diff --git a/libavcodec/vp5.c b/libavcodec/vp5.c
index d590117f23..5441350069 100644
--- a/libavcodec/vp5.c
+++ b/libavcodec/vp5.c
@@ -88,16 +88,17 @@ static int vp5_adjust(int v, int t)
 static void vp5_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     int comp, di;
 
     for (comp=0; comp<2; comp++) {
         int delta = 0;
-        if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) {
-            int sign = vp56_rac_get_prob(c, s->vector_model_sig[comp]);
-            di  = vp56_rac_get_prob(c, s->vector_model_pdi[comp][0]);
-            di |= vp56_rac_get_prob(c, s->vector_model_pdi[comp][1]) << 1;
+        if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
+            int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
+            di  = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
+            di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
             delta = vp56_rac_get_tree(c, vp56_pva_tree,
-                                      s->vector_model_pdv[comp]);
+                                      model->vector_pdv[comp]);
             delta = di | (delta << 2);
             delta = (delta ^ -sign) + sign;
         }
@@ -111,28 +112,30 @@ static void vp5_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
 static void vp5_parse_vector_models(vp56_context_t *s)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     int comp, node;
 
     for (comp=0; comp<2; comp++) {
         if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0]))
-            s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7);
+            model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
         if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
-            s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7);
+            model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
         if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
-            s->vector_model_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
+            model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
         if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
-            s->vector_model_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
+            model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
     }
 
     for (comp=0; comp<2; comp++)
         for (node=0; node<7; node++)
             if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
-                s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
+                model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
 }
 
 static void vp5_parse_coeff_models(vp56_context_t *s)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     uint8_t def_prob[11];
     int node, cg, ctx;
     int ct;    /* code type */
@@ -144,9 +147,9 @@ static void vp5_parse_coeff_models(vp56_context_t *s)
         for (node=0; node<11; node++)
             if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) {
                 def_prob[node] = vp56_rac_gets_nn(c, 7);
-                s->coeff_model_dccv[pt][node] = def_prob[node];
+                model->coeff_dccv[pt][node] = def_prob[node];
             } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
-                s->coeff_model_dccv[pt][node] = def_prob[node];
+                model->coeff_dccv[pt][node] = def_prob[node];
             }
 
     for (ct=0; ct<3; ct++)
@@ -155,31 +158,32 @@ static void vp5_parse_coeff_models(vp56_context_t *s)
                 for (node=0; node<11; node++)
                     if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) {
                         def_prob[node] = vp56_rac_gets_nn(c, 7);
-                        s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
+                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
                     } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
-                        s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
+                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
                     }
 
-    /* coeff_model_dcct is a linear combination of coeff_model_dccv */
+    /* coeff_dcct is a linear combination of coeff_dccv */
     for (pt=0; pt<2; pt++)
         for (ctx=0; ctx<36; ctx++)
             for (node=0; node<5; node++)
-                s->coeff_model_dcct[pt][ctx][node] = av_clip(((s->coeff_model_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254);
+                model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254);
 
-    /* coeff_model_acct is a linear combination of coeff_model_ract */
+    /* coeff_acct is a linear combination of coeff_ract */
     for (ct=0; ct<3; ct++)
         for (pt=0; pt<2; pt++)
             for (cg=0; cg<3; cg++)
                 for (ctx=0; ctx<6; ctx++)
                     for (node=0; node<5; node++)
-                        s->coeff_model_acct[pt][ct][cg][ctx][node] = av_clip(((s->coeff_model_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254);
+                        model->coeff_acct[pt][ct][cg][ctx][node] = av_clip(((model->coeff_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254);
 }
 
 static void vp5_parse_coeff(vp56_context_t *s)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     uint8_t *permute = s->scantable.permutated;
-    uint8_t *model, *model2;
+    uint8_t *model1, *model2;
     int coeff, sign, coeff_idx;
     int b, i, cg, idx, ctx, ctx_last;
     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
@@ -191,22 +195,22 @@ static void vp5_parse_coeff(vp56_context_t *s)
 
         ctx = 6*s->coeff_ctx[vp56_b6to4[b]][0]
               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
-        model = s->coeff_model_dccv[pt];
-        model2 = s->coeff_model_dcct[pt][ctx];
+        model1 = model->coeff_dccv[pt];
+        model2 = model->coeff_dcct[pt][ctx];
 
