pySSTV/pysstv/__main__.py

#!/usr/bin/env python

from __future__ import print_function
try:
    from PIL import Image
except ImportError:
    from monoPIL import Image
from argparse import ArgumentParser
from sys import stderr
import color
import grayscale

SSTV_MODULES = [color, grayscale]


def main():
    module_map = build_module_map()
    parser = ArgumentParser(
        description='Converts an image to an SSTV modulated WAV file.')
    parser.add_argument('img_file', metavar='image.png',
                        help='input image file name')
    parser.add_argument('wav_file', metavar='output.wav',
                        help='output WAV file name')
    parser.add_argument(
        '--mode', dest='mode', default='MartinM1', choices=module_map,
        help='image mode (default: Martin M1)')
    parser.add_argument('--rate', dest='rate', type=int, default=48000,
                        help='sampling rate (default: 48000)')
    parser.add_argument('--bits', dest='bits', type=int, default=16,
                        help='bits per sample (default: 16)')
    parser.add_argument('--vox', dest='vox', action='store_true',
                        help='add VOX tones at the beginning')
    parser.add_argument('--fskid', dest='fskid',
                        help='add FSKID at the end')
    parser.add_argument('--chan', dest='chan', type=int,
                        help='number of channels (default: mono)')
    args = parser.parse_args()
    image = Image.open(args.img_file)
    mode = module_map[args.mode]
    if not all(i >= m for i, m in zip(image.size, (mode.WIDTH, mode.HEIGHT))):
        print(('Image must be at least {m.WIDTH} x {m.HEIGHT} pixels '
               'for mode {m.__name__}').format(m=mode), file=stderr)
        raise SystemExit(1)
    s = mode(image, args.rate, args.bits)
    s.vox_enabled = args.vox
    if args.fskid:
        s.add_fskid_text(args.fskid)
    if args.chan:
        s.nchannels = args.chan
    s.write_wav(args.wav_file)


def build_module_map():
    module_map = {}
    for module in SSTV_MODULES:
        for mode in module.MODES:
            module_map[mode.__name__] = mode
    return module_map


if __name__ == '__main__':
    main()