Question

奇怪的情况。我使用AudioTrack但没有播放声音.... 我的游戏代码：

private class wPlaySound extends Thread {
    @Override
    public void run() {
        float sampleRate = 8000;
        int sampleSizeInBytes = 2;
        int samplePerFrame = (int) sampleRate / (1000 / 20); // 20мс
        int frameSize = sampleSizeInBytes * samplePerFrame;
        int minBuf = AudioTrack.getMinBufferSize(8000, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);

        Log.v("w201", "Buffer Size: " + minBuf);

        AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 8000, AudioFormat.CHANNEL_OUT_MONO,
                AudioFormat.ENCODING_PCM_16BIT, minBuf * 100, AudioTrack.MODE_STREAM);
        at.setStereoVolume(1.0f,1.0f);
        at.play();
        for (int i = 0; i < position; i = i + frameSize) {
            Log.v("w201","write: "+at.write(data, i, frameSize));
        }
        at.flush();
        at.stop();
        at.release();
    }
}

我能听懂是否听到噪音或声音不正确。但我什么也没听到......

编辑：我是如何得到数据的。它并不完美，不适用于所有设备，但它可以在我的手机和平板电脑上运行

private class wRecordSound extends Thread {
    public boolean stop = false;

    public wRecordSound() {
        position = 0;
    }

    @Override
    public void run() {

        int freq = 8000;
        int sampleSizeInBytes = 2;
        int samplePerFrame = (int) freq / (1000 / 20); // 20мс
        int frameSize = sampleSizeInBytes * samplePerFrame;

        final int bufferSize = AudioRecord.getMinBufferSize(freq,
                AudioFormat.CHANNEL_IN_MONO,
                AudioFormat.ENCODING_PCM_16BIT);

        final AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.DEFAULT, freq,
                AudioFormat.CHANNEL_IN_MONO,
                AudioFormat.ENCODING_PCM_16BIT, bufferSize);
        if (audioRecord.getState()!=AudioRecord.STATE_INITIALIZED) {
            Log.v("w201","audio recorder not init" );
            return;
        }
        try {
            audioRecord.startRecording();
            while (!stop) {


                position += audioRecord.read(data, position, frameSize);

            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        audioRecord.stop();
        audioRecord.release();
    }
}

EDIT2：我发现只有在我调用AudioTrack的方法停止后才开始播放声音。但是，如果我需要播放每一帧，我该怎么做？

_loop_
_receive_frame_
at.play
at.write(_one frame_)
at.stop

Answer 1

以下代码：

at.play();
at.write(data, i, frameSize));
at.flush();
at.stop();
at.release();

将无法正确播放。仅将块写入，直到将数据写入缓冲区为止，直到完成播放为止。您需要删除“ flush”，无论如何不应在播放缓冲区中调用它。见下文：

at.play();
at.write(data, i, frameSize));
at.stop();
at.release();

这样，停止将完成播放。但是，如果您需要立即停止，则应该执行以下操作：

at.pause();
at.flush();

使用Audiotrack时没有声音

1 个答案: