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33 lines
1.7 KiB
Text
33 lines
1.7 KiB
Text
This paper will present the GStreamer Media framework. We
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explain briefly what a media framework is and what its advantages
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are. This introduction presents the basic design of GStreamer
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and how the modularity can provide many benefits when building
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multimedia applications ranging from simple audio/video players
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to complex audio/video mixing and non linear editing.
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We then go into more detail about the different components of
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the framework and how specific problems were solved.
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State changes are covered first as they bring the pipeline with
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all its components from a sleeping to a running state. The most
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interesting problem here is error recovery and thread interlocking.
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We expand on the scheduler that is responsible for making sure all
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of the components don't step on eachothers toes as they pass along
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data. We explain one of the possible scheduling methods using
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cothreads and expand on how the number of cothread switches can
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be reduced in order to make the data flow as fast as possible.
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Since GStreamer is a very open system that can basically handle
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any media type, a mechanism is provided to negotiate the media
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types between plugins. We continue with an explanation of how
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this type negotiation is done.
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Events are the mechanism to indicate changes in the data that is
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flowing through the pipeline, such as End Of Stream notification
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or seek and flush events. We explain how these events work and
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how they interact with the scheduler.
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We finally cover some of the interesting libraries that are
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provided with GStreamer, such as the bytestream library. We
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explain how all the pieces fit together and how we combine different
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techniques to create a very fast read API.
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