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#include "AudioToolbox.h"
#include <glog/logging.h>
#import <Foundation/Foundation.h>
#import <Foundation/NSURL.h>
namespace uscxml {
AudioToolbox::AudioToolbox(const std::string filename) {
@autoreleasepool {
_afId = 0;
NSString* filePath = [NSString stringWithCString:filename.c_str() encoding:NSASCIIStringEncoding];
NSURL* afUrl = [NSURL fileURLWithPath:filePath];
OSStatus result = noErr;
result = ExtAudioFileOpenURL((CFURLRef)afUrl, &_afId);
if (result != noErr) {
LOG(WARNING) << "Cannot open audio file " << filename;
return;
}
UInt32 thePropertySize = sizeof(_inputFormat);
result = ExtAudioFileGetProperty(_afId, kExtAudioFileProperty_FileDataFormat, &thePropertySize, &_inputFormat);
if (result != noErr) {
LOG(WARNING) << "Cannot determine input format of " << filename;
return;
}
// output format is input format
memcpy(&_outputFormat, &_inputFormat, sizeof(_inputFormat));
// except for things that make no sense for open al
_outputFormat.mFormatID = kAudioFormatLinearPCM;
_outputFormat.mFormatFlags = kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked | kAudioFormatFlagIsSignedInteger;
ALenum bestFormat = formatToALEnum(_outputFormat);
alEnumToFormat(_outputFormat, bestFormat);
result = ExtAudioFileSetProperty(_afId, kExtAudioFileProperty_ClientDataFormat, sizeof(_outputFormat), &_outputFormat);
if (result != noErr) {
LOG(WARNING) << "Cannot set audio format file " << filename;
return;
}
}
}
AudioToolbox::~AudioToolbox() {
if (_afId)
ExtAudioFileDispose(_afId); //close the file
}
void AudioToolbox::seek(unsigned int pos) {
ExtAudioFileSeek(_afId, pos);
}
int AudioToolbox::read(char* buffer, unsigned int size) {
UInt32 read = size / _outputFormat.mBytesPerFrame;
OSStatus result = noErr;
SInt64 theFileLengthInFrames = 0;
UInt32 thePropertySize = sizeof(theFileLengthInFrames);
result = ExtAudioFileGetProperty(_afId, kExtAudioFileProperty_FileLengthFrames, &thePropertySize, &theFileLengthInFrames);
read = (theFileLengthInFrames < read ? theFileLengthInFrames : read);
AudioBufferList dataBuffer;
dataBuffer.mNumberBuffers = 1;
dataBuffer.mBuffers[0].mDataByteSize = size;
dataBuffer.mBuffers[0].mNumberChannels = _outputFormat.mChannelsPerFrame;
dataBuffer.mBuffers[0].mData = buffer;
result = ExtAudioFileRead(_afId, &read, &dataBuffer);
if (result != noErr) {
LOG(WARNING) << "Cannot read data";
return 0;
}
return read * _outputFormat.mBytesPerFrame;
}
ALenum AudioToolbox::formatToALEnum(AudioStreamBasicDescription asbd) {
if (asbd.mBitsPerChannel < 16) {
if (asbd.mChannelsPerFrame == 1) {
return AL_FORMAT_MONO8;
} else {
return AL_FORMAT_STEREO8;
}
} else {
if (asbd.mChannelsPerFrame == 1) {
return AL_FORMAT_MONO16;
} else {
return AL_FORMAT_STEREO16;
}
}
}
bool AudioToolbox::alEnumToFormat(AudioStreamBasicDescription& asbd, ALenum format) {
switch (format) {
case AL_FORMAT_MONO8:
asbd.mBitsPerChannel = 8;
asbd.mBytesPerFrame = 1;
asbd.mBytesPerPacket = 1;
asbd.mChannelsPerFrame = 1;
break;
case AL_FORMAT_MONO16:
asbd.mBitsPerChannel = 16;
asbd.mBytesPerFrame = 2;
asbd.mBytesPerPacket = 2;
asbd.mChannelsPerFrame = 1;
break;
case AL_FORMAT_STEREO8:
asbd.mBitsPerChannel = 8;
asbd.mBytesPerFrame = 2;
asbd.mBytesPerPacket = 2;
asbd.mChannelsPerFrame = 2;
break;
case AL_FORMAT_STEREO16:
asbd.mBitsPerChannel = 16;
asbd.mBytesPerFrame = 4;
asbd.mBytesPerPacket = 4;
asbd.mChannelsPerFrame = 2;
break;
default:
break;
}
return true;
}
void AudioToolbox::setOutFormat(const PCMFormat& format) {
alEnumToFormat(_outputFormat, format.alFormat);
_outputFormat.mSampleRate = format.sampleRate;
OSStatus result = ExtAudioFileSetProperty(_afId, kExtAudioFileProperty_ClientDataFormat, sizeof(_outputFormat), &_outputFormat);
if (result != noErr) {
LOG(WARNING) << "Cannot set audio format";
return;
}
}
PCMFormat AudioToolbox::getInFormat() {
PCMFormat format;
format.sampleRate = _inputFormat.mSampleRate;
format.alFormat = formatToALEnum(_inputFormat);
return format;
}
}
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