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
107
108
109
110
111
112
113
114
115
116
|
#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# GStreamer python bindings
# Copyright (C) 2002 David I. Lehn <dlehn@users.sourceforge.net>
# 2004 Johan Dahlin <johan@gnome.org>
#
# filesrc.py: implements a file source element completely in python
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 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
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library 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.
import gi
import sys
gi.require_version('Gst', '1.0')
gi.require_version('GstBase', '1.0')
from gi.repository import GLib, Gst, GObject, GstBase
if __name__ == '__main__':
Gst.init(None)
Gst.init_python()
class FileSource(GstBase.BaseSrc):
__gstmetadata__ = ('PyFileSource', 'Source',
'Custom Python filesrc example', 'Jan Schmidt')
__gsttemplates__ = (
Gst.PadTemplate.new("src",
Gst.PadDirection.SRC,
Gst.PadPresence.ALWAYS,
Gst.Caps.new_any()),
)
blocksize = 4096
fd = None
def __init__(self, name):
super().__init__()
self.curoffset = 0
self.set_name(name)
def set_property(self, name, value):
if name == 'location':
self.fd = open(value, 'rb')
def do_create(self, offset, size, wot):
if offset != self.curoffset:
self.fd.seek(offset, 0)
data = self.fd.read(self.blocksize)
if data:
self.curoffset += len(data)
return Gst.FlowReturn.OK, Gst.Buffer.new_wrapped(data)
else:
return Gst.FlowReturn.EOS, None
GObject.type_register(FileSource)
__gstelementfactory__ = ("filesrc_py", Gst.Rank.NONE, FileSource)
def main(args):
Gst.init()
if len(args) != 3:
print(f'Usage: {args[0]} input output')
return -1
bin = Gst.Pipeline('pipeline')
filesrc = FileSource('filesource')
assert filesrc
filesrc.set_property('location', args[1])
filesink = Gst.ElementFactory.make('filesink', 'sink')
filesink.set_property('location', args[2])
bin.add(filesrc, filesink)
Gst.Element.link_many(filesrc, filesink)
bin.set_state(Gst.State.PLAYING)
mainloop = GLib.MainLoop()
def bus_event(bus, message):
t = message.type
if t == Gst.MessageType.EOS:
mainloop.quit()
elif t == Gst.MessageType.ERROR:
err, debug = message.parse_error()
print(f"Error: {err}, {debug}")
mainloop.quit()
return True
bus = bin.get_bus()
bus.add_signal_watch()
bus.connect('message', bus_event)
mainloop.run()
bin.set_state(Gst.State.NULL)
if __name__ == '__main__':
sys.exit(main(sys.argv))
|
