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vp9_ethread: allocate frame contexts outside VP9_COMMON struct

This patch allocated frame contexts outside VP9_COMMON. This allows
multiple threads to share the same copy of frame contexts, and
reduces the overhead. It also guarantees the correct update of
these contexts during bitstream packing. This patch doesn't change
encoding result.

Change-Id: Ic181a2460b891d1d587278a6d02d8057b9dbd353

--- a/vp9/common/vp9_entropy.c

+++ b/vp9/common/vp9_entropy.c

@@ -748,10 +748,10 @@

 }

 void vp9_default_coef_probs(VP9_COMMON *cm) {

-  vp9_copy(cm->fc.coef_probs[TX_4X4], default_coef_probs_4x4);

-  vp9_copy(cm->fc.coef_probs[TX_8X8], default_coef_probs_8x8);

-  vp9_copy(cm->fc.coef_probs[TX_16X16], default_coef_probs_16x16);

-  vp9_copy(cm->fc.coef_probs[TX_32X32], default_coef_probs_32x32);

+  vp9_copy(cm->fc->coef_probs[TX_4X4], default_coef_probs_4x4);

+  vp9_copy(cm->fc->coef_probs[TX_8X8], default_coef_probs_8x8);

+  vp9_copy(cm->fc->coef_probs[TX_16X16], default_coef_probs_16x16);

+  vp9_copy(cm->fc->coef_probs[TX_32X32], default_coef_probs_32x32);

 }

 #define COEF_COUNT_SAT 24

@@ -765,7 +765,7 @@

                              unsigned int count_sat,

                              unsigned int update_factor) {

   const FRAME_CONTEXT *pre_fc = &cm->frame_contexts[cm->frame_context_idx];

-  vp9_coeff_probs_model *const probs = cm->fc.coef_probs[tx_size];

+  vp9_coeff_probs_model *const probs = cm->fc->coef_probs[tx_size];

   const vp9_coeff_probs_model *const pre_probs = pre_fc->coef_probs[tx_size];

   vp9_coeff_count_model *counts = cm->counts.coef[tx_size];

   unsigned int (*eob_counts)[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS] =

--- a/vp9/common/vp9_entropymode.c

+++ b/vp9/common/vp9_entropymode.c

@@ -350,7 +350,7 @@

 void vp9_adapt_mode_probs(VP9_COMMON *cm) {

   int i, j;

-  FRAME_CONTEXT *fc = &cm->fc;

+  FRAME_CONTEXT *fc = cm->fc;

   const FRAME_CONTEXT *pre_fc = &cm->frame_contexts[cm->frame_context_idx];

   const FRAME_COUNTS *counts = &cm->counts;

@@ -451,7 +451,7 @@

   lf->last_sharpness_level = -1;

   vp9_default_coef_probs(cm);

-  vp9_init_mode_probs(&cm->fc);

+  vp9_init_mode_probs(cm->fc);

   vp9_init_mv_probs(cm);

   if (cm->frame_type == KEY_FRAME ||

@@ -458,10 +458,10 @@

       cm->error_resilient_mode || cm->reset_frame_context == 3) {

     // Reset all frame contexts.

     for (i = 0; i < FRAME_CONTEXTS; ++i)

-      cm->frame_contexts[i] = cm->fc;

+      cm->frame_contexts[i] = *cm->fc;

   } else if (cm->reset_frame_context == 2) {

     // Reset only the frame context specified in the frame header.

-    cm->frame_contexts[cm->frame_context_idx] = cm->fc;

+    cm->frame_contexts[cm->frame_context_idx] = *cm->fc;

   }

   if (frame_is_intra_only(cm))

--- a/vp9/common/vp9_entropymv.c

+++ b/vp9/common/vp9_entropymv.c

@@ -196,7 +196,7 @@

 void vp9_adapt_mv_probs(VP9_COMMON *cm, int allow_hp) {

   int i, j;

-  nmv_context *fc = &cm->fc.nmvc;

+  nmv_context *fc = &cm->fc->nmvc;

   const nmv_context *pre_fc = &cm->frame_contexts[cm->frame_context_idx].nmvc;

   const nmv_context_counts *counts = &cm->counts.mv;

@@ -229,5 +229,5 @@

 }

 void vp9_init_mv_probs(VP9_COMMON *cm) {

-  cm->fc.nmvc = default_nmv_context;

