libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_entropymv.h

+/*
+ *  Copyright (c) 2010 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.
+ */
+
+
+#ifndef VP9_COMMON_VP9_ENTROPYMV_H_
+#define VP9_COMMON_VP9_ENTROPYMV_H_
+
+#include "vp9/common/vp9_treecoder.h"
+#include "vpx_config.h"
+#include "vp9/common/vp9_blockd.h"
+
+struct VP9Common;
+
+void vp9_entropy_mv_init();
+void vp9_init_mv_probs(struct VP9Common *cm);
+
+void vp9_adapt_nmv_probs(struct VP9Common *cm, int usehp);
+int vp9_use_nmv_hp(const MV *ref);
+
+#define VP9_NMV_UPDATE_PROB  255
+//#define MV_GROUP_UPDATE
+
+#define LOW_PRECISION_MV_UPDATE  /* Use 7 bit forward update */
+
+/* Symbols for coding which components are zero jointly */
+#define MV_JOINTS     4
+typedef enum {
+  MV_JOINT_ZERO = 0,             /* Zero vector */
+  MV_JOINT_HNZVZ = 1,            /* Vert zero, hor nonzero */
+  MV_JOINT_HZVNZ = 2,            /* Hor zero, vert nonzero */
+  MV_JOINT_HNZVNZ = 3,           /* Both components nonzero */
+} MV_JOINT_TYPE;
+
+extern const vp9_tree_index vp9_mv_joint_tree[2 * MV_JOINTS - 2];
+extern struct vp9_token_struct vp9_mv_joint_encodings [MV_JOINTS];
+
+/* Symbols for coding magnitude class of nonzero components */
+#define MV_CLASSES     8
+typedef enum {
+  MV_CLASS_0 = 0,      /* (0, 2]     integer pel */
+  MV_CLASS_1 = 1,      /* (2, 4]     integer pel */
+  MV_CLASS_2 = 2,      /* (4, 8]     integer pel */
+  MV_CLASS_3 = 3,      /* (8, 16]    integer pel */
+  MV_CLASS_4 = 4,      /* (16, 32]   integer pel */
+  MV_CLASS_5 = 5,      /* (32, 64]   integer pel */
+  MV_CLASS_6 = 6,      /* (64, 128]  integer pel */
+  MV_CLASS_7 = 7,      /* (128, 256] integer pel */
+} MV_CLASS_TYPE;
+
+extern const vp9_tree_index vp9_mv_class_tree[2 * MV_CLASSES - 2];
+extern struct vp9_token_struct vp9_mv_class_encodings [MV_CLASSES];
+
+#define CLASS0_BITS    1  /* bits at integer precision for class 0 */
+#define CLASS0_SIZE    (1 << CLASS0_BITS)
+#define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
+
+#define MV_MAX_BITS    (MV_CLASSES + CLASS0_BITS + 2)
+#define MV_MAX         ((1 << MV_MAX_BITS) - 1)
+#define MV_VALS        ((MV_MAX << 1) + 1)
+
+extern const vp9_tree_index vp9_mv_class0_tree[2 * CLASS0_SIZE - 2];
+extern struct vp9_token_struct vp9_mv_class0_encodings[CLASS0_SIZE];
+
+extern const vp9_tree_index vp9_mv_fp_tree[2 * 4 - 2];
+extern struct vp9_token_struct vp9_mv_fp_encodings[4];
+
+typedef struct {
+  vp9_prob sign;
+  vp9_prob classes[MV_CLASSES - 1];
+  vp9_prob class0[CLASS0_SIZE - 1];
+  vp9_prob bits[MV_OFFSET_BITS];
+  vp9_prob class0_fp[CLASS0_SIZE][4 - 1];
+  vp9_prob fp[4 - 1];
+  vp9_prob class0_hp;
+  vp9_prob hp;
+} nmv_component;
+
+typedef struct {
+  vp9_prob joints[MV_JOINTS - 1];
+  nmv_component comps[2];
+} nmv_context;
+
+MV_JOINT_TYPE vp9_get_mv_joint(MV mv);
+MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
+int vp9_get_mv_mag(MV_CLASS_TYPE c, int offset);
+
+
+typedef struct {
+  unsigned int mvcount[MV_VALS];
+  unsigned int sign[2];
+  unsigned int classes[MV_CLASSES];
+  unsigned int class0[CLASS0_SIZE];
+  unsigned int bits[MV_OFFSET_BITS][2];
+  unsigned int class0_fp[CLASS0_SIZE][4];
+  unsigned int fp[4];
+  unsigned int class0_hp[2];
+  unsigned int hp[2];
+} nmv_component_counts;
+
+typedef struct {
+  unsigned int joints[MV_JOINTS];
+  nmv_component_counts comps[2];
+} nmv_context_counts;
+
+void vp9_increment_nmv(const MV *mv, const MV *ref, nmv_context_counts *mvctx,
+                       int usehp);
+extern const nmv_context vp9_default_nmv_context;
+void vp9_counts_to_nmv_context(
+    nmv_context_counts *NMVcount,
+    nmv_context *prob,
+    int usehp,
+    unsigned int (*branch_ct_joint)[2],
+    unsigned int (*branch_ct_sign)[2],
+    unsigned int (*branch_ct_classes)[MV_CLASSES - 1][2],
+    unsigned int (*branch_ct_class0)[CLASS0_SIZE - 1][2],
+    unsigned int (*branch_ct_bits)[MV_OFFSET_BITS][2],
+    unsigned int (*branch_ct_class0_fp)[CLASS0_SIZE][4 - 1][2],
+    unsigned int (*branch_ct_fp)[4 - 1][2],
+    unsigned int (*branch_ct_class0_hp)[2],
+    unsigned int (*branch_ct_hp)[2]);
+void vp9_counts_process(nmv_context_counts *NMVcount, int usehp);
+#endif