def do_POST(self):
"""All post requests are sent using AJAX from the web app. The requests
should contain one waveform file to be parsed and added to the pattern
dictionary. After the file is parsed, an output wavform will be sent."""
try:
# get the form data
form = cgi.FieldStorage(
fp=self.rfile,
headers=self.headers,
environ={'REQUEST_METHOD':'POST',
'CONTENT_TYPE':self.headers['Content-Type'],
})
# create a new generator object
g = generator.Generator()
# load pickle data into the generator
if os.path.exists("pattern-data.pickle"):
g.pattern_dictionary = pickle.load(open("pattern-data.pickle", "rb" ))
# if the user submitted a file, add it to the generator's dictionary
f = form['file'].file
f.seek(0, 2)
if f.tell() > 0:
print "Success: A valid input file was received."
f.seek(0,0)
g.add_wave(f)
else:
print "Warning: No valid file was received."
# dump the data into a pickle file
pickle.dump(g.pattern_dictionary, open("pattern-data.pickle", "wb"))
# build an output song
print "Loaded Pattern Dictionary. Generating Song"
output = StringIO.StringIO()
waveform.to_file(output, waveform.from_string(str(g.run())))
print "Song Finished"
# send header and body encoded in base64, which is what the web app
# is using
self.send_response(200)
self.send_header("Content-type", "application/octet-stream")
self.end_headers()
self.wfile.write(base64.b64encode(output.getvalue()))
except:
print "Unexpected error:", sys.exc_info()[0]
raise
import sys
sys.path.append("../")
# ******************************************************************************
import waveform
if __name__=="__main__":
if len(sys.argv) > 1:
# LOAD A WAVEFORM FROM FILE
wav = waveform.from_file(sys.argv[1])
originalsamplewidth = wav.getsamplewidth()
originalchannelcount = wav.getchannelcount()
originalsize = len(wav.getsamples())
# TEST ONE: LOADING AND WRITING
# write the data to a file
waveform.to_file('readertest.wav', wav)
# check that the files are identical, ie. the data was read and processed properly
import filecmp
assert filecmp.cmp(sys.argv[1], 'readertest.wav')
# delete the created test file
from os import remove
remove('readertest.wav')
# TEST TWO: CHANGING THE CHANNEL COUNT
# change the waveform sample width
wav.setchannelcount(1)
# check that the sample data reflects the change
assert len(wav.getsamples()) == originalsize / originalchannelcount
# TEST THREE: CHANGING SAMPLE WIDTH
# change the waveform sample width