jmfglossary.html

jmf指导文件参考资料

<dl>
  <dt> <a name="95666"> </a><font face="Palatino, Times New Roman, Times, serif"><code>The Player</code> state in which the <code>Player</code> knows what resources it needs and information about the type of media it is to present. A <em>Realized</em> <code>Player</code> knows how to render its data and can provide visual components and controls. Its connections to other objects in the system are in place, but it doesn't own any resources that would prevent another <code>Player</code> from starting.</font>
</dl>

<p>
  <a name="93896"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>realizing</strong></font>
</p>

<dl>
  <dt> <a name="95683"> </a><font face="Palatino, Times New Roman, Times, serif"><code>The Player</code> state in which the <code>Player</code> is determining what resources it needs and gathering information about the type of media it is to present. </font>
</dl>

<p>
  <a name="93897"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>render</strong></font>
</p>

<dl>
  <dt> <a name="95708"> </a><font face="Palatino, Times New Roman, Times, serif">Deliver media data to some destination, such as a monitor or speaker.</font>
</dl>

<p>
  <a name="93898"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>Renderer</strong></font>
</p>

<dl>
  <dt> <a name="95709"> </a><font face="Palatino, Times New Roman, Times, serif">A JMF plug-in that delivers media data to some destination, such as a monitor or speaker.</font>
</dl>

<p>
  <a name="97278"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>RTCP</strong></font>
</p>

<dl>
  <dt> <a name="97315"> </a><font face="Palatino, Times New Roman, Times, serif">RTP Control Protocol.</font>
</dl>

<p>
  <a name="97314"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>RTP</strong></font>
</p>

<dl>
  <dt> <a name="97279"> </a><font face="Palatino, Times New Roman, Times, serif">Real-time Transfer Protocol.</font>
</dl>

<p>
  <a name="97308"> </a><font face="Palatino, Times New Roman, Times, serif">session</font>
</p>

<dl>
  <dt> <a name="97309"> </a><font face="Palatino, Times New Roman, Times, serif">In RTP, the association among a set of participants communicating with RTP. A session is defined by a network address plus a port pair for RTP and RTCP.</font>
</dl>

<p>
  <a name="94037"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>source</strong></font>
</p>

<dl>
  <dt> <a name="97373"> </a><font face="Palatino, Times New Roman, Times, serif">A provider of a stream of media data.</font>
</dl>

<p>
  <a name="93900"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>SourceStream</strong></font>
</p>

<dl>
  <dt> <a name="97374"> </a><font face="Palatino, Times New Roman, Times, serif">A single stream of media data.</font>
</dl>

<p>
  <a name="97297"> </a><font face="Palatino, Times New Roman, Times, serif">SSRC</font>
</p>

<dl>
  <dt> <a name="97298"> </a><font face="Palatino, Times New Roman, Times, serif">See synchronization source.</font>
</dl>

<p>
  <a name="95737"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>start</strong></font>
</p>

<dl>
  <dt> <a name="97635"> </a><font face="Palatino, Times New Roman, Times, serif">Activate a <code>Player</code>. A <em>Started</em> <code>Player's</code> time-base time and media time are mapped and its clock is running, though the <code>Player</code> might be waiting for a particular time to begin presenting its media data.</font>
</dl>

<p>
  <a name="97636"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>start latency</strong></font>
</p>

<dl>
  <dt> <a name="97637"> </a><font face="Palatino, Times New Roman, Times, serif">The time it takes before a <code>Player</code> can begin presenting media data.</font>
</dl>

<p>
  <a name="93904"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>started</strong></font>
</p>

<dl>
  <dt> <a name="97375"> </a><font face="Palatino, Times New Roman, Times, serif">One of the two fundamental Clock states. (The other is <em>Stopped</em>.) <code>Controller</code> breaks the <code>Started</code> state down into several resource allocation phases: <em>Unrealized</em>, <em>Realizing</em>, <em>Realized</em>, <em>Prefetching</em>, and <em>Prefetched</em>.</font>
</dl>

<p>
  <a name="94564"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>status change events</strong></font>
</p>

<dl>
  <dt> <a name="94565"> </a><font face="Palatino, Times New Roman, Times, serif"><code>Controller</code> events such as <code>RateChangeEvent</code>, <code>SizeChangeEvent</code> <code>StopTimeChangeEvent</code> that indicate that the status of a <code>Controller</code> has changed.</font>
</dl>

<p>
  <a name="93905"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>stop</strong></font>
</p>

<dl>
  <dt> <a name="95761"> </a><font face="Palatino, Times New Roman, Times, serif">Halt a <code>Player's</code> presentation of media data.</font>
</dl>

<p>
  <a name="93906"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>stop time</strong></font>
</p>

<dl>
  <dt> <a name="95762"> </a><font face="Palatino, Times New Roman, Times, serif">The media time at which a <code>Player</code> should halt.</font>
</dl>

