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[FILE BEGIN]
1import sounddevice as sd
2import soundfile as sf
3
4def record_audio(input_device, filename="output.wav", sample_rate=44100, channels=2, duration=None):
5    """Record audio from input_device into a WAV file.
6    
7    Args:
8        input_device (int): device index
9        filename (str): output filename
10        sample_rate (int): sample rate
11        channels (int): number of channels
12        duration (float | None): seconds to record (None = until Enter)
13    """
14    with sf.SoundFile(filename, mode='w', samplerate=sample_rate,
15                      channels=channels) as file:
16        def audio_callback(indata, frames, time, status):
17            if status:
18                print(status)
19            file.write(indata)
20
21        with sd.InputStream(device=input_device,
22                            samplerate=sample_rate,
23                            channels=channels,
24                            callback=audio_callback):
25            if duration:
26                sd.sleep(int(duration * 1000))
27            else:
28                input(f"Recording to {filename}... press Enter to stop\n")
29
[FILE END]
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