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miniaudio/examples/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 <stdio.h>
#if !defined(MA_NO_LIBVORBIS)
#define OV_EXCLUDE_STATIC_CALLBACKS
#include <vorbis/vorbisfile.h>
#endif
typedef struct
{
ma_data_source_base ds; /* The libvorbis decoder can be used independently as a data source. */
ma_read_proc onRead;
ma_seek_proc onSeek;
ma_tell_proc onTell;
void* pReadSeekTellUserData;
ma_format format; /* Will be either f32 or s16. */
#if !defined(MA_NO_LIBVORBIS)
OggVorbis_File vf;
#endif
} ma_libvorbis;
MA_API ma_result ma_libvorbis_init(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_libvorbis* pVorbis);
MA_API ma_result ma_libvorbis_init_file(const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_libvorbis* pVorbis);
MA_API void ma_libvorbis_uninit(ma_libvorbis* pVorbis, const ma_allocation_callbacks* pAllocationCallbacks);
MA_API ma_result ma_libvorbis_read_pcm_frames(ma_libvorbis* pVorbis, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead);
MA_API ma_result ma_libvorbis_seek_to_pcm_frame(ma_libvorbis* pVorbis, ma_uint64 frameIndex);
MA_API ma_result ma_libvorbis_get_data_format(ma_libvorbis* pVorbis, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap);
MA_API ma_result ma_libvorbis_get_cursor_in_pcm_frames(ma_libvorbis* pVorbis, ma_uint64* pCursor);
MA_API ma_result ma_libvorbis_get_length_in_pcm_frames(ma_libvorbis* pVorbis, ma_uint64* pLength);
static ma_result ma_libvorbis_ds_read(ma_data_source* pDataSource, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
return ma_libvorbis_read_pcm_frames((ma_libvorbis*)pDataSource, pFramesOut, frameCount, pFramesRead);
}
static ma_result ma_libvorbis_ds_seek(ma_data_source* pDataSource, ma_uint64 frameIndex)
{
return ma_libvorbis_seek_to_pcm_frame((ma_libvorbis*)pDataSource, frameIndex);
}
static ma_result ma_libvorbis_ds_get_data_format(ma_data_source* pDataSource, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
return ma_libvorbis_get_data_format((ma_libvorbis*)pDataSource, pFormat, pChannels, pSampleRate, NULL, 0);
}
static ma_result ma_libvorbis_ds_get_cursor(ma_data_source* pDataSource, ma_uint64* pCursor)
{
return ma_libvorbis_get_cursor_in_pcm_frames((ma_libvorbis*)pDataSource, pCursor);
}
static ma_result ma_libvorbis_ds_get_length(ma_data_source* pDataSource, ma_uint64* pLength)
{
return ma_libvorbis_get_length_in_pcm_frames((ma_libvorbis*)pDataSource, pLength);
}
static ma_data_source_vtable g_ma_libvorbis_ds_vtable =
{
ma_libvorbis_ds_read,
ma_libvorbis_ds_seek,
NULL, /* onMap() */
NULL, /* onUnmap() */
ma_libvorbis_ds_get_data_format,
ma_libvorbis_ds_get_cursor,
ma_libvorbis_ds_get_length
};
#if !defined(MA_NO_LIBVORBIS)
static size_t ma_libvorbis_vf_callback__read(void* pBufferOut, size_t size, size_t count, void* pUserData)
{
ma_libvorbis* pVorbis = (ma_libvorbis*)pUserData;
ma_result result;
size_t bytesToRead;
size_t bytesRead;
bytesToRead = size * count;
result = pVorbis->onRead(pVorbis->pReadSeekTellUserData, pBufferOut, bytesToRead, &bytesRead);
return bytesRead / size;
}
static int ma_libvorbis_vf_callback__seek(void* pUserData, ogg_int64_t offset, int whence)
{
ma_libvorbis* pVorbis = (ma_libvorbis*)pUserData;
ma_result result;
ma_seek_origin origin;
if (whence == SEEK_SET) {
