From 13252284e53776a1c2ee1aa488ed7a6c3d528cfd Mon Sep 17 00:00:00 2001 From: David Reid Date: Thu, 1 Jul 2021 16:01:08 +1000 Subject: [PATCH] Update the MP3 decoder to use the new backend infrastructure. --- miniaudio.h | 660 +++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 581 insertions(+), 79 deletions(-) diff --git a/miniaudio.h b/miniaudio.h index fc2b311a..1ecfe02d 100644 --- a/miniaudio.h +++ b/miniaudio.h @@ -47052,130 +47052,632 @@ static ma_result ma_decoder_init_flac__internal(const ma_decoder_config* pConfig #ifdef dr_mp3_h #define MA_HAS_MP3 -static size_t ma_decoder_internal_on_read__mp3(void* pUserData, void* pBufferOut, size_t bytesToRead) +typedef struct { - ma_decoder* pDecoder = (ma_decoder*)pUserData; + ma_data_source_base ds; + ma_read_proc onRead; + ma_seek_proc onSeek; + ma_tell_proc onTell; + void* pReadSeekTellUserData; + ma_format format; /* Can be f32 or s16. */ +#if !defined(MA_NO_MP3) + drmp3 dr; +#endif +} ma_mp3; + +MA_API ma_result ma_mp3_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_mp3* pMP3); +MA_API ma_result ma_mp3_init_file(const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_mp3* pMP3); +MA_API ma_result ma_mp3_init_file_w(const wchar_t* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_mp3* pMP3); +MA_API ma_result ma_mp3_init_memory(const void* pData, size_t dataSize, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_mp3* pMP3); +MA_API void ma_mp3_uninit(ma_mp3* pMP3, const ma_allocation_callbacks* pAllocationCallbacks); +MA_API ma_result ma_mp3_read_pcm_frames(ma_mp3* pMP3, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead); +MA_API ma_result ma_mp3_seek_to_pcm_frame(ma_mp3* pMP3, ma_uint64 frameIndex); +MA_API ma_result ma_mp3_get_data_format(ma_mp3* pMP3, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate, ma_channel* pChannelMap, size_t channelMapCap); +MA_API ma_result ma_mp3_get_cursor_in_pcm_frames(ma_mp3* pMP3, ma_uint64* pCursor); +MA_API ma_result ma_mp3_get_length_in_pcm_frames(ma_mp3* pMP3, ma_uint64* pLength); + + +static ma_result ma_mp3_ds_read(ma_data_source* pDataSource, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead) +{ + return ma_mp3_read_pcm_frames((ma_mp3*)pDataSource, pFramesOut, frameCount, pFramesRead); +} + +static ma_result ma_mp3_ds_seek(ma_data_source* pDataSource, ma_uint64 frameIndex) +{ + return ma_mp3_seek_to_pcm_frame((ma_mp3*)pDataSource, frameIndex); +} + +static ma_result ma_mp3_ds_get_data_format(ma_data_source* pDataSource, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate) +{ + return ma_mp3_get_data_format((ma_mp3*)pDataSource, pFormat, pChannels, pSampleRate, NULL, 0); +} + +static ma_result ma_mp3_ds_get_cursor(ma_data_source* pDataSource, ma_uint64* pCursor) +{ + return ma_mp3_get_cursor_in_pcm_frames((ma_mp3*)pDataSource, pCursor); +} + +static ma_result ma_mp3_ds_get_length(ma_data_source* pDataSource, ma_uint64* pLength) +{ + return ma_mp3_get_length_in_pcm_frames((ma_mp3*)pDataSource, pLength); +} + +static ma_data_source_vtable g_ma_mp3_ds_vtable = +{ + ma_mp3_ds_read, + ma_mp3_ds_seek, + NULL, /* onMap() */ + NULL, /* onUnmap() */ + ma_mp3_ds_get_data_format, + ma_mp3_ds_get_cursor, + ma_mp3_ds_get_length +}; + + +#if !defined(MA_NO_MP3) +static drmp3_allocation_callbacks drmp3_allocation_callbacks_from_miniaudio(const