用google tts api发音

GoogleTTS.m

/*
q 要发音的中文或英文词语、句子
tl 发音语言
http://translate.google.com/translate_tts?ie=UTF-8&q=你好&tl=zh-CN&total=1&idx=0&textlen=11&prev=input
*/

NSString* userAgent = @"Mozilla/5.0";
NSURL *url = [NSURL URLWithString:[@"http://translate.google.com/translate_tts?ie=UTF-8&q=你好&tl=zh-CN&total=1&idx=0&textlen=11&prev=input"
  							   stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSMutableURLRequest* request = [[NSMutableURLRequest alloc] initWithURL:url];
[request setValue:userAgent forHTTPHeaderField:@"User-Agent"];
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
	NSError *playerError = nil;
	AVAudioPlayer * avPlayerObject = [[AVAudioPlayer alloc] initWithData:data error:&playerError];
	if(avPlayerObject)
	{
		NSLog(@"%f", avPlayerObject.duration);
		[avPlayerObject play];
	} else
	{
		NSLog(@"cant't play");
	}
}];

谢谢！有google tts 的文档吗？