michael@0: /*
michael@0:  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0:  *
michael@0:  *  Use of this source code is governed by a BSD-style license
michael@0:  *  that can be found in the LICENSE file in the root of the source
michael@0:  *  tree. An additional intellectual property rights grant can be found
michael@0:  *  in the file PATENTS.  All contributing project authors may
michael@0:  *  be found in the AUTHORS file in the root of the source tree.
michael@0:  */
michael@0: 
michael@0: #include <assert.h>
michael@0: 
michael@0: #include "./vpx_scale_rtcd.h"
michael@0: #include "./vpx_config.h"
michael@0: 
michael@0: #include "vpx/vpx_integer.h"
michael@0: 
michael@0: #include "vp9/common/vp9_blockd.h"
michael@0: #include "vp9/common/vp9_filter.h"
michael@0: #include "vp9/common/vp9_reconinter.h"
michael@0: #include "vp9/common/vp9_reconintra.h"
michael@0: 
michael@0: void vp9_setup_interp_filters(MACROBLOCKD *xd,
michael@0:                               INTERPOLATION_TYPE mcomp_filter_type,
michael@0:                               VP9_COMMON *cm) {
michael@0:   if (xd->mi_8x8 && xd->mi_8x8[0]) {
michael@0:     MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi;
michael@0: 
michael@0:     set_scale_factors(xd, mbmi->ref_frame[0] - LAST_FRAME,
michael@0:                           mbmi->ref_frame[1] - LAST_FRAME,
michael@0:                           cm->active_ref_scale);
michael@0:   } else {
michael@0:     set_scale_factors(xd, -1, -1, cm->active_ref_scale);
michael@0:   }
michael@0: 
michael@0:   xd->subpix.filter_x = xd->subpix.filter_y =
michael@0:       vp9_get_filter_kernel(mcomp_filter_type == SWITCHABLE ?
michael@0:                                EIGHTTAP : mcomp_filter_type);
michael@0: 
michael@0:   assert(((intptr_t)xd->subpix.filter_x & 0xff) == 0);
michael@0: }
michael@0: 
michael@0: static void inter_predictor(const uint8_t *src, int src_stride,
michael@0:                             uint8_t *dst, int dst_stride,
michael@0:                             const MV32 *mv,
michael@0:                             const struct scale_factors *scale,
michael@0:                             int w, int h, int ref,
michael@0:                             const struct subpix_fn_table *subpix,
michael@0:                             int xs, int ys) {
michael@0:   const int subpel_x = mv->col & SUBPEL_MASK;
michael@0:   const int subpel_y = mv->row & SUBPEL_MASK;
michael@0: 
michael@0:   src += (mv->row >> SUBPEL_BITS) * src_stride + (mv->col >> SUBPEL_BITS);
michael@0:   scale->sfc->predict[subpel_x != 0][subpel_y != 0][ref](
michael@0:       src, src_stride, dst, dst_stride,
michael@0:       subpix->filter_x[subpel_x], xs,
michael@0:       subpix->filter_y[subpel_y], ys,
michael@0:       w, h);
michael@0: }
michael@0: 
michael@0: void vp9_build_inter_predictor(const uint8_t *src, int src_stride,
michael@0:                                uint8_t *dst, int dst_stride,
michael@0:                                const MV *src_mv,
michael@0:                                const struct scale_factors *scale,
michael@0:                                int w, int h, int ref,
michael@0:                                const struct subpix_fn_table *subpix,
michael@0:                                enum mv_precision precision) {
michael@0:   const int is_q4 = precision == MV_PRECISION_Q4;
michael@0:   const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row * 2,
michael@0:                      is_q4 ? src_mv->col : src_mv->col * 2 };
michael@0:   const struct scale_factors_common *sfc = scale->sfc;
michael@0:   const MV32 mv = sfc->scale_mv(&mv_q4, scale);
michael@0: 
michael@0:   inter_predictor(src, src_stride, dst, dst_stride, &mv, scale,
michael@0:                   w, h, ref, subpix, sfc->x_step_q4, sfc->y_step_q4);
michael@0: }
michael@0: 
michael@0: static INLINE int round_mv_comp_q4(int value) {
michael@0:   return (value < 0 ? value - 2 : value + 2) / 4;
michael@0: }
michael@0: 
michael@0: static MV mi_mv_pred_q4(const MODE_INFO *mi, int idx) {
michael@0:   MV res = { round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.row +
michael@0:                               mi->bmi[1].as_mv[idx].as_mv.row +
michael@0:                               mi->bmi[2].as_mv[idx].as_mv.row +
michael@0:                               mi->bmi[3].as_mv[idx].as_mv.row),
michael@0:              round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.col +
michael@0:                               mi->bmi[1].as_mv[idx].as_mv.col +
michael@0:                               mi->bmi[2].as_mv[idx].as_mv.col +
michael@0:                               mi->bmi[3].as_mv[idx].as_mv.col) };
michael@0:   return res;
michael@0: }
michael@0: 
michael@0: // TODO(jkoleszar): yet another mv clamping function :-(
michael@0: MV clamp_mv_to_umv_border_sb(const MACROBLOCKD *xd, const MV *src_mv,
michael@0:                              int bw, int bh, int ss_x, int ss_y) {
michael@0:   // If the MV points so far into the UMV border that no visible pixels
michael@0:   // are used for reconstruction, the subpel part of the MV can be
michael@0:   // discarded and the MV limited to 16 pixels with equivalent results.