+  cm->fc->nmvc = default_nmv_context;

 }

--- a/vp9/common/vp9_onyxc_int.h

+++ b/vp9/common/vp9_onyxc_int.h

@@ -169,8 +169,8 @@

   MV_REFERENCE_FRAME comp_var_ref[2];

   REFERENCE_MODE reference_mode;

-  FRAME_CONTEXT fc;  /* this frame entropy */

-  FRAME_CONTEXT frame_contexts[FRAME_CONTEXTS];

+  FRAME_CONTEXT *fc;  /* this frame entropy */

+  FRAME_CONTEXT *frame_contexts;   // FRAME_CONTEXTS

   unsigned int  frame_context_idx; /* Context to use/update */

   FRAME_COUNTS counts;

@@ -261,7 +261,7 @@

 static INLINE const vp9_prob* get_partition_probs(const VP9_COMMON *cm,

                                                   int ctx) {

   return frame_is_intra_only(cm) ? vp9_kf_partition_probs[ctx]

-                                 : cm->fc.partition_prob[ctx];

+                                 : cm->fc->partition_prob[ctx];

 }

 static INLINE void set_skip_context(MACROBLOCKD *xd, int mi_row, int mi_col) {

--- a/vp9/common/vp9_pred_common.h

+++ b/vp9/common/vp9_pred_common.h

@@ -54,7 +54,7 @@

 static INLINE vp9_prob vp9_get_skip_prob(const VP9_COMMON *cm,

                                          const MACROBLOCKD *xd) {

-  return cm->fc.skip_probs[vp9_get_skip_context(xd)];

+  return cm->fc->skip_probs[vp9_get_skip_context(xd)];

 }

 int vp9_get_pred_context_switchable_interp(const MACROBLOCKD *xd);

@@ -63,7 +63,7 @@

 static INLINE vp9_prob vp9_get_intra_inter_prob(const VP9_COMMON *cm,

                                                 const MACROBLOCKD *xd) {

-  return cm->fc.intra_inter_prob[vp9_get_intra_inter_context(xd)];

+  return cm->fc->intra_inter_prob[vp9_get_intra_inter_context(xd)];

 }

 int vp9_get_reference_mode_context(const VP9_COMMON *cm, const MACROBLOCKD *xd);

@@ -70,7 +70,7 @@

 static INLINE vp9_prob vp9_get_reference_mode_prob(const VP9_COMMON *cm,

                                                    const MACROBLOCKD *xd) {

-  return cm->fc.comp_inter_prob[vp9_get_reference_mode_context(cm, xd)];

+  return cm->fc->comp_inter_prob[vp9_get_reference_mode_context(cm, xd)];

 }

 int vp9_get_pred_context_comp_ref_p(const VP9_COMMON *cm,

@@ -79,7 +79,7 @@

 static INLINE vp9_prob vp9_get_pred_prob_comp_ref_p(const VP9_COMMON *cm,

                                                     const MACROBLOCKD *xd) {

   const int pred_context = vp9_get_pred_context_comp_ref_p(cm, xd);

-  return cm->fc.comp_ref_prob[pred_context];

+  return cm->fc->comp_ref_prob[pred_context];

 }

 int vp9_get_pred_context_single_ref_p1(const MACROBLOCKD *xd);

@@ -86,7 +86,7 @@

 static INLINE vp9_prob vp9_get_pred_prob_single_ref_p1(const VP9_COMMON *cm,

                                                        const MACROBLOCKD *xd) {

-  return cm->fc.single_ref_prob[vp9_get_pred_context_single_ref_p1(xd)][0];

+  return cm->fc->single_ref_prob[vp9_get_pred_context_single_ref_p1(xd)][0];

 }

 int vp9_get_pred_context_single_ref_p2(const MACROBLOCKD *xd);

@@ -93,7 +93,7 @@

 static INLINE vp9_prob vp9_get_pred_prob_single_ref_p2(const VP9_COMMON *cm,

                                                        const MACROBLOCKD *xd) {

-  return cm->fc.single_ref_prob[vp9_get_pred_context_single_ref_p2(xd)][1];

+  return cm->fc->single_ref_prob[vp9_get_pred_context_single_ref_p2(xd)][1];

 }

 int vp9_get_tx_size_context(const MACROBLOCKD *xd);

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -127,7 +127,7 @@

 }

 static void read_frame_reference_mode_probs(VP9_COMMON *cm, vp9_reader *r) {

-  FRAME_CONTEXT *const fc = &cm->fc;

+  FRAME_CONTEXT *const fc = cm->fc;

   int i;

   if (cm->reference_mode == REFERENCE_MODE_SELECT)

@@ -1386,7 +1386,7 @@

                                   size_t partition_size) {

   VP9_COMMON *const cm = &pbi->common;

   MACROBLOCKD *const xd = &pbi->mb;

-  FRAME_CONTEXT *const fc = &cm->fc;

+  FRAME_CONTEXT *const fc = cm->fc;

   vp9_reader r;

   int k;

@@ -1540,7 +1540,7 @@

   setup_plane_dequants(cm, xd, cm->base_qindex);

   vp9_setup_block_planes(xd, cm->subsampling_x, cm->subsampling_y);

-  cm->fc = cm->frame_contexts[cm->frame_context_idx];

+  *cm->fc = cm->frame_contexts[cm->frame_context_idx];

   vp9_zero(cm->counts);

   vp9_zero(xd->dqcoeff);

@@ -1580,5 +1580,5 @@

   }

   if (cm->refresh_frame_context)

-    cm->frame_contexts[cm->frame_context_idx] = cm->fc;

+    cm->frame_contexts[cm->frame_context_idx] = *cm->fc;

 }

--- a/vp9/decoder/vp9_decodemv.c

+++ b/vp9/decoder/vp9_decodemv.c

@@ -30,7 +30,7 @@

 static PREDICTION_MODE read_intra_mode_y(VP9_COMMON *cm, vp9_reader *r,

                                             int size_group) {

   const PREDICTION_MODE y_mode =

-      read_intra_mode(r, cm->fc.y_mode_prob[size_group]);

+      read_intra_mode(r, cm->fc->y_mode_prob[size_group]);

   if (!cm->frame_parallel_decoding_mode)

     ++cm->counts.y_mode[size_group][y_mode];

   return y_mode;

@@ -39,7 +39,7 @@

 static PREDICTION_MODE read_intra_mode_uv(VP9_COMMON *cm, vp9_reader *r,

                                           PREDICTION_MODE y_mode) {

   const PREDICTION_MODE uv_mode = read_intra_mode(r,

-                                         cm->fc.uv_mode_prob[y_mode]);

+                                         cm->fc->uv_mode_prob[y_mode]);

   if (!cm->frame_parallel_decoding_mode)

     ++cm->counts.uv_mode[y_mode][uv_mode];

   return uv_mode;

@@ -47,7 +47,7 @@

 static PREDICTION_MODE read_inter_mode(VP9_COMMON *cm, vp9_reader *r, int ctx) {

   const int mode = vp9_read_tree(r, vp9_inter_mode_tree,

-                                 cm->fc.inter_mode_probs[ctx]);

+                                 cm->fc->inter_mode_probs[ctx]);

   if (!cm->frame_parallel_decoding_mode)

     ++cm->counts.inter_mode[ctx][mode];

@@ -61,7 +61,7 @@

 static TX_SIZE read_selected_tx_size(VP9_COMMON *cm, MACROBLOCKD *xd,

                                      TX_SIZE max_tx_size, vp9_reader *r) {

   const int ctx = vp9_get_tx_size_context(xd);

-  const vp9_prob *tx_probs = get_tx_probs(max_tx_size, ctx, &cm->fc.tx_probs);

+  const vp9_prob *tx_probs = get_tx_probs(max_tx_size, ctx, &cm->fc->tx_probs);

   int tx_size = vp9_read(r, tx_probs[0]);

   if (tx_size != TX_4X4 && max_tx_size >= TX_16X16) {

     tx_size += vp9_read(r, tx_probs[1]);

@@ -150,7 +150,7 @@

     return 1;

   } else {

     const int ctx = vp9_get_skip_context(xd);

-    const int skip = vp9_read(r, cm->fc.skip_probs[ctx]);

+    const int skip = vp9_read(r, cm->fc->skip_probs[ctx]);

     if (!cm->frame_parallel_decoding_mode)

       ++cm->counts.skip[ctx][skip];

     return skip;

@@ -258,7 +258,7 @@

   if (cm->reference_mode == REFERENCE_MODE_SELECT) {

     const int ctx = vp9_get_reference_mode_context(cm, xd);

     const REFERENCE_MODE mode =

-        (REFERENCE_MODE)vp9_read(r, cm->fc.comp_inter_prob[ctx]);

+        (REFERENCE_MODE)vp9_read(r, cm->fc->comp_inter_prob[ctx]);

     if (!cm->frame_parallel_decoding_mode)

       ++cm->counts.comp_inter[ctx][mode];

     return mode;  // SINGLE_REFERENCE or COMPOUND_REFERENCE

@@ -271,7 +271,7 @@

 static void read_ref_frames(VP9_COMMON *const cm, MACROBLOCKD *const xd,

                             vp9_reader *r,

                             int segment_id, MV_REFERENCE_FRAME ref_frame[2]) {

-  FRAME_CONTEXT *const fc = &cm->fc;

+  FRAME_CONTEXT *const fc = cm->fc;

   FRAME_COUNTS *const counts = &cm->counts;

   if (vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {

@@ -317,7 +317,7 @@

   const int ctx = vp9_get_pred_context_switchable_interp(xd);

   const INTERP_FILTER type =

       (INTERP_FILTER)vp9_read_tree(r, vp9_switchable_interp_tree,

-                                   cm->fc.switchable_interp_prob[ctx]);

+                                   cm->fc->switchable_interp_prob[ctx]);

   if (!cm->frame_parallel_decoding_mode)

     ++cm->counts.switchable_interp[ctx][type];

   return type;

@@ -372,7 +372,7 @@

       nmv_context_counts *const mv_counts = cm->frame_parallel_decoding_mode ?

                                             NULL : &cm->counts.mv;

       for (i = 0; i < 1 + is_compound; ++i) {

-        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &cm->fc.nmvc, mv_counts,

+        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &cm->fc->nmvc, mv_counts,

                 allow_hp);

         ret = ret && is_mv_valid(&mv[i].as_mv);

       }

@@ -410,7 +410,7 @@

            INTRA_FRAME;

   } else {

     const int ctx = vp9_get_intra_inter_context(xd);

-    const int is_inter = vp9_read(r, cm->fc.intra_inter_prob[ctx]);

+    const int is_inter = vp9_read(r, cm->fc->intra_inter_prob[ctx]);

     if (!cm->frame_parallel_decoding_mode)

       ++cm->counts.intra_inter[ctx][is_inter];

     return is_inter;

--- a/vp9/decoder/vp9_decoder.c

+++ b/vp9/decoder/vp9_decoder.c

@@ -59,6 +59,13 @@

   }

   cm->error.setjmp = 1;

+

+  CHECK_MEM_ERROR(cm, cm->fc,

+                  (FRAME_CONTEXT *)vpx_calloc(1, sizeof(*cm->fc)));

+  CHECK_MEM_ERROR(cm, cm->frame_contexts,

+                  (FRAME_CONTEXT *)vpx_calloc(FRAME_CONTEXTS,

+                  sizeof(*cm->frame_contexts)));

+

   pbi->need_resync = 1;

   initialize_dec();

@@ -87,6 +94,11 @@

 void vp9_decoder_remove(VP9Decoder *pbi) {

   VP9_COMMON *const cm = &pbi->common;

   int i;

+

+  vpx_free(cm->fc);

+  cm->fc = NULL;

+  vpx_free(cm->frame_contexts);

+  cm->frame_contexts = NULL;

   vp9_get_worker_interface()->end(&pbi->lf_worker);

   vpx_free(pbi->lf_worker.data1);

--- a/vp9/decoder/vp9_detokenize.c

+++ b/vp9/decoder/vp9_detokenize.c

@@ -58,7 +58,7 @@

                         int ctx, const int16_t *scan, const int16_t *nb,

                         vp9_reader *r) {

   const int max_eob = 16 << (tx_size << 1);

-  const FRAME_CONTEXT *const fc = &cm->fc;

+  const FRAME_CONTEXT *const fc = cm->fc;

   FRAME_COUNTS *const counts = &cm->counts;

   const int ref = is_inter_block(&xd->mi[0].src_mi->mbmi);

   int band, c = 0;

--- a/vp9/encoder/vp9_bitstream.c

+++ b/vp9/encoder/vp9_bitstream.c

@@ -84,7 +84,7 @@

                                    vp9_writer *w) {

   const TX_SIZE max_tx_size = max_txsize_lookup[bsize];

   const vp9_prob *const tx_probs = get_tx_probs2(max_tx_size, xd,

-                                                 &cm->fc.tx_probs);

