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windows-xp/Source/XPSP1/NT/drivers/ddk/wdmaudio/msvad/readme.htm

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  14. <o:Author>Alper SELCUK</o:Author>
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  170. <body lang=EN-US link=blue vlink=purple style='tab-interval:.5in'>
  172. <div class=Section1>
  174. <h2><span style='font-family:Verdana'>Microsoft Virtual Audio Driver (MSVAD)<o:p></o:p></span></h2>
  176. <p><span style='font-size:10.0pt;font-family:Arial;color:red'>[This is
  177. preliminary documentation and subject to change.]</span><span style='font-size:
  178. 10.0pt;font-family:Verdana'><o:p></o:p></span></p>
  180. <h3><span style='font-family:Verdana'>SUMMARY<o:p></o:p></span></h3>
  182. <p><span style='font-size:10.0pt;font-family:Verdana'>This sample driver
  183. demonstrates the basics of writing a WDM audio driver. This sample uses a
  184. step-by-step approach to implement various WDM audio driver features. Each
  185. feature is implemented as a separate driver and uses the common classes and
  186. services implemented in root directory. The driver developers can use the same
  187. framework to implement new features without hardware dependencies.<o:p></o:p></span></p>
  189. <p><i><span style='font-size:10.0pt;font-family:Verdana'>CadapterCommon </span></i><span
  190. style='font-size:10.0pt;font-family:Verdana'>gives the miniports access to
  191. virtual mixer HW. Also implements the AdapterPowerManagement.<o:p></o:p></span></p>
  193. <p><i><span style='font-size:10.0pt;font-family:Verdana'>CMiniportMSVADTopology</span></i><span
  194. style='font-size:10.0pt;font-family:Verdana'> is the base class for all sample
  195. topologies. It has very basic common functions. Also common topology property
  196. handlers are in this class. The common topology is shown in the below graph.<o:p></o:p></span></p>
  198. <p><span style='font-size:10.0pt;font-family:Verdana'><o:p>&nbsp;</o:p></span></p>
  200. <p><i><span style='font-size:10.0pt;font-family:Verdana'>CMiniportWaveCyclicMSVAD</span></i><span
  201. style='font-size:10.0pt;font-family:Verdana'> is the base class for all sample
  202. wave miniports. It has very basic common functions such as property handlers.<o:p></o:p></span></p>
  204. <p><i><span style='font-size:10.0pt;font-family:Verdana'>CMiniportWaveCyclicStreamMSVAD</span></i><span
  205. style='font-size:10.0pt;font-family:Verdana'> is the base class for all sample
  206. wave streams. It implements a timer-based interrupt mechanism to simulate real
  207. DMA interrupts. Its <i>IDmaAdapter</i> implementation copies data to memory
  208. instead of DMA.<o:p></o:p></span></p>
  210. <p><span style='font-size:10.0pt;font-family:Verdana'>The following list shows
  211. the features implemented in this sample.<o:p></o:p></span></p>
  213. <table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0
  214. style='border-collapse:collapse;border:none;mso-border-alt:solid windowtext .5pt;
  215. mso-padding-alt:0in 5.75pt 0in 5.75pt'>
  216. <tr style='mso-yfti-irow:0'>
  217. <td width=107 valign=top style='width:80.6pt;border:solid windowtext 1.0pt;
  218. mso-border-alt:solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  219. <p><b><span style='font-size:10.0pt;font-family:Verdana'>simple<o:p></o:p></span></b></p>
  220. </td>
  221. <td width=348 valign=top style='width:261.0pt;border:solid windowtext 1.0pt;
  222. border-left:none;mso-border-left-alt:solid windowtext .5pt;mso-border-alt:
  223. solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  224. <p><span style='font-size:10.0pt;font-family:Verdana'>Basic driver with wavecyc
  225. and topology ports<o:p></o:p></span></p>
  226. </td>
  227. </tr>
  228. <tr style='mso-yfti-irow:1'>
  229. <td width=107 valign=top style='width:80.6pt;border:solid windowtext 1.0pt;
  230. border-top:none;mso-border-top-alt:solid windowtext .5pt;mso-border-alt:solid windowtext .5pt;
  231. padding:0in 5.75pt 0in 5.75pt'>
