Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 497 insertions, 0 deletions

diff --git a/third_party/aom/av1/encoder/encodemv.c b/third_party/aom/av1/encoder/encodemv.c
new file mode 100644
index 000000000..a2a53f840
--- /dev/null
+++ b/third_party/aom/av1/encoder/encodemv.c
@@ -0,0 +1,497 @@
+/*
+ * 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 "av1/common/common.h"
+#include "av1/common/entropymode.h"
+
+#include "av1/encoder/cost.h"
+#include "av1/encoder/encodemv.h"
+#include "av1/encoder/subexp.h"
+
+#include "aom_dsp/aom_dsp_common.h"
+
+static struct av1_token mv_joint_encodings[MV_JOINTS];
+static struct av1_token mv_class_encodings[MV_CLASSES];
+static struct av1_token mv_fp_encodings[MV_FP_SIZE];
+
+void av1_entropy_mv_init(void) {
+  av1_tokens_from_tree(mv_joint_encodings, av1_mv_joint_tree);
+  av1_tokens_from_tree(mv_class_encodings, av1_mv_class_tree);
+  av1_tokens_from_tree(mv_fp_encodings, av1_mv_fp_tree);
+}
+
+static void encode_mv_component(aom_writer *w, int comp, nmv_component *mvcomp,
+                                int usehp) {
+  int offset;
+  const int sign = comp < 0;
+  const int mag = sign ? -comp : comp;
+  const int mv_class = av1_get_mv_class(mag - 1, &offset);
+  const int d = offset >> 3;         // int mv data
+  const int fr = (offset >> 1) & 3;  // fractional mv data
+  const int hp = offset & 1;         // high precision mv data
+
+  assert(comp != 0);
+
+  // Sign
+  aom_write(w, sign, mvcomp->sign);
+
+// Class
+#if CONFIG_EC_MULTISYMBOL
+  aom_write_symbol(w, mv_class, mvcomp->class_cdf, MV_CLASSES);
+#else
+  av1_write_token(w, av1_mv_class_tree, mvcomp->classes,
+                  &mv_class_encodings[mv_class]);
+#endif
+
+  // Integer bits
+  if (mv_class == MV_CLASS_0) {
+    aom_write(w, d, mvcomp->class0[0]);
+  } else {
+    int i;
+    const int n = mv_class + CLASS0_BITS - 1;  // number of bits
+    for (i = 0; i < n; ++i) aom_write(w, (d >> i) & 1, mvcomp->bits[i]);
+  }
+
+// Fractional bits
+#if CONFIG_EC_MULTISYMBOL
+  aom_write_symbol(
+      w, fr, mv_class == MV_CLASS_0 ? mvcomp->class0_fp_cdf[d] : mvcomp->fp_cdf,
+      MV_FP_SIZE);
+#else
+  av1_write_token(w, av1_mv_fp_tree,
+                  mv_class == MV_CLASS_0 ? mvcomp->class0_fp[d] : mvcomp->fp,
+                  &mv_fp_encodings[fr]);
+#endif
+
+  // High precision bit
+  if (usehp)
+    aom_write(w, hp, mv_class == MV_CLASS_0 ? mvcomp->class0_hp : mvcomp->hp);
+}
+
+static void build_nmv_component_cost_table(int *mvcost,
+                                           const nmv_component *const mvcomp,
+                                           int usehp) {
+  int i, v;
+  int sign_cost[2], class_cost[MV_CLASSES], class0_cost[CLASS0_SIZE];
+  int bits_cost[MV_OFFSET_BITS][2];
+  int class0_fp_cost[CLASS0_SIZE][MV_FP_SIZE], fp_cost[MV_FP_SIZE];
+  int class0_hp_cost[2], hp_cost[2];
+
+  sign_cost[0] = av1_cost_zero(mvcomp->sign);
+  sign_cost[1] = av1_cost_one(mvcomp->sign);
+  av1_cost_tokens(class_cost, mvcomp->classes, av1_mv_class_tree);
+  av1_cost_tokens(class0_cost, mvcomp->class0, av1_mv_class0_tree);
+  for (i = 0; i < MV_OFFSET_BITS; ++i) {
+    bits_cost[i][0] = av1_cost_zero(mvcomp->bits[i]);
+    bits_cost[i][1] = av1_cost_one(mvcomp->bits[i]);
+  }
+
+  for (i = 0; i < CLASS0_SIZE; ++i)
+    av1_cost_tokens(class0_fp_cost[i], mvcomp->class0_fp[i], av1_mv_fp_tree);
+  av1_cost_tokens(fp_cost, mvcomp->fp, av1_mv_fp_tree);
+
+  if (usehp) {
+    class0_hp_cost[0] = av1_cost_zero(mvcomp->class0_hp);
+    class0_hp_cost[1] = av1_cost_one(mvcomp->class0_hp);
+    hp_cost[0] = av1_cost_zero(mvcomp->hp);
+    hp_cost[1] = av1_cost_one(mvcomp->hp);
+  }
+  mvcost[0] = 0;
+  for (v = 1; v <= MV_MAX; ++v) {
+    int z, c, o, d, e, f, cost = 0;
+    z = v - 1;
+    c = av1_get_mv_class(z, &o);
+    cost += class_cost[c];
+    d = (o >> 3);     /* int mv data */
+    f = (o >> 1) & 3; /* fractional pel mv data */
+    e = (o & 1);      /* high precision mv data */
+    if (c == MV_CLASS_0) {
+      cost += class0_cost[d];
+    } else {
+      const int b = c + CLASS0_BITS - 1; /* number of bits */
+      for (i = 0; i < b; ++i) cost += bits_cost[i][((d >> i) & 1)];
+    }
+    if (c == MV_CLASS_0) {
+      cost += class0_fp_cost[d][f];
+    } else {
+      cost += fp_cost[f];
+    }
+    if (usehp) {
+      if (c == MV_CLASS_0) {
+        cost += class0_hp_cost[e];
+      } else {
+        cost += hp_cost[e];
+      }
+    }
+    mvcost[v] = cost + sign_cost[0];
+    mvcost[-v] = cost + sign_cost[1];
+  }
+}
+
+static void update_mv(aom_writer *w, const unsigned int ct[2], aom_prob *cur_p,
+                      aom_prob upd_p) {
+  (void)upd_p;
+#if CONFIG_TILE_GROUPS
+  // Just use the default maximum number of tile groups to avoid passing in the
+  // actual
+  // number
+  av1_cond_prob_diff_update(w, cur_p, ct, DEFAULT_MAX_NUM_TG);
+#else
+  av1_cond_prob_diff_update(w, cur_p, ct, 1);
+#endif
+}
+
+#if !CONFIG_EC_ADAPT
+static void write_mv_update(const aom_tree_index *tree,
+                            aom_prob probs[/*n - 1*/],
+                            const unsigned int counts[/*n - 1*/], int n,
+                            aom_writer *w) {
+  int i;
+  unsigned int branch_ct[32][2];
+
+  // Assuming max number of probabilities <= 32
+  assert(n <= 32);
+
+  av1_tree_probs_from_distribution(tree, branch_ct, counts);
+  for (i = 0; i < n - 1; ++i)
+    update_mv(w, branch_ct[i], &probs[i], MV_UPDATE_PROB);
+}
+#endif
+
+void av1_write_nmv_probs(AV1_COMMON *cm, int usehp, aom_writer *w,
+                         nmv_context_counts *const nmv_counts) {
+  int i;
+#if CONFIG_REF_MV
+  int nmv_ctx = 0;
+  for (nmv_ctx = 0; nmv_ctx < NMV_CONTEXTS; ++nmv_ctx) {
+    nmv_context *const mvc = &cm->fc->nmvc[nmv_ctx];
+    nmv_context_counts *const counts = &nmv_counts[nmv_ctx];
+#if !CONFIG_EC_ADAPT
+    write_mv_update(av1_mv_joint_tree, mvc->joints, counts->joints, MV_JOINTS,
+                    w);
+
+    for (i = 0; i < 2; ++i) {
+      int j;
+      nmv_component *comp = &mvc->comps[i];
+      nmv_component_counts *comp_counts = &counts->comps[i];
+
+      update_mv(w, comp_counts->sign, &comp->sign, MV_UPDATE_PROB);
