Created by the British Broadcasting Corporation.
#include <seq_compress.h>
Collaboration diagram for dirac::SequenceCompressor:
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Creates a sequence compressor, and prepares to begin compressing with the first frame.Sets up frame padding in the picture input if necesary
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Destructor. Must delete IO objects created by constructor. |
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Copy constructor is private and body-less. This class should not be copied. |
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Uses the GOP parameters to convert frame numbers in coded order to display order
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This function codes the next frame in coding order and returns the next frame in display order. In general these will differ, and because of re-ordering there is a delay which needs to be imposed. This creates problems at the start and at the end of the sequence which must be dealt with. At the start we just keep outputting frame 0. At the end you will need to loop for longer to get all the frames out. It's up to the calling function to do something with the decoded frames as they come out -- write them to screen or to file, for example. . If coding is fast enough the compressed version could be watched real-time (with suitable buffering in the calling function to account for encode-time variations). NOTE: LoadNextFrame must be called atleast once before invoking this method.
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Indicates whether or not the last frame in the sequence has been compressed.
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Load one frame of data into the Sequence Compressor. Sets m_all_done to true if no more data is available to be loaded.
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Assignment = is private and body-less. This class should not be assigned.. |
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This contains all the block information used for motion compensation. However, temporal prediction structures are defined via the frame headers, and so a simple GOP need not be used or, if so, can be altered on the fly. |
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Flag which is false if we've been all-done for more than one frame, true otherwise (so that we can take actions on finishing once only). |
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© 2004 British Broadcasting Corporation.
Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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