ma_allocation_callbacks* pAllocationCallbacks) +{ + drmp3_allocation_callbacks callbacks; + + if (pAllocationCallbacks != NULL) { + callbacks.onMalloc = pAllocationCallbacks->onMalloc; + callbacks.onRealloc = pAllocationCallbacks->onRealloc; + callbacks.onFree = pAllocationCallbacks->onFree; + callbacks.pUserData = pAllocationCallbacks->pUserData; + } else { + callbacks.onMalloc = ma__malloc_default; + callbacks.onRealloc = ma__realloc_default; + callbacks.onFree = ma__free_default; + callbacks.pUserData = NULL; + } + + return callbacks; +} + +static size_t ma_mp3_dr_callback__read(void* pUserData, void* pBufferOut, size_t bytesToRead) +{ + ma_mp3* pMP3 = (ma_mp3*)pUserData; ma_result result; size_t bytesRead; - MA_ASSERT(pDecoder != NULL); + MA_ASSERT(pMP3 != NULL); - result = ma_decoder_read_bytes(pDecoder, pBufferOut, bytesToRead, &bytesRead); + result = pMP3->onRead(pMP3->pReadSeekTellUserData, pBufferOut, bytesToRead, &bytesRead); (void)result; return bytesRead; } -static drmp3_bool32 ma_decoder_internal_on_seek__mp3(void* pUserData, int offset, drmp3_seek_origin origin) +static drmp3_bool32 ma_mp3_dr_callback__seek(void* pUserData, int offset, drmp3_seek_origin origin) { - ma_decoder* pDecoder = (ma_decoder*)pUserData; + ma_mp3* pMP3 = (ma_mp3*)pUserData; ma_result result; + ma_seek_origin maSeekOrigin; - MA_ASSERT(pDecoder != NULL); + MA_ASSERT(pMP3 != NULL); - result = ma_decoder_seek_bytes(pDecoder, offset, (origin == drmp3_seek_origin_start) ? ma_seek_origin_start : ma_seek_origin_current); + maSeekOrigin = ma_seek_origin_start; + if (origin == drmp3_seek_origin_current) { + maSeekOrigin = ma_seek_origin_current; + } + + result = pMP3->onSeek(pMP3->pReadSeekTellUserData, offset, maSeekOrigin); if (result != MA_SUCCESS) { return MA_FALSE; } return MA_TRUE; } - -static ma_uint64 ma_decoder_internal_on_read_pcm_frames__mp3(ma_decoder* pDecoder, void* pFramesOut, ma_uint64 frameCount) -{ - drmp3* pMP3; - - MA_ASSERT(pDecoder != NULL); - MA_ASSERT(pFramesOut != NULL); - - pMP3 = (drmp3*)pDecoder->pInternalDecoder; - MA_ASSERT(pMP3 != NULL); - -#if defined(DR_MP3_FLOAT_OUTPUT) - MA_ASSERT(pDecoder->internalFormat == ma_format_f32); - return drmp3_read_pcm_frames_f32(pMP3, frameCount, (float*)pFramesOut); -#else - MA_ASSERT(pDecoder->internalFormat == ma_format_s16); - return drmp3_read_pcm_frames_s16(pMP3, frameCount, (drmp3_int16*)pFramesOut); #endif -} -static ma_result ma_decoder_internal_on_seek_to_pcm_frame__mp3(ma_decoder* pDecoder, ma_uint64 frameIndex) +static ma_result ma_mp3_init_internal(const ma_decoding_backend_config* pConfig, ma_mp3* pMP3) { - drmp3* pMP3; - drmp3_bool32 result; + ma_result result; + ma_data_source_config dataSourceConfig; - pMP3 = (drmp3*)pDecoder->pInternalDecoder; - MA_ASSERT(pMP3 != NULL); - - result = drmp3_seek_to_pcm_frame(pMP3, frameIndex); - if (result) { - return MA_SUCCESS; - } else { - return MA_ERROR; + if (pMP3 == NULL) { + return MA_INVALID_ARGS; + } + + MA_ZERO_OBJECT(pMP3); + pMP3->format = ma_format_f32; /* f32 by default. */ + + if (pConfig != NULL && (pConfig->preferredFormat == ma_format_f32 || pConfig->preferredFormat == ma_format_s16)) { + pMP3->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_mp3_ds_vtable; + + result = ma_data_source_init(&dataSourceConfig, &pMP3->ds); + if (result != MA_SUCCESS) { + return