+      write_mv_update(av1_mv_class_tree, comp->classes, comp_counts->classes,
+                      MV_CLASSES, w);
+      write_mv_update(av1_mv_class0_tree, comp->class0, comp_counts->class0,
+                      CLASS0_SIZE, w);
+      for (j = 0; j < MV_OFFSET_BITS; ++j)
+        update_mv(w, comp_counts->bits[j], &comp->bits[j], MV_UPDATE_PROB);
+    }
+
+    for (i = 0; i < 2; ++i) {
+      int j;
+      for (j = 0; j < CLASS0_SIZE; ++j)
+        write_mv_update(av1_mv_fp_tree, mvc->comps[i].class0_fp[j],
+                        counts->comps[i].class0_fp[j], MV_FP_SIZE, w);
+
+      write_mv_update(av1_mv_fp_tree, mvc->comps[i].fp, counts->comps[i].fp,
+                      MV_FP_SIZE, w);
+    }
+#endif
+
+    if (usehp) {
+      for (i = 0; i < 2; ++i) {
+        update_mv(w, counts->comps[i].class0_hp, &mvc->comps[i].class0_hp,
+                  MV_UPDATE_PROB);
+        update_mv(w, counts->comps[i].hp, &mvc->comps[i].hp, MV_UPDATE_PROB);
+      }
+    }
+  }
+#else
+  nmv_context *const mvc = &cm->fc->nmvc;
+  nmv_context_counts *const counts = nmv_counts;
+
+#if !CONFIG_EC_ADAPT
+  write_mv_update(av1_mv_joint_tree, mvc->joints, counts->joints, MV_JOINTS, w);
+
+  for (i = 0; i < 2; ++i) {
+    int j;
+    nmv_component *comp = &mvc->comps[i];
+    nmv_component_counts *comp_counts = &counts->comps[i];
+
+    update_mv(w, comp_counts->sign, &comp->sign, MV_UPDATE_PROB);
+    write_mv_update(av1_mv_class_tree, comp->classes, comp_counts->classes,
+                    MV_CLASSES, w);
+    write_mv_update(av1_mv_class0_tree, comp->class0, comp_counts->class0,
+                    CLASS0_SIZE, w);
+    for (j = 0; j < MV_OFFSET_BITS; ++j)
+      update_mv(w, comp_counts->bits[j], &comp->bits[j], MV_UPDATE_PROB);
+  }
+
+  for (i = 0; i < 2; ++i) {
+    int j;
+    for (j = 0; j < CLASS0_SIZE; ++j) {
+      write_mv_update(av1_mv_fp_tree, mvc->comps[i].class0_fp[j],
+                      counts->comps[i].class0_fp[j], MV_FP_SIZE, w);
+    }
+    write_mv_update(av1_mv_fp_tree, mvc->comps[i].fp, counts->comps[i].fp,
+                    MV_FP_SIZE, w);
+  }
+#endif  // !CONFIG_EC_ADAPT
+
+  if (usehp) {
+    for (i = 0; i < 2; ++i) {
+      update_mv(w, counts->comps[i].class0_hp, &mvc->comps[i].class0_hp,
+                MV_UPDATE_PROB);
+      update_mv(w, counts->comps[i].hp, &mvc->comps[i].hp, MV_UPDATE_PROB);
+    }
+  }
+#endif
+}
+
+void av1_encode_mv(AV1_COMP *cpi, aom_writer *w, const MV *mv, const MV *ref,
+                   nmv_context *mvctx, int usehp) {
+  const MV diff = { mv->row - ref->row, mv->col - ref->col };
+  const MV_JOINT_TYPE j = av1_get_mv_joint(&diff);
+#if CONFIG_EC_MULTISYMBOL
+  aom_write_symbol(w, j, mvctx->joint_cdf, MV_JOINTS);
+#else
+  av1_write_token(w, av1_mv_joint_tree, mvctx->joints, &mv_joint_encodings[j]);
+#endif
+  if (mv_joint_vertical(j))
+    encode_mv_component(w, diff.row, &mvctx->comps[0], usehp);
+
+  if (mv_joint_horizontal(j))
+    encode_mv_component(w, diff.col, &mvctx->comps[1], usehp);
+
+  // If auto_mv_step_size is enabled then keep track of the largest
+  // motion vector component used.
