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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 AOM_AV1_COMMON_MV_H_
+#define AOM_AV1_COMMON_MV_H_
+
+#include "av1/common/common.h"
+#include "av1/common/common_data.h"
+#include "aom_dsp/aom_filter.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define INVALID_MV 0x80008000
+
+typedef struct mv {
+ int16_t row;
+ int16_t col;
+} MV;
+
+static const MV kZeroMv = { 0, 0 };
+
+typedef union int_mv {
+ uint32_t as_int;
+ MV as_mv;
+} int_mv; /* facilitates faster equality tests and copies */
+
+typedef struct mv32 {
+ int32_t row;
+ int32_t col;
+} MV32;
+
+// Bits of precision used for the model
+#define WARPEDMODEL_PREC_BITS 16
+#define WARPEDMODEL_ROW3HOMO_PREC_BITS 16
+
+#define WARPEDMODEL_TRANS_CLAMP (128 << WARPEDMODEL_PREC_BITS)
+#define WARPEDMODEL_NONDIAGAFFINE_CLAMP (1 << (WARPEDMODEL_PREC_BITS - 3))
+#define WARPEDMODEL_ROW3HOMO_CLAMP (1 << (WARPEDMODEL_PREC_BITS - 2))
+
+// Bits of subpel precision for warped interpolation
+#define WARPEDPIXEL_PREC_BITS 6
+#define WARPEDPIXEL_PREC_SHIFTS (1 << WARPEDPIXEL_PREC_BITS)
+
+#define WARP_PARAM_REDUCE_BITS 6
+
+#define WARPEDDIFF_PREC_BITS (WARPEDMODEL_PREC_BITS - WARPEDPIXEL_PREC_BITS)
+
+/* clang-format off */
+typedef enum ATTRIBUTE_PACKED {
+ IDENTITY = 0, // identity transformation, 0-parameter
+ TRANSLATION = 1, // translational motion 2-parameter
+ ROTZOOM = 2, // simplified affine with rotation + zoom only, 4-parameter
+ AFFINE = 3, // affine, 6-parameter
+ TRANS_TYPES,
+} TransformationType;
+/* clang-format on */
+
+// Number of types used for global motion (must be >= 3 and <= TRANS_TYPES)
+// The following can be useful:
+// GLOBAL_TRANS_TYPES 3 - up to rotation-zoom
+// GLOBAL_TRANS_TYPES 4 - up to affine
+// GLOBAL_TRANS_TYPES 6 - up to hor/ver trapezoids
+// GLOBAL_TRANS_TYPES 7 - up to full homography
+#define GLOBAL_TRANS_TYPES 4
+
+typedef struct {
+ int global_warp_allowed;
+ int local_warp_allowed;
+} WarpTypesAllowed;
+
+// number of parameters used by each transformation in TransformationTypes
+static const int trans_model_params[TRANS_TYPES] = { 0, 2, 4, 6 };
+
+// The order of values in the wmmat matrix below is best described
+// by the homography:
+// [x' (m2 m3 m0 [x
+// z . y' = m4 m5 m1 * y
+// 1] m6 m7 1) 1]
+typedef struct {
+ TransformationType wmtype;
+ int32_t wmmat[8];
+ int16_t alpha, beta, gamma, delta;
+ int8_t invalid;
+} WarpedMotionParams;
+
+/* clang-format off */
+static const WarpedMotionParams default_warp_params = {
+ IDENTITY,
+ { 0, 0, (1 << WARPEDMODEL_PREC_BITS), 0, 0, (1 << WARPEDMODEL_PREC_BITS), 0,
+ 0 },
+ 0, 0, 0, 0,
+ 0,
+};
+/* clang-format on */
+
+// The following constants describe the various precisions
+// of different parameters in the global motion experiment.
+//
+// Given the general homography:
+// [x' (a b c [x
+// z . y' = d e f * y
+// 1] g h i) 1]
+//
+// Constants using the name ALPHA here are related to parameters
+// a, b, d, e. Constants using the name TRANS are related
+// to parameters c and f.
+//
+// Anything ending in PREC_BITS is the number of bits of precision
+// to maintain when converting from double to integer.
