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64 lines
2.1 KiB
Plaintext
64 lines
2.1 KiB
Plaintext
File: Plugin mad for vlc is based upon libmad from the mad distribution.
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Author: Jean-Paul Saman <jpsaman@wxs.nl>
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Directories:
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============
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vlc/plugins/mad : mad audio decoder plugin for vlc
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Interface functions
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===================
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The following interface functions are implemented in the mad plugin.
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decoder_Probe : vlc probes for plugin capabilities
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decoder_Run : vlc starts a decoder plugin by calling this function
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InitThread : routine to do some initializations
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EndThread : cleanup function
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The following functions are callback functions for the mad decoder library:
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libmad_input : called when input data is needed
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libmad_output : called whenever a frame has been decoded
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libmad_header : called upon decoding of only a frame header
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libmad_messages : libmad messages
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libmad_error : called whenever an error occurred during the decoding process
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Design: (ASCII art)
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=======
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It represents the function call flow viewed from the vlc main program. The main program is in charge of allocating decoders,
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initializing, starting and stopping them.
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---------------
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| <library> |
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| libmad |
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---------------
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^
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---------------
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| <plugin> |
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| mad |
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_______________
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^
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________________________
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| <decoder interface> |
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| vlc plugin interface |
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________________________
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Interface view:
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===============
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[mad decoder plugin]
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----------------------
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vlc decoder interface -> | mad_adec mad_libmad | -> libmad
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-----------------------
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Rationel:
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========
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Keeping libmad as a separate library on the system, either dynamic or statically linked in, makes maintenance so much simpeler.
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Merging with a new libmad version should be straight forward as long as the interface stays stable.
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There is another benefit: Disk (actually flash ROM) resources and memory are very limited on a iPaq.
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Other programs or utilities like madplay and BBplay can make use of the same libmad version we do. In this way
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limiting the needed storage place on disk (flash ROM). Also this is only possible when the interface stays the same.
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