/usr/share/decibel-audio-player/src/modules/Covers.py is in decibel-audio-player 1.04-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Author: Ingelrest François (Francois.Ingelrest@gmail.com)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import gui, Image, modules, os, socket, tempfile, tools, traceback, urllib2
from tools import consts, prefs
from gettext import gettext as _
from tools.log import logger
# Module information
MOD_INFO = ('Covers', _('Covers'), _('Show album covers'), [], False, True)
MOD_NAME = MOD_INFO[modules.MODINFO_NAME]
MOD_L10N = MOD_INFO[modules.MODINFO_L10N]
AS_API_KEY = 'fd8dd98d26bb3f288f3e626502f9add6' # Ingelrest François' Audioscrobbler API key
AS_TAG_START = '<image size="large">' # The text that is right before the URL to the cover
AS_TAG_END = '</image>' # The text that is right after the URL to the cover
# It seems that a non standard 'user-agent' header may cause problem, so let's cheat
USER_AGENT = 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008072820 Firefox/3.0.1'
# We store both the paths to the thumbnail and to the full size image
(
CVR_THUMB,
CVR_FULL
) = range(2)
# Constants for thumbnails
THUMBNAIL_WIDTH = 100 # Width allocated to thumbnails in the model
THUMBNAIL_HEIGHT = 100 # Height allocated to thumbnails in the model
THUMBNAIL_OFFSETX = 11 # X-offset to render the thumbnail in the model
THUMBNAIL_OFFSETY = 3 # Y-offset to render the thumbnail in the model
# Constants for full size covers
FULL_SIZE_COVER_WIDTH = 300
FULL_SIZE_COVER_HEIGHT = 300
# File formats we can read
ACCEPTED_FILE_FORMATS = {'.jpg': None, '.jpeg': None, '.png': None, '.gif': None}
# Default preferences
PREFS_DFT_DOWNLOAD_COVERS = False
PREFS_DFT_PREFER_USER_COVERS = True
PREFS_DFT_USER_COVER_FILENAMES = ['cover', 'art', 'front', '*']
# Images for thumbnails
THUMBNAIL_GLOSS = os.path.join(consts.dirPix, 'cover-gloss.png')
THUMBNAIL_MODEL = os.path.join(consts.dirPix, 'cover-model.png')
class Covers(modules.ThreadedModule):
def __init__(self):
""" Constructor """
modules.ThreadedModule.__init__(self, (consts.MSG_EVT_MOD_LOADED, consts.MSG_EVT_APP_STARTED, consts.MSG_EVT_NEW_TRACK,
consts.MSG_EVT_MOD_UNLOADED, consts.MSG_EVT_APP_QUIT))
def onModLoaded(self):
""" The module has been loaded """
self.cfgWin = None # Configuration window
self.coverMap = {} # Store covers previously requested
self.currTrack = None # The current track being played, if any
self.cacheRootPath = os.path.join(consts.dirCfg, MOD_NAME) # Local cache for Internet covers
self.coverBlacklist = {} # When a cover cannot be downloaded, avoid requesting it again
if not os.path.exists(self.cacheRootPath):
os.mkdir(self.cacheRootPath)
def onModUnloaded(self):
""" The module has been unloaded """
if self.currTrack is not None:
modules.postMsg(consts.MSG_CMD_SET_COVER, {'track': self.currTrack, 'pathThumbnail': None, 'pathFullSize': None})
# Delete covers that have been generated by this module
for covers in self.coverMap.itervalues():
if os.path.exists(covers[CVR_THUMB]):
os.remove(covers[CVR_THUMB])
if os.path.exists(covers[CVR_FULL]):
os.remove(covers[CVR_FULL])
self.coverMap = None
# Delete blacklist
self.coverBlacklist = None
def generateFullSizeCover(self, inFile, outFile, format):
""" Resize inFile if needed, and write it to outFile (outFile and inFile may be equal) """
try:
# Open the image
cover = Image.open(inFile)