michael@0:   const int spel_left = (VP9_INTERP_EXTEND + bw) << SUBPEL_BITS;
michael@0:   const int spel_right = spel_left - SUBPEL_SHIFTS;
michael@0:   const int spel_top = (VP9_INTERP_EXTEND + bh) << SUBPEL_BITS;
michael@0:   const int spel_bottom = spel_top - SUBPEL_SHIFTS;
michael@0:   MV clamped_mv = {
michael@0:     src_mv->row * (1 << (1 - ss_y)),
michael@0:     src_mv->col * (1 << (1 - ss_x))
michael@0:   };
michael@0:   assert(ss_x <= 1);
michael@0:   assert(ss_y <= 1);
michael@0: 
michael@0:   clamp_mv(&clamped_mv,
michael@0:            xd->mb_to_left_edge * (1 << (1 - ss_x)) - spel_left,
michael@0:            xd->mb_to_right_edge * (1 << (1 - ss_x)) + spel_right,
michael@0:            xd->mb_to_top_edge * (1 << (1 - ss_y)) - spel_top,
michael@0:            xd->mb_to_bottom_edge * (1 << (1 - ss_y)) + spel_bottom);
michael@0: 
michael@0:   return clamped_mv;
michael@0: }
michael@0: 
michael@0: 
michael@0: // TODO(jkoleszar): In principle, pred_w, pred_h are unnecessary, as we could
michael@0: // calculate the subsampled BLOCK_SIZE, but that type isn't defined for
michael@0: // sizes smaller than 16x16 yet.
michael@0: static void build_inter_predictors(MACROBLOCKD *xd, int plane, int block,
michael@0:                                    BLOCK_SIZE bsize, int pred_w, int pred_h,
michael@0:                                    int mi_x, int mi_y) {
michael@0:   struct macroblockd_plane *const pd = &xd->plane[plane];
michael@0:   const int bwl = b_width_log2(bsize) - pd->subsampling_x;
michael@0:   const int bw = 4 << bwl;
michael@0:   const int bh = plane_block_height(bsize, pd);
michael@0:   const int x = 4 * (block & ((1 << bwl) - 1));
michael@0:   const int y = 4 * (block >> bwl);
michael@0:   const MODE_INFO *mi = xd->mi_8x8[0];
michael@0:   const int is_compound = has_second_ref(&mi->mbmi);
michael@0:   int ref;
michael@0: 
michael@0:   assert(x < bw);
michael@0:   assert(y < bh);
michael@0:   assert(mi->mbmi.sb_type < BLOCK_8X8 || 4 << pred_w == bw);
michael@0:   assert(mi->mbmi.sb_type < BLOCK_8X8 || 4 << pred_h == bh);
michael@0: 
michael@0:   for (ref = 0; ref < 1 + is_compound; ++ref) {
michael@0:     struct scale_factors *const scale = &xd->scale_factor[ref];
michael@0:     struct buf_2d *const pre_buf = &pd->pre[ref];
michael@0:     struct buf_2d *const dst_buf = &pd->dst;
michael@0:     uint8_t *const dst = dst_buf->buf + dst_buf->stride * y + x;
michael@0: 
michael@0:     // TODO(jkoleszar): All chroma MVs in SPLITMV mode are taken as the
michael@0:     // same MV (the average of the 4 luma MVs) but we could do something
michael@0:     // smarter for non-4:2:0. Just punt for now, pending the changes to get
michael@0:     // rid of SPLITMV mode entirely.
michael@0:     const MV mv = mi->mbmi.sb_type < BLOCK_8X8
michael@0:                ? (plane == 0 ? mi->bmi[block].as_mv[ref].as_mv
michael@0:                              : mi_mv_pred_q4(mi, ref))
michael@0:                : mi->mbmi.mv[ref].as_mv;
michael@0: 
michael@0:     // TODO(jkoleszar): This clamping is done in the incorrect place for the
michael@0:     // scaling case. It needs to be done on the scaled MV, not the pre-scaling
michael@0:     // MV. Note however that it performs the subsampling aware scaling so
michael@0:     // that the result is always q4.
