Question

我正试着播放一分钟的声音。我可以这样做，但我这样做的方式会生成声音缓冲区1然后播放它，这花费了太多时间，有一个很大的延迟。所以现在我正在尝试在播放时生成声音缓冲区。所以不会有任何延迟。它播放时间为4秒然后停止，但我不能再次点击我的按钮了。所以即使我听不到任何声音，我认为代码仍在运行。

这是我的代码：

public void play()
    {   
        short[] buffer = new short[44100];
        track = new AudioTrack (Stream.Music, 44100, ChannelOut.Mono, Encoding.Pcm16bit, 5292000, AudioTrackMode.Static);
        track.SetPlaybackRate (44100);
        while (n2 < 5292000) {
            for (int n = 0; n < 44100; n++) {

                float temp1 = (float)( Amplitude * Math.Sin ((2 * Math.PI * Frequency * n2) / 44100D));
                byte[] bytes = BitConverter.GetBytes (temp1);
                buffer [n] = (short)(temp1 * short.MaxValue);
                n2++;
            }
            int buffer_number = track.Write (buffer, 0, buffer.Length);
            track.Play();
        }

        track.Release();
    }

我尝试使用AudioTrackMode Stream 但是当程序到达Track.play时会抛出一个运行时错误： play（）调用未初始化的AudioTrack。

所以我做错了什么？

Answer 1

以下是基于android示例在c＃中使用c＃的简要版本：

http://marblemice.blogspot.fr/2010/04/generate-and-play-tone-in-android.html

public void playSound()
        {   
            var duration = 1;
            var sampleRate = 8000;
            var numSamples = duration * sampleRate;
            var sample = new double[numSamples];
            var freqOfTone = 1900;
            byte[] generatedSnd = new byte[2 * numSamples];

            for (int i = 0; i < numSamples; ++i) {
                sample[i] = Math.Sin(2 * Math.PI * i / (sampleRate/freqOfTone));
            }

            int idx = 0;
            foreach (double dVal in sample) {
                short val = (short) (dVal * 32767);
                generatedSnd[idx++] = (byte) (val & 0x00ff);
                generatedSnd[idx++] = (byte) ((val & 0xff00) >> 8);
            }

            var track = new AudioTrack (global::Android.Media.Stream.Music, sampleRate, ChannelOut.Mono, Encoding.Pcm16bit, numSamples, AudioTrackMode.Static);
            track.Write(generatedSnd, 0, numSamples);
            track.Play ();
        }

根据您的需要调整duration和`freqOfTone`。

Xamarin：播放声音一分钟

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