/// <summary>
/// Convert text to speech to an audio file then save it to a S3 bucket
/// </summary>
/// <param name="request"></param>
/// <returns></returns>
public async Task <ConvertTextResponse> AddTextToSpeechFileToBucket(ConvertTextRequest request)
{
if (string.IsNullOrEmpty(request.Content))
{
throw new ArgumentNullException("Content cannot be empty");
}
_logger.Info($"Content requested to convert: {request.Content}");
var pollyRequest = new SynthesizeSpeechRequest {
OutputFormat = OutputFormat.Mp3,
Text = request.Content,
TextType = "text",
VoiceId = VoiceId.Amy, // https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/Polly/TVoiceId.html
LanguageCode = LanguageCode.EnUS // https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/Polly/TLanguageCode.html
};
// Send request to Amazon Polly to convert text to audio.
var synthesizeSpeechResponse = await _pollyClient.SynthesizeSpeechAsync(pollyRequest);
if (synthesizeSpeechResponse == null ||
synthesizeSpeechResponse.HttpStatusCode != (HttpStatusCode)200)
{
throw new Exception("Text could not be converted to audio.");
}
_logger.Info($"Requested characters was: {synthesizeSpeechResponse.RequestCharacters}");
// Stream the audio from Amazon Polly to a S3 bucket using the filename provided by the request
PutObjectResponse s3Response;
using (var memoryStream = new MemoryStream()) {
synthesizeSpeechResponse.AudioStream.CopyTo(memoryStream);
s3Response = await _s3Client.PutObjectAsync(new PutObjectRequest {
BucketName = _s3BucketName,
Key = request.FileName,
InputStream = memoryStream
});
}
if (s3Response == null ||
s3Response.HttpStatusCode != (HttpStatusCode)200)
{
throw new Exception("Unable to save audio file to s3");
}
// Publish to a SNS topic that a new audio file has been saved.
var publishRequest = new PublishRequest {
TopicArn = _notificationSnsTopic,
Message = "An audio file was saved",
Subject = "New MP3 File"
};
await _snsClient.PublishAsync(publishRequest);
return(new ConvertTextResponse {
FileName = request.FileName
});
}
/// <summary> /// Incoming request from API Gateway that is redirect to a Logic class for text to audio conversion /// </summary> /// <see cref="Logic.AddTextToSpeechFileToBucket(ConvertTextRequest)">Forwards request to Logic class</see> public async Task <ConvertTextResponse> AddTextToSpeechFileToBucket(ConvertTextRequest request) => await _logic.AddTextToSpeechFileToBucket(request);
