Function decodeBit [src]

Prototype

pub inline fn decodeBit(self: *RangeDecoder, reader: anytype, prob: *u16, update: bool) !bool

Parameters

self: *RangeDecoderprob: *u16update: bool

Source

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

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

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

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