+//
+// The ABS parameters are used to create an upper and lower bound
+// for each parameter. In other words, after a parameter is integerized
+// it is clamped between -(1 << ABS_XXX_BITS) and (1 << ABS_XXX_BITS).
+//
+// XXX_PREC_DIFF and XXX_DECODE_FACTOR
+// are computed once here to prevent repetitive
+// computation on the decoder side. These are
+// to allow the global motion parameters to be encoded in a lower
+// precision than the warped model precision. This means that they
+// need to be changed to warped precision when they are decoded.
+//
+// XX_MIN, XX_MAX are also computed to avoid repeated computation
+
+#define SUBEXPFIN_K 3
+#define GM_TRANS_PREC_BITS 6
+#define GM_ABS_TRANS_BITS 12
+#define GM_ABS_TRANS_ONLY_BITS (GM_ABS_TRANS_BITS - GM_TRANS_PREC_BITS + 3)
+#define GM_TRANS_PREC_DIFF (WARPEDMODEL_PREC_BITS - GM_TRANS_PREC_BITS)
+#define GM_TRANS_ONLY_PREC_DIFF (WARPEDMODEL_PREC_BITS - 3)
+#define GM_TRANS_DECODE_FACTOR (1 << GM_TRANS_PREC_DIFF)
+#define GM_TRANS_ONLY_DECODE_FACTOR (1 << GM_TRANS_ONLY_PREC_DIFF)
+
+#define GM_ALPHA_PREC_BITS 15
+#define GM_ABS_ALPHA_BITS 12
+#define GM_ALPHA_PREC_DIFF (WARPEDMODEL_PREC_BITS - GM_ALPHA_PREC_BITS)
+#define GM_ALPHA_DECODE_FACTOR (1 << GM_ALPHA_PREC_DIFF)
+
+#define GM_ROW3HOMO_PREC_BITS 16
+#define GM_ABS_ROW3HOMO_BITS 11
+#define GM_ROW3HOMO_PREC_DIFF \
+ (WARPEDMODEL_ROW3HOMO_PREC_BITS - GM_ROW3HOMO_PREC_BITS)
+#define GM_ROW3HOMO_DECODE_FACTOR (1 << GM_ROW3HOMO_PREC_DIFF)
+
+#define GM_TRANS_MAX (1 << GM_ABS_TRANS_BITS)
+#define GM_ALPHA_MAX (1 << GM_ABS_ALPHA_BITS)
+#define GM_ROW3HOMO_MAX (1 << GM_ABS_ROW3HOMO_BITS)
+
+#define GM_TRANS_MIN -GM_TRANS_MAX
+#define GM_ALPHA_MIN -GM_ALPHA_MAX
+#define GM_ROW3HOMO_MIN -GM_ROW3HOMO_MAX
+
+static INLINE int block_center_x(int mi_col, BLOCK_SIZE bs) {
+ const int bw = block_size_wide[bs];
+ return mi_col * MI_SIZE + bw / 2 - 1;
+}
+
+static INLINE int block_center_y(int mi_row, BLOCK_SIZE bs) {
+ const int bh = block_size_high[bs];
+ return mi_row * MI_SIZE + bh / 2 - 1;
+}
+
+static INLINE int convert_to_trans_prec(int allow_hp, int coor) {
+ if (allow_hp)
+ return ROUND_POWER_OF_TWO_SIGNED(coor, WARPEDMODEL_PREC_BITS - 3);
+ else
+ return ROUND_POWER_OF_TWO_SIGNED(coor, WARPEDMODEL_PREC_BITS - 2) * 2;
+}
+static INLINE void integer_mv_precision(MV *mv) {
+ int mod = (mv->row % 8);
+ if (mod != 0) {
+ mv->row -= mod;
+ if (abs(mod) > 4) {
+ if (mod > 0) {
+ mv->row += 8;
+ } else {
+ mv->row -= 8;
+ }
+ }
+ }
+
+ mod = (mv->col % 8);
+ if (mod != 0) {
+ mv->col -= mod;
+ if (abs(mod) > 4) {
+ if (mod > 0) {
+ mv->col += 8;
+ } else {
+ mv->col -= 8;
+ }
+ }
+ }
+}
+// Convert a global motion vector into a motion vector at the centre of the
+// given block.
