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sliceSpectrogram.py
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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))