Gst.sample Gst.Buffer data appsink

[troywang]

Hi all:
I use appsink to get data from pipeline in python-gstreamer1.0,and now I can
get Gst.Buffer in 'new sample':

sample = appsink.emit("pull-sample")
buffer = sample.get_buffer()

But what should I do to get data from buffer? I used buffer.map,but
invalid(I am in python). And can buf.extract() get data?if so ,how to do for
the parameters? is that right?:

p = create_string_buffer(buffer_size)
buffer_size = buffer.get_size()
buffer.extract(0,addressof(p),buffer_size)

HELP! HELP! HELP!



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