[Ffmpeg-devel] Porting to TI DM642 DSP
Mon Apr 18 11:17:42 CEST 2005
Vincent Derrien wrote:
Please dont top-post.
> I was very interesting by your project. Can you give me aware about this
> please ?
> Thanks in advance.
> Patrick Noffke a ?crit :
>> I'd like to use the ffmpeg libraries on a TI DM642 DSP. Can anyone
>> comment on the feasibility of doing this, and perhaps provide an
>> overview of the hurdles I need to overcome? Initially, I see two
>> major challenges:
>> 1) Compiling -- I imagine #include statements will need to be
>> modified to work with TI's tools. I would like to avoid major
>> modifications to the source with #ifdef statements (and I believe this
>> is the philosophy of ffmpeg developers). Additionally, some types may
>> not be supported with TI's compiler.
>> 2) Optimization -- Initially, I just want to build without
>> optimization. Then (assuming performance is less than great), I
>> intend to optimize certain primitives (e.g. DC T), preferrably by
>> using TI's versions of these primitives.
>> Can anyone comment on the above two challenges (or others), and
>> recommend ways to overcome them? Perhaps someone that ported to
>> another platform would be able to make some recommendations?
There is a 3rd hurdle: the LGPL forbids distribution of ffmpeg, modified
or not, in such a way that the user is not able to replace ffmpeg by a
newer version. That means you have to publish your patches, *and* source
or link-able binaries for your application, *and* instructions on how to
re-link (and with a DSP, probably flash an PROM) using some free
I realize this puts heavy constraints on using ffmpeg for embedded
systems, thereby actually inciting people to use proprietary rather than
open-source software on embedded systems. But currently, for ffmpeg,
LGPL is the only game in town...
>> Thanks in advance for your help.
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Tel : +32 2 790.29.41
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