使用 PyAudio 录制扬声器输出 [英] Record speakers output with PyAudio

问题描述

我正在尝试使用 PyAudio 录制计算机扬声器的输出.
我试图修改 PyAudio 文档中给出的代码示例，但它不起作用.

I'm trying to record the output from my computer speakers with PyAudio.
I tried to modify the code example given in the PyAudio documentation, but it doesn't work.

从技术上讲，没有错误.我得到文件 output.wav 并且我可以打开它，但是没有声音.在 Audacity 上，我只能看到一条直线.

Technically, there's no error. I obtain the file output.wav and I can open it, but there's no sound. On Audacity, I can only see a straight line.

怎么了?

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"] #The part I have modified

stream = p.open(format=FORMAT,
                channels=CHANNELS,
                rate=RATE,
                input=True,
                frames_per_buffer=CHUNK,
                input_host_api_specific_stream_info=SPEAKERS) #The part I have modified

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()

推荐答案

如果有人仍然像我一样在这个问题上磕磕绊绊，我找到了一个 PyAudio fork 在 Windows 上记录输出.

In case someone is still stumbling over this like me, I found a PyAudio fork to record the output on windows.

说明:

官方 PyAudio 版本无法记录输出.但是在 Windows Vista 及更高版本中，引入了一个新的 API WASAPI，其中包括在环回模式下打开到输出设备的流的能力.在这种模式下，流将表现得像一个输入流，能够记录传出的音频流.

The official PyAudio build isn't able to record the output. BUT with Windows Vista and above, a new API, WASAPI was introduced, which includes the ability to open a stream to an output device in loopback mode. In this mode the stream will behave like an input stream, with the ability to record the outgoing audio stream.

要设置模式，必须设置一个特殊标志(AUDCLNT_STREAMFLAGS_LOOPBACK).由于官方版本不支持此标志，因此需要编辑 PortAudio 和 PyAudio，以添加回送支持.

To set the mode, one has to set a special flag (AUDCLNT_STREAMFLAGS_LOOPBACK). Since this flag is not supported in the official build one needs to edit PortAudio as well as PyAudio, to add loopback support.

新选项:

"as_loopback":(true|false)

"as_loopback":(true|false)

这篇关于使用 PyAudio 录制扬声器输出的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！