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python: Add a GstDiscoverer example
Port the old gst-discover example to 1.0 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5187>
This commit is contained in:
Jan Schmidt
GStreamer Marge Bot
parent
df7e8db84c
commit
f46831a51d
2 changed files with 107 additions and 89 deletions
107
subprojects/gst-python/examples/gst-discover
Executable file
107
subprojects/gst-python/examples/gst-discover
Executable file
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#!/usr/bin/env python
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# gst-python
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# Copyright (C) 2006 Andy Wingo <wingo at pobox.com>
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# Copyright (C) 2023 Jan Schmidt <jan at centricular.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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import os
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import sys
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import gi
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gi.require_version("GLib", "2.0")
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gi.require_version("Gst", "1.0")
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gi.require_version("GstPbutils", "1.0")
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from gi.repository import GLib, Gst, GstPbutils
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def fail(path, info):
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error = info.get_result()
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print(f"Discovery of {path} failed with result {error}")
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sys.exit(1)
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def print_stream_info(stream_info, depth):
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indent = " "*depth
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stream_type = stream_info.get_stream_type_nick()
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stream_num = stream_info.get_stream_number()
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stream_id = stream_info.get_stream_id()
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caps = stream_info.get_caps()
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print(f"{indent}{stream_type} #{stream_num}: {caps}")
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print(f"{indent} Stream ID: {stream_id}")
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tags = stream_info.get_tags()
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if tags is not None:
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print(f"{indent} Tags: ")
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for (key, tag) in tags.enumerate():
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print(f"{indent} {key}: {tag}")
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if isinstance(stream_info, GstPbutils.DiscovererVideoInfo) or isinstance(stream_info, GstPbutils.DiscovererAudioInfo):
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print(f"{indent}Bitrate: {stream_info.get_bitrate()}")
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print(f"{indent}Max Bitrate: {stream_info.get_max_bitrate()}")
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print()
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def print_topology(stream_info, depth):
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print_stream_info(stream_info, depth)
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next = stream_info.get_next()
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if next is not None:
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print_topology (next, depth + 2);
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elif isinstance(stream_info, GstPbutils.DiscovererContainerInfo):
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streams = stream_info.get_streams()
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for tmpinf in streams:
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print_topology (tmpinf, depth + 2);
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def succeed(info):
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print(f"URI: {info.get_uri()}")
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# Print properties
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duration = info.get_duration()
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seekable = info.get_seekable()
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is_live = info.get_live()
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print(f"Duration: {Gst.TIME_ARGS(duration)}\nSeekable: {seekable}\nLive: {is_live}")
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print_topology(info.get_stream_info(), 0)
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sys.exit(0)
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def discover(path):
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def discovered(d, info, err):
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if info.get_result() == GstPbutils.DiscovererResult.OK:
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succeed(info)
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else:
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fail(path, info)
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d = GstPbutils.Discoverer.new(5 * Gst.SECOND)
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d.connect('discovered', discovered)
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d.start()
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d.discover_uri_async(path)
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GLib.MainLoop().run()
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def usage():
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print("usage: gst-discover PATH-TO-MEDIA-FILE", file=sys.stderr)
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sys.exit(1)
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def main(argv):
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if len(argv) != 2:
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usage()
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path = argv.pop()
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if not os.path.isfile(path):
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print(f"error: file {path} does not exist", file=sys.stderr)
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usage()
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Gst.init(sys.argv)
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return discover('file://' + os.path.abspath(path))
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if __name__ == '__main__':
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sys.exit(main(sys.argv))
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@ -1,89 +0,0 @@
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#!/usr/bin/env python
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# gst-python
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# Copyright (C) 2006 Andy Wingo <wingo at pobox.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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import os
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import sys
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import pygtk
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pygtk.require('2.0')
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import gobject
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gobject.threads_init()
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import pygst
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pygst.require('0.10')
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import gst
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from gst.extend import discoverer
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def fail(path):
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print "error: %r does not appear to be a media file" % path
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sys.exit(1)
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def succeed(d):
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def pp(prop, val):
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print '%s: %s' % (prop, val)
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pp('media type', d.mimetype)
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pp('has video', d.is_video)
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if d.is_video:
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pp('video caps', d.videocaps)
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pp('video width (pixels)', d.videowidth)
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pp('video height (pixels)', d.videoheight)
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pp('video length (hh:mm:ss)', gst.TIME_ARGS(d.videolength))
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pp('framerate (fps)', '%s/%s' % (d.videorate.num, d.videorate.denom))
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pp('has audio', d.is_audio)
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if d.is_audio:
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pp('audio caps', d.audiocaps)
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pp('audio format', d.audiofloat and 'floating-point' or 'integer')
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pp('sample rate (Hz)', d.audiorate)
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pp('sample width (bits)', d.audiowidth)
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pp('sample depth (bits)', d.audiodepth)
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pp('audio length (hh:mm:ss)', gst.TIME_ARGS(d.audiolength))
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pp('audio channels', d.audiochannels)
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sys.exit(0)
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def discover(path):
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def discovered(d, is_media):
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if is_media:
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succeed(d)
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else:
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fail(path)
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d = discoverer.Discoverer(path)
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d.connect('discovered', discovered)
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d.discover()
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gobject.MainLoop().run()
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def usage():
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print >>sys.stderr, "usage: gst-discover PATH-TO-MEDIA-FILE"
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sys.exit(1)
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def main(argv):
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if len(argv) != 2:
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usage()
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path = argv.pop()
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if not os.path.isfile(path):
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print >>sys.stderr, "error: file %r does not exist" % path
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usage()
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return discover(path)
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if __name__ == '__main__':
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sys.exit(main(sys.argv))
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