mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-19 23:06:49 +00:00
355 lines
13 KiB
Python
355 lines
13 KiB
Python
# -*- Mode: Python -*-
|
|
# vi:si:et:sw=4:sts=4:ts=4
|
|
|
|
# discoverer.py
|
|
# (c) 2005-2008 Edward Hervey <bilboed at bilboed dot com>
|
|
# Discovers multimedia information on files
|
|
|
|
# This library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
#
|
|
# This library 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
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with this library; if not, write to the Free Software
|
|
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
"""
|
|
Class and functions for getting multimedia information about files
|
|
"""
|
|
|
|
import os.path
|
|
|
|
import gobject
|
|
|
|
import gst
|
|
|
|
from gst.extend.pygobject import gsignal
|
|
|
|
class Discoverer(gst.Pipeline):
|
|
"""
|
|
Discovers information about files.
|
|
This class is event-based and needs a mainloop to work properly.
|
|
Emits the 'discovered' signal when discovery is finished.
|
|
|
|
The 'discovered' callback has one boolean argument, which is True if the
|
|
file contains decodable multimedia streams.
|
|
"""
|
|
__gsignals__ = {
|
|
'discovered' : (gobject.SIGNAL_RUN_FIRST,
|
|
None,
|
|
(gobject.TYPE_BOOLEAN, ))
|
|
}
|
|
|
|
mimetype = None
|
|
|
|
audiocaps = {}
|
|
videocaps = {}
|
|
|
|
videowidth = 0
|
|
videoheight = 0
|
|
videorate = 0
|
|
|
|
audiofloat = False
|
|
audiorate = 0
|
|
audiodepth = 0
|
|
audiowidth = 0
|
|
audiochannels = 0
|
|
|
|
audiolength = 0L
|
|
videolength = 0L
|
|
|
|
is_video = False
|
|
is_audio = False
|
|
|
|
otherstreams = []
|
|
|
|
finished = False
|
|
sinknumber = 0
|
|
tags = {}
|
|
|
|
|
|
def __init__(self, filename, max_interleave=1.0, timeout=3000):
|
|
"""
|
|
filename: str; absolute path of the file to be discovered.
|
|
max_interleave: int or float; the maximum frame interleave in seconds.
|
|
The value must be greater than the input file frame interleave
|
|
or the discoverer may not find out all input file's streams.
|
|
The default value is 1 second and you shouldn't have to change it,
|
|
changing it mean larger discovering time and bigger memory usage.
|
|
timeout: int; duration in ms for the discovery to complete.
|
|
"""
|
|
gobject.GObject.__init__(self)
|
|
|
|
self.mimetype = None
|
|
|
|
self.audiocaps = {}
|
|
self.videocaps = {}
|
|
|
|
self.videowidth = 0
|
|
self.videoheight = 0
|
|
self.videorate = gst.Fraction(0,1)
|
|
|
|
self.audiofloat = False
|
|
self.audiorate = 0
|
|
self.audiodepth = 0
|
|
self.audiowidth = 0
|
|
self.audiochannels = 0
|
|
|
|
self.audiolength = 0L
|
|
self.videolength = 0L
|
|
|
|
self.is_video = False
|
|
self.is_audio = False
|
|
|
|
self.otherstreams = []
|
|
|
|
self.finished = False
|
|
self.tags = {}
|
|
self._success = False
|
|
self._nomorepads = False
|
|
|
|
self._timeoutid = 0
|
|
self._timeout = timeout
|
|
self._max_interleave = max_interleave
|
|
|
|
if not os.path.isfile(filename):
|
|
self.debug("File '%s' does not exist, finished" % filename)
|
|
self.finished = True
|
|
return
|
|
|
|
# the initial elements of the pipeline
|
|
self.src = gst.element_factory_make("filesrc")
|
|
self.src.set_property("location", filename)
|
|
self.src.set_property("blocksize", 1000000)
|
|
self.dbin = gst.element_factory_make("decodebin")
|
|
self.add(self.src, self.dbin)
|
|
self.src.link(self.dbin)
|
|
self.typefind = self.dbin.get_by_name("typefind")
|
|
|
|
# callbacks
|
|
self.typefind.connect("have-type", self._have_type_cb)
|
|
self.dbin.connect("new-decoded-pad", self._new_decoded_pad_cb)
|
|
