如何在Finally:语句中停止使用PyAudio录音

Question

我想知道是否有一种方法可以停止记录并导出Python中finally:语句中的记录。示例：假设我正在录制，然后我的脚本在录制时突然崩溃，是否有办法停止录制和导出这种情况？

我尝试制作一个单独的函数来导出并停止记录并最终运行：，但这不起作用，它只是创建了一个新文件。任何帮助将不胜感激。我的代码如下：

import pyaudio
import wave
import time
import signal
from datetime import datetime

# Configuration
CHUNK = 1024
FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 44100
RECORD_SECONDS = 10
# Initialize PyAudio
audio = pyaudio.PyAudio()

def record_audio(filename):
    stream = audio.open(format=FORMAT, channels=CHANNELS,
                        rate=RATE, input=True, frames_per_buffer=CHUNK)
    print("Recording started")

    frames = []
    data = stream.read(CHUNK)
    frames.append(data)

    print("Recording stopped")
    stream.stop_stream()
    stream.close()

    # Save to WAV file
    wf = wave.open(filename, 'wb')
    wf.setnchannels(CHANNELS)
    wf.setsampwidth(audio.get_sample_size(FORMAT))
    wf.setframerate(RATE)
    wf.writeframes(b''.join(frames))
    wf.close()

def main():
    try:
       while True:
                timestamp = datetime.now().strftime("%m-%d-%Y_%H-%M-%S")
                wav_filename = f"/home/henrikkoehler/Desktop/Audio_Files/{timestamp}.wav"

                record_audio(wav_filename)

         
                print(f"Audio saved to {wav_filename}")

                # Wait a bit to avoid multiple recordings from a single press
                time.sleep(1)

    except KeyboardInterrupt:
        print("Exiting...")

    except:
        time.sleep(1)
        t_end = time.time() + 15 * 1
        while time.time() < t_end:
            print("Error! Restart!")

    finally:
        audio.terminate()

if __name__ == "__main__":
    main()

Answer 1

要回答您的问题，只需将您的文件写入（

#Save to WAV file

代码）移动到您的

finally

语句中，然后您的

audio.terminate()

应该可以工作。

finally:
    try: #attempt to close stream/recording in case it has not been closed
        stream.stop_stream()
        stream.close()
    except: pass #if already closed and an error is given, don't do anything

    # Save to WAV file
    wf = wave.open(filename, 'wb')
    wf.setnchannels(CHANNELS)
    wf.setsampwidth(audio.get_sample_size(FORMAT))
    wf.setframerate(RATE)
    wf.writeframes(b''.join(frames))
    wf.close()

    audio.terminate()

但是……

首先，在

while True

函数中使用

main()

将会一个接一个地重复创建录音，即使您已经录制了一个录音。除非这是您想要做的，否则您应该删除

while

循环并将代码从

record_audio()

函数移回到

main()

函数中。

其次，你的代码只是记录/读取一个单独的块，然后完成记录。 要记录一定的持续时间，请使用 for 循环：

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