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, 72 insertions, 0 deletions

diff --git a/third_party/aom/av1/common/scale.h b/third_party/aom/av1/common/scale.h
new file mode 100644
index 000000000..ea81efab0
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+++ b/third_party/aom/av1/common/scale.h
@@ -0,0 +1,72 @@
+/*
+ * 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_SCALE_H_
+#define AV1_COMMON_SCALE_H_
+
+#include "av1/common/mv.h"
+#include "aom_dsp/aom_convolve.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define REF_SCALE_SHIFT 14
+#define REF_NO_SCALE (1 << REF_SCALE_SHIFT)
+#define REF_INVALID_SCALE -1
+
+struct scale_factors {
+  int x_scale_fp;  // horizontal fixed point scale factor
+  int y_scale_fp;  // vertical fixed point scale factor
+  int x_step_q4;
+  int y_step_q4;
+
+  int (*scale_value_x)(int val, const struct scale_factors *sf);
+  int (*scale_value_y)(int val, const struct scale_factors *sf);
+
+  convolve_fn_t predict[2][2][2];  // horiz, vert, avg
+#if CONFIG_HIGHBITDEPTH
+  highbd_convolve_fn_t highbd_predict[2][2][2];  // horiz, vert, avg
+#endif                                           // CONFIG_HIGHBITDEPTH
+};
+
+MV32 av1_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf);
+
+#if CONFIG_HIGHBITDEPTH
+void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
+                                       int other_h, int this_w, int this_h,
+                                       int use_high);
+#else
+void av1_setup_scale_factors_for_frame(struct scale_factors *sf, int other_w,
+                                       int other_h, int this_w, int this_h);
+#endif  // CONFIG_HIGHBITDEPTH
+
+static INLINE int av1_is_valid_scale(const struct scale_factors *sf) {
+  return sf->x_scale_fp != REF_INVALID_SCALE &&
+         sf->y_scale_fp != REF_INVALID_SCALE;
+}
+
+static INLINE int av1_is_scaled(const struct scale_factors *sf) {
+  return av1_is_valid_scale(sf) &&
+         (sf->x_scale_fp != REF_NO_SCALE || sf->y_scale_fp != REF_NO_SCALE);
+}
+
+static INLINE int valid_ref_frame_size(int ref_width, int ref_height,
+                                       int this_width, int this_height) {
+  return 2 * this_width >= ref_width && 2 * this_height >= ref_height &&
+         this_width <= 16 * ref_width && this_height <= 16 * ref_height;
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AV1_COMMON_SCALE_H_