1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 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. 9 */ 10 11 12 #ifndef __INC_ENTROPYMV_H 13 #define __INC_ENTROPYMV_H 14 15 #include "treecoder.h" 16 17 enum 18 { 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 */ 23 24 mvlong_width = 10, /* Large MVs have 9 bit magnitudes */ 25 mvnum_short = 8, /* magnitudes 0 through 7 */ 26 27 /* probability offsets for coding each MV component */ 28 29 mvpis_short = 0, /* short (<= 7) vs long (>= 8) */ 30 MVPsign, /* sign for non-zero */ 31 MVPshort, /* 8 short values = 7-position tree */ 32 33 MVPbits = MVPshort + mvnum_short - 1, /* mvlong_width long value bits */ 34 MVPcount = MVPbits + mvlong_width /* (with independent probabilities) */ 35 }; 36 37 typedef struct mv_context 38 { 39 vp8_prob prob[MVPcount]; /* often come in row, col pairs */ 40 } MV_CONTEXT; 41 42 extern const MV_CONTEXT vp8_mv_update_probs[2], vp8_default_mv_context[2]; 43 44 #endif 45