WINDOW_FUNC(long_start)
{
const float *lwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_long_1024 : ff_sine_1024;
const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
float *out = sce->ret_buf;
fdsp->vector_fmul(out, audio, lwindow, 1024);
memcpy(out + 1024, audio + 1024, sizeof(out[0]) * 448);
fdsp->vector_fmul_reverse(out + 1024 + 448, audio + 1024 + 448, swindow, 128);
memset(out + 1024 + 576, 0, sizeof(out[0]) * 448);
}
WINDOW_FUNC(long_stop)
{
const float *lwindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_long_1024 : ff_sine_1024;
const float *swindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
float *out = sce->ret_buf;
memset(out, 0, sizeof(out[0]) * 448);
fdsp->vector_fmul(out + 448, audio + 448, swindow, 128);
memcpy(out + 576, audio + 576, sizeof(out[0]) * 448);
fdsp->vector_fmul_reverse(out + 1024, audio + 1024, lwindow, 1024);
}
WINDOW_FUNC(eight_short)
{
const float *swindow = sce->ics.use_kb_window[0] ? ff_aac_kbd_short_128 : ff_sine_128;
const float *pwindow = sce->ics.use_kb_window[1] ? ff_aac_kbd_short_128 : ff_sine_128;
const float *in = audio + 448;
float *out = sce->ret_buf;
int w;
for (w = 0; w < 8; w++) {
fdsp->vector_fmul (out, in, w ? pwindow : swindow, 128);
out += 128;
in += 128;
fdsp->vector_fmul_reverse(out, in, swindow, 128);
out += 128;
}
}
static void (*const apply_window[4])(AVFloatDSPContext *fdsp,
SingleChannelElement *sce,
const float *audio) = {
[ONLY_LONG_SEQUENCE] = apply_only_long_window,
[LONG_START_SEQUENCE] = apply_long_start_window,
[EIGHT_SHORT_SEQUENCE] = apply_eight_short_window,
[LONG_STOP_SEQUENCE] = apply_long_stop_window
};
static void apply_window_and_mdct(AACEncContext *s, SingleChannelElement *sce,
float *audio)
{
int i;
float *output = sce->ret_buf;
apply_window[sce->ics.window_sequence[0]](s->fdsp, sce, audio);
if (sce->ics.window_sequence[0] != EIGHT_SHORT_SEQUENCE)
s->mdct1024_fn(s->mdct1024, sce->coeffs, output, sizeof(float));
else
for (i = 0; i < 1024; i += 128)
s->mdct128_fn(s->mdct128, &sce->coeffs[i], output + i*2, sizeof(float));
memcpy(audio, audio + 1024, sizeof(audio[0]) * 1024);
memcpy(sce->pcoeffs, sce->coeffs, sizeof(sce->pcoeffs));
}
/**
* Encode ics_info element.
* @see Table 4.6 (syntax of ics_info)
*/
static void put_ics_info(AACEncContext *s, IndividualChannelStream *info)
{
int w;
put_bits(&s->pb, 1, 0); // ics_reserved bit
put_bits(&s->pb, 2, info->window_sequence[0]);
put_bits(&s->pb, 1, info->use_kb_window[0]);
if (info->window_sequence[0] != EIGHT_SHORT_SEQUENCE) {
put_bits(&s->pb, 6, info->max_sfb);
put_bits(&s->pb, 1, 0); /* No predictor present */
} else {
put_bits(&s->pb, 4, info->max_sfb);
for (w = 1; w < 8; w++)
put_bits(&s->pb, 1, !info->group_len[w]);
}
}
/**
* Encode MS data.
* @see 4.6.8.1 "Joint Coding - M/S Stereo"
*/
static void encode_ms_info(PutBitContext *pb, ChannelElement *cpe)
{
int i, w;
put_bits(pb, 2, cpe->ms_mode);
if (cpe->ms_mode == 1)
for (w = 0; w < cpe->ch[0].ics.num_windows; w += cpe->ch[0].ics.group_len[w])
for (i = 0; i < cpe->ch[0].ics.max_sfb; i++)
put_bits(pb, 1, cpe->ms_mask[w*16 + i]);
}
/**
* Produce integer coefficients from scalefactors provided by the model.
*/
static void adjust_frame_information(ChannelElement *cpe, int chans)
{
int i, w, w2, g, ch;
int maxsfb, cmaxsfb;
for (ch = 0; ch < chans; ch++) {
IndividualChannelStream *ics = &cpe->ch[ch].ics;
maxsfb = 0;
cpe->ch[ch].pulse.num_pulse = 0;
for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
for (cmaxsfb = ics->num_swb; cmaxsfb > 0 && cpe->ch[ch].zeroes[w*16+cmaxsfb-1]; cmaxsfb--)
;
maxsfb = FFMAX(maxsfb, cmaxsfb);
}
ics->max_sfb = maxsfb;
//adjust zero bands for window groups
for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
for (g = 0; g < ics->max_sfb; g++) {
i = 1;
for (w2 = w; w2 < w + ics->group_len[w]; w2++) {
if (!cpe->ch[ch].zeroes[w2*16 + g]) {
i = 0;
break;
}
}
cpe->ch[ch].zeroes[w*16 + g] = i;
}
}
}
if (chans > 1 && cpe->common_window) {
IndividualChannelStream *ics0 = &cpe->ch[0].ics;
IndividualChannelStream *ics1 = &cpe->ch[1].ics;
int msc = 0;
ics0->max_sfb = FFMAX(ics0->max_sfb, ics1->max_sfb);
ics1->max_sfb = ics0->max_sfb;
for (w = 0; w < ics0->num_windows*16; w += 16)
for (i = 0; i < ics0->max_sfb; i++)
if (cpe->ms_mask[w+i])
msc++;
if (msc == 0 || ics0->max_sfb == 0)
cpe->ms_mode = 0;
else
cpe->ms_mode = msc < ics0->max_sfb * ics0->num_windows ? 1 : 2;
}
}
static void apply_intensity_stereo(ChannelElement *cpe)
{
int w, w2, g, i;
IndividualChannelStream *ics = &cpe->ch[0].ics;
if (!cpe->common_window)
return;
for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
for (w2 = 0; w2 < ics->group_len[w]; w2++) {
int start = (w+w2) * 128;
for (g = 0; g < ics->num_swb; g++) {
int p = -1 + 2 * (cpe->ch[1].band_type[w*16+g] - 14);
float scale = cpe->ch[0].is_ener[w*16+g];
if (!cpe->is_mask[w*16 + g]) {
start += ics->swb_sizes[g];
continue;
}
if (cpe->ms_mask[w*16 + g])
p *= -1;
for (i = 0; i < ics->swb_sizes[g]; i++) {
float sum = (cpe->ch[0].coeffs[start+i] + p*cpe->ch[1].coeffs[start+i])*scale;
cpe->ch[0].coeffs[start+i] = sum;
cpe->ch[1].coeffs[start+i] = 0.0f;
}
start += ics->swb_sizes[g];
}
}
}
}
/* I/S acceptance level for the image-error EMA at full rate pressure */
#define NMR_IS_IMG_GATE 8000.0f
/* Frequency in Hz for the lower limit of intensity stereo */
#define NMR_IS_LOW_LIMIT 6100
