PyAudio-如何在单个流中捕获麦克风和系统声音？

Question

我正在尝试使用pyaudio构建一个可以记录扬声器和麦克风声音的应用程序，但我只是不知道如何同时记录两者。我尝试启用立体声混音器，但由于我只能听声音而无法正常工作从扬声器。我正在使用的这段代码使用pyaudio在后台线程中记录来自默认麦克风的音频：

import pyaudio
import wave
import threading
import time
import subprocess

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "tmp/tmp.wav"

class recorder:
    def __init__(self):
        self.going = False
        self.process = None
        self.filename = "ScreenCapture.mpg"
    def record(self,filename):
        try:
            if self.process.is_alive():
                self.going = False
        except AttributeError:
            print("test")
        self.process = threading.Thread(target=self._record)
        self.process.start()
        self.filename = filename
    def _record(self):
        p = pyaudio.PyAudio()
        stream = p.open(format=FORMAT,
                        channels=CHANNELS,
                        rate=RATE,
                        input=True,
                        frames_per_buffer=CHUNK)

        print("* recording")

        frames = []

        self.going = True

        while self.going:
            data = stream.read(CHUNK)
            frames.append(data)

        print("* done recording")

        stream.stop_stream()
        stream.close()
        p.terminate()

        wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
        wf.setnchannels(CHANNELS)
        wf.setsampwidth(p.get_sample_size(FORMAT))
        wf.setframerate(RATE)
        wf.writeframes(b''.join(frames))
        wf.close()


    def stop_recording(self):
        self.going = False

我正在使用Windows，我还可以使用其他库，不仅是PyAudio。我只需要完成这项工作即可。

编辑：我发现此代码记录了扬声器的输出，但无法在我的应用程序中使用它：

import pyaudio
import wave

CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "output.wav"

p = pyaudio.PyAudio()

SPEAKERS = p.,get_default_output_device_info()["hostApi"] 
stream = p.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input=True,
                frames_per_buffer=CHUNK,
                input_host_api_specific_stream_info=SPEAKERS,
                as_loopback=True) 

print("* recording")

frames = []

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

print("* done recording")

stream.stop_stream()
stream.close()
p.terminate()

wf = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
wf.setnchannels(CHANNELS)
wf.setsampwidth(p.get_sample_size(FORMAT))
wf.setframerate(RATE)
wf.writeframes(b''.join(frames))
wf.close()

Answer 1

您可以使用2个单独的线程将2个不同的设备（提供单独的设备索引）记录到单独的Wav文件中。