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ffmpeg/libavformat/iamfenc.c

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/*
* IAMF muxer
* Copyright (c) 2023 James Almer
*
* 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 <stdint.h>
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/iamf.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/put_bits.h"
#include "avformat.h"
#include "avio_internal.h"
#include "iamf.h"
#include "iamf_writer.h"
#include "internal.h"
#include "mux.h"
typedef struct IAMFMuxContext {
IAMFContext iamf;
int first_stream_id;
} IAMFMuxContext;
static int iamf_init(AVFormatContext *s)
{
IAMFMuxContext *const c = s->priv_data;
IAMFContext *const iamf = &c->iamf;
int nb_audio_elements = 0, nb_mix_presentations = 0;
int ret;
if (!s->nb_streams) {
av_log(s, AV_LOG_ERROR, "There must be at least one stream\n");
return AVERROR(EINVAL);
}
for (int i = 0; i < s->nb_streams; i++) {
if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO ||
(s->streams[i]->codecpar->codec_tag != MKTAG('m','p','4','a') &&
s->streams[i]->codecpar->codec_tag != MKTAG('O','p','u','s') &&
s->streams[i]->codecpar->codec_tag != MKTAG('f','L','a','C') &&
s->streams[i]->codecpar->codec_tag != MKTAG('i','p','c','m'))) {
av_log(s, AV_LOG_ERROR, "Unsupported codec id %s\n",
avcodec_get_name(s->streams[i]->codecpar->codec_id));
return AVERROR(EINVAL);
}
if (s->streams[i]->codecpar->ch_layout.nb_channels > 2) {
av_log(s, AV_LOG_ERROR, "Unsupported channel layout on stream #%d\n", i);
return AVERROR(EINVAL);
}
for (int j = 0; j < i; j++) {
if (s->streams[i]->id == s->streams[j]->id) {
av_log(s, AV_LOG_ERROR, "Duplicated stream id %d\n", s->streams[j]->id);
return AVERROR(EINVAL);
}
}
}
if (!s->nb_stream_groups) {
av_log(s, AV_LOG_ERROR, "There must be at least two stream groups\n");
return AVERROR(EINVAL);
}
for (int i = 0; i < s->nb_stream_groups; i++) {
const AVStreamGroup *stg = s->stream_groups[i];
if (stg->type == AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT)
nb_audio_elements++;
if (stg->type == AV_STREAM_GROUP_PARAMS_IAMF_MIX_PRESENTATION)
nb_mix_presentations++;
}
if ((nb_audio_elements < 1 || nb_audio_elements > 2) || nb_mix_presentations < 1) {
av_log(s, AV_LOG_ERROR, "There must be >= 1 and <= 2 IAMF_AUDIO_ELEMENT and at least "
"one IAMF_MIX_PRESENTATION stream groups\n");
return AVERROR(EINVAL);
}
for (int i = 0; i < s->nb_stream_groups; i++) {
const AVStreamGroup *stg = s->stream_groups[i];
if (stg->type != AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT)
continue;
ret = ff_iamf_add_audio_element(iamf, stg, s);
if (ret < 0)
return ret;
}
for (int i = 0; i < s->nb_stream_groups; i++) {
const AVStreamGroup *stg = s->stream_groups[i];
if (stg->type != AV_STREAM_GROUP_PARAMS_IAMF_MIX_PRESENTATION)
continue;
ret = ff_iamf_add_mix_presentation(iamf, stg, s);
if (ret < 0)
return ret;
}
c->first_stream_id = s->streams[0]->id;
return 0;
}
static int iamf_write_header(AVFormatContext *s)
{
IAMFMuxContext *const c = s->priv_data;
IAMFContext *const iamf = &c->iamf;
int ret;
ret = ff_iamf_write_descriptors(iamf, s->pb, s);
if (ret < 0)
return ret;
c->first_stream_id = s->streams[0]->id;
return 0;
}
static inline int rescale_rational(AVRational q, int b)
{
return av_clip_int16(av_rescale(q.num, b, q.den));
}
static int write_parameter_block(AVFormatContext *s, const AVIAMFParamDefinition *param)
{
const IAMFMuxContext *const c = s->priv_data;
const IAMFContext *const iamf = &c->iamf;
uint8_t header[MAX_IAMF_OBU_HEADER_SIZE];
IAMFParamDefinition *param_definition = ff_iamf_get_param_definition(iamf, param->parameter_id);
