On 2019-12-07 22:31, Pali Rohár wrote:
On Saturday 07 December 2019 22:13:28 Andrey Semashev wrote:
On 2019-12-07 21:30, Pali Rohár wrote:
FDK-AAC library is incompatible with any version of the GNU GPL license
and therefore it is not possible to use it in any GPL licensed software,
like pulseaudio. See: https://www.gnu.org/licenses/license-list.html#fdk
Well, incompatibility means the resulting binary is not redistributable.
Users could still build PA with libfdk-aac locally.
Yes, you are right.
Or the library could be
loaded dynamically, if present on the user's system, without having to link
with it at build time.
Some people says that this is not legal too. Loading library either at
build (link) time is same as at runtime... And FSF has similar
explanation. Main problem is that license of external library does not
allow you to use it in your application. And it does not depend on how
you build your application or how you use that library (dlopen or
stating or dynamic linking). You are still usage same library API. But
I'm not lawyer...
Important it that if there are people who doubt about regular usage then
such functionality would not be included into distribution. And above
dynamic loading via dlopen is a reason for doubt that something is not
there fully legal and can be problematic.
If there is other AAC library which license allows usage it in
pulseaudio then it could be possible. Just somebody needs to write it.
The built-in implementation in ffmpeg is under LGPL 2.1, which should be
compatible.
Yes, LGPL 2.1 is fine.
One other question regarding libfdk-aac. Would it be ok to try using it
through ffmpeg if it is built with it? If ffmpeg is compiled without
libfdk-aac then we would fall back to the built-in encoder.
This would allow people who build ffmpeg themselves to use libfdk-aac.
On the PA side, this would require very little change code-wise (it
would not introduce build dependency on libfdk-aac), most of the
integration with ffmpeg remains the same.
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