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 /*

  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.

  *

  *  Use of this source code is governed by a BSD-style license

  *  that can be found in the LICENSE file in the root of the source

  *  tree. An additional intellectual property rights grant can be found

  *  in the file PATENTS.  All contributing project authors may

  *  be found in the AUTHORS file in the root of the source tree.

  */

 #include <limits.h>

 #include "vpx_mem/vpx_mem.h"

 #include "vp9/encoder/vp9_encodeintra.h"

 #include "vp9/encoder/vp9_rdopt.h"

 #include "vp9/encoder/vp9_segmentation.h"

 #include "vp9/encoder/vp9_mcomp.h"

 #include "vp9/common/vp9_blockd.h"

 #include "vp9/common/vp9_reconinter.h"

 #include "vp9/common/vp9_reconintra.h"

 #include "vp9/common/vp9_systemdependent.h"

 static unsigned int do_16x16_motion_iteration(VP9_COMP *cpi,

                                               int_mv *ref_mv,

                                               int_mv *dst_mv,

                                               int mb_row,

                                               int mb_col) {

   MACROBLOCK   *const x  = &cpi->mb;

   MACROBLOCKD *const xd = &x->e_mbd;

   vp9_variance_fn_ptr_t v_fn_ptr = cpi->fn_ptr[BLOCK_16X16];

   unsigned int best_err;

   const int tmp_col_min = x->mv_col_min;

   const int tmp_col_max = x->mv_col_max;

   const int tmp_row_min = x->mv_row_min;

   const int tmp_row_max = x->mv_row_max;

   int_mv ref_full;

   // Further step/diamond searches as necessary

   int step_param = cpi->sf.reduce_first_step_size +

       (cpi->speed < 8 ? (cpi->speed > 5 ? 1 : 0) : 2);

   step_param = MIN(step_param, (cpi->sf.max_step_search_steps - 2));

   vp9_clamp_mv_min_max(x, &ref_mv->as_mv);

   ref_full.as_mv.col = ref_mv->as_mv.col >> 3;

   ref_full.as_mv.row = ref_mv->as_mv.row >> 3;

   /*cpi->sf.search_method == HEX*/

   best_err = vp9_hex_search(x, &ref_full.as_mv, step_param, x->errorperbit,

                             0, &v_fn_ptr,

                             0, &ref_mv->as_mv, &dst_mv->as_mv);

   // Try sub-pixel MC

   // if (bestsme > error_thresh && bestsme < INT_MAX)

   {

     int distortion;

     unsigned int sse;

     best_err = cpi->find_fractional_mv_step(

         x,

         &dst_mv->as_mv, &ref_mv->as_mv,

         cpi->common.allow_high_precision_mv,

         x->errorperbit, &v_fn_ptr,

         0, cpi->sf.subpel_iters_per_step, NULL, NULL,

         & distortion, &sse);

   }

   vp9_set_mbmode_and_mvs(x, NEWMV, dst_mv);

   vp9_build_inter_predictors_sby(xd, mb_row, mb_col, BLOCK_16X16);

   best_err = vp9_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,

                           xd->plane[0].dst.buf, xd->plane[0].dst.stride,

                           INT_MAX);

   /* restore UMV window */

   x->mv_col_min = tmp_col_min;

   x->mv_col_max = tmp_col_max;

   x->mv_row_min = tmp_row_min;

   x->mv_row_max = tmp_row_max;

   return best_err;

 }

 static int do_16x16_motion_search(VP9_COMP *cpi, int_mv *ref_mv, int_mv *dst_mv,

                                   int mb_row, int mb_col) {

   MACROBLOCK *const x = &cpi->mb;

   MACROBLOCKD *const xd = &x->e_mbd;

   unsigned int err, tmp_err;

   int_mv tmp_mv;

   // Try zero MV first

   // FIXME should really use something like near/nearest MV and/or MV prediction

   err = vp9_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,

                      xd->plane[0].pre[0].buf, xd->plane[0].pre[0].stride,

                      INT_MAX);

   dst_mv->as_int = 0;

   // Test last reference frame using the previous best mv as the

   // starting point (best reference) for the search

   tmp_err = do_16x16_motion_iteration(cpi, ref_mv, &tmp_mv, mb_row, mb_col);

   if (tmp_err < err) {

     err = tmp_err;

     dst_mv->as_int = tmp_mv.as_int;

   }

   // If the current best reference mv is not centered on 0,0 then do a 0,0

   // based search as well.