origin = ma_seek_origin_start;
} else if (whence == SEEK_END) {
origin = ma_seek_origin_end;
} else {
origin = ma_seek_origin_current;
}
result = pVorbis->onSeek(pVorbis->pReadSeekTellUserData, offset, origin);
if (result != MA_SUCCESS) {
return -1;
}
return 0;
}
static long ma_libvorbis_vf_callback__tell(void* pUserData)
{
ma_libvorbis* pVorbis = (ma_libvorbis*)pUserData;
ma_result result;
ma_int64 cursor;
result = pVorbis->onTell(pVorbis->pReadSeekTellUserData, &cursor);
if (result != MA_SUCCESS) {
return -1;
}
return (long)cursor;
}
#endif
static ma_result ma_libvorbis_init_internal(const ma_decoding_backend_config* pConfig, ma_libvorbis* pVorbis)
{
ma_result result;
ma_data_source_config dataSourceConfig;
if (pVorbis == NULL) {
return MA_INVALID_ARGS;
}
MA_ZERO_OBJECT(pVorbis);
pVorbis->format = ma_format_f32; /* f32 by default. */
if (pConfig != NULL && (pConfig->preferredFormat == ma_format_f32 || pConfig->preferredFormat == ma_format_s16)) {
pVorbis->format = pConfig->preferredFormat;
} else {
/* Getting here means something other than f32 and s16 was specified. Just leave this unset to use the default format. */
}
dataSourceConfig = ma_data_source_config_init();
dataSourceConfig.vtable = &g_ma_libvorbis_ds_vtable;
result = ma_data_source_init(&dataSourceConfig, &pVorbis->ds);
if (result != MA_SUCCESS) {
return result; /* Failed to initialize the base data source. */
}
return MA_SUCCESS;
}
MA_API ma_result ma_libvorbis_init(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_libvorbis* pVorbis)
{
ma_result result;
(void)pAllocationCallbacks; /* Can't seem to find a way to configure memory allocations in libvorbis. */
result = ma_libvorbis_init_internal(pConfig, pVorbis);
if (result != MA_SUCCESS) {
return result;
}
if (onRead == NULL || onSeek == NULL) {
return MA_INVALID_ARGS; /* onRead and onSeek are mandatory. */
}
pVorbis->onRead = onRead;
pVorbis->onSeek = onSeek;
pVorbis->onTell = onTell;
pVorbis->pReadSeekTellUserData = pReadSeekTellUserData;
#if !defined(MA_NO_LIBVORBIS)
{
int libvorbisResult;
ov_callbacks libvorbisCallbacks;
/* We can now initialize the vorbis decoder. This must be done after we've set up the callbacks. */
libvorbisCallbacks.read_func = ma_libvorbis_vf_callback__read;
libvorbisCallbacks.seek_func = ma_libvorbis_vf_callback__seek;
libvorbisCallbacks.close_func = NULL;
libvorbisCallbacks.tell_func = ma_libvorbis_vf_callback__tell;
libvorbisResult = ov_open_callbacks(pVorbis, &pVorbis->vf, NULL, 0, libvorbisCallbacks);
if (libvorbisResult < 0) {
return MA_INVALID_FILE;
}
return MA_SUCCESS;
}
#else
{
/* libvorbis is disabled. */
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libvorbis_init_file(const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_libvorbis* pVorbis)
{
ma_result result;
(void)pAllocationCallbacks; /* Can't seem to find a way to configure memory allocations in libvorbis. */
result = ma_libvorbis_init_internal(pConfig, pVorbis);
if (result != MA_SUCCESS) {
return result;
}
#if !defined(MA_NO_LIBVORBIS)
{
int libvorbisResult;
libvorbisResult = ov_fopen(pFilePath, &pVorbis->vf);
if (libvorbisResult < 0) {
return MA_INVALID_FILE;
}
return MA_SUCCESS;
}
#else
{
/* libvorbis is disabled. */
(void)pFilePath;
