11184aebb761cbeac9124c37189a80a1a58f04b6bhkuang/* 21184aebb761cbeac9124c37189a80a1a58f04b6bhkuang * Copyright (c) 2013 The WebM project authors. All Rights Reserved. 31184aebb761cbeac9124c37189a80a1a58f04b6bhkuang * 41184aebb761cbeac9124c37189a80a1a58f04b6bhkuang * Use of this source code is governed by a BSD-style license 51184aebb761cbeac9124c37189a80a1a58f04b6bhkuang * that can be found in the LICENSE file in the root of the source 61184aebb761cbeac9124c37189a80a1a58f04b6bhkuang * tree. An additional intellectual property rights grant can be found 71184aebb761cbeac9124c37189a80a1a58f04b6bhkuang * in the file PATENTS. All contributing project authors may 81184aebb761cbeac9124c37189a80a1a58f04b6bhkuang * be found in the AUTHORS file in the root of the source tree. 91184aebb761cbeac9124c37189a80a1a58f04b6bhkuang */ 101184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 111184aebb761cbeac9124c37189a80a1a58f04b6bhkuang#include "./vp9_rtcd.h" 121184aebb761cbeac9124c37189a80a1a58f04b6bhkuang#include "vp9/common/vp9_filter.h" 131184aebb761cbeac9124c37189a80a1a58f04b6bhkuang#include "vp9/common/vp9_scale.h" 141184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 15b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanianstatic INLINE int scaled_x(int val, const struct scale_factors *sf) { 166ac915abcdb404a00d927fe6308a47fcf09d9519hkuang return (int)((int64_t)val * sf->x_scale_fp >> REF_SCALE_SHIFT); 171184aebb761cbeac9124c37189a80a1a58f04b6bhkuang} 181184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 19b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanianstatic INLINE int scaled_y(int val, const struct scale_factors *sf) { 206ac915abcdb404a00d927fe6308a47fcf09d9519hkuang return (int)((int64_t)val * sf->y_scale_fp >> REF_SCALE_SHIFT); 211184aebb761cbeac9124c37189a80a1a58f04b6bhkuang} 221184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 23b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanianstatic int unscaled_value(int val, const struct scale_factors *sf) { 24b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian (void) sf; 251184aebb761cbeac9124c37189a80a1a58f04b6bhkuang return val; 261184aebb761cbeac9124c37189a80a1a58f04b6bhkuang} 271184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 281184aebb761cbeac9124c37189a80a1a58f04b6bhkuangstatic int get_fixed_point_scale_factor(int other_size, int this_size) { 291184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // Calculate scaling factor once for each reference frame 301184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // and use fixed point scaling factors in decoding and encoding routines. 311184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // Hardware implementations can calculate scale factor in device driver 321184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // and use multiplication and shifting on hardware instead of division. 331184aebb761cbeac9124c37189a80a1a58f04b6bhkuang return (other_size << REF_SCALE_SHIFT) / this_size; 341184aebb761cbeac9124c37189a80a1a58f04b6bhkuang} 351184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 361184aebb761cbeac9124c37189a80a1a58f04b6bhkuangstatic int check_scale_factors(int other_w, int other_h, 371184aebb761cbeac9124c37189a80a1a58f04b6bhkuang int this_w, int this_h) { 381184aebb761cbeac9124c37189a80a1a58f04b6bhkuang return 2 * this_w >= other_w && 391184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 2 * this_h >= other_h && 401184aebb761cbeac9124c37189a80a1a58f04b6bhkuang this_w <= 16 * other_w && 411184aebb761cbeac9124c37189a80a1a58f04b6bhkuang this_h <= 16 * other_h; 421184aebb761cbeac9124c37189a80a1a58f04b6bhkuang} 431184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 44b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh VenkatasubramanianMV32 vp9_scale_mv(const MV *mv, int x, int y, const struct scale_factors *sf) { 45b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian const int x_off_q4 = scaled_x(x << SUBPEL_BITS, sf) & SUBPEL_MASK; 46b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian const int y_off_q4 = scaled_y(y << SUBPEL_BITS, sf) & SUBPEL_MASK; 47b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian const MV32 res = { 48b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian scaled_y(mv->row, sf) + y_off_q4, 49b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian scaled_x(mv->col, sf) + x_off_q4 50b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian }; 51b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian return res; 52b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian} 53b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian 54b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanianvoid vp9_setup_scale_factors_for_frame(struct scale_factors *sf, 551184aebb761cbeac9124c37189a80a1a58f04b6bhkuang int other_w, int other_h, 561184aebb761cbeac9124c37189a80a1a58f04b6bhkuang int this_w, int this_h) { 571184aebb761cbeac9124c37189a80a1a58f04b6bhkuang if (!check_scale_factors(other_w, other_h, this_w, this_h)) { 58b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->x_scale_fp = REF_INVALID_SCALE; 59b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->y_scale_fp = REF_INVALID_SCALE; 601184aebb761cbeac9124c37189a80a1a58f04b6bhkuang return; 611184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } 621184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 63b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->x_scale_fp = get_fixed_point_scale_factor(other_w, this_w); 64b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->y_scale_fp = get_fixed_point_scale_factor(other_h, this_h); 65b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->x_step_q4 = scaled_x(16, sf); 66b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->y_step_q4 = scaled_y(16, sf); 671184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 68b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian if (vp9_is_scaled(sf)) { 69b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->scale_value_x = scaled_x; 70b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->scale_value_y = scaled_y; 711184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } else { 72b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->scale_value_x = unscaled_value; 73b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->scale_value_y = unscaled_value; 741184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } 751184aebb761cbeac9124c37189a80a1a58f04b6bhkuang 761184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // TODO(agrange): Investigate the best choice of functions to use here 771184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // for EIGHTTAP_SMOOTH. Since it is not interpolating, need to choose what 781184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // to do at full-pel offsets. The current selection, where the filter is 791184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // applied in one direction only, and not at all for 0,0, seems to give the 801184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // best quality, but it may be worth trying an additional mode that does 811184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // do the filtering on full-pel. 82b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian if (sf->x_step_q4 == 16) { 83b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian if (sf->y_step_q4 == 16) { 841184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // No scaling in either direction. 85b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][0] = vp9_convolve_copy; 86b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][1] = vp9_convolve_avg; 87b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][0] = vp9_convolve8_vert; 88b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][1] = vp9_convolve8_avg_vert; 89b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][0] = vp9_convolve8_horiz; 90b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][1] = vp9_convolve8_avg_horiz; 911184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } else { 921184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // No scaling in x direction. Must always scale in the y direction. 93b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][0] = vp9_convolve8_vert; 94b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][1] = vp9_convolve8_avg_vert; 95b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][0] = vp9_convolve8_vert; 96b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][1] = vp9_convolve8_avg_vert; 97b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][0] = vp9_convolve8; 98b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][1] = vp9_convolve8_avg; 991184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } 1001184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } else { 101b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian if (sf->y_step_q4 == 16) { 1021184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // No scaling in the y direction. Must always scale in the x direction. 103b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][0] = vp9_convolve8_horiz; 104b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][1] = vp9_convolve8_avg_horiz; 105b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][0] = vp9_convolve8; 106b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][1] = vp9_convolve8_avg; 107b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][0] = vp9_convolve8_horiz; 108b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][1] = vp9_convolve8_avg_horiz; 1091184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } else { 1101184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // Must always scale in both directions. 111b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][0] = vp9_convolve8; 112b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][0][1] = vp9_convolve8_avg; 113b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][0] = vp9_convolve8; 114b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[0][1][1] = vp9_convolve8_avg; 115b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][0] = vp9_convolve8; 116b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][0][1] = vp9_convolve8_avg; 1171184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } 1181184aebb761cbeac9124c37189a80a1a58f04b6bhkuang } 1191184aebb761cbeac9124c37189a80a1a58f04b6bhkuang // 2D subpel motion always gets filtered in both directions 120b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][1][0] = vp9_convolve8; 121b08e2e23eec181e9951df33cd704ac294c5407b6Vignesh Venkatasubramanian sf->predict[1][1][1] = vp9_convolve8_avg; 1221184aebb761cbeac9124c37189a80a1a58f04b6bhkuang} 123