+  if (cpi->sf.mv.auto_mv_step_size) {
+    unsigned int maxv = AOMMAX(abs(mv->row), abs(mv->col)) >> 3;
+    cpi->max_mv_magnitude = AOMMAX(maxv, cpi->max_mv_magnitude);
+  }
+}
+
+#if CONFIG_INTRABC
+void av1_encode_dv(aom_writer *w, const MV *mv, const MV *ref,
+                   nmv_context *mvctx) {
+  const MV diff = { mv->row - ref->row, mv->col - ref->col };
+  const MV_JOINT_TYPE j = av1_get_mv_joint(&diff);
+
+#if CONFIG_EC_MULTISYMBOL
+  aom_write_symbol(w, j, mvctx->joint_cdf, MV_JOINTS);
+#else
+  av1_write_token(w, av1_mv_joint_tree, mvctx->joints, &mv_joint_encodings[j]);
+#endif
+  if (mv_joint_vertical(j))
+    encode_mv_component(w, diff.row, &mvctx->comps[0], 0);
+
+  if (mv_joint_horizontal(j))
+    encode_mv_component(w, diff.col, &mvctx->comps[1], 0);
+}
+#endif  // CONFIG_INTRABC
+
+void av1_build_nmv_cost_table(int *mvjoint, int *mvcost[2],
+                              const nmv_context *ctx, int usehp) {
+  av1_cost_tokens(mvjoint, ctx->joints, av1_mv_joint_tree);
+  build_nmv_component_cost_table(mvcost[0], &ctx->comps[0], usehp);
+  build_nmv_component_cost_table(mvcost[1], &ctx->comps[1], usehp);
+}
+
+#if CONFIG_EXT_INTER
+static void inc_mvs(const MB_MODE_INFO *mbmi, const MB_MODE_INFO_EXT *mbmi_ext,
+                    const int_mv mvs[2],
+#if CONFIG_REF_MV
+                    const int_mv pred_mvs[2],
+#endif
+                    nmv_context_counts *nmv_counts) {
+  int i;
+  PREDICTION_MODE mode = mbmi->mode;
+#if !CONFIG_REF_MV
+  nmv_context_counts *counts = nmv_counts;
+#endif
+
+  if (mode == NEWMV || mode == NEW_NEWMV) {
+    for (i = 0; i < 1 + has_second_ref(mbmi); ++i) {
+      const MV *ref = &mbmi_ext->ref_mvs[mbmi->ref_frame[i]][0].as_mv;
+      const MV diff = { mvs[i].as_mv.row - ref->row,
+                        mvs[i].as_mv.col - ref->col };
+#if CONFIG_REF_MV
+      int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
+      int nmv_ctx =
+          av1_nmv_ctx(mbmi_ext->ref_mv_count[rf_type],
+                      mbmi_ext->ref_mv_stack[rf_type], i, mbmi->ref_mv_idx);
+      nmv_context_counts *counts = &nmv_counts[nmv_ctx];
+      (void)pred_mvs;
+#endif
+      av1_inc_mv(&diff, counts, 1);
+    }
+  } else if (mode == NEAREST_NEWMV || mode == NEAR_NEWMV) {
+    const MV *ref = &mbmi_ext->ref_mvs[mbmi->ref_frame[1]][0].as_mv;
+    const MV diff = { mvs[1].as_mv.row - ref->row,
+                      mvs[1].as_mv.col - ref->col };
+#if CONFIG_REF_MV
+    int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
+    int nmv_ctx =
+        av1_nmv_ctx(mbmi_ext->ref_mv_count[rf_type],
+                    mbmi_ext->ref_mv_stack[rf_type], 1, mbmi->ref_mv_idx);
