Question

我尝试使用以下代码使用Xamarin音频录制/播放示例： Example_WorkingWithAudio

在以下Task我有async错误：

protected async Task PlayAudioTrackAsync ()
{
    audioTrack = new AudioTrack (
        // Stream type
        Android.Media.Stream.Music,
        // Frequency
        11025,
        // Mono or stereo
        ChannelConfiguration.Mono,
        // Audio encoding
        Android.Media.Encoding.Pcm16bit,
        // Length of the audio clip.
        buffer.Length,
        // Mode. Stream or static.
        AudioTrackMode.Stream);

    audioTrack.Play ();

    await audioTrack.WriteAsync (buffer, 0, buffer.Length);
}

更改了dot42：

protected async Task PlayAudioTrackAsync()
{
    audioTrack = new AudioTrack (AudioManager.STREAM_MUSIC,11025,
                                 AudioFormat.CHANNEL_OUT_MONO,
                                 AudioFormat.ENCODING_PCM_16BIT,
                                 buffer.Length,
                                 AudioTrack.MODE_STREAM
                                 );
    audioTrack.Play ();
    await audioTrack.WriteAsync(buffer, 0, buffer.Length);
}

如何更改“audioTrack.WriteAsync”？我在这一行上有编译器错误。

Answer 1

AudioTrack没有WriteAsync。对于dot42，请使用以下行：

await Task.Factory.StartNew( () => audioTrack.Write(buffer, 0, buffer.Length) );

我认为这也适用于Xamarin。

Answer 2

除了那个答案，我还使用audioTrack.WriteAsync（）方法播放音频异步。我认为不需要创建一个异步方法。这就是异步播放音频的原因。

public void audioTrackPlay(byte[] audioBuffer){try {

     audioTrack.Play();
   //  audioTrack.Write(audioBuffer, 0, audioBuffer.Length);
    audioTrack.WriteAsync(audioBuffer, 0, audioBuffer.Length);

     Toast.MakeText(this,"Server Started",ToastLength.Short).Show();
   } catch (Exception e) { }   }

异步播放音轨

2 个答案: