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media/libvpx/vp9/common/vp9_entropymv.h@ac0c01689b40 (annotated)

media/libvpx/vp9/common/vp9_entropymv.h

Thu, 15 Jan 2015 15:59:08 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 15 Jan 2015 15:59:08 +0100

branch

TOR_BUG_9701

changeset 10

ac0c01689b40

permissions

-rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/*
michael@0	2	* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0	3	*
michael@0	4	* Use of this source code is governed by a BSD-style license
michael@0	5	* that can be found in the LICENSE file in the root of the source
michael@0	6	* tree. An additional intellectual property rights grant can be found
michael@0	7	* in the file PATENTS. All contributing project authors may
michael@0	8	* be found in the AUTHORS file in the root of the source tree.
michael@0	9	*/
michael@0	10
michael@0	11
michael@0	12	#ifndef VP9_COMMON_VP9_ENTROPYMV_H_
michael@0	13	#define VP9_COMMON_VP9_ENTROPYMV_H_
michael@0	14
michael@0	15	#include "vp9/common/vp9_treecoder.h"
michael@0	16	#include "./vpx_config.h"
michael@0	17	#include "vp9/common/vp9_blockd.h"
michael@0	18
michael@0	19	struct VP9Common;
michael@0	20
michael@0	21	void vp9_entropy_mv_init();
michael@0	22	void vp9_init_mv_probs(struct VP9Common *cm);
michael@0	23
michael@0	24	void vp9_adapt_mv_probs(struct VP9Common *cm, int usehp);
michael@0	25	int vp9_use_mv_hp(const MV *ref);
michael@0	26
michael@0	27	#define NMV_UPDATE_PROB 252
michael@0	28
michael@0	29	/* Symbols for coding which components are zero jointly */
michael@0	30	#define MV_JOINTS 4
michael@0	31	typedef enum {
michael@0	32	MV_JOINT_ZERO = 0, /* Zero vector */
michael@0	33	MV_JOINT_HNZVZ = 1, /* Vert zero, hor nonzero */
michael@0	34	MV_JOINT_HZVNZ = 2, /* Hor zero, vert nonzero */
michael@0	35	MV_JOINT_HNZVNZ = 3, /* Both components nonzero */
michael@0	36	} MV_JOINT_TYPE;
michael@0	37
michael@0	38	static INLINE int mv_joint_vertical(MV_JOINT_TYPE type) {
michael@0	39	return type == MV_JOINT_HZVNZ || type == MV_JOINT_HNZVNZ;
michael@0	40	}
michael@0	41
michael@0	42	static INLINE int mv_joint_horizontal(MV_JOINT_TYPE type) {
michael@0	43	return type == MV_JOINT_HNZVZ || type == MV_JOINT_HNZVNZ;
michael@0	44	}
michael@0	45
michael@0	46	/* Symbols for coding magnitude class of nonzero components */
michael@0	47	#define MV_CLASSES 11
michael@0	48	typedef enum {
michael@0	49	MV_CLASS_0 = 0, /* (0, 2] integer pel */
michael@0	50	MV_CLASS_1 = 1, /* (2, 4] integer pel */
michael@0	51	MV_CLASS_2 = 2, /* (4, 8] integer pel */
michael@0	52	MV_CLASS_3 = 3, /* (8, 16] integer pel */
michael@0	53	MV_CLASS_4 = 4, /* (16, 32] integer pel */
michael@0	54	MV_CLASS_5 = 5, /* (32, 64] integer pel */
michael@0	55	MV_CLASS_6 = 6, /* (64, 128] integer pel */
michael@0	56	MV_CLASS_7 = 7, /* (128, 256] integer pel */
michael@0	57	MV_CLASS_8 = 8, /* (256, 512] integer pel */
michael@0	58	MV_CLASS_9 = 9, /* (512, 1024] integer pel */
michael@0	59	MV_CLASS_10 = 10, /* (1024,2048] integer pel */
