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sliceSpectrogram.py

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# Import Pillow:

from PIL import Image

import os.path

from config import spectrogramsPath, slicesPath

#Slices all spectrograms

def createSlicesFromSpectrograms(desiredSize):

for filename in os.listdir(spectrogramsPath):

if filename.endswith(".png"):

sliceSpectrogram(filename,desiredSize)

#Creates slices from spectrogram

#TODO Improvement - Make sure we don't miss the end of the song

def sliceSpectrogram(filename, desiredSize):

genre = filename.split("_")[0] #Ex. Dubstep_19.png

# Load the full spectrogram

img = Image.open(spectrogramsPath+filename)

#Compute approximate number of 128x128 samples

width, height = img.size

nbSamples = int(width/desiredSize)

width - desiredSize

#Create path if not existing

slicePath = slicesPath+"{}/".format(genre);

if not os.path.exists(os.path.dirname(slicePath)):

try:

os.makedirs(os.path.dirname(slicePath))

except OSError as exc: # Guard against race condition

if exc.errno != errno.EEXIST:

raise

#For each sample

for i in range(nbSamples):

print "Creating slice: ", (i+1), "/", nbSamples, "for", filename

#Extract and save 128x128 sample

startPixel = i*desiredSize

imgTmp = img.crop((startPixel, 1, startPixel + desiredSize, desiredSize + 1))

imgTmp.save(slicesPath+"{}/{}_{}.png".format(genre,filename[:-4],i))