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 #ifndef VP8_COMMON_ENTROPYMV_H_ 12 #define VP8_COMMON_ENTROPYMV_H_ 13 14 #include "treecoder.h" 15 16 #ifdef __cplusplus 17 extern "C" { 18 #endif 19 20 enum { 21 mv_max = 1023, /* max absolute value of a MV component */ 22 MVvals = (2 * mv_max) + 1, /* # possible values "" */ 23 mvfp_max = 255, /* max absolute value of a full pixel MV component */ 24 MVfpvals = (2 * mvfp_max) + 1, /* # possible full pixel MV values */ 25 26 mvlong_width = 10, /* Large MVs have 9 bit magnitudes */ 27 mvnum_short = 8, /* magnitudes 0 through 7 */ 28 29 /* probability offsets for coding each MV component */ 30 31 mvpis_short = 0, /* short (<= 7) vs long (>= 8) */ 32 MVPsign, /* sign for non-zero */ 33 MVPshort, /* 8 short values = 7-position tree */ 34 35 MVPbits = MVPshort + mvnum_short - 1, /* mvlong_width long value bits */ 36 MVPcount = MVPbits + mvlong_width /* (with independent probabilities) */ 37 }; 38 39 typedef struct mv_context { 40 vp8_prob prob[MVPcount]; /* often come in row, col pairs */ 41 } MV_CONTEXT; 42 43 extern const MV_CONTEXT vp8_mv_update_probs[2], vp8_default_mv_context[2]; 44 45 #ifdef __cplusplus 46 } // extern "C" 47 #endif 48 49 #endif // VP8_COMMON_ENTROPYMV_H_ 50
