from pydub import AudioSegment
from scipy import signal
from operator import itemgetter
import pyaudio
import numpy as np
import utils
import os
import sys
import warnings
import operator
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt
FORMAT = pyaudio.paInt16
'''
Number of audio channels in the recording
'''
CHANNELS = 2
'''
Original sample rate of the recordings
'''
SAMPLE_RATE = 44100
'''
Sampling rate (after downsampling)
'''
FS = 8000
'''
Factor by which the original signal will be downsampled
'''
DECIMATION_FACTOR = SAMPLE_RATE/FS
'''
Size of the FFT window, affects frequency granularity (we saw this in class!)
'''
WINDOW_SIZE = 1024
'''
Degree to which a fingerprint can be paired with its neighbors --
higher will cause more fingerprints, but potentially better accuracy.
'''
FAN_VALUE = 15
'''
Ratio by which each window overlaps the previous and next window --
higher will cause more fingerprints, but higher granularity of offset matching
'''
OVERLAP_RATIO = 0.5
'''
Maximum time difference between a pair of frequencies
'''
MAX_PAIR = 150
path = os.getcwd()
warnings.filterwarnings("ignore", message="divide by zero encountered in log10")
warnings.filterwarnings("ignore", category=DeprecationWarning)
# Database with key=songname, value=[channel1, channel2]
SongDb = {}
#Goes through mp3s folder and adds each song to database
for filename in os.listdir(path + "/mp3s/"):
audiofile = AudioSegment.from_file(path + "/mp3s/" + filename)
data = np.fromstring(audiofile._data, np.int16)
channels = []
for chn in range(audiofile.channels):
channels.append(data[chn::audiofile.channels])
SongDb[filename[:-3]] = channels
print("Added to song database: " + str(filename[:-4]))
def Preprocess(channels):
channel1 = channels[0]
channel2 = channels[1]
channelmean = ((channel1 + channel2)/2 - np.mean(channel1 + channel2))
resampled = signal.decimate(channelmean, int(DECIMATION_FACTOR))
return resampled
# Database with key=songname, value=processed signal
ProcessedDb = {}
#Processes each song and adds it to ProcessedDb
#Prints table of number of samples in for each song
print('{0:65}{1:22}{2:20}\n'.format('Song Name', 'Original #Samples', 'Processed #Samples'))
for song, sig in SongDb.items():
processed = Preprocess(sig)
ProcessedDb[song] = processed
original_duration = len(sig[0])
processed_duration = len(processed)
print('{0:50}{1:32d}{2:20d}'.format(song, original_duration, processed_duration))
def getSpectrogram(signal):
# Initialize magnitudes array
magnitudes = []
magnitudes, freqs, t = mlab.specgram(signal, NFFT=WINDOW_SIZE, Fs=FS, noverlap=OVERLAP_RATIO*WINDOW_SIZE)
for i in range(len(magnitudes)):
# Find log of magnitudes
magnitudes[i] = 10 * np.log10(np.abs(magnitudes[i]))
# Return any infinites as zero
magnitudes[np.nonzero((magnitudes == np.inf) | (magnitudes == -np.inf))] = 0
return magnitudes
''' TODO '''
# Database with key=songname, value=spectrogram
Spectrograms = {}
# Gets the spectrogram for each song and adds it to the Spectrograms database
for song, sig in ProcessedDb.items():
spec_mag = getSpectrogram(sig)
Spectrograms[song] = spec_mag
# Plots each spectrogram
for song, spec in Spectrograms.items():
plt.title(song)
plt.imshow(spec)
plt.show()
''' TODO '''
# Database with key=songname, value=array of local peaks
Peaks = {}
# Gets the local peaks for each song and adds it to the Peaks database
for song, spec in Spectrograms.items():
a, b, spec_peaks = utils.get_2D_peaks(spec)
Peaks[song] = list(spec_peaks)
plt.title(song)
plt.imshow(spec)
plt.plot(b, a, '.', markersize=1)
plt.show()
''' TODO '''
#FAN_VALUE
def getPairs(peaks):
peaks = list(peaks)
pairs = []
counter = np.zeros(len(peaks))
for i in range(len(peaks)):
for j in range(len(peaks)):
if (np.abs(peaks[i][1] - peaks[i][1]) <= MAX_PAIR) and (i != j):
if (counter[i] < FAN_VALUE) and (counter[j] < FAN_VALUE):
pairs.append((peaks[i][0], peaks[j][0], np.abs(peaks[i][1] - peaks[j][1])))
counter[i] += 1
counter[j] += 1
return pairs # a list of 3x1 arrays(f1, f2, tdelta)
''' TODO '''
# Database with key=fingerprint (f1, f2, tdelta), value=songname
LookUpTable = {}
# Get fingerprints for each song stores them in the LookUpTable database
for song, peak in Peaks.items():
pairs = getPairs(peak)
for pair in pairs:
LookUpTable[tuple(pair)] = song
# Prints a sample of the LookUpTable entries
items = list(LookUpTable.items())
items = items[:][:3]
print(str(items))
# Database with key=songname, value=[channel1, channel2] for a snippet of the song
TestDb = {}
# Goes through test_mp3s folder and adds a snippet of each song to database
for filename in os.listdir("./test_mp3s/"):
audiofile = AudioSegment.from_file("./test_mp3s/" + filename)
data = np.fromstring(audiofile._data, np.int16)[SAMPLE_RATE*60:SAMPLE_RATE*75]
channels = []
for chn in range(audiofile.channels):
channels.append(data[chn::audiofile.channels])
TestDb[filename] = channels
print("Added to test database. : " + str(filename))
# Goes through test snippets and runs same fingerprinting process
# Prints out the number of matches for each song and confidence of prediction
for test in TestDb.keys():
print('\033[1mTesting: ' + test + '\033[0m \n')
Matches = {}
for song in SongDb.keys():
Matches[song] = 0
channels = TestDb[test]
preprocessed = Preprocess(channels)
spectrogram = getSpectrogram(preprocessed)
_, _, peaks = utils.get_2D_peaks(spectrogram)
pairs = getPairs(peaks)
for p in pairs:
match = LookUpTable.get(p, None)
if match:
Matches[match] += 1
prediction, count = max(Matches.items(), key=itemgetter(1))
for k,v in Matches.items():
if k == prediction:
print('\033[1m{0:50} ==> {1:10d} \033[0m'.format(k, v))
else:
print('{0:50} ==> {1:10d}'.format(k, v))
confidence = str(float(count)/sum(Matches.values())*100)[:5] + "%"
prediction = max(Matches.items(), key=itemgetter(1))
print(f'\nPrediction: {prediction[0]}')
print('\033[1m{0:10}: {1:10}\033[0m\n-----------------------------------------------------------------------\n\n'.format('Confidence', confidence))