microsoft / audio-recorder

Audio Recorder is an example application demonstrating how to record and play audio in Windows Phone 8 devices. XNA Audio API and Windows Audio Session API (WASAPI) are covered by the example.

AudioRecorder

AudioRecorder example application demonstrates how to record and play audio on Windows Phone 8 devices. XNA Framework Audio API and Windows Audio Session API (WASAPI) are covered by the application.

 

This example application is hosted in GitHub: https://github.com/Microsoft/audio-recorder

Developed with:

• Microsoft Visual Studio Express for Windows Phone 2012.

Compatible with:

• Windows Phone 8

Tested to work on:

• Nokia Lumia 920
• Nokia Lumia 925
• Nokia Lumia 1520

Instructions

Make sure you have the following installed:

• Windows 8
• Windows Phone SDK 8.0

To build and run the sample:

• Open the SLN file
  • File > Open Project, select the file AudioRecorder.sln
• Select the target, for example 'Emulator WXGA'.
• Press F5 to build the project and run it on the Windows Phone Emulator.

To deploy the sample on Windows Phone device:

• See the official documentation for deploying and testing applications on Windows Phone devices at http://msdn.microsoft.com/en-us/library/windowsphone/develop/ff402565(v=vs.105).aspx

About the implementation

Important folders:

Folder	Description
/	Contains the project file, the license information and this file (README.md)
AudioRecorder	Root folder for the implementation files.
AudioRecorder/Assets	Graphic assets like icons and tiles.
AudioRecorder/Properties	Application property files.
AudioRecorder/Resources	Application resources.
WasapiAudioComp	Root folder of Windows Phone Runtime component for WASAPI implementation files.

Important classes:

File	Description
MainPage	This class is the main UI of the app.
AudioManager	Handles all the UI related audio actions.
XnaAudio	Handles the recording and playback of audio using XNA Audio API.
WasapiAudio	Handles the audio capturing and rendering using WASAPI.

For more information about audio handling in Windows Phone 8 devices, see an article available at http://developer.nokia.com/Community/Wiki/Audio_recording_and_playback_options_in_Windows_Phone.

Known issues

No known issues.

License

See the license file delivered with this project. The license is also available online at https://github.com/Microsoft/audio-recorder/blob/master/License.txt

Version history

• 0.3.0.0 Added 720p resolution support and yet another missing dependency fix.
• 0.2.0.0 Added a missing dependency affecting others than ARM device builds.
• 0.1.0.0 First beta release.

audio-recorder's Issues

Save icon shown instead of stop

In the files page, the save icon is shown instead of the stop icon. In addition, the save capability does not seem to exist (and I can't find the files in the "Files" file manager by Microsoft).

recorded audio with AAC format using window phone

Hi pro
Could anyone give me a hint on compression of recorded audio with AAC format using window phone 8.0?
The required spec is below

Bitrate: 16kbps
Sampling rate: 11025Hz
Channels: mono

The user need the small size to transfer over cloud service. The size recorded audio for 10s must be around 18kb

Thank you.

AccessViolationException

1. Open Recorder
2. Tap on Quality to change to Stereo
3. Press the Record button and record some audio.
4. Tap on the File button to access the file you recorded.
5. Play the file.
6. Click Back to return to Recorder.
7. Click Record.

Application crashes - System.AccessViolationException in AudioRecorder.DLL ...
Attempted to read or write protected memory. ...

Is that possible 2 way call recoridng in background?

It's more important future for Windows Phone 8+, and a lot of people need it.

WasapiAudio::Update() will skip audio samples smaller than Render buffer

Currently, the Update() method will not play a sound sample if the sample sound is smaller than the audio buffer given by the Render device. The check:

if (audioIndex + (long)numFramesAvailable * m_sourceFrameSizeInBytes < audioByteCount)

will essentially skip such samples. Since I use the WASAPI code for small sound effects, I needed to fix this. The following code is what I use:

    if (SUCCEEDED(hr))
    {
        // Grab all the available space in the shared buffer.
        hr = m_pRenderClient->GetBuffer(numFramesAvailable, &pData);
    }

    // NEW CODE STARTS HERE 

    if (SUCCEEDED(hr))
    {

        UINT32 numFramesInData = (audioByteCount - audioIndex) / m_sourceFrameSizeInBytes;
        if (numFramesInData > numFramesAvailable)  // We do not have so many frames in audio buffer
        {
            numFramesInData = numFramesAvailable;
        }

        memcpy(pData, audioBytes + audioIndex, numFramesInData * m_sourceFrameSizeInBytes);
        audioIndex += numFramesInData * m_sourceFrameSizeInBytes;
        hr = m_pRenderClient->ReleaseBuffer(numFramesInData, 0);

    }

    // NEW CODE ENDS HERE 

    if (SUCCEEDED(hr))
    {
        hr = m_pDefaultRenderDevice->GetCurrentPadding(&numFramesPadding);
    }

Audio samples smaller than the frame size are essentially skipped. If you find the code useful and correct, you can use it :-)