+                                                 &cm->fc->tx_probs);

   vp9_write(w, tx_size != TX_4X4, tx_probs[0]);

   if (tx_size != TX_4X4 && max_tx_size >= TX_16X16) {

     vp9_write(w, tx_size != TX_8X8, tx_probs[1]);

@@ -108,7 +108,7 @@

   int k;

   for (k = 0; k < SKIP_CONTEXTS; ++k)

-    vp9_cond_prob_diff_update(w, &cm->fc.skip_probs[k], cm->counts.skip[k]);

+    vp9_cond_prob_diff_update(w, &cm->fc->skip_probs[k], cm->counts.skip[k]);

 }

 static void update_switchable_interp_probs(VP9_COMMON *cm, vp9_writer *w) {

@@ -115,7 +115,7 @@

   int j;

   for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j)

     prob_diff_update(vp9_switchable_interp_tree,

-                     cm->fc.switchable_interp_prob[j],

+                     cm->fc->switchable_interp_prob[j],

                      cm->counts.switchable_interp[j], SWITCHABLE_FILTERS, w);

 }

@@ -237,7 +237,7 @@

 static void pack_inter_mode_mvs(VP9_COMP *cpi, const MODE_INFO *mi,

                                 vp9_writer *w) {

   VP9_COMMON *const cm = &cpi->common;

-  const nmv_context *nmvc = &cm->fc.nmvc;

+  const nmv_context *nmvc = &cm->fc->nmvc;

   const MACROBLOCK *const x = &cpi->mb;

   const MACROBLOCKD *const xd = &x->e_mbd;

   const struct segmentation *const seg = &cm->seg;

@@ -275,7 +275,7 @@

   if (!is_inter) {

     if (bsize >= BLOCK_8X8) {

-      write_intra_mode(w, mode, cm->fc.y_mode_prob[size_group_lookup[bsize]]);

+      write_intra_mode(w, mode, cm->fc->y_mode_prob[size_group_lookup[bsize]]);

     } else {

       int idx, idy;

       const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];

@@ -283,14 +283,14 @@

       for (idy = 0; idy < 2; idy += num_4x4_h) {

         for (idx = 0; idx < 2; idx += num_4x4_w) {

           const PREDICTION_MODE b_mode = mi->bmi[idy * 2 + idx].as_mode;

-          write_intra_mode(w, b_mode, cm->fc.y_mode_prob[0]);

+          write_intra_mode(w, b_mode, cm->fc->y_mode_prob[0]);

         }

       }

     }

-    write_intra_mode(w, mbmi->uv_mode, cm->fc.uv_mode_prob[mode]);

+    write_intra_mode(w, mbmi->uv_mode, cm->fc->uv_mode_prob[mode]);

   } else {

     const int mode_ctx = mbmi->mode_context[mbmi->ref_frame[0]];

-    const vp9_prob *const inter_probs = cm->fc.inter_mode_probs[mode_ctx];

+    const vp9_prob *const inter_probs = cm->fc->inter_mode_probs[mode_ctx];

     write_ref_frames(cm, xd, w);

     // If segment skip is not enabled code the mode.

@@ -304,7 +304,7 @@

     if (cm->interp_filter == SWITCHABLE) {

       const int ctx = vp9_get_pred_context_switchable_interp(xd);

       vp9_write_token(w, vp9_switchable_interp_tree,

-                      cm->fc.switchable_interp_prob[ctx],

+                      cm->fc->switchable_interp_prob[ctx],

                       &switchable_interp_encodings[mbmi->interp_filter]);

       ++cpi->interp_filter_selected[0][mbmi->interp_filter];

     } else {

@@ -528,7 +528,7 @@

                                      TX_SIZE tx_size,

                                      vp9_coeff_stats *frame_branch_ct,

                                      vp9_coeff_probs_model *new_coef_probs) {

-  vp9_coeff_probs_model *old_coef_probs = cpi->common.fc.coef_probs[tx_size];

+  vp9_coeff_probs_model *old_coef_probs = cpi->common.fc->coef_probs[tx_size];

   const vp9_prob upd = DIFF_UPDATE_PROB;

   const int entropy_nodes_update = UNCONSTRAINED_NODES;

   int i, j, k, l, t;

@@ -830,13 +830,13 @@

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

       tx_counts_to_branch_counts_8x8(cm->counts.tx.p8x8[i], ct_8x8p);

       for (j = 0; j < TX_SIZES - 3; j++)

-        vp9_cond_prob_diff_update(w, &cm->fc.tx_probs.p8x8[i][j], ct_8x8p[j]);

+        vp9_cond_prob_diff_update(w, &cm->fc->tx_probs.p8x8[i][j], ct_8x8p[j]);

     }

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

       tx_counts_to_branch_counts_16x16(cm->counts.tx.p16x16[i], ct_16x16p);

       for (j = 0; j < TX_SIZES - 2; j++)

-        vp9_cond_prob_diff_update(w, &cm->fc.tx_probs.p16x16[i][j],

+        vp9_cond_prob_diff_update(w, &cm->fc->tx_probs.p16x16[i][j],

                                   ct_16x16p[j]);

     }

@@ -843,7 +843,7 @@

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

       tx_counts_to_branch_counts_32x32(cm->counts.tx.p32x32[i], ct_32x32p);

       for (j = 0; j < TX_SIZES - 1; j++)

-        vp9_cond_prob_diff_update(w, &cm->fc.tx_probs.p32x32[i][j],

+        vp9_cond_prob_diff_update(w, &cm->fc->tx_probs.p32x32[i][j],

                                   ct_32x32p[j]);

     }

   }

@@ -1161,7 +1161,7 @@

 static size_t write_compressed_header(VP9_COMP *cpi, uint8_t *data) {

   VP9_COMMON *const cm = &cpi->common;

   MACROBLOCKD *const xd = &cpi->mb.e_mbd;

-  FRAME_CONTEXT *const fc = &cm->fc;

+  FRAME_CONTEXT *const fc = cm->fc;

   vp9_writer header_bc;

   vp9_start_encode(&header_bc, data);

@@ -1178,7 +1178,7 @@

     int i;

     for (i = 0; i < INTER_MODE_CONTEXTS; ++i)

-      prob_diff_update(vp9_inter_mode_tree, cm->fc.inter_mode_probs[i],

+      prob_diff_update(vp9_inter_mode_tree, cm->fc->inter_mode_probs[i],

                        cm->counts.inter_mode[i], INTER_MODES, &header_bc);

     vp9_zero(cm->counts.inter_mode);

@@ -1219,7 +1219,7 @@

                                   cm->counts.comp_ref[i]);

     for (i = 0; i < BLOCK_SIZE_GROUPS; ++i)

-      prob_diff_update(vp9_intra_mode_tree, cm->fc.y_mode_prob[i],

+      prob_diff_update(vp9_intra_mode_tree, cm->fc->y_mode_prob[i],

                        cm->counts.y_mode[i], INTRA_MODES, &header_bc);

     for (i = 0; i < PARTITION_CONTEXTS; ++i)

--- a/vp9/encoder/vp9_encodemv.c

+++ b/vp9/encoder/vp9_encodemv.c

@@ -163,7 +163,7 @@

 void vp9_write_nmv_probs(VP9_COMMON *cm, int usehp, vp9_writer *w) {

   int i, j;

-  nmv_context *const mvc = &cm->fc.nmvc;

+  nmv_context *const mvc = &cm->fc->nmvc;

   nmv_context_counts *const counts = &cm->counts.mv;

   write_mv_update(vp9_mv_joint_tree, mvc->joints, counts->joints, MV_JOINTS, w);

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -134,7 +134,7 @@

     cpi->refresh_alt_ref_frame = 1;

     vp9_zero(cpi->interp_filter_selected);

   } else {

-    cm->fc = cm->frame_contexts[cm->frame_context_idx];

+    *cm->fc = cm->frame_contexts[cm->frame_context_idx];

     vp9_zero(cpi->interp_filter_selected[0]);

   }

 }

@@ -160,6 +160,11 @@

   VP9_COMMON *const cm = &cpi->common;

   int i;

+  vpx_free(cm->fc);

+  cm->fc = NULL;

+  vpx_free(cm->frame_contexts);

+  cm->frame_contexts = NULL;

+

   // Delete sementation map

   vpx_free(cpi->segmentation_map);

   cpi->segmentation_map = NULL;

@@ -257,7 +262,7 @@

   vp9_copy(cc->last_ref_lf_deltas, cm->lf.last_ref_deltas);

   vp9_copy(cc->last_mode_lf_deltas, cm->lf.last_mode_deltas);

