语音活性检测器py-webrtcvad安装使用

谷歌为WebRTC项目开发的VAD是目前最优秀、最先进和免费的产品之一。webrtcvad是WebRTC语音活动检测器(VAD)的python接口。兼容python2和python3。功能是将一段音频数据分为静音与非静音。它对于电话和语音识别很有用。

1、安装pip

yum -y install epel-release
yum -y install python-pip

2、安装webrtcvad

yum -y install python-devel
pip install webrtcvad

3、webrtcvad测试脚本（test_webrtcvad.py）

import collections
import contextlib
import sys
import wave

import webrtcvad

def read_wave(path):
    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)
        pcm_data = wf.readframes(wf.getnframes())
        return pcm_data, sample_rate

def write_wave(path, audio, 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):
    def __init__(self, bytes, timestamp, duration):
        self.bytes = bytes
        self.timestamp = timestamp
        self.duration = duration

def frame_generator(frame_duration_ms, audio, sample_rate):
    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):
    num_padding_frames = int(padding_duration_ms / frame_duration_ms)
    ring_buffer = collections.deque(maxlen=num_padding_frames)
    triggered = False
    voiced_frames = []
    for frame in frames:
        sys.stdout.write(
            '' if vad.is_speech(frame.bytes, sample_rate) else '')
        if not triggered:
            ring_buffer.append(frame)
            num_voiced = len([f for f in ring_buffer
                              if vad.is_speech(f.bytes, sample_rate)])
            if num_voiced > 0.9 * ring_buffer.maxlen:
                sys.stdout.write('+(%s)' % (ring_buffer[0].timestamp,))
                triggered = True
                voiced_frames.extend(ring_buffer)
                ring_buffer.clear()
        else:
            voiced_frames.append(frame)
            ring_buffer.append(frame)
            num_unvoiced = len([f for f in ring_buffer
                                if not vad.is_speech(f.bytes, sample_rate)])
            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 voiced_frames:
        yield b''.join([f.bytes for f in voiced_frames])

def main(args):
    if len(args) != 2:
        sys.stderr.write(
            'Usage: example.py <aggressiveness> <path to wav file>\n')
        sys.exit(1)
    audio, sample_rate = read_wave(args[1])
    vad = webrtcvad.Vad(int(args[0]))
    frames = frame_generator(30, audio, sample_rate)
    frames = list(frames)
    segments = vad_collector(sample_rate, 30, 300, vad, frames)
    for i, segment in enumerate(segments):
        #path = 'chunk-%002d.wav' % (i,)
        print('--end')
        #write_wave(path, segment, sample_rate)

if __name__ == '__main__':
    main(sys.argv[1:])

4、运行命令（其中，第一个参数为敏感系数，取值0-3，越大表示越敏感，越激进，对细微的声音频段都可以识别出来；第二个参数为wav文件存放路径，目前仅支持8K，16K，32K的采样率，示例wav文件下载：73.wav 链接：https://pan.baidu.com/s/19YJB9u0zvCFGBLDRisK1KQ 密码：fgkf）

[root@host---- ~]# python test_webrtcvad.py  /home/.wav
+(2.1)-(3.36)--end
+(3.57)-(14.43)--end
+(15.3)-(16.14)--end
+(21.21)-(22.47)--end
+(22.68)-(24.6)--end
+(24.66)-(26.76)--end
+(26.76)-(27.81)--end
+(27.87)-(31.38)--end
+(31.38)-(32.91)--end
+(33.21)-(35.04)--end
+(35.73)-(41.43)--end
+(42.66)-(43.8)--end
+(43.95)-(51.03)--end
+(51.15)-(53.82)--end
+(53.82)-(59.85)--end
+(60.51)-(64.74)--end
+(65.46)-(67.26)--end
+(67.74)-(69.39)--end
+(69.42)-(74.55)--end
+(74.55)-(81.24)--end
+(81.51)-(87.66)--end
+(87.9)-(89.76)--end
+(91.08)-(92.04)--end
+(92.31)-(96.9)--end
+(97.23)-(102.27)--end
+(102.51)-(104.43)--end
+(104.43)-(105.9)--end
+(106.38)-(108.12)--end
+(108.69)-(110.16)--end
+(111.12)-(113.13)--end
+(113.13)-(114.87)--end
+(114.87)-(118.08)--end