229 lines
7.5 KiB
Python
229 lines
7.5 KiB
Python
# -*- coding: utf-8 -*-
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from contextlib import contextmanager
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from media.monitor.pure import truncate_to_length, toposort
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from os.path import normpath
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from media.monitor.exceptions import BadSongFile
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from media.monitor.log import Loggable
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import media.monitor.pure as mmp
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from collections import namedtuple
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import mutagen
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import subprocess
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import json
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class FakeMutagen(dict):
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"""
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Need this fake mutagen object so that airtime_special functions
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return a proper default value instead of throwing an exceptions for
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files that mutagen doesn't recognize
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"""
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FakeInfo = namedtuple('FakeInfo','length bitrate')
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def __init__(self,path):
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self.path = path
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self.mime = ['audio/wav']
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self.info = FakeMutagen.FakeInfo(0.0, '')
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dict.__init__(self)
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def set_length(self,l):
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old_bitrate = self.info.bitrate
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self.info = FakeMutagen.FakeInfo(l, old_bitrate)
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class MetadataAbsent(Exception):
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def __init__(self, name): self.name = name
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def __str__(self): return "Could not obtain element '%s'" % self.name
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class MetadataElement(Loggable):
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def __init__(self,name):
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self.name = name
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# "Sane" defaults
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self.__deps = set()
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self.__normalizer = lambda x: x
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self.__optional = True
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self.__default = None
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self.__is_normalized = lambda _ : True
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self.__max_length = -1
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self.__translator = None
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def max_length(self,l):
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self.__max_length = l
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def optional(self, setting):
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self.__optional = setting
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def is_optional(self):
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return self.__optional
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def depends(self, *deps):
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self.__deps = set(deps)
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def dependencies(self):
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return self.__deps
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def translate(self, f):
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self.__translator = f
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def is_normalized(self, f):
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self.__is_normalized = f
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def normalize(self, f):
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self.__normalizer = f
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def default(self,v):
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self.__default = v
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def get_default(self):
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if hasattr(self.__default, '__call__'): return self.__default()
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else: return self.__default
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def has_default(self):
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return self.__default is not None
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def path(self):
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return self.__path
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def __slice_deps(self, d):
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"""
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returns a dictionary of all the key value pairs in d that are also
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present in self.__deps
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"""
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return dict( (k,v) for k,v in d.iteritems() if k in self.__deps)
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def __str__(self):
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return "%s(%s)" % (self.name, ' '.join(list(self.__deps)))
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def read_value(self, path, original, running={}):
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# If value is present and normalized then we only check if it's
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# normalized or not. We normalize if it's not normalized already
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if self.name in original:
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v = original[self.name]
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if self.__is_normalized(v): return v
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else: return self.__normalizer(v)
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# We slice out only the dependencies that are required for the metadata
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# element.
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dep_slice_orig = self.__slice_deps(original)
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dep_slice_running = self.__slice_deps(running)
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# TODO : remove this later
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dep_slice_special = self.__slice_deps({'path' : path})
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# We combine all required dependencies into a single dictionary
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# that we will pass to the translator
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full_deps = dict( dep_slice_orig.items()
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+ dep_slice_running.items()
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+ dep_slice_special.items())
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# check if any dependencies are absent
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# note: there is no point checking the case that len(full_deps) >
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# len(self.__deps) because we make sure to "slice out" any supefluous
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# dependencies above.
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if len(full_deps) != len(self.dependencies()) or \
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len(self.dependencies()) == 0:
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# If we have a default value then use that. Otherwise throw an
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# exception
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if self.has_default(): return self.get_default()
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else: raise MetadataAbsent(self.name)
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# We have all dependencies. Now for actual for parsing
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def def_translate(dep):
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def wrap(k):
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e = [ x for x in dep ][0]
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return k[e]
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return wrap
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# Only case where we can select a default translator
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if self.__translator is None:
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self.translate(def_translate(self.dependencies()))
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if len(self.dependencies()) > 2: # dependencies include themselves
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self.logger.info("Ignoring some dependencies in translate %s"
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% self.name)
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self.logger.info(self.dependencies())
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r = self.__normalizer( self.__translator(full_deps) )
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if self.__max_length != -1:
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r = truncate_to_length(r, self.__max_length)
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return r
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def normalize_mutagen(path):
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"""
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Consumes a path and reads the metadata using mutagen. normalizes some of
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the metadata that isn't read through the mutagen hash
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"""
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if not mmp.file_playable(path): raise BadSongFile(path)
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try : m = mutagen.File(path, easy=True)
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except Exception : raise BadSongFile(path)
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if m is None: m = FakeMutagen(path)
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try:
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if mmp.extension(path) == 'wav':
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m.set_length(mmp.read_wave_duration(path))
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except Exception: raise BadSongFile(path)
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md = {}
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for k,v in m.iteritems():
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if type(v) is list:
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if len(v) > 0: md[k] = v[0]
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else: md[k] = v
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# populate special metadata values
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md['length'] = getattr(m.info, 'length', 0.0)
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md['bitrate'] = getattr(m.info, 'bitrate', u'')
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md['sample_rate'] = getattr(m.info, 'sample_rate', 0)
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md['mime'] = m.mime[0] if len(m.mime) > 0 else u''
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md['path'] = normpath(path)
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# silence detect(set default queue in and out)
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try:
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command = ['silan', '-f', 'JSON', md['path']]
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proc = subprocess.Popen(command, stdout=subprocess.PIPE)
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out = proc.stdout.read()
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info = json.loads(out)
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md['cuein'] = info['sound'][0][0]
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md['cueout'] = info['sound'][-1][1]
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except Exception:
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raise
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if 'title' not in md: md['title'] = u''
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return md
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class OverwriteMetadataElement(Exception):
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def __init__(self, m): self.m = m
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def __str__(self): return "Trying to overwrite: %s" % self.m
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class MetadataReader(object):
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def __init__(self):
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self.clear()
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def register_metadata(self,m):
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if m in self.__mdata_name_map:
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raise OverwriteMetadataElement(m)
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self.__mdata_name_map[m.name] = m
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d = dict( (name,m.dependencies()) for name,m in
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self.__mdata_name_map.iteritems() )
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new_list = list( toposort(d) )
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self.__metadata = [ self.__mdata_name_map[name] for name in new_list
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if name in self.__mdata_name_map]
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def clear(self):
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self.__mdata_name_map = {}
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self.__metadata = []
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def read(self, path, muta_hash):
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normalized_metadata = {}
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for mdata in self.__metadata:
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try:
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normalized_metadata[mdata.name] = mdata.read_value(
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path, muta_hash, normalized_metadata)
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except MetadataAbsent:
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if not mdata.is_optional(): raise
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return normalized_metadata
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def read_mutagen(self, path):
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return self.read(path, normalize_mutagen(path))
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global_reader = MetadataReader()
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@contextmanager
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def metadata(name):
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t = MetadataElement(name)
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yield t
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global_reader.register_metadata(t)
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