result; /* Failed to initialize the base data source. */ } -} -static ma_result ma_decoder_internal_on_uninit__mp3(ma_decoder* pDecoder) -{ - drmp3_uninit((drmp3*)pDecoder->pInternalDecoder); - ma__free_from_callbacks(pDecoder->pInternalDecoder, &pDecoder->allocationCallbacks); return MA_SUCCESS; } -static ma_uint64 ma_decoder_internal_on_get_length_in_pcm_frames__mp3(ma_decoder* pDecoder) +MA_API ma_result ma_mp3_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_mp3* pMP3) { - return drmp3_get_pcm_frame_count((drmp3*)pDecoder->pInternalDecoder); + ma_result result; + + result = ma_mp3_init_internal(pConfig, pMP3); + if (result != MA_SUCCESS) { + return result; + } + + if (onRead == NULL || onSeek == NULL) { + return MA_INVALID_ARGS; /* onRead and onSeek are mandatory. */ + } + + pMP3->onRead = onRead; + pMP3->onSeek = onSeek; + pMP3->onTell = onTell; + pMP3->pReadSeekTellUserData = pReadSeekTellUserData; + + #if !defined(MA_NO_MP3) + { + drmp3_allocation_callbacks mp3AllocationCallbacks = drmp3_allocation_callbacks_from_miniaudio(pAllocationCallbacks); + drmp3_bool32 mp3Result; + + mp3Result = drmp3_init(&pMP3->dr, ma_mp3_dr_callback__read, ma_mp3_dr_callback__seek, pMP3, &mp3AllocationCallbacks); + if (mp3Result != MA_TRUE) { + return MA_INVALID_FILE; + } + + return MA_SUCCESS; + } + #else + { + /* mp3 is disabled. */ + (void)pAllocationCallbacks; + return MA_NOT_IMPLEMENTED; + } + #endif } -static ma_result ma_decoder_init_mp3__internal(const ma_decoder_config* pConfig, ma_decoder* pDecoder) +MA_API ma_result ma_mp3_init_file(const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_mp3* pMP3) { - drmp3* pMP3; - drmp3_allocation_callbacks allocationCallbacks; + ma_result result; - MA_ASSERT(pConfig != NULL); - MA_ASSERT(pDecoder != NULL); + result = ma_mp3_init_internal(pConfig, pMP3); + if (result != MA_SUCCESS) { + return result; + } - (void)pConfig; + #if !defined(MA_NO_MP3) + { + drmp3_allocation_callbacks mp3AllocationCallbacks = drmp3_allocation_callbacks_from_miniaudio(pAllocationCallbacks); + drmp3_bool32 mp3Result; - pMP3 = (drmp3*)ma__malloc_from_callbacks(sizeof(*pMP3), &pDecoder->allocationCallbacks); + mp3Result = drmp3_init_file(&pMP3->dr, pFilePath, &mp3AllocationCallbacks); + if (mp3Result != MA_TRUE) { + return MA_INVALID_FILE; + } + + return MA_SUCCESS; + } + #else + { + /* mp3 is disabled. */ + (void)pFilePath; + (void)pAllocationCallbacks; + return MA_NOT_IMPLEMENTED; + } + #endif +} + +MA_API ma_result ma_mp3_init_file_w(const wchar_t* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_mp3* pMP3) +{ + ma_result result; + + result = ma_mp3_init_internal(pConfig, pMP3); + if (result != MA_SUCCESS) { + return result; + } + + #if !defined(MA_NO_MP3) + { + drmp3_allocation_callbacks mp3AllocationCallbacks = drmp3_allocation_callbacks_from_miniaudio(pAllocationCallbacks); + drmp3_bool32 mp3Result; + + mp3Result = drmp3_init_file_w(&pMP3->dr, pFilePath, &mp3AllocationCallbacks); + if (mp3Result != MA_TRUE) { + return MA_INVALID_FILE; + } + + return MA_SUCCESS; + } + #else + { + /* mp3 is disabled. */ + (void)pFilePath; + (void)pAllocationCallbacks; + return MA_NOT_IMPLEMENTED; + } + #endif +} + +MA_API ma_result ma_mp3_init_memory(const void* pData, size_t dataSize, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_mp3* pMP3) +{ + ma_result result; + + result = ma_mp3_init_internal(pConfig, pMP3); + if (result != MA_SUCCESS) { + return result; + } + + #if !defined(MA_NO_MP3) + { + drmp3_allocation_callbacks mp3AllocationCallbacks = drmp3_allocation_callbacks_from_miniaudio(pAllocationCallbacks); + drmp3_bool32 mp3Result; + + mp3Result = drmp3_init_memory(&pMP3->dr, pData, dataSize, &mp3AllocationCallbacks); + if (mp3Result != MA_TRUE) { + return MA_INVALID_FILE; + } + + return MA_SUCCESS; + } + #else + { + /* mp3 is disabled. */ + (void)pData; + (void)dataSize; + (void)pAllocationCallbacks; + return MA_NOT_IMPLEMENTED; + } + #endif +} + +MA_API void ma_mp3_uninit(ma_mp3* pMP3, const ma_allocation_callbacks* pAllocationCallbacks) +{ + if (pMP3 == NULL) { + return; + } + + (void)pAllocationCallbacks; + + #if !defined(MA_NO_MP3) + { + drmp3_uninit(&pMP3->dr); + } + #else + { + /* mp3 is disabled. Should never hit this since initialization would have failed. */ + MA_ASSERT(MA_FALSE); + } + #endif + + ma_data_source_uninit(&pMP3->ds); +} + +MA_API ma_result ma_mp3_read_pcm_frames(ma_mp3* pMP3, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead) +{ + if (pMP3 == NULL) { + return MA_INVALID_ARGS; + } + + #if !defined(MA_NO_MP3) + { + /* We always use floating point format. */ + ma_result result = MA_SUCCESS; /* Must be initialized to MA_SUCCESS. */ + ma_uint64 totalFramesRead = 0; + ma_format format; + + ma_mp3_get_data_format(pMP3, &format, NULL, NULL, NULL, 0); + + switch (format) + { + case ma_format_f32: + { + totalFramesRead = drmp3_read_pcm_frames_f32(&pMP3->dr, frameCount, (float*)pFramesOut); + } break; + + case ma_format_s16: + { + totalFramesRead = drmp3_read_pcm_frames_s16(&pMP3->dr, frameCount, (drmp3_int16*)pFramesOut); + } break; + + case ma_format_u8: + case ma_format_s24: + case ma_format_s32: + case ma_format_unknown: + default: + { + return MA_INVALID_OPERATION; + }; + } + + /* In the future we'll update dr_mp3 to return MA_AT_END for us. */ + if (totalFramesRead == 0) { + result = MA_AT_END; + } + + if (pFramesRead != NULL) { + *pFramesRead = totalFramesRead; + } + + return result; + } + #else + { + /* mp3 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_mp3_seek_to_pcm_frame(ma_mp3* pMP3, ma_uint64 frameIndex) +{ + if (pMP3 == NULL) { + return MA_INVALID_ARGS; + } + + #if !defined(MA_NO_MP3) + { + drmp3_bool32 mp3Result; + + mp3Result = drmp3_seek_to_pcm_frame(&pMP3->dr, frameIndex); + if (mp3Result != DRMP3_TRUE) { + return MA_ERROR; + } + + return MA_SUCCESS; + } + #else + { + /* mp3 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_mp3_get_data_format(ma_mp3* pMP3, 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 (pMP3 == NULL) { + return MA_INVALID_OPERATION; + } + + if (pFormat != NULL) { + *pFormat = pMP3->format; + } + + #if !defined(MA_NO_MP3) + { + if (pChannels != NULL) { + *pChannels = pMP3->dr.channels; + } + + if (pSampleRate != NULL) { + *pSampleRate = pMP3->dr.sampleRate; + } + + if (pChannelMap != NULL) { + ma_get_standard_channel_map(ma_standard_channel_map_default, (ma_uint32)ma_min(pMP3->dr.channels, channelMapCap), pChannelMap); + } + + return MA_SUCCESS; + } + #else + { + /* mp3 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_mp3_get_cursor_in_pcm_frames(ma_mp3* pMP3, ma_uint64* pCursor) +{ + if (pCursor == NULL) { + return