PutBitContext pb;
AVIOContext *dyn_bc;
uint8_t *dyn_buf = NULL;
int dyn_size, ret;
if (param->type > AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN) {
av_log(s, AV_LOG_DEBUG, "Ignoring side data with unknown type %u\n",
param->type);
return 0;
}
if (!param_definition) {
av_log(s, AV_LOG_ERROR, "Non-existent Parameter Definition with ID %u referenced by a packet\n",
param->parameter_id);
return AVERROR(EINVAL);
}
if (param->type != param_definition->param->type) {
av_log(s, AV_LOG_ERROR, "Inconsistent values for Parameter Definition "
"with ID %u in a packet\n",
param->parameter_id);
return AVERROR(EINVAL);
}
ret = avio_open_dyn_buf(&dyn_bc);
if (ret < 0)
return ret;
// Sequence Header
init_put_bits(&pb, header, sizeof(header));
put_bits(&pb, 5, IAMF_OBU_IA_PARAMETER_BLOCK);
put_bits(&pb, 3, 0);
flush_put_bits(&pb);
avio_write(s->pb, header, put_bytes_count(&pb, 1));
ffio_write_leb(dyn_bc, param->parameter_id);
if (!param_definition->mode) {
ffio_write_leb(dyn_bc, param->duration);
ffio_write_leb(dyn_bc, param->constant_subblock_duration);
if (param->constant_subblock_duration == 0)
ffio_write_leb(dyn_bc, param->nb_subblocks);
}
for (int i = 0; i < param->nb_subblocks; i++) {
const void *subblock = av_iamf_param_definition_get_subblock(param, i);
switch (param->type) {
case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN: {
const AVIAMFMixGain *mix = subblock;
if (!param_definition->mode && param->constant_subblock_duration == 0)
ffio_write_leb(dyn_bc, mix->subblock_duration);
ffio_write_leb(dyn_bc, mix->animation_type);
avio_wb16(dyn_bc, rescale_rational(mix->start_point_value, 1 << 8));
if (mix->animation_type >= AV_IAMF_ANIMATION_TYPE_LINEAR)
avio_wb16(dyn_bc, rescale_rational(mix->end_point_value, 1 << 8));
if (mix->animation_type == AV_IAMF_ANIMATION_TYPE_BEZIER) {
avio_wb16(dyn_bc, rescale_rational(mix->control_point_value, 1 << 8));
avio_w8(dyn_bc, av_clip_uint8(av_rescale(mix->control_point_relative_time.num, 1 << 8,
mix->control_point_relative_time.den)));
}
break;
}
case AV_IAMF_PARAMETER_DEFINITION_DEMIXING: {
const AVIAMFDemixingInfo *demix = subblock;
if (!param_definition->mode && param->constant_subblock_duration == 0)
ffio_write_leb(dyn_bc, demix->subblock_duration);
avio_w8(dyn_bc, demix->dmixp_mode << 5);
break;
}
case AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN: {
const AVIAMFReconGain *recon = subblock;
const AVIAMFAudioElement *audio_element = param_definition->audio_element->element;
if (!param_definition->mode && param->constant_subblock_duration == 0)
ffio_write_leb(dyn_bc, recon->subblock_duration);
if (!audio_element) {
av_log(s, AV_LOG_ERROR, "Invalid Parameter Definition with ID %u referenced by a packet\n", param->parameter_id);
return AVERROR(EINVAL);
}
for (int j = 0; j < audio_element->nb_layers; j++) {
const AVIAMFLayer *layer = audio_element->layers[j];
if (layer->flags & AV_IAMF_LAYER_FLAG_RECON_GAIN) {
unsigned int recon_gain_flags = 0;
int k = 0;
for (; k < 7; k++)
recon_gain_flags |= (1 << k) * !!recon->recon_gain[j][k];
for (; k < 12; k++)
recon_gain_flags |= (2 << k) * !!recon->recon_gain[j][k];
if (recon_gain_flags >> 8)
recon_gain_flags |= (1 << k);
ffio_write_leb(dyn_bc, recon_gain_flags);
for (k = 0; k < 12; k++) {
if (recon->recon_gain[j][k])
avio_w8(dyn_bc, recon->recon_gain[j][k]);
}
}
}
break;
}
default:
av_assert0(0);
}
}
dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
ffio_write_leb(s->pb, dyn_size);
avio_write(s->pb, dyn_buf, dyn_size);
av_free(dyn_buf);
return 0;
}
