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ffmpeg/libavformat/iamfdec.c

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/*
* Immersive Audio Model and Formats demuxer
* Copyright (c) 2023 James Almer <jamrial@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 "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/iamf.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavcodec/mathops.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "iamf.h"
#include "iamf_parse.h"
#include "internal.h"
typedef struct IAMFDemuxContext {
IAMFContext iamf;
// Packet side data
AVIAMFParamDefinition *mix;
size_t mix_size;
AVIAMFParamDefinition *demix;
size_t demix_size;
AVIAMFParamDefinition *recon;
size_t recon_size;
} IAMFDemuxContext;
static AVStream *find_stream_by_id(AVFormatContext *s, int id)
{
for (int i = 0; i < s->nb_streams; i++)
if (s->streams[i]->id == id)
return s->streams[i];
av_log(s, AV_LOG_ERROR, "Invalid stream id %d\n", id);
return NULL;
}
static int audio_frame_obu(AVFormatContext *s, AVPacket *pkt, int len,
enum IAMF_OBU_Type type,
unsigned skip_samples, unsigned discard_padding,
int id_in_bitstream)
{
const IAMFDemuxContext *const c = s->priv_data;
AVStream *st;
int ret, audio_substream_id;
if (id_in_bitstream) {
unsigned explicit_audio_substream_id;
int64_t pos = avio_tell(s->pb);
explicit_audio_substream_id = ffio_read_leb(s->pb);
len -= avio_tell(s->pb) - pos;
audio_substream_id = explicit_audio_substream_id;
} else
audio_substream_id = type - IAMF_OBU_IA_AUDIO_FRAME_ID0;
st = find_stream_by_id(s, audio_substream_id);
if (!st)
return AVERROR_INVALIDDATA;
ret = av_get_packet(s->pb, pkt, len);
if (ret < 0)
return ret;
if (ret != len)
return AVERROR_INVALIDDATA;
if (skip_samples || discard_padding) {
uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
if (!side_data)
return AVERROR(ENOMEM);
AV_WL32(side_data, skip_samples);
AV_WL32(side_data + 4, discard_padding);
}
if (c->mix) {
uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_IAMF_MIX_GAIN_PARAM, c->mix_size);
if (!side_data)
return AVERROR(ENOMEM);
memcpy(side_data, c->mix, c->mix_size);
}
if (c->demix) {
uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_IAMF_DEMIXING_INFO_PARAM, c->demix_size);
if (!side_data)
return AVERROR(ENOMEM);
memcpy(side_data, c->demix, c->demix_size);
}
if (c->recon) {
uint8_t *side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_IAMF_RECON_GAIN_INFO_PARAM, c->recon_size);
if (!side_data)
return AVERROR(ENOMEM);
memcpy(side_data, c->recon, c->recon_size);
}
pkt->stream_index = st->index;
return 0;
}
static const IAMFParamDefinition *get_param_definition(AVFormatContext *s, unsigned int parameter_id)
{
const IAMFDemuxContext *const c = s->priv_data;
const IAMFContext *const iamf = &c->iamf;
const IAMFParamDefinition *param_definition = NULL;
for (int i = 0; i < iamf->nb_param_definitions; i++)
if (iamf->param_definitions[i]->param->parameter_id == parameter_id) {
param_definition = iamf->param_definitions[i];
break;
}
return param_definition;
}
static int parameter_block_obu(AVFormatContext *s, int len)
{
IAMFDemuxContext *const c = s->priv_data;
const IAMFParamDefinition *param_definition;
const AVIAMFParamDefinition *param;
AVIAMFParamDefinition *out_param = NULL;
FFIOContext b;
AVIOContext *pb;
uint8_t *buf;
unsigned int duration, constant_subblock_duration;
unsigned int nb_subblocks;
unsigned int parameter_id;
size_t out_param_size;
int ret;
buf = av_malloc(len);
if (!buf)
return AVERROR(ENOMEM);
ret = avio_read(s->pb, buf, len);
if (ret != len) {
if (ret >= 0)
ret = AVERROR_INVALIDDATA;
goto fail;
}
ffio_init_context(&b, buf, len, 0, NULL, NULL, NULL, NULL);
pb = &b.pub;
parameter_id = ffio_read_leb(pb);
param_definition = get_param_definition(s, parameter_id);
if (!param_definition) {
av_log(s, AV_LOG_VERBOSE, "Non existant parameter_id %d referenced in a parameter block. Ignoring\n",
parameter_id);
ret = 0;
goto fail;
}
param = param_definition->param;
if (!param_definition->mode) {
duration = ffio_read_leb(pb);
if (!duration) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
constant_subblock_duration = ffio_read_leb(pb);
if (constant_subblock_duration == 0)
nb_subblocks = ffio_read_leb(pb);
else
