I have written below code to save spectrograms of uploaded wav file to a specific folder say '/static/images/spectrograms' however, I am getting OSError: [Errno 30] Read-only file system: '/static'. Could someone please suggest how can this be rectified?
def saveMel2(y, directory): N_FFT = 1024 # Number of frequency bins for Fast Fourier Transform HOP_SIZE = 1024 # Number of audio frames between STFT columns SR = 44100 # Sampling frequency N_MELS = 30 # Mel band parameters WIN_SIZE = 1024 # number of samples in each STFT window WINDOW_TYPE = 'hann' # the windowin function FEATURE = 'mel' # feature representation spectral_centroids = librosa.feature.spectral_centroid(y=y, sr=sr)[0] frames = range(len(spectral_centroids)) t = librosa.frames_to_time(frames) plt.rcParams['figure.figsize'] = (10,2) fig = plt.figure(1,frameon=False) DPI = 72 fig.set_size_inches(224/float(DPI),224/float(DPI)) ax = plt.Axes(fig, [0., 0., 1., 1.]) ax.set_axis_off() fig.add_axes(ax) ax1 = plt.subplot(2, 1, 1) spectogram = librosa.display.specshow( librosa.core.amplitude_to_db( librosa.feature.melspectrogram( y=y, sr=SR)),x_axis='time', y_axis='mel') plt.subplot(2, 1, 2, sharex=ax1) librosa.display.waveplot(y=y, sr=sr, alpha=0.4) plt.plot(t, normalize(spectral_centroids), color='r') fig.savefig(directory) fig.clear() ax.cla() plt.clf() plt.close('all')
def create_spectrogram(file): size = {'desired': 10, # [seconds] 'minimum': 5, # [seconds] 'stride' : 0, # [seconds] 'name': 5 } directory= '/static/images/spectrograms' step=1 if step>0: for birdnr,path in enumerate(file): if not os.path.exists(directory): os.makedirs(directory) if not os.path.exists(directory+path.rsplit('/',1)[1].replace(' ', '')[:-4]+"1_1.png"): y, sr = librosa.load(path,mono=True) y = no.reduce_noise(y, sr) step = (size['desired']-size['stride'])*sr nr=0 for start, end in zip(range(0,len(y),step),range(size['desired']*sr,len(y),step)): nr=nr+1 if end-start > size['minimum']*sr: melpath=path.rsplit('/',1)[1] melpath=path+melpath.replace(' ', '')[:-4]+str(nr)+"_"+str(nr)+".png" saveMel2(y[start:end],melpath) else: print("Error: Stride should be lower than desired length.")
