2,782 questions
Here is an example of loopback-mode audio capturing. It's also be a good idea to read Chrome source code directly if Chrome has a solution.
Can wasapi record the loopback audio and exclude specify audio stream
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tonyye
1
Reputation point
I have one communication application, now I share my desktop and audio to other people.
I use wasapi to capture the system's audio, but the captured audio contains the mix of all audio being played, so it contains other people's voice too.
If I share this mixed audio to other people, he would get echo.
Is there any api to capture the mixed audio and exclude my application's audio?
Windows development Windows API - Win32
2 answers
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(179.20000000000002, 34%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXY%3C/text%3E%3C/svg%3E)
Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff2021-09-09T06:12:05.187+00:00 -
tonyye 1 Reputation point
2021-09-09T09:57:02.643+00:00 The chrome source code is too complex, I still don't know it's solution even I have cost some hours on it.
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Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff
2021-09-10T03:04:00.417+00:00 I have checked the
HRESULT WASAPIAudioInputStream::InitializeAudioEngine()in chrome source code and It‘s almost the same as Capturing a Stream. And according to Loopback Recording,WASAPI loopback contains the mix of all audio being played, regardless of the Terminal Services session the audio originated from. For example, you can run a loopback client in a service running in session 0 and capture audio from all user sessions, as well as audio being played from session 0.
Capturing all audio is a expected behavior, isn't It?
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tonyye 1 Reputation point
2021-09-10T09:04:09.59+00:00 The behavior isn't I except. I hope I can capture all audio stream except my application
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Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff
2021-09-24T08:04:12.047+00:00 Have you found a solution?
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Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff
2022-01-11T08:59:46.667+00:00 Benefited to (Loopback)Capture audio: Are APO effects captured too?, the questioner points the Application loopback API Capture Sample which can exclude a process from capture.