michael@0	60	} MV_CLASS_TYPE;
michael@0	61
michael@0	62	#define CLASS0_BITS 1 /* bits at integer precision for class 0 */
michael@0	63	#define CLASS0_SIZE (1 << CLASS0_BITS)
michael@0	64	#define MV_OFFSET_BITS (MV_CLASSES + CLASS0_BITS - 2)
michael@0	65
michael@0	66	#define MV_MAX_BITS (MV_CLASSES + CLASS0_BITS + 2)
michael@0	67	#define MV_MAX ((1 << MV_MAX_BITS) - 1)
michael@0	68	#define MV_VALS ((MV_MAX << 1) + 1)
michael@0	69
michael@0	70	#define MV_IN_USE_BITS 14
michael@0	71	#define MV_UPP ((1 << MV_IN_USE_BITS) - 1)
michael@0	72	#define MV_LOW (-(1 << MV_IN_USE_BITS))
michael@0	73
michael@0	74	extern const vp9_tree_index vp9_mv_joint_tree[TREE_SIZE(MV_JOINTS)];
michael@0	75	extern struct vp9_token vp9_mv_joint_encodings[MV_JOINTS];
michael@0	76
michael@0	77	extern const vp9_tree_index vp9_mv_class_tree[TREE_SIZE(MV_CLASSES)];
michael@0	78	extern struct vp9_token vp9_mv_class_encodings[MV_CLASSES];
michael@0	79
michael@0	80	extern const vp9_tree_index vp9_mv_class0_tree[TREE_SIZE(CLASS0_SIZE)];
michael@0	81	extern struct vp9_token vp9_mv_class0_encodings[CLASS0_SIZE];
michael@0	82
michael@0	83	extern const vp9_tree_index vp9_mv_fp_tree[TREE_SIZE(4)];
michael@0	84	extern struct vp9_token vp9_mv_fp_encodings[4];
michael@0	85
michael@0	86	typedef struct {
michael@0	87	vp9_prob sign;
michael@0	88	vp9_prob classes[MV_CLASSES - 1];
michael@0	89	vp9_prob class0[CLASS0_SIZE - 1];
michael@0	90	vp9_prob bits[MV_OFFSET_BITS];
michael@0	91	vp9_prob class0_fp[CLASS0_SIZE][4 - 1];
michael@0	92	vp9_prob fp[4 - 1];
michael@0	93	vp9_prob class0_hp;
michael@0	94	vp9_prob hp;
michael@0	95	} nmv_component;
michael@0	96
michael@0	97	typedef struct {
michael@0	98	vp9_prob joints[MV_JOINTS - 1];
michael@0	99	nmv_component comps[2];
michael@0	100	} nmv_context;
michael@0	101
michael@0	102	static INLINE MV_JOINT_TYPE vp9_get_mv_joint(const MV *mv) {
michael@0	103	if (mv->row == 0) {
michael@0	104	return mv->col == 0 ? MV_JOINT_ZERO : MV_JOINT_HNZVZ;
michael@0	105	} else {
michael@0	106	return mv->col == 0 ? MV_JOINT_HZVNZ : MV_JOINT_HNZVNZ;
michael@0	107	}
michael@0	108	}
michael@0	109
michael@0	110	MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset);
michael@0	111	int vp9_get_mv_mag(MV_CLASS_TYPE c, int offset);
michael@0	112
michael@0	113
michael@0	114	typedef struct {
michael@0	115	unsigned int sign[2];
michael@0	116	unsigned int classes[MV_CLASSES];
michael@0	117	unsigned int class0[CLASS0_SIZE];
michael@0	118	unsigned int bits[MV_OFFSET_BITS][2];
michael@0	119	unsigned int class0_fp[CLASS0_SIZE][4];
michael@0	120	unsigned int fp[4];
michael@0	121	unsigned int class0_hp[2];
michael@0	122	unsigned int hp[2];
michael@0	123	} nmv_component_counts;
michael@0	124
michael@0	125	typedef struct {
michael@0	126	unsigned int joints[MV_JOINTS];
michael@0	127	nmv_component_counts comps[2];
michael@0	128	} nmv_context_counts;
michael@0	129
michael@0	130	void vp9_inc_mv(const MV *mv, nmv_context_counts *mvctx);
michael@0	131
michael@0	132	#endif // VP9_COMMON_VP9_ENTROPYMV_H_