/* M/S adoption: es < 0.5*em, content-driven and rate-free */
#define NMR_MS_EQUIV 0.5f
#define NMR_MS_MASK 0.0f
/* Pair decouple threshold on the joint-tool candidacy fraction EMA: pairs
* whose joint tools are mostly dead (diffuse decorrelated content) window
* per-channel and skip M/S; recouple above 1.3x. */
#define NMR_DECORR_LO 0.20f
/* Stereo-decision hysteresis: leaving a joint mode costs a margin. */
#define NMR_STICKY 2.0f
/* Decision statistics are EMA-smoothed across frames. */
#define NMR_SDEC_EMA 0.75f
/* PNS-stereo gate: substitute only clearly-decorrelated (wide) bands. */
#define NMR_PNS_STEREO_DECORR 0.6f
/* Recode one band's window group as mid+side in place. */
static void nmr_apply_ms_band(AACEncContext *s, ChannelElement *cpe,
int w, int g, int start, int len, int gl)
{
SingleChannelElement *sce0 = &cpe->ch[0];
SingleChannelElement *sce1 = &cpe->ch[1];
cpe->ms_mask[w*16+g] = 1;
for (int w2 = 0; w2 < gl; w2++) {
FFPsyBand *b0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
FFPsyBand *b1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
float *L = sce0->coeffs + start + (w+w2)*128;
float *R = sce1->coeffs + start + (w+w2)*128;
float em = 0.0f, es = 0.0f;
for (int i = 0; i < len; i++) {
float m = (L[i] + R[i]) * 0.5f;
R[i] = m - R[i]; L[i] = m;
em += L[i]*L[i]; es += R[i]*R[i];
}
b0->threshold = FFMIN(b0->threshold, b1->threshold) * 0.5f;
b1->threshold = b0->threshold;
b0->energy = em; b1->energy = es;
}
}
/* I/S perceptual test: reconstruction image error vs the pair's masks. */
static int nmr_is_image_masked(AACEncContext *s, ChannelElement *cpe,
int w, int g, int start, int len, int gl,
float ener0, float ener1, float dot,
float minthr0, float minthr1, float *ratio_out,
float *scale_out, float *sr_out, int *p_out)
{
int p = dot >= 0.0f ? 1 : -1;
float ener01 = ener0 + ener1 + 2*p*dot; /* energy of L + p*R */
*ratio_out = FLT_MAX;
if (ener01 <= FLT_MIN)
return 0;
float scale = sqrtf(ener0 / ener01); /* carrier = (L + p*R)*scale */
float sr_ = sqrtf(ener1 / ener0); /* decoder: R = p*sr_*carrier */
float img0 = 0.0f, img1 = 0.0f;
for (int w2 = 0; w2 < gl; w2++) {
const float *L = cpe->ch[0].coeffs + start + (w+w2)*128;
const float *R = cpe->ch[1].coeffs + start + (w+w2)*128;
for (int i = 0; i < len; i++) {
float c = (L[i] + p*R[i]) * scale;
float dl = L[i] - c, dr = R[i] - p*sr_*c;
img0 += dl*dl; img1 += dr*dr;
}
}
*ratio_out = FFMAX(img0 / FFMAX(minthr0 * gl, FLT_MIN),
img1 / FFMAX(minthr1 * gl, FLT_MIN));
*scale_out = scale; *sr_out = sr_; *p_out = p;
return 1;
}
/* Recode one band's window group as intensity stereo in place: replace L with the
* carrier, zero R, signal the phase via the side channel's band type, and fold the
* pair's masking into the surviving (carrier) channel. */
static void nmr_apply_is_band(AACEncContext *s, ChannelElement *cpe,
int w, int g, int start, int len, int gl,
float scale, float sr_, int p,
float ener0, float ener1)
{
cpe->is_mask[w*16+g] = 1;
cpe->ch[0].is_ener[w*16+g] = scale;
cpe->ch[1].is_ener[w*16+g] = ener0 / ener1;
cpe->ch[1].band_type[w*16+g] = p > 0 ? INTENSITY_BT : INTENSITY_BT2;
for (int w2 = 0; w2 < gl; w2++) {
FFPsyBand *b0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
FFPsyBand *b1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
float *L = cpe->ch[0].coeffs + start + (w+w2)*128;
float *R = cpe->ch[1].coeffs + start + (w+w2)*128;
float ec = 0.0f;
for (int i = 0; i < len; i++) {
L[i] = (L[i] + p*R[i]) * scale;
R[i] = 0.0f;
ec += L[i]*L[i];
}
b0->threshold = FFMIN(b0->threshold, b1->threshold / FFMAX(sr_*sr_, 1e-9f));
b0->energy = ec; b1->energy = 0.0f;
}
}
/*
* Per-band stereo-mode decision (L/R vs M/S vs intensity) for the NMR coder,
* made before quantization from the psychoacoustic model alone, so the
* quantizer search allocates natively on the spectra that are actually coded.
*/
static void nmr_decide_stereo(AACEncContext *s, ChannelElement *cpe)
{
SingleChannelElement *sce0 = &cpe->ch[0];
SingleChannelElement *sce1 = &cpe->ch[1];
IndividualChannelStream *ics = &sce0->ics;
const AVCodecContext *avctx = s->psy.avctx;
const float freq_mult = avctx->sample_rate / (1024.0f / ics->num_windows) / 2.0f;
int is_count = 0;
if (s->nmr) {
int pi = (s->cur_channel >> 1) & 7;
pi = pi * 2 + (ics->num_windows == 8); /* per-grid state bank */
if (!s->nmr->sinit[pi]) {
/* one-time init; per-grid banks persist across window switches
* (wiping them churned stereo modes audibly) */
memset(s->nmr->smode[pi], 0, sizeof(s->nmr->smode[pi]));
for (int b = 0; b < 128; b++) {
s->nmr->sema_em[pi][b] = 0.0f;
s->nmr->sema_img[pi][b] = -1.0f;
}
s->nmr->sinit[pi] = 1;
}
}
/* Per-band stereo decision (L/R vs M/S vs I/S), made pre-quantization from
* the psy model so the trellis allocates on the coded spectra. */
/* I/S engages under SUSTAINED strain only: rate pressure gated by the
* lambda floor (pressure spikes at a comfortable operating point must
* not admit it). Unengaged candidates fall back to M/S. */
float is_ramp = s->nmr ? s->nmr->press *
av_clipf((s->nmr->lam_floor - 40.0f) / (120.0f - 40.0f), 0.0f, 1.0f) : 0.0f;
const int allow_is = s->options.intensity_stereo && is_ramp > 0.0f;
const int pidx = (s->cur_channel >> 1) & 15;
const int decoupled = s->psy.pair_decoupled[pidx];
int njoint = 0, nbands = 0; /* joint-tool candidacy census, decouple feed */
for (int w = 0; w < ics->num_windows; w += ics->group_len[w]) {
