android - 将字节数组转换为 mp3 文件

Question

我在 android 中编写了一个应用程序来记录来自麦克风的声音并将其存储在字节数组中使用

audioRecord.read(bigBuff, currSize, minBuffSize);

bigBuff 是一个字节数组，现在我想将这个字节数组转换为 .mp3 文件或 .wav 文件，我正在这样做

File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/aaa.wav");

f.createNewFile();
FileOutputStream fos = new FileOutputStream(f);
fos.write(bigBuff);
fos.flush();
fos.close();

aaa.wav 文件已成功创建，但当我尝试像任何其他 .wav 或 .mp3 文件一样从应用程序外部播放它时，它显示错误“抱歉播放器不支持这种类型的音频文件”

请帮忙。

Answer 1

我想你没有输入数据头。
添加此方法并在复制数据后。

        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] = RECORDER_BPP;  // 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);
    }