[wdmaudiodev] Re: help: Audio filter driver

  • From: "Giuseppe Maione" <giuseppe.maione@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Tue, 4 Jul 2006 12:34:34 +0200

Hi,
maybe I am wrong but you are defining a IOCTL_KS_READ_STREAM code which is
already define, that is why you intercept the "wrong" code.
Check where are they define and check their values.

Then, if you manage to get the data buffer through irp, you can have a look
to the audio virtual dirver sample in the SDK. It does the same thing.

Hope this helps,

Regards,

Giuseppe Maione


On 7/4/06, Saad Bashir <imsaady@xxxxxxxxx> wrote: 


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




--
Giuseppe Maione

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