+    nmv_context_counts *counts = &nmv_counts[nmv_ctx];
+#endif
+    av1_inc_mv(&diff, counts, 1);
+  } else if (mode == NEW_NEARESTMV || mode == NEW_NEARMV) {
+    const MV *ref = &mbmi_ext->ref_mvs[mbmi->ref_frame[0]][0].as_mv;
+    const MV diff = { mvs[0].as_mv.row - ref->row,
+                      mvs[0].as_mv.col - ref->col };
+#if CONFIG_REF_MV
+    int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
+    int nmv_ctx =
+        av1_nmv_ctx(mbmi_ext->ref_mv_count[rf_type],
+                    mbmi_ext->ref_mv_stack[rf_type], 0, mbmi->ref_mv_idx);
+    nmv_context_counts *counts = &nmv_counts[nmv_ctx];
+#endif
+    av1_inc_mv(&diff, counts, 1);
+  }
+}
+
+static void inc_mvs_sub8x8(const MODE_INFO *mi, int block, const int_mv mvs[2],
+#if CONFIG_REF_MV
+                           const MB_MODE_INFO_EXT *mbmi_ext,
+#endif
+                           nmv_context_counts *nmv_counts) {
+  int i;
+  PREDICTION_MODE mode = mi->bmi[block].as_mode;
+#if CONFIG_REF_MV
+  const MB_MODE_INFO *mbmi = &mi->mbmi;
+#else
+  nmv_context_counts *counts = nmv_counts;
+#endif
+
+  if (mode == NEWMV || mode == NEW_NEWMV) {
+    for (i = 0; i < 1 + has_second_ref(&mi->mbmi); ++i) {
+      const MV *ref = &mi->bmi[block].ref_mv[i].as_mv;
+      const MV diff = { mvs[i].as_mv.row - ref->row,
+                        mvs[i].as_mv.col - ref->col };
+#if CONFIG_REF_MV
+      int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
+      int nmv_ctx =
+          av1_nmv_ctx(mbmi_ext->ref_mv_count[rf_type],
+                      mbmi_ext->ref_mv_stack[rf_type], i, mbmi->ref_mv_idx);
+      nmv_context_counts *counts = &nmv_counts[nmv_ctx];
+#endif
+      av1_inc_mv(&diff, counts, 1);
+    }
+  } else if (mode == NEAREST_NEWMV || mode == NEAR_NEWMV) {
+    const MV *ref = &mi->bmi[block].ref_mv[1].as_mv;
+    const MV diff = { mvs[1].as_mv.row - ref->row,
+                      mvs[1].as_mv.col - ref->col };
+#if CONFIG_REF_MV
+    int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
+    int nmv_ctx =
+        av1_nmv_ctx(mbmi_ext->ref_mv_count[rf_type],
+                    mbmi_ext->ref_mv_stack[rf_type], 1, mbmi->ref_mv_idx);
+    nmv_context_counts *counts = &nmv_counts[nmv_ctx];
+#endif
+    av1_inc_mv(&diff, counts, 1);
+  } else if (mode == NEW_NEARESTMV || mode == NEW_NEARMV) {
+    const MV *ref = &mi->bmi[block].ref_mv[0].as_mv;
+    const MV diff = { mvs[0].as_mv.row - ref->row,
+                      mvs[0].as_mv.col - ref->col };
+#if CONFIG_REF_MV
+    int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
+    int nmv_ctx =
+        av1_nmv_ctx(mbmi_ext->ref_mv_count[rf_type],
