kwlError kwlEventInstance_createFreeformEventFromFile(kwlEventInstance** event, const char* const audioFilePath,
kwlEventType type, int streamFromDisk)
{
KWL_ASSERT(streamFromDisk == 0 && "stream flag not supported yet");
/*try to load the audio file data*/
kwlAudioData* audioData = (kwlAudioData*)KWL_MALLOC(sizeof(kwlAudioData),
"freeform event audio data struct");
kwlMemset(audioData, 0, sizeof(kwlAudioData));
kwlError error = kwlLoadAudioFile(audioFilePath, audioData, KWL_CONVERT_TO_INT16_OR_FAIL);
if (error != KWL_NO_ERROR)
{
KWL_FREE(audioData);
return error;
}
if (type == KWL_POSITIONAL &&
audioData->numChannels != 1)
{
kwlAudioData_free(audioData);
KWL_FREE(audioData);
return KWL_POSITIONAL_EVENT_MUST_BE_MONO;
}
return kwlEventInstance_createFreeformEventFromAudioData(event, audioData, type, "freeform event");
}
kwlMixBus* kwlMixBus_alloc()
{
kwlMixBus* newMixBus = (kwlMixBus*)KWL_MALLOC(sizeof(kwlMixBus), "kwlMixBus_alloc");
kwlMemset(newMixBus, 0, sizeof(kwlMixBus));
kwlMixBus_init(newMixBus);
return newMixBus;
}
kwlError kwlEventInstance_createFreeformEventFromBuffer(kwlEventInstance** event, kwlPCMBuffer* buffer, kwlEventType type)
{
if (buffer->numFrames < 1 ||
buffer->numChannels < 1 ||
buffer->numChannels > 2 ||
buffer->pcmData == NULL)
{
return KWL_INVALID_PARAMETER_VALUE;
}
kwlAudioData* audioData = (kwlAudioData*)KWL_MALLOC(sizeof(kwlAudioData),
"freeform event audio data struct");
kwlMemset(audioData, 0, sizeof(kwlAudioData));
audioData->numChannels = buffer->numChannels;
audioData->numFrames = buffer->numFrames;
audioData->numBytes = buffer->numFrames * buffer->numChannels * 2;/*2 bytes per 16 bit sample*/
audioData->bytes = buffer->pcmData;
audioData->encoding = KWL_ENCODING_SIGNED_16BIT_PCM;
/*The id "freeform buffer event" is used later to indicate that the sample data should not be released.
This should really be handled in a better way.*/
return kwlEventInstance_createFreeformEventFromAudioData(event, audioData, type, "freeform buffer event");
}
kwlError kwlWaveBank_verifyWaveBankBinary(kwlEngine* engine,
const char* const waveBankPath,
kwlWaveBank** waveBank)
{
/*Open the file...*/
kwlInputStream stream;
kwlError result = kwlInputStream_initWithFile(&stream, waveBankPath);
if (result != KWL_NO_ERROR)
{
kwlInputStream_close(&stream);
return result;
}
/*... and check the wave bank file identifier.*/
int i;
for (i = 0; i < KWL_WAVE_BANK_BINARY_FILE_IDENTIFIER_LENGTH; i++)
{
const char identifierChari = kwlInputStream_readChar(&stream);
if (identifierChari != KWL_WAVE_BANK_BINARY_FILE_IDENTIFIER[i])
{
/* Not the file identifier we expected. */
kwlInputStream_close(&stream);
return KWL_UNKNOWN_FILE_FORMAT;
}
}
/*Read the ID from the wave bank binary file and find a matching wave bank struct.*/
const char* waveBankToLoadId = kwlInputStream_readASCIIString(&stream);
const int waveBankToLoadnumAudioDataEntries = kwlInputStream_readIntBE(&stream);
const int numWaveBanks = engine->engineData.numWaveBanks;
kwlWaveBank* matchingWaveBank = NULL;
for (i = 0; i < numWaveBanks; i++)
{
if (strcmp(waveBankToLoadId, engine->engineData.waveBanks[i].id) == 0)
{
matchingWaveBank = &engine->engineData.waveBanks[i];
}
}
KWL_FREE((void*)waveBankToLoadId);
if (matchingWaveBank == NULL)
{
/*No matching bank was found. Close the file stream and return an error.*/
kwlInputStream_close(&stream);
return KWL_NO_MATCHING_WAVE_BANK;
}
else if (waveBankToLoadnumAudioDataEntries != matchingWaveBank->numAudioDataEntries)
