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355 lines
13 KiB
Python
355 lines
13 KiB
Python
# -*- Mode: Python -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# discoverer.py
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# (c) 2005-2008 Edward Hervey <bilboed at bilboed dot com>
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# Discovers multimedia information on files
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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"""
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Class and functions for getting multimedia information about files
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"""
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import os.path
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import gobject
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import gst
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from gst.extend.pygobject import gsignal
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class Discoverer(gst.Pipeline):
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"""
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Discovers information about files.
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This class is event-based and needs a mainloop to work properly.
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Emits the 'discovered' signal when discovery is finished.
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The 'discovered' callback has one boolean argument, which is True if the
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file contains decodable multimedia streams.
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"""
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__gsignals__ = {
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'discovered' : (gobject.SIGNAL_RUN_FIRST,
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None,
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(gobject.TYPE_BOOLEAN, ))
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}
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mimetype = None
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audiocaps = {}
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videocaps = {}
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videowidth = 0
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videoheight = 0
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videorate = 0
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audiofloat = False
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audiorate = 0
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audiodepth = 0
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audiowidth = 0
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audiochannels = 0
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audiolength = 0L
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videolength = 0L
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is_video = False
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is_audio = False
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otherstreams = []
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finished = False
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sinknumber = 0
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tags = {}
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def __init__(self, filename, max_interleave=1.0, timeout=3000):
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"""
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filename: str; absolute path of the file to be discovered.
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max_interleave: int or float; the maximum frame interleave in seconds.
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The value must be greater than the input file frame interleave
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or the discoverer may not find out all input file's streams.
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The default value is 1 second and you shouldn't have to change it,
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changing it mean larger discovering time and bigger memory usage.
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timeout: int; duration in ms for the discovery to complete.
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"""
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gobject.GObject.__init__(self)
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self.mimetype = None
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self.audiocaps = {}
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self.videocaps = {}
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self.videowidth = 0
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self.videoheight = 0
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self.videorate = gst.Fraction(0,1)
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self.audiofloat = False
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self.audiorate = 0
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self.audiodepth = 0
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self.audiowidth = 0
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self.audiochannels = 0
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self.audiolength = 0L
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self.videolength = 0L
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self.is_video = False
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self.is_audio = False
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self.otherstreams = []
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self.finished = False
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self.tags = {}
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self._success = False
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self._nomorepads = False
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self._timeoutid = 0
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self._timeout = timeout
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self._max_interleave = max_interleave
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if not os.path.isfile(filename):
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self.debug("File '%s' does not exist, finished" % filename)
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self.finished = True
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return
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# the initial elements of the pipeline
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self.src = gst.element_factory_make("filesrc")
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self.src.set_property("location", filename)
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self.src.set_property("blocksize", 1000000)
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self.dbin = gst.element_factory_make("decodebin")
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self.add(self.src, self.dbin)
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self.src.link(self.dbin)
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self.typefind = self.dbin.get_by_name("typefind")
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# callbacks
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self.typefind.connect("have-type", self._have_type_cb)
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self.dbin.connect("new-decoded-pad", self._new_decoded_pad_cb)
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self.dbin.connect("no-more-pads", self._no_more_pads_cb)
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self.dbin.connect("unknown-type", self._unknown_type_cb)
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def _timed_out_or_eos(self):
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if (not self.is_audio and not self.is_video) or \
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(self.is_audio and not self.audiocaps) or \
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(self.is_video and not self.videocaps):
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self._finished(False)
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else:
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self._finished(True)
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def _finished(self, success=False):
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self.debug("success:%d" % success)
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self._success = success
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self.bus.remove_signal_watch()
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if self._timeoutid:
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gobject.source_remove(self._timeoutid)
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self._timeoutid = 0
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gobject.idle_add(self._stop)
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return False
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def _stop(self):
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self.debug("success:%d" % self._success)
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self.finished = True
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self.set_state(gst.STATE_READY)
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self.debug("about to emit signal")
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self.emit('discovered', self._success)
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def _bus_message_cb(self, bus, message):
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if message.type == gst.MESSAGE_EOS:
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self.debug("Got EOS")
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self._timed_out_or_eos()
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elif message.type == gst.MESSAGE_TAG:
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for key in message.parse_tag().keys():
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self.tags[key] = message.structure[key]
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elif message.type == gst.MESSAGE_ERROR:
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self.debug("Got error")
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self._finished()
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def discover(self):
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"""Find the information on the given file asynchronously"""
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self.debug("starting discovery")
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if self.finished:
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self.emit('discovered', False)
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return
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self.bus = self.get_bus()
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self.bus.add_signal_watch()
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self.bus.connect("message", self._bus_message_cb)
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# 3s timeout
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self._timeoutid = gobject.timeout_add(self._timeout, self._timed_out_or_eos)
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self.info("setting to PLAY")
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if not self.set_state(gst.STATE_PLAYING):
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self._finished()
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def _time_to_string(self, value):
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"""
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transform a value in nanoseconds into a human-readable string
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"""
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ms = value / gst.MSECOND
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sec = ms / 1000
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ms = ms % 1000
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min = sec / 60
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sec = sec % 60
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return "%2dm %2ds %3d" % (min, sec, ms)
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def print_info(self):
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"""prints out the information on the given file"""
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if not self.finished:
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return
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if not self.mimetype:
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print "Unknown media type"
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return
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print "Mime Type :\t", self.mimetype
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if not self.is_video and not self.is_audio:
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return
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print "Length :\t", self._time_to_string(max(self.audiolength, self.videolength))
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print "\tAudio:", self._time_to_string(self.audiolength), "\tVideo:", self._time_to_string(self.videolength)
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if self.is_video and self.videorate:
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print "Video :"
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print "\t%d x %d @ %d/%d fps" % (self.videowidth,
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self.videoheight,
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self.videorate.num, self.videorate.denom)
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if self.tags.has_key("video-codec"):
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print "\tCodec :", self.tags["video-codec"]
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if self.is_audio:
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print "Audio :"
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if self.audiofloat:
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print "\t%d channels(s) : %dHz @ %dbits (float)" % (self.audiochannels,
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self.audiorate,
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self.audiowidth)
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else:
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print "\t%d channels(s) : %dHz @ %dbits (int)" % (self.audiochannels,
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self.audiorate,
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self.audiodepth)
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if self.tags.has_key("audio-codec"):
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print "\tCodec :", self.tags["audio-codec"]
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for stream in self.otherstreams:
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if not stream == self.mimetype:
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print "Other unsuported Multimedia stream :", stream
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if self.tags:
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print "Additional information :"
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for tag in self.tags.keys():
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print "%20s :\t" % tag, self.tags[tag]
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def _no_more_pads_cb(self, dbin):
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self.info("no more pads")
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self._nomorepads = True
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def _unknown_type_cb(self, dbin, pad, caps):
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self.debug("unknown type : %s" % caps.to_string())
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# if we get an unknown type and we don't already have an
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# audio or video pad, we are finished !
