Pure-Go AAC Decoder

[nlowe]

Unless we can figure out #8 , we should probably write a native AAC Decoder so we can drop gstreamer and use github.com/faiface/beep.

[nlowe]

Note, there's already an open issue for this: faiface/beep#55, might be worth upstreaming if we get this working.

[nlowe]

After fixing #1 it looks like either gstreamer.freedesktop.org is stupid slow or is throttling us. Windows builds commonly spend 15-20 minutes just installing gstreamer. It'd be really awesome if we could figure this or #8 out.

[skuzzymiglet]

As far as I can see, it's https://github.com/gen2brain/aac-go, but that's a cgo binding

[nlowe]

Well, I appear to have fubar'd my gstreamer/pkg-config install on windows. I do have a solution that shells out to FFmpeg to transcode to PCM and then use https://github.com/faiface/beep to play the tracks. However, https://github.com/faiface/beep requires valid chunk lengths to be defined in the RIFF and fmt chunks. If FFmpeg streams output to a pipe, it can't detect the track length ahead of time and sets the chunk lengths to 0xffffffff which beep's WAV decoder does not like. The best workaround I have so far is to transcode to a temporary file and then play that through beep.