-  cc->fc = cm->fc;

+  cc->fc = *cm->fc;

 }

 static void restore_coding_context(VP9_COMP *cpi) {

@@ -286,7 +291,7 @@

   vp9_copy(cm->lf.last_ref_deltas, cc->last_ref_lf_deltas);

   vp9_copy(cm->lf.last_mode_deltas, cc->last_mode_lf_deltas);

-  cm->fc = cc->fc;

+  *cm->fc = cc->fc;

 }

 static void configure_static_seg_features(VP9_COMP *cpi) {

@@ -1374,6 +1379,12 @@

   cm->error.setjmp = 1;

+  CHECK_MEM_ERROR(cm, cm->fc,

+                  (FRAME_CONTEXT *)vpx_calloc(1, sizeof(*cm->fc)));

+  CHECK_MEM_ERROR(cm, cm->frame_contexts,

+                  (FRAME_CONTEXT *)vpx_calloc(FRAME_CONTEXTS,

+                  sizeof(*cm->frame_contexts)));

+

   cpi->use_svc = 0;

   init_config(cpi, oxcf);

@@ -3647,7 +3658,7 @@

   }

   if (cm->refresh_frame_context)

-    cm->frame_contexts[cm->frame_context_idx] = cm->fc;

+    cm->frame_contexts[cm->frame_context_idx] = *cm->fc;

   // Frame was dropped, release scaled references.

   if (*size == 0) {

--- a/vp9/encoder/vp9_rd.c

+++ b/vp9/encoder/vp9_rd.c

@@ -53,7 +53,7 @@

 };

 static void fill_mode_costs(VP9_COMP *cpi) {

-  const FRAME_CONTEXT *const fc = &cpi->common.fc;

+  const FRAME_CONTEXT *const fc = cpi->common.fc;

   int i, j;

   for (i = 0; i < INTRA_MODES; ++i)

@@ -268,7 +268,7 @@

   set_block_thresholds(cm, rd);

   if (!cpi->sf.use_nonrd_pick_mode || cm->frame_type == KEY_FRAME) {

-    fill_token_costs(x->token_costs, cm->fc.coef_probs);

+    fill_token_costs(x->token_costs, cm->fc->coef_probs);

     for (i = 0; i < PARTITION_CONTEXTS; ++i)

       vp9_cost_tokens(cpi->partition_cost[i], get_partition_probs(cm, i),

@@ -283,11 +283,11 @@

       vp9_build_nmv_cost_table(x->nmvjointcost,

                                cm->allow_high_precision_mv ? x->nmvcost_hp

                                                            : x->nmvcost,

-                               &cm->fc.nmvc, cm->allow_high_precision_mv);

+                               &cm->fc->nmvc, cm->allow_high_precision_mv);

       for (i = 0; i < INTER_MODE_CONTEXTS; ++i)

         vp9_cost_tokens((int *)cpi->inter_mode_cost[i],

-                        cm->fc.inter_mode_probs[i], vp9_inter_mode_tree);

+                        cm->fc->inter_mode_probs[i], vp9_inter_mode_tree);

     }

   }

 }

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -639,7 +639,7 @@

   int64_t best_rd = INT64_MAX;

   TX_SIZE best_tx = max_tx_size;

-  const vp9_prob *tx_probs = get_tx_probs2(max_tx_size, xd, &cm->fc.tx_probs);

+  const vp9_prob *tx_probs = get_tx_probs2(max_tx_size, xd, &cm->fc->tx_probs);

   assert(skip_prob > 0);

   s0 = vp9_cost_bit(skip_prob, 0);

   s1 = vp9_cost_bit(skip_prob, 1);

--- a/vp9/encoder/vp9_tokenize.c

+++ b/vp9/encoder/vp9_tokenize.c

@@ -313,7 +313,7 @@

   unsigned int (*const counts)[COEFF_CONTEXTS][ENTROPY_TOKENS] =

       cpi->coef_counts[tx_size][type][ref];

   vp9_prob (*const coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =

-      cpi->common.fc.coef_probs[tx_size][type][ref];

+      cpi->common.fc->coef_probs[tx_size][type][ref];

   unsigned int (*const eob_branch)[COEFF_CONTEXTS] =

       cpi->common.counts.eob_branch[tx_size][type][ref];

   const uint8_t *const band = get_band_translate(tx_size);

-- 

⑨