+                    mbmi_ext->ref_mv_stack[rf_type], 0, mbmi->ref_mv_idx);
+    nmv_context_counts *counts = &nmv_counts[nmv_ctx];
+#endif
+    av1_inc_mv(&diff, counts, 1);
+  }
+}
+#else
+static void inc_mvs(const MB_MODE_INFO *mbmi, const MB_MODE_INFO_EXT *mbmi_ext,
+                    const int_mv mvs[2],
+#if CONFIG_REF_MV
+                    const int_mv pred_mvs[2],
+#endif
+                    nmv_context_counts *nmv_counts) {
+  int i;
+#if !CONFIG_REF_MV
+  nmv_context_counts *counts = nmv_counts;
+#endif
+
+  for (i = 0; i < 1 + has_second_ref(mbmi); ++i) {
+#if CONFIG_REF_MV
+    int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
+    int nmv_ctx =
+        av1_nmv_ctx(mbmi_ext->ref_mv_count[rf_type],
+                    mbmi_ext->ref_mv_stack[rf_type], i, mbmi->ref_mv_idx);
+    nmv_context_counts *counts = &nmv_counts[nmv_ctx];
+    const MV *ref = &pred_mvs[i].as_mv;
+#else
+    const MV *ref = &mbmi_ext->ref_mvs[mbmi->ref_frame[i]][0].as_mv;
+#endif
+    const MV diff = { mvs[i].as_mv.row - ref->row,
+                      mvs[i].as_mv.col - ref->col };
+    av1_inc_mv(&diff, counts, 1);
+  }
+}
+#endif  // CONFIG_EXT_INTER
+
+void av1_update_mv_count(ThreadData *td) {
+  const MACROBLOCKD *xd = &td->mb.e_mbd;
+  const MODE_INFO *mi = xd->mi[0];
+  const MB_MODE_INFO *const mbmi = &mi->mbmi;
+  const MB_MODE_INFO_EXT *mbmi_ext = td->mb.mbmi_ext;
+#if CONFIG_CB4X4
+  const int unify_bsize = 1;
+#else
+  const int unify_bsize = 0;
+#endif
+
+  if (mbmi->sb_type < BLOCK_8X8 && !unify_bsize) {
+    const int num_4x4_w = num_4x4_blocks_wide_lookup[mbmi->sb_type];
+    const int num_4x4_h = num_4x4_blocks_high_lookup[mbmi->sb_type];
+    int idx, idy;
+
+    for (idy = 0; idy < 2; idy += num_4x4_h) {
+      for (idx = 0; idx < 2; idx += num_4x4_w) {
+        const int i = idy * 2 + idx;
+
+#if CONFIG_EXT_INTER
+        if (have_newmv_in_inter_mode(mi->bmi[i].as_mode))
+          inc_mvs_sub8x8(mi, i, mi->bmi[i].as_mv,
+#if CONFIG_REF_MV
+                         mbmi_ext, td->counts->mv);
+#else
+                         &td->counts->mv);
+#endif
+#else
+        if (mi->bmi[i].as_mode == NEWMV)
+          inc_mvs(mbmi, mbmi_ext, mi->bmi[i].as_mv,
+#if CONFIG_REF_MV
+                  mi->bmi[i].pred_mv, td->counts->mv);
+#else
+                  &td->counts->mv);
+#endif
+#endif  // CONFIG_EXT_INTER
+      }
+    }
+  } else {
+#if CONFIG_EXT_INTER
+    if (have_newmv_in_inter_mode(mbmi->mode))
+#else
+    if (mbmi->mode == NEWMV)
+#endif  // CONFIG_EXT_INTER
+      inc_mvs(mbmi, mbmi_ext, mbmi->mv,
+#if CONFIG_REF_MV
+              mbmi->pred_mv, td->counts->mv);
+#else
+              &td->counts->mv);
+#endif
+  }
+}