1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
#
# This sample code is a port of
# gstreamer/tests/examples/typefind/typefind.c. It is licensed
# under the terms of the GNU Library General Public License, version
# 2 or (at your option) later.
#
# Here is the original copyright header:
# Copyright (C) <2005> Stefan Kost
# Copyright (C) <2006> Tim-Philipp Müller
#
# Copyright (C) 2013 Ruby-GNOME2 Project Team
#
# 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
require "gst"
require "rexml/document"
def event_loop(pipe)
running = true
bus = pipe.bus
while running do
message = bus.poll(Gst::MessageType::ANY, Gst::CLOCK_TIME_NONE)
raise "message nil" if message.nil?
case message.type
when Gst::MessageType::EOS
running = false
when Gst::MessageType::WARNING
warning, debug = message.parse_warning
puts "Debugging info: #{debug || 'none'}"
puts "Warning: #{warning.message}"
when Gst::MessageType::ERROR
error, debug = message.parse_error
puts "Debugging info: #{debug || 'none'}"
puts "Error: #{error.message}"
running = false
end
end
end
if ARGV.length < 1
puts "usage: #{$0} <filename>"
exit(false)
end
# create a new pipeline to hold the elements
pipeline = Gst::Pipeline.new("pipeline")
raise "'pipeline' gstreamer plugin missing" if pipeline.nil?
# create a file reader
filesrc = Gst::ElementFactory.make("filesrc", "file_source")
raise "'filesrc' gstreamer plugin missing" if filesrc.nil?
filesrc.location = ARGV.first
typefind = Gst::ElementFactory.make("typefind", "typefind")
raise "'typefind' gstreamer plugin missing" if typefind.nil?
sink = Gst::ElementFactory.make("fakesink", "sink")
raise "'fakesink' gstreamer plugin missing" if sink.nil?
# add objects to the main pipeline
pipeline << filesrc << typefind << sink
typefind.signal_connect("have-type") do |element, probability, caps|
caps_str = caps.to_s
xml = REXML::Document.new
xml << REXML::XMLDecl.new
capabilities = xml.add_element("Capabilities")
cap1 = capabilities.add_element("Cap1")
cap1.add_text(caps_str)
xml.write($stdout, 2)
puts
end
filesrc >> typefind >> sink
# start playing
pipeline.play
# Run event loop listening for bus messages until EOS or ERROR
event_loop(pipeline)
# stop the bin
pipeline.stop
|