MA_INVALID_ARGS; + } + + *pCursor = 0; /* Safety. */ + + if (pMP3 == NULL) { + return MA_INVALID_ARGS; + } + + #if !defined(MA_NO_MP3) + { + *pCursor = pMP3->dr.currentPCMFrame; + + return MA_SUCCESS; + } + #else + { + /* mp3 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_mp3_get_length_in_pcm_frames(ma_mp3* pMP3, ma_uint64* pLength) +{ + if (pLength == NULL) { + return MA_INVALID_ARGS; + } + + *pLength = 0; /* Safety. */ + + if (pMP3 == NULL) { + return MA_INVALID_ARGS; + } + + #if !defined(MA_NO_MP3) + { + *pLength = drmp3_get_pcm_frame_count(&pMP3->dr); + + return MA_SUCCESS; + } + #else + { + /* mp3 is disabled. Should never hit this since initialization would have failed. */ + MA_ASSERT(MA_FALSE); + return MA_NOT_IMPLEMENTED; + } + #endif +} + + +static ma_result ma_decoding_backend_init__mp3(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_mp3* pMP3; + + (void)pUserData; /* For now not using pUserData, but once we start storing the vorbis decoder state within the ma_decoder structure this will be set to the decoder so we can avoid a malloc. */ + + /* For now we're just allocating the decoder backend on the heap. */ + pMP3 = (ma_mp3*)ma_malloc(sizeof(*pMP3), pAllocationCallbacks); if (pMP3 == NULL) { return MA_OUT_OF_MEMORY; } - allocationCallbacks.pUserData = pDecoder->allocationCallbacks.pUserData; - allocationCallbacks.onMalloc = pDecoder->allocationCallbacks.onMalloc; - allocationCallbacks.onRealloc = pDecoder->allocationCallbacks.onRealloc; - allocationCallbacks.onFree = pDecoder->allocationCallbacks.onFree; - - /* - Try opening the decoder first. We always use whatever dr_mp3 reports for channel count and sample rate. The format is determined by - the presence of DR_MP3_FLOAT_OUTPUT. - */ - if (!drmp3_init(pMP3, ma_decoder_internal_on_read__mp3, ma_decoder_internal_on_seek__mp3, pDecoder, &allocationCallbacks)) { - ma__free_from_callbacks(pMP3, &pDecoder->allocationCallbacks); - return MA_ERROR; + result = ma_mp3_init(onRead, onSeek, onTell, pReadSeekTellUserData, pConfig, pAllocationCallbacks, pMP3); + if (result != MA_SUCCESS) { + ma_free(pMP3, pAllocationCallbacks); + return result; } - /* If we get here it means we successfully initialized the MP3 decoder. We can now initialize the rest of the ma_decoder. */ - pDecoder->onReadPCMFrames = ma_decoder_internal_on_read_pcm_frames__mp3; - pDecoder->onSeekToPCMFrame = ma_decoder_internal_on_seek_to_pcm_frame__mp3; - pDecoder->onUninit = ma_decoder_internal_on_uninit__mp3; - pDecoder->onGetLengthInPCMFrames = ma_decoder_internal_on_get_length_in_pcm_frames__mp3; - pDecoder->pInternalDecoder = pMP3; - - /* Internal format. */ -#if defined(DR_MP3_FLOAT_OUTPUT) - pDecoder->internalFormat = ma_format_f32; -#else - pDecoder->internalFormat = ma_format_s16; -#endif - pDecoder->internalChannels = pMP3->channels; - pDecoder->internalSampleRate = pMP3->sampleRate; - ma_get_standard_channel_map(ma_standard_channel_map_default, pDecoder->internalChannels, pDecoder->internalChannelMap); + *ppBackend = pMP3; return MA_SUCCESS; } + +static ma_result ma_decoding_backend_init_file__mp3(void* pUserData, const char* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend) +{ + ma_result result; + ma_mp3* pMP3; + + (void)pUserData; /* For now not using pUserData, but once we start storing the vorbis decoder