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32 lines
1.2 KiB
Text
32 lines
1.2 KiB
Text
<chapter id="cha-queues">
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<title>Queues</title>
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<para>
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A <classname>GstQueue</classname> is a filter element.
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Queues can be used to connect two elements in such way that the data can
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be buffered.
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</para>
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<para>
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A buffer that is sinked to a Queue will not automatically be pushed to the
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next connected element but will be buffered. It will be pushed to the next
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element as soon as gst_connection_push () is called.
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</para>
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<para>
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Queues are mostly used in conjunction with a <classname>GstThread</classname> to
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provide an external connection for the thread elements. You could have one
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thread feeding buffers into a <classname>GstQueue</classname> and another
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thread repeadedly calling gst_connection_push () on the queue to feed its
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internal elements.
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</para>
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<para>
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Below is a figure of a two-threaded decoder. We have one thread (the main execution
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thread) reading the data from a file, and another thread decoding the data.
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</para>
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<figure float="1" id="sec-queues-img">
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<title>a two-threaded decoder with a queue</title>
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<graphic fileref="images/queue" format="png"></graphic>
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</figure>
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</chapter>
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