public async Task SpeakAsync(string text, int max, SpeechOptions options, CancellationToken cancelToken)
{
await Initialize();
// Wait for any previous calls to finish up
if (tcsUtterances?.Task != null)
{
await tcsUtterances.Task;
}
tcsUtterances = new TaskCompletionSource <bool>();
if (cancelToken != null)
{
cancelToken.Register(() =>
{
try
{
tts?.Stop();
tcsUtterances?.TrySetResult(true);
}
catch
{
}
});
}
if (options?.Locale?.Language != null)
{
JavaLocale locale = null;
if (!string.IsNullOrWhiteSpace(options?.Locale.Country))
{
locale = new JavaLocale(options.Locale.Language, options.Locale.Country);
}
else
{
locale = new JavaLocale(options.Locale.Language);
}
tts.SetLanguage(locale);
}
else
{
SetDefaultLanguage();
}
if (options?.Pitch.HasValue ?? false)
{
tts.SetPitch(options.Pitch.Value);
}
else
{
tts.SetPitch(TextToSpeech.PitchDefault);
}
tts.SetSpeechRate(1.0f);
var parts = text.SplitSpeak(max);
numExpectedUtterances = parts.Count;
var guid = Guid.NewGuid().ToString();
for (var i = 0; i < parts.Count && !cancelToken.IsCancellationRequested; i++)
{
// We require the utterance id to be set if we want the completed listener to fire
var map = new Dictionary <string, string>
{
{ AndroidTextToSpeech.Engine.KeyParamUtteranceId, $"{guid}.{i}" }
};
if (options != null && options.Volume.HasValue)
{
map.Add(AndroidTextToSpeech.Engine.KeyParamVolume, options.Volume.Value.ToString(CultureInfo.InvariantCulture));
}
// We use an obsolete overload here so it works on older API levels at runtime
// Flush on first entry and add (to not flush our own previous) subsequent entries
#pragma warning disable CS0618
tts.Speak(parts[i], i == 0 ? QueueMode.Flush : QueueMode.Add, map);
#pragma warning restore CS0618
}
await tcsUtterances.Task;
}
internal static Task PlatformSpeakAsync(string text, SpeechOptions options, CancellationToken cancelToken = default) => throw new System.PlatformNotSupportedException();
internal static Task PlatformSpeakAsync(string text, SpeechOptions options, CancellationToken cancelToken = default)
{
var speechUtterance = GetSpeechUtterance(text, options);
return(SpeakUtterance(speechUtterance, cancelToken));
}
static string GetSpeakParametersSSMLProsody(SpeechSynthesizer synthesizer, string text, SpeechOptions options)
{
var volume = "default";
var pitch = "default";
var rate = "default";
// Look for the specified language, otherwise the default voice
var locale = options?.Locale?.Language ?? synthesizer.Voice.Culture.Name;
if (options?.Volume.HasValue ?? false)
{
volume = (options.Volume.Value * 100f).ToString(CultureInfo.InvariantCulture);
}
if (options?.Pitch.HasValue ?? false)
{
pitch = ProsodyPitch(options.Pitch);
}
// SSML generation
var ssml = new StringBuilder();
ssml.AppendLine($"<speak version='1.0' xmlns='http://www.w3.org/2001/10/synthesis' xml:lang='{locale}'>");
ssml.AppendLine($"<prosody pitch='{pitch}' rate='{rate}' volume='{volume}'>{text}</prosody> ");
ssml.AppendLine($"</speak>");
return(ssml.ToString());
}
internal static Task PlatformSpeakAsync(string text, SpeechOptions options, CancellationToken cancelToken = default) => throw ExceptionUtils.NotSupportedOrImplementedException;
internal static Task PlatformSpeakAsync(string text, SpeechOptions options, CancellationToken cancelToken = default) => throw new NotImplementedInReferenceAssemblyException();
