+ 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;
+ } else {
+ self.range -= split;
+ self.value -= split << 24;
+ bit = true;
+ }
+ bit
+ }
+ pub fn read_bits(&mut self, bits: u8) -> u32 {
+ let mut val = 0u32;
+ for _ in 0..bits {
+ val = (val << 1) | (self.read_prob(128) as u32);
+ }
+ val
+ }
+ pub fn read_byte(&mut self) -> u8 {
+ let mut val = 0u8;
+ for _ in 0..8 {
+ val = (val << 1) | (self.read_prob(128) as u8);
+ }
+ val
+ }
+ pub fn read_sbits(&mut self, bits: u8) -> i32 {
+ let mut val = if self.read_prob(128) { -1i32 } else { 0i32 };
+ for _ in 1..bits {
+ val = (val << 1) | (self.read_prob(128) as i32);
+ }
+ val
+ }
+ pub fn read_probability(&mut self) -> u8 {
+ let val = self.read_bits(7) as u8;
+ if val == 0 {
+ 1
+ } else {
+ val << 1
+ }
+ }
+ fn renorm(&mut self) {
+ let shift = self.range.leading_zeros() & 7;
+ self.range <<= shift;
+ self.value <<= shift;
+ self.bits -= shift as i32;
+ if (self.bits <= 0) && (self.pos < self.src.len()) {
+ self.value |= u32::from(self.src[self.pos]) << (-self.bits as u8);
+ self.pos += 1;
+ self.bits += 8;
+ }
+/* while self.range < 0x80 {
+ self.range <<= 1;
+ self.value <<= 1;
+ self.bits -= 1;
+ if (self.bits <= 0) && (self.pos < self.src.len()) {
+ self.value |= u32::from(self.src[self.pos]);
+ self.pos += 1;
+ self.bits = 8;
+ }
+ }*/
+ }
+ pub fn skip_bytes(&mut self, nbytes: usize) {
+ for _ in 0..nbytes {
+ self.value <<= 8;
+ if self.pos < self.src.len() {
+ self.value |= u32::from(self.src[self.pos]);
+ self.pos += 1;
+ }
+ }
+ }
+}
+
+#[allow(dead_code)]
+#[allow(clippy::trivially_copy_pass_by_ref)]
+pub fn rescale_prob(prob: u8, weights: &[i16; 2], maxval: i32) -> u8 {
+ (((i32::from(prob) * i32::from(weights[0]) + 128) >> 8) + i32::from(weights[1])).min(maxval).max(1) as u8
+}
+
+macro_rules! vp_tree {
+ ($bc: expr, $prob: expr, $node1: expr, $node2: expr) => {
+ if !$bc.read_prob($prob) {
+ $node1
+ } else {
+ $node2
+ }
+ };
+ ($leaf: expr) => { $leaf }