java - 在 Android 上合并两个 WAVE 文件(连接)

Question

我已经尝试在 Android 上合并两个 WAVE 文件很长一段时间了，但似乎真的无法让它正常工作。

一切看起来都很好，文件被读取并写入输出文件，该文件在稍后阶段也是可读的，并且具有我希望看到的文件大小。

应用程序完成合并后立即出现问题。此消息将显示在日志中:error occurred in updateListener, recording is aborted 这是来自 extAudioRecorder 的消息并在 OnRecordPositionUpdateListener 到达 catch 子句时出现(异常具有以下 detailMessage:写入失败:EBADF(错误文件编号))。这似乎没有破坏任何东西，所以我不太担心这一点。

当我尝试创建一个 MediaPlayer 时真正的问题出现了并调用setDataSource(String path)在 MediaPlayer 实例上。每当我对合并文件执行此操作时，日志中都会显示以下错误消息:无法创建媒体播放器(抛出的 IOException 包含以下 detailMessage:< strong>setDataSourceFD 失败。: status=0x80000000)。请注意，文件第一次可以完美播放(第一个文件不是由 combineWaveFiles() 方法制作的)。该错误消息似乎表明音频文件的格式不正确和/或 MediaPlayer 无法读取。

我的问题是，是否有人发现下面的代码有任何真正的问题(我知道它在很多方面都不是最优的，但我更愿意先让它工作，然后再担心性能)。

public static String MergeRecordings(String cumulativeFile, String recordFile, int sampleRate, int bpp, int bufferSize, int channels) {
    if (cumulativeFile == null) {
        return recordFile;
    } else if (recordFile == null) {
        return cumulativeFile;
    }

    String outputFile = FileUtils.getFilePath(null, MDSettings.shared().getMainActivity());
    FileUtils.combineWaveFiles(cumulativeFile, recordFile, outputFile, sampleRate, bpp, bufferSize, channels);

    //FileUtils.removeFile(cumulativeFile);
    //FileUtils.removeFile(recordFile);

    return outputFile;
}

//creates a new file containing file1 + file2 stuck together as such.
private static void combineWaveFiles(String file1, String file2, String outputFile, int sampleRate, int bpp, int bufferSize, int channels) {
    FileInputStream in1 = null, in2 = null;
    FileOutputStream out = null;
    long longSampleRate = sampleRate;
    long byteRate = sampleRate * channels * bpp / 8;

    byte[] data;

    try {
        try {
            in1 = new FileInputStream(file1);
        } catch (Exception e) { }

        try {
            in2 = new FileInputStream(file2);
        } catch (FileNotFoundException e) { }

        out = new FileOutputStream(outputFile);

        long file1Size = 0;
        long file2Size = 0;

        if (in1 != null) { file1Size = in1.getChannel().size() - 44; }
        if (in2 != null) { file2Size = in2.getChannel().size() - 44; }

        long totalAudioLen = file1Size + file2Size;
        long totalDataLen = totalAudioLen + 36;

        FileUtils.writeWaveFileHeader(out, totalAudioLen, totalDataLen, longSampleRate, channels, byteRate, bpp);

        if (in1 != null) {
            in1.skip(44);
            data = new byte[bufferSize];

            if (file1Size < bufferSize) {
                data = new byte[(int)file1Size];
            }

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

                file1Size -= bufferSize;

                if (file1Size <= 0) {
                    break;
                } else if (file1Size < bufferSize) {
                    data = new byte[(int)file1Size];
                }
            }
        }

        if (in2 != null) {
            in2.skip(44);
            data = new byte[bufferSize];

            if (file2Size < bufferSize) {
                data = new byte[(int)file2Size];
            }

            while (in2.read(data) != -1) {
                out.write(data);

                file2Size -= bufferSize;

                if (file2Size <= 0) {
                    break;
                } else if (file2Size < bufferSize) {
                    data = new byte[(int)file2Size];
                }
            }
        }

        out.close();
        if (in1 != null) { in1.close(); }
        if (in2 != null) { in2.close(); }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private static void writeWaveFileHeader(FileOutputStream out, long totalAudioLen, long totalDataLen, long longSampleRate, int channels, long byteRate, int bpp)
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)(channels * bpp); //(2 * 16 / 8);
    header[33] = 0;
    header[34] = (byte)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);
}

此代码的大部分来自 this answer .

