52 lines
2.3 KiB
Python
52 lines
2.3 KiB
Python
import pathlib
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import numpy as np
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import wave
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import math
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import tempfile
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import subprocess
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import contextlib
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cyc = 2
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nsamples = 48000 * 60
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path = pathlib.Path("~/Downloads/inputs").expanduser()
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inputs = []
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tempfiles = []
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with contextlib.ExitStack() as stack:
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for file in path.glob("*"):
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mgr = tempfile.NamedTemporaryFile("w")
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stack.enter_context(mgr)
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tempfiles.append(mgr)
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subprocess.run(["ffmpeg", "-i", file, "-ar", "48000", "-ac", "1", "-filter:a", "dynaudnorm=p=1.0:s=5:g=15", "-y", "-f", "wav", mgr.name])
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for t in tempfiles:
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with wave.open(str(t.name), "r") as w:
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assert w.getsampwidth() == 2 and w.getnchannels() == 1 and w.getframerate() == 48000
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inputs.append(np.frombuffer(w.readframes(nsamples), np.dtype(np.int16).newbyteorder("<")).astype(float) / 32768)
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inputs = np.array(inputs) * (1/len(inputs)) # wrong but close enough
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offsets = np.broadcast_to(np.linspace(0, math.pi * 2, num=len(inputs) + 1)[:len(inputs)], (nsamples, len(inputs))).transpose()
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phase = np.broadcast_to(np.linspace(0, math.pi * 2 * cyc, num=nsamples), (len(inputs), nsamples)) + offsets
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empty = np.zeros_like(phase)
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x = np.cos(phase)
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y = np.sin(phase)
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def writeaudio(file, array):
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wr = wave.open(file, "w")
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wr.setnchannels(1)
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wr.setsampwidth(2)
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wr.setframerate(48000)
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wr.writeframes((array * 32768).astype("<i2").tobytes())
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wr.close()
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with tempfile.NamedTemporaryFile("wb") as left:
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with tempfile.NamedTemporaryFile("wb") as front:
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with tempfile.NamedTemporaryFile("wb") as right:
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with tempfile.NamedTemporaryFile("wb") as back:
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writeaudio(left, sum(np.where(-x > 0, -x, empty) * inputs))
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writeaudio(right, sum(np.where(x > 0, x, empty) * inputs))
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writeaudio(front, sum(np.where(y > 0, y, empty) * inputs))
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writeaudio(back, sum(np.where(-y > 0, -y, empty) * inputs))
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print(front.name)
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# layout is technically front left + front right + back left + back right - ignore
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subprocess.run(["ffmpeg", "-i", front.name, "-i", right.name, "-i", back.name, "-i", left.name, "-filter_complex", "[0:a][1:a]join=inputs=4:channel_layout=quad[a]", "-map", "[a]", "/tmp/out.opus"]).check_returncode() |