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https://github.com/matthew1000/gstreamer-cheat-sheet.git
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70 lines
2.2 KiB
Python
70 lines
2.2 KiB
Python
#!/usr/bin/env python
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#
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# Plays any URI to screen. And shows how to handle buffering.
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#
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# Make sure the environment variable SRC is set to a playable file
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# e.g.
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# export SRC='file:///tmp/me.mp4'
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#
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import gi
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gi.require_version('Gst', '1.0')
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from gi.repository import GObject, Gst
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import os
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Gst.init(None)
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mainloop = GObject.MainLoop()
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pipeline = None
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def on_state_change(bus, message):
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is_pipeline_state_change = isinstance(message.src, Gst.Pipeline)
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if is_pipeline_state_change:
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old_state, new_state, pending_state = message.parse_state_changed()
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print('State is now %s' % new_state.value_nick.upper())
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if new_state == Gst.State.PAUSED:
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consider_move_to_playing_if_not_buffering()
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def consider_move_to_playing_if_not_buffering():
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query_buffer = Gst.Query.new_buffering(Gst.Format.PERCENT)
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result = pipeline.query(query_buffer)
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if result:
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result_parsed = query_buffer.parse_buffering_percent()
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buffering_is_busy = result_parsed.busy
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if not buffering_is_busy:
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pipeline.set_state(Gst.State.PLAYING)
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def on_error(bus, message):
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print('ERROR:', message.parse_error())
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def on_buffering(bus, message):
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if pipeline.get_state(0)[1] in [Gst.State.PAUSED, Gst.State.PLAYING]:
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buffering_percent = message.parse_buffering()
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print('Buffering %d%%' % buffering_percent)
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if pipeline.get_state(0)[1] == Gst.State.PAUSED and buffering_percent == 100:
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pipeline.set_state(Gst.State.PLAYING)
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# The percentage goes to 0 too soon. So setting back to PAUSED can cause a needless streamingn blip.
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# if pipeline.get_state(0)[1] == Gst.State.PLAYING and buffering_percent == 0:
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# pipeline.set_state(Gst.State.PAUSED)
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def go():
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global pipeline
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pipeline = Gst.ElementFactory.make('playbin')
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pipeline.set_property('uri', os.environ['SRC'])
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# How large a buffer would you like?
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pipeline.set_property('buffer-duration', 3 * Gst.SECOND)
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bus = pipeline.get_bus()
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bus.add_signal_watch()
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bus.connect('message::buffering', on_buffering)
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bus.connect('message::state-changed', on_state_change)
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bus.connect('message::error', on_error)
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pipeline.set_state(Gst.State.PAUSED)
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mainloop.run()
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go()
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