Dart

IBM Cloud - Text to Speech - Synthesize Audio (GET)

See more IBM Text to Speech Examples

Synthesizes text to audio that is spoken in the specified voice. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final http = CkHttp();

  http.login = 'apikey';
  http.password = 'my_apikey';
  http.basicAuth = true;

  // Use your base URL shown in the credentials web page (below your apikey)
  final myBaseUrl = 'https://api.us-south.text-to-speech.watson.cloud.ibm.com/instances/31941e96-7b89-4d56-8993-9cd8f18ec2d8';

  final sbUrl = CkStringBuilder();
  sbUrl.append(myBaseUrl);
  sbUrl.append('/v1/synthesize?accept=ACCEPT_TYPE&voice=CHOSEN_VOICE&text=TEXT_TO_SYNTHESIZE');

  // Choose "audio/wav" for the output file type.
  var numReplaced = sbUrl.replace('ACCEPT_TYPE', http.urlEncode('audio/wav'));
  // See the choices for voices at https://cloud.ibm.com/apidocs/text-to-speech#synthesize-audio-get
  numReplaced = sbUrl.replace('CHOSEN_VOICE', 'en-US_MichaelVoice');
  final textToSynthesize = 'When life gives you lemons, order the lobster tail.';
  numReplaced = sbUrl.replace('TEXT_TO_SYNTHESIZE', http.urlEncode(textToSynthesize));

  // Send the GET to synthesize the voice.
  // The response file will be contained in bdResponseBody
  final bdResponseBody = CkBinData();
  try {
    http.quickGetBd(sbUrl.getAsString(), bdResponseBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final respStatusCode = http.lastStatus;
  print('response status code = $respStatusCode');

  if (respStatusCode == 200) {
    bdResponseBody.writeFile('qa_output/lobster.wav');
    print('Success!');
  } else {
    print(bdResponseBody.getString('utf-8'));
  }
}