265 lines
10 KiB
C
265 lines
10 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <assert.h>
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#include "./vpx_scale_rtcd.h"
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#include "./vpx_config.h"
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#include "vpx/vpx_integer.h"
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#include "vp9/common/vp9_blockd.h"
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#include "vp9/common/vp9_filter.h"
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#include "vp9/common/vp9_reconinter.h"
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#include "vp9/common/vp9_reconintra.h"
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void vp9_setup_interp_filters(MACROBLOCKD *xd,
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INTERPOLATIONFILTERTYPE mcomp_filter_type,
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VP9_COMMON *cm) {
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if (xd->mode_info_context) {
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MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
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set_scale_factors(xd, mbmi->ref_frame[0] - 1, mbmi->ref_frame[1] - 1,
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cm->active_ref_scale);
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}
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switch (mcomp_filter_type) {
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case EIGHTTAP:
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case SWITCHABLE:
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xd->subpix.filter_x = xd->subpix.filter_y = vp9_sub_pel_filters_8;
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break;
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case EIGHTTAP_SMOOTH:
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xd->subpix.filter_x = xd->subpix.filter_y = vp9_sub_pel_filters_8lp;
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break;
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case EIGHTTAP_SHARP:
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xd->subpix.filter_x = xd->subpix.filter_y = vp9_sub_pel_filters_8s;
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break;
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case BILINEAR:
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xd->subpix.filter_x = xd->subpix.filter_y = vp9_bilinear_filters;
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break;
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}
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assert(((intptr_t)xd->subpix.filter_x & 0xff) == 0);
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}
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void vp9_build_inter_predictor(const uint8_t *src, int src_stride,
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uint8_t *dst, int dst_stride,
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const MV *src_mv,
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const struct scale_factors *scale,
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int w, int h, int ref,
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const struct subpix_fn_table *subpix,
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enum mv_precision precision) {
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const int is_q4 = precision == MV_PRECISION_Q4;
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const MV mv_q4 = { is_q4 ? src_mv->row : src_mv->row << 1,
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is_q4 ? src_mv->col : src_mv->col << 1 };
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const MV32 mv = scale->scale_mv(&mv_q4, scale);
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const int subpel_x = mv.col & SUBPEL_MASK;
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const int subpel_y = mv.row & SUBPEL_MASK;
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src += (mv.row >> SUBPEL_BITS) * src_stride + (mv.col >> SUBPEL_BITS);
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scale->predict[subpel_x != 0][subpel_y != 0][ref](
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src, src_stride, dst, dst_stride,
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subpix->filter_x[subpel_x], scale->x_step_q4,
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subpix->filter_y[subpel_y], scale->y_step_q4,
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w, h);
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}
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static INLINE int round_mv_comp_q4(int value) {
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return (value < 0 ? value - 2 : value + 2) / 4;
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}
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static MV mi_mv_pred_q4(const MODE_INFO *mi, int idx) {
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MV res = { round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.row +
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mi->bmi[1].as_mv[idx].as_mv.row +
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mi->bmi[2].as_mv[idx].as_mv.row +
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mi->bmi[3].as_mv[idx].as_mv.row),
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round_mv_comp_q4(mi->bmi[0].as_mv[idx].as_mv.col +
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mi->bmi[1].as_mv[idx].as_mv.col +
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mi->bmi[2].as_mv[idx].as_mv.col +
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mi->bmi[3].as_mv[idx].as_mv.col) };
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return res;
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}
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// TODO(jkoleszar): yet another mv clamping function :-(
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MV clamp_mv_to_umv_border_sb(const MACROBLOCKD *xd, const MV *src_mv,
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int bw, int bh, int ss_x, int ss_y) {
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// If the MV points so far into the UMV border that no visible pixels
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// are used for reconstruction, the subpel part of the MV can be
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// discarded and the MV limited to 16 pixels with equivalent results.
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const int spel_left = (VP9_INTERP_EXTEND + bw) << SUBPEL_BITS;
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const int spel_right = spel_left - SUBPEL_SHIFTS;
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const int spel_top = (VP9_INTERP_EXTEND + bh) << SUBPEL_BITS;
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const int spel_bottom = spel_top - SUBPEL_SHIFTS;
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MV clamped_mv = {
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src_mv->row << (1 - ss_y),
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src_mv->col << (1 - ss_x)
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};
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assert(ss_x <= 1);
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assert(ss_y <= 1);
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clamp_mv(&clamped_mv, (xd->mb_to_left_edge << (1 - ss_x)) - spel_left,
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(xd->mb_to_right_edge << (1 - ss_x)) + spel_right,
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(xd->mb_to_top_edge << (1 - ss_y)) - spel_top,
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(xd->mb_to_bottom_edge << (1 - ss_y)) + spel_bottom);
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return clamped_mv;
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}
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struct build_inter_predictors_args {
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MACROBLOCKD *xd;
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int x, y;
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};
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static void build_inter_predictors(int plane, int block,
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BLOCK_SIZE_TYPE bsize,
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int pred_w, int pred_h,
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void *argv) {
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const struct build_inter_predictors_args* const arg = argv;
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MACROBLOCKD *const xd = arg->xd;
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struct macroblockd_plane *const pd = &xd->plane[plane];
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const int bwl = b_width_log2(bsize) - pd->subsampling_x;
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const int bw = 4 << bwl;
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const int bh = plane_block_height(bsize, pd);
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const int x = 4 * (block & ((1 << bwl) - 1));
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const int y = 4 * (block >> bwl);
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const MODE_INFO *const mi = xd->mode_info_context;
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const int use_second_ref = mi->mbmi.ref_frame[1] > 0;
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int ref;
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assert(x < bw);
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assert(y < bh);
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assert(mi->mbmi.sb_type < BLOCK_8X8 || 4 << pred_w == bw);
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assert(mi->mbmi.sb_type < BLOCK_8X8 || 4 << pred_h == bh);
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for (ref = 0; ref < 1 + use_second_ref; ++ref) {
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struct scale_factors *const scale = &xd->scale_factor[ref];
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struct buf_2d *const pre_buf = &pd->pre[ref];
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struct buf_2d *const dst_buf = &pd->dst;
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const uint8_t *const pre = pre_buf->buf + scaled_buffer_offset(x, y,
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pre_buf->stride, scale);
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uint8_t *const dst = dst_buf->buf + dst_buf->stride * y + x;
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// TODO(jkoleszar): All chroma MVs in SPLITMV mode are taken as the
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// same MV (the average of the 4 luma MVs) but we could do something
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// smarter for non-4:2:0. Just punt for now, pending the changes to get
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// rid of SPLITMV mode entirely.
