libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_vaq.c

-/*
- *  Copyright (c) 2013 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 <math.h>
-
-#include "vp9/encoder/vp9_vaq.h"
-
-#include "vp9/common/vp9_seg_common.h"
-
-#include "vp9/encoder/vp9_ratectrl.h"
-#include "vp9/encoder/vp9_rdopt.h"
-#include "vp9/encoder/vp9_segmentation.h"
-#include "vp9/common/vp9_systemdependent.h"
-
-#define ENERGY_MIN (-1)
-#define ENERGY_MAX (1)
-#define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN +  1)
-#define ENERGY_IN_BOUNDS(energy)\
-  assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
-
-static double q_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
-static double rdmult_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
-static int segment_id[MAX_SEGMENTS] = { 5, 3, 1, 0, 2, 4, 6, 7 };
-
-#define Q_RATIO(i) q_ratio[(i) - ENERGY_MIN]
-#define RDMULT_RATIO(i) rdmult_ratio[(i) - ENERGY_MIN]
-#define SEGMENT_ID(i) segment_id[(i) - ENERGY_MIN]
-
-DECLARE_ALIGNED(16, static const uint8_t, vp9_64_zeros[64]) = {0};
-
-unsigned int vp9_vaq_segment_id(int energy) {
-  ENERGY_IN_BOUNDS(energy);
-
-  return SEGMENT_ID(energy);
-}
-
-double vp9_vaq_rdmult_ratio(int energy) {
-  ENERGY_IN_BOUNDS(energy);
-
-  vp9_clear_system_state();
-
-  return RDMULT_RATIO(energy);
-}
-
-double vp9_vaq_inv_q_ratio(int energy) {
-  ENERGY_IN_BOUNDS(energy);
-
-  vp9_clear_system_state();
-
-  return Q_RATIO(-energy);
-}
-
-void vp9_vaq_init() {
-  int i;
-  double base_ratio;
-
-  assert(ENERGY_SPAN <= MAX_SEGMENTS);
-
-  vp9_clear_system_state();
-
-  base_ratio = 1.5;
-
-  for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {
-    Q_RATIO(i) = pow(base_ratio, i/3.0);
-  }
-}
-
-void vp9_vaq_frame_setup(VP9_COMP *cpi) {
-  VP9_COMMON *cm = &cpi->common;
-  struct segmentation *seg = &cm->seg;
-  const double base_q = vp9_convert_qindex_to_q(cm->base_qindex);
-  const int base_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex +
-                                              cm->y_dc_delta_q);
-  int i;
-
-  if (cm->frame_type == KEY_FRAME ||
-      cpi->refresh_alt_ref_frame ||
-      (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
-    vp9_enable_segmentation(seg);
-    vp9_clearall_segfeatures(seg);
-
-    seg->abs_delta = SEGMENT_DELTADATA;
-
-  vp9_clear_system_state();
-
-    for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {
-      int qindex_delta, segment_rdmult;
-
-      if (Q_RATIO(i) == 1) {
-        // No need to enable SEG_LVL_ALT_Q for this segment
-        RDMULT_RATIO(i) = 1;
-        continue;
-      }
-
-      qindex_delta = vp9_compute_qdelta(cpi, base_q, base_q * Q_RATIO(i));
-      vp9_set_segdata(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q, qindex_delta);
-      vp9_enable_segfeature(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q);
-
-      segment_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex + qindex_delta +
-                                           cm->y_dc_delta_q);
-
-      RDMULT_RATIO(i) = (double) segment_rdmult / base_rdmult;
-    }
-  }
-}
-
-
-static unsigned int block_variance(VP9_COMP *cpi, MACROBLOCK *x,
-                                   BLOCK_SIZE bs) {
-  MACROBLOCKD *xd = &x->e_mbd;
-  unsigned int var, sse;
-  int right_overflow = (xd->mb_to_right_edge < 0) ?
-      ((-xd->mb_to_right_edge) >> 3) : 0;
-  int bottom_overflow = (xd->mb_to_bottom_edge < 0) ?
-      ((-xd->mb_to_bottom_edge) >> 3) : 0;
-
-  if (right_overflow || bottom_overflow) {
-    const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;
-    const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;
-    int avg;
-    variance(x->plane[0].src.buf, x->plane[0].src.stride,
-             vp9_64_zeros, 0, bw, bh, &sse, &avg);
-    var = sse - (((int64_t)avg * avg) / (bw * bh));
-    return (256 * var) / (bw * bh);
-  } else {
-    var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf,
-                             x->plane[0].src.stride,
-                             vp9_64_zeros, 0, &sse);
-    return (256 * var) >> num_pels_log2_lookup[bs];
-  }
-}
-
-int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
-  double energy;
-  unsigned int var = block_variance(cpi, x, bs);
-
-  vp9_clear_system_state();
-
-  energy = 0.9 * (log(var + 1.0) - 10.0);
-  return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
-}