int start = 0;
for (int g = 0; g < ics->num_swb; start += ics->swb_sizes[g++]) {
int len = ics->swb_sizes[g], gl = ics->group_len[w];
float ener0 = 0.0f, ener1 = 0.0f, dot = 0.0f, es_tot = 0.0f, em_tot = 0.0f;
float minthr0 = FLT_MAX, minthr1 = FLT_MAX;
cpe->is_mask[w*16+g] = 0;
cpe->ms_mask[w*16+g] = 0;
for (int w2 = 0; w2 < gl; w2++) {
FFPsyBand *b0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g];
FFPsyBand *b1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g];
const float *L = sce0->coeffs + start + (w+w2)*128;
const float *R = sce1->coeffs + start + (w+w2)*128;
float el = 0.0f, er = 0.0f, em = 0.0f, es = 0.0f, d = 0.0f;
for (int i = 0; i < len; i++) {
float m = (L[i] + R[i]) * 0.5f;
float sv = m - R[i];
el += L[i]*L[i]; er += R[i]*R[i];
em += m*m; es += sv*sv; d += L[i]*R[i];
}
ener0 += el; ener1 += er; dot += d; es_tot += es; em_tot += em;
minthr0 = FFMIN(minthr0, b0->threshold);
minthr1 = FFMIN(minthr1, b1->threshold);
}
float thr_g = FFMIN(minthr0, minthr1) * gl; /* group masking budget */
/* PNS-stereo reservation: keep clearly-wide noise bands for PNS. */
const int sidx = w*16+g;
{
float es_w = es_tot, em_w = em_tot;
if (s->nmr) {
int pi_ = ((s->cur_channel >> 1) & 7) * 2 + (cpe->ch[0].ics.num_windows == 8);
float pe = s->nmr->sema_es[pi_][sidx];
float pm = s->nmr->sema_em[pi_][sidx];
if (pm > 0.0f) {
es_w = NMR_SDEC_EMA * pe + (1.0f - NMR_SDEC_EMA) * es_tot;
em_w = NMR_SDEC_EMA * pm + (1.0f - NMR_SDEC_EMA) * em_tot;
}
}
if (cpe->ch[0].can_pns[w*16+g] && cpe->ch[1].can_pns[w*16+g] &&
es_w > NMR_PNS_STEREO_DECORR * em_w)
continue;
}
cpe->ch[0].can_pns[w*16+g] = cpe->ch[1].can_pns[w*16+g] = 0;
int pi = ((s->cur_channel >> 1) & 7) * 2 + (cpe->ch[0].ics.num_windows == 8);
uint8_t *pmode = s->nmr ? s->nmr->smode[pi] : NULL;
int prev = pmode ? pmode[sidx] : 0;
float eqgate = NMR_MS_EQUIV * (prev == 1 ? 1.5f : 1.0f); /* stay-until es>0.75em */
/* I/S = lossy economy: image-error budget scales with pressure */
float imgate = NMR_IS_IMG_GATE * is_ramp * (prev == 2 ? NMR_STICKY : 1.0f);
float es_d = es_tot, em_d = em_tot;
if (s->nmr) {
float *ees = &s->nmr->sema_es[pi][sidx];
float *eem = &s->nmr->sema_em[pi][sidx];
if (*eem <= 0.0f) { *ees = es_tot; *eem = em_tot; }
else {
*ees = NMR_SDEC_EMA * *ees + (1.0f - NMR_SDEC_EMA) * es_tot;
*eem = NMR_SDEC_EMA * *eem + (1.0f - NMR_SDEC_EMA) * em_tot;
}
es_d = *ees; em_d = *eem;
}
int ms_would = s->options.mid_side &&
(s->options.mid_side == 1 ||
es_d < eqgate * em_d ||
es_tot < NMR_MS_MASK * thr_g);
int ms_ok = ms_would && !decoupled;
float scale, sr_, imgratio; int p;
/* I/S competes with M/S above the frequency limit (candidacy must
* not be gated on !ms_ok - that leaves only unrenderable bands) */
int is_cand = start * freq_mult > NMR_IS_LOW_LIMIT &&
ener0 > FLT_MIN && ener1 > FLT_MIN &&
nmr_is_image_masked(s, cpe, w, g, start, len, gl,
ener0, ener1, dot, minthr0, minthr1,
&imgratio, &scale, &sr_, &p);
int is_ok = is_cand;
if (s->nmr && start * freq_mult > NMR_IS_LOW_LIMIT) {
/* smoothed image-error; updated only while candidate (fail-value
* feeding jammed it permanently high) */
float *eim = &s->nmr->sema_img[pi][sidx];
if (is_cand) {
/* seed from first measurement; freeze when not candidate */
if (*eim < 0.0f) *eim = imgratio;
else *eim = NMR_SDEC_EMA * *eim + (1.0f - NMR_SDEC_EMA) * FFMIN(imgratio, 100.0f * NMR_IS_IMG_GATE);
}
is_ok = is_cand && *eim >= 0.0f && *eim < imgate;
}
njoint += ms_would || is_ok; nbands++;
if (pmode) {
int m_ = (is_ok && allow_is) ? 2 : ms_ok ? 1 :
(is_ok && s->options.mid_side) ? 1 : 0;
pmode[sidx] = m_;
s->nmr->smode_band[(s->cur_channel >> 1) & 7][w*16+g] = m_;
}
if (is_ok && allow_is) {
nmr_apply_is_band(s, cpe, w, g, start, len, gl,
scale, sr_, p, ener0, ener1);
is_count++;
} else if (ms_ok || (is_ok && s->options.mid_side)) {
nmr_apply_ms_band(s, cpe, w, g, start, len, gl);
}
/* else: keep full L/R stereo */
}
}
cpe->is_mode = !!is_count;
if (nbands > 0) {
/* Pair joint-tool value, read next frame by the psy pair-synced window
* decision and the M/S candidacy above. Measured as CANDIDACY (not
* adoption) so decoupling cannot starve its own signal and self-lock. */
float r = (float)njoint / nbands;
float *pj = &s->psy.pair_joint[pidx];
*pj = *pj > 0.0f ? 0.95f * *pj + 0.05f * r : r;
s->psy.pair_decoupled[pidx] = *pj <
(s->psy.pair_decoupled[pidx] ? 1.3f * NMR_DECORR_LO : NMR_DECORR_LO);
}
}
static void apply_mid_side_stereo(ChannelElement *cpe)
{
int w, w2, g, i;
IndividualChannelStream *ics = &cpe->ch[0].ics;
if (!cpe->common_window)
return;
for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
for (w2 = 0; w2 < ics->group_len[w]; w2++) {
int start = (w+w2) * 128;
for (g = 0; g < ics->num_swb; g++) {
/* ms_mask can be used for other purposes in PNS and I/S,
* so must not apply M/S if any band uses either, even if
* ms_mask is set.
*/
if (!cpe->ms_mask[w*16 + g] || cpe->is_mask[w*16 + g]
|| cpe->ch[0].band_type[w*16 + g] >= NOISE_BT
|| cpe->ch[1].band_type[w*16 + g] >= NOISE_BT) {
start += ics->swb_sizes[g];
continue;
}
for (i = 0; i < ics->swb_sizes[g]; i++) {
float L = (cpe->ch[0].coeffs[start+i] + cpe->ch[1].coeffs[start+i]) * 0.5f;
float R = L - cpe->ch[1].coeffs[start+i];
cpe->ch[0].coeffs[start+i] = L;
cpe->ch[1].coeffs[start+i] = R;
}
start += ics->swb_sizes[g];
}
}
}
}
/**
* Encode scalefactor band coding type.
