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<div class=Section1>
<h2><span style='font-family:Verdana'>AC97 WDM Audio Driver Sample<o:p></o:p></span></h2>
<p><span style='font-size:10.0pt;font-family:Arial;color:red'>[This is
preliminary documentation and subject to change.]</span><span style='font-size:
10.0pt;font-family:Verdana'><o:p></o:p></span></p>
<h3><span style='font-family:Verdana'>SUMMARY<o:p></o:p></span></h3>
<p><span style='font-size:10.0pt;font-family:Verdana'>This sample driver
demonstrates the basics of writing a WDM audio driver. The sample driver should
work with any AC97 codec connected to an Intel<65> motherboard with integrated
AC97 controller, like the Intel 810 Chipset. The sample driver supports multi
channel audio and builds a mixer topology depending on the AC97 codec in the
system.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>Its functionality may be
expanded for non-AC97 design features or to convert the driver to use a
different DMA engine. For more information, please see the "Driver
Issues" section below. <o:p></o:p></span></p>
<h3><span style='font-family:Verdana'>BUILDING THE SAMPLE<o:p></o:p></span></h3>
<p><span style='font-size:10.0pt;font-family:Verdana'>To build this sample,
enter any Windows .NET or Windows XP build environment and run <b>build</b><b
style='mso-bidi-font-weight:normal'> <20><span class=SpellE>cZ</span></b> from the
AC97 directory (parent directory).</span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>The INF file named
<0A>AC97smpl.inf<6E> included in the AC97 subdirectory (parent directory) can be used
to install the sample driver after it has been built. Simply copy the INF and
the driver binary to a floppy disk and then update the driver for the device
with the one from the floppy. Note however, that the INF file tries to install
the <span class=SpellE>proppage</span> sample and may want additional binaries.
Please refer to the <20><span class=SpellE>readme</span><3E> in the parent directory
for more information.<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>Once the driver has been
installed with the INF, the driver may be updated by copying the binary into
%SystemRoot%\System32\Drivers on the target machine and rebooting to test the
new driver, provided that there are no INF changes.<o:p></o:p></span></p>
<h3><span style='font-family:Verdana'>DRIVER ISSUES<o:p></o:p></span></h3>
<p><span style='font-size:10.0pt;font-family:Verdana'>1. At the time of
writing, there is no AC97 implementation available for Alpha or IA64
machines<65>therefore, the DDK sample source does not install on Alpha or IA64 machines.
<o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>2. This driver supports
the old Intel 810/820/840 implementation as well as the new Intel 815/820
implementation (82801BA/BAM). This new chipset supports multi channel AC97 <span
class=SpellE>codecs</span>, but the sample driver will only run satisfactorily
with 100% AC97 compatible <span class=SpellE>codecs</span>. The double data
rate playback (96KHz, for example) feature is unsupported by those chipsets and
therefore also in the driver. <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>3. The AC97 low-priority
Microphone recording capability is disabled. You can record using Microphone as
you would record from any other source (for example, a CD) using the normal
recording selector, but the second recording line that is optionally defined in
the AC97 specification is disabled. <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>4. The AC97 inputs
reported to the operating system may be disabled through the INF. The INF has a
section where you can disable specific input lines of the codec that are not
attached to any adapters. <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>5. This driver works with
Microsoft<66> Windows<77> 2000 (or later) and Microsoft Windows 98 Second Edition (or
later) only. It will neither run nor install on the original release of
Microsoft Windows 98. <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>6. Due to HW constrains
in the Intel 440MX chipset, this driver cannot run reliably on this chipset.