# Resize in the best way we can
if cover.size[0] < FULL_SIZE_COVER_WIDTH: newWidth = cover.size[0]
else: newWidth = FULL_SIZE_COVER_WIDTH
if cover.size[1] < FULL_SIZE_COVER_HEIGHT: newHeight = cover.size[1]
else: newHeight = FULL_SIZE_COVER_HEIGHT
cover = cover.resize((newWidth, newHeight), Image.ANTIALIAS)
# We're done
cover.save(outFile, format)
except:
logger.error('[%s] An error occurred while generating a showable full size cover\n\n%s' % (MOD_NAME, traceback.format_exc()))
def generateThumbnail(self, inFile, outFile, format):
""" Generate a thumbnail from inFile (e.g., resize it) and write it to outFile (outFile and inFile may be equal) """
try:
# Open the image
cover = Image.open(inFile).convert('RGBA')
# Resize in the best way we can
if cover.size[0] < THUMBNAIL_WIDTH:
newWidth = cover.size[0]
offsetX = (THUMBNAIL_WIDTH - cover.size[0]) / 2
else:
newWidth = THUMBNAIL_WIDTH
offsetX = 0
if cover.size[1] < THUMBNAIL_HEIGHT:
newHeight = cover.size[1]
offsetY = (THUMBNAIL_HEIGHT - cover.size[1]) / 2
else:
newHeight = THUMBNAIL_HEIGHT
offsetY = 0
cover = cover.resize((newWidth, newHeight), Image.ANTIALIAS)
# Paste the resized cover into our model
model = Image.open(THUMBNAIL_MODEL).convert('RGBA')
model.paste(cover, (THUMBNAIL_OFFSETX + offsetX, THUMBNAIL_OFFSETY + offsetY), cover)
cover = model
# Don't apply the gloss effect if asked to
if not prefs.getCmdLine()[0].no_glossy_cover:
gloss = Image.open(THUMBNAIL_GLOSS).convert('RGBA')
cover.paste(gloss, (0, 0), gloss)
# We're done
cover.save(outFile, format)
except:
logger.error('[%s] An error occurred while generating a thumbnail\n\n%s' % (MOD_NAME, traceback.format_exc()))
def getUserCover(self, trackPath):
""" Return the path to a cover file in trackPath, None if no cover found """
# Create a dictionary with candidates
candidates = {}
for (file, path) in tools.listDir(trackPath, True):
(name, ext) = os.path.splitext(file.lower())
if ext in ACCEPTED_FILE_FORMATS:
candidates[name] = path
# Check each possible name using the its index in the list as its priority
for name in prefs.get(__name__, 'user-cover-filenames', PREFS_DFT_USER_COVER_FILENAMES):
if name in candidates:
return candidates[name]
if name == '*' and len(candidates) != 0:
return candidates.values()[0]
return None
def getFromCache(self, artist, album):
""" Return the path to the cached cover, or None if it's not cached """
cachePath = os.path.join(self.cacheRootPath, str(abs(hash(artist))))
cacheIdxPath = os.path.join(cachePath, 'INDEX')
try:
cacheIdx = tools.pickleLoad(cacheIdxPath)
cover = os.path.join(cachePath, cacheIdx[artist + album])
if os.path.exists(cover):
return cover
except:
pass
return None
def __getFromInternet(self, artist, album):
"""
Try to download the cover from the Internet
If successful, add it to the cache and return the path to it
Otherwise, return None
"""
# Make sure to not be blocked by the request
socket.setdefaulttimeout(consts.socketTimeout)
# Request information to Last.fm
# Beware of UTF-8 characters: we need to percent-encode all characters
try:
url = 'http://ws.audioscrobbler.com/2.0/?method=album.getinfo&api_key=%s&artist=%s&album=%s' % (AS_API_KEY,
tools.percentEncode(artist), tools.percentEncode(album))
request = urllib2.Request(url, headers = {'User-Agent': USER_AGENT})
stream = urllib2.urlopen(request)
data = stream.read()
except urllib2.HTTPError, err:
if err.code == 400:
