android - Android AudioRecord原始日期为.wav或其他格式

Question

我想创建.wav文件，以便以后可以根据需要播放，但AudioRecord(我需要使用AudioRecord)仅向我发送原始格式的数据。因此，我尝试像其他建议的答案一样在文件中添加.wav header ，但我似乎无法使其正常工作，我在做什么错？

这是我的方法，以.raw扩展名保存临时文件:

 private void onWriteAudioDataToFile(int index, short[] sData) {
    String filename = getFilename(index, false);
    FileOutputStream os;
    try {
        os = new FileOutputStream(filename);
        byte bData[] = short2byte(sData);
        os.write(bData);
    } catch (Exception e) {
        e.printStackTrace();
    }
    copyWaveFile(getFilename(index, false), getFilename(index, true));
}

这是读取文件并通过添加标题将其转换为.wav格式的方法:

private void copyWaveFile(String inFilename, String outFilename) {
    int channels = 2;
    long byteRate = 16 * 44100 * channels / 8;
    long longSampleRate = 44100;

    FileInputStream in;
    FileOutputStream out;
    long totalAudioLen;
    long totalDataLen;

    byte[] data = new byte[bufferSize];

    try {
        in = new FileInputStream(inFilename);
        out = new FileOutputStream(outFilename);
        totalAudioLen = in.getChannel().size();
        totalDataLen = totalAudioLen + 36;

        WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
                longSampleRate, channels, byteRate);

        while (in.read(data) != -1) {
            out.write(data);
        }

        in.close();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

最后，如有必要，这是添加 header 的方法:

private void WriteWaveFileHeader(
        FileOutputStream out, long totalAudioLen,
        long totalDataLen, long longSampleRate, int channels,
        long byteRate) throws IOException {
    byte[] header = new byte[44];

    header[0] = 'R';  // RIFF/WAVE header
    header[1] = 'I';
    header[2] = 'F';
    header[3] = 'F';
    header[4] = (byte) (totalDataLen & 0xff);
    header[5] = (byte) ((totalDataLen >> 8) & 0xff);
    header[6] = (byte) ((totalDataLen >> 16) & 0xff);
    header[7] = (byte) ((totalDataLen >> 24) & 0xff);
    header[8] = 'W';
    header[9] = 'A';
    header[10] = 'V';
    header[11] = 'E';
    header[12] = 'f';  // 'fmt ' chunk
    header[13] = 'm';
    header[14] = 't';
    header[15] = ' ';
    header[16] = 16;  // 4 bytes: size of 'fmt ' chunk
    header[17] = 0;
    header[18] = 0;
    header[19] = 0;
    header[20] = 1;  // format = 1
    header[21] = 0;
    header[22] = (byte) channels;
    header[23] = 0;
    header[24] = (byte) (longSampleRate & 0xff);
    header[25] = (byte) ((longSampleRate >> 8) & 0xff);
    header[26] = (byte) ((longSampleRate >> 16) & 0xff);
    header[27] = (byte) ((longSampleRate >> 24) & 0xff);
    header[28] = (byte) (byteRate & 0xff);
    header[29] = (byte) ((byteRate >> 8) & 0xff);
    header[30] = (byte) ((byteRate >> 16) & 0xff);
    header[31] = (byte) ((byteRate >> 24) & 0xff);
    header[32] = (byte) (2 * 16 / 8);  // block align
    header[33] = 0;
    header[34] = 16;  // bits per sample
    header[35] = 0;
    header[36] = 'd';
    header[37] = 'a';
    header[38] = 't';
    header[39] = 'a';
    header[40] = (byte) (totalAudioLen & 0xff);
    header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
    header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
    header[43] = (byte) ((totalAudioLen >> 24) & 0xff);

    out.write(header, 0, 44);
}

Answer 1

最常见的波形格式是PCM。 android.media.AudioRecord支持PCM输出。然后，您只需要将此内容写入文件即可。
取自how to record .wav format file in android