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API void ma_libvorbis_uninit(ma_libvorbis* pVorbis, const ma_allocation_callbacks* pAllocationCallbacks)
{
if (pVorbis == NULL) {
return;
}
(void)pAllocationCallbacks;
#if !defined(MA_NO_LIBVORBIS)
{
ov_clear(&pVorbis->vf);
}
#else
{
/* libvorbis is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
}
#endif
ma_data_source_uninit(&pVorbis->ds);
}
MA_API ma_result ma_libvorbis_read_pcm_frames(ma_libvorbis* pVorbis, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
if (pVorbis == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBVORBIS)
{
/* We always use floating point format. */
ma_result result = MA_SUCCESS; /* Must be initialized to MA_SUCCESS. */
ma_uint64 totalFramesRead;
ma_format format;
ma_uint32 channels;
ma_libvorbis_get_data_format(pVorbis, &format, &channels, NULL, NULL, 0);
totalFramesRead = 0;
while (totalFramesRead < frameCount) {
long libvorbisResult;
int framesToRead;
ma_uint64 framesRemaining;
framesRemaining = (frameCount - totalFramesRead);
framesToRead = 1024;
if (framesToRead > framesRemaining) {
framesToRead = (int)framesRemaining;
}
if (format == ma_format_f32) {
float** ppFramesF32;
libvorbisResult = ov_read_float(&pVorbis->vf, &ppFramesF32, framesToRead, NULL);
if (libvorbisResult < 0) {
result = MA_ERROR; /* Error while decoding. */
break;
} else {
/* Frames need to be interleaved. */
ma_interleave_pcm_frames(format, channels, libvorbisResult, ppFramesF32, ma_offset_pcm_frames_ptr(pFramesOut, totalFramesRead, format, channels));
totalFramesRead += libvorbisResult;
if (libvorbisResult == 0) {
result = MA_AT_END;
break;
}
}
} else {
libvorbisResult = ov_read(&pVorbis->vf, ma_offset_pcm_frames_ptr(pFramesOut, totalFramesRead, format, channels), framesToRead * ma_get_bytes_per_frame(format, channels), 0, 2, 1, NULL);
if (libvorbisResult < 0) {
result = MA_ERROR; /* Error while decoding. */
break;
} else {
/* Conveniently, there's no need to interleaving when using ov_read(). I'm not sure why ov_read_float() is different in that regard... */
totalFramesRead += libvorbisResult / ma_get_bytes_per_frame(format, channels);
if (libvorbisResult == 0) {
result = MA_AT_END;
break;
}
}
}
}
if (pFramesRead != NULL) {
*pFramesRead = totalFramesRead;
}
return result;
}
#else
{
/* libvorbis is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
(void)pFramesOut;
(void)frameCount;
(void)pFramesRead;
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libvorbis_seek_to_pcm_frame(ma_libvorbis* pVorbis, ma_uint64 frameIndex)
{
if (pVorbis == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBVORBIS)
{
int libvorbisResult = ov_pcm_seek(&pVorbis->vf, (ogg_int64_t)frameIndex);
if (libvorbisResult != 0) {
if (libvorbisResult == OV_ENOSEEK) {
return MA_INVALID_OPERATION; /* Not seekable. */
} else if (libvorbisResult == OV_EINVAL) {
return MA_INVALID_ARGS;
} else {
return MA_ERROR;
}
}
return MA_SUCCESS;
}
#else
{
/* libvorbis is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
(void)frameIndex;
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libvorbis_get_data_format(ma_libvorbis* pVorbis, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap)
{
/* Defaults for safety. */
if (pFormat != NULL) {
*pFormat = ma_format_unknown;
}
if (pChannels != NULL) {
*pChannels = 0;
}
if (pSampleRate != NULL) {
*pSampleRate = 0;
