Re: [Openquicktime-devel] New OpenQuicktime code layout

[Nicholas H. <nj...@ec...>]

Hi Antoine,

Thanks for the fixes - I'm not sure what I was doing with that dlerror thing ?!
And it does seem that Linux doesn't like the configure files I 
generate in Darwin - I had to do ./bootstrap on my Linux box as 
well....


I was in the middle of making changes to the Mp3 codec so that there 
doesn't need to be two copies of all the code - the codec will 
register both of its codes and hopefully a symbolic link will be 
enough for the loader to find it....

This is also supposed to be a generic solution so that plug-ins can 
support multiple codecs - Xanim and such...

Unless you think it is a bad idea - I am going to have a couple of 
the simple (single source file) codecs loaded internally. It seems 
stupid to have separate when they are so small - but they will be 
loaded into the codec table in the same way as external codecs... the 
internal versions won't be used unless it can't find an external 
version...

I have finished stripping out/cleaning up the codec support - so the 
callbacks are no longer stored multiple times in multiple locations - 
I will try to get it in CVS tonight...


I have also added additional information about the codecs - Name, 
version, author, API version etc... and added functions to the 
OpenQuicktime API so that you can list the available codecs...


I am just about to change the plug-in locating system (again!) so 
that only looks in the installation directory and directories listed 
in a environment variable (OQT_PLUGIN_DIR ?). This will make 
loading/listing of all codecs possible - but hopefully won't make it 
any less flexible - I'm not sure how/if this will effect the Windows 
version... Yann?


Thanks,


nick.


>Hi,
>I've downloaded the latest CVS code, but had to make some minor
>modifications in order to get it compile back on Unix/Linux platforms:
>
>  - audio/mp3 Makefile => generats _two_ codecs, .mp3 and _ms (there was
>a bug in the first release of Makefile.am of the new layout, and then
>one codec was disabled, I put back the way it was before, but with the bug
>corrected)
>
>  - player and encoder now have their own Makefile.am, they are built and
>installed automatically by the toplevel Makefile (but oqtplayer is built
>only if the configure script can find sdl-config)
>
>  - there was some dlerror mistake in plugin.c (should only be used if
>dlopen/dlsym/dlclose return NULL, it seems invalid to try dlerror()!=NULL
>to check for an error)
>
>It's now working fine on my computer and I have put these modifications
>back in the CVS... However, I may have broken some things (and I had to
>./bootstrap the code, maybee using older version of
>libttol/automake/autoconf)!
>
>
>>I have been working on the Uncompressed and IMA4 codecs.
>>
>>Should I be trying to implement them as internal codecs ?
>>- or was the plan to make all Codecs external - in which case there
>>seems to be a lot of dead code there... ?
>
>The idea was to have one minimal Quicktime library, and many little
>external codecs, one for each format/fourcc.
>QT4Linux did not have plug-in support, so all was implemented in the core
>library as internal codecs and we have this as a legacy => get rid of this
>code if you can!
>
>
>I also have the 3ivx Delta 3.5 codec modified so that it works with this
>new version (and slightly modified plug-in interface)...
>
>-
>Antoine


-- 
Nicholas Humfrey

Undergraduate, BSc Computer Science
University of Southampton, UK
nj...@ec...
http://www.ecs.soton.ac.uk/~njh399/