Music player

First, if you wonder about what is supposed to be a music player or what makes a music player different from a simple media player, read this: What is a music player

Annoyed by all existing players because some subset of:

not open source
missing sound format (FLAC, Ogg, ...)
bugs (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ...)
missing output possibility (RAOP, PulseAudio, ...)
none or too limited intelligent automatic queue (iTunes calls this DJ mode, others call this PartyShuffle)
no library / database

Features of this player:

open source (simplified BSD license, see License.txt)
simple
support of most important sound formats
advanced intelligent automatic queue which is the main mode to play music
simple music database
ReplayGain / audio volume normalization
Last.fm scrobbling
AcoustID fingerprint

About the intelligent automatic queue, what I want (maybe some of these somewhat configurable):

continuously always add songs when queue becomes too empty
liked songs more often
context-based choices, e.g. related songs more likely
possibility to easily manually add songs to the list
easy way to restrict to a subset of songs (like a genre, a playlist, a filesystem directory, etc.)

About the database:

main function: search
should be fast and optional for playback, i.e. music can be played even when the database is currently not ready for some reason
should automatically be filled by a filesystem directory
import like-state from local players like iTunes and also online services like Last.fm

TODO / possible additional missing features:

Gapless playback. I think ffmpeg provides some way to get the exact specified start/end of a song. Otherwise this is just a question of buffering.
BPM determination and clever DJ-like fading
echoprint.me or similar song determination (mostly for metadata, esp. if missing)
use tags given by Last.fm (mostly more tags)
Last.fm streaming support
watch music directory for changes (e.g. new files added)

Installation:

So far, there is a prebuild MacOSX app bundle in the download section which should just work. Otherwise, to get the source working, you need these requirements (e.g. install on MacOSX via Homebrew):

ffmpeg
portaudio
chromaprint

(Debian/Ubuntu: apt-get install python-dev libsnappy-dev libtool yasm libchromaprint-dev portaudio19-dev. FFmpeg in Debian/Ubuntu is too old (lacks libswresample), so either do add-apt-repository ppa:jon-severinsson/ffmpeg && apt-get update && apt-get install libavformat-dev libswresample-dev or install it from source. Chromaprint depends on FFmpeg, so if you have a custom FFmpeg install, you might also want to install that manually. ./configure && make && sudo make install should work for FFmpeg and PortAudio. You might also want to use --enable-shared for FFmpeg. cmake . && sudo make install for Chromaprint.)

Then call ./compile.py to build the Python modules (it will build the Python modules ffmpeg.so and leveldb.so).

To start the player, just call ./main.py.

The current GUI is Cocoa only. Additional Qt support is planned. The music player also works without any GUI.

Authors:

Albert Zeyer, http://www.az2000.de: founder of the project, main core, ffmpeg module, etc.
Bryan Joseph, http://bryaninspired.com: some initial ideas about the database