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517 lines
24 KiB
517 lines
24 KiB
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leftmargin=8>
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<div class=Section1>
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<h2><a name=MYSAMPLE><span style='font-family:Verdana'>Testcap –</span></a><span
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style='font-family:Verdana'> A WDM Streaming Video Capture Driver which
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requires no Hardware<o:p></o:p></span></h2>
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<h3><span style='font-family:Verdana'>SUMMARY<o:p></o:p></span></h3>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Testcap is a prototypical
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sample WDM stream class video capture driver which does not require any
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hardware for operation. The driver simulates the front-end components of a PC/TV,
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including input selection, TvTuning, TvAudio control, and finally, digital
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video streaming. <o:p></o:p></span></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>The TvTuner component
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supports tuning modes of Analog TV (NTSC/PAL/SECAM), AM/FM Radio, as well as
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ATSC (American Broadcast Digital Television).<o:p></o:p></span></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Testcap manifests itself
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in a DirectShow graph as four separate filters:<o:p></o:p></span></p>
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<ul type=disc>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l2 level1 lfo3;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Testcap Capture <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l2 level1 lfo3;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Testcap TvTuner <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l2 level1 lfo3;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Testcap TVAudio <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l2 level1 lfo3;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Testcap Crossbar<o:p></o:p></span></li>
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</ul>
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<p><span style='font-size:10.0pt;font-family:Verdana'>The capture portion
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produces five output streams, two of which are Capture and Preview which
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produce a variety of colorbars and grayscale patterns depending on the video
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input selected on the crossbar. The capture and preview streams contain video
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samples in either RGB24 or YUV422 color spaces and offer a large number of
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different image dimensions.<span style="mso-spacerun: yes"> </span>The other
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three capture streams are VBI, HWCC, and HWNABTS.<span style="mso-spacerun:
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yes"> </span>These three are VBI streams, and offer simulated CC and NABTS
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waveforms for decoding, and simulated hardware decoded CC and NABTS.<o:p></o:p></span></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>This driver contains
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sample implementations for almost all of the property sets involved in WDM
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video capture. Since Testcap doesn't control actual hardware, most of the
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property set implementations are useful only as prototypes which you can borrow
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for your own implementations. This driver represents one extreme of combining
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all functionality representing the front end of a PC/TV into a single driver.
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The other extreme is to create a separate driver each element: TvTuner,
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TvAudio, Crossbar, and Capture. <o:p></o:p></span></p>
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<p><b><span style='font-size:10.0pt;font-family:Verdana'>Keywords</span></b><span
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style='font-size:10.0pt;font-family:Verdana'>: Video capture, WDM, stream
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class, TvTuner, driver, VBI.<o:p></o:p></span></p>
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<h3><span style='font-family:Verdana'>BUILDING THE SAMPLE<o:p></o:p></span></h3>
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<p><! ---------------- Snip Snip ---------------- ><span style='font-size:10.0pt;
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font-family:Verdana'>The sample is built with the standard DDK BUILD utility in
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the standard checked or free DDK build environment. Testcap is completely
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contained in one directory. The resulting binary from the build process is
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Testcap.sys, which is compatible on x86 and Alpha platforms.<o:p></o:p></span></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>Testcap is not a PnP
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driver, since no hardware is involved, and it must be installed manually:<o:p></o:p></span></p>
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<ul type=disc>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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|
mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>My Computer.Properties.Hardware.Hardware Wizard.Add
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new hardware. <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>"To install hardware which is not Plug and Play
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compatible, click Next." <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>"No, I want to select the hardware from a
