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clean_removesilence.py
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clean_removesilence.py
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'''
AAA lllllll lllllll iiii
A:::A l:::::l l:::::l i::::i
A:::::A l:::::l l:::::l iiii
A:::::::A l:::::l l:::::l
A:::::::::A l::::l l::::l iiiiiii eeeeeeeeeeee
A:::::A:::::A l::::l l::::l i:::::i ee::::::::::::ee
A:::::A A:::::A l::::l l::::l i::::i e::::::eeeee:::::ee
A:::::A A:::::A l::::l l::::l i::::i e::::::e e:::::e
A:::::A A:::::A l::::l l::::l i::::i e:::::::eeeee::::::e
A:::::AAAAAAAAA:::::A l::::l l::::l i::::i e:::::::::::::::::e
A:::::::::::::::::::::A l::::l l::::l i::::i e::::::eeeeeeeeeee
A:::::AAAAAAAAAAAAA:::::A l::::l l::::l i::::i e:::::::e
A:::::A A:::::A l::::::ll::::::li::::::ie::::::::e
A:::::A A:::::A l::::::ll::::::li::::::i e::::::::eeeeeeee
A:::::A A:::::A l::::::ll::::::li::::::i ee:::::::::::::e
AAAAAAA AAAAAAAlllllllllllllllliiiiiiii eeeeeeeeeeeeee
/ __ \ | (_) / _ \ | ___ \_ _| _
| / \/ | ___ __ _ _ __ _ _ __ __ _ / /_\ \| |_/ / | | (_)
| | | |/ _ \/ _` | '_ \| | '_ \ / _` | | _ || __/ | |
| \__/\ | __/ (_| | | | | | | | | (_| | | | | || | _| |_ _
\____/_|\___|\__,_|_| |_|_|_| |_|\__, | \_| |_/\_| \___/ (_)
__/ |
|___/
___ _ _
/ _ \ | (_)
/ /_\ \_ _ __| |_ ___
| _ | | | |/ _` | |/ _ \
| | | | |_| | (_| | | (_) |
\_| |_/\__,_|\__,_|_|\___/
This cleaning script takes in a folder of audio files and removes the silence
from these audi files using a voice activity detector.
This cleaning script is enabled if default_audio_cleaners=['clean_removesilence']
'''
import collections, contextlib, sys, wave, webrtcvad, os, sys, uuid
def convert_mono(audiofile):
# force conversion to mono to remove silence (16000 Hz, mono, 16 bit depth)
tempfile=str(uuid.uuid1())+'.wav'
os.system('sox %s -r 16000 -c 1 -b 16 %s'%(audiofile,tempfile))
os.remove(audiofile)
os.rename(tempfile, audiofile)
def read_wave(path):
"""Reads a .wav file.
Takes the path, and returns (PCM audio data, sample rate).
"""
with contextlib.closing(wave.open(path, 'rb')) as wf:
num_channels = wf.getnchannels()
assert num_channels == 1
sample_width = wf.getsampwidth()
assert sample_width == 2
sample_rate = wf.getframerate()
assert sample_rate in (8000, 16000, 32000, 48000)
pcm_data = wf.readframes(wf.getnframes())
return pcm_data, sample_rate
def write_wave(path, audio, sample_rate):
"""Writes a .wav file.
Takes path, PCM audio data, and sample rate.
"""
with contextlib.closing(wave.open(path, 'wb')) as wf:
wf.setnchannels(1)
wf.setsampwidth(2)
wf.setframerate(sample_rate)
wf.writeframes(audio)
class Frame(object):
"""Represents a "frame" of audio data."""
def __init__(self, bytes, timestamp, duration):
self.bytes = bytes
self.timestamp = timestamp
self.duration = duration
def frame_generator(frame_duration_ms, audio, sample_rate):
"""Generates audio frames from PCM audio data.
Takes the desired frame duration in milliseconds, the PCM data, and
the sample rate.
Yields Frames of the requested duration.
"""
n = int(sample_rate * (frame_duration_ms / 1000.0) * 2)
offset = 0
timestamp = 0.0
duration = (float(n) / sample_rate) / 2.0
while offset + n < len(audio):
yield Frame(audio[offset:offset + n], timestamp, duration)
timestamp += duration
offset += n
def vad_collector(sample_rate, frame_duration_ms,
padding_duration_ms, vad, frames):
"""Filters out non-voiced audio frames.
