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Diffstat (limited to 'media/libvpx/vp8/common/entropy.h')
| -rw-r--r-- | media/libvpx/vp8/common/entropy.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/media/libvpx/vp8/common/entropy.h b/media/libvpx/vp8/common/entropy.h new file mode 100644 index 000000000..a90bab4ba --- /dev/null +++ b/media/libvpx/vp8/common/entropy.h @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2010 The WebM project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + + +#ifndef VP8_COMMON_ENTROPY_H_ +#define VP8_COMMON_ENTROPY_H_ + +#include "treecoder.h" +#include "blockd.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/* Coefficient token alphabet */ + +#define ZERO_TOKEN 0 /* 0 Extra Bits 0+0 */ +#define ONE_TOKEN 1 /* 1 Extra Bits 0+1 */ +#define TWO_TOKEN 2 /* 2 Extra Bits 0+1 */ +#define THREE_TOKEN 3 /* 3 Extra Bits 0+1 */ +#define FOUR_TOKEN 4 /* 4 Extra Bits 0+1 */ +#define DCT_VAL_CATEGORY1 5 /* 5-6 Extra Bits 1+1 */ +#define DCT_VAL_CATEGORY2 6 /* 7-10 Extra Bits 2+1 */ +#define DCT_VAL_CATEGORY3 7 /* 11-18 Extra Bits 3+1 */ +#define DCT_VAL_CATEGORY4 8 /* 19-34 Extra Bits 4+1 */ +#define DCT_VAL_CATEGORY5 9 /* 35-66 Extra Bits 5+1 */ +#define DCT_VAL_CATEGORY6 10 /* 67+ Extra Bits 11+1 */ +#define DCT_EOB_TOKEN 11 /* EOB Extra Bits 0+0 */ + +#define MAX_ENTROPY_TOKENS 12 +#define ENTROPY_NODES 11 + +extern const vp8_tree_index vp8_coef_tree[]; + +extern const struct vp8_token_struct vp8_coef_encodings[MAX_ENTROPY_TOKENS]; + +typedef struct +{ + vp8_tree_p tree; + const vp8_prob *prob; + int Len; + int base_val; +} vp8_extra_bit_struct; + +extern const vp8_extra_bit_struct vp8_extra_bits[12]; /* indexed by token value */ + +#define PROB_UPDATE_BASELINE_COST 7 + +#define MAX_PROB 255 +#define DCT_MAX_VALUE 2048 + + +/* Coefficients are predicted via a 3-dimensional probability table. */ + +/* Outside dimension. 0 = Y no DC, 1 = Y2, 2 = UV, 3 = Y with DC */ + +#define BLOCK_TYPES 4 + +/* Middle dimension is a coarsening of the coefficient's + position within the 4x4 DCT. */ + +#define COEF_BANDS 8 +extern DECLARE_ALIGNED(16, const unsigned char, vp8_coef_bands[16]); + +/* Inside dimension is 3-valued measure of nearby complexity, that is, + the extent to which nearby coefficients are nonzero. For the first + coefficient (DC, unless block type is 0), we look at the (already encoded) + blocks above and to the left of the current block. The context index is + then the number (0,1,or 2) of these blocks having nonzero coefficients. + After decoding a coefficient, the measure is roughly the size of the + most recently decoded coefficient (0 for 0, 1 for 1, 2 for >1). + Note that the intuitive meaning of this measure changes as coefficients + are decoded, e.g., prior to the first token, a zero means that my neighbors + are empty while, after the first token, because of the use of end-of-block, + a zero means we just decoded a zero and hence guarantees that a non-zero + coefficient will appear later in this block. However, this shift + in meaning is perfectly OK because our context depends also on the + coefficient band (and since zigzag positions 0, 1, and 2 are in + distinct bands). */ + +/*# define DC_TOKEN_CONTEXTS 3*/ /* 00, 0!0, !0!0 */ +# define PREV_COEF_CONTEXTS 3 + +extern DECLARE_ALIGNED(16, const unsigned char, vp8_prev_token_class[MAX_ENTROPY_TOKENS]); + +extern const vp8_prob vp8_coef_update_probs [BLOCK_TYPES] [COEF_BANDS] [PREV_COEF_CONTEXTS] [ENTROPY_NODES]; + + +struct VP8Common; +void vp8_default_coef_probs(struct VP8Common *); + +extern DECLARE_ALIGNED(16, const int, vp8_default_zig_zag1d[16]); +extern DECLARE_ALIGNED(16, const short, vp8_default_inv_zig_zag[16]); +extern DECLARE_ALIGNED(16, const short, vp8_default_zig_zag_mask[16]); +extern const int vp8_mb_feature_data_bits[MB_LVL_MAX]; + +void vp8_coef_tree_initialize(void); +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // VP8_COMMON_ENTROPY_H_ |