📄 音频缓冲区的设置 - netwarning的专栏 - csdnblog.htm
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<P>设置音频数据捕获(capture)和提交(render)缓冲区的数值</P>
<P>问题:</P>
<P>
给音频信息的捕获和提交设置缓冲区数值.小一些的缓冲区会减少时钟周期,但是也会增加传输的次数.这些书只需要在不同的系统上测试.</P>
<P>解决方案:</P>
<P>
音频缓冲区控制(AudioBufferControl)包含于数据源(DataSource)和播放器(Player)中.捕获音频缓冲区数值(Capture
Buffer Size)由数据</P>
<P>源控制,提交缓冲区数值(render buffer size)由播放器控制.</P>
<P> requirements<BR> related
classes<BR> how to run this sample<BR>
source code</P>
<P> requirements</P>
<P>
平台
JDK 1.1.6 或更高版本<BR> JMF
API: 2.0
或更高版本<BR> Implementation
AJ(All Java),WPP(Windows Performance Pack),SPP(Solaris Performance Pack)</P>
<P> 相关的类</P>
<P> javax.media.Player<BR>
javax.media.control.BufferControl</P>
<P><BR> 如何执行这个例子</P>
<P> java AudioBufferControl [-c <capture buf size in
millisecs>] [-r <render buf size in millisecs>] <URL> </P>
<P> 例如: java AudioBufferControl -c 62 -r 400
javasound://44100 </P>
<P> 代码</P>
<P> </P>
<P><BR>import java.awt.*;<BR>import javax.media.*;<BR>import
javax.media.control.TrackControl;<BR>import
javax.media.control.BufferControl;<BR>import javax.media.format.*;<BR>import
javax.media.protocol.*;<BR>import javax.media.protocol.DataSource;</P>
<P><BR>/**<BR> * Sample program to playback the input URL and set the audio
capture <BR> * and rendering buffer sizes.<BR> */<BR>public class
AudioBufferControl extends Frame implements ControllerListener {</P>
<P> Processor p;<BR> Object waitSync = new
Object();<BR> boolean stateTransitionOK = true;</P>
<P> /**<BR> * Given a DataSource,
create a processor and use that processor<BR> * as a
player to playback the media.<BR>
*/<BR> public boolean open(DataSource ds, int captureBufSize,
int renderBufSize) {</P>
<P> System.err.println("create processor for: " + ds.getContentType());</P>
<P> // Check to see if there's a buffer control on the data
source.<BR> // It could be that we are using a capture data
source.<BR> Control c =
(Control)ds.getControl("javax.media.control.BufferControl");<BR> if (c !=
null)<BR>
((BufferControl)c).setBufferLength(captureBufSize);</P>
<P> try {<BR> p =
Manager.createProcessor(ds);<BR> } catch (Exception e)
{<BR> System.err.println("Failed to create a processor
from the given DataSource: " + e);<BR> return
false;<BR> }</P>
<P> p.addControllerListener(this);</P>
<P> // Put the Processor into configured
state.<BR> p.configure();<BR> if (!waitForState(p.Configured))
{<BR> System.err.println("Failed to configure the
processor.");<BR> return false;<BR> }</P>
<P> // So I can use it as a
player.<BR> p.setContentDescriptor(null);</P>
<P> p.realize();<BR> if (!waitForState(p.Realized))
{<BR> System.err.println("Failed to realize the
processor.");<BR> return false;<BR> }</P>
<P> // After the processor has been realized, we can now set
the<BR> // renderer's buffer size. We need to do this before
the<BR> // processor is prefetched.<BR> // We need to loop the array
of controls to make sure that we <BR> // are setting the size of the
correct buffer control since<BR> // the DataSource's controls are also
included in the list.<BR> Control cs[] = p.getControls();<BR> Object
owner;</P>
<P> for (int i = 0; i < cs.length; i++) {<BR> if
(cs[i] instanceof Owned && cs[i] instanceof BufferControl)
{<BR> owner = ((Owned)cs[i]).getOwner();<BR> if (owner
instanceof Renderer) {<BR>
((BufferControl)cs[i]).setBufferLength(renderBufSize);<BR> }<BR>
}<BR> }</P>
<P> // Prefetch the processor.<BR> p.prefetch();<BR> if
(!waitForState(p.Prefetched)) {<BR>
System.err.println("Failed to prefetch the
processor.");<BR> return false;<BR> }</P>
<P> // Display the visual & control component if there's one.</P>
<P> setLayout(new BorderLayout());</P>
<P> Component cc;</P>
<P> Component vc;<BR> if ((vc = p.getVisualComponent()) != null)
{<BR> add("Center", vc);<BR> }</P>
<P> if ((cc = p.getControlPanelComponent()) != null)
{<BR> add("South", cc);<BR> }</P>
<P> // Start the processor.<BR> p.start();</P>
<P> setVisible(true);</P>
<P> return true;<BR> }</P>
<P> public void addNotify()
{<BR> super.addNotify();<BR> pack();<BR> }</P>
<P> /**<BR> * Block until the
processor has transitioned to the given state.<BR> *
Return false if the transition failed.<BR>
*/<BR> boolean waitForState(int state) {<BR> synchronized
(waitSync) {<BR> try {<BR> while
(p.getState() < state &&
stateTransitionOK)<BR>
waitSync.wait();<BR> } catch (Exception e)
{}<BR> }<BR> return stateTransitionOK;<BR> }</P>
<P><BR> /**<BR> * Controller
Listener.<BR> */<BR> public void
controllerUpdate(ControllerEvent evt) {</P>
<P> if (evt instanceof ConfigureCompleteEvent
||<BR> evt instanceof RealizeCompleteEvent
||<BR> evt instanceof PrefetchCompleteEvent)
{<BR> synchronized (waitSync)
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