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custom_decoder.c
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custom_decoder.c
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/*
Demonstrates how to implement a custom decoder.
This example implements two custom decoders:
* Vorbis via libvorbis
* Opus via libopus
A custom decoder must implement a data source. In this example, the libvorbis data source is called
`ma_libvorbis` and the Opus data source is called `ma_libopus`. These two objects are compatible
with the `ma_data_source` APIs and can be taken straight from this example and used in real code.
The custom decoding data sources (`ma_libvorbis` and `ma_libopus` in this example) are connected to
the decoder via the decoder config (`ma_decoder_config`). You need to implement a vtable for each
of your custom decoders. See `ma_decoding_backend_vtable` for the functions you need to implement.
The `onInitFile`, `onInitFileW` and `onInitMemory` functions are optional.
*/
#define MA_NO_VORBIS /* Disable the built-in Vorbis decoder to ensure the libvorbis decoder is picked. */
#define MA_NO_OPUS /* Disable the (not yet implemented) built-in Opus decoder to ensure the libopus decoder is picked. */
#define MINIAUDIO_IMPLEMENTATION
#include "../miniaudio.h"
#include "../extras/miniaudio_libvorbis.h"
#include "../extras/miniaudio_libopus.h"
#include <stdio.h>
static ma_result ma_decoding_backend_init__libvorbis(void* pUserData, ma_read_proc onRead, ma_seek_proc onSeek, ma_tell_proc onTell, void* pReadSeekTellUserData, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend)
{
ma_result result;
ma_libvorbis* pVorbis;
(void)pUserData;
pVorbis = (ma_libvorbis*)ma_malloc(sizeof(*pVorbis), pAllocationCallbacks);
if (pVorbis == NULL) {
return MA_OUT_OF_MEMORY;
}
result = ma_libvorbis_init(onRead, onSeek, onTell, pReadSeekTellUserData, pConfig, pAllocationCallbacks, pVorbis);
if (result != MA_SUCCESS) {
ma_free(pVorbis, pAllocationCallbacks);
return result;
}
*ppBackend = pVorbis;
return MA_SUCCESS;
}
static ma_result ma_decoding_backend_init_file__libvorbis(void* pUserData, const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend)
{
ma_result result;
ma_libvorbis* pVorbis;
(void)pUserData;
pVorbis = (ma_libvorbis*)ma_malloc(sizeof(*pVorbis), pAllocationCallbacks);
if (pVorbis == NULL) {
return MA_OUT_OF_MEMORY;
}
result = ma_libvorbis_init_file(pFilePath, pConfig, pAllocationCallbacks, pVorbis);
if (result != MA_SUCCESS) {
ma_free(pVorbis, pAllocationCallbacks);
return result;
}
*ppBackend = pVorbis;
return MA_SUCCESS;
}
static void ma_decoding_backend_uninit__libvorbis(void* pUserData, ma_data_source* pBackend, const ma_allocation_callbacks* pAllocationCallbacks)
{
ma_libvorbis* pVorbis = (ma_libvorbis*)pBackend;
(void)pUserData;
ma_libvorbis_uninit(pVorbis, pAllocationCallbacks);
ma_free(pVorbis, pAllocationCallbacks);
}
static ma_result ma_decoding_backend_get_channel_map__libvorbis(void* pUserData, ma_data_source* pBackend, ma_channel* pChannelMap, size_t channelMapCap)
{
ma_libvorbis* pVorbis = (ma_libvorbis*)pBackend;
(void)pUserData;
return ma_libvorbis_get_data_format(pVorbis, NULL, NULL, NULL, pChannelMap, channelMapCap);
}
static ma_decoding_backend_vtable g_ma_decoding_backend_vtable_libvorbis =
{
ma_decoding_backend_init__libvorbis,
ma_decoding_backend_init_file__libvorbis,
NULL, /* onInitFileW() */
NULL, /* onInitMemory() */
ma_decoding_backend_uninit__libvorbis
};
static ma_result ma_decoding_backend_init__libopus(void* pUserData, ma_read_proc onRead, ma_seek_proc onSeek, ma_tell_proc onTell, void* pReadSeekTellUserData, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend)
{
ma_result result;
ma_libopus* pOpus;
(void)pUserData;
pOpus = (ma_libopus*)ma_malloc(sizeof(*pOpus), pAllocationCallbacks);
if (pOpus == NULL) {
return MA_OUT_OF_MEMORY;
}
result = ma_libopus_init(onRead, onSeek, onTell, pReadSeekTellUserData, pConfig, pAllocationCallbacks, pOpus);
