String open (const BigInteger& inputChannels,
const BigInteger& outputChannels,
double sampleRate,
int bufferSize)
{
close();
lastError = String::empty;
preferredBufferSize = (bufferSize <= 0) ? getDefaultBufferSize() : bufferSize;
// xxx set up channel mapping
activeOutputChans = outputChannels;
activeOutputChans.setRange (2, activeOutputChans.getHighestBit(), false);
numOutputChannels = activeOutputChans.countNumberOfSetBits();
monoOutputChannelNumber = activeOutputChans.findNextSetBit (0);
activeInputChans = inputChannels;
activeInputChans.setRange (2, activeInputChans.getHighestBit(), false);
numInputChannels = activeInputChans.countNumberOfSetBits();
monoInputChannelNumber = activeInputChans.findNextSetBit (0);
AudioSessionSetActive (true);
UInt32 audioCategory = kAudioSessionCategory_MediaPlayback;
if (numInputChannels > 0 && audioInputIsAvailable)
{
audioCategory = kAudioSessionCategory_PlayAndRecord;
UInt32 allowBluetoothInput = 1;
AudioSessionSetProperty (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput,
sizeof (allowBluetoothInput), &allowBluetoothInput);
}
AudioSessionSetProperty (kAudioSessionProperty_AudioCategory, sizeof (audioCategory), &audioCategory);
AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange, routingChangedStatic, this);
fixAudioRouteIfSetToReceiver();
updateDeviceInfo();
Float32 bufferDuration = preferredBufferSize / sampleRate;
AudioSessionSetProperty (kAudioSessionProperty_PreferredHardwareIOBufferDuration, sizeof (bufferDuration), &bufferDuration);
actualBufferSize = preferredBufferSize;
prepareFloatBuffers();
isRunning = true;
routingChanged (nullptr); // creates and starts the AU
lastError = audioUnit != 0 ? "" : "Couldn't open the device";
return lastError;
}
String open (const BigInteger& inputChannelsWanted,
const BigInteger& outputChannelsWanted,
double targetSampleRate, int bufferSize) override
{
close();
lastError.clear();
preferredBufferSize = (bufferSize <= 0) ? getDefaultBufferSize() : bufferSize;
// xxx set up channel mapping
activeOutputChans = outputChannelsWanted;
activeOutputChans.setRange (2, activeOutputChans.getHighestBit(), false);
numOutputChannels = activeOutputChans.countNumberOfSetBits();
monoOutputChannelNumber = activeOutputChans.findNextSetBit (0);
activeInputChans = inputChannelsWanted;
activeInputChans.setRange (2, activeInputChans.getHighestBit(), false);
numInputChannels = activeInputChans.countNumberOfSetBits();
monoInputChannelNumber = activeInputChans.findNextSetBit (0);
AudioSessionSetActive (true);
if (numInputChannels > 0 && audioInputIsAvailable)
{
setSessionUInt32Property (kAudioSessionProperty_AudioCategory, kAudioSessionCategory_PlayAndRecord);
setSessionUInt32Property (kAudioSessionProperty_OverrideCategoryEnableBluetoothInput, 1);
}
else
{
setSessionUInt32Property (kAudioSessionProperty_AudioCategory, kAudioSessionCategory_MediaPlayback);
}
AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange, routingChangedStatic, this);
fixAudioRouteIfSetToReceiver();
updateDeviceInfo();
setSessionFloat64Property (kAudioSessionProperty_PreferredHardwareSampleRate, targetSampleRate);
updateSampleRates();
setSessionFloat64Property (kAudioSessionProperty_PreferredHardwareIOBufferDuration, preferredBufferSize / sampleRate);
updateCurrentBufferSize();
prepareFloatBuffers (actualBufferSize);
isRunning = true;
routingChanged (nullptr); // creates and starts the AU
lastError = audioUnit != 0 ? "" : "Couldn't open the device";
return lastError;
}
