Import aom library

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

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 27 insertions, 0 deletions

diff --git a/third_party/aom/av1/common/cdef_simd.h b/third_party/aom/av1/common/cdef_simd.h
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+/*
+ * 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.
+ */
+#ifndef AV1_COMMON_CDEF_SIMD_H_
+#define AV1_COMMON_CDEF_SIMD_H_
+
+#include "aom_dsp/aom_simd.h"
+
+// sign(a-b) * min(abs(a-b), max(0, threshold - (abs(a-b) >> adjdamp)))
+SIMD_INLINE v128 constrain16(v128 a, v128 b, unsigned int threshold,
+                             unsigned int adjdamp) {
+  v128 diff = v128_sub_16(a, b);
+  const v128 sign = v128_shr_n_s16(diff, 15);
+  diff = v128_abs_s16(diff);
+  const v128 s =
+      v128_ssub_u16(v128_dup_16(threshold), v128_shr_u16(diff, adjdamp));
+  return v128_xor(v128_add_16(sign, v128_min_s16(diff, s)), sign);
+}
+
+#endif  // AV1_COMMON_CDEF_SIMD_H_