logger.error('[%s] No known cover for %s / %s' % (MOD_NAME, artist, album))
else:
logger.error('[%s] Information request failed\n\n%s' % (MOD_NAME, traceback.format_exc()))
return None
except:
logger.error('[%s] Information request failed\n\n%s' % (MOD_NAME, traceback.format_exc()))
return None
# Extract the URL to the cover image
malformed = True
startIdx = data.find(AS_TAG_START)
endIdx = data.find(AS_TAG_END, startIdx)
if startIdx != -1 and endIdx != -1:
coverURL = data[startIdx+len(AS_TAG_START):endIdx]
coverFormat = os.path.splitext(coverURL)[1].lower()
if coverURL.startswith('http://') and coverFormat in ACCEPTED_FILE_FORMATS:
malformed = False
if malformed:
logger.error('[%s] Received malformed data\n\n%s' % (MOD_NAME, data))
return None
# Download the cover image
try:
request = urllib2.Request(coverURL, headers = {'User-Agent': USER_AGENT})
stream = urllib2.urlopen(request)
data = stream.read()
if len(data) < 1024:
raise Exception, 'The cover image seems incorrect (%u bytes is too small)' % len(data)
except:
logger.error('[%s] Cover image request failed\n\n%s' % (MOD_NAME, traceback.format_exc()))
return None
# So far, so good: let's cache the image
cachePath = os.path.join(self.cacheRootPath, str(abs(hash(artist))))
cacheIdxPath = os.path.join(cachePath, 'INDEX')
if not os.path.exists(cachePath):
os.mkdir(cachePath)
try: cacheIdx = tools.pickleLoad(cacheIdxPath)
except: cacheIdx = {}
nextInt = len(cacheIdx) + 1
filename = str(nextInt) + coverFormat
coverPath = os.path.join(cachePath, filename)
cacheIdx[artist + album] = filename
tools.pickleSave(cacheIdxPath, cacheIdx)
try:
output = open(coverPath, 'wb')
output.write(data)
output.close()
return coverPath
except:
logger.error('[%s] Could not save the downloaded cover\n\n%s' % (MOD_NAME, traceback.format_exc()))
return None
def getFromInternet(self, artist, album):
""" Wrapper for __getFromInternet(), manage blacklist """
coverKey = artist + album
# If we already tried without success, don't try again
if coverKey in self.coverBlacklist:
return None
# Otherwise, try to download the cover
cover = self.__getFromInternet(artist, album)
# If the download failed, blacklist the album
if cover is None:
self.coverBlacklist[coverKey] = None
return cover
def onNewTrack(self, track):
""" A new track is being played, try to retrieve the corresponding cover """
# Make sure we have enough information
if track.getArtist() == consts.UNKNOWN_ARTIST or track.getAlbum() == consts.UNKNOWN_ALBUM:
modules.postMsg(consts.MSG_CMD_SET_COVER, {'track': track, 'pathThumbnail': None, 'pathFullSize': None})
return
album = track.getAlbum().lower()
artist = track.getArtist().lower()
coverKey = artist + album
rawCover = None
self.currTrack = track
# Let's see whether we already have the cover
if coverKey in self.coverMap:
covers = self.coverMap[coverKey]
pathFullSize = covers[CVR_FULL]
pathThumbnail = covers[CVR_THUMB]
# Make sure the files are still there
if os.path.exists(pathThumbnail) and os.path.exists(pathFullSize):
modules.postMsg(consts.MSG_CMD_SET_COVER, {'track': track, 'pathThumbnail': pathThumbnail, 'pathFullSize': pathFullSize})
return
# Should we check for a user cover?
if not prefs.get(__name__, 'download-covers', PREFS_DFT_DOWNLOAD_COVERS) \
or prefs.get(__name__, 'prefer-user-covers', PREFS_DFT_PREFER_USER_COVERS):
rawCover = self.getUserCover(os.path.dirname(track.getFilePath()))
