android studio更改了API< 23的音频播放速度 [英] android studio changing playback speed of audio for API<23

问题描述

我想播放一个需要完全控制播放速度的配乐.我尝试了几种在android studio中执行此操作的方法，但遇到了以下问题:

I want to play a soundtrack where I need full control over the playback speed. I have tried several ways to do this in android studio, but I'm facing the following problems:

• 我的API级别是19，所以我无法使用MediaPlayer更改速度
• SoundPool应该会播放短声音，并在播放几秒钟的音乐后停止播放

我还能尝试什么?

推荐答案

类似以下内容:

public class AudioActivity extends Activity {
AudioTrack audio = new AudioTrack(AudioManager.STREAM_MUSIC,
        44100,
        AudioFormat.CHANNEL_OUT_STEREO,
        AudioFormat.ENCODING_PCM_16BIT,
        intSize, //size of pcm file to read in bytes
        AudioTrack.MODE_STATIC);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //read track from file
        File file = new File(getFilesDir(), fileName);

        int size = (int) file.length();
        byte[] data = new byte[size];

        try {
            FileInputStream fileInputStream = new FileInputStream(file);
            fileInputStream.read(data, 0, size);
            fileInputStream.close();

            audio.write(data, 0, data.length);
        } catch (IOException e) {}
    }

    //change playback speed by factor
    void changeSpeed(double factor) {
        audio.setPlaybackRate((int) (audio.getPlaybackRate() * factor));
    }
}

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