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#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# gstfile.py
# (c) 2005 Edward Hervey <edward at fluendo dot com>
# Discovers and prints out multimedia information of files
# This example shows how to use gst-python:
# _ in an object-oriented way (Discoverer class)
# _ subclassing a gst.Pipeline
# _ and overidding existing methods (do_iterate())
import os
import sys
import gobject
import pygst
pygst.require('0.9')
import gst
def time_to_string(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)
class Discoverer(gst.Pipeline):
"""
Discovers information about files
"""
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
tags = {}
def __init__(self, filename):
gobject.GObject.__init__(self)
self.mimetype = None
self.audiocaps = {}
self.videocaps = {}
self.videowidth = 0
self.videoheight = 0
self.videorate = 0
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 = {}
if not os.path.isfile(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("unknown-type", self._unknown_type_cb)
self.discover()
def discover(self):
"""iterate on ourself to find the information on the given file"""
if self.finished:
return
self.info("setting to PLAY")
if not self.set_state(gst.STATE_PLAYING):
# the pipeline wasn't able to be set to playing
self.finished = True
return
bus = self.get_bus()
while 1:
if self.finished:
self.debug("self.finished, stopping")
break
msg = bus.poll(gst.MESSAGE_ANY, gst.SECOND)
if not msg:
print "got empty message..."
break
if msg.type & gst.MESSAGE_STATE_CHANGED:
pass
elif msg.type & gst.MESSAGE_EOS:
break
elif msg.type & gst.MESSAGE_TAG:
for key in msg.parse_tag().keys():
self.tags[key] = msg.structure[key]
elif msg.type & gst.MESSAGE_ERROR:
print "whooops, error", msg.parse_error()
break
self.set_state(gst.STATE_PAUSED)
self.set_state(gst.STATE_READY)
self.finished = True
def print_info(self):
"""prints out the information on the given file"""
if not self.finished:
self.discover()
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", time_to_string(max(self.audiolength, self.videolength))
print "\tAudio:", time_to_string(self.audiolength), "\tVideo:", time_to_string(self.videolength)
if self.is_video:
print "Video :"
print "\t%d x %d @ %.2f fps" % (self.videowidth,
self.videoheight,
self.videorate)
if self.tags.has_key("video-codec"):
print "\tCodec :", self.tags.pop("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.pop("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 _unknown_type_cb(self, dbin, pad, caps):
print "unknown type", 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
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:
return
# the caps are fixed
# We now get the total length of that stream
q = gst.query_new_duration(gst.FORMAT_TIME)
pad.info("sending position query")
if pad.get_peer().query(q):
format, length = q.parse_duration()
pad.info("got position query answer : %d:%d" % (length, format))
else:
gst.warning("position query didn't work")
# 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 (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 (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:
print "got a different caps..", caps
return
if is_last and not self.is_video and not self.is_audio:
self.finished = True
return
# we connect a fakesink to the new pad...
pad.info("adding queue->fakesink")
fakesink = gst.element_factory_make("fakesink")
queue = gst.element_factory_make("queue")
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')
def _found_tag_cb(self, dbin, source, tags):
self.tags.update(tags)
gobject.type_register(Discoverer)
def main(args):
if len(args) < 2:
print 'usage: %s files...' % args[0]
return 2
if len(args[1:]) > 1:
for filename in args[1:]:
print "File :", filename
Discoverer(filename).print_info()
print "\n"
else:
Discoverer(args[1]).print_info()
if __name__ == '__main__':
sys.exit(main(sys.argv))
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