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
100
101
102
103
104
105
106
|
#!/usr/bin/env ruby
# -*- coding: utf-8 -*-
#
# This sample code is a port of
# gstreamer/tests/examples/streams/stream-status.c. It is licensed
# under the terms of the GNU Library General Public License, version
# 2 or (at your option) later.
#
# 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"
def event_loop(bus, pipe)
loop do
message = bus.poll(Gst::MessageType::ANY, Gst::CLOCK_TIME_NONE)
raise "message nil" if message.nil?
case message.type
when Gst::MessageType::EOS
puts "received EOS"
return
when Gst::MessageType::WARNING
warning, debug = message.parse_warning
puts "#{message} #{warning.message}"
when Gst::MessageType::ERROR
error, debug = message.parse_error
puts "#{message} #{error.message}"
return
end
end
end
# create a new bin to hold the elements
bin = Gst::Pipeline.new("pipeline")
raise "'pipeline' gstreamer plugin missing" if bin.nil?
# create a source
fakesrc = Gst::ElementFactory.make("fakesrc", "fakesrc")
raise "'fakesrc' gstreamer plugin missing" if fakesrc.nil?
# and a sink
fakesink = Gst::ElementFactory.make("fakesink", "fakesink")
raise "'fakesink' gstreamer plugin missing" if fakesink.nil?
# add objects to the main pipeline
bin << fakesrc << fakesink
# link the elements
fakesrc >> fakesink
# get the bus, we need to install a sync handler
bin.bus.sync_handler do |bus, message|
case message.type
when Gst::MessageType::STREAM_STATUS
type, owner = message.parse_stream_status
val = message.stream_status_object
puts "type: #{type.inspect}"
puts "source: #{message.src.path_string}"
puts "owner: #{owner.path_string}"
puts "object: type #{val.type.name}, value #{val.value}"
# see if we know how to deal with this object
if val.type == Gst::Task.gtype
task = val.value
end
case type
when Gst::StreamStatusType::CREATE
puts "created task #{task}"
when Gst::StreamStatusType::ENTER
# puts "raising task priority"
# setpriority(PRIO_PROCESS, 0, -10)
when Gst::StreamStatusType::LEAVE
end
end
Gst::BusSyncReply::PASS
end
# start playing
bin.play
# run event loop listening for bus messages until EOS or ERROR
event_loop(bin.bus, bin)
# stop the bin
bin.stop
|
