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wave_reader.py
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wave_reader.py
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import math
import numpy
import scipy.io.wavfile as wavfile
from scipy import signal
import analyzer
import build_data
import sys
import wave_gen
def stereoToMono(audiodata):
if len(audiodata.shape) < 2:
return audiodata
d = audiodata.sum(axis=1) / 2
return d
def readWav(filename):
rate, data = wavfile.read(filename)
return rate, data
def extractFeatures(track, div):
rate, data = wavfile.read(track + '.wav')
if data.ndim > 1:
data = stereoToMono(data)
matrix = numpy.array([])
vmatrix = numpy.array([])
segSize = rate / div
start = 0
end = segSize
for i in range(0, data.size / segSize):
data_seg = data[start:end]
start += segSize
end += segSize
features = analyzer.getFrequencies(data_seg)[0:5000]
matrix = build_data.addToFeatureMatrix(matrix, features)
vmatrix = build_data.addToFeatureMatrix(vmatrix,
numpy.array([numpy.argmax(features)]))
build_data.saveFile(track + '_seg.csv', matrix)
build_data.saveFile(track + '_volume.csv', vmatrix)
def wavToFeatures(filename):
rate, data = wavfile.read(filename)
if data.ndim > 1:
data = stereoToMono(data)
segDiv = 4 #1/10 of a second
segSize = rate / segDiv
start = 0
end = segSize
matrix = numpy.array([])
for i in range(0, data.size / segSize):
data_seg = data[start:end]
start += segSize
end += segSize
features = analyzer.getFrequencies(data_seg)
matrix = build_data.addToFeatureMatrix(matrix, features[0:2000])
# build_data.saveFile('testdata.csv', matrix)
return matrix
if __name__ == '__main__':
track = sys.argv[1]
div = 10
extractFeatures(track, div)
## matrix = numpy.genfromtxt(track + '_seg.csv', delimiter=',')
## wave_gen.writeWav(track + '_seg.wav', matrix, div)
## vmatrix = numpy.genfromtxt(track + '_volume.csv', delimiter=',')
## wave_gen.writeWav(track + '_volume.wav', vmatrix, div)