   if (ref_mv->as_int) {

     unsigned int tmp_err;

     int_mv zero_ref_mv, tmp_mv;

     zero_ref_mv.as_int = 0;

     tmp_err = do_16x16_motion_iteration(cpi, &zero_ref_mv, &tmp_mv,

                                         mb_row, mb_col);

     if (tmp_err < err) {

       dst_mv->as_int = tmp_mv.as_int;

       err = tmp_err;

     }

   }

   return err;

 }

 static int do_16x16_zerozero_search(VP9_COMP *cpi, int_mv *dst_mv) {

   MACROBLOCK *const x = &cpi->mb;

   MACROBLOCKD *const xd = &x->e_mbd;

   unsigned int err;

   // Try zero MV first

   // FIXME should really use something like near/nearest MV and/or MV prediction

   err = vp9_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,

                      xd->plane[0].pre[0].buf, xd->plane[0].pre[0].stride,

                      INT_MAX);

   dst_mv->as_int = 0;

   return err;

 }

 static int find_best_16x16_intra(VP9_COMP *cpi,

                                  int mb_y_offset,

                                  MB_PREDICTION_MODE *pbest_mode) {

   MACROBLOCK   *const x  = &cpi->mb;

   MACROBLOCKD *const xd = &x->e_mbd;

   MB_PREDICTION_MODE best_mode = -1, mode;

   unsigned int best_err = INT_MAX;

   // calculate SATD for each intra prediction mode;

   // we're intentionally not doing 4x4, we just want a rough estimate

   for (mode = DC_PRED; mode <= TM_PRED; mode++) {

     unsigned int err;

     xd->mi_8x8[0]->mbmi.mode = mode;

     vp9_predict_intra_block(xd, 0, 2, TX_16X16, mode,

                             x->plane[0].src.buf, x->plane[0].src.stride,

                             xd->plane[0].dst.buf, xd->plane[0].dst.stride);

     err = vp9_sad16x16(x->plane[0].src.buf, x->plane[0].src.stride,

                        xd->plane[0].dst.buf, xd->plane[0].dst.stride, best_err);

     // find best

     if (err < best_err) {

       best_err  = err;

       best_mode = mode;

     }

   }

   if (pbest_mode)

     *pbest_mode = best_mode;

   return best_err;

 }

 static void update_mbgraph_mb_stats

 (

   VP9_COMP *cpi,

   MBGRAPH_MB_STATS *stats,

   YV12_BUFFER_CONFIG *buf,

   int mb_y_offset,

   YV12_BUFFER_CONFIG *golden_ref,

   int_mv *prev_golden_ref_mv,

   int gld_y_offset,

   YV12_BUFFER_CONFIG *alt_ref,

   int_mv *prev_alt_ref_mv,

   int arf_y_offset,

   int mb_row,

   int mb_col

 ) {

   MACROBLOCK *const x = &cpi->mb;

   MACROBLOCKD *const xd = &x->e_mbd;

   int intra_error;

   VP9_COMMON *cm = &cpi->common;

   // FIXME in practice we're completely ignoring chroma here

   x->plane[0].src.buf = buf->y_buffer + mb_y_offset;

   x->plane[0].src.stride = buf->y_stride;

   xd->plane[0].dst.buf = get_frame_new_buffer(cm)->y_buffer + mb_y_offset;

   xd->plane[0].dst.stride = get_frame_new_buffer(cm)->y_stride;

   // do intra 16x16 prediction

   intra_error = find_best_16x16_intra(cpi, mb_y_offset,

                                       &stats->ref[INTRA_FRAME].m.mode);

   if (intra_error <= 0)

     intra_error = 1;

   stats->ref[INTRA_FRAME].err = intra_error;

   // Golden frame MV search, if it exists and is different than last frame

   if (golden_ref) {

     int g_motion_error;

     xd->plane[0].pre[0].buf = golden_ref->y_buffer + mb_y_offset;

     xd->plane[0].pre[0].stride = golden_ref->y_stride;

     g_motion_error = do_16x16_motion_search(cpi,

                                             prev_golden_ref_mv,

                                             &stats->ref[GOLDEN_FRAME].m.mv,

                                             mb_row, mb_col);

     stats->ref[GOLDEN_FRAME].err = g_motion_error;

   } else {

     stats->ref[GOLDEN_FRAME].err = INT_MAX;

     stats->ref[GOLDEN_FRAME].m.mv.as_int = 0;

   }

   // Do an Alt-ref frame MV search, if it exists and is different than

   // last/golden frame.

