在Flite引擎中实现audioPlayerDidFinishPlaying:成功

Question

我在我的项目stated here中使用了Flite text to speech引擎。我正在从json url中获取值，并将它们转换为语音。但是，我想知道如何实现audioPlayerDidFinishPlaying:successfully: delegate方法，并在Flitetts文件中调用它时播放下一个块。音频播放器必须一个接一个地播放对象，在播放完第一个值之后，它必须获取下一个值并将其转换为语音。相应的图像等也必须加载...

这是我到目前为止所做的代码。

  SBJSON *json = [[SBJSON alloc]init];
fliteEngine = [[FliteTTS alloc] init];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.sampleurl.txt"]];
NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *jsonstring = [[NSString alloc]initWithData:response encoding:NSUTF8StringEncoding];

NSArray *asanasList = [json objectWithString:jsonstring error:nil];
NSArray *asanas =[asanasList objectForKey:@"yogagurubackpain"];


for(NSDictionary *test in asanas)
{

    UrlValues *myasanas = [[UrlValues alloc]init];
    myasanas.asanatitle = [test objectForKey:@"asanatitle"];
    myasanas.asanatranscript = [test objectForKey:@"asanatranscript"];
    myasanas.asanapicture = [test objectForKey:@"asanapicture"];
    [data.yoga addObject:myasanas];
    [myasanas release];
}


UrlValues *asana=[[data yoga]objectAtIndex:0];
self.AsanaName.text = [asana asanatitle];
self.AsanaTranscript.text = [asana asanatranscript];

NSString *imageUrl = [asana asanapicture];
NSString* mapUrl = [imageUrl stringByReplacingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
NSData* imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:mapUrl]];
UIImage* image = [[UIImage alloc] initWithData:imageData];
self.AsanaImage.image = image;


NSString *speak = self.AsanaTranscript.text;
[fliteEngine setVoice:@"cmu_us_rms"];
[fliteEngine speakText:speak];
[fliteEngine setPitch:100.0 variance:11.0 speed:0.4];
    [imageData release];
    [image release];

[jsonstring release];
[json release];

请帮助我一些示例代码或教程，以便我可以完成任务…

Answer 1

只有在文本到语音转换引擎使用AVAudioPlayer对象播放声音时，才能调用audioPlayerDidFinishPlaying委托方法。如果不是，那么显然委托方法将不会被调用。相反，您必须禁用它，使其无法直接播放声音，并使用AVAudioPlayer对象。

这里有一个这样的例子：

http://artofsystems.blogspot.com/2009/02/speech-synthesis-on-iphone-with-flite.html