}
if (pChannelMap != NULL) {
MA_ZERO_MEMORY(pChannelMap, sizeof(*pChannelMap) * channelMapCap);
}
if (pVorbis == NULL) {
return MA_INVALID_OPERATION;
}
if (pFormat != NULL) {
*pFormat = pVorbis->format;
}
#if !defined(MA_NO_LIBVORBIS)
{
vorbis_info* pInfo = ov_info(&pVorbis->vf, 0);
if (pInfo == NULL) {
return MA_INVALID_OPERATION;
}
if (pChannels != NULL) {
*pChannels = pInfo->channels;
}
if (pSampleRate != NULL) {
*pSampleRate = pInfo->rate;
}
if (pChannelMap != NULL) {
ma_get_standard_channel_map(ma_standard_channel_map_vorbis, (ma_uint32)ma_min(pInfo->channels, channelMapCap), pChannelMap);
}
return MA_SUCCESS;
}
#else
{
/* libvorbis is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libvorbis_get_cursor_in_pcm_frames(ma_libvorbis* pVorbis, ma_uint64* pCursor)
{
if (pCursor == NULL) {
return MA_INVALID_ARGS;
}
*pCursor = 0; /* Safety. */
if (pVorbis == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBVORBIS)
{
ogg_int64_t offset = ov_pcm_tell(&pVorbis->vf);
if (offset < 0) {
return MA_INVALID_FILE;
}
*pCursor = (ma_uint64)offset;
return MA_SUCCESS;
}
#else
{
/* libvorbis is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libvorbis_get_length_in_pcm_frames(ma_libvorbis* pVorbis, ma_uint64* pLength)
{
if (pLength == NULL) {
return MA_INVALID_ARGS;
}
*pLength = 0; /* Safety. */
if (pVorbis == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBVORBIS)
{
/* I don't know how to reliably retrieve the length in frames using libvorbis, so returning 0 for now. */
*pLength = 0;
return MA_SUCCESS;
}
#else
{
/* libvorbis is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
return MA_NOT_IMPLEMENTED;
}
#endif
}
#if !defined(MA_NO_LIBOPUS)
#include <opusfile.h>
#endif
typedef struct
{
ma_data_source_base ds; /* The libopus decoder can be used independently as a data source. */
ma_read_proc onRead;
ma_seek_proc onSeek;
ma_tell_proc onTell;
void* pReadSeekTellUserData;
ma_format format; /* Will be either f32 or s16. */
#if !defined(MA_NO_LIBOPUS)
OggOpusFile* of;
#endif
} ma_libopus;
MA_API ma_result ma_libopus_init(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_libopus* pVorbis);
MA_API ma_result ma_libopus_init_file(const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_libopus* pVorbis);
MA_API void ma_libopus_uninit(ma_libopus* pVorbis, const ma_allocation_callbacks* pAllocationCallbacks);
MA_API ma_result ma_libopus_read_pcm_frames(ma_libopus* pVorbis, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead);
MA_API ma_result ma_libopus_seek_to_pcm_frame(ma_libopus* pVorbis, ma_uint64 frameIndex);
MA_API ma_result ma_libopus_get_data_format(ma_libopus* pVorbis, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap);
MA_API ma_result ma_libopus_get_cursor_in_pcm_frames(ma_libopus* pVorbis, ma_uint64* pCursor);
MA_API ma_result ma_libopus_get_length_in_pcm_frames(ma_libopus* pVorbis, ma_uint64* pLength);
static ma_result ma_libopus_ds_read(ma_data_source* pDataSource, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
return ma_libopus_read_pcm_frames((ma_libopus*)pDataSource, pFramesOut, frameCount, pFramesRead);
}
static ma_result ma_libopus_ds_seek(ma_data_source* pDataSource, ma_uint64 frameIndex)
{
return ma_libopus_seek_to_pcm_frame((ma_libopus*)pDataSource, frameIndex);
}