if (result != MA_SUCCESS) {
ma_free(pOpus, pAllocationCallbacks);
return result;
}
*ppBackend = pOpus;
return MA_SUCCESS;
}
static ma_result ma_decoding_backend_init_file__libopus(void* pUserData, const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend)
{
ma_result result;
ma_libopus* pOpus;
(void)pUserData;
pOpus = (ma_libopus*)ma_malloc(sizeof(*pOpus), pAllocationCallbacks);
if (pOpus == NULL) {
return MA_OUT_OF_MEMORY;
}
result = ma_libopus_init_file(pFilePath, pConfig, pAllocationCallbacks, pOpus);
if (result != MA_SUCCESS) {
ma_free(pOpus, pAllocationCallbacks);
return result;
}
*ppBackend = pOpus;
return MA_SUCCESS;
}
static void ma_decoding_backend_uninit__libopus(void* pUserData, ma_data_source* pBackend, const ma_allocation_callbacks* pAllocationCallbacks)
{
ma_libopus* pOpus = (ma_libopus*)pBackend;
(void)pUserData;
ma_libopus_uninit(pOpus, pAllocationCallbacks);
ma_free(pOpus, pAllocationCallbacks);
}
static ma_result ma_decoding_backend_get_channel_map__libopus(void* pUserData, ma_data_source* pBackend, ma_channel* pChannelMap, size_t channelMapCap)
{
ma_libopus* pOpus = (ma_libopus*)pBackend;
(void)pUserData;
return ma_libopus_get_data_format(pOpus, NULL, NULL, NULL, pChannelMap, channelMapCap);
}
static ma_decoding_backend_vtable g_ma_decoding_backend_vtable_libopus =
{
ma_decoding_backend_init__libopus,
ma_decoding_backend_init_file__libopus,
NULL, /* onInitFileW() */
NULL, /* onInitMemory() */
ma_decoding_backend_uninit__libopus
};
void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
{
ma_data_source* pDataSource = (ma_data_source*)pDevice->pUserData;
if (pDataSource == NULL) {
return;
}
ma_data_source_read_pcm_frames(pDataSource, pOutput, frameCount, NULL);
(void)pInput;
}
int main(int argc, char** argv)
{
ma_result result;
ma_decoder_config decoderConfig;
ma_decoder decoder;
ma_device_config deviceConfig;
ma_device device;
ma_format format;
ma_uint32 channels;
ma_uint32 sampleRate;
/*
Add your custom backend vtables here. The order in the array defines the order of priority. The
vtables will be passed in via the decoder config.
*/
ma_decoding_backend_vtable* pCustomBackendVTables[] =
{
&g_ma_decoding_backend_vtable_libvorbis,
&g_ma_decoding_backend_vtable_libopus
};
if (argc < 2) {
printf("No input file.\n");
return -1;
}
/* Initialize the decoder. */
decoderConfig = ma_decoder_config_init_default();
decoderConfig.pCustomBackendUserData = NULL; /* In this example our backend objects are contained within a ma_decoder_ex object to avoid a malloc. Our vtables need to know about this. */
decoderConfig.ppCustomBackendVTables = pCustomBackendVTables;
decoderConfig.customBackendCount = sizeof(pCustomBackendVTables) / sizeof(pCustomBackendVTables[0]);
result = ma_decoder_init_file(argv[1], &decoderConfig, &decoder);
if (result != MA_SUCCESS) {
printf("Failed to initialize decoder.");
return -1;
}
ma_data_source_set_looping(&decoder, MA_TRUE);
/* Initialize the device. */
result = ma_data_source_get_data_format(&decoder, &format, &channels, &sampleRate, NULL, 0);
if (result != MA_SUCCESS) {
printf("Failed to retrieve decoder data format.");
ma_decoder_uninit(&decoder);
return -1;
}
deviceConfig = ma_device_config_init(ma_device_type_playback);
deviceConfig.playback.format = format;
deviceConfig.playback.channels = channels;
deviceConfig.sampleRate = sampleRate;
deviceConfig.dataCallback = data_callback;
deviceConfig.pUserData = &decoder;
if (ma_device_init(NULL, &deviceConfig, &device) != MA_SUCCESS) {
printf("Failed to open playback device.\n");
ma_decoder_uninit(&decoder);
return -1;
}
if (ma_device_start(&device) != MA_SUCCESS) {
printf("Failed to start playback device.\n");
ma_device_uninit(&device);
ma_decoder_uninit(&decoder);
return -1;
}
printf("Press Enter to quit...");
getchar();
ma_device_uninit(&device);
ma_decoder_uninit(&decoder);
return 0;
}