Hi everybody,
I'm currently planning the work to do during the final period of GSoC. Among
other things
<https://www.mixxx.org/wiki/doku.php/multi-broadcasting#phase_3final_period1>,
I'd like to work on adding AAC and AAC+ encoding to Mixxx, along with Opus
encoding support. Streaming with these codecs has already been requested by
users on the bugtracker, and have been confirmed on the wishlist.
Integrating libopus as an encoder into Mixxx won't be much of a problem.
Care must be taken to mux the Opus datastream into an Ogg container stream
(that's how Opus streaming to Icecast is done).
However, AAC and AAC+ streaming is a bit more complex matter because of
well-know patents and licensing issues.
Here are two possible solutions to implement at least AAC streaming:
- Use libavcodec's built-in AAC encoder (libavcodec already being a
dependency), which is covered by LGPLv2.1 (see the source code
<https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/aacenc.c>).
Only AAC encoding would be supported, however.
- Or: dynamically load fdk-aac from the system or Mixxx's installation
folder. Both AAC and AAC+ encoding is possible with this solution. The wiki
page linked above has more details on where to find binary builds of
fdk-aac.
What do you think of these approaches?
Kind regards,
Stéphane Lepin (a.k.a Palakis)
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