[gst-devel] playing a playlist without stopping the sink

[Mohit Garg]

Hi Sander,

Try setting the state to GST_STATE_READY instead of GST_STATE_NULL before
changing the "location". I am not sure if this is recommended but it had
worked for me sometime back.

regards
Mohit

Personal Homepage: http://mohitgarg.vectorstar.net
Social Work: http://www.noragging.com

On 9/12/07, Sander Marechal <s.marechal at jejik.com> wrote:
>
> Hello all,
>
> I have been trying for a long time now to get a simple player working
> that can play through a playlist and obey a simple "next" command,
> without setting the pipeline to STATE_NULL (because in the final
> version, the output will be a shout2send sink[1])
>
> I've written a simplified, minimal version of my player, but I can't
> even get that to work :-( I always get gstreamer errors when I switch to
> the next song, and usually output stops alltogether. Or it hangs.
>
> I have attached my minimal player below. When you run it, simply typing
> "next" and hitting return should start playing the next song. I'm
> probably doing something fundamentally wrong here.
>
> I haven't been able to find any examples online that implement something
> similar. It's either gstreamer tutorials that do "set STATE_NULL, change
> location on filesrc, set STATE_PLAYING" or trying to comprehend the
> source of advanced players/managers that do quite complicated stuff with
> pipelines that I really don't understand.
>
> Could someone point out to me what I'm doing wrong?
>
> Thanks in advance,
>
> --
> Sander Marechal
>
> [1] When a pipeline goes to STATE_NULL, the shout2send will unmount the
> stream from icecast and all the icecast listeners get disconnected.
>
> playlist.py:
> ============
> #!/usr/bin/env python
>
> import pygst, gobject, time, sys
> pygst.require("0.10")
> import gst
>
> class AudioPlayer:
>         def __init__(self):
>                 self.songs = [
>                         'music/Ozzy/Mr. Tinkertrain.mp3',
>                         'music/Ozzy/I Don\'t Want to Change the World.mp3
> ',
>                         'music/Ozzy/Mama, I\'m Coming Home.mp3 ',
>                         'music/Ozzy/Desire.mp3',
>                         'music/Ozzy/No More Tears.mp3 ',
>                         'music/Ozzy/S.I.N..mp3',
>                         'music/Ozzy/Hellraiser.mp3',
>                 ]
>
>                 # create a new gstreamer pipeline
>                 self.pipeline = gst.Pipeline("mypipeline")
>
>                 # add a file source to the pipeline
>                 self.filesrc = gst.element_factory_make("filesrc",
> "source")
>                 self.pipeline.add(self.filesrc)
>
>                 # add a generic decoder to the pipeline and link it to the
> source
>                 self.decode = gst.element_factory_make("decodebin",
> "decode")
>                 self.decode.connect("new-decoded-pad", self.decode_link)
>                 self.pipeline.add(self.decode)
>                 self.filesrc.link(self.decode)
>
>                 # add a convertor to the pipeline
>                 self.convert = gst.element_factory_make("audioconvert",
> "convert")
>                 self.pipeline.add(self.convert)
>
>                 # add an alsa sink to the pipeline and link it to the
> convertor
>                 self.sink = gst.element_factory_make("alsasink", "sink")
>                 self.pipeline.add(self.sink)
>                 self.convert.link(self.sink)
>
>                 # start playing
>                 self.filesrc.set_property("location", self.songs.pop(0))
>                 self.pipeline.set_state(gst.STATE_PLAYING)
>
>         def decode_link(self, dbin, pad, islast):
>                 pad.link(self.convert.get_pad("sink"))
>
>         def next(self):
>                 self.convert.unlink(self.sink)
>                 self.filesrc.set_state(gst.STATE_NULL)
>                 self.filesrc.set_property("location", self.songs.pop(0))
>                 self.convert.link(self.sink)
>                 self.pipeline.set_state(gst.STATE_PLAYING)
>                 return True
>
> player = AudioPlayer()
> loop = gobject.MainLoop()
> gobject.threads_init()
> context = loop.get_context()
>
> while 1:
>         value = sys.stdin.readline()
>         if value == "next\n":
>                 player.next()
>         context.iteration(True)
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2005.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20070912/58bcb1c0/attachment.htm>