如何使用MediaPlayer同时播放多首曲目？

Question

我有8个mp3文件.而且我必须同时播放(不是很接近.肯定会).
我正在使用' AudaCity '来控制精度.但是我的代码没有给我想要的结果......
(异步= 30~90 ms)
所以,这是我的代码:(
首次开始播放)

public void start() {
//songInfo.getMediaPlayer() - it's array of MediaPlayers, source already setted
        for (MediaPlayer player : songInfo.getMediaPlayer()) {
            try {
                if (player != null) {
                    player.prepare();
                    player.seekTo(0);
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }       
        }
        songInfo.getMediaPlayer()[0]
                .setOnCompletionListener(new OnCompletionListener() {
                        @Override
                        public void onCompletion(MediaPlayer mp) {
                            //code for play next setlist
                        }
        });
        resume();
}

(暂停)

public void pause() {
        for (MediaPlayer player : songInfo.getMediaPlayer()) {
            if (player != null)
                player.pause();
        }
}

(暂停后恢复,开始播放(第一种方法))

public void resume() {  
        int pos = songInfo.getMediaPlayer()[0].getCurrentPosition();
        long iTime = System.currentTimeMillis();
        for (MediaPlayer player : songInfo.getMediaPlayer()) {
            if (player != null) {
                player.seekTo(pos + (int)(System.currentTimeMillis()-iTime));
                player.start();
            }
        }
}

如果我在第一次开始播放它会给我异步~30ms +
然后在暂停/恢复后它会完美播放.

Answer 1

经过大量研究,问题得到了解决.要同时播放多个轨道,您应该使用AsyncTask并在THREAD_POOL_EXECUTOR上执行它.
怎么做:
线程类:

class PlayThread extends AsyncTask<MediaPlayer, Void, Void>
{
    @Override
    protected Void doInBackground(MediaPlayer... player) {

        player[0].start();          
        return null;
    }
}

媒体播放器:

MediaPlayer[] players = new MediaPlayer[5];
//Then set source to each player...
//...
//Create objects of Thread class
PlayThread[] playThreads = new PlayThread[5];
for (int i = 0; i < 5; i++)
    playThreads[i] = new PlayThread();
//Set Media Players there and start play
for (int i = 0; i < 5; i++)
    playThreads[i].executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, players[i]);

AsyncTask只能同时执行5个线程,其他的将进入队列.

SoundPool缓冲区限制为1Mb,因此根本不是解决方案.

非常重要:
要同时播放更多音频曲目,您应将它们混合到1个缓冲区中.
执行此操作的方法:将mp3解码为pcm(以流模式转换为小缓冲区),将其混合到一个字节缓冲区中并将其放入AudioTrack进行播放.