Dart

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

See more IBM Text to Speech Examples

Synthesizes text to audio that is spoken in the specified voice. Uses a POST which allows for more text to be synthesized. 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;

  // Send the following request:

  // curl -X POST -u "apikey:{apikey}" 
  //    --header "Content-Type: application/json" 
  //    --header "Accept: audio/wav" 
  //    --data "{\"text\":\"When life gives you lemons, order the lobster tail.\"}" 
  //    --output lobster.wav "{url}/v1/synthesize?voice=en-US_AllisonV3Voice"

  // 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?voice=en-US_AllisonV3Voice');

  http.accept = 'audio/wav';

  final json = CkJsonObject();
  json.updateString('text', 'When life gives you lemons, order the lobster tail.');

  final url = sbUrl.getAsString();
  final resp = CkHttpResponse();
  try {
    http.httpJson('POST', url, json, 'application/json', resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final respStatusCode = resp.statusCode;
  print('response status code = $respStatusCode');

  if (respStatusCode == 200) {
    resp.saveBodyBinary('qa_output/lobster.wav');
    print('Success!');
  } else {
    print(resp.bodyStr);
  }
}