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In order to support BlueTooth SCO headsets
1. Configure the sample rate overrides for recording and playback to values that are required by SCO:
| Code Block | ||
|---|---|---|
| ||
try {
Os.setenv("PHENIX_AUDIO_PLAYBACK_SAMPLE_RATE_OVERRIDE", "16000", true);
Os.setenv("PHENIX_AUDIO_RECORDING_SAMPLE_RATE_OVERRIDE", "8000", true);
} catch (ErrnoException e) {
// handle exception
} |
2. Enable SCO in the AudioManager (this example assumes the code is placed in your Application subclass):
| Code Block |
|---|
AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
// call at appropriate time - detection of BT on
audioManager.startBluetoothSco();
// call at appropriate time - detection of BT off
audioManager.stopBluetoothSco(); |
3. For both publishing and subscribing, make sure that audio echo cancellation is enabled in the respective options:
| Code Block |
|---|
// publishing
final UserMediaOptions mediaConstraints = new UserMediaOptions();
mediaConstraints.getAudioOptions().capabilityConstraints.put(
DeviceCapability.AUDIO_ECHO_CANCELATION_MODE,
singletonList(new DeviceConstraint(AudioEchoCancelationMode.ON)));
PublishOptions publishOptions = PCastExpressFactory.createPublishOptionsBuilder()
.withMediaConstraints(mediaConstraints)
// add any other options
.buildPublishOptions();
// subscribing
final RendererOptions rendererOptions = new RendererOptions();
rendererOptions.audioEchoCancelationMode = AudioEchoCancelationMode.ON;
JoinChannelOptionsBuilder joinChannelOptionsBuilder = ChannelExpressFactory
.createJoinChannelOptionsBuilder()
.withRendererOptions(rendererOptions)
// add any other options
.buildJoinChannelOptions() |
4. Note that only mono streams are supported by SCO.
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