Python 2.7.3 (default, Sep 26 2013, 16:35:25) [GCC 4.7.2] on linux2 Linux Mint 14
Using Python, I am reading a wav and putting the data to a text file. The entire script is below. It is my first Python Script.
The values for the micsec can be anything from 000000 to 999999. There are frequently leading zero's which I am stripping with lstrip('0').
If the value is 000000, I end up with null. I'm using an extra step to change null to 0.
What is the best way to do this in a single step ?
Thanks for any input.
!/usr/bin/python
import contextlib, datetime, math, os, time, wave, glob
from scipy.io.wavfile import read
from numpy import log10, sqrt, mean
import numpy as np
path = "/the/path/*.wav"
for fname in glob.glob(path):
print "process_wav is processing - " + fname
outfname = fname + ".txt"
mtime = datetime.datetime.fromtimestamp(os.path.getmtime(fname))
tm=0.000000
with contextlib.closing(wave.open(fname,'r')) as f:
channels = f.getnchannels()
sampwidth = f.getsampwidth()
comptype = f.getcomptype()
frames = f.getnframes()
rate = f.getframerate()
wav_duration = frames / float(rate)
frame_duration = round((wav_duration / frames),6)
samprate, wavdata = read(fname)
chunks = np.array_split(wavdata, frames)
hdr = (
"# audio file processed - " + fname +
"\n# this file name - " + outfname +
"\n# audio file mod time-" + str(mtime) +
"\n# channels - " + str(channels) +
"\n# sampwidth - " + str(sampwidth) +
"\n# comptype - " + str(comptype) +
"\n# frames - " + str(frames) +
"\n# rate - " + str(rate) +
"\n# wav_duration - " + str(wav_duration) +
"\n# frame_dutation - " + "{0:0.6f}".format(frame_duration) +
"\n# chunk|wave_file_name|audio_file_timestamp|chunk_second|chunk_microsecond|chunk_time_in_audio|frame_duration|dB\r\n"
)
out = open(outfname,'w')
out.write(hdr)
for i,chunk in enumerate(chunks):
try:
sec = int("{0:0.6f}".format(round(float(tm),6)).split('.')[0])
micsec = "{0:0.6f}".format(round(float(tm),6)).split('.')[1].lstrip('0')
#handle 000000 - there has to be a better way
micsec = int(float(micsec)) if len(micsec)>=1 else 0
cm = mtime + datetime.timedelta(seconds=sec,microseconds=micsec)
out.write("{}|{}|{}|{}|{}|{}|{}|{}\n".format(i, fname, mtime, sec, micsec, cm, frame_duration, 20*log10( sqrt(mean(chunk**2)))))
tm += frame_duration
except ValueError as ex:
print("value error" + str(ex))
out.write(str(i) + str(ex))
except Exception,e:
print("ERROR" + str(e))
out.write(str(i) + str(e))
out.close()
