avutil: introduce an Immersive Audio Model and Formats API

Signed-off-by: James Almer <jamrial@gmail.com>

1 files changed, 563 insertions, 0 deletions

diff --git a/libavutil/iamf.c b/libavutil/iamf.c
new file mode 100644
index 0000000000..62b6051049
--- /dev/null
+++ b/libavutil/iamf.c
@@ -0,0 +1,563 @@
+/*
+ * Immersive Audio Model and Formats helper functions and defines
+ *
+ * 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 <limits.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "avassert.h"
+#include "error.h"
+#include "iamf.h"
+#include "log.h"
+#include "mem.h"
+#include "opt.h"
+
+#define IAMF_ADD_FUNC_TEMPLATE(parent_type, parent_name, child_type, child_name, suffix)                   \
+child_type *av_iamf_ ## parent_name ## _add_ ## child_name(parent_type *parent_name)                       \
+{                                                                                                          \
+    child_type **child_name ## suffix, *child_name;                                                        \
+                                                                                                           \
+    if (parent_name->nb_## child_name ## suffix == UINT_MAX)                                               \
+        return NULL;                                                                                       \
+                                                                                                           \
+    child_name ## suffix = av_realloc_array(parent_name->child_name ## suffix,                             \
+                                            parent_name->nb_## child_name ## suffix + 1,                   \
+                                            sizeof(*parent_name->child_name ## suffix));                   \
+    if (!child_name ## suffix)                                                                             \
+        return NULL;                                                                                       \
+                                                                                                           \
+    parent_name->child_name ## suffix = child_name ## suffix;                                              \
+                                                                                                           \
+    child_name = parent_name->child_name ## suffix[parent_name->nb_## child_name ## suffix]                \
+               = av_mallocz(sizeof(*child_name));                                                          \
+    if (!child_name)                                                                                       \
+        return NULL;                                                                                       \
+                                                                                                           \
+    child_name->av_class = &child_name ## _class;                                                          \
+    av_opt_set_defaults(child_name);                                                                       \
+    parent_name->nb_## child_name ## suffix++;                                                             \
+                                                                                                           \
+    return child_name;                                                                                     \
+}
+
+#define FLAGS AV_OPT_FLAG_ENCODING_PARAM
+
+//
+// Param Definition
+//
+#define OFFSET(x) offsetof(AVIAMFMixGain, x)
+static const AVOption mix_gain_options[] = {
+    { "subblock_duration", "set subblock_duration", OFFSET(subblock_duration), AV_OPT_TYPE_INT64, {.i64 = 1 }, 1, UINT_MAX, FLAGS },
