RealVideo 4 encoder

[nihav.git] / nihav-realmedia / src / codecs / rv40enc / dsp / mod.rs

diff --git a/nihav-realmedia/src/codecs/rv40enc/dsp/mod.rs b/nihav-realmedia/src/codecs/rv40enc/dsp/mod.rs
new file mode 100644 (file)
index 0000000..bcb7e25
--- /dev/null
+++ b/nihav-realmedia/src/codecs/rv40enc/dsp/mod.rs
@@ -0,0 +1,110 @@
+use super::types::Block;
+
+mod blk;
+pub use blk::*;
+mod ipred;
+pub use ipred::*;
+mod loopfilt;
+pub use loopfilt::*;
+mod mc;
+pub use mc::*;
+
+fn clip8(a: i16) -> u8 {
+    if a < 0 { 0 }
+    else if a > 255 { 255 }
+    else { a as u8 }
+}
+
+pub struct RefMBData {
+    pub y:  [u8; 16 * 16],
+    pub u:  [u8; 8 * 8],
+    pub v:  [u8; 8 * 8],
+}
+
+impl RefMBData {
+    pub fn new() -> Self {
+        Self {
+            y:  [0; 16 * 16],
+            u:  [0; 8 * 8],
+            v:  [0; 8 * 8],
+        }
+    }
+    pub fn copy_from(&mut self, other: &Self) {
+        self.y.copy_from_slice(&other.y);
+        self.u.copy_from_slice(&other.u);
+        self.v.copy_from_slice(&other.v);
+    }
+    pub fn calc_coeffs(&self, new: &Self, coeffs: &mut [Block; 25], q_dc: usize, q_ac: usize, is16: bool) {
+        let (blocks, dcs) = coeffs.split_at_mut(24);
+        let mut dblocks = blocks.iter_mut();
+        let dcs = &mut dcs[0];
+        for (y, (dstripe, sstripe)) in self.y.chunks(16 * 4).zip(new.y.chunks(16 * 4)).enumerate() {
+            for x in (0..16).step_by(4) {
+                let dst = dblocks.next().unwrap();
+                Self::diff_blk(&sstripe[x..], &dstripe[x..], 16, dst);
+                dst.transform_4x4();
+                if is16 {
+                    dcs.coeffs[x / 4 + y * 4] = dst.coeffs[0];
+                    dst.coeffs[0] = 0;
+                }
+                dst.quant(q_ac, q_ac);
+            }
+        }
+        let (cq_dc, cq_ac) = chroma_quants(q_ac);
+        for (dstripe, sstripe) in self.u.chunks(8 * 4).zip(new.u.chunks(8 * 4)) {
+            for x in (0..8).step_by(4) {
+                let dst = dblocks.next().unwrap();
+                Self::diff_blk(&sstripe[x..], &dstripe[x..], 8, dst);
+                dst.transform_4x4();
+                dst.quant(cq_dc, cq_ac);
+            }
+        }
+        for (dstripe, sstripe) in self.v.chunks(8 * 4).zip(new.v.chunks(8 * 4)) {
+            for x in (0..8).step_by(4) {
+                let dst = dblocks.next().unwrap();
+                Self::diff_blk(&sstripe[x..], &dstripe[x..], 8, dst);
+                dst.transform_4x4();
+                dst.quant(cq_dc, cq_ac);
+            }
+        }
+        if is16 {
+            coeffs[24].transform_dcs();
+            coeffs[24].quant_dcs(q_dc, q_ac);
+        }
+    }
+    fn diff_blk(src: &[u8], new: &[u8], stride: usize, dst: &mut Block) {
+        for (drow, (sline, nline)) in dst.coeffs.chunks_mut(4).zip(src.chunks(stride).zip(new.chunks(stride))) {
+            for (dst, (&a, &b)) in drow.iter_mut().zip(sline.iter().zip(nline.iter())) {
+                *dst = i16::from(a) - i16::from(b);
+            }
+        }
+    }
+    pub fn avg(&mut self, ref1: &Self, weight1: u32, ref2: &Self, weight2: u32) {
+        for (dst, (&src1, &src2)) in self.y.iter_mut().zip(ref1.y.iter().zip(ref2.y.iter())) {
+            *dst = weight(src1, weight1, src2, weight2);
+        }
+        for (dst, (&src1, &src2)) in self.u.iter_mut().zip(ref1.u.iter().zip(ref2.u.iter())) {
+            *dst = weight(src1, weight1, src2, weight2);
+        }
+        for (dst, (&src1, &src2)) in self.v.iter_mut().zip(ref1.v.iter().zip(ref2.v.iter())) {
+            *dst = weight(src1, weight1, src2, weight2);
+        }
+    }
+}
+
+fn weight(pix1: u8, weight1: u32, pix2: u8, weight2: u32) -> u8 {
+    ((((u32::from(pix1) * weight1) >> 9) + ((u32::from(pix2) * weight2) >> 9) + 0x10) >> 5) as u8
+}
+
+pub fn chroma_quants(q: usize) -> (usize, usize) {
+    (RV34_CHROMA_QUANT_DC[q].into(), RV34_CHROMA_QUANT_AC[q].into())
+}
+
+const RV34_CHROMA_QUANT_DC: [u8; 32] = [
+     0,  0,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13,
+    14, 15, 15, 16, 17, 18, 18, 19, 20, 20, 21, 21, 22, 22, 23, 23
+];
+const RV34_CHROMA_QUANT_AC: [u8; 32] = [
+     0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
+    16, 17, 17, 18, 19, 20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 25
+];