diff --git a/src/tadam.py b/src/tadam.py
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+++ b/src/tadam.py
@@ -0,0 +1,145 @@
+#!/usr/bin/python3
+"""
+Tadam !
+
+Tool to preprocess audio in real time from folder coming from recorder SD card 
+into time expansion audio splitted in 5s-long chunks to be sent to Vigie-Chiro.
+"""
+
+__author__ = "Samuel ORTION"
+__copyright__ = "Copyright 2021, Chiro-Canto organisation"
+__credits__ = ["Samuel ORTION"]
+
+__license__ = "GPL"
+__version__ = "1.0.0"
+__maintainer__ = "Samuel ORTION"
+__email__ = "samuel.ortion@orange.fr"
+__status__ = "Production"
+__date__ = "2021-05-17"
+
+import soundfile as sf
+import os
+import sys
+import numpy as np
+import getopt
+import zipfile
+
+verbose = False
+chunk_length = -1
+
+def usage():
+    usage_str = """
+        
+        Tadam !
+
+        Tool to preprocess audio in real time from folder coming from recorder SD card 
+        into time expansion audio splitted in 5s-long chunks to be sent to Vigie-Chiro.        
+
+
+        Author: Samuel ORTION
+        License: GNU GPL v3 or later
+
+        Requirements:
+            pysoundfile
+        
+        Usage:
+            ./tadam.py -i INPUT_FOLDER [ -o OUTPUT_FOLDER ]
+
+        Available options:
+            -v (--verbose) - Verbose mode
+            -h (--help) - Display usage
+            -i (--input) - Specify input folder
+            -o (--output) - Specify output folder
+            -l (--length) - Specify the max length (in seconds) of output wav
+            -z (--zip) - Specify wether the output folder has to be compressed
+            -p (--prefix) - Specify the prefix that will be added to the output file name
+            -r (--ratio) - Specify samplerate convertion rate
+
+        Example:
+            tadam -v -i raw -o exp -l 5 -z -p "Car910130-2021-Pass0-Z1-AudioMoth-247AA5015FDF286B-" -r 0.1 
+    """
+    print(usage_str)
+
+def rate(infile, outfile, rate_ratio):
+    data, samplerate = sf.read(infile)
+    new_samplerate = int(samplerate * rate_ratio)
+    if (chunk_length != -1):
+        if verbose:
+            print(f"\t Splitting {infile} in {chunk_length}s-long chunks.")
+        sections = int(np.ceil(len(data) / samplerate / chunk_length))
+        for i in range(sections):
+            if verbose:
+                print(f"\t {str(i).zfill(len(str(sections)))}/{sections} \t {outfile}")
+            filename = outfile.replace('.wav', f'-{str(i).zfill(len(str(sections)))}.wav')
+            temp = data[i*samplerate*chunk_length : i*samplerate*chunk_length+samplerate*chunk_length]
+            sf.write(filename, temp, samplerate)
+    else:    
+        sf.write(outfile, data, new_samplerate)
+
+def convert_folder(infolder, outfolder, rate_ratio, prefix):
+    try:
+        os.mkdir(outfolder)
+    except:
+        print(f"output folder {outfolder} exists.")
+    infiles = os.listdir(infolder)
+    n = len(infiles)
+    i = 1
+    for infile in infiles:
+        outfile = prefix + infile.replace('.WAV', '.wav').replace('.wav', f'.exp_x{int(1/rate_ratio)}.wav')
+        if verbose:
+            print(f"{str(i).zfill(len(str(n)))}/{n}     Processing {infile} → {outfile}...")
+        rate(os.path.join(infolder, infile), os.path.join(outfolder, outfile), rate_ratio)
+
+def zip_folder(outfolder):
+    if verbose:
+        print("Compressing .zip archive...")
+    with zipfile.ZipFile(f"{outfolder}.zip", 'w') as f:
+        for file in os.listdir(outfolder):
+            f.write(os.path.join(outfolder, file))
+    if verbose:
+        print("Archive compressed.")
+
+def main():
+    try:
+        opts, args = getopt.getopt(sys.argv[1:], "hi:o:vr:l:zp:", ["help", "input=", "output=", "verbose", "ratio=", "length=", "zip", "prefix="])
+    except getopt.GetoptError as err:
+        print(err)
+    
+    global verbose
+    verbose  = False
+    rate_ratio = 0.1 # Default is x10 time expansion
+    infolder = "raw"
+    outfolder = "exp"
+    compress = False
+    prefix = ""
+
+    for o, a in opts:
+        if o in ("-v", "--verbose"):
+            verbose = True
+        elif o in ("-h", "--help"):
+            usage()
+            sys.exit()
+        elif o in ("-i", "--input"):
+            infolder = a
+        elif o in ("-o", "--output"):
+            outfolder = a
+        elif o in ("-r", "--ratio"):
+            rate_ratio = float(a)
+        elif o in ("-l", "--length"):
+            global chunk_length
+            chunk_length = int(a)
+        elif o in ("-z", "--zip"):
+            compress = True
+        elif o in ("-p", "--prefix"):
+            prefix = a
+        else:
+            assert False, "unhandled option"
+
+    convert_folder(infolder, outfolder, rate_ratio, prefix)
+    if compress:
+        zip_folder(outfolder)
+    if verbose:
+        print("Done.")
+    
+if __name__ == "__main__":
+    main()
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