def write_audio_tracks(self, inputaudio, units, diralign, silence=0.):
"""
Write the first channel of an audio file into separated track files.
Re-sample to 16000 Hz, 16 bits.
@param inputaudio (src - IN) File name of the audio file.
@param units (list - IN) List of tuples (start-time,end-time) of tracks.
@param diralign (str - IN) Directory to write audio tracks.
@param silence float - IN) Duration of a silence to surround the tracks.
"""
channel = autils.extract_audio_channel( inputaudio,0 )
channel = autils.format_channel( channel,16000,2 )
for track,u in enumerate(units):
(s,e) = u
trackchannel = autils.extract_channel_fragment( channel, s, e, silence)
trackname = self._tracknames.audiofilename(diralign, track+1)
autils.write_channel(trackname, trackchannel)
def _fix_window_asr(self, fromtime, totime, fromtoken, totoken, channel, pronlist, toklist, diralign, N):
"""
Fix asr result in a window.
Return the list of anchors the ASR found in that window.
"""
# create audio file
fnw = os.path.join(diralign, "asr")
fna = os.path.join(diralign, "asr.wav")
trackchannel = autils.extract_channel_fragment( channel, fromtime, totime, 0.2)
autils.write_channel( fna, trackchannel )
# call the ASR engine to recognize tokens of this track
self._aligner.set_phones( " ".join( pronlist[fromtoken:totoken] ) )
self._aligner.set_tokens( " ".join( toklist[fromtoken:totoken] ) )
self._aligner.run_alignment(fna, fnw, N)
# get the tokens time-aligned by the ASR engine
wordalign = self._alignerio.read_aligned(fnw)[1] # (starttime,endtime,label,score)
wordalign = self._adjust_asr_result(wordalign, fromtime, 0.2)
# ignore the last word: we can't know if the word is entire or was cut
if len(wordalign) > 3:
wordalign.pop()
# list of tokens the ASR automatically time-aligned
tman = [token for token in toklist[fromtoken:totoken]]
# list of tokens manually transcribed
tasr = [(token,score) for (start,end,token,score) in wordalign]
# Find matching tokens: the anchors
matchingslist = self._fix_matchings_list( tman,tasr,N )
anchors = []
for match in matchingslist:
i = match[0] # ref
hi = match[1] # hyp
s = wordalign[hi][0]
e = wordalign[hi][1]
anchors.append( (s,e,fromtoken+i) )
return anchors