Record Mic and Speaker audio simultanously, Like Skype conversation on a computer

[Narayan kumar]

Am new to C++.
Working on aC++ project recording all conversation happening on a computer like Skype, G Talk. Please someone suggest C++ API to achieve this.
I have tried using WaveIn api but it records only Mic audio but not the Speaker audio. Thanks in advance.

[helios]

OpenAL.

Note that to record anything, the system recording volumes have to be set appropriately. Often the speakers are muted for recording.