193 lines
6.7 KiB
C
193 lines
6.7 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 VP9_COMMON_VP9_ENTROPY_H_
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#define VP9_COMMON_VP9_ENTROPY_H_
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#include "vpx/vpx_integer.h"
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#include "vp9/common/vp9_blockd.h"
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#include "vp9/common/vp9_common.h"
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#include "vp9/common/vp9_scan.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define DIFF_UPDATE_PROB 252
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// Coefficient token alphabet
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#define ZERO_TOKEN 0 // 0 Extra Bits 0+0
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#define ONE_TOKEN 1 // 1 Extra Bits 0+1
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#define TWO_TOKEN 2 // 2 Extra Bits 0+1
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#define THREE_TOKEN 3 // 3 Extra Bits 0+1
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#define FOUR_TOKEN 4 // 4 Extra Bits 0+1
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#define CATEGORY1_TOKEN 5 // 5-6 Extra Bits 1+1
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#define CATEGORY2_TOKEN 6 // 7-10 Extra Bits 2+1
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#define CATEGORY3_TOKEN 7 // 11-18 Extra Bits 3+1
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#define CATEGORY4_TOKEN 8 // 19-34 Extra Bits 4+1
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#define CATEGORY5_TOKEN 9 // 35-66 Extra Bits 5+1
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#define CATEGORY6_TOKEN 10 // 67+ Extra Bits 14+1
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#define EOB_TOKEN 11 // EOB Extra Bits 0+0
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#define ENTROPY_TOKENS 12
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#define ENTROPY_NODES 11
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DECLARE_ALIGNED(16, extern const uint8_t, vp9_pt_energy_class[ENTROPY_TOKENS]);
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#define EOB_MODEL_TOKEN 3
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extern const vp9_tree_index vp9_coefmodel_tree[];
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typedef struct {
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const vp9_tree_index *tree;
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const vp9_prob *prob;
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int len;
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int base_val;
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} vp9_extra_bit;
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// indexed by token value
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extern const vp9_extra_bit vp9_extra_bits[ENTROPY_TOKENS];
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#define DCT_MAX_VALUE 16384
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/* Coefficients are predicted via a 3-dimensional probability table. */
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#define REF_TYPES 2 // intra=0, inter=1
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/* Middle dimension reflects the coefficient position within the transform. */
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#define COEF_BANDS 6
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/* Inside dimension is measure of nearby complexity, that reflects the energy
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of nearby coefficients are nonzero. For the first coefficient (DC, unless
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block type is 0), we look at the (already encoded) blocks above and to the
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left of the current block. The context index is then the number (0,1,or 2)
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of these blocks having nonzero coefficients.
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After decoding a coefficient, the measure is determined by the size of the
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most recently decoded coefficient.
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Note that the intuitive meaning of this measure changes as coefficients
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are decoded, e.g., prior to the first token, a zero means that my neighbors
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are empty while, after the first token, because of the use of end-of-block,
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a zero means we just decoded a zero and hence guarantees that a non-zero
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coefficient will appear later in this block. However, this shift
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in meaning is perfectly OK because our context depends also on the
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coefficient band (and since zigzag positions 0, 1, and 2 are in
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distinct bands). */
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#define COEFF_CONTEXTS 6
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#define BAND_COEFF_CONTEXTS(band) ((band) == 0 ? 3 : COEFF_CONTEXTS)
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// #define ENTROPY_STATS
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typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
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[ENTROPY_TOKENS];
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typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][COEFF_CONTEXTS]
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[ENTROPY_NODES][2];
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#define SUBEXP_PARAM 4 /* Subexponential code parameter */
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#define MODULUS_PARAM 13 /* Modulus parameter */
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struct VP9Common;
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void vp9_default_coef_probs(struct VP9Common *cm);
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void vp9_adapt_coef_probs(struct VP9Common *cm);
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static INLINE void reset_skip_context(MACROBLOCKD *xd, BLOCK_SIZE bsize) {
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int i;
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for (i = 0; i < MAX_MB_PLANE; i++) {
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struct macroblockd_plane *const pd = &xd->plane[i];
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const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
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vpx_memset(pd->above_context, 0, sizeof(ENTROPY_CONTEXT) *
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num_4x4_blocks_wide_lookup[plane_bsize]);
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vpx_memset(pd->left_context, 0, sizeof(ENTROPY_CONTEXT) *
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num_4x4_blocks_high_lookup[plane_bsize]);
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}
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}
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// This is the index in the scan order beyond which all coefficients for
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// 8x8 transform and above are in the top band.
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// This macro is currently unused but may be used by certain implementations
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#define MAXBAND_INDEX 21
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DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_8x8plus[1024]);
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DECLARE_ALIGNED(16, extern const uint8_t, vp9_coefband_trans_4x4[16]);
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static INLINE const uint8_t *get_band_translate(TX_SIZE tx_size) {
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return tx_size == TX_4X4 ? vp9_coefband_trans_4x4
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: vp9_coefband_trans_8x8plus;
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}
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// 128 lists of probabilities are stored for the following ONE node probs:
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// 1, 3, 5, 7, ..., 253, 255
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// In between probabilities are interpolated linearly
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#define COEFF_PROB_MODELS 256
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#define UNCONSTRAINED_NODES 3
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#define PIVOT_NODE 2 // which node is pivot
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#define MODEL_NODES (ENTROPY_NODES - UNCONSTRAINED_NODES)
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extern const vp9_prob vp9_pareto8_full[COEFF_PROB_MODELS][MODEL_NODES];
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typedef vp9_prob vp9_coeff_probs_model[REF_TYPES][COEF_BANDS]
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[COEFF_CONTEXTS][UNCONSTRAINED_NODES];
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typedef unsigned int vp9_coeff_count_model[REF_TYPES][COEF_BANDS]
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[COEFF_CONTEXTS]
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[UNCONSTRAINED_NODES + 1];
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void vp9_model_to_full_probs(const vp9_prob *model, vp9_prob *full);
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static INLINE int get_entropy_context(TX_SIZE tx_size, const ENTROPY_CONTEXT *a,
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const ENTROPY_CONTEXT *l) {
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ENTROPY_CONTEXT above_ec = 0, left_ec = 0;
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switch (tx_size) {
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case TX_4X4:
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above_ec = a[0] != 0;
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left_ec = l[0] != 0;
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break;
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case TX_8X8:
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above_ec = !!*(const uint16_t *)a;
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left_ec = !!*(const uint16_t *)l;
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break;
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case TX_16X16:
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above_ec = !!*(const uint32_t *)a;
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left_ec = !!*(const uint32_t *)l;
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break;
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case TX_32X32:
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above_ec = !!*(const uint64_t *)a;
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left_ec = !!*(const uint64_t *)l;
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break;
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default:
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assert(0 && "Invalid transform size.");
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}
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return combine_entropy_contexts(above_ec, left_ec);
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}
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static const INLINE scan_order *get_scan(const MACROBLOCKD *xd, TX_SIZE tx_size,
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PLANE_TYPE type, int block_idx) {
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const MODE_INFO *const mi = xd->mi_8x8[0];
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if (is_inter_block(&mi->mbmi) || type != PLANE_TYPE_Y || xd->lossless) {
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return &vp9_default_scan_orders[tx_size];
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} else {
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const MB_PREDICTION_MODE mode = get_y_mode(mi, block_idx);
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return &vp9_scan_orders[tx_size][mode2txfm_map[mode]];
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}
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}
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VP9_COMMON_VP9_ENTROPY_H_
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