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Restructuring in preparation for future work.

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This commit is contained in:
David Reid
2021-07-01 15:22:13 +10:00
parent c54bb96964
commit e0bfc59bc0
1 changed files with 45 additions and 24 deletions
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miniaudio.h
+45 -24
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@@ -46654,7 +46654,7 @@ static ma_result ma_decoder__init_data_converter(ma_decoder* pDecoder, const ma_
}
/* Custom decoders. */
static ma_result ma_decoder_internal_on_read__custom(void* pUserData, void* pBufferOut, size_t bytesToRead, size_t* pBytesRead)
{
ma_decoder* pDecoder = (ma_decoder*)pUserData;
@@ -46679,54 +46679,75 @@ static ma_result ma_decoder_internal_on_tell__custom(void* pUserData, ma_int64*
return ma_decoder_tell_bytes(pDecoder, pCursor);
}
static ma_result ma_decoder_init_from_vtable(const ma_decoding_backend_vtable* pVTable, void* pVTableUserData, const ma_decoder_config* pConfig, ma_decoder* pDecoder)
{
ma_result result;
ma_decoding_backend_config backendConfig;
ma_data_source* pBackend;
MA_ASSERT(pVTable != NULL);
MA_ASSERT(pConfig != NULL);
MA_ASSERT(pDecoder != NULL);
if (pVTable->onInit == NULL) {
return MA_NOT_IMPLEMENTED;
}
backendConfig = ma_decoding_backend_config_init(pConfig->format);
result = pVTable->onInit(pVTableUserData, ma_decoder_internal_on_read__custom, ma_decoder_internal_on_seek__custom, ma_decoder_internal_on_tell__custom, pDecoder, &backendConfig, &pDecoder->allocationCallbacks, &pBackend);
if (result != MA_SUCCESS) {
return result; /* Failed to initialize the backend from this vtable. */
}
/* Getting here means we were able to initialize the backend so we can now initialize the decoder. */
pDecoder->pBackend = pBackend;
pDecoder->pBackendVTable = pVTable;
pDecoder->pBackendUserData = pConfig->pCustomBackendUserData;
/* Internal format/channels/rate. */
ma_data_source_get_data_format(pDecoder->pBackend, &pDecoder->internalFormat, &pDecoder->internalChannels, &pDecoder->internalSampleRate);
/* Internal channel map. For now we need to use a separate vtable API for this, but later on we'll add this to ma_data_source_get_data_format(). */
if (pVTable->onGetChannelMap == NULL || pVTable->onGetChannelMap(pDecoder->pBackendUserData, pDecoder->pBackend, pDecoder->internalChannelMap, ma_countof(pDecoder->internalChannelMap)) != MA_SUCCESS) {
/* Failed to retrieve the channel map. Assume default. */
ma_get_standard_channel_map(ma_standard_channel_map_default, ma_min(pDecoder->internalChannels, ma_countof(pDecoder->internalChannelMap)), pDecoder->internalChannelMap);
}
return MA_SUCCESS;
}
static ma_result ma_decoder_init_custom__internal(const ma_decoder_config* pConfig, ma_decoder* pDecoder)
{
ma_result result = MA_NO_BACKEND;
ma_data_source* pBackend;
ma_decoding_backend_config backendConfig;
size_t ivtable;
MA_ASSERT(pConfig != NULL);
MA_ASSERT(pDecoder != NULL);
(void)pConfig;
if (pConfig->ppCustomBackendVTables == NULL) {
return MA_NO_BACKEND;
}
backendConfig = ma_decoding_backend_config_init(pConfig->format);
/* The order each backend is listed is what defines the priority. */
for (ivtable = 0; ivtable < pConfig->customBackendCount; ivtable += 1) {
const ma_decoding_backend_vtable* pVTable = pConfig->ppCustomBackendVTables[ivtable];
if (pVTable != NULL && pVTable->onInit != NULL) {
result = pVTable->onInit(pConfig->pCustomBackendUserData, ma_decoder_internal_on_read__custom, ma_decoder_internal_on_seek__custom, ma_decoder_internal_on_tell__custom, pDecoder, &backendConfig, &pDecoder->allocationCallbacks, &pBackend);
result = ma_decoder_init_from_vtable(pVTable, pConfig->pCustomBackendUserData, pConfig, pDecoder);
if (result == MA_SUCCESS) {
/* We found our decoding backend. Now we just need to set up some stuff in the decoder. */
pDecoder->pBackend = pBackend;
pDecoder->pBackendVTable = pVTable;
pDecoder->pBackendUserData = pConfig->pCustomBackendUserData;
/* Internal format/channels/rate. */
ma_data_source_get_data_format(pDecoder->pBackend, &pDecoder->internalFormat, &pDecoder->internalChannels, &pDecoder->internalSampleRate);
/* Internal channel map. For now we need to use a separate vtable API for this, but later on we'll add this to ma_data_source_get_data_format(). */
if (pVTable->onGetChannelMap == NULL || pVTable->onGetChannelMap(pDecoder->pBackendUserData, pDecoder->pBackend, pDecoder->internalChannelMap, ma_countof(pDecoder->internalChannelMap)) != MA_SUCCESS) {
/* Failed to retrieve the channel map. Assume default. */
ma_get_standard_channel_map(ma_standard_channel_map_default, ma_min(pDecoder->internalChannels, ma_countof(pDecoder->internalChannelMap)), pDecoder->internalChannelMap);
}
return MA_SUCCESS;
} else {
/* Initialization failed. Move on to the next one, but seek back to the start. */
/* Initialization failed. Move on to the next one, but seek back to the start first so the next vtable starts from the first byte of the file. */
result = ma_decoder_seek_bytes(pDecoder, 0, ma_seek_origin_start);
if (result != MA_SUCCESS) {
return result; /* Failed to seek back to the start. */
}
}
} else {
/* No onInit callback. */
/* No vtable. */
}
}