self.dbin.connect("no-more-pads", self._no_more_pads_cb)
|
|
self.dbin.connect("unknown-type", self._unknown_type_cb)
|
|
|
|
def _timed_out_or_eos(self):
|
|
if (not self.is_audio and not self.is_video) or \
|
|
(self.is_audio and not self.audiocaps) or \
|
|
(self.is_video and not self.videocaps):
|
|
self._finished(False)
|
|
else:
|
|
self._finished(True)
|
|
|
|
def _finished(self, success=False):
|
|
self.debug("success:%d" % success)
|
|
self._success = success
|
|
self.bus.remove_signal_watch()
|
|
if self._timeoutid:
|
|
gobject.source_remove(self._timeoutid)
|
|
self._timeoutid = 0
|
|
gobject.idle_add(self._stop)
|
|
return False
|
|
|
|
def _stop(self):
|
|
self.debug("success:%d" % self._success)
|
|
self.finished = True
|
|
self.set_state(gst.STATE_READY)
|
|
self.debug("about to emit signal")
|
|
self.emit('discovered', self._success)
|
|
|
|
def _bus_message_cb(self, bus, message):
|
|
if message.type == gst.MESSAGE_EOS:
|
|
self.debug("Got EOS")
|
|
self._timed_out_or_eos()
|
|
elif message.type == gst.MESSAGE_TAG:
|
|
for key in message.parse_tag().keys():
|
|
self.tags[key] = message.structure[key]
|
|
elif message.type == gst.MESSAGE_ERROR:
|
|
self.debug("Got error")
|
|
self._finished()
|
|
|
|
def discover(self):
|
|
"""Find the information on the given file asynchronously"""
|
|
self.debug("starting discovery")
|
|
if self.finished:
|
|
self.emit('discovered', False)
|
|
return
|
|
|
|
self.bus = self.get_bus()
|
|
self.bus.add_signal_watch()
|
|
self.bus.connect("message", self._bus_message_cb)
|
|
|
|
# 3s timeout
|
|
self._timeoutid = gobject.timeout_add(self._timeout, self._timed_out_or_eos)
|
|
|
|
self.info("setting to PLAY")
|
|
if not self.set_state(gst.STATE_PLAYING):
|
|
self._finished()
|
|
|
|
def _time_to_string(self, value):
|
|
"""
|
|
transform a value in nanoseconds into a human-readable string
|
|
"""
|
|
ms = value / gst.MSECOND
|
|
sec = ms / 1000
|
|
ms = ms % 1000
|
|
min = sec / 60
|
|
sec = sec % 60
|
|
return "%2dm %2ds %3d" % (min, sec, ms)
|
|
|
|
def print_info(self):
|
|
"""prints out the information on the given file"""
|
|
if not self.finished:
|
|
return
|
|
if not self.mimetype:
|
|
print "Unknown media type"
|
|
return
|
|
print "Mime Type :\t", self.mimetype
|
|
if not self.is_video and not self.is_audio:
|
|
return
|
|
print "Length :\t", self._time_to_string(max(self.audiolength, self.videolength))
|
|
print "\tAudio:", self._time_to_string(self.audiolength), "\tVideo:", self._time_to_string(self.videolength)
|
|
if self.is_video and self.videorate:
|
|
print "Video :"
|
|
print "\t%d x %d @ %d/%d fps" % (self.videowidth,
|
|
self.videoheight,
|
|
self.videorate.num, self.videorate.denom)
|
|
if self.tags.has_key("video-codec"):
|
|
print "\tCodec :", self.tags["video-codec"]
|
|
if self.is_audio:
|
|
print "Audio :"
|
|
if self.audiofloat:
|
|
print "\t%d channels(s) : %dHz @ %dbits (float)" % (self.audiochannels,
|
|
self.audiorate,
|
|
self.audiowidth)
|
|
else:
|
|
print "\t%d channels(s) : %dHz @ %dbits (int)" % (self.audiochannels,
|
|
self.audiorate,
|
|
self.audiodepth)
|
|
if self.tags.has_key("audio-codec"):
|
|
print "\tCodec :", self.tags["audio-codec"]
|
|
for stream in self.otherstreams:
|
|
if not stream == self.mimetype:
|
|
print "Other unsuported Multimedia stream :", stream
|
|
if self.tags:
|
|
print "Additional information :"
|
|
for tag in self.tags.keys():
|
|
print "%20s :\t" % tag, self.tags[tag]
|
|
|
|
def _no_more_pads_cb(self, dbin):
|
|
self.info("no more pads")
|
|
self._nomorepads = True
|
|
|
|
def _unknown_type_cb(self, dbin, pad, caps):
|
|
self.debug("unknown type : %s" % caps.to_string())
