+ self.lastframe.as_ref().cloned()
+ }
+ pub fn get_golden(&mut self) -> Option<NAVideoBufferRef<u8>> {
+ self.goldframe.as_ref().cloned()
+ }
+ pub fn has_refs(&self) -> bool {
+ self.lastframe.is_some()
+ }
+}
+
+pub const VP56_COEF_BASE: [i16; 6] = [ 5, 7, 11, 19, 35, 67 ];
+pub const VP56_COEF_ADD_PROBS: [[u8; 12]; 6] = [
+ [ 159, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ],
+ [ 165, 145, 128, 0, 0, 0, 0, 0, 0, 0, 0, 0 ],
+ [ 173, 148, 140, 128, 0, 0, 0, 0, 0, 0, 0, 0 ],
+ [ 176, 155, 140, 135, 128, 0, 0, 0, 0, 0, 0, 0 ],
+ [ 180, 157, 141, 134, 130, 128, 0, 0, 0, 0, 0, 0 ],
+ [ 254, 254, 243, 230, 196, 177, 153, 140, 133, 130, 129, 128 ],
+];
+
+#[allow(dead_code)]
+pub struct BoolCoder<'a> {
+ pub src: &'a [u8],
+ pos: usize,
+ value: u32,
+ range: u32,
+ bits: i32,
+}
+
+#[allow(dead_code)]
+impl<'a> BoolCoder<'a> {
+ pub fn new(src: &'a [u8]) -> DecoderResult<Self> {
+ if src.len() < 3 { return Err(DecoderError::ShortData); }
+ let value = (u32::from(src[0]) << 24) | (u32::from(src[1]) << 16) | (u32::from(src[2]) << 8) | u32::from(src[3]);
+ Ok(Self { src, pos: 4, value, range: 255, bits: 8 })
+ }
+ pub fn read_bool(&mut self) -> bool {
+ self.read_prob(128)
+ }
+ pub fn read_prob(&mut self, prob: u8) -> bool {
+ self.renorm();
+ let split = 1 + (((self.range - 1) * u32::from(prob)) >> 8);
+ let bit;
+ if self.value < (split << 24) {
+ self.range = split;
+ bit = false;