*/
static void encode_band_info(AACEncContext *s, SingleChannelElement *sce)
{
int w;
if (s->coder->set_special_band_scalefactors)
s->coder->set_special_band_scalefactors(s, sce);
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w])
s->coder->encode_window_bands_info(s, sce, w, sce->ics.group_len[w], s->lambda);
}
/**
* Encode scalefactors.
*/
static void encode_scale_factors(AVCodecContext *avctx, AACEncContext *s,
SingleChannelElement *sce)
{
int diff, off_sf = sce->sf_idx[0], off_pns = sce->sf_idx[0] - NOISE_OFFSET;
int off_is = 0, noise_flag = 1;
int i, w;
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
for (i = 0; i < sce->ics.max_sfb; i++) {
if (!sce->zeroes[w*16 + i]) {
if (sce->band_type[w*16 + i] == NOISE_BT) {
diff = sce->sf_idx[w*16 + i] - off_pns;
off_pns = sce->sf_idx[w*16 + i];
if (noise_flag-- > 0) {
put_bits(&s->pb, NOISE_PRE_BITS, diff + NOISE_PRE);
continue;
}
} else if (sce->band_type[w*16 + i] == INTENSITY_BT ||
sce->band_type[w*16 + i] == INTENSITY_BT2) {
diff = sce->sf_idx[w*16 + i] - off_is;
off_is = sce->sf_idx[w*16 + i];
} else {
diff = sce->sf_idx[w*16 + i] - off_sf;
off_sf = sce->sf_idx[w*16 + i];
}
diff += SCALE_DIFF_ZERO;
av_assert0(diff >= 0 && diff <= 120);
put_bits(&s->pb, ff_aac_scalefactor_bits[diff], ff_aac_scalefactor_code[diff]);
}
}
}
}
/**
* Encode pulse data.
*/
static void encode_pulses(AACEncContext *s, Pulse *pulse)
{
int i;
put_bits(&s->pb, 1, !!pulse->num_pulse);
if (!pulse->num_pulse)
return;
put_bits(&s->pb, 2, pulse->num_pulse - 1);
put_bits(&s->pb, 6, pulse->start);
for (i = 0; i < pulse->num_pulse; i++) {
put_bits(&s->pb, 5, pulse->pos[i]);
put_bits(&s->pb, 4, pulse->amp[i]);
}
}
/**
* Encode spectral coefficients processed by psychoacoustic model.
*/
static void encode_spectral_coeffs(AACEncContext *s, SingleChannelElement *sce)
{
int start, i, w, w2;
for (w = 0; w < sce->ics.num_windows; w += sce->ics.group_len[w]) {
start = 0;
for (i = 0; i < sce->ics.max_sfb; i++) {
if (sce->zeroes[w*16 + i]) {
start += sce->ics.swb_sizes[i];
continue;
}
for (w2 = w; w2 < w + sce->ics.group_len[w]; w2++) {
s->coder->quantize_and_encode_band(s, &s->pb,
&sce->coeffs[start + w2*128],
NULL, sce->ics.swb_sizes[i],
sce->sf_idx[w*16 + i],
sce->band_type[w*16 + i],
s->lambda,
sce->ics.window_clipping[w]);
}
start += sce->ics.swb_sizes[i];
}
}
}
/**
* Downscale spectral coefficients for near-clipping windows to avoid artifacts
*/
static void avoid_clipping(AACEncContext *s, SingleChannelElement *sce)
{
int start, i, j, w;
if (sce->ics.clip_avoidance_factor < 1.0f) {
for (w = 0; w < sce->ics.num_windows; w++) {
start = 0;
for (i = 0; i < sce->ics.max_sfb; i++) {
float *swb_coeffs = &sce->coeffs[start + w*128];
for (j = 0; j < sce->ics.swb_sizes[i]; j++)
swb_coeffs[j] *= sce->ics.clip_avoidance_factor;
start += sce->ics.swb_sizes[i];
}
}
}
}
/**
* Encode one channel of audio data.
*/
static int encode_individual_channel(AVCodecContext *avctx, AACEncContext *s,
SingleChannelElement *sce,
int common_window)
{
put_bits(&s->pb, 8, sce->sf_idx[0]);
if (!common_window)
put_ics_info(s, &sce->ics);
encode_band_info(s, sce);
encode_scale_factors(avctx, s, sce);
encode_pulses(s, &sce->pulse);
put_bits(&s->pb, 1, !!sce->tns.present);
if (s->coder->encode_tns_info)
s->coder->encode_tns_info(s, sce);
put_bits(&s->pb, 1, 0); //ssr
encode_spectral_coeffs(s, sce);
return 0;
}
/**
* Write some auxiliary information about the created AAC file.
*/
static void put_bitstream_info(AACEncContext *s, const char *name)
{
int i, namelen, padbits;
namelen = strlen(name) + 2;
put_bits(&s->pb, 3, TYPE_FIL);
put_bits(&s->pb, 4, FFMIN(namelen, 15));
if (namelen >= 15)
put_bits(&s->pb, 8, namelen - 14);
put_bits(&s->pb, 4, 0); //extension type - filler
padbits = -put_bits_count(&s->pb) & 7;
align_put_bits(&s->pb);
for (i = 0; i < namelen - 2; i++)
put_bits(&s->pb, 8, name[i]);
put_bits(&s->pb, 12 - padbits, 0);
}
/*
* Copy input samples.
* Channels are reordered from libavcodec's default order to AAC order.
*/
static void copy_input_samples(AACEncContext *s, const AVFrame *frame)
{
int ch;
int end = 2048 + (frame ? frame->nb_samples : 0);
const uint8_t *channel_map = s->reorder_map;
/* copy and remap input samples */
for (ch = 0; ch < s->channels; ch++) {
/* copy last 1024 samples of previous frame to the start of the current frame */
memcpy(&s->planar_samples[ch][1024], &s->planar_samples[ch][2048], 1024 * sizeof(s->planar_samples[0][0]));
/* copy new samples and zero any remaining samples */
if (frame) {
memcpy(&s->planar_samples[ch][2048],
frame->extended_data[channel_map[ch]],
frame->nb_samples * sizeof(s->planar_samples[0][0]));
}
memset(&s->planar_samples[ch][end], 0,
(3072 - end) * sizeof(s->planar_samples[0][0]));
}
}
static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
AACEncContext *s = avctx->priv_data;
float **samples = s->planar_samples, *samples2, *la, *overlap;
ChannelElement *cpe;
SingleChannelElement *sce;
IndividualChannelStream *ics;
int i, its, ch, w, chans, tag, start_ch, ret, frame_bits;
int target_bits, rate_bits, too_many_bits, too_few_bits;
int ms_mode = 0, is_mode = 0, tns_mode = 0, pred_mode = 0;
int chan_el_counter[4];
FFPsyWindowInfo windows[AAC_MAX_CHANNELS];
/* add current frame to queue */
if (frame) {
if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
return ret;
} else {
if (!s->afq.remaining_samples || (!s->afq.frame_alloc && !s->afq.frame_count))
return 0;
}
copy_input_samples(s, frame);
if (!avctx->frame_num)
return 0;
start_ch = 0;
for (i = 0; i < s->chan_map[0]; i++) {
FFPsyWindowInfo* wi = windows + start_ch;
tag = s->chan_map[i+1];
chans = tag == TYPE_CPE ? 2 : 1;
cpe = &s->cpe[i];
{
int wi_paired = 0;
/* Synced pair windows: decide both channels of a CPE together so
* their block switching never diverges (see psy window_pair). */
if (chans == 2 && tag != TYPE_LFE && s->psy.model->window_pair && frame) {
const float *ov0 = &samples[start_ch][0], *ov1 = &samples[start_ch + 1][0];
s->psy.model->window_pair(&s->psy,
ov0 + 1024, ov0 + 1024 + 448 + 64,
ov1 + 1024, ov1 + 1024 + 448 + 64,
start_ch, start_ch + 1,
cpe->ch[0].ics.window_sequence[0],
cpe->ch[1].ics.window_sequence[0],
wi);
wi_paired = 1;
}
for (ch = 0; ch < chans; ch++) {
int k;
float clip_avoidance_factor;
sce = &cpe->ch[ch];
ics = &sce->ics;
s->cur_channel = start_ch + ch;
overlap = &samples[s->cur_channel][0];
samples2 = overlap + 1024;
la = samples2 + (448+64);
if (!frame)
la = NULL;
if (tag == TYPE_LFE) {
wi[ch].window_type[0] = wi[ch].window_type[1] = ONLY_LONG_SEQUENCE;
wi[ch].window_shape = 0;
wi[ch].num_windows = 1;
wi[ch].grouping[0] = 1;
wi[ch].clipping[0] = 0;
/* Only the lowest 12 coefficients are used in a LFE channel.
