Hi,
I'm trying to implement gapless playback for audio files using playbin2.
It works well when all files are valid, but there's a problem processing invalid files.
I receive an error message about file being invalid, but then I'm not sure what I need to do to continue playback with other files.
I'm trying to reset playbin state to NULL and then change the uri to a new file, but I keep getting error messages for the old invalid file, and playback doesn't resume after I set playbin back to PLAYING state.
Here's a sample python script:
validfile = "file://" + os.path.abspath("test_tone.wav") # using uncompressed PCM
invalidfile = "file://" + os.path.abspath("invalid")
class Player:
restarted = 0
def __init__(self, filename):
self.filename = filename
#this only works with playbin2
self.player = gst.element_factory_make("playbin2", "player")
self.player.set_property("uri", filename)
self.player.set_property("audio-sink", gst.element_factory_make("pulsesink", "audiosink"))
self.player.connect("about-to-finish", self.on_about_to_finish)
bus = self.player.get_bus()
bus.add_signal_watch()
bus.connect("message", self.on_message)
def run(self):
self.player.set_state(gst.STATE_PLAYING)
loop = gobject.MainLoop()
loop.run()
def on_about_to_finish(self, player):
#The current song is about to finish, if we want to play another
#song after this, we have to do that now
print "about-to-finish, setting uri to file:", invalidfile
player.set_property("uri", invalidfile)
def on_message(self, bus, message):
if message.type == gst.MESSAGE_ERROR:
err, debug = message.parse_error()
print "Error:" , err
if self.restarted == 0:
self.restarted = 1
print "Attempt to restart the playbin with file:", validfile
self.player.set_state(gst.STATE_NULL)
self.player.set_property("uri", validfile)
self.player.set_state(gst.STATE_PLAYING)
if __name__ == "__main__":
gobject.threads_init()
player = Player(validfile)
player.run()
According to documentation for playbin2:
"When playback has finished (an EOS message has been received on the bus) or an error has occured (an ERROR message has been received on the bus) or the user wants to play a different track, playbin should be set back to READY or NULL state, then the "uri" property should be set to the new location and then playbin be set to PLAYING state again."
I've submitted a bug some time ago:
https://bugzilla.gnome.org/show_bug.cgi?id=673888But haven't got any response yet.
I saw some projects (e.g. Banshee) are destroying the pipeline on error. Is it something I have to do? Is there a way to avoid this and reuse the pipeline?
Thank you,
Lev
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