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ffmpeg/libavformat/iamf_reader.c

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/*
* Immersive Audio Model and Formats demuxing utils
* Copyright (c) 2024 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 "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavcodec/mathops.h"
#include "libavcodec/packet.h"
#include "avformat.h"
#include "avio_internal.h"
#include "iamf.h"
#include "iamf_parse.h"
#include "iamf_reader.h"
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, const IAMFDemuxContext *c,
AVIOContext *pb, AVPacket *pkt,
int len, enum IAMF_OBU_Type type,
unsigned skip_samples, unsigned discard_padding,
int id_in_bitstream)
{
AVStream *st;
int ret, audio_substream_id;
if (id_in_bitstream) {
unsigned explicit_audio_substream_id;
int64_t pos = avio_tell(pb);
explicit_audio_substream_id = ffio_read_leb(pb);
len -= avio_tell(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(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 int parameter_block_obu(AVFormatContext *s, IAMFDemuxContext *c,
AVIOContext *pbc, int len)
{
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(pbc, 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 = ff_iamf_get_param_definition(&c->iamf, 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->celement;
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;
}
int ff_iamf_read_packet(AVFormatContext *s, IAMFDemuxContext *c,
AVIOContext *pb, int max_size, AVPacket *pkt)
{
int read = 0;
while (1) {
uint8_t header[MAX_IAMF_OBU_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
enum IAMF_OBU_Type type;
unsigned obu_size;
unsigned skip_samples, discard_padding;
int ret, len, size, start_pos;
ret = ffio_ensure_seekback(pb, FFMIN(MAX_IAMF_OBU_HEADER_SIZE, max_size));
if (ret < 0)
return ret;
size = avio_read(pb, header, FFMIN(MAX_IAMF_OBU_HEADER_SIZE, max_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 || obu_size > max_size || len > INT_MAX - read) {
av_log(s, AV_LOG_ERROR, "Failed to read obu\n");
return len < 0 ? len : AVERROR_INVALIDDATA;
}
avio_seek(pb, -(size - start_pos), SEEK_CUR);
read += len;
if (type >= IAMF_OBU_IA_AUDIO_FRAME && type <= IAMF_OBU_IA_AUDIO_FRAME_ID17) {
ret = audio_frame_obu(s, c, pb, pkt, obu_size, type,
skip_samples, discard_padding,
type == IAMF_OBU_IA_AUDIO_FRAME);
if (ret < 0)
return ret;
return read;
} else if (type == IAMF_OBU_IA_PARAMETER_BLOCK) {
ret = parameter_block_obu(s, c, pb, 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(pb, obu_size);
if (offset < 0)
return offset;
}
max_size -= len;
if (max_size < 0)
return AVERROR_INVALIDDATA;
if (!max_size)
break;
}
return read;
}
void ff_iamf_read_deinit(IAMFDemuxContext *c)
{
IAMFContext *const iamf = &c->iamf;
ff_iamf_uninit_context(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;
}
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