Function decodeBit [src]

Prototype

pub fn decodeBit(self: *RangeDecoder, reader: *Reader, prob: *u16, n_read: *u64) !bool

Parameters

self: *RangeDecoderreader: *Readerprob: *u16n_read: *u64

Source

  pub fn decodeBit(self: *RangeDecoder, reader: *Reader, prob: *u16, n_read: *u64) !bool {
    const bound = (self.range >> 11) * prob.*;

    if (self.code < bound) {
        prob.* += (0x800 - prob.*) >> 5;
        self.range = bound;

        try self.normalize(reader, n_read);
        return false;
    } else {
        prob.* -= prob.* >> 5;
        self.code -= bound;
        self.range -= bound;

        try self.normalize(reader, n_read);
        return true;
    }
}  