# Is it in our cache?
if rawCover is None:
rawCover = self.getFromCache(artist, album)
# If we still don't have a cover, maybe we can try to download it
if rawCover is None:
modules.postMsg(consts.MSG_CMD_SET_COVER, {'track': track, 'pathThumbnail': None, 'pathFullSize': None})
if prefs.get(__name__, 'download-covers', PREFS_DFT_DOWNLOAD_COVERS):
rawCover = self.getFromInternet(artist, album)
# If we still don't have a cover, too bad
# Otherwise, generate a thumbnail and a full size cover, and add it to our cover map
if rawCover is not None:
thumbnail = tempfile.mktemp() + '.png'
fullSizeCover = tempfile.mktemp() + '.png'
self.generateThumbnail(rawCover, thumbnail, 'PNG')
self.generateFullSizeCover(rawCover, fullSizeCover, 'PNG')
if os.path.exists(thumbnail) and os.path.exists(fullSizeCover):
self.coverMap[coverKey] = (thumbnail, fullSizeCover)
modules.postMsg(consts.MSG_CMD_SET_COVER, {'track': track, 'pathThumbnail': thumbnail, 'pathFullSize': fullSizeCover})
else:
modules.postMsg(consts.MSG_CMD_SET_COVER, {'track': track, 'pathThumbnail': None, 'pathFullSize': None})
# --== Message handler ==--
def handleMsg(self, msg, params):
""" Handle messages sent to this module """
if msg == consts.MSG_EVT_NEW_TRACK:
self.onNewTrack(params['track'])
elif msg in (consts.MSG_EVT_MOD_LOADED, consts.MSG_EVT_APP_STARTED):
self.onModLoaded()
elif msg in (consts.MSG_EVT_MOD_UNLOADED, consts.MSG_EVT_APP_QUIT):
self.onModUnloaded()
# --== Configuration ==--
def configure(self, parent):
""" Show the configuration window """
if self.cfgWin is None:
self.cfgWin = gui.window.Window('Covers.glade', 'vbox1', __name__, MOD_L10N, 320, 265)
self.cfgWin.getWidget('btn-ok').connect('clicked', self.onBtnOk)
self.cfgWin.getWidget('img-lastfm').set_from_file(os.path.join(consts.dirPix, 'audioscrobbler.png'))
self.cfgWin.getWidget('btn-help').connect('clicked', self.onBtnHelp)
self.cfgWin.getWidget('chk-downloadCovers').connect('toggled', self.onDownloadCoversToggled)
self.cfgWin.getWidget('btn-cancel').connect('clicked', lambda btn: self.cfgWin.hide())
if not self.cfgWin.isVisible():
downloadCovers = prefs.get(__name__, 'download-covers', PREFS_DFT_DOWNLOAD_COVERS)
preferUserCovers = prefs.get(__name__, 'prefer-user-covers', PREFS_DFT_PREFER_USER_COVERS)
userCoverFilenames = prefs.get(__name__, 'user-cover-filenames', PREFS_DFT_USER_COVER_FILENAMES)
self.cfgWin.getWidget('btn-ok').grab_focus()
self.cfgWin.getWidget('txt-filenames').set_text(', '.join(userCoverFilenames))
self.cfgWin.getWidget('chk-downloadCovers').set_active(downloadCovers)
self.cfgWin.getWidget('chk-preferUserCovers').set_active(preferUserCovers)
self.cfgWin.getWidget('chk-preferUserCovers').set_sensitive(downloadCovers)
self.cfgWin.show()
def onBtnOk(self, btn):
""" Save configuration """
downloadCovers = self.cfgWin.getWidget('chk-downloadCovers').get_active()
preferUserCovers = self.cfgWin.getWidget('chk-preferUserCovers').get_active()
userCoverFilenames = [word.strip() for word in self.cfgWin.getWidget('txt-filenames').get_text().split(',')]
prefs.set(__name__, 'download-covers', downloadCovers)
prefs.set(__name__, 'prefer-user-covers', preferUserCovers)
prefs.set(__name__, 'user-cover-filenames', userCoverFilenames)
self.cfgWin.hide()
def onDownloadCoversToggled(self, downloadCovers):
""" Toggle the "prefer user covers" checkbox according to the state of the "download covers" one """
self.cfgWin.getWidget('chk-preferUserCovers').set_sensitive(downloadCovers.get_active())
def onBtnHelp(self, btn):
""" Display a small help message box """
helpDlg = gui.help.HelpDlg(MOD_L10N)
helpDlg.addSection(_('Description'),
_('This module displays the cover of the album the current track comes from. Covers '
'may be loaded from local pictures, located in the same directory as the current '
'track, or may be downloaded from the Internet.'))
helpDlg.addSection(_('User Covers'),
_('A user cover is a picture located in the same directory as the current track. '
'When specifying filenames, you do not need to provide file extensions, supported '
'file formats (%s) are automatically used.' % ', '.join(ACCEPTED_FILE_FORMATS.iterkeys())))
helpDlg.addSection(_('Internet Covers'),
_('Covers may be downloaded from the Internet, based on the tags of the current track. '
'You can ask to always prefer user covers to Internet ones. In this case, if a user '
'cover exists for the current track, it is used. If there is none, the cover is downloaded.'))
helpDlg.show(self.cfgWin)
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