         for (coeff_idx=0; coeff_idx<64; ) {
             if (vp56_rac_get_prob(c, model2[0])) {
                 if (vp56_rac_get_prob(c, model2[2])) {
                     if (vp56_rac_get_prob(c, model2[3])) {
                         s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 4;
-                        idx = vp56_rac_get_tree(c, vp56_pc_tree, model);
+                        idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
                         sign = vp56_rac_get(c);
                         coeff = vp56_coeff_bias[idx];
                         for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
                             coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
                     } else {
                         if (vp56_rac_get_prob(c, model2[4])) {
-                            coeff = 3 + vp56_rac_get_prob(c, model[5]);
+                            coeff = 3 + vp56_rac_get_prob(c, model1[5]);
                             s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 3;
                         } else {
                             coeff = 2;
@@ -234,8 +238,8 @@ static void vp5_parse_coeff(vp56_context_t *s)
 
             cg = vp5_coeff_groups[++coeff_idx];
             ctx = s->coeff_ctx[vp56_b6to4[b]][coeff_idx];
-            model = s->coeff_model_ract[pt][ct][cg];
-            model2 = cg > 2 ? model : s->coeff_model_acct[pt][ct][cg][ctx];
+            model1 = model->coeff_ract[pt][ct][cg];
+            model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
         }
 
         ctx_last = FFMIN(s->coeff_ctx_last[vp56_b6to4[b]], 24);
@@ -249,16 +253,17 @@ static void vp5_parse_coeff(vp56_context_t *s)
 
 static void vp5_default_models_init(vp56_context_t *s)
 {
+    vp56_model_t *model = s->modelp;
     int i;
 
     for (i=0; i<2; i++) {
-        s->vector_model_sig[i] = 0x80;
-        s->vector_model_dct[i] = 0x80;
-        s->vector_model_pdi[i][0] = 0x55;
-        s->vector_model_pdi[i][1] = 0x80;
+        model->vector_sig[i] = 0x80;
+        model->vector_dct[i] = 0x80;
+        model->vector_pdi[i][0] = 0x55;
+        model->vector_pdi[i][1] = 0x80;
     }
-    memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats));
-    memset(s->vector_model_pdv, 0x80, sizeof(s->vector_model_pdv));
+    memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
+    memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
 }
 
 static int vp5_decode_init(AVCodecContext *avctx)
diff --git a/libavcodec/vp56.c b/libavcodec/vp56.c
index 0858e84028..26c905f183 100644
--- a/libavcodec/vp56.c
+++ b/libavcodec/vp56.c
@@ -75,13 +75,15 @@ static int vp56_get_vectors_predictors(vp56_context_t *s, int row, int col,
 static void vp56_parse_mb_type_models(vp56_context_t *s)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     int i, ctx, type;
 
     for (ctx=0; ctx<3; ctx++) {
         if (vp56_rac_get_prob(c, 174)) {
             int idx = vp56_rac_gets(c, 4);
-            memcpy(s->mb_types_stats[ctx],vp56_pre_def_mb_type_stats[idx][ctx],
-                   sizeof(s->mb_types_stats[ctx]));
+            memcpy(model->mb_types_stats[ctx],
+                   vp56_pre_def_mb_type_stats[idx][ctx],
+                   sizeof(model->mb_types_stats[ctx]));
         }
         if (vp56_rac_get_prob(c, 254)) {
             for (type=0; type<10; type++) {
@@ -93,7 +95,7 @@ static void vp56_parse_mb_type_models(vp56_context_t *s)
                                                   vp56_mb_type_model_model);
                         if (!delta)
                             delta = 4 * vp56_rac_gets(c, 7);
-                        s->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
+                        model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
                     }
                 }
             }
@@ -105,13 +107,13 @@ static void vp56_parse_mb_type_models(vp56_context_t *s)
         int p[10];
 
         for (type=0; type<10; type++)
-            p[type] = 100 * s->mb_types_stats[ctx][type][1];
+            p[type] = 100 * model->mb_types_stats[ctx][type][1];
 
         for (type=0; type<10; type++) {
             int p02, p34, p0234, p17, p56, p89, p5689, p156789;
 
             /* conservative MB type probability */
-            s->mb_type_model[ctx][type][0] = 255 - (255 * s->mb_types_stats[ctx][type][0]) / (1 + s->mb_types_stats[ctx][type][0] + s->mb_types_stats[ctx][type][1]);
+            model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);
 
             p[type] = 0;    /* same MB type => weight is null */
 
@@ -125,18 +127,18 @@ static void vp56_parse_mb_type_models(vp56_context_t *s)
             p5689 = p56 + p89;
             p156789 = p17 + p5689;
 
