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/*
* Immersive Audio Model and Formats common helpers and structs
* 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
*/
#ifndef AVFORMAT_IAMF_H
#define AVFORMAT_IAMF_H
#include <stddef.h>
#include <stdint.h>
#include "libavutil/channel_layout.h"
#include "libavutil/iamf.h"
#include "libavcodec/codec_id.h"
#include "libavcodec/codec_par.h"
#define MAX_IAMF_OBU_HEADER_SIZE (1 + 8 * 3)
// OBU types (section 3.2).
enum IAMF_OBU_Type {
IAMF_OBU_IA_CODEC_CONFIG = 0,
IAMF_OBU_IA_AUDIO_ELEMENT = 1,
IAMF_OBU_IA_MIX_PRESENTATION = 2,
IAMF_OBU_IA_PARAMETER_BLOCK = 3,
IAMF_OBU_IA_TEMPORAL_DELIMITER = 4,
IAMF_OBU_IA_AUDIO_FRAME = 5,
IAMF_OBU_IA_AUDIO_FRAME_ID0 = 6,
IAMF_OBU_IA_AUDIO_FRAME_ID1 = 7,
IAMF_OBU_IA_AUDIO_FRAME_ID2 = 8,
IAMF_OBU_IA_AUDIO_FRAME_ID3 = 9,
IAMF_OBU_IA_AUDIO_FRAME_ID4 = 10,
IAMF_OBU_IA_AUDIO_FRAME_ID5 = 11,
IAMF_OBU_IA_AUDIO_FRAME_ID6 = 12,
IAMF_OBU_IA_AUDIO_FRAME_ID7 = 13,
IAMF_OBU_IA_AUDIO_FRAME_ID8 = 14,
IAMF_OBU_IA_AUDIO_FRAME_ID9 = 15,
IAMF_OBU_IA_AUDIO_FRAME_ID10 = 16,
IAMF_OBU_IA_AUDIO_FRAME_ID11 = 17,
IAMF_OBU_IA_AUDIO_FRAME_ID12 = 18,
IAMF_OBU_IA_AUDIO_FRAME_ID13 = 19,
IAMF_OBU_IA_AUDIO_FRAME_ID14 = 20,
IAMF_OBU_IA_AUDIO_FRAME_ID15 = 21,
IAMF_OBU_IA_AUDIO_FRAME_ID16 = 22,
IAMF_OBU_IA_AUDIO_FRAME_ID17 = 23,
// 24~30 reserved.
IAMF_OBU_IA_SEQUENCE_HEADER = 31,
};
typedef struct IAMFCodecConfig {
unsigned codec_config_id;
enum AVCodecID codec_id;
uint32_t codec_tag;
unsigned nb_samples;
int seek_preroll;
int sample_rate;
int extradata_size;
uint8_t *extradata;
} IAMFCodecConfig;
typedef struct IAMFLayer {
unsigned int substream_count;
unsigned int coupled_substream_count;
} IAMFLayer;
typedef struct IAMFSubStream {
unsigned int audio_substream_id;
// demux
AVCodecParameters *codecpar;
} IAMFSubStream;
typedef struct IAMFAudioElement {
const AVIAMFAudioElement *celement;
/**
* element backs celement iff the AVIAMFAudioElement
* is owned by this structure.
*/
AVIAMFAudioElement *element;
unsigned int audio_element_id;
IAMFSubStream *substreams;
unsigned int nb_substreams;
unsigned int codec_config_id;
IAMFLayer *layers;
unsigned int nb_layers;
} IAMFAudioElement;
typedef struct IAMFMixPresentation {
const AVIAMFMixPresentation *cmix;
/**
* mix backs cmix iff the AVIAMFMixPresentation
* is owned by this structure.
*/
AVIAMFMixPresentation *mix;
unsigned int mix_presentation_id;
// demux
unsigned int count_label;
char **language_label;
} IAMFMixPresentation;
typedef struct IAMFParamDefinition {
const IAMFAudioElement *audio_element;
AVIAMFParamDefinition *param;
int mode;
size_t param_size;
} IAMFParamDefinition;
typedef struct IAMFContext {
IAMFCodecConfig **codec_configs;
int nb_codec_configs;
IAMFAudioElement **audio_elements;
int nb_audio_elements;
IAMFMixPresentation **mix_presentations;
int nb_mix_presentations;
IAMFParamDefinition **param_definitions;
int nb_param_definitions;
} IAMFContext;
enum IAMF_Anchor_Element {
IAMF_ANCHOR_ELEMENT_UNKNWONW,
IAMF_ANCHOR_ELEMENT_DIALOGUE,
IAMF_ANCHOR_ELEMENT_ALBUM,
};
enum IAMF_Sound_System {
SOUND_SYSTEM_A_0_2_0 = 0, // "Loudspeaker configuration for Sound System A"
SOUND_SYSTEM_B_0_5_0 = 1, // "Loudspeaker configuration for Sound System B"
SOUND_SYSTEM_C_2_5_0 = 2, // "Loudspeaker configuration for Sound System C"
SOUND_SYSTEM_D_4_5_0 = 3, // "Loudspeaker configuration for Sound System D"
SOUND_SYSTEM_E_4_5_1 = 4, // "Loudspeaker configuration for Sound System E"
SOUND_SYSTEM_F_3_7_0 = 5, // "Loudspeaker configuration for Sound System F"
SOUND_SYSTEM_G_4_9_0 = 6, // "Loudspeaker configuration for Sound System G"
SOUND_SYSTEM_H_9_10_3 = 7, // "Loudspeaker configuration for Sound System H"
SOUND_SYSTEM_I_0_7_0 = 8, // "Loudspeaker configuration for Sound System I"
SOUND_SYSTEM_J_4_7_0 = 9, // "Loudspeaker configuration for Sound System J"
SOUND_SYSTEM_10_2_7_0 = 10, // "Loudspeaker configuration for Sound System I" + Ltf + Rtf
SOUND_SYSTEM_11_2_3_0 = 11, // Front subset of "Loudspeaker configuration for Sound System J"
SOUND_SYSTEM_12_0_1_0 = 12, // Mono
};
struct IAMFSoundSystemMap {
enum IAMF_Sound_System id;
AVChannelLayout layout;
};
extern const AVChannelLayout ff_iamf_scalable_ch_layouts[10];
extern const struct IAMFSoundSystemMap ff_iamf_sound_system_map[13];
static inline IAMFCodecConfig *ff_iamf_get_codec_config(const IAMFContext *c,
unsigned int codec_config_id)
{
IAMFCodecConfig *codec_config = NULL;
for (int i = 0; i < c->nb_codec_configs; i++) {
if (c->codec_configs[i]->codec_config_id == codec_config_id)
codec_config = c->codec_configs[i];
}
return codec_config;
}
static inline IAMFParamDefinition *ff_iamf_get_param_definition(const IAMFContext *iamf,
unsigned int parameter_id)
{
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;
}
void ff_iamf_free_audio_element(IAMFAudioElement **paudio_element);
void ff_iamf_free_mix_presentation(IAMFMixPresentation **pmix_presentation);
void ff_iamf_uninit_context(IAMFContext *c);
#endif /* AVFORMAT_IAMF_H */
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