def _generate_waveform(self):
# Relative path to our wave file (from MEDIA_ROOT)
wavPath = self.wav.name
# Absolute path to our wave file
wavPathAbsolute = os.path.join(MEDIA_ROOT, wavPath)
idString = str(self.id)
# Get length of audio (samples)
length = audioHelpers.getLength(wavPathAbsolute)
# For each zoom level
for zoomLevel in AudioFile.ZOOM_LEVELS:
# Path to the image for the waveform at this zoom level
waveformPath = self._get_waveform_path(zoomLevel)
audioHelpers.generateWaveform(
# from this wave file
wavPathAbsolute,
# put waveform here
waveformPath,
# At zoomLevel px per second (width)
zoomLevel * length,
# Height
AudioFile.WAVEFORM_IMAGE_HEIGHT
)
def save(self, f = None, *args, **kwargs):
# if we're updating not initializing
if self.pk:
return super(AudioFile,self).save(*args,**kwargs)
# Get original filename of uploaded file
name = str(f)
self.name = name
# Save ourself so we can get an id for the filename
super(AudioFile, self).save(*args, **kwargs)
# Using this AudioFile object's id, create filenames
idString = str(self.id)
wavName = idString+'.wav'
oggName = idString+'.ogg'
mp3Name = idString+'.mp3'
# grab the path of the temporary uploaded file. This is where the user's
# uploaded file exists currently.
inputFilePath = f.temporary_file_path()
# Create files with dummy contents but with proper names.
self.wav.save(wavName, SimpleUploadedFile(wavName, 'temp contents'), save = False)
self.ogg.save(oggName, SimpleUploadedFile(oggName, 'temp contents'), save = False)
self.mp3.save(mp3Name, SimpleUploadedFile(mp3Name, 'temp contents'), save = False)
# Now we placeholders for the audio files.
# The input is the temporary uploaded file location
wavInput = f.temporary_file_path()
# output was determined above
wavOutput = os.path.join(MEDIA_ROOT, self.wav.name)
# the ogg file will be encoded from the normalized wav file
oggInput = wavOutput
oggOutput = os.path.join(MEDIA_ROOT, self.ogg.name)
# and so will the mp3
mp3Input = wavOutput
mp3Output = os.path.join(MEDIA_ROOT, self.mp3.name)
# now overwrite the dummy files with the actual encodes
# We will first normalize the wav file (convert to proper sample rate,
# etc). NOTE: this doesn't actually mean "normalize" to 0db, but
# hopefully in the future.
audioHelpers.toNormalizedWav(wavInput, wavOutput)
# Do the same for ogg
audioHelpers.toOgg(oggInput, oggOutput)
# and mp3
audioHelpers.toMp3(mp3Input, mp3Output)
# Generate the waveform onto disk
self._generate_waveform()
# Save duration of audio file in seconds
self.duration = audioHelpers.getLength(wavOutput)
super(AudioFile, self).save(*args, **kwargs)
event = AudioFileUploadedEvent(
user = self.uploader,
audioFile = self,
collection = self.collection
)
event.save()
