Thursday, November 5, 2015

Audio Slicing in python

Divide the audio file into no of sample by time interval and then play.

 import wave  
import pygame
import time
import sys
def slice(infile, outfilename, start_ms, end_ms):
width = infile.getsampwidth() #Returns sample width in bytes
rate = infile.getframerate() #Returns sampling frequency
fpms = rate / 1000 # frames per ms
length = (end_ms - start_ms) * fpms
start_index = start_ms * fpms
out =, "w")
out.setparams((infile.getnchannels(), width, rate, length, infile.getcomptype(), infile.getcompname()))
infile.rewind() #Rewind the file pointer to the beginning of the audio stream
anchor = infile.tell() #Return current file pointer position
infile.setpos(anchor + start_index) #Set the file pointer to the specified position
out.writeframes(infile.readframes(length)) #Write audio frames and make sure nframes is correct
if __name__ == "__main__":
slice("song1.wav", "r"), "out.wav", int(sys.argv[1]), int(sys.argv[2]))
while == True:

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