  232. <p><b><span style='font-size:10.0pt;font-family:Verdana'>multistr<o:p></o:p></span></b></p>
  233. </td>
  234. <td width=348 valign=top style='width:261.0pt;border-top:none;border-left:
  235. none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
  236. mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  237. mso-border-alt:solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  238. <p><span style='font-size:10.0pt;font-family:Verdana'>Implements multiple
  239. playback streams<o:p></o:p></span></p>
  240. </td>
  241. </tr>
  242. <tr style='mso-yfti-irow:2'>
  243. <td width=107 valign=top style='width:80.6pt;border:solid windowtext 1.0pt;
  244. border-top:none;mso-border-top-alt:solid windowtext .5pt;mso-border-alt:solid windowtext .5pt;
  245. padding:0in 5.75pt 0in 5.75pt'>
  246. <p><b><span style='font-size:10.0pt;font-family:Verdana'>drmsimp<o:p></o:p></span></b></p>
  247. </td>
  248. <td width=348 valign=top style='width:261.0pt;border-top:none;border-left:
  249. none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
  250. mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  251. mso-border-alt:solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  252. <p><span style='font-size:10.0pt;font-family:Verdana'>Implements DRM for <b>simple</b>.<o:p></o:p></span></p>
  253. </td>
  254. </tr>
  255. <tr style='mso-yfti-irow:3'>
  256. <td width=107 valign=top style='width:80.6pt;border:solid windowtext 1.0pt;
  257. border-top:none;mso-border-top-alt:solid windowtext .5pt;mso-border-alt:solid windowtext .5pt;
  258. padding:0in 5.75pt 0in 5.75pt'>
  259. <p><b><span style='font-size:10.0pt;font-family:Verdana'>drmmult<o:p></o:p></span></b></p>
  260. </td>
  261. <td width=348 valign=top style='width:261.0pt;border-top:none;border-left:
  262. none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
  263. mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  264. mso-border-alt:solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  265. <p><span style='font-size:10.0pt;font-family:Verdana'>Implements DRM for <b>drmsimp</b><o:p></o:p></span></p>
  266. </td>
  267. </tr>
  268. <tr style='mso-yfti-irow:4'>
  269. <td width=107 valign=top style='width:80.6pt;border:solid windowtext 1.0pt;
  270. border-top:none;mso-border-top-alt:solid windowtext .5pt;mso-border-alt:solid windowtext .5pt;
  271. padding:0in 5.75pt 0in 5.75pt'>
  272. <p><b><span style='font-size:10.0pt;font-family:Verdana'>pcmex<o:p></o:p></span></b></p>
  273. </td>
  274. <td width=348 valign=top style='width:261.0pt;border-top:none;border-left:
  275. none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
  276. mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  277. mso-border-alt:solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  278. <p><span style='font-size:10.0pt;font-family:Verdana'>Implements
  279. WAVEFORMATEXTENSIBLE pins<o:p></o:p></span></p>
  280. </td>
  281. </tr>
  282. <tr style='mso-yfti-irow:5'>
  283. <td width=107 valign=top style='width:80.6pt;border:solid windowtext 1.0pt;
  284. border-top:none;mso-border-top-alt:solid windowtext .5pt;mso-border-alt:solid windowtext .5pt;
  285. padding:0in 5.75pt 0in 5.75pt'>
  286. <p><b><span style='font-size:10.0pt;font-family:Verdana'>ac3<o:p></o:p></span></b></p>
  287. </td>
  288. <td width=348 valign=top style='width:261.0pt;border-top:none;border-left:
  289. none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
  290. mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  291. mso-border-alt:solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  292. <p><span style='font-size:10.0pt;font-family:Verdana'>Implements AC3 pins for
  293. playback<o:p></o:p></span></p>
  294. </td>
  295. </tr>
  296. <tr style='mso-yfti-irow:6;mso-yfti-lastrow:yes'>
  297. <td width=107 valign=top style='width:80.6pt;border:solid windowtext 1.0pt;
  298. border-top:none;mso-border-top-alt:solid windowtext .5pt;mso-border-alt:solid windowtext .5pt;
  299. padding:0in 5.75pt 0in 5.75pt'>
  300. <p><b><span style='font-size:10.0pt;font-family:Verdana'>ds2dhw<o:p></o:p></span></b></p>
