Android 利用AudioTrack播放 PCM 格式音频

偏执的太偏执、 2022-03-18 08:22 697阅读 0赞

class PCMPlayer extends Thread {
        protected AudioTrack mAudioTrack;
        protected int mMiniBufferSize;
        protected byte[] mBuffer;
    
        File file;
        FileInputStream in;
        /**
         * @param filePath 文件路径
         * @param fileName 文件名称
         * */
        public void init(String filePath , String fileName) {
            try {
                file = new File(filePath, fileName);
                in = new FileInputStream(file);
    
                /**
                 * 参数1：采样率    根据录音的采样率自定义
                 * 参数2：声道     {@link AudioFormat.CHANNEL_OUT_MONO}单声道  {@link AudioFormat.CHANNEL_OUT_STEREO} 双声道
                 * 参数3：比特率  {@link AudioFormat.ENCODING_PCM_16BIT} {@link AudioFormat.ENCODING_PCM_8BIT}
                 * */
                mMiniBufferSize = AudioTrack.getMinBufferSize(16000,
                        AudioFormat.CHANNEL_OUT_MONO, // CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT);
    
                mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, 16000,
                        AudioFormat.CHANNEL_OUT_MONO, // CHANNEL_CONFIGURATION_MONO,
                        AudioFormat.ENCODING_PCM_16BIT,
                        mMiniBufferSize,
                        AudioTrack.MODE_STREAM);
    
                mBuffer = new byte[mMiniBufferSize];
    
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        public void run() {
            mAudioTrack.play();
            int read = -1 ;
            try {
                while ((read = in.read(mBuffer)) != -1) {
                    try {
                        mAudioTrack.write(mBuffer, 0, read);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
    
            mAudioTrack.stop();
            mAudioTrack = null;
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

# **调用：** #

PCMPlayer player = new PCMPlayer() ;
    player.init( "/sdcard/" , "audio-record.wav");
    player.start();