213 lines
7.8 KiB
C
213 lines
7.8 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_treecoder.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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/* 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 DCT_VAL_CATEGORY1 5 /* 5-6 Extra Bits 1+1 */
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#define DCT_VAL_CATEGORY2 6 /* 7-10 Extra Bits 2+1 */
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#define DCT_VAL_CATEGORY3 7 /* 11-18 Extra Bits 3+1 */
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#define DCT_VAL_CATEGORY4 8 /* 19-34 Extra Bits 4+1 */
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#define DCT_VAL_CATEGORY5 9 /* 35-66 Extra Bits 5+1 */
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#define DCT_VAL_CATEGORY6 10 /* 67+ Extra Bits 14+1 */
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#define DCT_EOB_TOKEN 11 /* EOB Extra Bits 0+0 */
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#define MAX_ENTROPY_TOKENS 12
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#define ENTROPY_NODES 11
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#define EOSB_TOKEN 127 /* Not signalled, encoder only */
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#define INTER_MODE_CONTEXTS 7
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extern const vp9_tree_index vp9_coef_tree[];
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extern struct vp9_token vp9_coef_encodings[MAX_ENTROPY_TOKENS];
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typedef struct {
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vp9_tree_p 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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extern vp9_extra_bit vp9_extra_bits[12]; /* indexed by token value */
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#define PROB_UPDATE_BASELINE_COST 7
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#define MAX_PROB 255
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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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/* Outside dimension. 0 = Y with DC, 1 = UV */
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#define BLOCK_TYPES 2
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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 DC_TOKEN_CONTEXTS 3*/ /* 00, 0!0, !0!0 */
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#define PREV_COEF_CONTEXTS 6
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// Disables backward coef probs adaption
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// #define DISABLE_COEF_ADAPT
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typedef unsigned int vp9_coeff_count[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
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[MAX_ENTROPY_TOKENS];
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typedef unsigned int vp9_coeff_stats[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
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[ENTROPY_NODES][2];
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typedef vp9_prob vp9_coeff_probs[REF_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
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[ENTROPY_NODES];
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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 *);
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extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d_4x4[16]);
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extern DECLARE_ALIGNED(16, const int, vp9_col_scan_4x4[16]);
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extern DECLARE_ALIGNED(16, const int, vp9_row_scan_4x4[16]);
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extern DECLARE_ALIGNED(64, const int, vp9_default_zig_zag1d_8x8[64]);
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extern DECLARE_ALIGNED(16, const int, vp9_col_scan_8x8[64]);
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extern DECLARE_ALIGNED(16, const int, vp9_row_scan_8x8[64]);
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extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d_16x16[256]);
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extern DECLARE_ALIGNED(16, const int, vp9_col_scan_16x16[256]);
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extern DECLARE_ALIGNED(16, const int, vp9_row_scan_16x16[256]);
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extern DECLARE_ALIGNED(16, const int, vp9_default_zig_zag1d_32x32[1024]);
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void vp9_coef_tree_initialize(void);
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void vp9_adapt_coef_probs(struct VP9Common *);
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static INLINE void vp9_reset_sb_tokens_context(MACROBLOCKD* const xd,
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BLOCK_SIZE_TYPE bsize) {
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/* Clear entropy contexts */
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const int bw = 1 << b_width_log2(bsize);
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const int bh = 1 << b_height_log2(bsize);
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int i;
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for (i = 0; i < MAX_MB_PLANE; i++) {
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vpx_memset(xd->plane[i].above_context, 0,
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sizeof(ENTROPY_CONTEXT) * bw >> xd->plane[i].subsampling_x);
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vpx_memset(xd->plane[i].left_context, 0,
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sizeof(ENTROPY_CONTEXT) * bh >> xd->plane[i].subsampling_y);
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}
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}
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extern const int vp9_coef_bands8x8[64];
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extern const int vp9_coef_bands4x4[16];
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static int get_coef_band(const int *scan, TX_SIZE tx_size, int coef_index) {
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if (tx_size == TX_4X4) {
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return vp9_coef_bands4x4[scan[coef_index]];
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} else {
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const int pos = scan[coef_index];
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const int sz = 1 << (2 + tx_size);
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const int x = pos & (sz - 1), y = pos >> (2 + tx_size);
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if (x >= 8 || y >= 8)
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return 5;
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else
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return vp9_coef_bands8x8[y * 8 + x];
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}
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}
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extern int vp9_get_coef_context(const int *scan, const int *neighbors,
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int nb_pad, uint8_t *token_cache, int c, int l);
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const int *vp9_get_coef_neighbors_handle(const int *scan, int *pad);
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#if CONFIG_MODELCOEFPROB
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#define COEFPROB_BITS 8
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#define COEFPROB_MODELS (1 << COEFPROB_BITS)
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// 2 => EOB and Zero nodes are unconstrained, rest are modeled
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// 3 => EOB, Zero and One nodes are unconstrained, rest are modeled
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#define UNCONSTRAINED_NODES 3 // Choose one of 2 or 3
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// whether forward updates are model-based
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#define MODEL_BASED_UPDATE 1
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// if model-based how many nodes are unconstrained
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#define UNCONSTRAINED_UPDATE_NODES 3
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// whether backward updates are model-based
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#define MODEL_BASED_ADAPT 1
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#define UNCONSTRAINED_ADAPT_NODES 3
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typedef vp9_prob vp9_coeff_probs_model[REF_TYPES][COEF_BANDS]
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[PREV_COEF_CONTEXTS][2];
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extern const vp9_prob vp9_modelcoefprobs[COEFPROB_MODELS][ENTROPY_NODES - 1];
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void vp9_get_model_distribution(vp9_prob model, vp9_prob *tree_probs,
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int b, int r);
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#endif // CONFIG_MODELCOEFPROB
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static INLINE const int* get_scan_4x4(TX_TYPE tx_type) {
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switch (tx_type) {
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case ADST_DCT:
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return vp9_row_scan_4x4;
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case DCT_ADST:
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return vp9_col_scan_4x4;
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default:
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return vp9_default_zig_zag1d_4x4;
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}
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}
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static INLINE const int* get_scan_8x8(TX_TYPE tx_type) {
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switch (tx_type) {
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case ADST_DCT:
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return vp9_row_scan_8x8;
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case DCT_ADST:
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return vp9_col_scan_8x8;
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default:
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return vp9_default_zig_zag1d_8x8;
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}
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}
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static INLINE const int* get_scan_16x16(TX_TYPE tx_type) {
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switch (tx_type) {
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case ADST_DCT:
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return vp9_row_scan_16x16;
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case DCT_ADST:
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return vp9_col_scan_16x16;
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default:
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return vp9_default_zig_zag1d_16x16;
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}
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}
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#include "vp9/common/vp9_coefupdateprobs.h"
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#endif // VP9_COMMON_VP9_ENTROPY_H_
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