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list." <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>"What type of hardware do you want to
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install" <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Sound, Video, and Game Controllers <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>"Have Disk…" <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Browse to find "Testcap.inf" <o:p></o:p></span></li>
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<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
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mso-list:l0 level1 lfo6;tab-stops:list .5in'><span style='font-size:10.0pt;
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font-family:Verdana'>Browse to find "Testcap.sys" when requested<o:p></o:p></span></li>
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</ul>
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<h3><span style='font-family:Verdana'><! ---------------- Snip Snip ---------------- >RESOURCES<o:p></o:p></span></h3>
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<p><span style='font-size:10.0pt;font-family:Verdana'>This driver has been
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tested with the following applicatons: Graphedt.exe, AMCap.exe, WebTV for
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Windows.<o:p></o:p></span></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>This website contains
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general information on driver and hardware development:<o:p></o:p></span></p>
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<p style='margin-left:1.0in'><a href="http://www.microsoft.com/hwdev">http://www.microsoft.com/hwdev</a><span
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style='font-size:10.0pt;font-family:Verdana'> <o:p></o:p></span></p>
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<p><span style='font-size:10.0pt;font-family:Verdana'>This website contains information
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on DirectShow:<o:p></o:p></span></p>
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<p style='margin-left:1.0in'><a href="http://www.microsoft.com/directx">http://www.microsoft.com/directx</a>
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</p>
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<h3 style='margin-left:1.0in'><span style='font-family:Verdana'> <o:p></o:p></span></h3>
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<h3><span style='font-family:Verdana'>CODE TOUR<o:p></o:p></span></h3>
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<h4><span style='font-family:Verdana'>File Manifest<o:p></o:p></span></h4>
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<table border=0 cellspacing=0 cellpadding=0 width="100%" style='width:100.0%;
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border-collapse:collapse;mso-padding-alt:0in 5.4pt 0in 5.4pt'>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><b><u>File<o:p></o:p></u></b></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><b><u>Description<o:p></o:p></u></b></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre>Testcap.htm</pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre>The Sample Tour documentation for this sample (this file).</pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>SOURCES<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>The generic file for building the code sample.<o:p></o:p></span></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Testcap.inf<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>A sample installation file.<o:p></o:p></span></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>CapStrm.h<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Declarations of streams and formats supported by the driver.<o:p></o:p></span></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>CapMain.c<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>DriverEntry(), initialize, un-initialize, and adapter SRB processing.<o:p></o:p></span></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>CapMain.h<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Header file for above.<o:p></o:p></span></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>CapVideo.c<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Stream SRB processing.<o:p></o:p></span></pre></td>
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|
</tr>
|
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>CapVideo.h<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Header file for above.<o:p></o:p></span></pre></td>
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|
</tr>
|
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>CapXfer.c<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Synthesizes images.<o:p></o:p></span></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>CapXfer.h<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Header file for above.<o:p></o:p></span></pre></td>
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</tr>
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<tr>
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
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style='font-family:Courier'>CapIRQ.c<o:p></o:p></span></pre></td>
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<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
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style='font-family:Courier'>Sample IRQ routines. <o:p></o:p></span></pre></td>
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</tr>
|
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<tr>
|
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>CapProp.c<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Process all adapter property sets including TvTuner, Crossbar, VideoProcAmp, and CameraControl properties.<o:p></o:p></span></pre></td>
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</tr>
|
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<tr>
|
