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 VP8_COMMON_ENTROPYMV_H_ 13 #define VP8_COMMON_ENTROPYMV_H_ 14 15 #include "treecoder.h" 16 17 #ifdef __cplusplus 18 extern "C" { 19 #endif 20 21 enum 22 { 23 mv_max = 1023, /* max absolute value of a MV component */ 24 MVvals = (2 * mv_max) + 1, /* # possible values "" */ 25 mvfp_max = 255, /* max absolute value of a full pixel MV component */ 26 MVfpvals = (2 * mvfp_max) +1, /* # possible full pixel MV values */ 27 28 mvlong_width = 10, /* Large MVs have 9 bit magnitudes */ 29 mvnum_short = 8, /* magnitudes 0 through 7 */ 30 31 /* probability offsets for coding each MV component */ 32 33 mvpis_short = 0, /* short (<= 7) vs long (>= 8) */ 34 MVPsign, /* sign for non-zero */ 35 MVPshort, /* 8 short values = 7-position tree */ 36 37 MVPbits = MVPshort + mvnum_short - 1, /* mvlong_width long value bits */ 38 MVPcount = MVPbits + mvlong_width /* (with independent probabilities) */ 39 }; 40 41 typedef struct mv_context 42 { 43 vp8_prob prob[MVPcount]; /* often come in row, col pairs */ 44 } MV_CONTEXT; 45 46 extern const MV_CONTEXT vp8_mv_update_probs[2], vp8_default_mv_context[2]; 47 48 #ifdef __cplusplus 49 } // extern "C" 50 #endif 51 52 #endif // VP8_COMMON_ENTROPYMV_H_ 53