android 工作室更改 API<23 的音频播放速度

Question

我想播放需要完全控制播放速度的配乐。我在 android studio 中尝试了几种方法来执行此操作，但我面临以下问题：

我的API级别是19，所以我不能用MediaPlayer改变速度
SoundPool 应该播放短促的声音并在几秒钟的音乐播放后停止

我还能尝试什么？

Answer 1

像这样：

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));
    }
}

android 工作室更改 API<23 的音频播放速度

android studio changing playback speed of audio for API<23

java

audio

android

playback