Android-使用MIDI文件播放SoundFont

Question

我有一个Midi文件，我已经使用以下代码在Android中使用MediaPlayer播放了该Midi文件：

val mMediaPlayer = MediaPlayer.create(context, R.raw.test_ring_1)

mMediaPlayer?.start()

它默认使用一种乐器（如钢琴）来演奏，现在我想添加soundfont（sf2 / sf3）文件来使用不同的乐器和混响效果来演奏Midi音符。

请指导达到预期结果的方法。

Answer 1

我已经测试过它有效

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    try {
        SF2Soundbank sf = new SF2Soundbank(getAssets().open("SmallTimGM6mb.sf2"));
        synth = new SoftSynthesizer();
        synth.open();
        synth.loadAllInstruments(sf);
        synth.getChannels()[0].programChange(0);
        synth.getChannels()[1].programChange(1);
        recv = synth.getReceiver();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (MidiUnavailableException e) {
        e.printStackTrace();
    }


    this.findViewById(R.id.piano).setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int action = MotionEventCompat.getActionMasked(event);
            if (action == MotionEvent.ACTION_DOWN) {
                try {
                    ShortMessage msg = new ShortMessage();
                    msg.setMessage(ShortMessage.NOTE_ON, 0, 60, 127);
                    recv.send(msg, -1);
                } catch (InvalidMidiDataException e) {
                    e.printStackTrace();
                }
            } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
                try {
                    ShortMessage msg = new ShortMessage();
                    msg.setMessage(ShortMessage.NOTE_OFF, 0, 60, 127);
                    recv.send(msg, -1);
                } catch (InvalidMidiDataException e) {
                    e.printStackTrace();
                }
            }
            return true;
        }
    });

    this.findViewById(R.id.woodblock).setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int action = MotionEventCompat.getActionMasked(event);
            if (action == MotionEvent.ACTION_DOWN) {
                try {
                    ShortMessage msg = new ShortMessage();
                    msg.setMessage(ShortMessage.NOTE_ON, 1, 60, 127);
                    recv.send(msg, -1);
                } catch (InvalidMidiDataException e) {
                    e.printStackTrace();
                }
            } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
                try {
                    ShortMessage msg = new ShortMessage();
                    msg.setMessage(ShortMessage.NOTE_OFF, 1, 60, 127);
                    recv.send(msg, -1);
                } catch (InvalidMidiDataException e) {
                    e.printStackTrace();
                }
            }
            return true;
        }
    });
}

不要忘记包含下面存储库中的 sherlockmidi 库，示例也可以在下面的存储库中找到。

https://github.com/agangzz/SherlockMidi