static ma_result ma_libopus_ds_get_data_format(ma_data_source* pDataSource, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
return ma_libopus_get_data_format((ma_libopus*)pDataSource, pFormat, pChannels, pSampleRate, NULL, 0);
}
static ma_result ma_libopus_ds_get_cursor(ma_data_source* pDataSource, ma_uint64* pCursor)
{
return ma_libopus_get_cursor_in_pcm_frames((ma_libopus*)pDataSource, pCursor);
}
static ma_result ma_libopus_ds_get_length(ma_data_source* pDataSource, ma_uint64* pLength)
{
return ma_libopus_get_length_in_pcm_frames((ma_libopus*)pDataSource, pLength);
}
static ma_data_source_vtable g_ma_libopus_ds_vtable =
{
ma_libopus_ds_read,
ma_libopus_ds_seek,
NULL, /* onMap() */
NULL, /* onUnmap() */
ma_libopus_ds_get_data_format,
ma_libopus_ds_get_cursor,
ma_libopus_ds_get_length
};
#if !defined(MA_NO_LIBOPUS)
static int ma_libopus_of_callback__read(void* pUserData, void* pBufferOut, int bytesToRead)
{
ma_libopus* pOpus = (ma_libopus*)pUserData;
ma_result result;
size_t bytesRead;
result = pOpus->onRead(pOpus->pReadSeekTellUserData, pBufferOut, bytesToRead, &bytesRead);
if (result != MA_SUCCESS) {
return -1;
}
return (int)bytesRead;
}
static int ma_libopus_of_callback__seek(void* pUserData, ogg_int64_t offset, int whence)
{
ma_libopus* pOpus = (ma_libopus*)pUserData;
ma_result result;
ma_seek_origin origin;
if (whence == SEEK_SET) {
origin = ma_seek_origin_start;
} else if (whence == SEEK_END) {
origin = ma_seek_origin_end;
} else {
origin = ma_seek_origin_current;
}
result = pOpus->onSeek(pOpus->pReadSeekTellUserData, offset, origin);
if (result != MA_SUCCESS) {
return -1;
}
return 0;
}
static opus_int64 ma_libopus_of_callback__tell(void* pUserData)
{
ma_libopus* pOpus = (ma_libopus*)pUserData;
ma_result result;
ma_int64 cursor;
if (pOpus->onTell == NULL) {
return -1;
}
result = pOpus->onTell(pOpus->pReadSeekTellUserData, &cursor);
if (result != MA_SUCCESS) {
return -1;
}
return cursor;
}
#endif
static ma_result ma_libopus_init_internal(const ma_decoding_backend_config* pConfig, ma_libopus* pOpus)
{
ma_result result;
ma_data_source_config dataSourceConfig;
if (pOpus == NULL) {
return MA_INVALID_ARGS;
}
MA_ZERO_OBJECT(pOpus);
pOpus->format = ma_format_f32; /* f32 by default. */
if (pConfig != NULL && (pConfig->preferredFormat == ma_format_f32 || pConfig->preferredFormat == ma_format_s16)) {
pOpus->format = pConfig->preferredFormat;
} else {
/* Getting here means something other than f32 and s16 was specified. Just leave this unset to use the default format. */
}
dataSourceConfig = ma_data_source_config_init();
dataSourceConfig.vtable = &g_ma_libopus_ds_vtable;
result = ma_data_source_init(&dataSourceConfig, &pOpus->ds);
if (result != MA_SUCCESS) {
return result; /* Failed to initialize the base data source. */
}
return MA_SUCCESS;
}
MA_API ma_result ma_libopus_init(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_libopus* pOpus)
{
ma_result result;
(void)pAllocationCallbacks; /* Can't seem to find a way to configure memory allocations in libopus. */
result = ma_libopus_init_internal(pConfig, pOpus);
if (result != MA_SUCCESS) {
return result;
}
if (onRead == NULL || onSeek == NULL) {
return MA_INVALID_ARGS; /* onRead and onSeek are mandatory. */
}
pOpus->onRead = onRead;
pOpus->onSeek = onSeek;
pOpus->onTell = onTell;
