Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

third_party/aom/av1/common/clpf.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include "./clpf.h"
+#include "./av1_rtcd.h"
+#include "./cdef.h"
+#include "aom/aom_image.h"
+#include "aom_dsp/aom_dsp_common.h"
+
+int av1_clpf_sample(int X, int A, int B, int C, int D, int E, int F, int G,
+                    int H, int s, unsigned int dmp) {
+  int delta = 1 * constrain(A - X, s, dmp) + 3 * constrain(B - X, s, dmp) +
+              1 * constrain(C - X, s, dmp) + 3 * constrain(D - X, s, dmp) +
+              3 * constrain(E - X, s, dmp) + 1 * constrain(F - X, s, dmp) +
+              3 * constrain(G - X, s, dmp) + 1 * constrain(H - X, s, dmp);
+  return (8 + delta - (delta < 0)) >> 4;
+}
+
+int av1_clpf_hsample(int X, int A, int B, int C, int D, int s,
+                     unsigned int dmp) {
+  int delta = 1 * constrain(A - X, s, dmp) + 3 * constrain(B - X, s, dmp) +
+              3 * constrain(C - X, s, dmp) + 1 * constrain(D - X, s, dmp);
+  return (4 + delta - (delta < 0)) >> 3;
+}
+
+void aom_clpf_block_c(uint8_t *dst, const uint16_t *src, int dstride,
+                      int sstride, int sizex, int sizey, unsigned int strength,
+                      unsigned int damping) {
+  int x, y;
+
+  for (y = 0; y < sizey; y++) {
+    for (x = 0; x < sizex; x++) {
+      const int X = src[y * sstride + x];
+      const int A = src[(y - 2) * sstride + x];
+      const int B = src[(y - 1) * sstride + x];
+      const int C = src[y * sstride + x - 2];
+      const int D = src[y * sstride + x - 1];
+      const int E = src[y * sstride + x + 1];
+      const int F = src[y * sstride + x + 2];
+      const int G = src[(y + 1) * sstride + x];
+      const int H = src[(y + 2) * sstride + x];
+      const int delta =
+          av1_clpf_sample(X, A, B, C, D, E, F, G, H, strength, damping);
+      dst[y * dstride + x] = X + delta;
+    }
+  }
+}
+
+// Identical to aom_clpf_block_c() apart from "dst".
+void aom_clpf_block_hbd_c(uint16_t *dst, const uint16_t *src, int dstride,
+                          int sstride, int sizex, int sizey,
+                          unsigned int strength, unsigned int damping) {
+  int x, y;
+
+  for (y = 0; y < sizey; y++) {
+    for (x = 0; x < sizex; x++) {
+      const int X = src[y * sstride + x];
+      const int A = src[(y - 2) * sstride + x];
+      const int B = src[(y - 1) * sstride + x];
+      const int C = src[y * sstride + x - 2];
+      const int D = src[y * sstride + x - 1];
+      const int E = src[y * sstride + x + 1];
+      const int F = src[y * sstride + x + 2];
+      const int G = src[(y + 1) * sstride + x];
+      const int H = src[(y + 2) * sstride + x];
+      const int delta =
+          av1_clpf_sample(X, A, B, C, D, E, F, G, H, strength, damping);
+      dst[y * dstride + x] = X + delta;
+    }
+  }
+}
+
+// Vertically restricted filter
+void aom_clpf_hblock_c(uint8_t *dst, const uint16_t *src, int dstride,
+                       int sstride, int sizex, int sizey, unsigned int strength,
+                       unsigned int damping) {
+  int x, y;
+
+  for (y = 0; y < sizey; y++) {
+    for (x = 0; x < sizex; x++) {
+      const int X = src[y * sstride + x];
+      const int A = src[y * sstride + x - 2];
+      const int B = src[y * sstride + x - 1];
+      const int C = src[y * sstride + x + 1];
+      const int D = src[y * sstride + x + 2];
+      const int delta = av1_clpf_hsample(X, A, B, C, D, strength, damping);
+      dst[y * dstride + x] = X + delta;
+    }
+  }
+}
+
+void aom_clpf_hblock_hbd_c(uint16_t *dst, const uint16_t *src, int dstride,
+                           int sstride, int sizex, int sizey,
+                           unsigned int strength, unsigned int damping) {
+  int x, y;
+
+  for (y = 0; y < sizey; y++) {
+    for (x = 0; x < sizex; x++) {
+      const int X = src[y * sstride + x];
+      const int A = src[y * sstride + x - 2];
+      const int B = src[y * sstride + x - 1];
+      const int C = src[y * sstride + x + 1];
+      const int D = src[y * sstride + x + 2];
+      const int delta = av1_clpf_hsample(X, A, B, C, D, strength, damping);
+      dst[y * dstride + x] = X + delta;
+    }
+  }
+}