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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 "avformat.h"
#include "iamf.h"
#include "iamf_writer.h"
#include "internal.h"
#include "mux.h"
typedef struct IAMFMuxContext {
IAMFContext iamf;
int64_t descriptors_offset;
int update_extradata;
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;
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 <= 1) {
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;
c->descriptors_offset = avio_tell(s->pb);
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 int iamf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
IAMFMuxContext *const c = s->priv_data;
AVStream *st = s->streams[pkt->stream_index];
int ret = 0;
if (st->id == c->first_stream_id)
ret = ff_iamf_write_parameter_blocks(&c->iamf, s->pb, pkt, s);
if (!ret)
ret = ff_iamf_write_audio_frame(&c->iamf, s->pb, st->id, pkt);
if (!ret && !pkt->size)
c->update_extradata = 1;
return ret;
}
static int iamf_write_trailer(AVFormatContext *s)
{
const IAMFMuxContext *const c = s->priv_data;
const IAMFContext *const iamf = &c->iamf;
int64_t pos;
int ret;
if (!c->update_extradata || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
return 0;
pos = avio_tell(s->pb);
avio_seek(s->pb, c->descriptors_offset, SEEK_SET);
ret = ff_iamf_write_descriptors(iamf, s->pb, s);
if (ret < 0)
return ret;
avio_seek(s->pb, pos, SEEK_SET);
return 0;
}
static void iamf_deinit(AVFormatContext *s)
{
IAMFMuxContext *const c = s->priv_data;
IAMFContext *const iamf = &c->iamf;
ff_iamf_uninit_context(iamf);
}
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,
.write_trailer = iamf_write_trailer,
.p.codec_tag = (const AVCodecTag* const []){ iamf_codec_tags, NULL },
.p.flags = AVFMT_GLOBALHEADER | AVFMT_NOTIMESTAMPS,
};
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