Video Capture
in [Device Drivers]
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From: Max Paklin on 24 Aug 2005 20:24 But this doesn't apply to the OP case. He wanted to capture the content of the screen or a window and to ship it to the device. You want to have GDI rendering engine on the device? Not practical cost-wise. The simple solution is to send out everything. Want to reduce bitrate? Apply simple compression (M-JPEG or such) to it. -- Max. "Lev Kazarkin" <mirrdrv(a)demoforge.com> wrote in message news:65B5EBF7-2198-4DF3-9937-A62E69B3E4DD(a)microsoft.com... > Its simple, Maxim. > Performance. > Mirror driver gives an ability to see where > the screen or a window is changed. > The traffic may be reduced 100 or 1000 times. > > Btw, no Video 4 windows or AVStream is needed > for the task. For what?! > > -- > Best regards, > Lev Kazarkin > http://www.demoforge.com > > > > "Maxim S. Shatskih" wrote: > >> For what? The stupid Video For Windows DLL which does BitBlt from the >> screen to its own memory is simpler and does the task. >> >> -- >> Maxim Shatskih, Windows DDK MVP >> StorageCraft Corporation >> maxim(a)storagecraft.com >> http://www.storagecraft.com >> >> "Lev Kazarkin" <mirrdrv(a)demoforge.com> wrote in message >> news:AD468C46-31E4-4860-9989-539C4CF7E1B2(a)microsoft.com... >> > Hi, Rotem >> > >> > I agree with Maxim. >> > As we're talking about a screen capture, >> > a mirror driver could be a good idea. >> > >> > -- >> > Best regards, >> > Lev Kazarkin >> > http://www.demoforge.com >> > >> > >> > >> > "Maxim S. Shatskih" wrote: >> > >> > > I see 3 modules in this: >> > > - screen capture >> > > - USB hardware driver >> > > - the app which will run the pipeline >> > > >> > > -- >> > > Maxim Shatskih, Windows DDK MVP >> > > StorageCraft Corporation >> > > maxim(a)storagecraft.com >> > > http://www.storagecraft.com >> > > >> > > "Rotem" <Rotem(a)discussions.microsoft.com> wrote in message >> > > news:4A0E6F5B-FBF9-4AF7-ABFD-4DE08D35F2A7(a)microsoft.com... >> > > > Hi, >> > > > >> > > > I'm new to device drivers. >> > > > I want to write a driver that captures the PC screen (or another >> > > > window) >> and >> > > > sends the raw video to a hardware dvice via the USB or PCI bus. >> > > > All video capture examples that I have seen show video capture from >> > > > the >> > > > external hardware into the PC (for render or storage). I need the >> opposite >> > > > direction. >> > > > Shoud I write an AVStream or a PCI/USB miniport driver as I'm >> > > > targeting >> the >> > > > A/V out of the PC via these buses? >> > > > >> > > > Thanks in advance, >> > > > Rotem >> > > >> > > >> > > >> >> >>
From: Maxim S. Shatskih on 25 Aug 2005 04:20
Depends on task. If you need to generate a video movie stream (say, convertable to MP4 or WMV or such) - then mirror will not help. -- Maxim Shatskih, Windows DDK MVP StorageCraft Corporation maxim(a)storagecraft.com http://www.storagecraft.com "Lev Kazarkin" <mirrdrv(a)demoforge.com> wrote in message news:65B5EBF7-2198-4DF3-9937-A62E69B3E4DD(a)microsoft.com... > Its simple, Maxim. > Performance. > Mirror driver gives an ability to see where > the screen or a window is changed. > The traffic may be reduced 100 or 1000 times. > > Btw, no Video 4 windows or AVStream is needed > for the task. For what?! > > -- > Best regards, > Lev Kazarkin > http://www.demoforge.com > > > > "Maxim S. Shatskih" wrote: > > > For what? The stupid Video For Windows DLL which does BitBlt from the > > screen to its own memory is simpler and does the task. > > > > -- > > Maxim Shatskih, Windows DDK MVP > > StorageCraft Corporation > > maxim(a)storagecraft.com > > http://www.storagecraft.com > > > > "Lev Kazarkin" <mirrdrv(a)demoforge.com> wrote in message > > news:AD468C46-31E4-4860-9989-539C4CF7E1B2(a)microsoft.com... > > > Hi, Rotem > > > > > > I agree with Maxim. > > > As we're talking about a screen capture, > > > a mirror driver could be a good idea. > > > > > > -- > > > Best regards, > > > Lev Kazarkin > > > http://www.demoforge.com > > > > > > > > > > > > "Maxim S. Shatskih" wrote: > > > > > > > I see 3 modules in this: > > > > - screen capture > > > > - USB hardware driver > > > > - the app which will run the pipeline > > > > > > > > -- > > > > Maxim Shatskih, Windows DDK MVP > > > > StorageCraft Corporation > > > > maxim(a)storagecraft.com > > > > http://www.storagecraft.com > > > > > > > > "Rotem" <Rotem(a)discussions.microsoft.com> wrote in message > > > > news:4A0E6F5B-FBF9-4AF7-ABFD-4DE08D35F2A7(a)microsoft.com... > > > > > Hi, > > > > > > > > > > I'm new to device drivers. > > > > > I want to write a driver that captures the PC screen (or another window) > > and > > > > > sends the raw video to a hardware dvice via the USB or PCI bus. > > > > > All video capture examples that I have seen show video capture from the > > > > > external hardware into the PC (for render or storage). I need the > > opposite > > > > > direction. > > > > > Shoud I write an AVStream or a PCI/USB miniport driver as I'm targeting > > the > > > > > A/V out of the PC via these buses? > > > > > > > > > > Thanks in advance, > > > > > Rotem > > > > > > > > > > > > > > > > > > |