state within the ma_decoder structure this will be set to the decoder so we can avoid a malloc. */ + + /* For now we're just allocating the decoder backend on the heap. */ + pMP3 = (ma_mp3*)ma_malloc(sizeof(*pMP3), pAllocationCallbacks); + if (pMP3 == NULL) { + return MA_OUT_OF_MEMORY; + } + + result = ma_mp3_init_file(pFilePath, pConfig, pAllocationCallbacks, pMP3); + if (result != MA_SUCCESS) { + ma_free(pMP3, pAllocationCallbacks); + return result; + } + + *ppBackend = pMP3; + + return MA_SUCCESS; +} + +static ma_result ma_decoding_backend_init_file_w__mp3(void* pUserData, const wchar_t* pFilePath, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend) +{ + ma_result result; + ma_mp3* pMP3; + + (void)pUserData; /* For now not using pUserData, but once we start storing the vorbis decoder state within the ma_decoder structure this will be set to the decoder so we can avoid a malloc. */ + + /* For now we're just allocating the decoder backend on the heap. */ + pMP3 = (ma_mp3*)ma_malloc(sizeof(*pMP3), pAllocationCallbacks); + if (pMP3 == NULL) { + return MA_OUT_OF_MEMORY; + } + + result = ma_mp3_init_file_w(pFilePath, pConfig, pAllocationCallbacks, pMP3); + if (result != MA_SUCCESS) { + ma_free(pMP3, pAllocationCallbacks); + return result; + } + + *ppBackend = pMP3; + + return MA_SUCCESS; +} + +static ma_result ma_decoding_backend_init_memory__mp3(void* pUserData, const void* pData, size_t dataSize, const ma_decoding_backend_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source** ppBackend) +{ + ma_result result; + ma_mp3* pMP3; + + (void)pUserData; /* For now not using pUserData, but once we start storing the vorbis decoder state within the ma_decoder structure this will be set to the decoder so we can avoid a malloc. */ + + /* For now we're just allocating the decoder backend on the heap. */ + pMP3 = (ma_mp3*)ma_malloc(sizeof(*pMP3), pAllocationCallbacks); + if (pMP3 == NULL) { + return MA_OUT_OF_MEMORY; + } + + result = ma_mp3_init_memory(pData, dataSize, pConfig, pAllocationCallbacks, pMP3); + if (result != MA_SUCCESS) { + ma_free(pMP3, pAllocationCallbacks); + return result; + } + + *ppBackend = pMP3; + + return MA_SUCCESS; +} + +static void ma_decoding_backend_uninit__mp3(void* pUserData, ma_data_source* pBackend, const ma_allocation_callbacks* pAllocationCallbacks) +{ + ma_mp3* pMP3 = (ma_mp3*)pBackend; + + (void)pUserData; + + ma_mp3_uninit(pMP3, pAllocationCallbacks); + ma_free(pMP3, pAllocationCallbacks); +} + +static ma_result ma_decoding_backend_get_channel_map__mp3(void* pUserData, ma_data_source* pBackend, ma_channel* pChannelMap, size_t channelMapCap) +{ + ma_mp3* pMP3 = (ma_mp3*)pBackend; + + (void)pUserData; + + return ma_mp3_get_data_format(pMP3, NULL, NULL, NULL, pChannelMap, channelMapCap); +} + +static ma_decoding_backend_vtable g_ma_decoding_backend_vtable_mp3 = +{ + ma_decoding_backend_init__mp3, + ma_decoding_backend_init_file__mp3, + ma_decoding_backend_init_file_w__mp3, + ma_decoding_backend_init_memory__mp3, + ma_decoding_backend_uninit__mp3, + ma_decoding_backend_get_channel_map__mp3 +}; + +static ma_result ma_decoder_init_mp3__internal(const ma_decoder_config* pConfig, ma_decoder* pDecoder) +{ + return ma_decoder_init_from_vtable(&g_ma_decoding_backend_vtable_mp3, NULL, pConfig, pDecoder); +} #endif /* dr_mp3_h */ /* Vorbis */