requirements for media-api

Hi folks,

after long discussions, I'd like to list requirements for the 
media-api, we've worked out for now:


* general framework
    -> module management (load-on-call, dynamic or static linking)
    -> different types of modules (codecs, io, ...)
    -> generic build system for modules (also those not in the main distro)

* codec modules
    => query interface:
       each module supports can supply a bunch of codecs, which each converts 
       from one fixed presentation to another (i.e. mp3 -> pcm16-44khz)
          
    => capability interfaces:
	-> can I work on files ? can I use mmap ? how useful is it ?
	-> can I do keyframe-seeking ? can I do per-sample-seeking ? 
	   what is required on input side ? 
	-> how long in timestamps are samples/frames ? (time-resolution)
	-> are timestamps natively supported (or emulated) ?
	-> what buffer capabilities do we have ?
	-> what latency (in frames or time) does the conversion have ?
	-> what is the min and max keyframe distance (i.e. in timestamps) ?
	-> how much CPU time does the conversion approx need ?
	-> which input modes do we support (push, fetch) ?
	-> which output modes do we support (push, fetch) ? 
	-> do we support or require MT ?
	
    => detection interfaces
	-> several rules to detect whether the input is in req. format
	-> also support for native idents (i.e. in AVI) or use textual names
	   provided by the multiplexer ?

    => instance interfaces
	-> create a new converter
	-> connect converter to an input or output
	-> process # of frames or spec. time
	-> seek
	-> read out decoded frames
	-> push in encoded frames

... to be continued ...



cu
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