+//
+// The resulting motion vector will have three fractional bits of precision. If
+// allow_hp is zero, the bottom bit will always be zero. If CONFIG_AMVR and
+// is_integer is true, the bottom three bits will be zero (so the motion vector
+// represents an integer)
+static INLINE int_mv gm_get_motion_vector(const WarpedMotionParams *gm,
+ int allow_hp, BLOCK_SIZE bsize,
+ int mi_col, int mi_row,
+ int is_integer) {
+ int_mv res;
+
+ if (gm->wmtype == IDENTITY) {
+ res.as_int = 0;
+ return res;
+ }
+
+ const int32_t *mat = gm->wmmat;
+ int x, y, tx, ty;
+
+ if (gm->wmtype == TRANSLATION) {
+ // All global motion vectors are stored with WARPEDMODEL_PREC_BITS (16)
+ // bits of fractional precision. The offset for a translation is stored in
+ // entries 0 and 1. For translations, all but the top three (two if
+ // cm->allow_high_precision_mv is false) fractional bits are always zero.
+ //
+ // After the right shifts, there are 3 fractional bits of precision. If
+ // allow_hp is false, the bottom bit is always zero (so we don't need a
+ // call to convert_to_trans_prec here)
+ res.as_mv.row = gm->wmmat[0] >> GM_TRANS_ONLY_PREC_DIFF;
+ res.as_mv.col = gm->wmmat[1] >> GM_TRANS_ONLY_PREC_DIFF;
+ assert(IMPLIES(1 & (res.as_mv.row | res.as_mv.col), allow_hp));
+ if (is_integer) {
+ integer_mv_precision(&res.as_mv);
+ }
+ return res;
+ }
+
+ x = block_center_x(mi_col, bsize);
+ y = block_center_y(mi_row, bsize);
+
+ if (gm->wmtype == ROTZOOM) {
+ assert(gm->wmmat[5] == gm->wmmat[2]);
+ assert(gm->wmmat[4] == -gm->wmmat[3]);
+ }
+
+ const int xc =
+ (mat[2] - (1 << WARPEDMODEL_PREC_BITS)) * x + mat[3] * y + mat[0];
+ const int yc =
+ mat[4] * x + (mat[5] - (1 << WARPEDMODEL_PREC_BITS)) * y + mat[1];
+ tx = convert_to_trans_prec(allow_hp, xc);
+ ty = convert_to_trans_prec(allow_hp, yc);
+
+ res.as_mv.row = ty;
+ res.as_mv.col = tx;
+
+ if (is_integer) {
+ integer_mv_precision(&res.as_mv);
+ }
+ return res;
+}
+
+static INLINE TransformationType get_gmtype(const WarpedMotionParams *gm) {
+ if (gm->wmmat[5] == (1 << WARPEDMODEL_PREC_BITS) && !gm->wmmat[4] &&
+ gm->wmmat[2] == (1 << WARPEDMODEL_PREC_BITS) && !gm->wmmat[3]) {
+ return ((!gm->wmmat[1] && !gm->wmmat[0]) ? IDENTITY : TRANSLATION);
+ }
+ if (gm->wmmat[2] == gm->wmmat[5] && gm->wmmat[3] == -gm->wmmat[4])
+ return ROTZOOM;
+ else
+ return AFFINE;
+}
+
+typedef struct candidate_mv {
+ int_mv this_mv;
+ int_mv comp_mv;
+ int weight;
+} CANDIDATE_MV;
+
+static INLINE int is_zero_mv(const MV *mv) {
+ return *((const uint32_t *)mv) == 0;
+}
+
+static INLINE int is_equal_mv(const MV *a, const MV *b) {
+ return *((const uint32_t *)a) == *((const uint32_t *)b);
+}
+
+static INLINE void clamp_mv(MV *mv, int min_col, int max_col, int min_row,
+ int max_row) {
+ mv->col = clamp(mv->col, min_col, max_col);
+ mv->row = clamp(mv->row, min_row, max_row);
+}
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_COMMON_MV_H_
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