+    { "animation_type", "set animation_type", OFFSET(animation_type), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, FLAGS },
+    { "start_point_value", "set start_point_value", OFFSET(animation_type), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "end_point_value", "set end_point_value", OFFSET(animation_type), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "control_point_value", "set control_point_value", OFFSET(animation_type), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "control_point_relative_time", "set control_point_relative_time", OFFSET(animation_type), AV_OPT_TYPE_RATIONAL, {.dbl = 0 }, 0.0, 1.0, FLAGS },
+    { NULL },
+};
+
+static const AVClass mix_gain_class = {
+    .class_name     = "AVIAMFSubmixElement",
+    .item_name      = av_default_item_name,
+    .version        = LIBAVUTIL_VERSION_INT,
+    .option         = mix_gain_options,
+};
+
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFDemixingInfo, x)
+static const AVOption demixing_info_options[] = {
+    { "subblock_duration", "set subblock_duration", OFFSET(subblock_duration), AV_OPT_TYPE_INT64, {.i64 = 1 }, 1, UINT_MAX, FLAGS },
+    { "dmixp_mode", "set dmixp_mode", OFFSET(dmixp_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 6, FLAGS },
+    { NULL },
+};
+
+static const AVClass demixing_info_class = {
+    .class_name     = "AVIAMFDemixingInfo",
+    .item_name      = av_default_item_name,
+    .version        = LIBAVUTIL_VERSION_INT,
+    .option         = demixing_info_options,
+};
+
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFReconGain, x)
+static const AVOption recon_gain_options[] = {
+    { "subblock_duration", "set subblock_duration", OFFSET(subblock_duration), AV_OPT_TYPE_INT64, {.i64 = 1 }, 1, UINT_MAX, FLAGS },
+    { NULL },
+};
+
+static const AVClass recon_gain_class = {
+    .class_name     = "AVIAMFReconGain",
+    .item_name      = av_default_item_name,
+    .version        = LIBAVUTIL_VERSION_INT,
+    .option         = recon_gain_options,
+};
+
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFParamDefinition, x)
+static const AVOption param_definition_options[] = {
+    { "parameter_id", "set parameter_id", OFFSET(parameter_id), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, UINT_MAX, FLAGS },
+    { "parameter_rate", "set parameter_rate", OFFSET(parameter_rate), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, UINT_MAX, FLAGS },
+    { "duration", "set duration", OFFSET(duration), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, UINT_MAX, FLAGS },
+    { "constant_subblock_duration", "set constant_subblock_duration", OFFSET(constant_subblock_duration), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, UINT_MAX, FLAGS },
+    { NULL },
+};
+
+static const AVClass *param_definition_child_iterate(void **opaque)
+{
+    uintptr_t i = (uintptr_t)*opaque;
+    const AVClass *ret = NULL;
+
+    switch(i) {
+    case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN:
+        ret = &mix_gain_class;
+        break;
+    case AV_IAMF_PARAMETER_DEFINITION_DEMIXING:
+        ret = &demixing_info_class;
+        break;
+    case AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN:
+        ret = &recon_gain_class;
+        break;
+    default:
+        break;
+    }
+
+    if (ret)
+        *opaque = (void*)(i + 1);
+    return ret;
+}
+
+static const AVClass param_definition_class = {
+    .class_name          = "AVIAMFParamDefinition",
+    .item_name           = av_default_item_name,
+    .version             = LIBAVUTIL_VERSION_INT,
+    .option              = param_definition_options,
+    .child_class_iterate = param_definition_child_iterate,
+};
+
+const AVClass *av_iamf_param_definition_get_class(void)
+{
+    return &param_definition_class;
+}
+
+AVIAMFParamDefinition *av_iamf_param_definition_alloc(enum AVIAMFParamDefinitionType type,
+                                                      unsigned int nb_subblocks, size_t *out_size)
+{
+
+    struct MixGainStruct {
+        AVIAMFParamDefinition p;
+        AVIAMFMixGain m;
+    };
+    struct DemixStruct {
+        AVIAMFParamDefinition p;
+        AVIAMFDemixingInfo d;
+    };
+    struct ReconGainStruct {
+        AVIAMFParamDefinition p;
+        AVIAMFReconGain r;
+    };
+    size_t subblocks_offset, subblock_size;
+    size_t size;
+    AVIAMFParamDefinition *par;
+
+    switch (type) {
+    case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN:
+        subblocks_offset = offsetof(struct MixGainStruct, m);
+        subblock_size = sizeof(AVIAMFMixGain);
+        break;
+    case AV_IAMF_PARAMETER_DEFINITION_DEMIXING:
+        subblocks_offset = offsetof(struct DemixStruct, d);
+        subblock_size = sizeof(AVIAMFDemixingInfo);
+        break;
+    case AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN:
+        subblocks_offset = offsetof(struct ReconGainStruct, r);
+        subblock_size = sizeof(AVIAMFReconGain);
+        break;
+    default:
+        return NULL;
+    }
+
+    size = subblocks_offset;
+    if (nb_subblocks > (SIZE_MAX - size) / subblock_size)
+        return NULL;
+    size += subblock_size * nb_subblocks;
+
+    par = av_mallocz(size);
+    if (!par)
+        return NULL;
+
+    par->av_class = &param_definition_class;
+    av_opt_set_defaults(par);
+
+    par->type = type;
+    par->nb_subblocks = nb_subblocks;
+    par->subblock_size = subblock_size;
+    par->subblocks_offset = subblocks_offset;
+
+    for (int i = 0; i < nb_subblocks; i++) {
+        void *subblock = av_iamf_param_definition_get_subblock(par, i);
+
+        switch (type) {
+        case AV_IAMF_PARAMETER_DEFINITION_MIX_GAIN:
+            ((AVIAMFMixGain *)subblock)->av_class = &mix_gain_class;
+            break;
+        case AV_IAMF_PARAMETER_DEFINITION_DEMIXING:
+            ((AVIAMFDemixingInfo *)subblock)->av_class = &demixing_info_class;
+            break;
+        case AV_IAMF_PARAMETER_DEFINITION_RECON_GAIN:
+            ((AVIAMFReconGain *)subblock)->av_class = &recon_gain_class;
+            break;
+        default:
+            av_assert0(0);
+        }
+
+        av_opt_set_defaults(subblock);
+    }
+
+    if (out_size)
+        *out_size = size;
+
+    return par;
+}
+
+//
+// Audio Element
+//
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFLayer, x)
+static const AVOption layer_options[] = {
+    { "ch_layout", "set ch_layout", OFFSET(ch_layout), AV_OPT_TYPE_CHLAYOUT, {.str = NULL }, 0, 0, FLAGS },
+    { "flags", "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS,
+        {.i64 = 0 }, 0, AV_IAMF_LAYER_FLAG_RECON_GAIN, FLAGS, "flags" },
+            {"recon_gain",  "Recon gain is present", 0, AV_OPT_TYPE_CONST,
+                {.i64 = AV_IAMF_LAYER_FLAG_RECON_GAIN }, INT_MIN, INT_MAX, FLAGS, "flags"},
+    { "output_gain_flags", "set output_gain_flags", OFFSET(output_gain_flags), AV_OPT_TYPE_FLAGS,
+        {.i64 = 0 }, 0, (1 << 6) - 1, FLAGS, "output_gain_flags" },
+            {"FL",  "Left channel",            0, AV_OPT_TYPE_CONST,
+                {.i64 = 1 << 5 }, INT_MIN, INT_MAX, FLAGS, "output_gain_flags"},
+            {"FR",  "Right channel",           0, AV_OPT_TYPE_CONST,
+                {.i64 = 1 << 4 }, INT_MIN, INT_MAX, FLAGS, "output_gain_flags"},
+            {"BL",  "Left surround channel",   0, AV_OPT_TYPE_CONST,
+                {.i64 = 1 << 3 }, INT_MIN, INT_MAX, FLAGS, "output_gain_flags"},
+            {"BR",  "Right surround channel",  0, AV_OPT_TYPE_CONST,
+                {.i64 = 1 << 2 }, INT_MIN, INT_MAX, FLAGS, "output_gain_flags"},
+            {"TFL", "Left top front channel",  0, AV_OPT_TYPE_CONST,
+                {.i64 = 1 << 1 }, INT_MIN, INT_MAX, FLAGS, "output_gain_flags"},
+            {"TFR", "Right top front channel", 0, AV_OPT_TYPE_CONST,
+                {.i64 = 1 << 0 }, INT_MIN, INT_MAX, FLAGS, "output_gain_flags"},
+    { "output_gain", "set output_gain", OFFSET(output_gain), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "ambisonics_mode", "set ambisonics_mode", OFFSET(ambisonics_mode), AV_OPT_TYPE_INT,
+            { .i64 = AV_IAMF_AMBISONICS_MODE_MONO },
+            AV_IAMF_AMBISONICS_MODE_MONO, AV_IAMF_AMBISONICS_MODE_PROJECTION, FLAGS, "ambisonics_mode" },
+        { "mono",       NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_AMBISONICS_MODE_MONO },       .unit = "ambisonics_mode" },
+        { "projection", NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_AMBISONICS_MODE_PROJECTION }, .unit = "ambisonics_mode" },
+    { NULL },
+};
+
+static const AVClass layer_class = {
+    .class_name     = "AVIAMFLayer",
+    .item_name      = av_default_item_name,
+    .version        = LIBAVUTIL_VERSION_INT,
+    .option         = layer_options,
+};
+
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFAudioElement, x)
+static const AVOption audio_element_options[] = {
+    { "audio_element_type", "set audio_element_type", OFFSET(audio_element_type), AV_OPT_TYPE_INT,
+            {.i64 = AV_IAMF_AUDIO_ELEMENT_TYPE_CHANNEL },
+            AV_IAMF_AUDIO_ELEMENT_TYPE_CHANNEL, AV_IAMF_AUDIO_ELEMENT_TYPE_SCENE, FLAGS, "audio_element_type" },
+        { "channel", NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_AUDIO_ELEMENT_TYPE_CHANNEL }, .unit = "audio_element_type" },
+        { "scene",   NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_AUDIO_ELEMENT_TYPE_SCENE },   .unit = "audio_element_type" },
+    { "default_w", "set default_w", OFFSET(default_w), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 10, FLAGS },
+    { NULL },
+};
+
+static const AVClass *audio_element_child_iterate(void **opaque)
+{
+    uintptr_t i = (uintptr_t)*opaque;
+    const AVClass *ret = NULL;
+
+    if (i)
+        ret = &layer_class;
+
+    if (ret)
+        *opaque = (void*)(i + 1);
+    return ret;
+}
+
+static const AVClass audio_element_class = {
+    .class_name          = "AVIAMFAudioElement",
+    .item_name           = av_default_item_name,
+    .version             = LIBAVUTIL_VERSION_INT,
+    .option              = audio_element_options,
+    .child_class_iterate = audio_element_child_iterate,
+};
+
+const AVClass *av_iamf_audio_element_get_class(void)
+{
+    return &audio_element_class;
+}
+
+AVIAMFAudioElement *av_iamf_audio_element_alloc(void)
+{
+    AVIAMFAudioElement *audio_element = av_mallocz(sizeof(*audio_element));
+
+    if (audio_element) {
+        audio_element->av_class = &audio_element_class;
+        av_opt_set_defaults(audio_element);
+    }
+
+    return audio_element;
+}
+
+IAMF_ADD_FUNC_TEMPLATE(AVIAMFAudioElement, audio_element, AVIAMFLayer, layer, s)
+
+void av_iamf_audio_element_free(AVIAMFAudioElement **paudio_element)
+{
+    AVIAMFAudioElement *audio_element = *paudio_element;
+
+    if (!audio_element)
+        return;
+
+    for (int i = 0; i < audio_element->nb_layers; i++) {
+        AVIAMFLayer *layer = audio_element->layers[i];
+        av_opt_free(layer);
+        av_free(layer->demixing_matrix);
+        av_free(layer);
+    }
+    av_free(audio_element->layers);
+
+    av_free(audio_element->demixing_info);
+    av_free(audio_element->recon_gain_info);
