I would like to detect silence from an icecast radio stream, i have attempted the following code, however when i silence the stream the rms value stays the same where i would expect a close to zero value: any help
Code:
from urllib import urlopen
import audioop, numpy as np
url = "http://localhost:8382/listen.mp3"
u = urlopen(url)
data = u.read(8192)
while data:
data = u.read(8192)
#rms = audioop.rms(data, 2)
d = np.frombuffer(data, np.int16)
numpy_rms = np.sqrt(sum(d*d)/len(d))
print numpy_rms, audioop.rms(data, 2)
#print rms
print (min(d), max(d)), audioop.minmax(data,2)
alternate to analysing live stream, but not preferred option: i have considered saving a 10 second mp3 files from the stream but not i am not sure how to analyse MP3. se code below
Code:
#! /usr/bin/env python
import argparse
from icerec.stream_writer import StreamWriter
from pprint import pprint
parser = argparse.ArgumentParser(description='Tool that will record a icecast stream.')
parser.add_argument('url', help="Icecast stream URL")
parser.add_argument('length', type=int, help="Length of time to record stream (in seconds)")
parser.add_argument('-d', '--destination', default="./",
help="File destination. Defaults to current directory")
parser.add_argument('-f', '--filename', default="output.mp3", help="File name of saved stream")
args = parser.parse_args()
s = StreamWriter( args.url, args.length, destination=args.destination, filename=args.filename)
s.record()
pprint(s.metadata)
I come up with this solution.
#! /usr/bin/env python
from icerec.stream_writer import StreamWriter
from pprint import pprint
import array
import httplib,urllib
from pydub.utils import get_array_type
from pydub.playback import play
from pydub.utils import mediainfo
from pydub import AudioSegment
from pydub.silence import split_on_silence
import numpy as np
import audioop
poURL = 'api.pushover.net:443'
apikey = 'xxxxxxxxxxxxxx'
#pushover_alert################################################################
def Notify(poApiKey, poUserKey, poTitle, poMessage, poPriority,poSound):
conn = httplib.HTTPSConnection(poURL)
conn.request('POST', '/1/messages',
urllib.urlencode({
'token': poApiKey,
'user': poUserKey,
'token': poApiKey,
'user': poUserKey,
'title': poTitle,
'message': poMessage,
'priority': poPriority,
'sound': poSound,
}), { 'Content-type': 'application/x-www-form-urlencoded' })
while True:
try:
s = StreamWriter( "http://localhost:8382/listen.mp3", 0.5, destination="/var/www/html/", filename="output.mp3")
s.record()
#pprint(s.metadata)
sound = AudioSegment.from_mp3("/var/www/html/output.mp3")
bit_depth = sound.sample_width * 8
array_type = get_array_type(bit_depth)
numeric_array = array.array(array_type, sound._data)
info = mediainfo("/var/www/html/output.mp3")
#print numeric_array
if sound.rms <10:
i += 1
else:
i = 0
if i == 5:
mesg = 'Qkradio Stream Silence Detected for more than 5seconds'
print 'alert sent', mesg
Notify('xxxxxxxxxxxx','xxxxxxxxxxxxx','Aquarium controller',mesg,0,'siren')
print i ,"\tfile rms:", sound.rms,"\tfile loudness:", sound.dBFS, "\tPeak Amplitude:", sound.max,"\tlength:", len(sound),"\tSample rate:" ,info['sample_rate']
except:
print "error"
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