* The expression below results in only the bottom 8 coefficients
* being used for 11.025kHz to 16kHz sample rates.
*/
ics->num_swb = s->samplerate_index >= 8 ? 1 : 3;
} else if (!wi_paired) {
wi[ch] = s->psy.model->window(&s->psy, samples2, la, s->cur_channel,
ics->window_sequence[0]);
}
ics->window_sequence[1] = ics->window_sequence[0];
ics->window_sequence[0] = wi[ch].window_type[0];
ics->use_kb_window[1] = ics->use_kb_window[0];
ics->use_kb_window[0] = wi[ch].window_shape;
ics->num_windows = wi[ch].num_windows;
ics->swb_sizes = s->psy.bands [ics->num_windows == 8];
ics->num_swb = tag == TYPE_LFE ? ics->num_swb : s->psy.num_bands[ics->num_windows == 8];
ics->max_sfb = FFMIN(ics->max_sfb, ics->num_swb);
ics->swb_offset = wi[ch].window_type[0] == EIGHT_SHORT_SEQUENCE ?
ff_swb_offset_128 [s->samplerate_index]:
ff_swb_offset_1024[s->samplerate_index];
ics->tns_max_bands = wi[ch].window_type[0] == EIGHT_SHORT_SEQUENCE ?
ff_tns_max_bands_128 [s->samplerate_index]:
ff_tns_max_bands_1024[s->samplerate_index];
for (w = 0; w < ics->num_windows; w++)
ics->group_len[w] = wi[ch].grouping[w];
/* Calculate input sample maximums and evaluate clipping risk */
clip_avoidance_factor = 0.0f;
for (w = 0; w < ics->num_windows; w++) {
const float *wbuf = overlap + w * 128;
const int wlen = 2048 / ics->num_windows;
float max = 0;
int j;
/* mdct input is 2 * output */
for (j = 0; j < wlen; j++)
max = FFMAX(max, fabsf(wbuf[j]));
wi[ch].clipping[w] = max;
}
for (w = 0; w < ics->num_windows; w++) {
if (wi[ch].clipping[w] > CLIP_AVOIDANCE_FACTOR) {
ics->window_clipping[w] = 1;
clip_avoidance_factor = FFMAX(clip_avoidance_factor, wi[ch].clipping[w]);
} else {
ics->window_clipping[w] = 0;
}
}
if (clip_avoidance_factor > CLIP_AVOIDANCE_FACTOR) {
ics->clip_avoidance_factor = CLIP_AVOIDANCE_FACTOR / clip_avoidance_factor;
} else {
ics->clip_avoidance_factor = 1.0f;
}
apply_window_and_mdct(s, sce, overlap);
for (k = 0; k < 1024; k++) {
if (!(fabs(cpe->ch[ch].coeffs[k]) < 1E16)) { // Ensure headroom for energy calculation
av_log(avctx, AV_LOG_ERROR, "Input contains (near) NaN/+-Inf\n");
return AVERROR(EINVAL);
}
}
avoid_clipping(s, sce);
}
}
start_ch += chans;
}
if ((ret = ff_alloc_packet(avctx, avpkt, 8192 * s->channels)) < 0)
return ret;
frame_bits = its = 0;
do {
init_put_bits(&s->pb, avpkt->data, avpkt->size);
if ((avctx->frame_num & 0xFF)==1 && !(avctx->flags & AV_CODEC_FLAG_BITEXACT))
put_bitstream_info(s, LIBAVCODEC_IDENT);
start_ch = 0;
target_bits = 0;
memset(chan_el_counter, 0, sizeof(chan_el_counter));
for (i = 0; i < s->chan_map[0]; i++) {
FFPsyWindowInfo* wi = windows + start_ch;
const float *coeffs[2];
tag = s->chan_map[i+1];
chans = tag == TYPE_CPE ? 2 : 1;
cpe = &s->cpe[i];
cpe->common_window = 0;
memset(cpe->is_mask, 0, sizeof(cpe->is_mask));
memset(cpe->ms_mask, 0, sizeof(cpe->ms_mask));
put_bits(&s->pb, 3, tag);
put_bits(&s->pb, 4, chan_el_counter[tag]++);
for (ch = 0; ch < chans; ch++) {
sce = &cpe->ch[ch];
coeffs[ch] = sce->coeffs;
memset(&sce->tns, 0, sizeof(TemporalNoiseShaping));
for (w = 0; w < 128; w++)
if (sce->band_type[w] > RESERVED_BT)
sce->band_type[w] = 0;
}
s->psy.bitres.alloc = -1;
s->psy.bitres.bits = s->last_frame_pb_count / s->channels;
s->psy.model->analyze(&s->psy, start_ch, coeffs, wi);
if (s->psy.bitres.alloc > 0) {
/* Lambda unused here on purpose, we need to take psy's unscaled allocation */
target_bits += s->psy.bitres.alloc
* (s->lambda / (avctx->global_quality ? avctx->global_quality : 120));
s->psy.bitres.alloc /= chans;
}
s->cur_type = tag;
if (chans > 1
&& wi[0].window_type[0] == wi[1].window_type[0]
&& wi[0].window_shape == wi[1].window_shape) {
cpe->common_window = 1;
for (w = 0; w < wi[0].num_windows; w++) {
if (wi[0].grouping[w] != wi[1].grouping[w]) {
cpe->common_window = 0;
break;
}
}
}
const int use_tns = s->options.tns && s->coder->search_for_tns &&
s->coder->apply_tns_filt;
/* The NMR coder rate-controls itself and never re-quantizes, so TNS must run
* before the quantizer */
const int tns_first = s->options.coder == AAC_CODER_NMR;
if (tns_first && use_tns) {
for (ch = 0; ch < chans; ch++) {
sce = &cpe->ch[ch];
s->cur_channel = start_ch + ch;
/* mono: mark_pns before TNS so the region cap sees PNS bands. Stereo
* PNS is marked in its own block (below) after the stereo decision. */
if (chans == 1 && s->options.pns && s->coder->mark_pns)
s->coder->mark_pns(s, avctx, sce);
s->coder->search_for_tns(s, sce);
s->coder->apply_tns_filt(s, sce);
if (sce->tns.present)
tns_mode = 1;
}
}
/* NMR stereo PNS (imaging-safe). Mark each channel's noise-like bands on the
* original L/R psy, then keep PNS only where BOTH channels are noise-like. */
if (chans == 2 && cpe->common_window && tns_first &&
s->options.pns && s->coder->mark_pns) {
s->cur_channel = start_ch; s->coder->mark_pns(s, avctx, &cpe->ch[0]);
s->cur_channel = start_ch + 1; s->coder->mark_pns(s, avctx, &cpe->ch[1]);
for (int b = 0; b < 128; b++)
if (!cpe->ch[0].can_pns[b] || !cpe->ch[1].can_pns[b])
cpe->ch[0].can_pns[b] = cpe->ch[1].can_pns[b] = 0;
}
/* The NMR coder decides I/S and M/S BEFORE quantization, from the psy model,
* and the trellis then allocates natively on the coeffs actually coded. */
if (chans == 2 && cpe->common_window && s->options.coder == AAC_CODER_NMR &&
(s->options.mid_side || s->options.intensity_stereo)) {
s->cur_channel = start_ch;
nmr_decide_stereo(s, cpe);
}
/* NMR pools the CPE bit budget: both channels of a pair are solved