{
/*A matching wave bank was found but the number of audio data entries
does not match the binary wave bank data.*/
kwlInputStream_close(&stream);
return KWL_WAVE_BANK_ENTRY_MISMATCH;
}
else if (matchingWaveBank->isLoaded != 0)
{
/*The wave bank is already loaded, just set the handle and do nothing.*/
*waveBank = matchingWaveBank;
kwlInputStream_close(&stream);
return KWL_NO_ERROR;
}
/*Store the path the wave bank was loaded from (used when streaming from disk).*/
const int pathLen = strlen(waveBankPath);
matchingWaveBank->waveBankFilePath = (char*)KWL_MALLOC((pathLen + 1) * sizeof(char), "wave bank path string");
strcpy(matchingWaveBank->waveBankFilePath, waveBankPath);
/*Make sure that the entries of the wave bank to load and the wave bank struct line up.*/
for (i = 0; i < waveBankToLoadnumAudioDataEntries; i++)
{
const char* filePathi = kwlInputStream_readASCIIString(&stream);
int matchingEntryIndex = -1;
int j = 0;
for (j = 0; j < waveBankToLoadnumAudioDataEntries; j++)
{
if (strcmp(matchingWaveBank->audioDataItems[j].filePath, filePathi) == 0)
{
matchingEntryIndex = j;
break;
}
}
KWL_FREE((void*)filePathi);
if (matchingEntryIndex < 0)
{
/* This wave bank entry has no corresponding waveform slot. Abort loading.*/
kwlInputStream_close(&stream);
return KWL_WAVE_BANK_ENTRY_MISMATCH;
}
/*skip to the next wave data entry*/
/*const int encoding = */kwlInputStream_readIntBE(&stream);
/*const int streamFromDisk = */kwlInputStream_readIntBE(&stream);
const int numChannels = kwlInputStream_readIntBE(&stream);
KWL_ASSERT((numChannels == 0 || numChannels == 1 || numChannels == 2) && "invalid num channels");
const int numBytes = kwlInputStream_readIntBE(&stream);
KWL_ASSERT(numBytes > 0);
kwlInputStream_skip(&stream, numBytes);
}
/* Reading went well. */
kwlInputStream_close(&stream);
*waveBank = matchingWaveBank;
return KWL_NO_ERROR;
}
kwlError kwlWaveBank_loadAudioDataItems(kwlWaveBank* waveBank, kwlInputStream* stream)
{
/*The input stream is assumed to be valid, so move the
read position to the first audio data entry.*/
kwlInputStream_reset(stream);
kwlInputStream_skip(stream, KWL_WAVE_BANK_BINARY_FILE_IDENTIFIER_LENGTH);
const int strLen = kwlInputStream_readIntBE(stream);
kwlInputStream_skip(stream, strLen);
/*int numEntries = */kwlInputStream_readIntBE(stream);
const int waveBankToLoadnumAudioDataEntries = waveBank->numAudioDataEntries;
for (int i = 0; i < waveBankToLoadnumAudioDataEntries; i++)
{
char* const waveEntryIdi = kwlInputStream_readASCIIString(stream);
kwlAudioData* matchingAudioData = NULL;
int j;
for (int j = 0; j < waveBankToLoadnumAudioDataEntries; j++)
{
kwlAudioData* entryj = &waveBank->audioDataItems[j];
if (strcmp(entryj->filePath, waveEntryIdi) == 0)
{
matchingAudioData = entryj;
break;
}
}
//printf(" loading %s\n", waveEntryIdi);
KWL_FREE(waveEntryIdi);
const kwlAudioEncoding encoding = (kwlAudioEncoding)kwlInputStream_readIntBE(stream);
const int streamFromDisk = kwlInputStream_readIntBE(stream);
const int numChannels = kwlInputStream_readIntBE(stream);
const int numBytes = kwlInputStream_readIntBE(stream);
const int numFrames = numBytes / 2 * numChannels;
/* Check that the audio meta data makes sense */
if (numBytes <= 0)
{
KWL_ASSERT(0 && "the number of audio data bytes must be positive");
return KWL_CORRUPT_BINARY_DATA;
}
if (matchingAudioData == NULL)
{
KWL_ASSERT(0 && "no matching wave bank entry");
return KWL_CORRUPT_BINARY_DATA;
}
if (numChannels != 0 && numChannels != 1 && numChannels != 2)