+    av_freep(paudio_element);
+}
+
+//
+// Mix Presentation
+//
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFSubmixElement, x)
+static const AVOption submix_element_options[] = {
+    { "headphones_rendering_mode", "Headphones rendering mode", OFFSET(headphones_rendering_mode), AV_OPT_TYPE_INT,
+            { .i64 = AV_IAMF_HEADPHONES_MODE_STEREO },
+            AV_IAMF_HEADPHONES_MODE_STEREO, AV_IAMF_HEADPHONES_MODE_BINAURAL, FLAGS, "headphones_rendering_mode" },
+        { "stereo",   NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_HEADPHONES_MODE_STEREO },   .unit = "headphones_rendering_mode" },
+        { "binaural", NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_HEADPHONES_MODE_BINAURAL }, .unit = "headphones_rendering_mode" },
+    { "default_mix_gain", "Default mix gain", OFFSET(default_mix_gain), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "annotations", "Annotations", OFFSET(annotations), AV_OPT_TYPE_DICT, { .str = NULL }, 0, 0, FLAGS },
+    { NULL },
+};
+
+static void *submix_element_child_next(void *obj, void *prev)
+{
+    AVIAMFSubmixElement *submix_element = obj;
+    if (!prev)
+        return submix_element->element_mix_config;
+
+    return NULL;
+}
+
+static const AVClass *submix_element_child_iterate(void **opaque)
+{
+    uintptr_t i = (uintptr_t)*opaque;
+    const AVClass *ret = NULL;
+
+    if (i)
+        ret = &param_definition_class;
+
+    if (ret)
+        *opaque = (void*)(i + 1);
+    return ret;
+}
+
+static const AVClass element_class = {
+    .class_name          = "AVIAMFSubmixElement",
+    .item_name           = av_default_item_name,
+    .version             = LIBAVUTIL_VERSION_INT,
+    .option              = submix_element_options,
+    .child_next          = submix_element_child_next,
+    .child_class_iterate = submix_element_child_iterate,
+};
+
+IAMF_ADD_FUNC_TEMPLATE(AVIAMFSubmix, submix, AVIAMFSubmixElement, element, s)
+
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFSubmixLayout, x)
+static const AVOption submix_layout_options[] = {
+    { "layout_type", "Layout type", OFFSET(layout_type), AV_OPT_TYPE_INT,
+            { .i64 = AV_IAMF_SUBMIX_LAYOUT_TYPE_LOUDSPEAKERS },
+            AV_IAMF_SUBMIX_LAYOUT_TYPE_LOUDSPEAKERS, AV_IAMF_SUBMIX_LAYOUT_TYPE_BINAURAL, FLAGS, "layout_type" },
+        { "loudspeakers", NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_SUBMIX_LAYOUT_TYPE_LOUDSPEAKERS }, .unit = "layout_type" },
+        { "binaural",     NULL, 0, AV_OPT_TYPE_CONST,
+                   { .i64 = AV_IAMF_SUBMIX_LAYOUT_TYPE_BINAURAL },     .unit = "layout_type" },
+    { "sound_system", "Sound System", OFFSET(sound_system), AV_OPT_TYPE_CHLAYOUT, { .str = NULL }, 0, 0, FLAGS },
+    { "integrated_loudness", "Integrated loudness", OFFSET(integrated_loudness), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "digital_peak", "Digital peak", OFFSET(digital_peak), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "true_peak", "True peak", OFFSET(true_peak), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "dialog_anchored_loudness", "Anchored loudness (Dialog)", OFFSET(dialogue_anchored_loudness), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { "album_anchored_loudness", "Anchored loudness (Album)", OFFSET(album_anchored_loudness), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { NULL },
+};
+
+static const AVClass layout_class = {
+    .class_name     = "AVIAMFSubmixLayout",
+    .item_name      = av_default_item_name,
+    .version        = LIBAVUTIL_VERSION_INT,
+    .option         = submix_layout_options,
+};
+
+IAMF_ADD_FUNC_TEMPLATE(AVIAMFSubmix, submix, AVIAMFSubmixLayout, layout, s)
+
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFSubmix, x)