* jointly under one shared lambda (see aaccoder_nmr.h). */
if (s->options.coder == AAC_CODER_NMR && s->nmr)
s->nmr->pair = (chans == 2);
for (ch = 0; ch < chans; ch++) {
s->cur_channel = start_ch + ch;
/* NMR PNS is mono-only */
if (s->options.pns && s->coder->mark_pns && !tns_first)
s->coder->mark_pns(s, avctx, &cpe->ch[ch]);
s->coder->search_for_quantizers(avctx, s, &cpe->ch[ch], s->lambda);
}
for (ch = 0; ch < chans; ch++) { /* TNS (non-NMR) and PNS */
sce = &cpe->ch[ch];
s->cur_channel = start_ch + ch;
if (!tns_first && use_tns) {
s->coder->search_for_tns(s, sce);
s->coder->apply_tns_filt(s, sce);
if (sce->tns.present)
tns_mode = 1;
}
if (s->options.pns && s->coder->search_for_pns)
s->coder->search_for_pns(s, avctx, sce);
}
s->cur_channel = start_ch;
if (s->options.intensity_stereo) { /* Intensity Stereo */
if (s->options.coder != AAC_CODER_NMR) { /* NMR: decided pre-search */
if (s->coder->search_for_is)
s->coder->search_for_is(s, avctx, cpe);
apply_intensity_stereo(cpe);
}
if (cpe->is_mode) is_mode = 1;
}
if (s->options.mid_side && s->options.coder != AAC_CODER_NMR) { /* Mid/Side stereo */
if (s->options.mid_side == -1 && s->coder->search_for_ms)
s->coder->search_for_ms(s, cpe);
else if (cpe->common_window)
memset(cpe->ms_mask, 1, sizeof(cpe->ms_mask));
apply_mid_side_stereo(cpe);
}
adjust_frame_information(cpe, chans);
if (chans == 2) {
put_bits(&s->pb, 1, cpe->common_window);
if (cpe->common_window) {
put_ics_info(s, &cpe->ch[0].ics);
encode_ms_info(&s->pb, cpe);
if (cpe->ms_mode) ms_mode = 1;
}
}
for (ch = 0; ch < chans; ch++) {
s->cur_channel = start_ch + ch;
encode_individual_channel(avctx, s, &cpe->ch[ch], cpe->common_window);
}
start_ch += chans;
}
if (avctx->flags & AV_CODEC_FLAG_QSCALE) {
/* When using a constant Q-scale, don't mess with lambda */
break;
}
frame_bits = put_bits_count(&s->pb);
/* The NMR coder rate-controls itself (global-lambda reservoir servo):
* per-frame bits intentionally float around the nominal rate, so skip
* the lambda rate loop and only intervene on a hard overflow. */
if (s->options.coder == AAC_CODER_NMR && avctx->bit_rate_tolerance != 0 &&
frame_bits < 6144 * s->channels - 3)
break;
/* rate control stuff
* allow between the nominal bitrate, and what psy's bit reservoir says to target
* but drift towards the nominal bitrate always
*/
rate_bits = avctx->bit_rate * 1024 / avctx->sample_rate;
rate_bits = FFMIN(rate_bits, 6144 * s->channels - 3);
too_many_bits = FFMAX(target_bits, rate_bits);
too_many_bits = FFMIN(too_many_bits, 6144 * s->channels - 3);
too_few_bits = FFMIN(FFMAX(rate_bits - rate_bits/4, target_bits), too_many_bits);
/* When strict bit-rate control is demanded */
if (avctx->bit_rate_tolerance == 0) {
if (rate_bits < frame_bits) {
float ratio = ((float)rate_bits) / frame_bits;
s->lambda *= FFMIN(0.9f, ratio);
continue;
}
/* reset lambda when solution is found */
s->lambda = avctx->global_quality > 0 ? avctx->global_quality : 120;
break;
}
/* When using ABR, be strict (but only for increasing) */
too_few_bits = too_few_bits - too_few_bits/8;
too_many_bits = too_many_bits + too_many_bits/2;
if ( its == 0 /* for steady-state Q-scale tracking */
|| (its < 5 && (frame_bits < too_few_bits || frame_bits > too_many_bits))
|| frame_bits >= 6144 * s->channels - 3 )
{
float ratio = ((float)rate_bits) / frame_bits;
if (frame_bits >= too_few_bits && frame_bits <= too_many_bits) {
/*
* This path is for steady-state Q-scale tracking
* When frame bits fall within the stable range, we still need to adjust
* lambda to maintain it like so in a stable fashion (large jumps in lambda
* create artifacts and should be avoided), but slowly
*/
ratio = sqrtf(sqrtf(ratio));
ratio = av_clipf(ratio, 0.9f, 1.1f);
} else {
/* Not so fast though */
ratio = sqrtf(ratio);
}
s->lambda = av_clipf(s->lambda * ratio, FLT_EPSILON, 65536.f);
/* Keep iterating if we must reduce and lambda is in the sky */
if (ratio > 0.9f && ratio < 1.1f) {
break;
} else {
if (is_mode || ms_mode || tns_mode || pred_mode) {
for (i = 0; i < s->chan_map[0]; i++) {
// Must restore coeffs
chans = tag == TYPE_CPE ? 2 : 1;
cpe = &s->cpe[i];
for (ch = 0; ch < chans; ch++)
memcpy(cpe->ch[ch].coeffs, cpe->ch[ch].pcoeffs, sizeof(cpe->ch[ch].coeffs));
}
}
its++;
}
} else {
break;
}
} while (1);
/* tool-usage stats over the final per-band decisions of this frame */
for (i = 0; i < s->chan_map[0]; i++) {
int etag = s->chan_map[i + 1], echans = etag == TYPE_CPE ? 2 : 1;
ChannelElement *ce = &s->cpe[i];
IndividualChannelStream *ics = &ce->ch[0].ics;
for (ch = 0; ch < echans; ch++) { /* per-channel frame stats */
int is_short = ce->ch[ch].ics.window_sequence[0] == EIGHT_SHORT_SEQUENCE;
s->stat_chans++;
if (is_short)
s->stat_short++;
if (ce->ch[ch].tns.present) {
if (is_short) s->stat_tns_short++;
else s->stat_tns_long++;
}
}
for (w = 0; w < ics->num_windows; w += ics->group_len[w]) {
for (int g = 0; g < ics->num_swb; g++) {
int idx = w*16 + g, coded = 0;
for (ch = 0; ch < echans; ch++) {
SingleChannelElement *sce = &ce->ch[ch];
if (sce->zeroes[idx] && sce->band_type[idx] == 0)
continue;
s->stat_ch_bands++;
if (sce->band_type[idx] == NOISE_BT)
s->stat_pns++;
coded = 1;
}
if (etag == TYPE_CPE && coded) {
s->stat_cpe_bands++;
if (ce->ms_mask[idx]) s->stat_ms++;
if (ce->is_mask[idx]) s->stat_is++;
}
}
}
}
put_bits(&s->pb, 3, TYPE_END);
flush_put_bits(&s->pb);
s->last_frame_pb_count = put_bits_count(&s->pb);
/* NMR rate accounting: how many bits the frame really took beyond what the