   if (alt_ref) {

     int a_motion_error;

     xd->plane[0].pre[0].buf = alt_ref->y_buffer + mb_y_offset;

     xd->plane[0].pre[0].stride = alt_ref->y_stride;

     a_motion_error = do_16x16_zerozero_search(cpi,

                                               &stats->ref[ALTREF_FRAME].m.mv);

     stats->ref[ALTREF_FRAME].err = a_motion_error;

   } else {

     stats->ref[ALTREF_FRAME].err = INT_MAX;

     stats->ref[ALTREF_FRAME].m.mv.as_int = 0;

   }

 }

 static void update_mbgraph_frame_stats(VP9_COMP *cpi,

                                        MBGRAPH_FRAME_STATS *stats,

                                        YV12_BUFFER_CONFIG *buf,

                                        YV12_BUFFER_CONFIG *golden_ref,

                                        YV12_BUFFER_CONFIG *alt_ref) {

   MACROBLOCK *const x = &cpi->mb;

   MACROBLOCKD *const xd = &x->e_mbd;

   VP9_COMMON *const cm = &cpi->common;

   int mb_col, mb_row, offset = 0;

   int mb_y_offset = 0, arf_y_offset = 0, gld_y_offset = 0;

   int_mv arf_top_mv, gld_top_mv;

   MODE_INFO mi_local = { { 0 } };

   // Set up limit values for motion vectors to prevent them extending outside

   // the UMV borders.

   arf_top_mv.as_int = 0;

   gld_top_mv.as_int = 0;

   x->mv_row_min     = -BORDER_MV_PIXELS_B16;

   x->mv_row_max     = (cm->mb_rows - 1) * 8 + BORDER_MV_PIXELS_B16;

   xd->up_available  = 0;

   xd->plane[0].dst.stride  = buf->y_stride;

   xd->plane[0].pre[0].stride  = buf->y_stride;

   xd->plane[1].dst.stride = buf->uv_stride;

   xd->mi_8x8[0] = &mi_local;

   mi_local.mbmi.sb_type = BLOCK_16X16;

   mi_local.mbmi.ref_frame[0] = LAST_FRAME;

   mi_local.mbmi.ref_frame[1] = NONE;

   for (mb_row = 0; mb_row < cm->mb_rows; mb_row++) {

     int_mv arf_left_mv, gld_left_mv;

     int mb_y_in_offset  = mb_y_offset;

     int arf_y_in_offset = arf_y_offset;

     int gld_y_in_offset = gld_y_offset;

     // Set up limit values for motion vectors to prevent them extending outside

     // the UMV borders.

     arf_left_mv.as_int = arf_top_mv.as_int;

     gld_left_mv.as_int = gld_top_mv.as_int;

     x->mv_col_min      = -BORDER_MV_PIXELS_B16;

     x->mv_col_max      = (cm->mb_cols - 1) * 8 + BORDER_MV_PIXELS_B16;

     xd->left_available = 0;

     for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {

       MBGRAPH_MB_STATS *mb_stats = &stats->mb_stats[offset + mb_col];

       update_mbgraph_mb_stats(cpi, mb_stats, buf, mb_y_in_offset,

                               golden_ref, &gld_left_mv, gld_y_in_offset,

                               alt_ref,    &arf_left_mv, arf_y_in_offset,

                               mb_row, mb_col);

       arf_left_mv.as_int = mb_stats->ref[ALTREF_FRAME].m.mv.as_int;

       gld_left_mv.as_int = mb_stats->ref[GOLDEN_FRAME].m.mv.as_int;

       if (mb_col == 0) {

         arf_top_mv.as_int = arf_left_mv.as_int;

         gld_top_mv.as_int = gld_left_mv.as_int;

       }

       xd->left_available = 1;

       mb_y_in_offset    += 16;

       gld_y_in_offset   += 16;

       arf_y_in_offset   += 16;

       x->mv_col_min     -= 16;

       x->mv_col_max     -= 16;

     }

     xd->up_available = 1;

     mb_y_offset     += buf->y_stride * 16;

     gld_y_offset    += golden_ref->y_stride * 16;

     if (alt_ref)

       arf_y_offset    += alt_ref->y_stride * 16;

     x->mv_row_min   -= 16;

     x->mv_row_max   -= 16;

     offset          += cm->mb_cols;

   }

 }

 // void separate_arf_mbs_byzz

 static void separate_arf_mbs(VP9_COMP *cpi) {

   VP9_COMMON *const cm = &cpi->common;

   int mb_col, mb_row, offset, i;

   int mi_row, mi_col;

   int ncnt[4] = { 0 };

   int n_frames = cpi->mbgraph_n_frames;

   int *arf_not_zz;

