I Would like to make an appliaction in c# (or vb.net) that records every sound that comes out from the speakers when i tell it to, and when im finished i want to push a button and save it as an mp3 (or some other format).
So far i have only found APIs that can record something from a microphone.
My Question is: Is there anything in the .NET framework or is there some API for making this possible?
I haven't seen much on sound recording from the soundcard purely from the .NET framework, but you may find this interesting. There are libraries such as FMOD and BASS that work with .NET and may provide you with the ability to record the sound coming out the speakers. I came across this thread for BASS, but I'm not sure if that's of any use.
来源：https://stackoverflow.com/questions/1582505/recording-and-saving-sounds-from-applications