sndpipe/examples/sin.py

#!/usr/bin/python3

import argparse
import sys

from synth import *

parser = argparse.ArgumentParser(description="Generate sinwaves")
parser.add_argument("--output-freq", "-f", type=int, default=48000)
parser.add_argument("--bit-size", "-B", choices=['8','16','32'], default='8',
                    help="Output numbers bit size")
parser.add_argument("--endianess", "-e", choices=['big', 'little'],
                    default='little')
parser.add_argument("--signed", "-S", action="store_true", default=False)
parser.add_argument("--float32", "-F", action="store_true", default=False)
parser.add_argument("--samples", "-s", type=int, default=4096)
parser.add_argument("--channels", "-c", type=int, default=2)
parser.add_argument("--angle-step", "-a", type=float, default=.075)

args = parser.parse_args()

args.bit_size = int(args.bit_size)
print(args, file=sys.stderr)

if args.float32:
    samples = sinwave_float32(step=args.angle_step, endianess=args.endianess)
    buff = bytearray([0 for _ in range(args.samples*args.channels*4)])
    while True:
        for i in range(0,args.samples*args.channels,4):
            buff[i:i+4] = next(samples)
        sys.stdout.buffer.write(buff)
    exit(0)

wv0 = sinwave(args.angle_step, bitsz=args.bit_size, signed=args.signed)
samples = output_sampler(wv0, channels=args.channels, samples=args.samples,
                         freq=args.output_freq, bitsz=args.bit_size,
                         endianess=args.endianess, signed=args.signed)
while True:
    smpl = next(samples)
    sys.stdout.buffer.write(smpl)
exit(0)