Given a webrtcvad.Vad and a source of audio frames, yields only
the voiced audio.
Uses a padded, sliding window algorithm over the audio frames.
When more than 90% of the frames in the window are voiced (as
reported by the VAD), the collector triggers and begins yielding
audio frames. Then the collector waits until 90% of the frames in
the window are unvoiced to detrigger.
The window is padded at the front and back to provide a small
amount of silence or the beginnings/endings of speech around the
voiced frames.
Arguments:
sample_rate - The audio sample rate, in Hz.
frame_duration_ms - The frame duration in milliseconds.
padding_duration_ms - The amount to pad the window, in milliseconds.
vad - An instance of webrtcvad.Vad.
frames - a source of audio frames (sequence or generator).
Returns: A generator that yields PCM audio data.
"""
num_padding_frames = int(padding_duration_ms / frame_duration_ms)
# We use a deque for our sliding window/ring buffer.
ring_buffer = collections.deque(maxlen=num_padding_frames)
# We have two states: TRIGGERED and NOTTRIGGERED. We start in the
# NOTTRIGGERED state.
triggered = False
voiced_frames = []
for frame in frames:
is_speech = vad.is_speech(frame.bytes, sample_rate)
sys.stdout.write('1' if is_speech else '0')
if not triggered:
ring_buffer.append((frame, is_speech))
num_voiced = len([f for f, speech in ring_buffer if speech])
# If we're NOTTRIGGERED and more than 90% of the frames in
# the ring buffer are voiced frames, then enter the
# TRIGGERED state.
if num_voiced > 0.9 * ring_buffer.maxlen:
triggered = True
sys.stdout.write('+(%s)' % (ring_buffer[0][0].timestamp,))
# We want to yield all the audio we see from now until
# we are NOTTRIGGERED, but we have to start with the
# audio that's already in the ring buffer.
for f, s in ring_buffer:
voiced_frames.append(f)
ring_buffer.clear()
else:
# We're in the TRIGGERED state, so collect the audio data
# and add it to the ring buffer.
voiced_frames.append(frame)
ring_buffer.append((frame, is_speech))
num_unvoiced = len([f for f, speech in ring_buffer if not speech])
# If more than 90% of the frames in the ring buffer are
# unvoiced, then enter NOTTRIGGERED and yield whatever
# audio we've collected.
if num_unvoiced > 0.9 * ring_buffer.maxlen:
sys.stdout.write('-(%s)' % (frame.timestamp + frame.duration))
triggered = False
yield b''.join([f.bytes for f in voiced_frames])
ring_buffer.clear()
voiced_frames = []
if triggered:
sys.stdout.write('-(%s)' % (frame.timestamp + frame.duration))
sys.stdout.write('\n')
# If we have any leftover voiced audio when we run out of input,
# yield it.
if voiced_frames:
yield b''.join([f.bytes for f in voiced_frames])
def clean_removesilence(audiofile):
# convert to mono for the voice activity detector to work.
convert_mono(audiofile)
audio, sample_rate = read_wave(audiofile)
# set aggressiveness here. [1,3]
vad = webrtcvad.Vad(int(1))
frames = frame_generator(30, audio, sample_rate)
frames = list(frames)
segments = vad_collector(sample_rate, 30, 300, vad, frames)
framelist=list()
for i, segment in enumerate(segments):
path = 'chunk-%002d.wav' % (i,)
print(' Writing %s' % (path,))
write_wave(path, segment, sample_rate)
framelist.append(path)
soxcmd='sox'
for i in range(len(framelist)):
soxcmd=soxcmd+' %s'%(framelist[i])
soxcmd=soxcmd+' %s'%(audiofile)
print(soxcmd)
os.rename(audiofile,audiofile[0:-4]+'_temp.wav')
os.system(soxcmd)
# remove temporary files and leave only cleaned files
os.remove(audiofile[0:-4]+'_temp.wav')
for i in range(len(framelist)):
os.remove(framelist[i])
return [audiofile]