rangecoder

https://github.com/lucastheis/rangecoder

https://github.com/lucastheis/rangecoder/blob/master/python/tests/test_range_coder.py

cumFreq0 = [0, 4, 5, 6] //表示累记频率。
sequence = [0, 0, 0, 0, 1, 2]
encoder.encode(data0, sequence )