?? directshow幫助文檔學習筆記之directshow幫助文檔學習總結 - zhangxinbin的專欄 - csdnblog.htm
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style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，而</SPAN><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><FONT
face="Times New Roman">IBaseFilter</FONT></SPAN></STRONG><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">又繼承自</SPAN><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US><FONT
face="Times New Roman">IMediaFilter</FONT></SPAN></STRONG><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></FONT></P>
<P class=MsoNormal
style="MARGIN: 7.8pt 0cm; mso-para-margin-top: .5gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: .5gd; mso-para-margin-left: 0cm"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋體; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: 宋體; mso-font-kerning: 0pt"><O:P><FONT
size=3></FONT></O:P></SPAN></P>
<P class=MsoNormal
style="MARGIN: 7.8pt 0cm; TEXT-INDENT: 21pt; mso-para-margin-top: .5gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: .5gd; mso-para-margin-left: 0cm"><SPAN
style="FONT-FAMILY: 宋體; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: 宋體; mso-font-kerning: 0pt"><FONT
size=3>下面的內容直接摘自幫助文檔，它們是相當重要的。<SPAN
lang=EN-US><O:P></O:P></SPAN></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 7.8pt 0cm; mso-para-margin-top: .5gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: .5gd; mso-para-margin-left: 0cm"><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt; FONT-FAMILY: 宋體; mso-bidi-font-family: 宋體; mso-font-kerning: 0pt"><A
title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager<O:P></O:P></SPAN></STRONG></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><FONT
size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 1"> </SPAN>The <A
title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager builds and controls <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A>
graphs. This object is the central component in <A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>.
Applications use it to build and control <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A>
graphs. The <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager also handles synchronization, event notification, and other aspects of
the controlling the <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>.
Create this object by calling CoCreateInstance.</FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><O:P><FONT
face="Times New Roman" size=3></FONT></O:P></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><FONT face="Times New Roman"><A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
Filters<O:P></O:P></FONT></SPAN></STRONG></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3><A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
provides a set of default filters that install automatically with Microsoft? <A
title=Windows
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Windows">Windows</A>?.
These filters support many data formats while providing a high degree of
hardware independence. An application can also register and install custom
filters on the target system.</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>The ACM Wrapper, AVI Decompressor
and AVI Compressor filters work with the Audio and Video Compression Managers to
enable various codecs to be used in a <A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
<A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>.</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>All the filters supported by the
<A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
Software Development Kit (SDK) are listed here. If a <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A>
appears in GraphEdit but is not documented in this reference section, it means
the <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> has
either been installed by a third party or else is used internally by some other
Microsoft technology such as <A title=Windows
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Windows">Windows</A>
Media? Player or TAPI. Such filters are not supported by the <A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
SDK.</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><O:P><FONT
face="Times New Roman" size=3></FONT></O:P></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><FONT
face="Times New Roman">Interfaces<O:P></O:P></FONT></SPAN></STRONG></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>This topic contains reference
information for the Microsoft? <A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>?
core interfaces. To provide broad support for various types of hardware, file
formats, and stream operations, implements a large number of interfaces. Some
are used by applications; others are used internally by filters and other <A
title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
components.</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><O:P><FONT
face="Times New Roman" size=3></FONT></O:P></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><FONT face="Times New Roman"><A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A>
Categories<O:P></O:P></FONT></SPAN></STRONG></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>The following tables list the
CLSIDs for the standard <A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
<A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A>
categories. To enumerate the filters in a given category, pass the corresponding
CLSID to the ICreateDevEnum::CreateClassEnumerator method. These categories also
appear in GraphEdit when you choose Insert Filters from the <A title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A> menu.
</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><O:P><FONT
face="Times New Roman" size=3></FONT></O:P></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><FONT face="Times New Roman">DVD Event Notification
Codes<O:P></O:P></FONT></SPAN></STRONG></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>Note<SPAN
style="mso-spacerun: yes"> </SPAN>This introductory material applies
only to C++ developers. </FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>Microsoft? <A title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>?
supports system-defined events, which filters in the <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A> pass
to the <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
manager. Filters pass these events to the <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
manager by using the IMediaEventSink::Notify method, and the application
retrieves them with the IMediaEvent::GetEvent method. </FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>When you retrieve an event by
calling GetEvent, the event can contain interface pointers or pointers to
allocated memory. Code that uses GetEvent should, therefore, call
IMediaEvent::FreeEventParams to free any resources associated with the event's
parameters after it handles the event. </FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>The DVD event notification codes
are listed in Dvdevcod.h. See Event Notification Codes for non-DVD event
notification codes. The following list shows the available DVD event
notification codes in alphabetical order. </FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><O:P><FONT
face="Times New Roman" size=3></FONT></O:P></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><STRONG
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt"><FONT face="Times New Roman">Event Notification
Codes<O:P></O:P></FONT></SPAN></STRONG></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>This sections lists the <A
title=DirectShow
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/DirectShow">DirectShow</A>
events that are not specific to DVD. For events specific to DVD, see DVD Event
Notification Codes.</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>Filters send events to the <A
title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager by calling the IMediaEventSink::Notify method. The <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager handles some events and queues others for the application. The
application retrieves them by calling the IMediaEvent::GetEvent method.
</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>In the sections that follow, each
entry lists the event code, the meaning of the event parameters, and the <A
title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager's default action for the event, if any. To override the default action,
call IMediaEvent::CancelDefaultHandling. Event codes are defined in the header
files Evcode.h and Audevcod.h. If there is no default action, the <A
title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager automatically forwards the event to the application (through the event
queue). </FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><FONT
face="Times New Roman" size=3>Custom Events</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>Filters can define custom events
with event codes in the range EC_USER and higher. The <A title=Filter
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Filter">Filter</A> <A
title=Graph
href="http://blog.csdn.net/zhangxinbin/archive/2006/10/22/Graph">Graph</A>
Manager will place these directly in the event queue. However, the following
caveats apply: </FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 42pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo1; tab-stops: list 42.0pt"><SPAN
lang=EN-US
style="FONT-FAMILY: Wingdings; mso-bidi-font-family: Wingdings; mso-fareast-font-family: Wingdings"><SPAN
style="mso-list: Ignore"><FONT size=3>l</FONT><SPAN
style="FONT: 7pt 'Times New Roman'">
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