+static const AVOption submix_presentation_options[] = {
+    { "default_mix_gain", "Default mix gain", OFFSET(default_mix_gain), AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, -128.0, 128.0, FLAGS },
+    { NULL },
+};
+
+static void *submix_presentation_child_next(void *obj, void *prev)
+{
+    AVIAMFSubmix *sub_mix = obj;
+    if (!prev)
+        return sub_mix->output_mix_config;
+
+    return NULL;
+}
+
+static const AVClass *submix_presentation_child_iterate(void **opaque)
+{
+    uintptr_t i = (uintptr_t)*opaque;
+    const AVClass *ret = NULL;
+
+    switch(i) {
+    case 0:
+        ret = &element_class;
+        break;
+    case 1:
+        ret = &layout_class;
+        break;
+    case 2:
+        ret = &param_definition_class;
+        break;
+    default:
+        break;
+    }
+
+    if (ret)
+        *opaque = (void*)(i + 1);
+    return ret;
+}
+
+static const AVClass submix_class = {
+    .class_name          = "AVIAMFSubmix",
+    .item_name           = av_default_item_name,
+    .version             = LIBAVUTIL_VERSION_INT,
+    .option              = submix_presentation_options,
+    .child_next          = submix_presentation_child_next,
+    .child_class_iterate = submix_presentation_child_iterate,
+};
+
+#undef OFFSET
+#define OFFSET(x) offsetof(AVIAMFMixPresentation, x)
+static const AVOption mix_presentation_options[] = {
+    { "annotations", "set annotations", OFFSET(annotations), AV_OPT_TYPE_DICT, {.str = NULL }, 0, 0, FLAGS },
+    { NULL },
+};
+
+#undef OFFSET
+#undef FLAGS
+
+static const AVClass *mix_presentation_child_iterate(void **opaque)
+{
+    uintptr_t i = (uintptr_t)*opaque;
+    const AVClass *ret = NULL;
+
+    if (i)
+        ret = &submix_class;
+
+    if (ret)
+        *opaque = (void*)(i + 1);
+    return ret;
+}
+
+static const AVClass mix_presentation_class = {
+    .class_name          = "AVIAMFMixPresentation",
+    .item_name           = av_default_item_name,
+    .version             = LIBAVUTIL_VERSION_INT,
+    .option              = mix_presentation_options,
+    .child_class_iterate = mix_presentation_child_iterate,
+};
+
+const AVClass *av_iamf_mix_presentation_get_class(void)
+{
+    return &mix_presentation_class;
+}
+
+AVIAMFMixPresentation *av_iamf_mix_presentation_alloc(void)
+{
+    AVIAMFMixPresentation *mix_presentation = av_mallocz(sizeof(*mix_presentation));
+
+    if (mix_presentation) {
+        mix_presentation->av_class = &mix_presentation_class;
+        av_opt_set_defaults(mix_presentation);
+    }
+
+    return mix_presentation;
+}
+
+IAMF_ADD_FUNC_TEMPLATE(AVIAMFMixPresentation, mix_presentation, AVIAMFSubmix, submix, es)
+
+void av_iamf_mix_presentation_free(AVIAMFMixPresentation **pmix_presentation)
+{
+    AVIAMFMixPresentation *mix_presentation = *pmix_presentation;
+
+    if (!mix_presentation)
+        return;
+
+    for (int i = 0; i < mix_presentation->nb_submixes; i++) {
+        AVIAMFSubmix *sub_mix = mix_presentation->submixes[i];
+        for (int j = 0; j < sub_mix->nb_elements; j++) {
+            AVIAMFSubmixElement *submix_element = sub_mix->elements[j];
+            av_opt_free(submix_element);
+            av_free(submix_element->element_mix_config);
+            av_free(submix_element);
+        }
+        av_free(sub_mix->elements);
+        for (int j = 0; j < sub_mix->nb_layouts; j++) {
+            AVIAMFSubmixLayout *submix_layout = sub_mix->layouts[j];
+            av_opt_free(submix_layout);
+            av_free(submix_layout);
+        }
+        av_free(sub_mix->layouts);
+        av_free(sub_mix->output_mix_config);
+        av_free(sub_mix);
+    }
+    av_opt_free(mix_presentation);
+    av_free(mix_presentation->submixes);
+
+    av_freep(pmix_presentation);
+}