Python GStreamer src element
glennpierce at gmail.com
Mon Jan 16 09:26:35 PST 2012
Looking again I suspect I have to use python struct like
I will experiment and post the results.
On 16 January 2012 15:09, Glenn Pierce <glennpierce at gmail.com> wrote:
> I didn't want to high jack the thread from Mahendra about writing a
> src plugin in Python. However, I sure it would help him as well.
> I am also trying to create an element src in Python. I have found the
> following code at
> This seems to work when placed into a pipeline with a fake sink.
> To extend this example and learn more I have decided to try to play a
> sine wave. (Ultimately I wan't to pass data from a text to speech
> I cant seem to find any good examples of what's need to be done in do_create.
> What I have at the moment is
> def do_create(self, offset, length):
> data = [str(math.sin(a)*255.0) for a in numpy.arange(0.0,
> 2*math.pi, 0.01)] ? # How am I meant to populate data ?
> buf = gst.Buffer(data)
> caps = gst.caps_from_string('audio/x-raw-float, rate=44100,
> channels=1, width=8')
> buf.timestamp = 0 * gst.SECOND
> buf.duration = 4 * gst.SECOND
> return gst.FLOW_OK, buf
> I basically need to know how I can populate the Buffer object with
> audio data as a string.
> Everything I try results in
> error: Internal data flow error.
> I am using to with the following pipeline to playback.
> 'acapelasrc ! audioconvert ! audioresample ! autoaudiosink'
> Any pointers would be greatly appreciated.
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