pOpus->pReadSeekTellUserData = pReadSeekTellUserData;
#if !defined(MA_NO_LIBOPUS)
{
int libopusResult;
OpusFileCallbacks libopusCallbacks;
/* We can now initialize the vorbis decoder. This must be done after we've set up the callbacks. */
libopusCallbacks.read = ma_libopus_of_callback__read;
libopusCallbacks.seek = ma_libopus_of_callback__seek;
libopusCallbacks.close = NULL;
libopusCallbacks.tell = ma_libopus_of_callback__tell;
pOpus->of = op_open_callbacks(pOpus, &libopusCallbacks, NULL, 0, &libopusResult);
if (pOpus->of == NULL) {
return MA_INVALID_FILE;
}
return MA_SUCCESS;
}
#else
{
/* libopus is disabled. */
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libopus_init_file(const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_libopus* pOpus)
{
ma_result result;
(void)pAllocationCallbacks; /* Can't seem to find a way to configure memory allocations in libopus. */
result = ma_libopus_init_internal(pConfig, pOpus);
if (result != MA_SUCCESS) {
return result;
}
#if !defined(MA_NO_LIBOPUS)
{
int libopusResult;
pOpus->of = op_open_file(pFilePath, &libopusResult);
if (pOpus->of == NULL) {
return MA_INVALID_FILE;
}
return MA_SUCCESS;
}
#else
{
/* libopus is disabled. */
(void)pFilePath;
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API void ma_libopus_uninit(ma_libopus* pOpus, const ma_allocation_callbacks* pAllocationCallbacks)
{
if (pOpus == NULL) {
return;
}
(void)pAllocationCallbacks;
#if !defined(MA_NO_LIBOPUS)
{
op_free(pOpus->of);
}
#else
{
/* libopus is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
}
#endif
ma_data_source_uninit(&pOpus->ds);
}
MA_API ma_result ma_libopus_read_pcm_frames(ma_libopus* pOpus, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
if (pOpus == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBOPUS)
{
/* We always use floating point format. */
ma_result result = MA_SUCCESS; /* Must be initialized to MA_SUCCESS. */
ma_uint64 totalFramesRead;
ma_format format;
ma_uint32 channels;
ma_libopus_get_data_format(pOpus, &format, &channels, NULL, NULL, 0);
totalFramesRead = 0;
while (totalFramesRead < frameCount) {
long libopusResult;
int framesToRead;
ma_uint64 framesRemaining;
framesRemaining = (frameCount - totalFramesRead);
framesToRead = 1024;
if (framesToRead > framesRemaining) {
framesToRead = (int)framesRemaining;
}
if (format == ma_format_f32) {
libopusResult = op_read_float(pOpus->of, ma_offset_pcm_frames_ptr(pFramesOut, totalFramesRead, format, channels), framesToRead * channels, NULL);
} else {
libopusResult = op_read (pOpus->of, ma_offset_pcm_frames_ptr(pFramesOut, totalFramesRead, format, channels), framesToRead * channels, NULL);
}
if (libopusResult < 0) {
result = MA_ERROR; /* Error while decoding. */
break;
} else {
totalFramesRead += libopusResult;
if (libopusResult == 0) {
result = MA_AT_END;
break;
}
}
}
if (pFramesRead != NULL) {
*pFramesRead = totalFramesRead;
}
return result;
}
#else
{
/* libopus is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
(void)pFramesOut;
(void)frameCount;
(void)pFramesRead;
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libopus_seek_to_pcm_frame(ma_libopus* pOpus, ma_uint64 frameIndex)
{
if (pOpus == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBOPUS)
{
int libopusResult = op_pcm_seek(pOpus->of, (ogg_int64_t)frameIndex);