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const MV mv = mi->mbmi.sb_type < BLOCK_8X8
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? (plane == 0 ? mi->bmi[block].as_mv[ref].as_mv
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: mi_mv_pred_q4(mi, ref))
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: mi->mbmi.mv[ref].as_mv;
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// TODO(jkoleszar): This clamping is done in the incorrect place for the
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// scaling case. It needs to be done on the scaled MV, not the pre-scaling
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// MV. Note however that it performs the subsampling aware scaling so
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// that the result is always q4.
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const MV res_mv = clamp_mv_to_umv_border_sb(xd, &mv, bw, bh,
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pd->subsampling_x,
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pd->subsampling_y);
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scale->set_scaled_offsets(scale, arg->y + y, arg->x + x);
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vp9_build_inter_predictor(pre, pre_buf->stride, dst, dst_buf->stride,
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&res_mv, scale,
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4 << pred_w, 4 << pred_h, ref,
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&xd->subpix, MV_PRECISION_Q4);
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}
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}
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// TODO(jkoleszar): In principle, pred_w, pred_h are unnecessary, as we could
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// calculate the subsampled BLOCK_SIZE_TYPE, but that type isn't defined for
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// sizes smaller than 16x16 yet.
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typedef void (*foreach_predicted_block_visitor)(int plane, int block,
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BLOCK_SIZE_TYPE bsize,
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int pred_w, int pred_h,
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void *arg);
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static INLINE void foreach_predicted_block_in_plane(
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const MACROBLOCKD* const xd, BLOCK_SIZE_TYPE bsize, int plane,
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foreach_predicted_block_visitor visit, void *arg) {
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int i, x, y;
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// block sizes in number of 4x4 blocks log 2 ("*_b")
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// 4x4=0, 8x8=2, 16x16=4, 32x32=6, 64x64=8
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// subsampled size of the block
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const int bwl = b_width_log2(bsize) - xd->plane[plane].subsampling_x;
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const int bhl = b_height_log2(bsize) - xd->plane[plane].subsampling_y;
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// size of the predictor to use.
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int pred_w, pred_h;
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if (xd->mode_info_context->mbmi.sb_type < BLOCK_8X8) {
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assert(bsize == BLOCK_8X8);
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pred_w = 0;
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pred_h = 0;
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} else {
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pred_w = bwl;
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pred_h = bhl;
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}
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assert(pred_w <= bwl);
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assert(pred_h <= bhl);
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// visit each subblock in raster order
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i = 0;
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for (y = 0; y < 1 << bhl; y += 1 << pred_h) {
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for (x = 0; x < 1 << bwl; x += 1 << pred_w) {
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visit(plane, i, bsize, pred_w, pred_h, arg);
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i += 1 << pred_w;
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}
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i += (1 << (bwl + pred_h)) - (1 << bwl);
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}
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}
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static void build_inter_predictors_for_planes(MACROBLOCKD *xd,
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BLOCK_SIZE_TYPE bsize,
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int mi_row, int mi_col,
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int plane_from, int plane_to) {
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int plane;
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for (plane = plane_from; plane <= plane_to; ++plane) {
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struct build_inter_predictors_args args = {
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xd, mi_col * MI_SIZE, mi_row * MI_SIZE,
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};
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foreach_predicted_block_in_plane(xd, bsize, plane, build_inter_predictors,
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&args);
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}
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}
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void vp9_build_inter_predictors_sby(MACROBLOCKD *xd, int mi_row, int mi_col,
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BLOCK_SIZE_TYPE bsize) {
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build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0, 0);
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}
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void vp9_build_inter_predictors_sbuv(MACROBLOCKD *xd, int mi_row, int mi_col,
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BLOCK_SIZE_TYPE bsize) {
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build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 1,
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MAX_MB_PLANE - 1);
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}
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void vp9_build_inter_predictors_sb(MACROBLOCKD *xd, int mi_row, int mi_col,
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BLOCK_SIZE_TYPE bsize) {
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build_inter_predictors_for_planes(xd, bsize, mi_row, mi_col, 0,
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MAX_MB_PLANE - 1);
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}
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// TODO(dkovalev: find better place for this function)
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void vp9_setup_scale_factors(VP9_COMMON *cm, int i) {
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const int ref = cm->active_ref_idx[i];
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struct scale_factors *const sf = &cm->active_ref_scale[i];
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if (ref >= NUM_YV12_BUFFERS) {
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vp9_zero(*sf);
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} else {
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YV12_BUFFER_CONFIG *const fb = &cm->yv12_fb[ref];
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vp9_setup_scale_factors_for_frame(cm, sf,
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fb->y_crop_width, fb->y_crop_height,
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cm->width, cm->height);
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if (vp9_is_scaled(sf))
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vp9_extend_frame_borders(fb, cm->subsampling_x, cm->subsampling_y);
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}
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}
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