A 0-dependency C++/C windows library for handling WASAPI loopback audio devices
WinEcho is a C++ windows library (With an extra C interface) that allows playback of WASAPI loopback render devices on other render devices.
First, get a list of devices using the winecho::MyMMDeviceEnumerator class. This class accepts a EDataFlow parameter, but the library is set up to handle only EDataFlow::eRender devices.
When you find your capture device (recording device) and render device (playback device), you can generate a winecho::StreamInstance class.
The parameters are:
- Capture device
- Render devce
- Buffer size (bigger buffer sizes help with cracks in the playback, but add significant latency)
- Desired latency (in milliseconds. This is only a hint and is not guaranteed)
The winecho::StreamInstance::Start() method spawns the threads that handle capture and render.
The winecho::StreamInstance::Stop(bool wait) methods stops the threads (and with the wait parameter you choose wether to wait for the threads to finish).
Errors from the winecho::StreamInstance class can be queried using the winecho::StreamInstance::GetError() method.
Error handling is basic and only for the winecho::StreamInstance class, better handling may be needed
The library only supports devices with the same audio configuration (bit rate, channel number, sample size) in the same stream.
The C interface only implements winecho::MyMMDeviceEnumerator, winecho::MyMMDevice and winecho::StreamInstance.