1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
#!/usr/bin/env python
# -*- Mode: Python -*-
# vi:si:et:sw=4:sts=4:ts=4
# audio-controller.py
# (c) 2005 Edward Hervey <edward at fluendo dot com>
# Test case for the GstController on sinesrc -> alsasink
# Inspired from ensonic's examples/controller/audio-controller.c
import pygst
pygst.require('0.10')
import gst
import time
def main():
pipeline = gst.Pipeline("audiocontroller")
src = gst.element_factory_make("audiotestsrc", "src")
sink = gst.element_factory_make("alsasink", "sink")
pipeline.add(src, sink)
src.link(sink)
control = gst.Controller(src, "freq", "volume")
control.set_interpolation_mode("volume", gst.INTERPOLATE_LINEAR)
control.set_interpolation_mode("freq", gst.INTERPOLATE_LINEAR)
control.set("volume", 0, 0.0)
control.set("volume", 2 * gst.SECOND, 1.0)
control.set("volume", 4 * gst.SECOND, 0.0)
control.set("volume", 6 * gst.SECOND, 1.0)
control.set("freq", 0, 440.0)
control.set("freq", 3 * gst.SECOND, 3000.0)
control.set("freq", 6 * gst.SECOND, 880.0)
pipeline.set_state(gst.STATE_PLAYING)
time.sleep(7)
if __name__ == "__main__":
main()
|
