我一直在试图合并在Android双波文件现在相当长的一段时间，但真的似乎无法得到它的正常工作。

I have been trying to merge two WAVE files on Android for quite some time now but really can't seem to get it working properly.

一切看起来不错，文件读取，并写入这也是可读在后一阶段，其文件大小我希望看到的输出文件。

Everything looks fine, the files are read, and written to the output file which is also readable at a later stage and has the file size I would expect to see.

在右侧的应用程序已经完成合并发生的问题。此消息将在日志中显示：错误的updateListener发生，记录被中止这是从的 extAudioRecorder 当 OnRecordPositionUpdateListener 到达catch子句出现（异常有以下detailMessage：写失败：EBADF（错误的文件数））。这似乎并没有破坏任何东西，所以我不担心这个。

The problems occur right after the app has finished merging. This message will show in the log: Error occured in updateListener, recording is aborted which is a message from extAudioRecorder and appears when the OnRecordPositionUpdateListener reaches the catch clause (the Exception has the following detailMessage: write failed: EBADF (Bad file number)). This does not seem to break anything so I'm not too worried about this.

当我尝试创建一个 真正的问题出现MediaPlayer的 并调用 的setDataSource（字符串路径） 上的MediaPlayer的实例。每当我做一个合并的文件下面的错误信息将在日志中显示：无法创建媒体播放器（即 IOException异常时引发包含以下detailMessage： setDataSourceFD失败：状态= 0x80000000的）。请注意，第一次文件将发挥完美的罚款（第一个文件是不是由 combineWaveFiles（）方法制成）。看来，错误消息以指示该音频文件的格式不正确和/或不能被在MediaPlayer读

The real problem arises when I try to create a MediaPlayer and call the setDataSource(String path) on the MediaPlayer instance. Whenever I do this with a merged file the following error message will show in the log: Unable to to create media player (the IOException that is thrown contains the following detailMessage: setDataSourceFD failed.: status=0x80000000). Note that the first time the file will play perfectly fine (this first file was not made by the combineWaveFiles() method). That Error message appears to indicate that the audio file's format is incorrect and/or can't be read by the MediaPlayer.

我的问题是，如果有人看到任何实际问题与下面的code（我知道这是次优的在很多方面，但我preFER得到它的第一个工作，然后担心性能）。

My question is if anyone sees any real problems with the code below (I know it's sub-optimal in many ways but I prefer to get it to work first then worry about performance).

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);
}

这code大部件从采取这个答案。

推荐答案

我这样做完全在我的Andr​​oid应用程序。代替两个岛合并根据用户选择的多个文件。我使用的AsyncTask合并样品中的背景。看看在这里。只是过滤，你需要的部分。如果你是好奇我的应用程序，其所谓的录音机+专业版< /一>，除了合并I DO混合，添加回声，放大样本：

i do this exactly in my android app. Instead of two, i merge multiple files based on users selection. I use AsyncTask to merge the samples in the background. Take a look at it here. Just filter the section that you need. If you are curious about my app, its called Sound Recorder + Pro, Beside merge i do mix, add echo and amplify samples:

    @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;
    }