So, how hard could it be to build my own music player backend? Seems like it would be a matter of solving these things:
- Use a robust library for audio decoding. How about the same one that VLC uses?
- Support adding and removing entries on a playlist for gapless playback.
- Support pause, play, and seek.
- Per-playlist-item gain adjustment so that perfect loudness compensation can be implemented.
- Support loudness scanning to make it easy to implement for example ReplayGain.
- Support playback to a sound device chosen at runtime.
- Support transcoding audio into another format so a player can implement, for example, HTTP streaming.
- Give raw access to decoded audio buffers just in case a player wants to do something other than one of the built-in things.
- Try to get other projects to use it to benefit from code reuse.
- Make the API generic enough to support other music players and other use cases.
- Get it packaged into Debian and Ubuntu.
- Make a blog post about it to increase awareness.
Playing music on a computer is almost as hard as reading text files. At this point, I'd be pretty happy with a player that:
- plays all tracks in a folder (since no one can get artist / album / compilation right)
- displays things in a list view (album art sucks if you download lots of independant or unpublished music)
- syncs locally on my devices - Mac, Windows, and iOS. Dropbox would be a great option here.
- plays your music through a browser
The loudness compensation and gain equalizing is not a big deal to me - I prefer to listen to DJ mixes and entire albums, so the next track is rarely going to be mixed differently than the previous, and it's too easy to introduce playback bugs there.
iTunes fails at all of these - syncing with iTunes Match blows, you have to make playlists for every folder, and it loooooves album art (even when most of it is missing). Also, it crashes constantly on windows.
Google Play Music (wtf branding) fails at 1 and 2, and I didn't get far enough to experiment with 3. Seems good enough at 4.
Spotify has terrible local vs cloud syncing, and pretty bad playlist management. Basically, if you're not getting all your music from their landfill of pop hits, get lost.
Amazon Music looks like it hits 2, 3 and 4. I have enough playlists at this point that maybe 1 won't be a problem.