public SynthesisServer(string subscription, string region, string voiceName, SpeechSynthesisOutputFormat outputFormat, int concurrency)
{
this.speechConfig = SpeechConfig.FromSubscription(subscription, region);
// set your voice name
speechConfig.SpeechSynthesisVoiceName = voiceName;
// use mp3 format to reduce network transfer payload
speechConfig.SetSpeechSynthesisOutputFormat(outputFormat);
// pool should be a single instance to handle all request. In real scenario, this could be put as a static class member
pool = new SynthesizerPool(() => new SpeechSynthesizer(speechConfig, null), concurrency);
latencyList = new List <double>();
processingTimeList = new List <double>();
}
public static void SpeechSynthesizeWithPool()
{
var speechConfig = SpeechConfig.FromSubscription(subscriptionKey, region);
var pool = new SynthesizerPool(() => new SpeechSynthesizer(speechConfig, null));
var latencyList = new List <double>();
var processingTimeList = new List <double>();
for (var turn = 0; turn < 3; turn++)
{
Console.WriteLine("turn: {0}", turn);
Parallel.For(0, 64, (i) =>
{
var start = DateTime.Now;
var synthesizer = pool.Get();
bool first = true;
void SynthesizingEvent(object sender, SpeechSynthesisEventArgs eventArgs)
{
// receive streaming audio here.
if (!first)
{
return;
}
Console.WriteLine("First byte latency: {0}", DateTime.Now - start);
first = false;
if (turn > 0)
{
latencyList.Add((DateTime.Now - start).TotalMilliseconds);
}
}
synthesizer.Synthesizing += SynthesizingEvent;
var result = synthesizer.SpeakTextAsync($"today is a nice day. {turn}{i}").Result;
if (result.Reason == ResultReason.SynthesizingAudioCompleted)
{
if (turn > 0)
{
processingTimeList.Add((DateTime.Now - start).TotalMilliseconds);
}
synthesizer.Synthesizing -= SynthesizingEvent;
pool.Put(synthesizer);
}
else
{
var err = SpeechSynthesisCancellationDetails.FromResult(result);
Console.WriteLine(err.ToString());
synthesizer.Dispose();
}
});
Thread.Sleep(2000);
}
latencyList.Sort();
Console.WriteLine("Average latency {0} ms", latencyList.Average());
Console.WriteLine("Max latency {0} ms", latencyList.Max());
Console.WriteLine("Min latency {0} ms", latencyList.Min());
Console.WriteLine("90% latency {0} ms", latencyList[Convert.ToInt32(latencyList.Count * 0.9)]);
Console.WriteLine("95% latency {0} ms", latencyList[Convert.ToInt32(latencyList.Count * 0.95)]);
processingTimeList.Sort();
Console.WriteLine("\nAverage processing time {0} ms", processingTimeList.Average());
Console.WriteLine("Max processing time {0} ms", processingTimeList.Max());
Console.WriteLine("Min processing time {0} ms", processingTimeList.Min());
Console.WriteLine("90% processing time {0} ms", processingTimeList[Convert.ToInt32(processingTimeList.Count * 0.9)]);
Console.WriteLine("95% processing time {0} ms", processingTimeList[Convert.ToInt32(processingTimeList.Count * 0.95)]);
Console.WriteLine("Press the Enter key to exit.");
Console.ReadLine();
}