{
KWL_ASSERT(0 && "invalid number of channels");
return KWL_CORRUPT_BINARY_DATA;
}
/*free any old data*/
kwlAudioData_free(matchingAudioData);
/*Store audio meta data.*/
matchingAudioData->numFrames = numFrames;
matchingAudioData->numChannels = numChannels;
matchingAudioData->numBytes = numBytes;
matchingAudioData->encoding = (kwlAudioEncoding)encoding;
matchingAudioData->streamFromDisk = streamFromDisk;
matchingAudioData->isLoaded = 1;
matchingAudioData->bytes = NULL;
if (streamFromDisk == 0)
{
/*This entry should not be streamed, so allocate audio data up front.*/
matchingAudioData->bytes = KWL_MALLOC(numBytes, "kwlEngine_loadWaveBank");
int bytesRead = kwlInputStream_read(stream,
(signed char*)matchingAudioData->bytes,
numBytes);
if (bytesRead != numBytes)
{
KWL_ASSERT(0 && "error reading wave bank audio data bytes");
return KWL_CORRUPT_BINARY_DATA;
}
}
else
{
/*Store the offset into the wave bank binary files for streaming entries.*/
matchingAudioData->fileOffset = kwlInputStream_tell(stream);
kwlInputStream_skip(stream, numBytes);
}
}
waveBank->isLoaded = 1;
return KWL_NO_ERROR;
}
kwlError kwlEventInstance_createFreeformEventFromAudioData(kwlEventInstance** event, kwlAudioData* audioData, kwlEventType type, const char* eventId)
{
/*create the event. as opposed to a data driven event, a freeform event does
not reference sounds and event definitions in the engine, but own its local data
that is freed when the event is released.*/
kwlEventInstance* createdEvent = (kwlEventInstance*)KWL_MALLOC(sizeof(kwlEventInstance), "freeform event instance");
kwlEventInstance_init(createdEvent);
kwlSound* sound = NULL;
kwlAudioData* streamAudioData = NULL;
/*create a sound if we loaded a PCM file.*/
if (audioData->encoding == KWL_ENCODING_SIGNED_16BIT_PCM)
{
sound = (kwlSound*)KWL_MALLOC(sizeof(kwlSound), "freeform event: sound");
kwlSound_init(sound);
sound->audioDataEntries = (kwlAudioData**)KWL_MALLOC(sizeof(kwlAudioData*),
"freeform event: sound audio data array list");
sound->audioDataEntries[0] = audioData;
sound->numAudioDataEntries = 1;
sound->playbackMode = KWL_SEQUENTIAL;
sound->playbackCount = 1;
sound->deferStop = 0;
sound->gain = 1.0f;
sound->pitch = 1.0f;
sound->pitchVariation = 0.0f;
sound->gainVariation = 0.0f;
}
else
{
KWL_ASSERT(0 && "TODO: support creating non-pcm events");
}
/*create an event definition*/
kwlEventDefinition* eventDefinition =
(kwlEventDefinition*)KWL_MALLOC(sizeof(kwlEventDefinition),
"freeform event definition");
kwlEventDefinition_init(eventDefinition);
eventDefinition->id = eventId;
eventDefinition->instanceCount = 1;
eventDefinition->isPositional = type == KWL_POSITIONAL ? 1 : 0;
eventDefinition->gain = 1.0f;
eventDefinition->pitch = 1.0f;
eventDefinition->innerConeCosAngle = 1.0f;
eventDefinition->outerConeCosAngle = -1.0f;
eventDefinition->outerConeGain = 1.0f;
eventDefinition->retriggerMode = KWL_RETRIGGER;
eventDefinition->stealingMode = KWL_DONT_STEAL;
eventDefinition->streamAudioData = streamAudioData;
eventDefinition->sound = sound;
eventDefinition->numReferencedWaveBanks = 0;
eventDefinition->referencedWaveBanks = NULL;
/*Set the mix bus to NULL. This is how the mixer knows this is a freeform event.
TODO: solve this in some better way?*/
eventDefinition->mixBus = NULL;
createdEvent->definition_mixer = eventDefinition;
createdEvent->definition_engine = eventDefinition;
*event = createdEvent;
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;
}