文件流输出成音频文件

通过请求接口得到一个文件流，输出成mp3音频文件

var response = "请求部分略过...";
StreamWriter sw = new StreamWriter(@"D:\Desktop\2222.mp3");
sw.Write(response);
sw.Close();

然后代码执行也没有异常，但就是打开文件无法播放

然后我就打开GoldWave查看声波，提示无法确定格式，感觉跟后缀格式应该没关系，试过mp3、wav等那些常用的音频格式

然后根据软件提示转换成了如上图的这个文件类型和属性，然后看到声波是正常的

懂的老哥可以试试

Tips：我这是C#语言，这平台上没有C#频道，只能放兄弟Java这了，两兄弟也差不多==

扣扣：2076155011

首先确认你接收到的流是什么格式的音频流、带不带音频文件头，不带文件头那么需要先不补上文件头。

如果接收到的就是MP3流，也就是编码一直的话，那么补文件头直接合成就OK。

如果编码不一致，那么就需要转码了，比如WAV编码转成MP3编码，在合成音频文件即可

Postman返回的头信息

使用Naudio重采样的时候提示没有文件头

如何补上文件头合成呢？

我这有一个之前用过的java版的，你可以参考下：

public static void addWavHeader(String fileHeaderLess, String fileHeaderAdded) {
    FileInputStream sourceFileIs = null;
    FileOutputStream resultFileOs = null;
    File resultFile = new File(fileHeaderAdded);
    File sourceFile = new File(fileHeaderLess);
    try {
        WaveHeader waveHeader = new WaveHeader();
        waveHeader.DataHdrLeth = new Long(sourceFile.length()).intValue();
        waveHeader.fileLength = new Long(sourceFile.length() + 44 - 8).intValue();
        resultFileOs = new FileOutputStream(resultFile);
        sourceFileIs = new FileInputStream(sourceFile);
        byte[] sourceBytes = new byte[waveHeader.DataHdrLeth];
        sourceFileIs.read(sourceBytes);
        resultFileOs.write(waveHeader.getHeader());
        resultFileOs.flush();
        resultFileOs.write(sourceBytes);
        resultFileOs.flush();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (sourceFileIs != null) {
                sourceFileIs.close();
            }
            if (resultFileOs != null) {
                resultFileOs.flush();
                resultFileOs.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}



public class WaveHeader {



    public final char fileID[] = { 'R', 'I', 'F', 'F' };

    public int fileLength;

    public char wavTag[] = { 'W', 'A', 'V', 'E' };;

    public char FmtHdrID[] = { 'f', 'm', 't', ' ' };

    public int FmtHdrLeth = 16;

    public short FormatTag = 1;

    public short Channels = 1;

    public int SamplesPerSec = 8000;

    public int AvgBytesPerSec = 16000;

    public short BlockAlign = 2;

    public short BitsPerSample = 16;

    public char DataHdrID[] = { 'd', 'a', 't', 'a' };

    public int DataHdrLeth;



    public byte[] getHeader() throws IOException {

        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        writeChar(bos, fileID);

        writeInt(bos, fileLength);

        writeChar(bos, wavTag);

        writeChar(bos, FmtHdrID);

        writeInt(bos, FmtHdrLeth);

        writeShort(bos, FormatTag);

        writeShort(bos, Channels);

        writeInt(bos, SamplesPerSec);

        writeInt(bos, AvgBytesPerSec);

        writeShort(bos, BlockAlign);

        writeShort(bos, BitsPerSample);

        writeChar(bos, DataHdrID);

        writeInt(bos, DataHdrLeth);

        bos.flush();

        byte[] r = bos.toByteArray();

        bos.close();

        return r;

    }



    private void writeShort(ByteArrayOutputStream bos, int s) throws IOException {

        byte[] mybyte = new byte[2];

        mybyte[1] = (byte) ((s << 16) >> 24);

        mybyte[0] = (byte) ((s << 24) >> 24);

        bos.write(mybyte);

    }



    private void writeInt(ByteArrayOutputStream bos, int n) throws IOException {

        byte[] buf = new byte[4];

        buf[3] = (byte) (n >> 24);

        buf[2] = (byte) ((n << 8) >> 24);

        buf[1] = (byte) ((n << 16) >> 24);

        buf[0] = (byte) ((n << 24) >> 24);

        bos.write(buf);

    }



    private void writeChar(ByteArrayOutputStream bos, char[] id) {

        for (int i = 0; i < id.length; i++) {

            char c = id[i];

            bos.write(c);

        }

    }

方便加一下扣扣嘛 还是没弄好 ... 2076155011