BT878A视频采集卡WDM驱动

Test Release build 1.4.0.0 ------------------------------------------------------ Release Notes for the Conexant Bt848/878 VDIG Beta 1.4 ------------------------------------------------------ 19 February 1999 Michael Eskin Senior Software Engineer Conexant Systems (formerly Rockwell Semiconductor Systems) (formerly Brooktree) (619) 535-3476 Personal email: michael.eskin@rss.rockwell.com VDIG support and bug reports: rss.did.solutions@rss.rockwell.com VDIG FTP Site: ftp://fusion:broadcast@ftp.brooktree.com/VDIG_Drivers/ Requires: -------- Pentium 200 MHz or faster (MMX preferred). Pentium II is optimal. Bt848 or Bt878 reference board Rockwell WDM audio and video capture drivers already installed on system. (release (free) build preferred) Quicktime 3.0 or later (downloadable from http://www.apple.com/quicktime/download/ ) Features: -------- - Supports both synchronous and asynchronous uncompressed capture at up to 30 fps. - Asynchronous compressed capture to 2VUY 4:2:2 format. (Listed in compression dialog as Conexant 4:2:2 Video) - Full realtime table-driven gamma correction of uncompressed streams, with black level and white level control. (Gamma value mapped to Sharpness slider in control panel) - MMX detection and optimizations on pixel transforms. - Mapping of Quicktime analog controls to DirectShow properties. - Now includes a simple app to bring up the DirectShow Tuner property page for changing TV channels on cards equipped with a tuner. - Now supports frame rate control. I'd much rather capture a solid 15 fps than a jerky 27fps on a slow system. - Now self-installing. Sets up DirectShow registry entries if not found. - Automatic version checking of registry preferences. If the wrong settings version is found in the registry, a new set of default values is written. Theory of Operation ------------------- Layered on top of WDM video capture drivers, the VDIG implements both a Quicktime VDIG and a DirectShow filter component to proxy video frames into Quicktime. At VDIG startup, the component creates a DirectShow filter graph, and then connects itself to the graph. As video frames are streamed by the WDM video capture device, they are delived to Quicktime through the VDIG. Analog controls (brightness, contrast, hue, saturation) are mapped from the Quicktime semantics to the DirectShow AnalogProcAmp properties. WDM Video Capture Driver Compatibility: -------------------------------------- Tested on: Rockwell Bt848/Bt878 eval board using the Rockwell reference WDM video capture drivers version 2.2.0.1A ftp://fusion:broadcast@ftp.brooktree.com/VDIG_Drivers/ Hauppauge WinTV using Hauppauge Windows 98 WDM capture drivers version 1.3 http://www.hauppauge.com/html/98_sw.htm Note that if required, the Rockwell WDM drivers may be used with the Hauppauge WinTV cards for composite and S-Video capture. Tuner control will not function if the Rockwell drivers are used with a Hauppauge WinTV card. The majority of testing has been on our Rockwell Bt878 evaluation cards running our Rockwell developed WDM drivers. Testing has started with other Bt878 cards running non-Rockwell developed drivers, but I cannot guarantee the performance of the VDIG on those cards. If the VDIG fails to work with a particular Bt848 or Bt878 card, we suggest you try installing the Rockwell WDM drivers available on the FTP site listed above. Installation/Operation Instructions: ----------------------------------- 1) You must have Windows 98 and the Rockwell Bt848/878 WDM video capture drivers (Free version) already properly installed on the target system. You must also have QuickTime3.0 or later installed on the target machine. While Quicktime Pro is not required for using the VDIG, it is required to view many of the video track properties in MoviePlayer. 2) Run the install.bat batch file to perform the following two steps. If you do not run the batch file, copy the file manually. The install.bat file assumes that the Windows 98 system directory is is c:\windows\system. If it is different on your system, edit the batch file accordingly. install.bat does the following: Moves the ConexantVDIG.qtx file to c:\windows\system 3) Run HackTV.exe. Note that the ConexantVDIG.qtx file MUST NOT be present in the same directory as HackTV. Make sure that the ConexantVDIG.qtx file ONLY appears in the c:\windows\system directory. 4) From the HackTV Video Settings dialog, in the Compression panel, select either "Conexant 4:2:2 Video" or "None" as the video compression setting to test the native VDIG capture modes. Other compression selections will simply use the uncompressed RGB capture and then run the captured frames through the selected Quicktime compression component. Maximum frame rate (particularly on slower systems) will be obtained by selecting "Conexant 4:2:2 Video". 5) If your board has a TV tuner installed, after starting HackTV and selecting the tuner as the video use the TunerControl.exe applet to bring up the DirectShow tuner property page to change channels. 6) When measuring video capture framerate, disable audio capture in HackTV. Performance: ----------- Currently I see about 28 fps max at 320x240 async compressed capture on my Dell P200. Uncompressed async capture tops out at about 24. On a Pentium-II 233 or faster I'm seeing 28+ fps. If using the VDIG on a slow system, try setting the frame rate to 15 fps for smoother video. I'd rather watch a smooth 15 fps than a jerky 27 fps. Limitations: ----------- If you are not getting 30 fps capture, I suggest reducing the frame rate to 15 fps in the Compression setting dialog since this will provide much smoother playback. Since the VDIG is layed on top of WDM video capture drivers, it is limited Windows 98 and future Windows OS versions that support the WDM video capture architecture. We have no plans to support Windows 95 or NT 4.0 since WDM video capture is not available on those platforms. This version assumes a single DirectShow video capture device and crossbar. Unfortunately, this was required in order to work with the wide range of Bt848/878 video capture cards out there. The alternative was to maintain a database of all manufacturer's driver filter component friendly names, which would restrict the application of the VDIG. Gamma correction and white/black level is performed only on the raw 16-bit RGB stream used for live viewing as well as raw capture to disk. The Conexant 4:2:2 Video format captured video is not gamma corrected. What's Next: ----------- Test on more non-Rockwell cards and WDM drivers. Feedback Requested ------------------ I am very interested in hearing back from ISVs about any bugs, crashes, etc that you may encounter in using the VDIG. Also, any consistent failures with particular graphics controllers, CPUs, etc. The VDIG should also work with non-Rockwell developed WDM drivers, but I have done no testing at this time with anything except our reference WDM drivers. I would appreciate any feedback on compatibility with other drivers. I have seen an occasional crash on completion of Conexant 4:2:2 YUV video capture when capturing "best" framerate, particularly when running on top of non-Rockwell WDM drivers. Please let me know if there are other features that you would like to see in this driver. If you have any applications other than HackTV that use Quicktime 3.0 capture on Win98, please let me