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Eventually the song started up again, and WASAPI dutifully reported that there was a glitch detected. When the song stopped, no more data was available to capture. The flag in question is AUDCLNT_BUFFERFLAGS_DATA_DISCONTINUITY. IAudioCaptureClient::GetBuffer set flags to 0x00000001 on pass 5381 after 1088829 frames You’ll get this output when you start it back up: >loopback-capture While loopback-capture is running, stop the song, and then start it again. When nothing is playing, there is nothing to capture.įor example, play a song, and then run loopback-capture. So this app creates its own waitable timer.Īnother oddity is that WASAPI will only push data down to the render endpoint when there are active streams. One is that “event mode” doesn’t work for loopback capture you can call pAudioClient->Initialize(... AUDCLNT_STREAMFLAGS_LOOPBACK | AUDCLNT_STREAMFLAGS_EVENTCALLBACK, ... ), you can call pAudioClient->SetEventHandle(…), and everything will succeed… but the “data is ready” event will never fire. There are a couple of oddities for WASAPI loopback capture.
![loopback download loopback download](https://screenshots.macupdate.com/JPG/58464/58464_1633424857_scr.jpg)
int-16 attempts to coerce data to 16-bit integer format file saves the output to a file (loopback-capture.wav if omitted)) device captures from the specified device (default if omitted)
![loopback download loopback download](https://miro.medium.com/max/1200/1*TW9tvQf1qwvGhSP2dZJaMA.png)
list-devices displays the long names of all active playback devices. This allows you to record the sound that is coming out of your speakers.ĭownload loopback-capture.exe >loopback-capture -? This post is a sample WASAPI loopback capture app.
LOOPBACK DOWNLOAD HOW TO
In a previous post I showed how to play silence to a given audio device and hinted at a possible application.