if (libopusResult != 0) {
if (libopusResult == OP_ENOSEEK) {
return MA_INVALID_OPERATION; /* Not seekable. */
} else if (libopusResult == OP_EINVAL) {
return MA_INVALID_ARGS;
} else {
return MA_ERROR;
}
}
return MA_SUCCESS;
}
#else
{
/* libopus is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
(void)frameIndex;
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libopus_get_data_format(ma_libopus* pOpus, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap)
{
/* Defaults for safety. */
if (pFormat != NULL) {
*pFormat = ma_format_unknown;
}
if (pChannels != NULL) {
*pChannels = 0;
}
if (pSampleRate != NULL) {
*pSampleRate = 0;
}
if (pChannelMap != NULL) {
MA_ZERO_MEMORY(pChannelMap, sizeof(*pChannelMap) * channelMapCap);
}
if (pOpus == NULL) {
return MA_INVALID_OPERATION;
}
if (pFormat != NULL) {
*pFormat = pOpus->format;
}
#if !defined(MA_NO_LIBOPUS)
{
ma_uint32 channels = op_channel_count(pOpus->of, -1);
if (pChannels != NULL) {
*pChannels = channels;
}
if (pSampleRate != NULL) {
*pSampleRate = 48000;
}
if (pChannelMap != NULL) {
ma_get_standard_channel_map(ma_standard_channel_map_vorbis, (ma_uint32)ma_min(channels, channelMapCap), pChannelMap);
}
return MA_SUCCESS;
}
#else
{
/* libopus is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libopus_get_cursor_in_pcm_frames(ma_libopus* pOpus, ma_uint64* pCursor)
{
if (pCursor == NULL) {
return MA_INVALID_ARGS;
}
*pCursor = 0; /* Safety. */
if (pOpus == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBOPUS)
{
ogg_int64_t offset = op_pcm_tell(pOpus->of);
if (offset < 0) {
return MA_INVALID_FILE;
}
*pCursor = (ma_uint64)offset;
return MA_SUCCESS;
}
#else
{
/* libopus is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
return MA_NOT_IMPLEMENTED;
}
#endif
}
MA_API ma_result ma_libopus_get_length_in_pcm_frames(ma_libopus* pOpus, ma_uint64* pLength)
{
if (pLength == NULL) {
return MA_INVALID_ARGS;
}
*pLength = 0; /* Safety. */
if (pOpus == NULL) {
return MA_INVALID_ARGS;
}
#if !defined(MA_NO_LIBOPUS)
{
ogg_int64_t length = op_pcm_total(pOpus->of, -1);
if (length < 0) {
return MA_ERROR;
}
*pLength = (ma_uint64)length;
return MA_SUCCESS;
}
#else
{
/* libopus is disabled. Should never hit this since initialization would have failed. */
MA_ASSERT(MA_FALSE);
return MA_NOT_IMPLEMENTED;
}
#endif
}
/*
In this example we're going to be implementing our custom decoders as an extension to the ma_decoder
object. We declare our decoding backends after the ma_decoder object which allows us to avoid a
memory allocation. There are many ways to manage the backend objects so use whatever works best for
your particular scenario.
*/
typedef struct
{
ma_decoder base; /* Must be the first member so we can cast between ma_decoder_ex and ma_decoder. */
union
{
ma_libvorbis libvorbis;
ma_libopus libopus;
} backends;
} ma_decoder_ex;
static ma_result ma_decoder_ex_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_decoder_ex* pDecoderEx = (ma_decoder_ex*)pUserData;
ma_result result;
/*
NOTE: We don't need to allocate any memory for the libvorbis object here because our backend
data is just extended off the ma_decoder object (ma_decode_ex) which is passed in as a
parameter to this function. We therefore need only cast to ma_decoder_ex and reference data
directly from that structure.
