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When no input device, create dummy input to generate callbacks

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This commit is contained in:
Ken Cooke 2017-08-09 14:01:17 -07:00
parent 153b5cb065
commit 6f2cc9cfeb
2 changed files with 23 additions and 0 deletions
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22
libraries/audio-client/src/AudioClient.cpp
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@ -160,6 +160,7 @@ AudioClient::AudioClient() :
AbstractAudioInterface(),
_gate(this),
_audioInput(NULL),
_dummyAudioInput(NULL),
_desiredInputFormat(),
_inputFormat(),
_numInputCallbackBytes(0),
@ -1423,11 +1424,19 @@ bool AudioClient::switchInputToAudioDevice(const QAudioDeviceInfo& inputDeviceIn
_inputDeviceInfo = QAudioDeviceInfo();
}
if (_dummyAudioInput) {
_dummyAudioInput->stop();
_dummyAudioInput->deleteLater();
_dummyAudioInput = NULL;
}
if (_inputToNetworkResampler) {
// if we were using an input to network resampler, delete it here
delete _inputToNetworkResampler;
_inputToNetworkResampler = NULL;
}
if (_audioGate) {
delete _audioGate;
_audioGate = nullptr;
@ -1485,6 +1494,19 @@ bool AudioClient::switchInputToAudioDevice(const QAudioDeviceInfo& inputDeviceIn
}
}
// If there is no input device, use the dummy input device.
// It generates audio callbacks on a timer to simulate a mic stream of silent packets.
// This enables clients without a mic to still receive an audio stream from the mixer.
if (!_audioInput) {
qCDebug(audioclient) << "No audio input device is available, using dummy input.";
QTimer* _dummyAudioInput = new QTimer(this);
//connect(_dummyAudioInput, &QTimer::timeout, this, SLOT(handleDummyAudioInput()));
// generate audio callbacks at the network sample rate
_dummyAudioInput->start((int)(AudioConstants::NETWORK_FRAME_MSECS + 0.5f));
}
return supportedFormat;
}

1
libraries/audio-client/src/AudioClient.h
View file

@ -277,6 +277,7 @@ private:
Mutex _injectorsMutex;
QAudioInput* _audioInput;
QTimer* _dummyAudioInput;
QAudioFormat _desiredInputFormat;
QAudioFormat _inputFormat;
QIODevice* _inputDevice;