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43 lines
965 B
Python
43 lines
965 B
Python
#!/usr/bin/env python
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from __future__ import division
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from sstv import SSTV, byte_to_freq
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class GrayscaleSSTV(SSTV):
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def gen_freq_bits(self):
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for item in SSTV.gen_freq_bits(self):
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yield item
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for line in xrange(self.HEIGHT):
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for item in self.horizontal_sync():
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yield item
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for item in self.encode_line(line):
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yield item
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def encode_line(self, line):
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msec_pixel = self.SCAN / self.WIDTH
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image = self.image
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for col in xrange(self.WIDTH):
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pixel = image.getpixel((col, line))
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freq_pixel = byte_to_freq(sum(pixel) / len(pixel))
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yield freq_pixel, msec_pixel
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class Robot8BW(GrayscaleSSTV):
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VIS_CODE = 0x02
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WIDTH = 160
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HEIGHT = 120
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SYNC = 7
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SCAN = 60
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class Robot24BW(GrayscaleSSTV):
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VIS_CODE = 0x0A
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WIDTH = 320
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HEIGHT = 240
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SYNC = 12
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SCAN = 93
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MODES = (Robot8BW, Robot24BW)
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