Max Paklin

Search archieves. The topic of filtering audio stack has been discussed
multiple times in the past.
The summary is that you can't do this reliably.

-- Max.



"Bipin Mistry" <bpnmistry@gmail.com> wrote in message
news:1127382715.271336.47540@g14g2000cwa.googlegro ups.com...
> Hello,
>
> My task is to capture Audio (mic & Speaker) streams using Filter
> Driver.
> To understand Filter Driver architecture I have used Ctrl2Cap sample
> and many other samples available with MSDN and on the net. Am currently
> using source code of Ctrl2Cap sample Filter Deriver as a base for my
> Audio Filter Driver architecture.
>
> My Question:
> 1. What can be replaced with the FILE_DEVICE_KEYBOARD parameter in
> following IoCreateDevice() function to capture Audio Streams(Mic,
> Speaker)
> (Source code from Ctrl2Cap)
> status = IoCreateDevice( DriverObject,
> sizeof(DEVICE_EXTENSION),
> NULL,
> FILE_DEVICE_KEYBOARD,
> 0,
> FALSE,
> &device );
> MSND provided following 3 static defined values which as per me
> interact with sound related activity.
> - FILE_DEVICE_WAVE_SOUND
> - FILE_DEVICE_WAVE_IN
> - FILE_DEVICE_WAVE_OUT
> Am currently making RnD with FILE_DEVICE_WAVE_SOUND &
> FILE_DEVICE_WAVE_OUT.
>
> 2. With the above regards. What can be appropriate replacement for
> (\\Device\\KeyboardClass0) string in following source code that is
> needed to be converted to Unicode string to be passed to
> RtlFreeUnicodeString() function.
> (Source code from Ctrl2Cap)
> sprintf( ntNameBuffer, "\\Device\\KeyboardClass0" );
> RtlInitAnsiString( &ntNameString, ntNameBuffer );
> RtlAnsiStringToUnicodeString(&ntUnicodeString, &ntNameString, TRUE);
> ::
> RtlFreeUnicodeString( &ntUnicodeString );
>
> I am using following:
> for Wave Out :
> sprintf( ntNameBuffer, "\\Device\\AudioOut" );
> for Sound :
> sprintf( ntNameBuffer, "\\Device\\Sound0" );
> sprintf( ntNameBuffer, "\\Device\\Snd0" );
>
> can any one please guide me as I think so I am stuck up with the basic
> driver object creation area. As this is new area to me and specifically
> Audio is new area and am not been able to get much help or the sample
> for sound recording using filter device driver.
>
> Thanks a lot in advance.
> Bipin
>