Overview
The AudioCapture application uses Qt's QAudioInput for cross-platform audio capturing. This program has been tested on Windows and MacOS. Download the latest version from the releases page.
The Windows release requires vc_redist.x64.exe from Microsoft.
Usage
Using this app is very simple:
- Make sure that you have connected a microphone to your computer.
- On Ubuntu, you need to
sudo apt-get install libqt5multimedia5-plugins - Start the AudioCapture app. You should see a window like the following.
- Set the audio capture parameters.
- Make sure the correct audio device is selected.
- The preferred "Sample Size" should be 16. In our testing, 8- and 32-bits per sample did not produce useful data.
- The number of output channels can be one or two depending on the connected microphone.
- Click the "Link" button to link the app to the lab network. If successful, the button should turn into "Unlink".
- If a firewall complains, allow the app to connect to the network.
- Please allow microphone access if asked.
- You should now have a stream on your lab network that has type "Audio" and its name is the name entered in the GUI. Note that you cannot close the app while it is linked.
Build
The build instructions for this app are mostly the same as the generic LSL App build instructions.
Qt Multimedia module is required. On Ubuntu this does not come with qt5 by default. Install it with sudo apt-get install qtmultimedia5-dev. On Mac, with homebrew, it is only included in qt6 >= 6.2, which isn't out yet, so qt5 is required.
On Mac, it appears to be necessary to use the Xcode generator: cmake -B build -S . -DCMAKE_INSTALL_PREFIX="build/install" -G Xcode
Note that code-signing has been disabled.
Further Notes
The previous version of AudioCaptureWin can be found as release v0.1 in this repository.
For Windows XP there is an older LSL audio recording app available on request; it uses the irrKlang audio library, which in turn uses DirectX audio on Windows. That application does not support support accurate time synchronization and is therefore deprecated.