I get this error : [Errno 21] Is a directory:

Question

# Save directory path in 'path'
path = r'---path '

# Declare a dummy Numpy array (row vector)
result_array = np.empty([1,54])

# Create a list of audio file names 'file_list'
file_list = os.listdir(path)

i=0

for filename in file_list:
    
    # Read WAV file. 'rosa.core.load' returns sampling frequency in 'fs' and audio signal in 'sig'
    sig, fs = rosa.core.load(path + '\\' + file_list[i], sr=None)
    
    # Calculate the average mfcc (utterance-level features) using 'rosa.feat.mfcc()' and 'np.mean' method. '.T' transposes the rows and columns. 'axis=0' indicates average is calculated column-wise
    avg_mfcc_feat = np.mean(rosa.feature.mfcc(y=sig, sr=fs, n_mfcc=26).T,axis=0)
    
    # Calculate the standard deviation of mfcc (utterance-level features) using 'rosa.feat.mfcc()' and 'np.std' method. '.T' transposes the rows and columns. 'axis=0' indicates average is calculated column-wise
    std_mfcc_feat = np.std(rosa.feature.mfcc(y=sig, sr=fs, n_mfcc=26).T,axis=0)
    
    # Calculate the average zero crossing rate (utterance-level feature) using 'rosa.feat.zero_crossing_rate()' and 'np.mean' method. '.T' transposes the rows and columns. 'axis=0' indicates average is calculated column-wise
    zcross_feat = rosa.feature.zero_crossing_rate(sig)
    avg_zcross_feat = np.mean(rosa.feature.zero_crossing_rate(y=sig).T,axis=0)
    
    # Append the three 1D arrays into a single 1D array called 'feat'.
    feat0 = np.append(avg_mfcc_feat, std_mfcc_feat, axis=0)
    
    feat1 = np.append(feat0, avg_zcross_feat, axis=0)
    
    # Save emotion label from file name. 'path' contains directory's address, 'file_list' contains file name, and '\\' joins the two to form file's address
    label = os.path.splitext(os.path.basename(path + '\\' + file_list[i]))[0].split('-')[2]
    
    # Create a new Numpy array 'sample' to store features along with label
    sample = np.insert(feat1, obj=53, values=label)
    
    result_array = np.append(result_array, sample)
    
    i+=1

# Print out the 1D Numpy array
result_array

I'm getting this error while trying to read the contents and loop over the subdirectories of Ravdess dataset. Can someone tell me what am I doing wrong? Any help is deeply appreciated. Thanks!

Answer 1

1. os.listdir() lists the entries of a directory, which are the files and directories it contains. If you want to recursively include all files and folders under path , then use os.walk() .

To use only files from os.listdir() , then add a check with os.path.isfile() :

Return True if path is an existing regular file. This follows symbolic links, so both islink() and isfile() can be true for the same path.

for filename in file_list:
    if not os.path.isfile(os.path.join(path, filename)):
        # not a file, skip it
        continue
    # rest of your code here
    sig, fs = rosa.core.load(...)
    ...

2. Inside the for -loop, you've got two cases where you've put path + '\\' + file_list[i] - this should be just path + '\\' + filename , or better os.path.join(path, filename) .

• if you want indexes with the filename iteration, do for i, filename in enumerate(file_list): instead of manually incrementing i .
• and instead of repeating os.path.join(path, filename) multiple times, put it in a variable at the start of your loop:

   for filename in file_list: filepath = os.path.join(path, filename) if not os.path.isfile(filepath): continue sig, fs = rosa.core.load(filepath, sr=None)...