static int iamf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
const IAMFMuxContext *const c = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
uint8_t header[MAX_IAMF_OBU_HEADER_SIZE];
PutBitContext pb;
AVIOContext *dyn_bc;
uint8_t *side_data, *dyn_buf = NULL;
unsigned int skip_samples = 0, discard_padding = 0;
size_t side_data_size;
int dyn_size, type = st->id <= 17 ? st->id + IAMF_OBU_IA_AUDIO_FRAME_ID0 : IAMF_OBU_IA_AUDIO_FRAME;
int ret;
if (s->nb_stream_groups && st->id == c->first_stream_id) {
AVIAMFParamDefinition *mix =
(AVIAMFParamDefinition *)av_packet_get_side_data(pkt, AV_PKT_DATA_IAMF_MIX_GAIN_PARAM, NULL);
AVIAMFParamDefinition *demix =
(AVIAMFParamDefinition *)av_packet_get_side_data(pkt, AV_PKT_DATA_IAMF_DEMIXING_INFO_PARAM, NULL);
AVIAMFParamDefinition *recon =
(AVIAMFParamDefinition *)av_packet_get_side_data(pkt, AV_PKT_DATA_IAMF_RECON_GAIN_INFO_PARAM, NULL);
if (mix) {
ret = write_parameter_block(s, mix);
if (ret < 0)
return ret;
}
if (demix) {
ret = write_parameter_block(s, demix);
if (ret < 0)
return ret;
}
if (recon) {
ret = write_parameter_block(s, recon);
if (ret < 0)
return ret;
}
}
side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES,
&side_data_size);
if (side_data && side_data_size >= 10) {
skip_samples = AV_RL32(side_data);
discard_padding = AV_RL32(side_data + 4);
}
ret = avio_open_dyn_buf(&dyn_bc);
if (ret < 0)
return ret;
init_put_bits(&pb, header, sizeof(header));
put_bits(&pb, 5, type);
put_bits(&pb, 1, 0); // obu_redundant_copy
put_bits(&pb, 1, skip_samples || discard_padding);
put_bits(&pb, 1, 0); // obu_extension_flag
flush_put_bits(&pb);
avio_write(s->pb, header, put_bytes_count(&pb, 1));
if (skip_samples || discard_padding) {
ffio_write_leb(dyn_bc, discard_padding);
ffio_write_leb(dyn_bc, skip_samples);
}
if (st->id > 17)
ffio_write_leb(dyn_bc, st->id);
dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
ffio_write_leb(s->pb, dyn_size + pkt->size);
avio_write(s->pb, dyn_buf, dyn_size);
av_free(dyn_buf);
avio_write(s->pb, pkt->data, pkt->size);
return 0;
}
static void iamf_deinit(AVFormatContext *s)
{
IAMFMuxContext *const c = s->priv_data;
IAMFContext *const iamf = &c->iamf;
for (int i = 0; i < iamf->nb_audio_elements; i++) {
IAMFAudioElement *audio_element = iamf->audio_elements[i];
audio_element->element = NULL;
}
for (int i = 0; i < iamf->nb_mix_presentations; i++) {
IAMFMixPresentation *mix_presentation = iamf->mix_presentations[i];
mix_presentation->mix = NULL;
}
ff_iamf_uninit_context(iamf);
return;
}
static const AVCodecTag iamf_codec_tags[] = {
{ AV_CODEC_ID_AAC, MKTAG('m','p','4','a') },
{ AV_CODEC_ID_FLAC, MKTAG('f','L','a','C') },
{ AV_CODEC_ID_OPUS, MKTAG('O','p','u','s') },
{ AV_CODEC_ID_PCM_S16LE, MKTAG('i','p','c','m') },
{ AV_CODEC_ID_PCM_S16BE, MKTAG('i','p','c','m') },
{ AV_CODEC_ID_PCM_S24LE, MKTAG('i','p','c','m') },
{ AV_CODEC_ID_PCM_S24BE, MKTAG('i','p','c','m') },
{ AV_CODEC_ID_PCM_S32LE, MKTAG('i','p','c','m') },
{ AV_CODEC_ID_PCM_S32BE, MKTAG('i','p','c','m') },
{ AV_CODEC_ID_NONE, MKTAG('i','p','c','m') }
};
const FFOutputFormat ff_iamf_muxer = {
.p.name = "iamf",
.p.long_name = NULL_IF_CONFIG_SMALL("Raw Immersive Audio Model and Formats"),
.p.extensions = "iamf",
.priv_data_size = sizeof(IAMFMuxContext),
.p.audio_codec = AV_CODEC_ID_OPUS,
.init = iamf_init,
.deinit = iamf_deinit,
.write_header = iamf_write_header,
.write_packet = iamf_write_packet,
.p.codec_tag = (const AVCodecTag* const []){ iamf_codec_tags, NULL },
.p.flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS,
};
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