nb_subblocks = duration / constant_subblock_duration;
} else {
duration = param->duration;
constant_subblock_duration = param->constant_subblock_duration;
nb_subblocks = param->nb_subblocks;
}
out_param = av_iamf_param_definition_alloc(param->type, nb_subblocks, &out_param_size);
if (!out_param) {
ret = AVERROR(ENOMEM);
goto fail;
}
out_param->parameter_id = param->parameter_id;
out_param->type = param->type;
out_param->parameter_rate = param->parameter_rate;
out_param->duration = duration;
out_param->constant_subblock_duration = constant_subblock_duration;
out_param->nb_subblocks = nb_subblocks;
for (int i = 0; i < nb_subblocks; i++) {
void *subblock = av_iamf_param_definition_get_subblock(out_param, i);
unsigned int subblock_duration = constant_subblock_duration;
if (!param_definition->mode && !constant_subblock_duration)
subblock_duration = ffio_read_leb(pb);
switch (param->type) {
case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN: {
AVIAMFMixGain *mix = subblock;
mix->animation_type = ffio_read_leb(pb);
if (mix->animation_type > AV_IAMF_ANIMATION_TYPE_BEZIER) {
ret = 0;
av_free(out_param);
goto fail;
}
mix->start_point_value = av_make_q(sign_extend(avio_rb16(pb), 16), 1 << 8);
if (mix->animation_type >= AV_IAMF_ANIMATION_TYPE_LINEAR)
mix->end_point_value = av_make_q(sign_extend(avio_rb16(pb), 16), 1 << 8);
if (mix->animation_type == AV_IAMF_ANIMATION_TYPE_BEZIER) {
mix->control_point_value = av_make_q(sign_extend(avio_rb16(pb), 16), 1 << 8);
mix->control_point_relative_time = av_make_q(avio_r8(pb), 1 << 8);
}
mix->subblock_duration = subblock_duration;
break;
}
case AV_IAMF_PARAMETER_DEFINITION_DEMIXING: {
AVIAMFDemixingInfo *demix = subblock;
demix->dmixp_mode = avio_r8(pb) >> 5;
demix->subblock_duration = subblock_duration;
break;
}
case AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN: {
AVIAMFReconGain *recon = subblock;
const IAMFAudioElement *audio_element = param_definition->audio_element;
const AVIAMFAudioElement *element = audio_element->element;
av_assert0(audio_element && element);
for (int i = 0; i < element->nb_layers; i++) {
const AVIAMFLayer *layer = element->layers[i];
if (layer->flags & AV_IAMF_LAYER_FLAG_RECON_GAIN) {
unsigned int recon_gain_flags = ffio_read_leb(pb);
unsigned int bitcount = 7 + 5 * !!(recon_gain_flags & 0x80);
recon_gain_flags = (recon_gain_flags & 0x7F) | ((recon_gain_flags & 0xFF00) >> 1);
for (int j = 0; j < bitcount; j++) {
if (recon_gain_flags & (1 << j))
recon->recon_gain[i][j] = avio_r8(pb);
}
}
}
recon->subblock_duration = subblock_duration;
break;
}
default:
av_assert0(0);
}
}
len -= avio_tell(pb);
if (len) {
int level = (s->error_recognition & AV_EF_EXPLODE) ? AV_LOG_ERROR : AV_LOG_WARNING;
av_log(s, level, "Underread in parameter_block_obu. %d bytes left at the end\n", len);
}
switch (param->type) {
case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN:
av_free(c->mix);
c->mix = out_param;
c->mix_size = out_param_size;
break;
case AV_IAMF_PARAMETER_DEFINITION_DEMIXING:
av_free(c->demix);
c->demix = out_param;
c->demix_size = out_param_size;
break;
case AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN:
av_free(c->recon);
c->recon = out_param;
c->recon_size = out_param_size;
break;
default:
av_assert0(0);
}
ret = 0;
fail:
if (ret < 0)
av_free(out_param);
av_free(buf);
return ret;
}
static int iamf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
IAMFDemuxContext *const c = s->priv_data;
uint8_t header[MAX_IAMF_OBU_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
unsigned obu_size;
int ret;
while (1) {
enum IAMF_OBU_Type type;
unsigned skip_samples, discard_padding;
int len, size, start_pos;
if ((ret = ffio_ensure_seekback(s->pb, MAX_IAMF_OBU_HEADER_SIZE)) < 0)
return ret;
size = avio_read(s->pb, header, MAX_IAMF_OBU_HEADER_SIZE);
if (size < 0)
return size;
len = ff_iamf_parse_obu_header(header, size, &obu_size, &start_pos, &type,
&skip_samples, &discard_padding);
if (len < 0) {
av_log(s, AV_LOG_ERROR, "Failed to read obu\n");
return len;
}
avio_seek(s->pb, -(size - start_pos), SEEK_CUR);
if (type >= IAMF_OBU_IA_AUDIO_FRAME && type <= IAMF_OBU_IA_AUDIO_FRAME_ID17)
return audio_frame_obu(s, pkt, obu_size, type,
skip_samples, discard_padding,
type == IAMF_OBU_IA_AUDIO_FRAME);
