1 files changed, 202 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/aq_variance.c b/third_party/aom/av1/encoder/aq_variance.c
new file mode 100644
index 000000000..58f906bdc
--- /dev/null
+++ b/third_party/aom/av1/encoder/aq_variance.c
@@ -0,0 +1,202 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <math.h>
+
+#include "aom_ports/mem.h"
+
+#include "av1/encoder/aq_variance.h"
+#include "av1/common/seg_common.h"
+#include "av1/encoder/encodeframe.h"
+#include "av1/encoder/ratectrl.h"
+#include "av1/encoder/rd.h"
+#include "av1/encoder/segmentation.h"
+#include "av1/encoder/dwt.h"
+#include "aom_ports/system_state.h"
+
+static const double rate_ratio[MAX_SEGMENTS] = { 2.2, 1.7, 1.3, 1.0,
+                                                 0.9, .8,  .7,  .6 };
+
+static const double deltaq_rate_ratio[MAX_SEGMENTS] = { 2.5,  2.0, 1.5, 1.0,
+                                                        0.75, 1.0, 1.0, 1.0 };
+#define ENERGY_MIN (-4)
+#define ENERGY_MAX (1)
+#define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
+#define ENERGY_IN_BOUNDS(energy) \
+  assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
+
+DECLARE_ALIGNED(16, static const uint8_t, av1_all_zeros[MAX_SB_SIZE]) = { 0 };
+
+DECLARE_ALIGNED(16, static const uint16_t,
+                av1_highbd_all_zeros[MAX_SB_SIZE]) = { 0 };
+
+static const int segment_id[ENERGY_SPAN] = { 0, 1, 1, 2, 3, 4 };
+
+#define SEGMENT_ID(i) segment_id[(i)-ENERGY_MIN]
+
+void av1_vaq_frame_setup(AV1_COMP *cpi) {
+  AV1_COMMON *cm = &cpi->common;
+  struct segmentation *seg = &cm->seg;
+  int i;
+
+  int resolution_change =
+      cm->prev_frame && (cm->width != cm->prev_frame->width ||
+                         cm->height != cm->prev_frame->height);
+  int avg_energy = (int)(cpi->twopass.mb_av_energy - 2);
+  double avg_ratio;
+  if (avg_energy > 7) avg_energy = 7;
+  if (avg_energy < 0) avg_energy = 0;
+  avg_ratio = rate_ratio[avg_energy];
+
+  if (resolution_change) {
+    memset(cpi->segmentation_map, 0, cm->mi_rows * cm->mi_cols);
+    av1_clearall_segfeatures(seg);
+    aom_clear_system_state();
+    av1_disable_segmentation(seg);
+    return;
+  }
+  if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
+      cpi->refresh_alt_ref_frame ||
+      (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
+    cpi->vaq_refresh = 1;
+
+    av1_enable_segmentation(seg);
+    av1_clearall_segfeatures(seg);
+
+    aom_clear_system_state();
+
+    for (i = 0; i < MAX_SEGMENTS; ++i) {
+      // Set up avg segment id to be 1.0 and adjust the other segments around
+      // it.
+      int qindex_delta = av1_compute_qdelta_by_rate(
+          &cpi->rc, cm->frame_type, cm->base_qindex, rate_ratio[i] / avg_ratio,
+          cm->seq_params.bit_depth);
+
+      // We don't allow qindex 0 in a segment if the base value is not 0.
+      // Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
+      // Q delta is sometimes applied without going back around the rd loop.
+      // This could lead to an illegal combination of partition size and q.
+      if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
+        qindex_delta = -cm->base_qindex + 1;
+      }
+
+      av1_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
+      av1_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
+    }
+  }
+}
+
+int av1_log_block_var(const AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
+  // This functions returns a score for the blocks local variance as calculated
+  // by: sum of the log of the (4x4 variances) of each subblock to the current
+  // block (x,bs)
+  // * 32 / number of pixels in the block_size.
