android - 在android中合并两个或多个.wav文件

Question

首先，我必须告诉你，我是 android 新手。我想合并两个 .wav（音频文件）文件。我已经用谷歌搜索过，使用 javax 包很容易将它们组合起来，但它在 android 上不受支持。你能告诉我如何在android中做到这一点。你能建议我任何可以帮助的教程或图书馆吗？提前感谢

Answer 1

作为新手，用户只会从文件中读取字节并将其与第二个文件连接！

但它不是那样工作的。在组合两个文件时，你必须非常小心波形文件头。幸运的是，我已经准备好了片段，这将对你有所帮助。

干得好

private void CombineWaveFile(String file1, String file2) {
    FileInputStream in1 = null, in2 = null;
    FileOutputStream out = null;
    long totalAudioLen = 0;
    long totalDataLen = totalAudioLen + 36;
    long longSampleRate = RECORDER_SAMPLERATE;
    int channels = 2;
    long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8;

    byte[] data = new byte[bufferSize];

    try {
        in1 = new FileInputStream(file1);
        in2 = new FileInputStream(file2);

        out = new FileOutputStream(getFilename3());

        totalAudioLen = in1.getChannel().size() + in2.getChannel().size();
        totalDataLen = totalAudioLen + 36;

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

        while (in1.read(data) != -1) {

            out.write(data);

        }
        while (in2.read(data) != -1) {

            out.write(data);
        }

        out.close();
        in1.close();
        in2.close();

        Toast.makeText(this, "Done!!", Toast.LENGTH_LONG).show();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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';
    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';
    header[13] = 'm';
    header[14] = 't';
    header[15] = ' ';
    header[16] = 16;
    header[17] = 0;
    header[18] = 0;
    header[19] = 0;
    header[20] = 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);
    header[33] = 0;
    header[34] = RECORDER_BPP;
    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);
}