public SimplePhraseMessenger(TextToSpeech speechEngine, string phrase, int numRepeats)
{
this.speechEngine = speechEngine;
this.phrase = phrase;
this.numRepeats = numRepeats;
AudioAttributes.Builder b = new AudioAttributes.Builder();
b.SetFlags(AudioFlags.LowLatency);
b.SetUsage(AudioUsageKind.Alarm);
b.SetContentType(AudioContentType.Speech);
AudioAttributes audioAttributes = b.Build();
speechEngine.SetAudioAttributes(audioAttributes);
}
private AudioTrack GetAudioTrack()
{
ChannelOut channelOut = _channels == 2 ? ChannelOut.Stereo : ChannelOut.Mono;
Encoding encoding = Encoding.Pcm16bit;;
int bufferSize = AudioTrack.GetMinBufferSize(_sampleRate, channelOut, encoding) * 2;
AudioTrack audioTrack;
AudioAttributes.Builder attributesBuilder = new AudioAttributes.Builder()
.SetUsage(AudioUsageKind.Game);
AudioFormat format = new AudioFormat.Builder()
.SetEncoding(encoding)
.SetSampleRate(_sampleRate)
.SetChannelMask(channelOut)
.Build();
if (Build.VERSION.SdkInt < BuildVersionCodes.O)
{
attributesBuilder.SetFlags(AudioFlags.LowLatency);
}
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
AudioTrack.Builder trackBuilder = new AudioTrack.Builder()
.SetAudioFormat(format)
.SetAudioAttributes(attributesBuilder.Build())
.SetTransferMode(AudioTrackMode.Stream)
.SetBufferSizeInBytes(bufferSize);
trackBuilder.SetPerformanceMode(AudioTrackPerformanceMode.LowLatency);
audioTrack = trackBuilder.Build();
}
else
{
audioTrack = new AudioTrack(attributesBuilder.Build(),
format,
bufferSize,
AudioTrackMode.Stream,
AudioManager.AudioSessionIdGenerate);
}
return(audioTrack);
}
