[FFmpeg-devel] [PATCH] lavu/libm: add erf hack

Ganesh Ajjanagadde gajjanag at mit.edu
Sun Dec 20 07:30:53 CET 2015


On Sat, Dec 19, 2015 at 7:06 PM, James Almer <jamrial at gmail.com> wrote:
> On 12/19/2015 11:34 PM, Ganesh Ajjanagadde wrote:
>> +/**
>> + * erf function
>> + * Algorithm taken from the Boost project, source:
>> + * http://www.boost.org/doc/libs/1_46_1/boost/math/special_functions/erf.hpp
>> + * Use, modification and distribution are subject to the
>> + * Boost Software License, Version 1.0 (see notice below).
>> + * Boost Software License - Version 1.0 - August 17th, 2003
>> +Permission is hereby granted, free of charge, to any person or organization
>> +obtaining a copy of the software and accompanying documentation covered by
>> +this license (the "Software") to use, reproduce, display, distribute,
>> +execute, and transmit the Software, and to prepare derivative works of the
>> +Software, and to permit third-parties to whom the Software is furnished to
>> +do so, all subject to the following:
>> +
>> +The copyright notices in the Software and this entire statement, including
>> +the above license grant, this restriction and the following disclaimer,
>> +must be included in all copies of the Software, in whole or in part, and
>> +all derivative works of the Software, unless such copies or derivative
>> +works are solely in the form of machine-executable object code generated by
>> +a source language processor.
>> +
>> +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>> +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>> +FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
>> +SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
>> +FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
>> +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
>> +DEALINGS IN THE SOFTWARE.
>> + */
>
> Unrelated to the actual patch, but how about instead doing what the FAQ section
> of http://www.boost.org/users/license.html mentions and adding the Boost license
> in a separate file?
> That way, only the short four line snippet mentioned there would be needed here
> and in swr/resample.c

I had numerous back and forths with Carl regarding licensing. The
short summary is: I am not a lawyer, and I like to play it safe. Thus,
I think it belongs to a separate patch, and I would not do it myself
as I don't have the needed expertise.

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