  301. </td>
  302. <td width=348 valign=top style='width:261.0pt;border-top:none;border-left:
  303. none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
  304. mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
  305. mso-border-alt:solid windowtext .5pt;padding:0in 5.75pt 0in 5.75pt'>
  306. <p><span style='font-size:10.0pt;font-family:Verdana'>Implements DirectSound
  307. 2D HW support.<o:p></o:p></span></p>
  308. </td>
  309. </tr>
  310. </table>
  312. <p><span style='font-size:10.0pt;font-family:Verdana'><o:p>&nbsp;</o:p></span></p>
  314. <h3><span style='font-family:Verdana'>BUILDING THE SAMPLE<o:p></o:p></span></h3>
  316. <p><span style='font-size:10.0pt;font-family:Verdana'>To build this sample,
  317. start DDK build environment and run <b>build</b> from this directory.<o:p></o:p></span></p>
  319. <p><span style='font-size:10.0pt;font-family:Verdana'>This sample can be
  320. installed only manually. To install the sample, run Control Panel-&gt;Add New
  321. Hardware Wizard. Select Media Device Category (Sound, video and game
  322. controllers). Point the wizard to msvad.inf. Setup will give you a list of
  323. MSVAD derivatives with different features. Select one of the drivers and
  324. installation should proceed smoothly.<o:p></o:p></span></p>
  326. <h3><span style='font-family:Verdana'>DRIVER ISSUES<o:p></o:p></span></h3>
  328. <p><span style='font-size:10.0pt;font-family:Verdana'><o:p>&nbsp;</o:p></span></p>
  330. <h3><span style='font-family:Verdana'>CODE TOUR<o:p></o:p></span></h3>
  332. <h4><span style='font-family:Verdana'>File Manifest<o:p></o:p></span></h4>
  334. <pre><u>File<span style='mso-tab-count:2'>���������� </span>Description<o:p></o:p></u></pre><pre><o:p>&nbsp;</o:p></pre><pre>Adapter.cpp<span
  335. style='mso-tab-count:1'>��� </span>Connects the driver with the system</pre><pre>Basedma.cpp<span
  336. style='mso-tab-count:1'>��� </span>IDmaChannel implementation</pre><pre>Basetopo.cpp<span
  337. style='mso-tab-count:1'>�� </span>Base topology class implementation</pre><pre>Basetopo.h<span
  338. style='mso-tab-count:1'>���� </span>Base topology class definition</pre><pre>Basewave.cpp<span
  339. style='mso-tab-count:1'>�� </span>Base wavecyclic class implementation</pre><pre>Basewave.h<span
  340. style='mso-tab-count:1'>���� </span>Base wavecyclic class definition</pre><pre>Common.cpp<span
  341. style='mso-tab-count:1'>���� </span>Common object used by all miniports</pre><pre>Common.h <span
  342. style='mso-tab-count:1'>����� </span>Header file for the common object</pre><pre>Hw.cpp<span
  343. style='mso-tab-count:2'>�������� </span>HW abstraction of MSVAD</pre><pre>Hw.h<span
  344. style='mso-tab-count:2'>���������� </span>HW class definition</pre><pre>Kshelper.cpp<span
  345. style='mso-tab-count:1'>�� </span>Kernel Streaming utility function implementations</pre><pre>Kshelper.h<span
  346. style='mso-tab-count:1'>���� </span>Kernel Streaming utility function definitions</pre><pre>Msvad.h<span
  347. style='mso-tab-count:2'>������� </span>Common definitions</pre><pre>Msvad.inf<span
  348. style='mso-tab-count:1'>����� </span>Installation inf for this sample</pre><pre>Msvad.rc<span
  349. style='mso-tab-count:1'>������ </span>Common resource file</pre><pre>Readme.htm<span
  350. style='mso-tab-count:1'>���� </span>The documentation for this driver (this file)</pre><pre>Savedata.cpp<span
  351. style='mso-tab-count:1'>�� </span>Writes PCM data to disk.</pre><pre>Savedata.h<span
  352. style='mso-tab-count:1'>���� </span>Definition of CsaveData class.</pre><pre>Sources.inc<span
  353. style='mso-tab-count:1'>��� </span>Common sources file included by all sample drivers.</pre><pre><o:p>&nbsp;</o:p></pre>
  355. <p align=center style='text-align:center;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><a
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  370. style='font-size:7.5pt;font-family:"MS Sans Serif"'>� Microsoft Corporation
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