|
|
# if we get an unknown type and we don't already have an
|
|
# audio or video pad, we are finished !
|
|
self.otherstreams.append(caps.to_string())
|
|
if not self.is_video and not self.is_audio:
|
|
self.finished = True
|
|
self._finished()
|
|
|
|
def _have_type_cb(self, typefind, prob, caps):
|
|
self.mimetype = caps.to_string()
|
|
|
|
def _notify_caps_cb(self, pad, args):
|
|
caps = pad.get_negotiated_caps()
|
|
if not caps:
|
|
pad.info("no negotiated caps available")
|
|
return
|
|
pad.info("caps:%s" % caps.to_string())
|
|
# the caps are fixed
|
|
# We now get the total length of that stream
|
|
q = gst.query_new_duration(gst.FORMAT_TIME)
|
|
pad.info("sending duration query")
|
|
if pad.get_peer().query(q):
|
|
format, length = q.parse_duration()
|
|
if format == gst.FORMAT_TIME:
|
|
pad.info("got duration (time) : %s" % (gst.TIME_ARGS(length),))
|
|
else:
|
|
pad.info("got duration : %d [format:%d]" % (length, format))
|
|
else:
|
|
length = -1
|
|
gst.warning("duration query failed")
|
|
|
|
# We store the caps and length in the proper location
|
|
if "audio" in caps.to_string():
|
|
self.audiocaps = caps
|
|
self.audiolength = length
|
|
self.audiorate = caps[0]["rate"]
|
|
self.audiowidth = caps[0]["width"]
|
|
self.audiochannels = caps[0]["channels"]
|
|
if "x-raw-float" in caps.to_string():
|
|
self.audiofloat = True
|
|
else:
|
|
self.audiodepth = caps[0]["depth"]
|
|
if self._nomorepads and ((not self.is_video) or self.videocaps):
|
|
self._finished(True)
|
|
elif "video" in caps.to_string():
|
|
self.videocaps = caps
|
|
self.videolength = length
|
|
self.videowidth = caps[0]["width"]
|
|
self.videoheight = caps[0]["height"]
|
|
self.videorate = caps[0]["framerate"]
|
|
if self._nomorepads and ((not self.is_audio) or self.audiocaps):
|
|
self._finished(True)
|
|
|
|
def _new_decoded_pad_cb(self, dbin, pad, is_last):
|
|
# Does the file contain got audio or video ?
|
|
caps = pad.get_caps()
|
|
gst.info("caps:%s" % caps.to_string())
|
|
if "audio" in caps.to_string():
|
|
self.is_audio = True
|
|
elif "video" in caps.to_string():
|
|
self.is_video = True
|
|
else:
|
|
self.warning("got a different caps.. %s" % caps.to_string())
|
|
return
|
|
if is_last and not self.is_video and not self.is_audio:
|
|
self.debug("is last, not video or audio")
|
|
self._finished(False)
|
|
return
|
|
# we connect a fakesink to the new pad...
|
|
pad.info("adding queue->fakesink")
|
|
fakesink = gst.element_factory_make("fakesink", "fakesink%d-%s" %
|
|
(self.sinknumber, "audio" in caps.to_string() and "audio" or "video"))
|
|
self.sinknumber += 1
|
|
queue = gst.element_factory_make("queue")
|
|
# we want the queue to buffer up to the specified amount of data
|
|
# before outputting. This enables us to cope with formats
|
|
# that don't create their source pads straight away,
|
|
# but instead wait for the first buffer of that stream.
|
|
# The specified time must be greater than the input file
|
|
# frame interleave for the discoverer to work properly.
|
|
queue.props.min_threshold_time = int(self._max_interleave * gst.SECOND)
|
|
queue.props.max_size_time = int(2 * self._max_interleave * gst.SECOND)
|
|
queue.props.max_size_bytes = 0
|
|
|
|
# If durations are bad on the buffers (common for video decoders), we'll
|
|
# never reach the min_threshold_time or max_size_time. So, set a
|
|
# max size in buffers, and if reached, disable the min_threshold_time.
|
|
# This ensures we don't fail to discover with various ffmpeg
|
|
# demuxers/decoders that provide bogus (or no) duration.
|
|
queue.props.max_size_buffers = int(100 * self._max_interleave)
|
|
def _disable_min_threshold_cb(queue):
|
|
queue.props.min_threshold_time = 0
|
|
queue.disconnect(signal_id)
|
|
signal_id = queue.connect('overrun', _disable_min_threshold_cb)
|
|
|
|
self.add(fakesink, queue)
|
|
queue.link(fakesink)
|
|
sinkpad = fakesink.get_pad("sink")
|
|
queuepad = queue.get_pad("sink")
|
|
# ... and connect a callback for when the caps are fixed
|
|
sinkpad.connect("notify::caps", self._notify_caps_cb)
|
|
if pad.link(queuepad):
|
|
pad.warning("##### Couldn't link pad to queue")
|
|
queue.set_state(gst.STATE_PLAYING)
|
|
fakesink.set_state(gst.STATE_PLAYING)
|
|
gst.info('finished here')
|