imonlinux
7bbe0ed96f
uses the same code that the LVA uses to capture microphone audio. Defaults to downmix and accepts left and right as variable for --channel.
74 lines
2.3 KiB
Python
74 lines
2.3 KiB
Python
import argparse
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import soundcard as sc
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import numpy as np
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import wave
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DEVICE = "reSpeaker XVF3800 4-Mic Array Analog Stereo"
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SECONDS = 5
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SR = 16000
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BLOCK = 1024
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def main():
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parser = argparse.ArgumentParser(description="Record from soundcard mic to WAV.")
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parser.add_argument(
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"--channel",
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choices=["mix", "left", "right"],
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default="mix",
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help="mix=record 1ch (downmix/default). left/right=record 2ch and select.",
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)
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parser.add_argument("--seconds", type=int, default=SECONDS)
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parser.add_argument("--device", type=str, default=DEVICE)
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parser.add_argument("--out", type=str, default="/tmp/lva_soundcard.wav")
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args = parser.parse_args()
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if args.channel == "mix":
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in_ch = 1
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out_ch = 1
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out_path = args.out
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else:
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in_ch = 2
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out_ch = 1
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# If user didn't override --out, make filename reflect selection
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if args.out == "/tmp/lva_soundcard.wav":
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out_path = f"/tmp/lva_soundcard_{args.channel}.wav"
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else:
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out_path = args.out
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mic = sc.get_microphone(args.device, include_loopback=False)
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print("Using mic:", mic.name)
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print(f"Mode: {args.channel} (request channels={in_ch} -> write channels={out_ch})")
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frames = []
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with mic.recorder(samplerate=SR, channels=in_ch, blocksize=BLOCK) as r:
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for _ in range(int(SR * args.seconds / BLOCK)):
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buf = r.record(BLOCK)
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if in_ch == 1:
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# buf can be (BLOCK,) or (BLOCK, 1) depending on backend
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mono = buf.reshape(-1)
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sample = mono
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else:
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# buf should be (BLOCK, 2)
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if buf.ndim != 2 or buf.shape[1] < 2:
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raise RuntimeError(f"Expected stereo buffer, got shape {buf.shape}")
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idx = 0 if args.channel == "left" else 1
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sample = buf[:, idx]
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rms = float(np.sqrt(np.mean(np.square(sample)))) if sample.size else 0.0
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print(f"rms={rms:.6f}")
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pcm16 = (np.clip(sample, -1.0, 1.0) * 32767.0).astype("<i2")
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frames.append(pcm16.tobytes())
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with wave.open(out_path, "wb") as wf:
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wf.setnchannels(out_ch)
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wf.setsampwidth(2)
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wf.setframerate(SR)
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wf.writeframes(b"".join(frames))
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print("Wrote:", out_path)
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if __name__ == "__main__":
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main()
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