java - 从 wav 文件播放原始 PCM 字节

Question

我有一个用 16 位 PCM 编码的 wav 文件，我想将它转换为 PCM 短数组并使用音轨类播放原始数组。这就是我所做的:

        String fileName = "test.wav";
        File f = new File(baseDir + File.separator + fileName);
        InputStream is = null;
        try {
            is = new FileInputStream       (f);
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
            BufferedInputStream     bis = new BufferedInputStream   (is, 8000);
            DataInputStream         dis = new DataInputStream       (bis);      //  Create a DataInputStream to read the audio data from the saved file
            short[] music = new short[(int) f.length()];
            int i = 0;                                                          //  Read the file into the "music" array
            try {
                while (dis.available() > 0)
                {
                    music[i] = dis.readShort();                                      //  This assignment does not reverse the order
                    i++;
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            Log.i("123",""+Arrays.toString(music));

            try {
                dis.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }        

            at=new AudioTrack(AudioManager.STREAM_MUSIC, 8000, AudioFormat.CHANNEL_OUT_MONO,
                    AudioFormat.ENCODING_PCM_16BIT, 8000 /* 1 second buffer */,
                    AudioTrack.MODE_STREAM);
            at.write(music, 0, (int)f.length());
            at.play();

数组可以播放，但问题是我和播放原始wav文件比较时，发现它们输出的声音不一样。有人可以帮我解决这个问题吗？提前致谢!

Answer 1

您必须查找文件中的实际音频数据才能获取音频样本，请参阅 http://en.wikipedia.org/wiki/WAV或 https://ccrma.stanford.edu/courses/422/projects/WaveFormat/ .

16 位单声道 @ 8khz 的一秒将是 8000 * 2 * 1 字节 = 16000 字节