def test_scc_word_to_text(self):
scc_word = SccWord.from_value(0x1234)
self.assertEqual('\x12\x34', scc_word.to_text())
scc_word = SccWord.from_value(0x01)
self.assertEqual('\x01', scc_word.to_text())
self.assertRaises(ValueError, SccWord.from_value, 0x01020304)
def test_scc_word_from_str(self):
scc_word = SccWord.from_str("0000")
self.assertEqual((0x00, 0x00, 0x0000),
(scc_word.byte_1, scc_word.byte_2, scc_word.value))
scc_word = SccWord.from_str("1a2b")
self.assertEqual((0x1a, 0x2b, 0x1a2b),
(scc_word.byte_1, scc_word.byte_2, scc_word.value))
scc_word = SccWord.from_str("ffff")
self.assertEqual((0x7f, 0x7f, 0x7f7f),
(scc_word.byte_1, scc_word.byte_2, scc_word.value))
self.assertRaises(ValueError, SccWord.from_str, "ttml")
self.assertRaises(ValueError, SccWord.from_str, "Hello")
def test_scc_word_from_bytes(self):
scc_word = SccWord.from_bytes(0x00, 0x00)
self.assertEqual((0x00, 0x00, 0x0000),
(scc_word.byte_1, scc_word.byte_2, scc_word.value))
scc_word = SccWord.from_bytes(0x1a, 0x2b)
self.assertEqual((0x1a, 0x2b, 0x1a2b),
(scc_word.byte_1, scc_word.byte_2, scc_word.value))
scc_word = SccWord.from_bytes(0xff, 0xff)
self.assertEqual((0x7f, 0x7f, 0x7f7f),
(scc_word.byte_1, scc_word.byte_2, scc_word.value))
self.assertRaises(ValueError, SccWord.from_bytes, 0x123, 0x45)
self.assertRaises(ValueError, SccWord.from_bytes, 0x12, 0x345)
def test_scc_word_decipher_parity_bit(self):
self.assertEqual(0b00000000, SccWord._decipher_parity_bit(0b10000000))
self.assertEqual(0b00000010, SccWord._decipher_parity_bit(0b00000010))
self.assertEqual(0b00001010, SccWord._decipher_parity_bit(0b10001010))
translated_values = [
0x80, 0x01, 0x02, 0x83, 0x04, 0x85, 0x86, 0x07, 0x08, 0x89, 0x8a,
0x0b, 0x8c, 0x0d, 0x0e, 0x8f, 0x10, 0x91, 0x92, 0x13, 0x94, 0x15,
0x16, 0x97, 0x98, 0x19, 0x1a, 0x9b, 0x1c, 0x9d, 0x9e, 0x1f, 0x20,
0xa1, 0xa2, 0x23, 0xa4, 0x25, 0x26, 0xa7, 0xa8, 0x29, 0x2a, 0xab,
0x2c, 0xad, 0xae, 0x2f, 0xb0, 0x31, 0x32, 0xb3, 0x34, 0xb5, 0xb6,
0x37, 0x38, 0xb9, 0xba, 0x3b, 0xbc, 0x3d, 0x3e, 0xbf, 0x40, 0xc1,
0xc2, 0x43, 0xc4, 0x45, 0x46, 0xc7, 0xc8, 0x49, 0x4a, 0xcb, 0x4c,
0xcd, 0xce, 0x4f, 0xd0, 0x51, 0x52, 0xd3, 0x54, 0xd5, 0xd6, 0x57,
0x58, 0xd9, 0xda, 0x5b, 0xdc, 0x5d, 0x5e, 0xdf, 0xe0, 0x61, 0x62,
0xe3, 0x64, 0xe5, 0xe6, 0x67, 0x68, 0xe9, 0xea, 0x6b, 0xec, 0x6d,
0x6e, 0xef, 0x70, 0xf1, 0xf2, 0x73, 0xf4, 0x75, 0x76, 0xf7, 0xf8,
0x79, 0x7a, 0xfb, 0x7c, 0xfd, 0xfe, 0x7f
]
for i in range(0x00, 0x80):
self.assertEqual(
i, SccWord._decipher_parity_bit(translated_values[i]))
def from_str(line: str) -> Optional[SccLine]:
"""Creates a SCC line instance from the specified string"""
if not line:
return None
regex = re.compile(SCC_LINE_PATTERN)
match = regex.match(line)
if match is None:
return None
time_code = match.group(1)
time_offset = SmpteTimeCode.parse(time_code, FPS_30)
hex_words = line.split('\t')[1].split(' ')
scc_words = [SccWord.from_str(hex_word) for hex_word in hex_words if hex_word]
return SccLine(time_offset, scc_words)
def test_scc_word_is_hex_word(self):
self.assertTrue(SccWord._is_hex_word("0000"))
self.assertTrue(SccWord._is_hex_word("FFFF"))
self.assertFalse(SccWord._is_hex_word("000"))
self.assertFalse(SccWord._is_hex_word("12345"))
self.assertFalse(SccWord._is_hex_word("GHIJ"))