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<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>CapProp.h<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Header file for above.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>CapVBI.c<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Stream SRB processing for VBI pins<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>CapVBI.h<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Header file for above.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>DDraw.c<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Sample functions for handling kernel DDraw interfaces.<span style="mso-spacerun: yes"> </span>Not actually used by this driver at present.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Mediums.h<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Describes topological connections for the streams.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Testcap.rc<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Resource file mainly for version<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>VBIdata.c<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Contains typical VBI waveforms.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>VBIdata.h<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Header file for above.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>VBIXfer.c<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Synthesizes VBI data.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
<tr>
|
|
<td valign=top style='padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>VBIXfer.h<o:p></o:p></span></pre></td>
|
|
<td width="85%" valign=top style='width:85.0%;padding:0in 5.4pt 0in 5.4pt'><pre><span
|
|
style='font-family:Courier'>Header file for above.<o:p></o:p></span></pre></td>
|
|
</tr>
|
|
</table>
|
|
|
|
<pre><span style='font-family:Verdana'><span style="mso-spacerun: yes"> </span><o:p></o:p></span></pre>
|
|
|
|
<h4>Programming Tour</h4>
|
|
|
|
<p><span style='font-size:10.0pt;font-family:Verdana'>DriverEntry() is the
|
|
initial point of entry for the driver. It initializes the hardware initialization
|
|
structure and registers the secondary entry point functions. <o:p></o:p></span></p>
|
|
|
|
<p><span style='font-size:10.0pt;font-family:Verdana'>HwReceivePacket field
|
|
describes the entry point for receiving SRBs (Stream Request Packet) from
|
|
stream class driver. Here is a possible sequence of SRBs that this driver may
|
|
receive.<o:p></o:p></span></p>
|
|
|
|
<ol start=1 type=1>
|
|
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
|
|
mso-list:l1 level1 lfo9;tab-stops:list .5in'><span style='font-size:10.0pt;
|
|
font-family:Verdana'>SRB_INITIALIZE_DEVICE to initialize the device, and
|
|
called after DriverEntry().<o:p></o:p></span></li>
|
|
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
|
|
mso-list:l1 level1 lfo9;tab-stops:list .5in'><span style='font-size:10.0pt;
|
|
font-family:Verdana'>SRB_GET_STREAM_INFO to get supported stream format.<o:p></o:p></span></li>
|
|
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
|
|
mso-list:l1 level1 lfo9;tab-stops:list .5in'><span style='font-size:10.0pt;
|
|
font-family:Verdana'>SRB_GET_DATA_INTERSECTION to query a supported format
|
|
given some key fields.<o:p></o:p></span></li>
|
|
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
|
|
mso-list:l1 level1 lfo9;tab-stops:list .5in'><span style='font-size:10.0pt;
|
|
font-family:Verdana'>SRB_OPEN_STREAM to open a stream with supply format
|
|
from SRB_GET_DATA_INTERSECTION. Two additional entry point functions are
|
|
register for this stream for controlling the streaming state
|
|
(Srb->StreamObject->ReceiveControlPacket) and for streaming data
|
|
(Srb->StreamObject->ReceiveDataPacket). <o:p></o:p></span></li>
|
|
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
|
|
mso-list:l1 level1 lfo9;tab-stops:list .5in'><span style='font-size:10.0pt;
|
|
font-family:Verdana'>SRB_CLOSE_STREAM to close the open stream.<o:p></o:p></span></li>
|
|
<li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
|
|
mso-list:l1 level1 lfo9;tab-stops:list .5in'><span style='font-size:10.0pt;
|
|
font-family:Verdana'>SRB_UNINITIALIZE_DEVICE to indicate that a device has
|
|
been unloaded or removed.<o:p></o:p></span></li>
|
|
</ol>
|
|
|
|
<p><span style='font-size:10.0pt;font-family:Verdana'>This driver also register
|
|
entry points for canceling packets (HwCancelPacket) and for notifying if a
|
|
packet has timeout (HwRequestTimeoutHandler). <o:p></o:p></span></p>
|
|
|
|
<p><b><span style='font-size:10.0pt;font-family:Verdana'>Clocks<o:p></o:p></span></b></p>
|
|
|
|
<p><span style='font-size:10.0pt;font-family:Verdana'>Testcap, like most video
|
|
capture drivers, does not act as clock source for a filter graph. <o:p></o:p></span></p>
|
|
|
|
<p><b><span style='font-size:10.0pt;font-family:Verdana'>Frame rate and dropped
|
|
frames<o:p></o:p></span></b></p>
|
|
|
|
<p><span style='font-size:10.0pt;font-family:Verdana'>Digital cameras support
|
|
discrete frame rates; however, a client application can request to stream at any
|
|
rate. It is required by WDM video capture driver to either match or select the
|
|
next lower frame rate available. Over sampling can cause synchronization
|
|
problems. <o:p></o:p></span></p>
|
|
|
|
<p><span style='font-size:10.0pt;font-family:Verdana'>The dropped frame
|
|
information is calculated instead of actual count, and it is based on the
|
|
capture rate and the actual counts of frames captured. <o:p></o:p></span></p>
|
|
|
|
<p><b><span style='font-size:10.0pt;font-family:Verdana'>Work items<o:p></o:p></span></b></p>
|
|
|
|
<p><span style='font-size:10.0pt;font-family:Verdana'>Testcap is not persisting
|
|
TvTuner, Crossbar, VideoProcAmp and CameraControl property settings between
|
|
reboots. For an example of how this should be handled, look at the 1394 digital
|
|
video conferencing camera driver (1394dcam, capprop.c), also in this DDK.<o:p></o:p></span></p>
|
|
|
|
<p align=center style='text-align:center'><a href="#top"><span
|
|
style='font-size:10.0pt;font-family:Verdana'>Top of page</span></a><span
|
|
style='font-size:10.0pt;font-family:Verdana'> <o:p></o:p></span></p>
|
|
|
|
<table border=0 cellspacing=0 cellpadding=0 width=624 style='width:6.5in;
|
|
mso-cellspacing:0in;mso-padding-alt:0in 0in 0in 0in'>
|
|
<tr style='height:1.5pt'>
|
|
<td style='background:aqua;padding:.75pt .75pt .75pt .75pt;height:1.5pt'>
|
|
<p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<p><span style='font-size:7.5pt;font-family:"MS Sans Serif"'>© 1998 Microsoft
|
|
Corporation</span><span style='font-size:10.0pt;font-family:Verdana'> <o:p></o:p></span></p>
|
|
|
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</div>
|
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</body>
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</html>
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