52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VP8_COMMON_ENTROPYMV_H_
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#define VP8_COMMON_ENTROPYMV_H_
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#include "treecoder.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum
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{
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mv_max = 1023, /* max absolute value of a MV component */
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MVvals = (2 * mv_max) + 1, /* # possible values "" */
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mvfp_max = 255, /* max absolute value of a full pixel MV component */
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MVfpvals = (2 * mvfp_max) +1, /* # possible full pixel MV values */
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mvlong_width = 10, /* Large MVs have 9 bit magnitudes */
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mvnum_short = 8, /* magnitudes 0 through 7 */
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/* probability offsets for coding each MV component */
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mvpis_short = 0, /* short (<= 7) vs long (>= 8) */
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MVPsign, /* sign for non-zero */
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MVPshort, /* 8 short values = 7-position tree */
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MVPbits = MVPshort + mvnum_short - 1, /* mvlong_width long value bits */
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MVPcount = MVPbits + mvlong_width /* (with independent probabilities) */
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};
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typedef struct mv_context
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{
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vp8_prob prob[MVPcount]; /* often come in row, col pairs */
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} MV_CONTEXT;
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extern const MV_CONTEXT vp8_mv_update_probs[2], vp8_default_mv_context[2];
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VP8_COMMON_ENTROPYMV_H_
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