无法在 windows phone 8 中播放使用麦克风录制的 MP3 文件

Posted 2023-02-25

【中文标题】无法在 windows phone 8 中播放使用麦克风录制的 MP3 文件

【英文标题】：Can't play MP3 File recorded using Microphone in windows phone 8

【发布时间】：2014-10-23 12:10:59

【问题描述】：

    /// <summary>
    /// Updates the XNA FrameworkDispatcher and checks to see if a sound is playing.
    /// If sound has stopped playing, it updates the UI.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void dt_Tick(object sender, EventArgs e)
    
        try  FrameworkDispatcher.Update(); 
        catch  

        if (true == soundIsPlaying)
        
            if (soundInstance.State != SoundState.Playing)
            
                // Audio has finished playing
                soundIsPlaying = false;

                // Update the UI to reflect that the 
                // sound has stopped playing
                SetButtonStates(true, true, false);
                UserHelp.Text = "press play\nor record";
                StatusImage.Source = blankImage;
            
        
    

    /// <summary>
    /// The Microphone.BufferReady event handler.
    /// Gets the audio data from the microphone and stores it in a buffer,
    /// then writes that buffer to a stream for later playback.
    /// Any action in this event handler should be quick!
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void microphone_BufferReady(object sender, EventArgs e)
    
        // Retrieve audio data
        microphone.GetData(buffer);

        // Store the audio data in a stream
        stream.Write(buffer, 0, buffer.Length);

        var isoStore = System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication();

        if (isoStore.FileExists("AudioTest.mp3"))
            isoStore.DeleteFile("AudioTest.mp3");
        using (var targetFile = isoStore.CreateFile("AudioTest.mp3"))
        
            // WavHeaderWriter.WriteHeader(targetFile, (int)stream.Length, 1, microphone.SampleRate);
            var dataBuffer = stream.GetBuffer();

            targetFile.Write(dataBuffer, 0, (int)stream.Length);
            targetFile.Flush();
            targetFile.Close();
        
    

    /// <summary>
    /// Handles the Click event for the record button.
    /// Sets up the microphone and data buffers to collect audio data,
    /// then starts the microphone. Also, updates the UI.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void recordButton_Click(object sender, EventArgs e)
    
        // Get audio data in 1/2 second chunks
        microphone.BufferDuration = TimeSpan.FromMilliseconds(500);

        // Allocate memory to hold the audio data
        buffer = new byte[microphone.GetSampleSizeInBytes(microphone.BufferDuration)];

        // Set the stream back to zero in case there is already something in it
        stream.SetLength(0);

        // Start recording
        microphone.Start();

        SetButtonStates(false, false, true);
        UserHelp.Text = "record";
        StatusImage.Source = microphoneImage;
    

我有此代码用于使用麦克风进行录制并将其写入本地文件夹中的 mp3 文件。在使用模拟器时，我可以访问该文件并使用 VLC 播放器播放。但是当我使用设备时，我无法打开文件。有什么解决办法

【问题讨论】：

stream 是什么？除了文件名之外，我在这里看不到任何与 mp3 相关的内容。我们应该如何提供帮助？

仅将 .mp3 放在文件末尾并不能使其成为 mp3。 MP3 是编码音频数据的特定方式。您需要弄清楚麦克风数据的格式，然后将其编码为您想要的格式

【参考方案1】：

WP8 麦克风的音频数据不是 MP3，它是 PCM 波形格式：

Related Question

我建议不要将其编码为 MP3，而是使用 WMA，这是内置 API 直接支持的另一种格式。这个问题有你需要的样本：

Save Microphone Data to Audio File