Hi Tim, I'm pretty new to kernel streaming. I see a lot of IOCTL_KS_* properties but i do not think i need to handle all. Can i find some info for which properties i need to look into. Also, one of my question is still unanswered. Can i implement a common solution for XP/Vista/Wn 7. I had run the total recorder application. The total recording application installs a audio class upper filter for XP and Vista. How is this possible in Vista when app is directly writing to DMA buffer? On Fri, Jan 8, 2010 at 11:37 PM, Tim Roberts <timr@xxxxxxxxx> wrote: > Sushma wrote: > > Pre-Vista, it is possible to insert an audio class upper filter to > intercept the kernel streaming ioctls. It is surprisingly difficult in > that situation to figure out what format the audio is in every case, so > plan some frustrating test time. > > > If the implement a audio class upper filter, what IRPs i need to look > out for capturing the data. > > > All kernel streaming transactions take place in internal ioctls, > IRP_MJ_INTERNAL_DEVICE_CONTROL. Data gets transferred with > IOCTL_KS_READ_STREAM and IOCTL_KS_WRITE_STREAM. You'll also need to monitor > the property exchanges through IOCTL_KS_PROPERTY. There are a lot of > properties being exchanged. > > If you don't have kernel streaming experience, you have a LOT of reading to > do. > > -- > Tim Roberts, timr@xxxxxxxxx > Providenza & Boekelheide, Inc. > ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/