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self.otherstreams.append(caps.to_string())
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if not self.is_video and not self.is_audio:
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self.finished = True
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self._finished()
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def _have_type_cb(self, typefind, prob, caps):
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self.mimetype = caps.to_string()
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def _notify_caps_cb(self, pad, args):
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caps = pad.get_negotiated_caps()
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if not caps:
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pad.info("no negotiated caps available")
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return
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pad.info("caps:%s" % caps.to_string())
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# the caps are fixed
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# We now get the total length of that stream
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q = gst.query_new_duration(gst.FORMAT_TIME)
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pad.info("sending duration query")
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if pad.get_peer().query(q):
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format, length = q.parse_duration()
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if format == gst.FORMAT_TIME:
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pad.info("got duration (time) : %s" % (gst.TIME_ARGS(length),))
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else:
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pad.info("got duration : %d [format:%d]" % (length, format))
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else:
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length = -1
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gst.warning("duration query failed")
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# We store the caps and length in the proper location
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if "audio" in caps.to_string():
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self.audiocaps = caps
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self.audiolength = length
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self.audiorate = caps[0]["rate"]
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self.audiowidth = caps[0]["width"]
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self.audiochannels = caps[0]["channels"]
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if "x-raw-float" in caps.to_string():
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self.audiofloat = True
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else:
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self.audiodepth = caps[0]["depth"]
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if self._nomorepads and ((not self.is_video) or self.videocaps):
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self._finished(True)
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elif "video" in caps.to_string():
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self.videocaps = caps
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self.videolength = length
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self.videowidth = caps[0]["width"]
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self.videoheight = caps[0]["height"]
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self.videorate = caps[0]["framerate"]
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if self._nomorepads and ((not self.is_audio) or self.audiocaps):
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self._finished(True)
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def _new_decoded_pad_cb(self, dbin, pad, is_last):
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# Does the file contain got audio or video ?
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caps = pad.get_caps()
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gst.info("caps:%s" % caps.to_string())
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if "audio" in caps.to_string():
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self.is_audio = True
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elif "video" in caps.to_string():
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self.is_video = True
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else:
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self.warning("got a different caps.. %s" % caps.to_string())
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return
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if is_last and not self.is_video and not self.is_audio:
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self.debug("is last, not video or audio")
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self._finished(False)
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return
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# we connect a fakesink to the new pad...
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pad.info("adding queue->fakesink")
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fakesink = gst.element_factory_make("fakesink", "fakesink%d-%s" %
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(self.sinknumber, "audio" in caps.to_string() and "audio" or "video"))
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self.sinknumber += 1
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queue = gst.element_factory_make("queue")
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# we want the queue to buffer up to the specified amount of data
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# before outputting. This enables us to cope with formats
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# that don't create their source pads straight away,
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# but instead wait for the first buffer of that stream.
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# The specified time must be greater than the input file
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# frame interleave for the discoverer to work properly.
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queue.props.min_threshold_time = int(self._max_interleave * gst.SECOND)
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queue.props.max_size_time = int(2 * self._max_interleave * gst.SECOND)
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queue.props.max_size_bytes = 0
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# If durations are bad on the buffers (common for video decoders), we'll
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# never reach the min_threshold_time or max_size_time. So, set a
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# max size in buffers, and if reached, disable the min_threshold_time.
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# This ensures we don't fail to discover with various ffmpeg
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# demuxers/decoders that provide bogus (or no) duration.
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queue.props.max_size_buffers = int(100 * self._max_interleave)
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def _disable_min_threshold_cb(queue):
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queue.props.min_threshold_time = 0
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queue.disconnect(signal_id)
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signal_id = queue.connect('overrun', _disable_min_threshold_cb)
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self.add(fakesink, queue)
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queue.link(fakesink)
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sinkpad = fakesink.get_pad("sink")
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queuepad = queue.get_pad("sink")
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# ... and connect a callback for when the caps are fixed
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sinkpad.connect("notify::caps", self._notify_caps_cb)
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if pad.link(queuepad):
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pad.warning("##### Couldn't link pad to queue")
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queue.set_state(gst.STATE_PLAYING)
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fakesink.set_state(gst.STATE_PLAYING)
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gst.info('finished here')
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