add test signal creation script

import argparse

import numpy as np

OC_TO_NCHANNELS = {

    "MONO": 1,

    "STEREO": 2,

    "BINAURAL": 2,

    "BINAURAL_ROOM": 2,

    "5_1": 6,

    "7_1": 8,

    "5_1_2": 8,

    "5_1_4": 10,

    "7_1_4": 12,

    "FOA": 4,

    "HOA2": 9,

    "HOA3": 16,

    "EXT": 1,

    "ISM1": 1,

    "ISM2": 2,

    "ISM3": 3,

    "ISM4": 4,

    "MASA1TC": 1,

    "MASA2TC": 2,

}

SIGNAL_SOURCE = "scripts/testv/stv48c.pcm"

CUT_LEN_SECS = 1

FS = 48000

def main(args):

	channels = OC_TO_NCHANNELS[ args.outformat ]

	outfile = args.outfile

	signal = gen_signal(channels)

	# write out interleaved

	signal.reshape(-1, 1).tofile(outfile)

def gen_signal(channels:int) -> np.ndarray:

	# get the measurement signal from the source file (mono file)

	signal = np.fromfile(SIGNAL_SOURCE, dtype=np.int16)

	# shorten to one second

	signal = signal[:FS * CUT_LEN_SECS]

	# create other channels with same signal

	signal = np.repeat(signal.reshape((-1, 1)), channels, axis=1)

	return signal

if __name__ == "__main__":

	parser = argparse.ArgumentParser()

	parser.add_argument("outformat", type=str, choices=list(OC_TO_NCHANNELS.keys()), help="output format to generate for")

	parser.add_argument("outfile", help="output .pcm file with measurement signal")

	args = parser.parse_args()

	main(args)

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