Music player core Python module
This Python module provides a high-level core Music player interface where you are supposed to provide all the remaining high-level logic like the user interface, the playlist logic and the audio data.
A very simple player with gapless playback:
import musicplayer, sys, os, fnmatch, random, pprint, Tkinter class Song: def __init__(self, fn): self.url = fn self.f = open(fn) # `__eq__` is used for the peek stream management def __eq__(self, other): return self.url == other.url # this is used by the player as the data interface def readPacket(self, bufSize): return self.f.read(bufSize) def seekRaw(self, offset, whence): r = self.f.seek(offset, whence) return self.f.tell() files =  def getFiles(path): for f in sorted(os.listdir(path), key=lambda k: random.random()): f = os.path.join(path, f) if os.path.isdir(f): getFiles(f) # recurse if len(files) > 1000: break # break if we have enough if fnmatch.fnmatch(f, '*.mp3'): files.append(f) getFiles(os.path.expanduser("~/Music")) random.shuffle(files) # shuffle some more i = 0 def songs(): global i, files while True: yield Song(files[i]) i += 1 if i >= len(files): i = 0 def peekSongs(n): nexti = i + 1 if nexti >= len(files): nexti = 0 return map(Song, (files[nexti:] + files[:nexti])[:n]) # Create our Music Player. player = musicplayer.createPlayer() player.outSamplerate = 96000 # support high quality :) player.queue = songs() player.peekQueue = peekSongs # Setup a simple GUI. window = Tkinter.Tk() window.title("Music Player") songLabel = Tkinter.StringVar() def onSongChange(**kwargs): songLabel.set(pprint.pformat(player.curSongMetadata)) def cmdPlayPause(*args): player.playing = not player.playing def cmdNext(*args): player.nextSong() Tkinter.Label(window, textvariable=songLabel).pack() Tkinter.Button(window, text="Play/Pause", command=cmdPlayPause).pack() Tkinter.Button(window, text="Next", command=cmdNext).pack() player.onSongChange = onSongChange player.playing = True # start playing window.mainloop()
It provides a player object which represents the player. It needs a generator player.queue which yields Song objects which provide a way to read file data and seek in the file. See the source code for further detailed reference.
It has the following functionality:
- open source (simplified BSD license, see License.txt)
- very simple interface
- support of most important sound formats (MP3, Flac, Ogg Vorbis, WMA, AAC / ALAC m4a, …)
- Plays audio data via the player object. Uses FFmpeg for decoding and PortAudio for playing.
- Of course, the decoding and playback is done in seperate threads. You can read about that here.
- Supports any sample rate via player.outSamplerate. The preferred sound device is set via player.preferredSoundDevice. Get a list of all sound devices via getSoundDevices().
- Can modify the volume via player.volume and also song.gain (see source code for details).
- Prevents clipping via a smooth limiting functions which still leaves most sounds unaffected and keeps the dynamic range (see smoothClip).
- ReplayGain (for audio volume normalization) (see pyCalcReplayGain). This is as far as I know the only other implementation of ReplayGain despite the original from mp3gain (gain_analysis.c).
- AcoustId audio fingerprint (see pyCalcAcoustIdFingerprint). This one is also used by MusicBrainz. It uses the Chromaprint lib for implementation.
- Provides a simple way to access the song metadata.
- Provides a way to calculate a visual thumbnail for a song which shows the amplitude and the spectral centroid of the frequencies per time (see pyCalcBitmapThumbnail). Inspired by this project.
- Gapless playback
The main usage is probably in the MusicPlayer project - a full featured high-quality music player.
To get the source working, you need these requirements:
- boost >=1.55.0
- ffmpeg >= 2.0 (including libswresample)
- portaudio >=v19
apt-get install python-dev libsnappy-dev libtool yasm libchromaprint-dev portaudio19-dev libboost-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.
brew install boost brew install portaudio brew install ffmpeg brew install chromaprint
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 python setup.py build or ./compile.py to build the Python modules (it will build the Python module musicplayer.so).
The module is also registered on PyPI, so you can also install via:
- Overview in Python Wiki: Audio modules and Music software.
- PyAudio. MIT License. PortAudio wrapper. Thus, pretty low-level and no decoding functionality. Last update from 2012.
- PyFFmpeg. LGPL. FFmpeg wrapper. Thus, prettylow-level and no sound output. You could probably glue PyFFmpeg and PyAudio together for something useful but I expect it to be quite unstable and too slow. Basically, tis glue is done in C++ in this module.
- GStreamer Python Bindings. GStreamer is powerful but still too limited as a cross-platform music player backend solution. Quite heavy. That was my intuition. Maybe it’s wrong and it would have been a perfect solution. But I think, in contrast, this module does a lot of things in a more compact and automatic/simpler way and at the same time provides more music player centric features.
- Beets. In its core, it is a music library manager and manages the metadata. It can calculate ReplayGain and AcoustID fingerprint. Via BPD plugin, it becomes a MPD compatible daemon player, based on GStreamer.
Probably dead projects:
- PyMedia. LGPL, GPL. FFmpeg-based encoding/decoding of audio+video, sound input/output via OSS/Waveout/Wavein. Unfornutaley not well tuned for usage in a high-quality music player. Last update from 2006.
- Audiere. LGPL. High-level audio API, supports many sound formats and sound output on Windows/Linux. Last update from 2006.
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