* trellis counted; feeds the next frame's budget correction */
if (s->nmr) {
int counted = 0;
for (i = 0; i < s->channels; i++)
counted += s->nmr->counted[i];
if (counted > 0) {
float side = (float)s->last_frame_pb_count - counted;
if (s->nmr->side_inited) {
s->nmr->side_ema += 0.125f * (side - s->nmr->side_ema);
} else {
s->nmr->side_ema = side;
s->nmr->side_inited = 1;
}
}
}
avpkt->size = put_bytes_output(&s->pb);
s->lambda_sum += (s->nmr && s->nmr->lam_rc > 0.0f) ? s->nmr->lam_rc : s->lambda;
s->lambda_count++;
ret = ff_af_queue_remove(&s->afq, avctx->frame_size, avpkt);
if (ret < 0)
return ret;
avpkt->flags |= AV_PKT_FLAG_KEY;
*got_packet_ptr = 1;
return 0;
}
static av_cold int aac_encode_end(AVCodecContext *avctx)
{
AACEncContext *s = avctx->priv_data;
av_log(avctx, AV_LOG_INFO,
"Qavg: %.3f Tr: %.1f%% TNS(L): %.1f%% TNS(S): %.1f%% M/S: %.1f%% I/S: %.1f%% PNS: %.1f%%\n",
s->lambda_count ? s->lambda_sum / s->lambda_count : NAN,
s->stat_chans ? 100.0 * s->stat_short / s->stat_chans : 0.0,
s->stat_chans - s->stat_short ? 100.0 * s->stat_tns_long / (s->stat_chans - s->stat_short) : 0.0,
s->stat_short ? 100.0 * s->stat_tns_short / s->stat_short : 0.0,
s->stat_cpe_bands ? 100.0 * s->stat_ms / s->stat_cpe_bands : 0.0,
s->stat_cpe_bands ? 100.0 * s->stat_is / s->stat_cpe_bands : 0.0,
s->stat_ch_bands ? 100.0 * s->stat_pns / s->stat_ch_bands : 0.0);
av_tx_uninit(&s->mdct1024);
av_tx_uninit(&s->mdct128);
ff_psy_end(&s->psy);
ff_lpc_end(&s->lpc);
av_freep(&s->buffer.samples);
av_freep(&s->cpe);
av_freep(&s->fdsp);
av_freep(&s->nmr);
ff_af_queue_close(&s->afq);
return 0;
}
static av_cold int dsp_init(AVCodecContext *avctx, AACEncContext *s)
{
int ret = 0;
float scale = 32768.0f;
s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
if (!s->fdsp)
return AVERROR(ENOMEM);
if ((ret = av_tx_init(&s->mdct1024, &s->mdct1024_fn, AV_TX_FLOAT_MDCT, 0,
1024, &scale, 0)) < 0)
return ret;
if ((ret = av_tx_init(&s->mdct128, &s->mdct128_fn, AV_TX_FLOAT_MDCT, 0,
128, &scale, 0)) < 0)
return ret;
return 0;
}
static av_cold int alloc_buffers(AVCodecContext *avctx, AACEncContext *s)
{
int ch;
if (!FF_ALLOCZ_TYPED_ARRAY(s->buffer.samples, s->channels * 3 * 1024) ||
!FF_ALLOCZ_TYPED_ARRAY(s->cpe, s->chan_map[0]))
return AVERROR(ENOMEM);
for(ch = 0; ch < s->channels; ch++)
s->planar_samples[ch] = s->buffer.samples + 3 * 1024 * ch;
if (s->options.coder == AAC_CODER_NMR) {
s->nmr = av_mallocz(sizeof(*s->nmr));
if (!s->nmr)
return AVERROR(ENOMEM);
}
return 0;
}
static av_cold int aac_encode_init(AVCodecContext *avctx)
{
AACEncContext *s = avctx->priv_data;
int i, ret = 0;
int chcfg;
const uint8_t *sizes[2];
uint8_t grouping[AAC_MAX_CHANNELS];
int lengths[2];
/* Constants */
s->last_frame_pb_count = 0;
avctx->frame_size = 1024;
avctx->initial_padding = 1024;
s->lambda = avctx->global_quality > 0 ? avctx->global_quality : 120;
/* Channel map and unspecified bitrate guessing */
s->channels = avctx->ch_layout.nb_channels;
s->needs_pce = 1;
for (chcfg = 1; chcfg < FF_ARRAY_ELEMS(aac_normal_chan_layouts); chcfg++) {
if (!av_channel_layout_compare(&avctx->ch_layout, &aac_normal_chan_layouts[chcfg])) {
s->needs_pce = s->options.pce;
break;
}
}
if (s->needs_pce) {
char buf[64];
for (i = 0; i < FF_ARRAY_ELEMS(aac_pce_configs); i++)
if (!av_channel_layout_compare(&avctx->ch_layout, &aac_pce_configs[i].layout))
break;
av_channel_layout_describe(&avctx->ch_layout, buf, sizeof(buf));
if (i == FF_ARRAY_ELEMS(aac_pce_configs)) {
av_log(avctx, AV_LOG_ERROR, "Unsupported channel layout \"%s\"\n", buf);
return AVERROR(EINVAL);
}
av_log(avctx, AV_LOG_INFO, "Using a PCE to encode channel layout \"%s\"\n", buf);
s->pce = aac_pce_configs[i];
s->reorder_map = s->pce.reorder_map;
s->chan_map = s->pce.config_map;
chcfg = 0;
} else {
s->reorder_map = aac_chan_maps[chcfg - 1];
s->chan_map = aac_chan_configs[chcfg - 1];
}
if (!avctx->bit_rate) {
for (i = 1; i <= s->chan_map[0]; i++) {
avctx->bit_rate += s->chan_map[i] == TYPE_CPE ? 128000 : /* Pair */
s->chan_map[i] == TYPE_LFE ? 16000 : /* LFE */
69000 ; /* SCE */
}
}
/* Samplerate */
for (int i = 0;; i++) {
av_assert1(i < 13);
if (avctx->sample_rate == ff_mpeg4audio_sample_rates[i]) {
s->samplerate_index = i;
break;
}
}
/* Bitrate limiting */
WARN_IF(1024.0 * avctx->bit_rate / avctx->sample_rate > 6144 * s->channels,
"Too many bits %f > %d per frame requested, clamping to max\n",
1024.0 * avctx->bit_rate / avctx->sample_rate,
6144 * s->channels);
avctx->bit_rate = (int64_t)FFMIN(6144 * s->channels / 1024.0 * avctx->sample_rate,
avctx->bit_rate);
/* Profile and option setting */
avctx->profile = avctx->profile == AV_PROFILE_UNKNOWN ? AV_PROFILE_AAC_LOW :
avctx->profile;
for (i = 0; i < FF_ARRAY_ELEMS(aacenc_profiles); i++)
if (avctx->profile == aacenc_profiles[i])
break;
ERROR_IF(i == FF_ARRAY_ELEMS(aacenc_profiles), "Profile not supported!\n");
if (avctx->profile == AV_PROFILE_MPEG2_AAC_LOW) {
avctx->profile = AV_PROFILE_AAC_LOW;
WARN_IF(s->options.pns,
"PNS unavailable in the \"mpeg2_aac_low\" profile, turning off\n");
s->options.pns = 0;
}
s->profile = avctx->profile;
/* Coder limitations */
s->coder = &ff_aac_coders[s->options.coder];
/* M/S introduces horrible artifacts with multichannel files, this is temporary */
if (s->channels > 3)
s->options.mid_side = 0;
/* Coding bandwidth, fixed at init time */
if (avctx->cutoff > 0) {
s->bandwidth = avctx->cutoff;
} else {
int frame_br = (avctx->flags & AV_CODEC_FLAG_QSCALE) ?
