Generating Live Audio/Video Data
[Custom DataSource]
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Problem
How to generate live audio/video data that can be played back using
JMF. This can include translating data received through a non-standard
protocol to a format that JMF can recognize. For example, you could be
receiving data from a hardware device not supported by JMF. Or you could
be using a proprietary protocol that receives packetized audio/video data
through an ATM network.
Solution
This solution shows you how to create a custom PushBufferDataSource,
which is new to JMF2.0. A PushBufferDataSource contains streams
of type PushBufferStream. Such a stream typically generates audio/video
data that is organized as frames, rather than a continuous stream of bytes.
So each Buffer object carries an entire frame of video or
a good sized chunk of audio (anywhere between say 25 millisecs to 2 seconds
worth). The data can be in a compressed or uncompressed format. The stream
needs to advertise the Format of its data through the getFormat
method.
The sample code includes two classes - one is a subclass of PushBufferDataSource
and the other is an implementation of PushBufferStream. By default
the stream generated is a video stream of raw RGB data. You can change
the videoData variable in LiveStream.java to false
to generate audio data instead.
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| Requirements |
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| Platform: |
JDK 1.1.6 or later |
| JMF API: |
2.0 or later |
| Implementation: |
AJ, WPP, SPP* |
| Other software requirements: |
Swing 1.1 |
* AJ = All Java, WPP = Windows Performance Pack, SPP =
Solaris Performance Pack |
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| Related Classes |
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| How to run this sample |
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Download the source code and compile it :
javac -d . DataSource.java LiveStream.java
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Register the package prefix for the new data source using JMFRegistry
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Run JMFRegistry
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In the Protocol Prefix List section add "jmfsample" and hit Commit.
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Run JMStudio.
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Select File->Open URL and enter "live:"
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You should now see a video screen with a blue band scrolling up.
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| Source Code |
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