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use enum for colors

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This commit is contained in:
András Veres-Szentkirályi 2014-06-07 11:53:19 +02:00
parent 7fde5671dc
commit eaa8cd4dca
1 changed files with 20 additions and 16 deletions
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36
pysstv/color.py
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@ -4,9 +4,13 @@ from __future__ import division
from pysstv.sstv import byte_to_freq, FREQ_BLACK, FREQ_WHITE, FREQ_VIS_START
from pysstv.grayscale import GrayscaleSSTV
from itertools import chain
from enum import Enum
RED, GREEN, BLUE = range(3)
class Color(Enum):
red = 0
green = 1
blue = 2
class ColorSSTV(GrayscaleSSTV):
def on_init(self):
@ -15,22 +19,22 @@ class ColorSSTV(GrayscaleSSTV):
def encode_line(self, line):
msec_pixel = self.SCAN / self.WIDTH
image = self.pixels
for index in self.COLOR_SEQ:
yield from self.before_channel(index)
for color in self.COLOR_SEQ:
yield from self.before_channel(color)
for col in range(self.WIDTH):
pixel = image[col, line]
freq_pixel = byte_to_freq(pixel[index])
freq_pixel = byte_to_freq(pixel[color.value])
yield freq_pixel, msec_pixel
yield from self.after_channel(index)
yield from self.after_channel(color)
def before_channel(self, index):
def before_channel(self, color):
return []
after_channel = before_channel
class MartinM1(ColorSSTV):
COLOR_SEQ = (GREEN, BLUE, RED)
COLOR_SEQ = (Color.green, Color.blue, Color.red)
VIS_CODE = 0x2c
WIDTH = 320
HEIGHT = 256
@ -38,11 +42,11 @@ class MartinM1(ColorSSTV):
SCAN = 146.432
INTER_CH_GAP = 0.572
def before_channel(self, index):
if index == GREEN:
def before_channel(self, color):
if color is Color.green:
yield FREQ_BLACK, self.INTER_CH_GAP
def after_channel(self, index):
def after_channel(self, color):
yield FREQ_BLACK, self.INTER_CH_GAP
@ -61,8 +65,8 @@ class ScottieS1(MartinM1):
def horizontal_sync(self):
return []
def before_channel(self, index):
if index == RED:
def before_channel(self, color):
if color is Color.red:
yield from MartinM1.horizontal_sync(self)
yield FREQ_BLACK, self.INTER_CH_GAP
@ -114,7 +118,7 @@ class PasokonP3(ColorSSTV):
Horizontal Sync - 25 time units of 1200 Hz.
"""
TIMEUNIT = 1000/4800. # ms
COLOR_SEQ = (RED, GREEN, BLUE)
COLOR_SEQ = (Color.red, Color.green, Color.blue)
VIS_CODE = 0x71
WIDTH = 640
HEIGHT = 480+16
@ -122,11 +126,11 @@ class PasokonP3(ColorSSTV):
SCAN = WIDTH * TIMEUNIT
INTER_CH_GAP = 5 * TIMEUNIT
def before_channel(self, index):
if index == self.COLOR_SEQ[0]:
def before_channel(self, color):
if color is Color.red:
yield FREQ_BLACK, self.INTER_CH_GAP
def after_channel(self, index):
def after_channel(self, color):
yield FREQ_BLACK, self.INTER_CH_GAP