Gstspectrum: Difference between revisions
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== usage == | |||
<pre> | |||
usage: gstspectrum [-h] [--freq FREQ] [--interval INTERVAL] [--bands BANDS] | |||
path | |||
Dumps spectral analysis of audio using gstreamer | |||
positional arguments: | |||
path audio filename to analyze (wav format only) | |||
optional arguments: | |||
-h, --help show this help message and exit | |||
--freq FREQ audio frequency | |||
--interval INTERVAL interval duration (in seconds) | |||
--bands BANDS number of bands to split the spectrum | |||
</pre> | |||
== source == | |||
<source lang="python"> | <source lang="python"> | ||
#!/usr/bin/env python | #!/usr/bin/env python | ||
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</source> | </source> | ||
[[Category:Cookbook]][[Category:Gstreamer]][[Category:Python]][[Category:Audio]][[Category:Fourier]] |
Revision as of 09:51, 4 March 2013
usage
usage: gstspectrum [-h] [--freq FREQ] [--interval INTERVAL] [--bands BANDS] path Dumps spectral analysis of audio using gstreamer positional arguments: path audio filename to analyze (wav format only) optional arguments: -h, --help show this help message and exit --freq FREQ audio frequency --interval INTERVAL interval duration (in seconds) --bands BANDS number of bands to split the spectrum
source
#!/usr/bin/env python
#-*- coding:utf-8 -*-
import gst, pygst, struct, sys, argparse
parser = argparse.ArgumentParser(description="Dumps spectral analysis of audio using gstreamer")
parser.add_argument('--freq', default=44100, type=int, help="audio frequency")
parser.add_argument('--interval', default=0.1, type=float, help="interval duration (in seconds)")
parser.add_argument('--bands', default=128, type=int, help="number of bands to split the spectrum")
parser.add_argument('path', help="audio filename to analyze (wav format only)")
args = parser.parse_args()
inpath = args.path
AUDIOFREQ = args.freq # MAX FREQ OF ANALYSIS
INTERVAL_SECS = args.interval
INTERVAL = int(INTERVAL_SECS * 10**9) # DURATION OF "FRAMES" in nanoseconds / audio chunks to process
BANDS = args.bands # 128 # SPLIT THE SPECTRUM UP INTO THIS MANY BANDS
NANOS = float(10**9)
GST_MESSAGE_EOS = (1 << 0) # couldn't find this in gst package (wtf!)
# alternative pipeline for live analysis
# listener_desc = 'autoaudiosrc ! spectrum interval={1} bands={2} ! fakesink'
listener_desc = 'filesrc location="{0}" ! wavparse ! spectrum interval={1} bands={2} ! fakesink'
listener_desc = listener_desc.format(inpath, INTERVAL, BANDS)
# (pmin, pmax) = (None, None)
def listener_on_message (bus, message, data):
global pmin, pmax
s = message.structure
if s:
msgname = s.get_name()
if msgname == "spectrum":
secs = s['timestamp'] / NANOS
print ("%0.1f-%0.1f\t"%(secs, secs + INTERVAL_SECS)) + ("\t".join([str(x) for x in s['magnitude']]))
else:
# print dir(message), message, message.type
if message.type & GST_MESSAGE_EOS:
listener.set_state(gst.STATE_NULL)
sys.exit(0)
return True
freqs = []
for i in range(BANDS):
freqs.append( ((AUDIOFREQ / 2.0) * i + AUDIOFREQ / 4.0) / BANDS )
# SIMPLE HEADERS
#print "time\t", "\t".join([str(x) for x in freqs])
# RANGE HEADERS
labels = []
for i in range(BANDS):
if i == 0:
fromfreq = 0.0
else:
fromfreq = freqs[i-1]
labels.append("%0.1f-%0.1f" % (fromfreq, freqs[i]))
print "time\t", "\t".join(labels)
listener = gst.parse_launch(listener_desc)
listener.get_bus().add_watch(listener_on_message, None)
import gobject
mainloop = gobject.MainLoop()
listener.set_state(gst.STATE_PLAYING)
try:
mainloop.run()
except: # an interruption from Ctrl-C
pass