Android(安卓)pcm文件播放方法(AudioTrack)

pcm文件不能直接使用MediaPlayer进行播放, 因为mediaplayer不支持这种格式的音频文件,

我们可以使用AudioTrack对录到的pcm文件进行播放, 使用AudioTrack的步骤如下:

1.获取一个合适的缓存区

int bufferSize = AudioTrack.getMinBufferSize(16000, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);

第一个参数是采样率这里我是用的是16000(另外还有8000等格式), 第二个参数是单声道还是多声道(这里我用的是单声道), 第三个表示录音数据的格式这里用的是PCM_16BIT

2.创建一个AudioTrack对象

 audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 16000, AudioFormat.CHANNEL_OUT_MONO,AudioFormat.ENCODING_PCM_16BIT, bufferSize, AudioTrack.MODE_STREAM);

3.调用play()方法, 并向audiotrack里写入录音数据:

try {audioTrack.play();fis = new FileInputStream(path);byte[] buffer = new byte[bufferSize];int len = 0;isPlaying = true;while ((len = fis.read(buffer)) != -1 && !isStop) {//                    Log.d(TAG, "playPCMRecord: len " + len);audioTrack.write(buffer, 0, len);}} catch (Exception e) {Log.e(TAG, "playPCMRecord: e : " + e);}

来看一个完整的写法:

private Runnable playPCMRecord = new Runnable() {        @Override        public void run() {            int bufferSize = AudioTrack.getMinBufferSize(16000, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);            audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 16000, AudioFormat.CHANNEL_OUT_MONO,AudioFormat.ENCODING_PCM_16BIT, bufferSize, AudioTrack.MODE_STREAM);            FileInputStream fis = null;            try {                audioTrack.play();                fis = new FileInputStream(path);                byte[] buffer = new byte[bufferSize];                int len = 0;                isPlaying = true;                while ((len = fis.read(buffer)) != -1 && !isStop) {//                    Log.d(TAG, "playPCMRecord: len " + len);                    audioTrack.write(buffer, 0, len);                }            } catch (Exception e) {                Log.e(TAG, "playPCMRecord: e : " + e);            } finally {                isPlaying = false;                isStop = false;                if (audioTrack != null) {                    audioTrack.stop();                    audioTrack = null;                }                if (fis != null) {                    try {                        fis.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        }    };

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