[FFmpeg-devel] [PATCH] Enable swscale by default

Justin Ruggles justin.ruggles
Sun Sep 14 17:00:52 CEST 2008

Michael Niedermayer wrote:
> On Sun, Sep 14, 2008 at 03:14:08PM +0100, M?ns Rullg?rd wrote:
>> Michael Niedermayer <michaelni at gmx.at> writes:
>>> On Sun, Sep 14, 2008 at 02:12:00PM +0100, M?ns Rullg?rd wrote:
>>>> Diego Biurrun <diego at biurrun.de> writes:
>>>>> On Sat, Sep 13, 2008 at 03:27:44PM -0700, Baptiste Coudurier wrote:
>>>>>> Michael Niedermayer wrote:
>>>>>>> I thought it was agreed in the droping of the old scaler thread
>>>>>>> that whoever wants a lgpl scaler will have to do the work.
>>>>>> I didn't agree _at all_ with that, and I will vote against.
>>>>> While I surely do not want to fan the flames, this has been a long time
>>>>> coming - I think it's time for the LGPL faction to stand up and work...
>>>> Until last night, I was under the impression that the switch to
>>>> swscale would only be done when the mmx parts were separated from the
>>>> main code, and an lgpl version could be built.  It would appear that I
>>>> was mistaken, if not misled.  Making the scaler and colourspace
>>>> converter gpl is effectively making all of ffmpeg gpl.
>>> I must admit i was myself not fully aware of a few consequences of droping
>>> the old scaler, like ./configure failing. Though i thought it was obvious
>>> that droping the old scaler would implicate one way or another no lgpl
>>> scaler until walkens yuv2rgb code was rewritten.
>> Why has it been repeatedly stated in the past, that the GPL-only parts
>> were only needed for mmx, and that a plain-C LGPL swscale is easily
>> possible, if this is not true?  If I were prone to conspiracy theories
>> (and I sometimes am), I might suspect this was an underhanded attempt
>> to make FFmpeg GPL without anyone noticing before it was too late.
>> I'm in a good mood today, so I won't make such accusations just yet.
> The only plain C GPL code that iam aware of that we need in there are
> 220 lines of yuv2rgb table generation code.
> Rewriting this is easy, luca did it already IIRC but walken
> claimed copyright on the rewritten table generator. Noone else dared to
> try again and i simply have no personal interrest in rewriting FOSS code
> due to its license being disliked by some other people.

Can someone post the output of these tables somewhere (maybe
ftp/incoming if they're really big)?  I have not seen the table
generation code, and to output the tables, I assume one would have to
locate this code and look at it to know where to add printf's.


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