<p>
  <a name="97301"> </a><font face="Palatino, Times New Roman, Times, serif">synchronization source</font>
</p>

<dl>
  <dt> <a name="97302"> </a><font face="Palatino, Times New Roman, Times, serif">The source of a stream of RTP packets, identified by a 32-bit numeric SSRC identifier carried in the RTP header.</font>
</dl>

<p>
  <a name="93907"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>synchronize</strong></font>
</p>

<dl>
  <dt> <a name="95763"> </a><font face="Palatino, Times New Roman, Times, serif">Coordinate two or more Controller's so that they can present media data together. Synchronized Controller's use the same <code>TimeBase</code>.</font>
</dl>

<p>
  <a name="93908"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>target state</strong></font>
</p>

<dl>
  <dt> <a name="95776"> </a><font face="Palatino, Times New Roman, Times, serif">The state that a <code>Player</code> is heading toward. For example, when a <code>Player</code> is in the <em>Realizing</em> state, its target state is <em>Realized</em>.</font>
</dl>

<p>
  <a name="93909"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>time-based media</strong></font>
</p>

<dl>
  <dt> <a name="93952"> </a><font face="Palatino, Times New Roman, Times, serif">Media such as audio, video, MIDI, and animations that change with respect to time. </font>
</dl>

<p>
  <a name="95796"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>TimeBase</strong></font>
</p>

<dl>
  <dt> <a name="95812"> </a><font face="Palatino, Times New Roman, Times, serif">An object that defines the flow of time for a <code>Controller</code>. A <code>TimeBase</code> is a constantly ticking source of time, much like a crystal.</font>
</dl>

<p>
  <a name="95798"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>time-base time</strong></font>
</p>

<dl>
  <dt> <a name="95801"> </a><font face="Palatino, Times New Roman, Times, serif">The current time returned by a <code>TimeBase</code>.</font>
</dl>

<p>
  <a name="93912"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>track</strong></font>
</p>

<dl>
  <dt> <a name="94106"> </a><font face="Palatino, Times New Roman, Times, serif">A channel in a multiplexed media stream that contains media or control data. For example, a multiplexed media stream might contain an audio track and a video track. </font>
</dl>

<p>
  <a name="93913"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>TrackControl</strong></font>
</p>

<dl>
  <dt> <a name="95830"> </a><font face="Palatino, Times New Roman, Times, serif">A <code>Control</code> used to query, control and manipulate the data of individual media tracks. </font>
</dl>

<p>
  <a name="94335"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>track format</strong></font>
</p>

<dl>
  <dt> <a name="94336"> </a><font face="Palatino, Times New Roman, Times, serif">The format associated with a particular track. </font>
</dl>

<p>
  <a name="93914"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>transcode</strong></font>
</p>

<dl>
  <dt> <a name="95842"> </a><font face="Palatino, Times New Roman, Times, serif">Convert a data stream from an uncompressed type to a compressed type or vice-versa.</font>
</dl>

<p>
  <a name="93915"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>transition events</strong></font>
</p>

<dl>
  <dt> <a name="95856"> </a><font face="Palatino, Times New Roman, Times, serif"><code>ControllerEvents</code> posted by a <code>Controller</code> as its state changes. </font>
</dl>

<p>
  <a name="97352"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>unicast</strong></font>
</p>

<dl>
  <dt> <a name="97353"> </a><font face="Palatino, Times New Roman, Times, serif">Transmit a data stream to a single recipient.</font>
</dl>

<p>
  <a name="93917"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>unrealized</strong></font>
</p>

<dl>
  <dt> <a name="95869"> </a><font face="Palatino, Times New Roman, Times, serif">The initial state of a <code>Player</code>. A <code>Player</code> in the <em>Unrealized</em> state has been instantiated, but does not yet know anything about its media. </font>
</dl>

<p>
  <a name="93918"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>URL</strong></font>
</p>

<dl>
  <dt> <a name="95880"> </a><font face="Palatino, Times New Roman, Times, serif">Universal Resource Locator.</font>
</dl>

<p>
  <a name="94848"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>user-interface component</strong></font>
</p>

<dl>
  <dt> <a name="95886"> </a><font face="Palatino, Times New Roman, Times, serif">An instance of a class that implements the <code>Component</code> interface. JMF <code>Players</code> have two types of default user-interface components, a <code>ControlPanelComponent</code> and a <code>VisualComponent</code>.</font>
</dl>

<p>
  <a name="93921"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>visual component</strong></font>
</p>

<dl>
  <dt> <a name="94343"> </a><font face="Palatino, Times New Roman, Times, serif">The user interface component that displays the media or information about the media.</font>
</dl>

<p>
  <a name="93922"> </a><font face="Palatino, Times New Roman, Times, serif"><strong>VOD </strong></font>
</p>

<dl>
  <dt> <a name="95883"> </a><font face="Palatino, Times New Roman, Times, serif">Video on Demand.</font>
</dl>
</blockquote>
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