Answer 1

我在我的 Android 应用程序中正是这样做的。我根据用户选择合并多个文件，而不是两个。我使用 AsyncTask 在后台合并样本。在这里看看。只需过滤您需要的部分。如果你对我的应用程序感到好奇，它叫做 Sound Recorder + Pro ，除了合并，我还混合，添加回声和放大样本:

    @Override
    protected Void doInBackground(Void... params) {

        isProcessingOn=true;
        try {
            DataOutputStream amplifyOutputStream = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(Environment.getExternalStorageDirectory() + "/Soundrecpluspro/"  + year +"-"+ month +"-"+ date +"-"+ hour+"-" + min +"-"+ sec+"ME.wav")));
            DataInputStream[] mergeFilesStream = new DataInputStream[selection.size()];
            long[] sizes=new long[selection.size()];
            for(int i=0; i<selection.size(); i++) {
                File file = new File(Environment.getExternalStorageDirectory() + "/Soundrecpluspro/" +selection.get(i));
             sizes[i] = (file.length()-44)/2;
            }
            for(int i =0; i<selection.size(); i++) {
                mergeFilesStream[i] =new DataInputStream(new BufferedInputStream(new FileInputStream(Environment.getExternalStorageDirectory() + "/Soundrecpluspro/" +selection.get(i))));

                if(i == selection.size()-1) {
                    mergeFilesStream[i].skip(24);
                    byte[] sampleRt = new byte[4];
                    mergeFilesStream[i].read(sampleRt);
                    ByteBuffer bbInt = ByteBuffer.wrap(sampleRt).order(ByteOrder.LITTLE_ENDIAN);
                    RECORDER_SAMPLERATE = bbInt.getInt();
                    mergeFilesStream[i].skip(16);
                }
                    else {
                        mergeFilesStream[i].skip(44);
                    }

            }

            for(int b=0; b<selection.size(); b++) {
            for(int i=0; i<(int)sizes[b]; i++) {
                 byte[] dataBytes = new byte[2];
                 try {
                 dataBytes[0] = mergeFilesStream[b].readByte();
                 dataBytes[1] = mergeFilesStream[b].readByte();
                 }
                 catch (EOFException e) {
                    amplifyOutputStream.close();
                 }
                 short dataInShort = ByteBuffer.wrap(dataBytes).order(ByteOrder.LITTLE_ENDIAN).getShort();
                 float dataInFloat= (float) dataInShort/37268.0f;


                short outputSample = (short)(dataInFloat * 37268.0f);
                byte[] dataFin = new byte[2];
               dataFin[0] = (byte) (outputSample & 0xff);
               dataFin[1] = (byte)((outputSample >> 8) & 0xff);        
              amplifyOutputStream.write(dataFin, 0 , 2);

            }
            }
            amplifyOutputStream.close();
            for(int i=0; i<selection.size(); i++) {
                mergeFilesStream[i].close();
            }

        } catch (FileNotFoundException e) {

            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }
        long size =0;
        try {
            FileInputStream fileSize = new FileInputStream(Environment.getExternalStorageDirectory() + "/Soundrecpluspro/"+year +"-"+ month +"-"+ date +"-"+ hour+"-" + min +"-"+ sec+"ME.wav");
            size = fileSize.getChannel().size();
            fileSize.close();
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        final int RECORDER_BPP = 16;

        long datasize=size+36;
        long byteRate = (RECORDER_BPP * RECORDER_SAMPLERATE)/8;
        long longSampleRate = RECORDER_SAMPLERATE;
        byte[] header = new byte[44];


         header[0] = 'R';  // RIFF/WAVE header 
         header[1] = 'I';
         header[2] = 'F';
         header[3] = 'F';
         header[4] = (byte) (datasize & 0xff);
         header[5] = (byte) ((datasize >> 8) & 0xff);
         header[6] = (byte) ((datasize >> 16) & 0xff);
         header[7] = (byte) ((datasize >> 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) 1;
         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) ((RECORDER_BPP) / 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) (size & 0xff);
         header[41] = (byte) ((size >> 8) & 0xff);
         header[42] = (byte) ((size >> 16) & 0xff);
         header[43] = (byte) ((size >> 24) & 0xff);
       // out.write(header, 0, 44); 

        try {
             RandomAccessFile rFile = new RandomAccessFile(Environment.getExternalStorageDirectory() + "/Soundrecpluspro/"  +year +"-"+ month +"-"+ date +"-"+ hour+"-" + min +"-"+ sec+ "ME.wav", "rw");
            rFile.seek(0);
            rFile.write(header);
            rFile.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        return null;
    }