-            s->mb_type_model[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
-            s->mb_type_model[ctx][type][2] = 1 + 255 * p02  / (1+p0234);
-            s->mb_type_model[ctx][type][3] = 1 + 255 * p17  / (1+p156789);
-            s->mb_type_model[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
-            s->mb_type_model[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
-            s->mb_type_model[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
-            s->mb_type_model[ctx][type][7] = 1 + 255 * p56  / (1+p5689);
-            s->mb_type_model[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
-            s->mb_type_model[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
+            model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
+            model->mb_type[ctx][type][2] = 1 + 255 * p02  / (1+p0234);
+            model->mb_type[ctx][type][3] = 1 + 255 * p17  / (1+p156789);
+            model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
+            model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
+            model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
+            model->mb_type[ctx][type][7] = 1 + 255 * p56  / (1+p5689);
+            model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
+            model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
 
             /* restore initial value */
-            p[type] = 100 * s->mb_types_stats[ctx][type][1];
+            p[type] = 100 * model->mb_types_stats[ctx][type][1];
         }
     }
 }
@@ -144,7 +146,7 @@ static void vp56_parse_mb_type_models(vp56_context_t *s)
 static vp56_mb_t vp56_parse_mb_type(vp56_context_t *s,
                                     vp56_mb_t prev_type, int ctx)
 {
-    uint8_t *mb_type_model = s->mb_type_model[ctx][prev_type];
+    uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
     vp56_range_coder_t *c = &s->c;
 
     if (vp56_rac_get_prob(c, mb_type_model[0]))
@@ -501,6 +503,8 @@ int vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     int golden_frame = 0;
     int res;
 
+    s->modelp = &s->models;
+
     res = s->parse_header(s, buf, buf_size, &golden_frame);
     if (!res)
         return -1;
diff --git a/libavcodec/vp56.h b/libavcodec/vp56.h
index ee47b345ad..adae42b35f 100644
--- a/libavcodec/vp56.h
+++ b/libavcodec/vp56.h
@@ -69,6 +69,23 @@ typedef struct {
     vp56_mv_t mv;
 } vp56_macroblock_t;
 
+typedef struct {
+    uint8_t coeff_reorder[64];       /* used in vp6 only */
+    uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
+    uint8_t vector_sig[2];           /* delta sign */
+    uint8_t vector_dct[2];           /* delta coding types */
+    uint8_t vector_pdi[2][2];        /* predefined delta init */
+    uint8_t vector_pdv[2][7];        /* predefined delta values */
+    uint8_t vector_fdv[2][8];        /* 8 bit delta value definition */
+    uint8_t coeff_dccv[2][11];       /* DC coeff value */
+    uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
+    uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
+    uint8_t coeff_dcct[2][36][5];    /* DC coeff coding type */
+    uint8_t coeff_runv[2][14];       /* run value (vp6 only) */
+    uint8_t mb_type[3][10][10];      /* model for decoding MB type */
+    uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
+} vp56_model_t;
+
 struct vp56_context {
     AVCodecContext *avctx;
     DSPContext dsp;
@@ -103,8 +120,6 @@ struct vp56_context {
     vp56_mb_t mb_type;
     vp56_macroblock_t *macroblocks;
     DECLARE_ALIGNED_16(DCTELEM, block_coeff[6][64]);
-    uint8_t coeff_reorder[64];       /* used in vp6 only */
-    uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
 
     /* motion vectors */
     vp56_mv_t mv[6];  /* vectors for each block in MB */
@@ -119,19 +134,6 @@ struct vp56_context {
     int max_vector_length;
     int sample_variance_threshold;
 
-    /* AC models */
-    uint8_t vector_model_sig[2];           /* delta sign */
-    uint8_t vector_model_dct[2];           /* delta coding types */
-    uint8_t vector_model_pdi[2][2];        /* predefined delta init */
-    uint8_t vector_model_pdv[2][7];        /* predefined delta values */
-    uint8_t vector_model_fdv[2][8];        /* 8 bit delta value definition */
-    uint8_t mb_type_model[3][10][10];      /* model for decoding MB type */
-    uint8_t coeff_model_dccv[2][11];       /* DC coeff value */
-    uint8_t coeff_model_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
-    uint8_t coeff_model_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
-    uint8_t coeff_model_dcct[2][36][5];    /* DC coeff coding type */
-    uint8_t coeff_model_runv[2][14];       /* run value (vp6 only) */
-    uint8_t mb_types_stats[3][10][2];      /* contextual, next MB type stats */
     uint8_t coeff_ctx[4][64];              /* used in vp5 only */
     uint8_t coeff_ctx_last[4];             /* used in vp5 only */
 
