/* |
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File: MyOpenALSupport.c |
Abstract: OpenAL-related support functions |
Version: 1.9 |
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*/ |
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#include "MyOpenALSupport.h" |
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ALvoid alBufferDataStaticProc(const ALint bid, ALenum format, ALvoid* data, ALsizei size, ALsizei freq) |
{ |
static alBufferDataStaticProcPtr proc = NULL; |
|
if (proc == NULL) { |
proc = (alBufferDataStaticProcPtr) alcGetProcAddress(NULL, (const ALCchar*) "alBufferDataStatic"); |
} |
|
if (proc) |
proc(bid, format, data, size, freq); |
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return; |
} |
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void* MyGetOpenALAudioData(CFURLRef inFileURL, ALsizei *outDataSize, ALenum *outDataFormat, ALsizei* outSampleRate) |
{ |
OSStatus err = noErr; |
SInt64 theFileLengthInFrames = 0; |
AudioStreamBasicDescription theFileFormat; |
UInt32 thePropertySize = sizeof(theFileFormat); |
ExtAudioFileRef extRef = NULL; |
void* theData = NULL; |
AudioStreamBasicDescription theOutputFormat; |
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// Open a file with ExtAudioFileOpen() |
err = ExtAudioFileOpenURL(inFileURL, &extRef); |
if(err) { printf("MyGetOpenALAudioData: ExtAudioFileOpenURL FAILED, Error = %ld\n", err); goto Exit; } |
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// Get the audio data format |
err = ExtAudioFileGetProperty(extRef, kExtAudioFileProperty_FileDataFormat, &thePropertySize, &theFileFormat); |
if(err) { printf("MyGetOpenALAudioData: ExtAudioFileGetProperty(kExtAudioFileProperty_FileDataFormat) FAILED, Error = %ld\n", err); goto Exit; } |
if (theFileFormat.mChannelsPerFrame > 2) { printf("MyGetOpenALAudioData - Unsupported Format, channel count is greater than stereo\n"); goto Exit;} |
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// Set the client format to 16 bit signed integer (native-endian) data |
// Maintain the channel count and sample rate of the original source format |
theOutputFormat.mSampleRate = theFileFormat.mSampleRate; |
theOutputFormat.mChannelsPerFrame = theFileFormat.mChannelsPerFrame; |
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theOutputFormat.mFormatID = kAudioFormatLinearPCM; |
theOutputFormat.mBytesPerPacket = 2 * theOutputFormat.mChannelsPerFrame; |
theOutputFormat.mFramesPerPacket = 1; |
theOutputFormat.mBytesPerFrame = 2 * theOutputFormat.mChannelsPerFrame; |
theOutputFormat.mBitsPerChannel = 16; |
theOutputFormat.mFormatFlags = kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked | kAudioFormatFlagIsSignedInteger; |
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// Set the desired client (output) data format |
err = ExtAudioFileSetProperty(extRef, kExtAudioFileProperty_ClientDataFormat, sizeof(theOutputFormat), &theOutputFormat); |
if(err) { printf("MyGetOpenALAudioData: ExtAudioFileSetProperty(kExtAudioFileProperty_ClientDataFormat) FAILED, Error = %ld\n", err); goto Exit; } |
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// Get the total frame count |
thePropertySize = sizeof(theFileLengthInFrames); |
err = ExtAudioFileGetProperty(extRef, kExtAudioFileProperty_FileLengthFrames, &thePropertySize, &theFileLengthInFrames); |
if(err) { printf("MyGetOpenALAudioData: ExtAudioFileGetProperty(kExtAudioFileProperty_FileLengthFrames) FAILED, Error = %ld\n", err); goto Exit; } |
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// Read all the data into memory |
UInt32 dataSize = theFileLengthInFrames * theOutputFormat.mBytesPerFrame;; |
theData = malloc(dataSize); |
if (theData) |
{ |
AudioBufferList theDataBuffer; |
theDataBuffer.mNumberBuffers = 1; |
theDataBuffer.mBuffers[0].mDataByteSize = dataSize; |
theDataBuffer.mBuffers[0].mNumberChannels = theOutputFormat.mChannelsPerFrame; |
theDataBuffer.mBuffers[0].mData = theData; |
|
// Read the data into an AudioBufferList |
err = ExtAudioFileRead(extRef, (UInt32*)&theFileLengthInFrames, &theDataBuffer); |
if(err == noErr) |
{ |
// success |
*outDataSize = (ALsizei)dataSize; |
*outDataFormat = (theOutputFormat.mChannelsPerFrame > 1) ? AL_FORMAT_STEREO16 : AL_FORMAT_MONO16; |
*outSampleRate = (ALsizei)theOutputFormat.mSampleRate; |
} |
else |
{ |
// failure |
free (theData); |
theData = NULL; // make sure to return NULL |
printf("MyGetOpenALAudioData: ExtAudioFileRead FAILED, Error = %ld\n", err); goto Exit; |
} |
} |
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Exit: |
// Dispose the ExtAudioFileRef, it is no longer needed |
if (extRef) ExtAudioFileDispose(extRef); |
return theData; |
} |