(avctx->bit_rate / 2.0f * (s->lambda / 120.f) * 1.5f) :
(avctx->bit_rate / avctx->ch_layout.nb_channels);
if (s->options.coder == AAC_CODER_NMR && frame_br >= 24000) {
static const int rates[] = { 24000, 32000, 48000, 64000, 96000, 192000 };
static const int bws[] = { 14000, 14000, 18500, 20000, 21000, 22000 };
int bw_i = 0;
for (; bw_i < FF_ARRAY_ELEMS(rates) - 2 && frame_br > rates[bw_i + 1]; bw_i++);
s->bandwidth = bws[bw_i] + (int)((int64_t)(bws[bw_i + 1] - bws[bw_i]) *
(frame_br - rates[bw_i]) / (rates[bw_i + 1] - rates[bw_i]));
s->bandwidth = FFMIN3(s->bandwidth, 22000, avctx->sample_rate / 2);
} else {
if (s->options.pns || s->options.intensity_stereo)
frame_br *= 1.15f;
s->bandwidth = FFMAX(3000, AAC_CUTOFF_FROM_BITRATE(frame_br, 1,
avctx->sample_rate));
}
s->bandwidth = FFMIN(FFMAX(s->bandwidth, 8000), avctx->sample_rate / 2);
}
if (!(avctx->flags & AV_CODEC_FLAG_QSCALE) && avctx->bit_rate > 0) {
int bpc = avctx->bit_rate / avctx->ch_layout.nb_channels;
if (bpc <= 32000 && avctx->sample_rate > 32000)
av_log(avctx, AV_LOG_INFO,
"%d kb/s per channel at %d Hz: consider resampling the "
"input to 32000 Hz or lower for better quality.\n",
bpc / 1000, avctx->sample_rate);
}
// Initialize static tables
ff_aac_float_common_init();
if ((ret = dsp_init(avctx, s)) < 0)
return ret;
if ((ret = alloc_buffers(avctx, s)) < 0)
return ret;
if ((ret = put_audio_specific_config(avctx, chcfg)))
return ret;
sizes[0] = ff_aac_swb_size_1024[s->samplerate_index];
sizes[1] = ff_aac_swb_size_128[s->samplerate_index];
lengths[0] = ff_aac_num_swb_1024[s->samplerate_index];
lengths[1] = ff_aac_num_swb_128[s->samplerate_index];
for (i = 0; i < s->chan_map[0]; i++)
grouping[i] = s->chan_map[i + 1] == TYPE_CPE;
if ((ret = ff_psy_init(&s->psy, avctx, 2, sizes, lengths,
s->chan_map[0], grouping, s->bandwidth)) < 0)
return ret;
ff_lpc_init(&s->lpc, 2*avctx->frame_size, TNS_MAX_ORDER, FF_LPC_TYPE_LEVINSON);
s->random_state = 0x1f2e3d4c;
ff_aacenc_dsp_init(&s->aacdsp);
ff_af_queue_init(avctx, &s->afq);
return 0;
}
#define AACENC_FLAGS AV_OPT_FLAG_ENCODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM
static const AVOption aacenc_options[] = {
{"aac_coder", "Coding algorithm", offsetof(AACEncContext, options.coder), AV_OPT_TYPE_INT, {.i64 = AAC_CODER_NMR}, 0, AAC_CODER_NB-1, AACENC_FLAGS, .unit = "coder"},
{"twoloop", "Two loop searching method", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_TWOLOOP}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "coder"},
{"fast", "Fast search", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_FAST}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "coder"},
{"nmr", "Noise-to-mask ratio scalefactor trellis", 0, AV_OPT_TYPE_CONST, {.i64 = AAC_CODER_NMR}, INT_MIN, INT_MAX, AACENC_FLAGS, .unit = "coder"},
{"aac_ms", "Force M/S stereo coding", offsetof(AACEncContext, options.mid_side), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, AACENC_FLAGS},
{"aac_is", "Intensity stereo coding", offsetof(AACEncContext, options.intensity_stereo), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
{"aac_pns", "Perceptual noise substitution", offsetof(AACEncContext, options.pns), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
{"aac_tns", "Temporal noise shaping", offsetof(AACEncContext, options.tns), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AACENC_FLAGS},
{"aac_pce", "Forces the use of PCEs", offsetof(AACEncContext, options.pce), AV_OPT_TYPE_BOOL, {.i64 = 0}, -1, 1, AACENC_FLAGS},
{"aac_nmr_speed", "NMR coder speed level: 0 = slowest/best, higher trades quality for speed", offsetof(AACEncContext, options.nmr_speed), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 4, AACENC_FLAGS},
FF_AAC_PROFILE_OPTS
{NULL}
};
static const AVClass aacenc_class = {
.class_name = "AAC encoder",
.item_name = av_default_item_name,
.option = aacenc_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const FFCodecDefault aac_encode_defaults[] = {
{ "b", "0" },
{ NULL }
};
const FFCodec ff_aac_encoder = {
.p.name = "aac",
CODEC_LONG_NAME("AAC (Advanced Audio Coding)"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_AAC,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_SMALL_LAST_FRAME,
.priv_data_size = sizeof(AACEncContext),
.init = aac_encode_init,
FF_CODEC_ENCODE_CB(aac_encode_frame),
.close = aac_encode_end,
.defaults = aac_encode_defaults,
CODEC_SAMPLERATES_ARRAY(ff_mpeg4audio_sample_rates),
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP),
.p.priv_class = &aacenc_class,
};
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