@@ -150,6 +152,9 @@ struct vp56_context {
     vp56_parse_vector_models_t parse_vector_models;
     vp56_parse_coeff_models_t parse_coeff_models;
     vp56_parse_header_t parse_header;
+
+    vp56_model_t *modelp;
+    vp56_model_t models;
 };
 
 
diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index d2ae7e26f5..5c4b935ae5 100644
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -145,25 +145,27 @@ static void vp6_coeff_order_table_init(vp56_context_t *s)
 {
     int i, pos, idx = 1;
 
-    s->coeff_index_to_pos[0] = 0;
+    s->modelp->coeff_index_to_pos[0] = 0;
     for (i=0; i<16; i++)
         for (pos=1; pos<64; pos++)
-            if (s->coeff_reorder[pos] == i)
-                s->coeff_index_to_pos[idx++] = pos;
+            if (s->modelp->coeff_reorder[pos] == i)
+                s->modelp->coeff_index_to_pos[idx++] = pos;
 }
 
 static void vp6_default_models_init(vp56_context_t *s)
 {
-    s->vector_model_dct[0] = 0xA2;
-    s->vector_model_dct[1] = 0xA4;
-    s->vector_model_sig[0] = 0x80;
-    s->vector_model_sig[1] = 0x80;
+    vp56_model_t *model = s->modelp;
 
-    memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats));
-    memcpy(s->vector_model_fdv, vp6_def_fdv_vector_model, sizeof(s->vector_model_fdv));
-    memcpy(s->vector_model_pdv, vp6_def_pdv_vector_model, sizeof(s->vector_model_pdv));
-    memcpy(s->coeff_model_runv, vp6_def_runv_coeff_model, sizeof(s->coeff_model_runv));
-    memcpy(s->coeff_reorder, vp6_def_coeff_reorder, sizeof(s->coeff_reorder));
+    model->vector_dct[0] = 0xA2;
+    model->vector_dct[1] = 0xA4;
+    model->vector_sig[0] = 0x80;
+    model->vector_sig[1] = 0x80;
+
+    memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
+    memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
+    memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
+    memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
+    memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
 
     vp6_coeff_order_table_init(s);
 }
@@ -171,29 +173,31 @@ static void vp6_default_models_init(vp56_context_t *s)
 static void vp6_parse_vector_models(vp56_context_t *s)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     int comp, node;
 
     for (comp=0; comp<2; comp++) {
         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
-            s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7);
+            model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
         if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
-            s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7);
+            model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
     }
 
     for (comp=0; comp<2; comp++)
         for (node=0; node<7; node++)
             if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
-                s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
+                model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
 
     for (comp=0; comp<2; comp++)
         for (node=0; node<8; node++)
             if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
-                s->vector_model_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
+                model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
 }
 
 static void vp6_parse_coeff_models(vp56_context_t *s)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     int def_prob[11];
     int node, cg, ctx, pos;
     int ct;    /* code type */
@@ -205,22 +209,22 @@ static void vp6_parse_coeff_models(vp56_context_t *s)
         for (node=0; node<11; node++)
             if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
                 def_prob[node] = vp56_rac_gets_nn(c, 7);
-                s->coeff_model_dccv[pt][node] = def_prob[node];
+                model->coeff_dccv[pt][node] = def_prob[node];
             } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
-                s->coeff_model_dccv[pt][node] = def_prob[node];
+                model->coeff_dccv[pt][node] = def_prob[node];
             }
 
     if (vp56_rac_get(c)) {
         for (pos=1; pos<64; pos++)
             if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
-                s->coeff_reorder[pos] = vp56_rac_gets(c, 4);
+                model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
         vp6_coeff_order_table_init(s);
     }
 
     for (cg=0; cg<2; cg++)
         for (node=0; node<14; node++)
             if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
-                s->coeff_model_runv[cg][node] = vp56_rac_gets_nn(c, 7);
+                model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
 
     for (ct=0; ct<3; ct++)
         for (pt=0; pt<2; pt++)
@@ -228,21 +232,22 @@ static void vp6_parse_coeff_models(vp56_context_t *s)
                 for (node=0; node<11; node++)
                     if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
                         def_prob[node] = vp56_rac_gets_nn(c, 7);
-                        s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
+                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
                     } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
-                        s->coeff_model_ract[pt][ct][cg][node] = def_prob[node];
+                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
                     }
 
