Android-使用MIDI文件播放SoundFont [英] Android - Play SoundFont with MIDI file

问题描述

我有一个midi文件，并且我已使用以下代码在Android中使用MediaPlayer播放了该midi文件:

I have one midi file and I have played that midi file using MediaPlayer in android using the following code:

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

mMediaPlayer?.start()

它默认使用一种乐器(例如钢琴)演奏，现在我想添加soundfont(sf2/sf3)文件，以使用不同的乐器和混响效果演奏中音音符.

It default play with one instrument like piano, now I want to add soundfont (sf2/sf3) file to play the midi notes with different instrument and with reverberation effects.

请指导达到预期结果的方法.

Please guide a way to achieve expected result.

推荐答案

有两个库将用于使用SoundFont播放midi文件.

There are two libraries that will be used to play a midi file using SoundFont.

Midi驱动程序

只是用于在Android上播放MIDI音符的合成器.您可以将其与USB/蓝牙MIDI库一起使用来创建MIDI应用程序.

Just a synthesizer for playing MIDI note on Android. You can use it with USB/Bluetooth-MIDI library together to create your MIDI application.

支持SoundFont2文件.

SoundFont2 file is supported.

Android MIDI库

此库提供了读取，操作和写入MIDI文件的接口.支持回放"作为实时事件分发系统.该库不包括实际的音频播放或设备接口.

This library provides an interface to read, manipulate, and write MIDI files. "Playback" is supported as a real-time event dispatch system. This library does NOT include actual audio playback or device interfacing.

初始化SF2-SoundBank

SF2Soundbank sf = new SF2Soundbank(getAssets().open("test.sf2"));
        synth = new SoftSynthesizer();
        synth.open();
        synth.loadAllInstruments(sf);
        synth.getChannels()[0].programChange(0);
        synth.getChannels()[1].programChange(1);
        recv = synth.getReceiver();

播放midi文件中的Midi音符

MidiFile midiFile = new MidiFile(getAssets().open("test.mid"));

// Create a new MidiProcessor:
MidiProcessor processor = new MidiProcessor(midiFile);

// listen for all midi events:
processor.registerEventListener(new MidiEventListener() {
    @Override
    public void onStart(boolean fromBeginning) {

    }

    @Override
    public void onEvent(MidiEvent event, long ms) {

        if (event.getClass() == NoteOn.class) {

                NoteOn noteOn = ((NoteOn) event);

                try {
                    ShortMessage msg = new ShortMessage();
                    msg.setMessage(ShortMessage.NOTE_ON, channel, noteOn.getNoteValue(), noteOn.getVelocity());
                    recv.send(msg, ms);
                } catch (InvalidMidiDataException e) {
                    e.printStackTrace();
                }

            } else if (event.getClass() == NoteOff.class) {

                NoteOff noteOff = ((NoteOff) event);

                try {
                    ShortMessage msg = new ShortMessage();
                    msg.setMessage(ShortMessage.NOTE_ON, channel, noteOff.getNoteValue(), noteOff.getVelocity());
                    recv.send(msg, ms);
                } catch (InvalidMidiDataException e) {
                    e.printStackTrace();
                }

            }
    }

    @Override
    public void onStop(boolean finished) {

    }
}, MidiEvent.class);

// Start the processor:
processor.start();

可以定义SF频道

private int channel = 0;

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