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I want to record and play my voice using pyaudio and wave lib but I don't know how to do it because wave lib requires a path to a file and even if I'm trying to set it as a variable with list of bytes recorded a few second ago, still doesn't work beacuse I can't use 'read' for a list. Does someone have some idea? I want to make a looper like KORG stuff, etc

I want to play it immediately after stopped recording, like real looper, without saving record as file.

There is my code (Python 3.4):

def record(self): #recording a voice

    #var for bytes from recording
    self.stream = self.player.open(format = self.FORMAT,
            channels = self.CHANNELS,
            rate = self.RATE,
            input = True,
            frames_per_buffer = self.CHUNK)

    print("Recording")

    self.frames = [] #byte list

    #recoring for a few seconds (5sec at this moment)
    for i in range(0, int(self.RATE / self.CHUNK * self.RECORD_SECONDS)):
        self.data = self.stream.read(self.CHUNK) #sing stream do data var
        self.frames.append(self.data) #add bytes to the end of a list
    print("Stop recording")

    self.stopRecording()

def stopRecording(self):

    self.stream.stop_stream()
    self.stream.close()
    print("Recording has been stopped")

    self.play()

def play(self): #playing a record
    print("Playing")


    f = wave.open(self.frames,"rb")  
    #read data  
    data = f.readframes(CHUNK)  

    #play stream  
    while data != '':  
        self.stream.write(data)  
        data = f.readframes(CHUNK)  

    self.stopPlaying()
Kamil Zieliński
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  • you get any error ?? a quick look say me that you not need it `f = wave.open(self.frames,"rb")` – ederwander Jul 30 '14 at 16:11
  • But how should I `readframes` from this list? It's yelling that `'list' has no attribute 'wave'` or no `read` attribute (whatever I'm trying to do) – Kamil Zieliński Jul 30 '14 at 17:21

1 Answers1

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After stop your record you need join your appended data, use data = ''.join(self.frames), and at the end build a loop (for, while) to stream all your byte list, here is how i did: 

import pyaudio

chunk = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 41000
RECORD_SECONDS = 5


p = pyaudio.PyAudio()

stream = p.open(format = FORMAT,
    channels = CHANNELS,
    rate = RATE,
    input = True,
    output = True,
    frames_per_buffer = chunk)



print ("***Recording***")

all = [] 

for i in range(0, RATE / chunk * RECORD_SECONDS):
     data = stream.read(chunk)
     all.append(data) 


print("***Stop recording***")


print ("***START PLAY***")


data = ''.join(all)


for i in range(0, len(data), chunk):
    stream.write(data[i:i+chunk])
ederwander
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