python錄音

學(xué)習(xí)目標(biāo)：掌握python的pyaudio擴(kuò)展包和Wave模塊錄制語(yǔ)音的方法

• Wav音頻:聲道數(shù)，采樣頻率,，量化位數(shù)

python Wav包是自帶的,，pyaudio需要下載

pip3 install pyaudio

python讀Wav文件：

  fp=wave.open('','rb')
    nf=fp.getnframes()#獲取文件的采樣點(diǎn)數(shù)量
    print('sampwidth:',fp.getsampwidth())
    print('framerate:',fp.getframerate())
    print('channels:',fp.getnchannels())
    f_len=nf*2#文件長(zhǎng)度計(jì)算，每個(gè)采樣2個(gè)字節(jié)
    audio_data=fp.readframes(nf)

python寫(xiě)Wav文件：

def save_wave_file(filename,data):
    '''save the date to the wavfile'''
    wf=wave.open(filename,'wb')
    wf.setnchannels(channels)#聲道
    wf.setsampwidth(sampwidth)#采樣字節(jié) 1 or 2
    wf.setframerate(framerate)#采樣頻率 8000 or 16000
    wf.writeframes(b''.join(data))#https:///questions/32071536/typeerror-sequence-item-0-expected-str-instance-bytes-found
    wf.close()

利用PyAudio錄音：

def my_record():
    pa=PyAudio()
    stream=pa.open(format = paInt16,channels=1,
                   rate=framerate,input=True,
                   frames_per_buffer=NUM_SAMPLES)
    my_buf=[]
    count=0
    while count<TIME*20:#控制錄音時(shí)間
        string_audio_data = stream.read(NUM_SAMPLES)#一次性錄音采樣字節(jié)大小
        my_buf.append(string_audio_data)
        count+=1
        print('.')
    save_wave_file('01.wav',my_buf)
    stream.close()

利用PyAudio播放音頻

chunk=2014
def play():
    wf=wave.open(r'01.wav','rb')
    p=PyAudio()
    stream=p.open(format=p.get_format_from_width(wf.getsampwidth()),channels=
    wf.getnchannels(),rate=wf.getframerate(),output=True)
    while True:
        data=wf.readframes(chunk)
        if data=='':break
        stream.write(data)
    stream.close()
    p.terminate()

完整錄音播放的demo

import wave
from pyaudio import PyAudio,paInt16

framerate=8000
NUM_SAMPLES=2000
channels=1
sampwidth=2
TIME=2
def save_wave_file(filename,data):
    '''save the date to the wavfile'''
    wf=wave.open(filename,'wb')
    wf.setnchannels(channels)
    wf.setsampwidth(sampwidth)
    wf.setframerate(framerate)
    wf.writeframes(b''.join(data))
    wf.close()

def my_record():
    pa=PyAudio()
    stream=pa.open(format = paInt16,channels=1,
                   rate=framerate,input=True,
                   frames_per_buffer=NUM_SAMPLES)
    my_buf=[]
    count=0
    while count<TIME*20:#控制錄音時(shí)間
        string_audio_data = stream.read(NUM_SAMPLES)
        my_buf.append(string_audio_data)
        count+=1
        print('.')
    save_wave_file('01.wav',my_buf)
    stream.close()

chunk=2014
def play():
    wf=wave.open(r'01.wav','rb')
    p=PyAudio()
    stream=p.open(format=p.get_format_from_width(wf.getsampwidth()),channels=
    wf.getnchannels(),rate=wf.getframerate(),output=True)
    while True:
        data=wf.readframes(chunk)
        if data=='':break
        stream.write(data)
    stream.close()
    p.terminate()

if __name__ == '__main__':
    my_record()
    print('Over!') 
    play()

更多用法詳見(jiàn) pyaudio文檔