michael@0:     // mv_precision precision is MV_PRECISION_Q4.
michael@0:     const MV mv_q4 = clamp_mv_to_umv_border_sb(xd, &mv, bw, bh,
michael@0:                                                pd->subsampling_x,
michael@0:                                                pd->subsampling_y);
michael@0: 
michael@0:     uint8_t *pre;
michael@0:     MV32 scaled_mv;
michael@0:     int xs, ys;
michael@0: 
michael@0:     if (vp9_is_scaled(scale->sfc)) {
michael@0:       pre = pre_buf->buf + scaled_buffer_offset(x, y, pre_buf->stride, scale);
michael@0:       scale->sfc->set_scaled_offsets(scale, mi_y + y, mi_x + x);
michael@0:       scaled_mv = scale->sfc->scale_mv(&mv_q4, scale);
michael@0:       xs = scale->sfc->x_step_q4;
michael@0:       ys = scale->sfc->y_step_q4;
michael@0:     } else {
michael@0:       pre = pre_buf->buf + (y * pre_buf->stride + x);
michael@0:       scaled_mv.row = mv_q4.row;
michael@0:       scaled_mv.col = mv_q4.col;
michael@0:       xs = ys = 16;
michael@0:     }
michael@0: 
michael@0:     inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride,
michael@0:                     &scaled_mv, scale,
michael@0:                     4 << pred_w, 4 << pred_h, ref,
michael@0:                     &xd->subpix, xs, ys);
michael@0:   }
michael@0: }
michael@0: 
michael@0: static void build_inter_predictors_for_planes(MACROBLOCKD *xd, BLOCK_SIZE bsize,
michael@0:                                               int mi_row, int mi_col,
michael@0:                                               int plane_from, int plane_to) {
michael@0:   int plane;
michael@0:   for (plane = plane_from; plane <= plane_to; ++plane) {
michael@0:     const int mi_x = mi_col * MI_SIZE;
michael@0:     const int mi_y = mi_row * MI_SIZE;
michael@0:     const int bwl = b_width_log2(bsize) - xd->plane[plane].subsampling_x;
michael@0:     const int bhl = b_height_log2(bsize) - xd->plane[plane].subsampling_y;
michael@0: 
michael@0:     if (xd->mi_8x8[0]->mbmi.sb_type < BLOCK_8X8) {
michael@0:       int i = 0, x, y;
michael@0:       assert(bsize == BLOCK_8X8);
michael@0:       for (y = 0; y < 1 << bhl; ++y)
michael@0:         for (x = 0; x < 1 << bwl; ++x)
michael@0:           build_inter_predictors(xd, plane, i++, bsize, 0, 0, mi_x, mi_y);
michael@0:     } else {
michael@0:       build_inter_predictors(xd, plane, 0, bsize, bwl, bhl, mi_x, mi_y);
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: void vp9_build_inter_predictors_sby(MACROBLOCKD *xd, int mi_row, int mi_col,
michael@0:                                     BLOCK_SIZE bsize) {
michael@0:   build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0, 0);
michael@0: }
michael@0: void vp9_build_inter_predictors_sbuv(MACROBLOCKD *xd, int mi_row, int mi_col,
michael@0:                                      BLOCK_SIZE bsize) {
michael@0:   build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 1,
michael@0:                                     MAX_MB_PLANE - 1);
michael@0: }
michael@0: void vp9_build_inter_predictors_sb(MACROBLOCKD *xd, int mi_row, int mi_col,
michael@0:                                    BLOCK_SIZE bsize) {
michael@0:   build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0,
michael@0:                                     MAX_MB_PLANE - 1);
michael@0: }
michael@0: 
michael@0: // TODO(dkovalev: find better place for this function)
michael@0: void vp9_setup_scale_factors(VP9_COMMON *cm, int i) {
michael@0:   const int ref = cm->active_ref_idx[i];
michael@0:   struct scale_factors *const sf = &cm->active_ref_scale[i];
michael@0:   struct scale_factors_common *const sfc = &cm->active_ref_scale_comm[i];
michael@0:   if (ref >= NUM_YV12_BUFFERS) {
michael@0:     vp9_zero(*sf);
michael@0:     vp9_zero(*sfc);
michael@0:   } else {
michael@0:     YV12_BUFFER_CONFIG *const fb = &cm->yv12_fb[ref];
michael@0:     vp9_setup_scale_factors_for_frame(sf, sfc,
michael@0:                                       fb->y_crop_width, fb->y_crop_height,
michael@0:                                       cm->width, cm->height);
michael@0: 
michael@0:     if (vp9_is_scaled(sfc))
michael@0:       vp9_extend_frame_borders(fb, cm->subsampling_x, cm->subsampling_y);
michael@0:   }
michael@0: }
michael@0: