[wdmaudiodev] help: Audio filter driver
- From: "Saad Bashir" <imsaady@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Tue, 4 Jul 2006 00:06:16 -0700
hi ,
i am developing a device upper filter driver for audio device that will also
save the streams passing through it.
to process the data , i am trying to intercept IRP_MJ_DEVICE_CONTROL IRPs
with following IoControl codes.
IOCTL_KS_WRITE_STREAM
IOCTL_KS_READ_STREAM
I defined them as below.
#define IOCTL_KS_READ_STREAM CTL_CODE(FILE_DEVICE_KS, 0x005,
METHOD_NEITHER, FILE_ANY_ACCESS)
#define IOCTL_KS_WRITE_STREAM CTL_CODE(FILE_DEVICE_KS, 0x004,
METHOD_NEITHER, FILE_WRITE_ACCESS)
while a sound was being played and i tried to interecept
IOCTL_KS_READ_STREAM in deviceIocontrol routine i could not recieve irps
with this iocontrol code.
when i printed above devclared IOCTL_KS_READ_STREAM and recieved code while
debugging their values are printed as below
declared IOCTL_KS_READ_STREAM code : 3080215
recieved io control code: 3080195
the recieved code is equal to as defined below with function code 0x000
CTL_CODE(FILE_DEVICE_KS, 0x000, METHOD_NEITHER, FILE_ANY_ACCESS)
where does the problem lies.
am i declaring IOCTL_KS_READ_STREAM with wrong function code ?
and recieved irp with above io control code corresponds to what???
i want to intercept IOCTL_KS_READ_STREAM and save the stream to ta file in
wave format.
am i following the correct approach?
2ndly if i get the data buffer through irp. what is the procedure to save
that data to file?
looking forward for your response...
Regards
___________
Saad Bashir
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