Get length of wav file in samples with python

Question

i am trying to run a python code that processes wav files. It asks to give length of file in samples. After research i found this command

>>>import os

>>>b=os.path.getsize('/somepath')

>>>b       

but i am not sure if it gives result in samples.

Anyone can help?

Answer 1

If you are using scipy you can get the length in seconds using scipy.io

import scipy.io.wavfile as wav

file_path = "/path/to/yourfile.wav"
(source_rate, source_sig) = wav.read(file_path)
duration_seconds = len(source_sig) / float(source_rate)

If you are using pydub you can simply read the audio segment and get duration.

from pydub import AudioSegment
audio = AudioSegment.from_file(file_path)
print(audio.duration_seconds)

Answer 2

os.path.getsize will get the size of files in bytes.

>>> import os
>>> b = os.path.getsize('C:\\Users\\Me\\Desktop\\negley.wav')
>>> b
31449644 #This is in bytes, in megabytes it would be 31.45 Megabytes (which is accurate)

Want to get the size in megabytes?

>>> b = int(os.path.getsize('C:\\Users\\Will\\Desktop\\negley.wav')) / 1024 / 1024
>>> b
29.992717742919922 #Close enough?

Or to get the length in seconds, you can use Achilles method of:

import wave
import contextlib
audiofile = 'C:\\Users\\Will\\Desktop\\negley.wav'
with contextlib.closing(wave.open(audiofile,'r')) as f: 
  frames = f.getnframes()
  rate = f.getframerate()
  length = frames / float(rate)    
  print(length)

Answer 3

The length of an audio or wave file is determined by it's framerate.To get the length try this:

import wave
import contextlib
audiofile = '/pathto/your.wav' 
with contextlib.closing(wave.open(audiofile,'r')) as f: 
  frames = f.getnframes()
  rate = f.getframerate()
  length = frames / float(rate)    
  print(length)

Answer 4

You can simply use the scipy library. Try this:

from scipy.io.wavfile import read
audiofile = '/path/to/file.wav'
sample_rate_in_s, data = read(audiofile)
print(len(data))