*/
*ppBackend = (ma_data_source*)&pDecoderEx->backends.libvorbis;
result = ma_libvorbis_init(onRead, onSeek, onTell, pReadSeekTellUserData, pConfig, pAllocationCallbacks, &pDecoderEx->backends.libvorbis);
if (result != MA_SUCCESS) {
return result;
}
return MA_SUCCESS;
}
static ma_result ma_decoder_ex_init_file__libvorbis(void* pUserData, const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend)
{
ma_decoder_ex* pDecoderEx = (ma_decoder_ex*)pUserData;
ma_result result;
*ppBackend = (ma_data_source*)&pDecoderEx->backends.libvorbis;
result = ma_libvorbis_init_file(pFilePath, pConfig, pAllocationCallbacks, &pDecoderEx->backends.libvorbis);
if (result != MA_SUCCESS) {
return result;
}
return MA_SUCCESS;
}
static void ma_decoder_ex_uninit__libvorbis(void* pUserData, ma_data_source* pBackend, const ma_allocation_callbacks* pAllocationCallbacks)
{
ma_libvorbis* pVorbis = (ma_libvorbis*)pBackend;
ma_libvorbis_uninit(pVorbis, pAllocationCallbacks);
/* No need to free the pVorbis object because it is sitting in the containing ma_decoder_ex object. */
(void)pUserData;
}
static ma_result ma_decoder_ex_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_decoder_ex_init__libvorbis,
ma_decoder_ex_init_file__libvorbis,
NULL, /* onInitFileW() */
NULL, /* onInitMemory() */
ma_decoder_ex_uninit__libvorbis,
ma_decoder_ex_get_channel_map__libvorbis
};
static ma_result ma_decoder_ex_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_decoder_ex* pDecoderEx = (ma_decoder_ex*)pUserData;
ma_result result;
/*
NOTE: We don't need to allocate any memory for the libopus object here because our backend
data is just extended off the ma_decoder object (ma_decode_ex) which is passed in as a
parameter to this function. We therefore need only cast to ma_decoder_ex and reference data
directly from that structure.
*/
*ppBackend = (ma_data_source*)&pDecoderEx->backends.libopus;
result = ma_libopus_init(onRead, onSeek, onTell, pReadSeekTellUserData, pConfig, pAllocationCallbacks, &pDecoderEx->backends.libopus);
if (result != MA_SUCCESS) {
return result;
}
return MA_SUCCESS;
}
static ma_result ma_decoder_ex_init_file__libopus(void* pUserData, const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend)
{
ma_decoder_ex* pDecoderEx = (ma_decoder_ex*)pUserData;
ma_result result;
*ppBackend = (ma_data_source*)&pDecoderEx->backends.libopus;
result = ma_libopus_init_file(pFilePath, pConfig, pAllocationCallbacks, &pDecoderEx->backends.libopus);
if (result != MA_SUCCESS) {
return result;
}
return MA_SUCCESS;
}
static void ma_decoder_ex_uninit__libopus(void* pUserData, ma_data_source* pBackend, const ma_allocation_callbacks* pAllocationCallbacks)
{
ma_libopus* pOpus = (ma_libopus*)pBackend;
ma_libopus_uninit(pOpus, pAllocationCallbacks);
/* No need to free the pOpus object because it is sitting in the containing ma_decoder_ex object. */
(void)pUserData;
}
static ma_result ma_decoder_ex_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_decoder_ex_init__libopus,
ma_decoder_ex_init_file__libopus,
NULL, /* onInitFileW() */
NULL, /* onInitMemory() */
ma_decoder_ex_uninit__libopus,
ma_decoder_ex_get_channel_map__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, MA_TRUE);
(void)pInput;
}
int main(int argc, char** argv)
{
ma_result result;
ma_decoder_config decoderConfig;
ma_decoder_ex 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 = &decoder; /* 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.customBackendVTableCount = sizeof(pCustomBackendVTables) / sizeof(pCustomBackendVTables[0]);
result = ma_decoder_init_file(argv[1], &decoderConfig, &decoder.base);
if (result != MA_SUCCESS) {
printf("Failed to initialize decoder.");
return -1;
}
/* Initialize the device. */
result = ma_data_source_get_data_format(&decoder, &format, &channels, &sampleRate);
if (result != MA_SUCCESS) {
printf("Failed to retrieve decoder data format.");
ma_decoder_uninit(&decoder.base);
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.base);
return -1;
}
if (ma_device_start(&device) != MA_SUCCESS) {
printf("Failed to start playback device.\n");
ma_device_uninit(&device);
ma_decoder_uninit(&decoder.base);
return -1;
}
printf("Press Enter to quit...");
getchar();
ma_device_uninit(&device);
ma_decoder_uninit(&decoder.base);
return 0;
}
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