Question

我想录制我的笔记本电脑的麦克风录制的音频，然后说一段延迟后，通过连接到笔记本电脑的耳机播放。我尝试的是以10秒的间隔录制传入的音频作为后台处理＆amp;录制完第一个10秒的音频片段后，通过耳机开始在后台播放。我面临的问题是，在录制结束时，我将所有批次的声音片段组合在一起，在停止一个录音和放大过程中会丢失一些声音样本。重新开始录制下一个传入的声音。

那么，是否有可能让录音继续进行。收集一些样品后开始播放正在进行的录音？或者还有其他任何工作要丢失这些样品吗？

Answer 1

If you just want record and playback, pyaudio has good basic examples here.

However, if you need to customize delay between record and playback then there are various approaches depending upon complexity and efforts.
One way is to record & save chunks of audio files and play them sequentially after some time delay between recording and playback.

It is possible to save small chunks to objects in memory (although I haven't tried that yet).

The playback and recording can be threaded or spawned to run simultaneously. I attempted multiprocessing, however, since I don't have multi-core CPU it may not be seem to be working. You are welcome to develop it further.

So, as discussed first we record and save chunks of audio files using record_audio function.

import pyaudio
import wave
import time
from multiprocessing import Process

def record_audio(AUDIO_FILE):
    #Create audio stream    
    stream = p.open(format=FORMAT,
                    channels=CHANNELS,
                    rate=RATE,
                    input=True,
                    frames_per_buffer=CHUNK)

    # begin recording
    print"* recording audio clip: ",AUDIO_FILE

    frames = []
    for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
        data = stream.read(CHUNK)
        frames.append(data)

    #print"* done recording audio clip:", AUDIO_FILE

    #cleanup objects
    stream.stop_stream()
    stream.close()

    #save frames to audio clips
    print"* sending data to audio file:", AUDIO_FILE
    wf = wave.open(AUDIO_FILE , 'wb')
    wf.setnchannels(CHANNELS)
    wf.setsampwidth(p.get_sample_size(FORMAT))
    wf.setframerate(RATE)
    wf.writeframes(b''.join(frames))
    wf.close()

Next, we define function to play audio chunks using play_audio function.

def play_audio(AUDIO_FILE):
    #open saved audio clip
    wf2 = wave.open(AUDIO_FILE , 'rb')

    #Introduce  playback delay
    time.sleep(AUDIO_DELAY)


    #Define playback audio stream
    stream2 = p.open(format=p.get_format_from_width(wf2.getsampwidth()),
                channels=wf2.getnchannels(),
                rate=wf2.getframerate(),
                output=True)

    data = wf2.readframes(CHUNK)
    print" *************************** playing back audio file:", AUDIO_FILE
    while data != '':        
        stream2.write(data)
        data = wf2.readframes(CHUNK)

    stream2.stop_stream()
    stream2.close()

    p.terminate()

Then we put two functions together in main and (attempt to ) kick off simultaneously.

if __name__=='__main__':

    CHUNK = 1024
    FORMAT = pyaudio.paInt16
    CHANNELS = 2               #stereo
    RATE = 44100
    RECORD_SECONDS = 5         #record chunks of 5 sec
    TOTAL_RECORD_NUMBER = 5    # total chunks to record and play
    AUDIO_DELAY = 5.0          #playback delay in seconds

    x = 0

    while x < TOTAL_RECORD_NUMBER:

        #define audio file clip
        AUDIO_FILE = "audio{0}.wav".format(x)

        #initialize pyaudio
        p = pyaudio.PyAudio()        

        #Kick off record audio function process
        p1 = Process(target = record_audio(AUDIO_FILE))
        p1.start()

        #kick off play audio function process
        p2 = Process(target = play_audio(AUDIO_FILE))        
        p2.start()

        p1.join()
        p2.join()


        #increment record counter
        x += 1

Output:

Python 2.7.9 (default, Dec 10 2014, 12:24:55) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
* recording audio clip:  audio0.wav
* sending data to audio file: audio0.wav
 *************************** playing back audio file: audio0.wav
* recording audio clip:  audio1.wav
* sending data to audio file: audio1.wav
 *************************** playing back audio file: audio1.wav
* recording audio clip:  audio2.wav
* sending data to audio file: audio2.wav
 *************************** playing back audio file: audio2.wav
* recording audio clip:  audio3.wav
* sending data to audio file: audio3.wav
 *************************** playing back audio file: audio3.wav
* recording audio clip:  audio4.wav
* sending data to audio file: audio4.wav
 *************************** playing back audio file: audio4.wav
>>>

As you can see , the processes did not spawn simultaneously. You may develop it further.

Hope this helps.

是否正在播放正在进行的录音？

1 个答案: