private async Task Speak(string text, VoiceInfo voice)
{
Authentication authentication = new Authentication(SettingsHelper.Instance.SpeechApiKey, this.apiRegion);
string tokenString = await authentication.RetrieveNewTokenAsync();
string voiceUrl = string.Format(EndpointTemplate, this.apiRegion);
WebRequest webRequest = WebRequest.Create(voiceUrl);
webRequest.ContentType = SSMLContentType;
webRequest.Headers.Add(AudioOutputFormatName, AudioOutputFormatValue);
webRequest.Headers.Add("User-Agent", SSMLUserAgent);
webRequest.Headers["Authorization"] = "Bearer " + tokenString;
webRequest.Timeout = MaxTimeout;
webRequest.Method = "POST";
string ssml = string.Format(SSMLTemplate, voice.Locale, voice.Name, text);
byte[] btBodys = Encoding.UTF8.GetBytes(ssml);
webRequest.ContentLength = btBodys.Length;
webRequest.GetRequestStream().Write(btBodys, 0, btBodys.Length);
string uniqueName = Guid.NewGuid().ToString();
StorageFile audioFile = await this.cacheDataFolder.CreateFileAsync(uniqueName + ".wav");
WebResponse httpWebResponse = await webRequest.GetResponseAsync();
using (Stream stream = httpWebResponse.GetResponseStream())
{
using (var outputStream = await audioFile.OpenAsync(FileAccessMode.ReadWrite))
{
await stream.CopyToAsync(outputStream.AsStreamForWrite());
await outputStream.FlushAsync();
}
}
StorageFile metadataFile = await this.cacheDataFolder.CreateFileAsync(uniqueName + ".json");
var cachedResult = new CachedResult {
Text = text, VoiceId = voice.Id
};
using (var outoutStream = await metadataFile.OpenAsync(FileAccessMode.ReadWrite))
{
string json = JsonConvert.SerializeObject(cachedResult, Formatting.Indented);
StreamWriter writer = new StreamWriter(outoutStream.AsStreamForWrite());
await writer.WriteAsync(json);
writer.Close();
}
// Add result to cache list and play it
cachedResult.AudioFilePath = audioFile.Path;
cachedResult.MetadataFilePath = metadataFile.Path;
CachedResults.Insert(0, cachedResult);
PlayAudioFile(audioFile.Path);
}
private async Task DeleteCachedResult(CachedResult dataContext)
{
try
{
var audioFile = await StorageFile.GetFileFromPathAsync(dataContext.AudioFilePath);
await audioFile.DeleteAsync();
}
catch { }
try
{
var metadataFile = await StorageFile.GetFileFromPathAsync(dataContext.MetadataFilePath);
await metadataFile.DeleteAsync();
}
catch { }
CachedResults.Remove(dataContext);
}