-    /* coeff_model_dcct is a linear combination of coeff_model_dccv */
+    /* coeff_dcct is a linear combination of coeff_dccv */
     for (pt=0; pt<2; pt++)
         for (ctx=0; ctx<3; ctx++)
             for (node=0; node<5; node++)
-                s->coeff_model_dcct[pt][ctx][node] = av_clip(((s->coeff_model_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
+                model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
 }
 
 static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
 {
     vp56_range_coder_t *c = &s->c;
+    vp56_model_t *model = s->modelp;
     int comp;
 
     *vect = (vp56_mv_t) {0,0};
@@ -252,22 +257,22 @@ static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
     for (comp=0; comp<2; comp++) {
         int i, delta = 0;
 
-        if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) {
+        if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
             static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
             for (i=0; i<sizeof(prob_order); i++) {
                 int j = prob_order[i];
-                delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][j])<<j;
+                delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
             }
             if (delta & 0xF0)
-                delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][3])<<3;
+                delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
             else
                 delta |= 8;
         } else {
             delta = vp56_rac_get_tree(c, vp56_pva_tree,
-                                      s->vector_model_pdv[comp]);
+                                      model->vector_pdv[comp]);
         }
 
-        if (delta && vp56_rac_get_prob(c, s->vector_model_sig[comp]))
+        if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
             delta = -delta;
 
         if (!comp)
@@ -280,8 +285,9 @@ static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
 static void vp6_parse_coeff(vp56_context_t *s)
 {
     vp56_range_coder_t *c = s->ccp;
+    vp56_model_t *model = s->modelp;
     uint8_t *permute = s->scantable.permutated;
-    uint8_t *model, *model2, *model3;
+    uint8_t *model1, *model2, *model3;
     int coeff, sign, coeff_idx;
     int b, i, cg, idx, ctx;
     int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
@@ -294,21 +300,21 @@ static void vp6_parse_coeff(vp56_context_t *s)
 
         ctx = s->left_block[vp56_b6to4[b]].not_null_dc
               + s->above_blocks[s->above_block_idx[b]].not_null_dc;
-        model = s->coeff_model_dccv[pt];
-        model2 = s->coeff_model_dcct[pt][ctx];
+        model1 = model->coeff_dccv[pt];
+        model2 = model->coeff_dcct[pt][ctx];
 
         for (coeff_idx=0; coeff_idx<64; ) {
             if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
                 /* parse a coeff */
                 if (vp56_rac_get_prob(c, model2[2])) {
                     if (vp56_rac_get_prob(c, model2[3])) {
-                        idx = vp56_rac_get_tree(c, vp56_pc_tree, model);
+                        idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
                         coeff = vp56_coeff_bias[idx];
                         for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
                             coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
                     } else {
                         if (vp56_rac_get_prob(c, model2[4]))
-                            coeff = 3 + vp56_rac_get_prob(c, model[5]);
+                            coeff = 3 + vp56_rac_get_prob(c, model1[5]);
                         else
                             coeff = 2;
                     }
@@ -321,7 +327,7 @@ static void vp6_parse_coeff(vp56_context_t *s)
                 coeff = (coeff ^ -sign) + sign;
                 if (coeff_idx)
                     coeff *= s->dequant_ac;
-                idx = s->coeff_index_to_pos[coeff_idx];
+                idx = model->coeff_index_to_pos[coeff_idx];
                 s->block_coeff[b][permute[idx]] = coeff;
                 run = 1;
             } else {
@@ -331,7 +337,7 @@ static void vp6_parse_coeff(vp56_context_t *s)
                     if (!vp56_rac_get_prob(c, model2[1]))
                         break;
 
-                    model3 = s->coeff_model_runv[coeff_idx >= 6];
+                    model3 = model->coeff_runv[coeff_idx >= 6];
                     run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
                     if (!run)
                         for (run=9, i=0; i<6; i++)
@@ -340,7 +346,7 @@ static void vp6_parse_coeff(vp56_context_t *s)
             }
 
             cg = vp6_coeff_groups[coeff_idx+=run];
-            model = model2 = s->coeff_model_ract[pt][ct][cg];
+            model1 = model2 = model->coeff_ract[pt][ct][cg];
         }
 
         s->left_block[vp56_b6to4[b]].not_null_dc =