+  // This is used for segmentation because to avoid situations in which a large
+  // block with a gentle gradient gets marked high variance even though each
+  // subblock has a low variance.   This allows us to assign the same segment
+  // number for the same sorts of area regardless of how the partitioning goes.
+
+  MACROBLOCKD *xd = &x->e_mbd;
+  double var = 0;
+  unsigned int sse;
+  int i, j;
+
+  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;
+
+  const int bw = MI_SIZE * mi_size_wide[bs] - right_overflow;
+  const int bh = MI_SIZE * mi_size_high[bs] - bottom_overflow;
+
+  aom_clear_system_state();
+
+  for (i = 0; i < bh; i += 4) {
+    for (j = 0; j < bw; j += 4) {
+      if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
+        var +=
+            log(1.0 + cpi->fn_ptr[BLOCK_4X4].vf(
+                          x->plane[0].src.buf + i * x->plane[0].src.stride + j,
+                          x->plane[0].src.stride,
+                          CONVERT_TO_BYTEPTR(av1_highbd_all_zeros), 0, &sse) /
+                          16);
+      } else {
+        var +=
+            log(1.0 + cpi->fn_ptr[BLOCK_4X4].vf(
+                          x->plane[0].src.buf + i * x->plane[0].src.stride + j,
+                          x->plane[0].src.stride, av1_all_zeros, 0, &sse) /
+                          16);
+      }
+    }
+  }
+  // Use average of 4x4 log variance. The range for 8 bit 0 - 9.704121561.
+  var /= (bw / 4 * bh / 4);
+  if (var > 7) var = 7;
+
+  aom_clear_system_state();
+  return (int)(var);
+}
+
+#define DEFAULT_E_MIDPOINT 10.0
+
+unsigned int haar_ac_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
+  MACROBLOCKD *xd = &x->e_mbd;
+  int stride = x->plane[0].src.stride;
+  uint8_t *buf = x->plane[0].src.buf;
+  const int bw = MI_SIZE * mi_size_wide[bs];
+  const int bh = MI_SIZE * mi_size_high[bs];
+  int hbd = xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH;
+
+  int var = 0;
+  for (int r = 0; r < bh; r += 8)
+    for (int c = 0; c < bw; c += 8) {
+      var += av1_haar_ac_sad_8x8_uint8_input(buf + c + r * stride, stride, hbd);
+    }
+
+  return (unsigned int)((uint64_t)var * 256) >> num_pels_log2_lookup[bs];
+}
+
+double av1_log_block_wavelet_energy(MACROBLOCK *x, BLOCK_SIZE bs) {
+  unsigned int haar_sad = haar_ac_energy(x, bs);
+  aom_clear_system_state();
+  return log(haar_sad + 1.0);
+}
+
+int av1_block_wavelet_energy_level(const AV1_COMP *cpi, MACROBLOCK *x,
+                                   BLOCK_SIZE bs) {
+  double energy, energy_midpoint;
+  aom_clear_system_state();
+  energy_midpoint = (cpi->oxcf.pass == 2) ? cpi->twopass.frame_avg_haar_energy
+                                          : DEFAULT_E_MIDPOINT;
+  energy = av1_log_block_wavelet_energy(x, bs) - energy_midpoint;
+  return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
+}
+
+int av1_compute_deltaq_from_energy_level(const AV1_COMP *const cpi,
+                                         int block_var_level) {
+  int rate_level;
+  const AV1_COMMON *const cm = &cpi->common;
+
+  if (DELTAQ_MODULATION == 1) {
+    ENERGY_IN_BOUNDS(block_var_level);
+    rate_level = SEGMENT_ID(block_var_level);
+  } else {
+    rate_level = block_var_level;
+  }
+  int qindex_delta = av1_compute_qdelta_by_rate(
+      &cpi->rc, cm->frame_type, cm->base_qindex, deltaq_rate_ratio[rate_level],
+      cm->seq_params.bit_depth);
+
+  if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
+    qindex_delta = -cm->base_qindex + 1;
+  }
+  return qindex_delta;
+}