   CHECK_MEM_ERROR(cm, arf_not_zz,

                   vpx_calloc(cm->mb_rows * cm->mb_cols * sizeof(*arf_not_zz),

                              1));

   // We are not interested in results beyond the alt ref itself.

   if (n_frames > cpi->frames_till_gf_update_due)

     n_frames = cpi->frames_till_gf_update_due;

   // defer cost to reference frames

   for (i = n_frames - 1; i >= 0; i--) {

     MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];

     for (offset = 0, mb_row = 0; mb_row < cm->mb_rows;

          offset += cm->mb_cols, mb_row++) {

       for (mb_col = 0; mb_col < cm->mb_cols; mb_col++) {

         MBGRAPH_MB_STATS *mb_stats = &frame_stats->mb_stats[offset + mb_col];

         int altref_err = mb_stats->ref[ALTREF_FRAME].err;

         int intra_err  = mb_stats->ref[INTRA_FRAME ].err;

         int golden_err = mb_stats->ref[GOLDEN_FRAME].err;

         // Test for altref vs intra and gf and that its mv was 0,0.

         if (altref_err > 1000 ||

             altref_err > intra_err ||

             altref_err > golden_err) {

           arf_not_zz[offset + mb_col]++;

         }

       }

     }

   }

   // arf_not_zz is indexed by MB, but this loop is indexed by MI to avoid out

   // of bound access in segmentation_map

   for (mi_row = 0; mi_row < cm->mi_rows; mi_row++) {

     for (mi_col = 0; mi_col < cm->mi_cols; mi_col++) {

       // If any of the blocks in the sequence failed then the MB

       // goes in segment 0

       if (arf_not_zz[mi_row/2*cm->mb_cols + mi_col/2]) {

         ncnt[0]++;

         cpi->segmentation_map[mi_row * cm->mi_cols + mi_col] = 0;

       } else {

         cpi->segmentation_map[mi_row * cm->mi_cols + mi_col] = 1;

         ncnt[1]++;

       }

     }

   }

   // Only bother with segmentation if over 10% of the MBs in static segment

   // if ( ncnt[1] && (ncnt[0] / ncnt[1] < 10) )

   if (1) {

     // Note % of blocks that are marked as static

     if (cm->MBs)

       cpi->static_mb_pct = (ncnt[1] * 100) / (cm->mi_rows * cm->mi_cols);

     // This error case should not be reachable as this function should

     // never be called with the common data structure uninitialized.

     else

       cpi->static_mb_pct = 0;

     cpi->seg0_cnt = ncnt[0];

     vp9_enable_segmentation((VP9_PTR)cpi);

   } else {

     cpi->static_mb_pct = 0;

     vp9_disable_segmentation((VP9_PTR)cpi);

   }

   // Free localy allocated storage

   vpx_free(arf_not_zz);

 }

 void vp9_update_mbgraph_stats(VP9_COMP *cpi) {

   VP9_COMMON *const cm = &cpi->common;

   int i, n_frames = vp9_lookahead_depth(cpi->lookahead);

   YV12_BUFFER_CONFIG *golden_ref =

       &cm->yv12_fb[cm->ref_frame_map[cpi->gld_fb_idx]];

   // we need to look ahead beyond where the ARF transitions into

   // being a GF - so exit if we don't look ahead beyond that

   if (n_frames <= cpi->frames_till_gf_update_due)

     return;

   if (n_frames > (int)cpi->frames_till_alt_ref_frame)

     n_frames = cpi->frames_till_alt_ref_frame;

   if (n_frames > MAX_LAG_BUFFERS)

     n_frames = MAX_LAG_BUFFERS;

   cpi->mbgraph_n_frames = n_frames;

   for (i = 0; i < n_frames; i++) {

     MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];

     vpx_memset(frame_stats->mb_stats, 0,

                cm->mb_rows * cm->mb_cols *

                sizeof(*cpi->mbgraph_stats[i].mb_stats));

   }

   // do motion search to find contribution of each reference to data

   // later on in this GF group

   // FIXME really, the GF/last MC search should be done forward, and

   // the ARF MC search backwards, to get optimal results for MV caching

   for (i = 0; i < n_frames; i++) {

     MBGRAPH_FRAME_STATS *frame_stats = &cpi->mbgraph_stats[i];

     struct lookahead_entry *q_cur = vp9_lookahead_peek(cpi->lookahead, i);

     assert(q_cur != NULL);

     update_mbgraph_frame_stats(cpi, frame_stats, &q_cur->img,

                                golden_ref, cpi->Source);

   }

   vp9_clear_system_state();  // __asm emms;

   separate_arf_mbs(cpi);

 }