else if (type == IAMF_OBU_IA_PARAMETER_BLOCK) {
ret = parameter_block_obu(s, obu_size);
if (ret < 0)
return ret;
} else if (type == IAMF_OBU_IA_TEMPORAL_DELIMITER) {
av_freep(&c->mix);
c->mix_size = 0;
av_freep(&c->demix);
c->demix_size = 0;
av_freep(&c->recon);
c->recon_size = 0;
} else {
int64_t offset = avio_skip(s->pb, obu_size);
if (offset < 0) {
ret = offset;
break;
}
}
}
return ret;
}
//return < 0 if we need more data
static int get_score(const uint8_t *buf, int buf_size, enum IAMF_OBU_Type type, int *seq)
{
if (type == IAMF_OBU_IA_SEQUENCE_HEADER) {
if (buf_size < 4 || AV_RB32(buf) != MKBETAG('i','a','m','f'))
return 0;
*seq = 1;
return -1;
}
if (type >= IAMF_OBU_IA_CODEC_CONFIG && type <= IAMF_OBU_IA_TEMPORAL_DELIMITER)
return *seq ? -1 : 0;
if (type >= IAMF_OBU_IA_AUDIO_FRAME && type <= IAMF_OBU_IA_AUDIO_FRAME_ID17)
return *seq ? AVPROBE_SCORE_EXTENSION + 1 : 0;
return 0;
}
static int iamf_probe(const AVProbeData *p)
{
unsigned obu_size;
enum IAMF_OBU_Type type;
int seq = 0, cnt = 0, start_pos;
int ret;
while (1) {
int size = ff_iamf_parse_obu_header(p->buf + cnt, p->buf_size - cnt,
&obu_size, &start_pos, &type,
NULL, NULL);
if (size < 0)
return 0;
ret = get_score(p->buf + cnt + start_pos,
p->buf_size - cnt - start_pos,
type, &seq);
if (ret >= 0)
return ret;
cnt += FFMIN(size, p->buf_size - cnt);
}
return 0;
}
static int iamf_read_header(AVFormatContext *s)
{
IAMFDemuxContext *const c = s->priv_data;
IAMFContext *const iamf = &c->iamf;
int ret;
ret = ff_iamfdec_read_descriptors(iamf, s->pb, INT_MAX, s);
if (ret < 0)
return ret;
for (int i = 0; i < iamf->nb_audio_elements; i++) {
IAMFAudioElement *audio_element = iamf->audio_elements[i];
AVStreamGroup *stg = avformat_stream_group_create(s, AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT, NULL);
if (!stg)
return AVERROR(ENOMEM);
stg->id = audio_element->audio_element_id;
stg->params.iamf_audio_element = audio_element->element;
for (int j = 0; j < audio_element->nb_substreams; j++) {
IAMFSubStream *substream = &audio_element->substreams[j];
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
ret = avformat_stream_group_add_stream(stg, st);
if (ret < 0)
return ret;
ret = avcodec_parameters_copy(st->codecpar, substream->codecpar);
if (ret < 0)
return ret;
st->id = substream->audio_substream_id;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
}
}
for (int i = 0; i < iamf->nb_mix_presentations; i++) {
IAMFMixPresentation *mix_presentation = iamf->mix_presentations[i];
AVStreamGroup *stg = avformat_stream_group_create(s, AV_STREAM_GROUP_PARAMS_IAMF_MIX_PRESENTATION, NULL);
const AVIAMFMixPresentation *mix = mix_presentation->mix;
if (!stg)
return AVERROR(ENOMEM);
stg->id = mix_presentation->mix_presentation_id;
stg->params.iamf_mix_presentation = mix_presentation->mix;
for (int j = 0; j < mix->nb_submixes; j++) {
AVIAMFSubmix *sub_mix = mix->submixes[j];
for (int k = 0; k < sub_mix->nb_elements; k++) {
AVIAMFSubmixElement *submix_element = sub_mix->elements[k];
AVStreamGroup *audio_element = NULL;
for (int l = 0; l < s->nb_stream_groups; l++)
if (s->stream_groups[l]->type == AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT &&
s->stream_groups[l]->id == submix_element->audio_element_id) {
audio_element = s->stream_groups[l];
break;
}
av_assert0(audio_element);
for (int l = 0; l < audio_element->nb_streams; l++) {
ret = avformat_stream_group_add_stream(stg, audio_element->streams[l]);
if (ret < 0 && ret != AVERROR(EEXIST))
return ret;
}
}
}
}
return 0;
}
static int iamf_read_close(AVFormatContext *s)
{
IAMFDemuxContext *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(&c->iamf);
av_freep(&c->mix);
c->mix_size = 0;
av_freep(&c->demix);
c->demix_size = 0;
av_freep(&c->recon);
c->recon_size = 0;
return 0;
}
const AVInputFormat ff_iamf_demuxer = {
.name = "iamf",
.long_name = NULL_IF_CONFIG_SMALL("Raw Immersive Audio Model and Formats"),
.priv_data_size = sizeof(IAMFDemuxContext),
.flags_internal = FF_FMT_INIT_CLEANUP,
.read_probe = iamf_probe,
.read_header = iamf_read_header,
.read_packet = iamf_read_packet,
.read_close = iamf_read_close,
.extensions = "iamf",
.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS | AVFMT_SHOW_IDS,
};
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