Therefore, please do not add PnP IDs that contain PCI\VEN_8086&DEV_7195.<o:p></o:p></span></p>
<h3><span lang=FR style='font-family:Verdana;mso-ansi-language:FR'>CODE TOUR<o:p></o:p></span></h3>
<h4><span lang=FR style='font-family:Verdana;mso-ansi-language:FR'>File
Manifest<o:p></o:p></span></h4>
<pre><u><span lang=FR style='mso-ansi-language:FR'>File<span style='mso-tab-count:
2'><3E><><A0><A0><A0><A0><A0><A0><A0><A0> </span>Description<o:p></o:p></span></u></pre><pre><span lang=FR
style='mso-ansi-language:FR'><o:p> </o:p></span></pre><pre>Ac97reg.h<span style='mso-spacerun:yes'><3E><> </span><span
style='mso-tab-count:1'><3E><> </span>Definition of the AC97 registers</pre><pre>Ac97smpl.inf<span
style='mso-tab-count:1'><3E><> </span>Setup information</pre><pre>Ac97smpl.rc <span
style='mso-tab-count:1'><3E><> </span>Resource file containing version information</pre><pre><span
class=SpellE>Adapter.cpp</span> <span style='mso-tab-count:1'><3E><> </span>Connects driver with the system</pre><pre><span
class=SpellE>Adapter.h</span><span style='mso-spacerun:yes'><3E><> </span><span
style='mso-tab-count:1'><3E><> </span>Header file for <span class=SpellE>adapter.cpp</span></pre><pre><span
class=SpellE>Common.cpp</span><span style='mso-spacerun:yes'><3E> </span><span
style='mso-tab-count:1'><3E><> </span>Common object used by all <span class=SpellE>miniports</span></pre><pre><span
class=SpellE>Common.h</span><span style='mso-spacerun:yes'><3E><><A0> </span><span
style='mso-tab-count:1'><3E><> </span>Header file for the common object</pre><pre><span
class=SpellE>Debug.h</span><span style='mso-spacerun:yes'><3E><><A0><A0> </span><span
style='mso-tab-count:1'><3E><> </span>Debug output support</pre><pre><span
class=SpellE>Guids.h</span><span style='mso-spacerun:yes'><3E><><A0><A0> </span><span
style='mso-tab-count:1'><3E><> </span>Private <span class=SpellE>GUIDs</span> used by the driver (like name definitions)</pre><pre><span
class=SpellE>Ichreg.h</span><span style='mso-spacerun:yes'><3E><><A0> </span><span
style='mso-tab-count:1'><3E><> </span>Defines the registers of the INTEL AC97 interface (ICH)</pre><pre><span
class=SpellE>Ichwave.cpp</span> <span style='mso-tab-count:1'><3E><> </span>Implementation of the stream object (DMA programming)</pre><pre><span
class=SpellE>Ichwave.h</span><span style='mso-spacerun:yes'><3E><> </span><span
style='mso-tab-count:1'><3E><> </span>Header file for the stream object</pre><pre><span
class=SpellE>Makefile</span><span style='mso-spacerun:yes'><3E><><A0> </span><span
style='mso-tab-count:1'><3E><> </span>Standard Windows NT <span class=SpellE>makefile</span></pre><pre><span
class=SpellE>Mintopo.cpp</span> <span style='mso-tab-count:1'><3E><> </span>Implementation of the topology miniport</pre><pre><span
class=SpellE>Mintopo.h</span><span style='mso-spacerun:yes'><3E><> </span><span
style='mso-tab-count:1'><3E><> </span>Header file for the topology miniport</pre><pre><span
class=SpellE>Minwave.cpp</span> <span style='mso-tab-count:1'><3E><> </span>Implementation of the wave PCI miniport</pre><pre><span
class=SpellE>Minwave.h</span><span style='mso-spacerun:yes'><3E><> </span><span
style='mso-tab-count:1'><3E><> </span>Header file for the wave PCI miniport</pre><pre><span
class=SpellE>Prophnd.cpp</span> <span style='mso-tab-count:1'><3E><> </span>Implementation of the property handler (part of the topology miniport)</pre><pre>Readme.htm<span style='mso-spacerun:yes'><3E> </span><span
style='mso-tab-count:1'><3E><> </span>Documentation for this sample (this file)</pre><pre><span
class=SpellE>Shared.h</span><span style='mso-spacerun:yes'><3E><><A0> </span><span
style='mso-tab-count:1'><3E><> </span>Header file shared by every C++ source file</pre><pre>Sources<span style='mso-spacerun:yes'><3E><><A0><A0> </span><span
style='mso-tab-count:1'><3E><> </span>Dependency information for compiling</pre><pre><o:p> </o:p></pre>
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<pre><o:p> </o:p></pre><pre><o:p> </o:p></pre>
<p style='margin:0in;margin-bottom:.0001pt;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'><span
style='font-size:7.5pt;font-family:"MS Sans Serif";mso-fareast-font-family:
"Courier New";mso-bidi-font-family:"Courier New"'><3E> Microsoft Corporation 1999</span><span
style='font-size:10.0pt;font-family:Verdana;mso-fareast-font-family:"Courier New";
mso-bidi-font-family:"Courier New"'> <o:p></o:p></span></p>
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