Spectrum.py - Revision history

Michael Murtaugh: /* Visualizing the data with PyGame */

2009-06-01T11:10:41Z

Visualizing the data with PyGame

← Older revision		Revision as of 13:10, 1 June 2009
Line 49:		Line 49:
	Pipe the level data into a [[PyGame]] script, that uses [[RelativeValue.py]] to filter and display the data.		Pipe the level data into a [[PyGame]] script, that uses [[RelativeValue.py]] to filter and display the data.

	~~Running~~ the ~~show~~...		To run, we pipe the data from the above into the below, using "unbuffered" python...
	<source lang="bash">		<source lang="bash">
	python -u spectrum.py \| python -u spectrum_display.py		python -u spectrum.py \| python -u spectrum_display.py

Michael Murtaugh: /* Displaying with PyGame */

2009-06-01T11:10:05Z

Displaying with PyGame

← Older revision		Revision as of 13:10, 1 June 2009
Line 45:		Line 45:
	</source>		</source>

	== ~~Displaying~~ with [[PyGame]] ==		== Visualizing the data with PyGame ==

	Pipe the level data into a [[PyGame]] script, that uses [[RelativeValue.py]] to filter and display the data.		Pipe the level data into a [[PyGame]] script, that uses [[RelativeValue.py]] to filter and display the data.

Michael Murtaugh at 11:08, 1 June 2009

2009-06-01T11:08:08Z

@@ Line 43: / Line 43: @@
 loop = gobject.MainLoop()
 loop.run()
 </source>

Michael Murtaugh at 11:06, 1 June 2009

2009-06-01T11:06:02Z

← Older revision		Revision as of 13:06, 1 June 2009
Line 1:		Line 1:
	[[~~Media~~:Spectrum.zip]]		[[Image:Spectrum.zip]]

	== Getting the data from gstreamer ==		== Getting the data from gstreamer ==

Michael Murtaugh: /* Command line level analyzer */

2009-06-01T10:43:08Z

Command line level analyzer

← Older revision		Revision as of 12:43, 1 June 2009
Line 1:		Line 1:
	[[Media:Spectrum.zip]]		[[Media:Spectrum.zip]]

	== ~~Command line level analyzer~~ ==		== Getting the data from gstreamer ==

	<source lang="python">		<source lang="python">

Michael Murtaugh at 10:41, 1 June 2009

2009-06-01T10:41:56Z

← Older revision		Revision as of 12:41, 1 June 2009
Line 1:		Line 1:
	[[Media:Spectrum.zip]]		[[Media:Spectrum.zip]]

			== Command line level analyzer ==

	<source lang="python">		<source lang="python">

Michael Murtaugh: New page: Media:Spectrum.zip import pygst pygst.require("0.10") import gst, gobject import time, thread class Spectrum: def init(self): # Create a gstreamer pipe...

2009-06-01T10:40:37Z

New page: Media:Spectrum.zip <source lang="python"> import pygst pygst.require("0.10") import gst, gobject import time, thread class Spectrum: def __init__(self): # Create a gstreamer pipe...

New page

[[Media:Spectrum.zip]]

<source lang="python">
import pygst
pygst.require("0.10")
import gst, gobject
import time, thread

class Spectrum:

def __init__(self):
# Create a gstreamer pipeline, listen to it's messages via on_message callback
# listener_desc = 'alsasrc ! spectrum ! fakesink'
listener_desc = 'alsasrc ! spectrum bands=64 ! fakesink'
self.listener = gst.parse_launch(listener_desc)
bus = self.listener.get_bus()
bus.add_signal_watch()
bus.connect("message", self.on_message)

def on_message (self, bus, message):
""" callback function for gstreamer messages """
s = message.structure
# print "message.name", s.get_name()
# print "message.structure.keys", s.keys()
if s and s.get_name() == "spectrum":
# spectrum messages have 'endtime', 'timestamp', 'stream-time', 'running-time', 'duration', 'magnitude'
# print len(s['magnitude'])
print "data: " + " ".join([str(x) for x in s['magnitude']])
return True

def start(self):
self.listener.set_state(gst.STATE_PLAYING)
while True:
time.sleep(1)

# Run the Spectrum object in it's own thread, then start the gobject.MainLoop as required
spectrum = Spectrum()
thread.start_new_thread(spectrum.start, ())
gobject.threads_init()
loop = gobject.MainLoop()
loop.run()
</source>