从wav文件播放原始PCM字节 [英] play a raw PCM byte from a wav file

问题描述

我这是带16位PCM codeD wav文件，我想将其转换为PCM短阵并播放audiotrack类原料数组。这是我做过什么：

I have a wav file which was encoded with 16-bit PCM, I want to convert it to a PCM short array and play the raw array with audiotrack class. It is what I did:

        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();

该阵列可以播放，但问题是，当我摆弄原来的wav文件进行比较，我发现他们不输出相同的声音。有人可以帮我解决这个问题？谢谢你在前进！

The array can be played, but the problem is that when I compare it with playing the original wav file, I found that they don't output the same sound. Can someone help me with this issue? Thank you in advance!

推荐答案

您必须设法文件中的实际音频数据，以获得音频采样看到的 http://en.wikipedia.org/wiki/WAV 或的 https://ccrma​​.stanford.edu/courses/422/projects/WaveFor​​mat/ 。

You have to seek to the actual audio data in the file to get the audio sample see http://en.wikipedia.org/wiki/WAV or https://ccrma.stanford.edu/courses/422/projects/WaveFormat/.

16位单率8kHz的一秒将是8000 * 2 * 1字节= 16000字节

One second of 16bit mono @ 8khz will be 8000 * 2 * 1 bytes = 16000 bytes

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