2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
12 #ifndef __INC_ENTROPYMV_H
13 #define __INC_ENTROPYMV_H
15 #include "treecoder.h"
19 mv_max = 1023, /* max absolute value of a MV component */
20 MVvals = (2 * mv_max) + 1, /* # possible values "" */
21 mvfp_max = 255, /* max absolute value of a full pixel MV component */
22 MVfpvals = (2 * mvfp_max) +1, /* # possible full pixel MV values */
24 mvlong_width = 10, /* Large MVs have 9 bit magnitudes */
25 mvnum_short = 8, /* magnitudes 0 through 7 */
27 /* probability offsets for coding each MV component */
29 mvpis_short = 0, /* short (<= 7) vs long (>= 8) */
30 MVPsign, /* sign for non-zero */
31 MVPshort, /* 8 short values = 7-position tree */
33 MVPbits = MVPshort + mvnum_short - 1, /* mvlong_width long value bits */
34 MVPcount = MVPbits + mvlong_width /* (with independent probabilities) */
37 typedef struct mv_context
39 vp8_prob prob[MVPcount]; /* often come in row, col pairs */
42 extern const MV_CONTEXT vp8_mv_update_probs[2], vp8_default_mv_context[2];