kwlError kwlWaveBank_loadAudioData(kwlWaveBank* waveBank,
const char* path,
int threaded,
kwlWaveBankFinishedLoadingCallback callback)
{
if (threaded == 0)
{
/*perform blocking loading*/
kwlInputStream stream;
kwlInputStream_initWithFile(&stream, path);
return kwlWaveBank_loadAudioDataItems(waveBank, &stream);
}
else
{
/*do asynchronous loading*/
kwlInputStream_initWithFile(&waveBank->loadingThread.inputStream, path);
waveBank->loadingThread.waveBank = waveBank;
waveBank->loadingThread.callback = callback;
kwlThreadCreate(&waveBank->loadingThread.thread,
kwlWaveBank_loadingThreadEntryPoint,
waveBank);
return KWL_NO_ERROR;
}
}
kwlError kwlDecoder_init(kwlDecoder* decoder, kwlEventInstance* event)
{
kwlAudioData* audioData = event->definition_engine->streamAudioData;
/*reset the decoder struct.*/
kwlMemset(decoder, 0, sizeof(kwlDecoder));
decoder->loop = event->definition_engine->loopIfStreaming;
/*
* Hook up audio data, that could either be from a file or from an already loaded buffer
*/
if (audioData->streamFromDisk != 0)
{
KWL_ASSERT(audioData->fileOffset >= 0);
kwlError result = kwlInputStream_initWithFileRegion(&decoder->audioDataStream,
audioData->waveBank->waveBankFilePath,
audioData->fileOffset,
audioData->numBytes);
KWL_ASSERT(result == KWL_NO_ERROR);
}
else
{
kwlInputStream_initWithBuffer(&decoder->audioDataStream,
audioData->bytes,
0,
audioData->numBytes);
}
/*
* do codec specific initialization.
*/
kwlError result = KWL_UNSUPPORTED_ENCODING;
if (audioData->encoding == KWL_ENCODING_IMA_ADPCM)
{
result = kwlInitDecoderIMAADPCM(decoder);
}
else if (audioData->encoding == KWL_ENCODING_VORBIS)
{
result = kwlInitDecoderOggVorbis(decoder);
}
else if (kwlAudioData_isLinearPCM(audioData))
{
result = kwlInitDecoderPCM(decoder);
}
#ifdef KWL_IPHONE
else if (audioData->encoding == KWL_ENCODING_UNKNOWN)
{
/*try the iphone decoder*/
result = kwlInitDecoderIPhone(decoder);
}
#endif /*KWL_IPHONE*/
if (result != KWL_NO_ERROR)
{
decoder->deinit(decoder);
return result;
}
KWL_ASSERT(decoder->numChannels > 0);
decoder->currentDecodedBuffer =
(short*)KWL_MALLOC(sizeof(short) * decoder->maxDecodedBufferSize, "decoder back buffer");
decoder->currentDecodedBufferFront =
(short*)KWL_MALLOC(sizeof(short) * decoder->maxDecodedBufferSize, "decoder front buffer");
decoder->currentDecodedBufferSizeInBytes = 0;
/*
* Before starting the decoding thread, call the decode function
* synchronously to get the first buffer of decoded samples.
*/
int decodingResult = decoder->decodeBuffer(decoder);
kwlDecoder_swapBuffers(decoder);
/*TODO: check the decoding result. the event could be done playing here.*/
event->currentPCMFrameIndex = 0;
event->currentPCMBuffer = decoder->currentDecodedBufferFront;
event->currentPCMBufferSize = decoder->currentDecodedBufferSizeInBytes / (2 * decoder->numChannels);
event->currentNumChannels = decoder->numChannels;
/*Create a semaphore with a unique name based on the addess of the decoder*/
sprintf(decoder->semaphoreName, "decoder%d", (int)decoder);
decoder->semaphore = kwlSemaphoreOpen(decoder->semaphoreName);
kwlSemaphorePost(decoder->semaphore);
/*Fire up the decoding thread.*/
kwlThreadCreate(&decoder->decodingThread, kwlDecoder_decodingLoop, decoder);
return result;
}
