193 строки
6.9 KiB
C
193 строки
6.9 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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#include "vpx_mem/vpx_mem.h"
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#include "vpx_ports/mem.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/decoder/vp9_detokenize.h"
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#define EOB_CONTEXT_NODE 0
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#define ZERO_CONTEXT_NODE 1
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#define ONE_CONTEXT_NODE 2
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#define LOW_VAL_CONTEXT_NODE 0
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#define TWO_CONTEXT_NODE 1
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#define THREE_CONTEXT_NODE 2
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#define HIGH_LOW_CONTEXT_NODE 3
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#define CAT_ONE_CONTEXT_NODE 4
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#define CAT_THREEFOUR_CONTEXT_NODE 5
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#define CAT_THREE_CONTEXT_NODE 6
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#define CAT_FIVE_CONTEXT_NODE 7
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#define INCREMENT_COUNT(token) \
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do { \
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if (!cm->frame_parallel_decoding_mode) \
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++coef_counts[band][ctx][token]; \
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} while (0)
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#define WRITE_COEF_CONTINUE(val, token) \
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{ \
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v = (val * dqv) >> dq_shift; \
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dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v; \
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token_cache[scan[c]] = vp9_pt_energy_class[token]; \
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++c; \
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ctx = get_coef_context(nb, token_cache, c); \
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dqv = dq[1]; \
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continue; \
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}
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#define ADJUST_COEF(prob, bits_count) \
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do { \
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val += (vp9_read(r, prob) << bits_count); \
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} while (0)
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static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd, PLANE_TYPE type,
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int16_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq,
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int ctx, const int16_t *scan, const int16_t *nb,
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vp9_reader *r) {
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const int max_eob = 16 << (tx_size << 1);
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const FRAME_CONTEXT *const fc = &cm->fc;
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FRAME_COUNTS *const counts = &cm->counts;
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const int ref = is_inter_block(&xd->mi[0]->mbmi);
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int band, c = 0;
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const vp9_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
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fc->coef_probs[tx_size][type][ref];
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const vp9_prob *prob;
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unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1] =
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counts->coef[tx_size][type][ref];
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unsigned int (*eob_branch_count)[COEFF_CONTEXTS] =
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counts->eob_branch[tx_size][type][ref];
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uint8_t token_cache[32 * 32];
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const uint8_t *band_translate = get_band_translate(tx_size);
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const int dq_shift = (tx_size == TX_32X32);
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int v;
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int16_t dqv = dq[0];
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while (c < max_eob) {
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int val;
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band = *band_translate++;
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prob = coef_probs[band][ctx];
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if (!cm->frame_parallel_decoding_mode)
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++eob_branch_count[band][ctx];
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if (!vp9_read(r, prob[EOB_CONTEXT_NODE])) {
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INCREMENT_COUNT(EOB_MODEL_TOKEN);
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break;
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}
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while (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) {
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INCREMENT_COUNT(ZERO_TOKEN);
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dqv = dq[1];
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token_cache[scan[c]] = 0;
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++c;
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if (c >= max_eob)
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return c; // zero tokens at the end (no eob token)
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ctx = get_coef_context(nb, token_cache, c);
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band = *band_translate++;
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prob = coef_probs[band][ctx];
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}
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// ONE_CONTEXT_NODE_0_
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if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) {
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INCREMENT_COUNT(ONE_TOKEN);
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WRITE_COEF_CONTINUE(1, ONE_TOKEN);
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}
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INCREMENT_COUNT(TWO_TOKEN);
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prob = vp9_pareto8_full[prob[PIVOT_NODE] - 1];
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if (!vp9_read(r, prob[LOW_VAL_CONTEXT_NODE])) {
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if (!vp9_read(r, prob[TWO_CONTEXT_NODE])) {
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WRITE_COEF_CONTINUE(2, TWO_TOKEN);
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}
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if (!vp9_read(r, prob[THREE_CONTEXT_NODE])) {
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WRITE_COEF_CONTINUE(3, THREE_TOKEN);
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}
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WRITE_COEF_CONTINUE(4, FOUR_TOKEN);
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}
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if (!vp9_read(r, prob[HIGH_LOW_CONTEXT_NODE])) {
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if (!vp9_read(r, prob[CAT_ONE_CONTEXT_NODE])) {
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val = CAT1_MIN_VAL;
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ADJUST_COEF(vp9_cat1_prob[0], 0);
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WRITE_COEF_CONTINUE(val, CATEGORY1_TOKEN);
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}
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val = CAT2_MIN_VAL;
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ADJUST_COEF(vp9_cat2_prob[0], 1);
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ADJUST_COEF(vp9_cat2_prob[1], 0);
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WRITE_COEF_CONTINUE(val, CATEGORY2_TOKEN);
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}
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if (!vp9_read(r, prob[CAT_THREEFOUR_CONTEXT_NODE])) {
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if (!vp9_read(r, prob[CAT_THREE_CONTEXT_NODE])) {
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val = CAT3_MIN_VAL;
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ADJUST_COEF(vp9_cat3_prob[0], 2);
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ADJUST_COEF(vp9_cat3_prob[1], 1);
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ADJUST_COEF(vp9_cat3_prob[2], 0);
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WRITE_COEF_CONTINUE(val, CATEGORY3_TOKEN);
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}
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val = CAT4_MIN_VAL;
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ADJUST_COEF(vp9_cat4_prob[0], 3);
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ADJUST_COEF(vp9_cat4_prob[1], 2);
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ADJUST_COEF(vp9_cat4_prob[2], 1);
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ADJUST_COEF(vp9_cat4_prob[3], 0);
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WRITE_COEF_CONTINUE(val, CATEGORY4_TOKEN);
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}
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if (!vp9_read(r, prob[CAT_FIVE_CONTEXT_NODE])) {
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val = CAT5_MIN_VAL;
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ADJUST_COEF(vp9_cat5_prob[0], 4);
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ADJUST_COEF(vp9_cat5_prob[1], 3);
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ADJUST_COEF(vp9_cat5_prob[2], 2);
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ADJUST_COEF(vp9_cat5_prob[3], 1);
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ADJUST_COEF(vp9_cat5_prob[4], 0);
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WRITE_COEF_CONTINUE(val, CATEGORY5_TOKEN);
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}
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val = 0;
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[0]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[1]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[2]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[3]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[4]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[5]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[6]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[7]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[8]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[9]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[10]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[11]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[12]);
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val = (val << 1) | vp9_read(r, vp9_cat6_prob[13]);
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val += CAT6_MIN_VAL;
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WRITE_COEF_CONTINUE(val, CATEGORY6_TOKEN);
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}
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return c;
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}
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int vp9_decode_block_tokens(VP9_COMMON *cm, MACROBLOCKD *xd,
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int plane, int block, BLOCK_SIZE plane_bsize,
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int x, int y, TX_SIZE tx_size, vp9_reader *r) {
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struct macroblockd_plane *const pd = &xd->plane[plane];
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const int ctx = get_entropy_context(tx_size, pd->above_context + x,
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pd->left_context + y);
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const scan_order *so = get_scan(xd, tx_size, pd->plane_type, block);
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const int eob = decode_coefs(cm, xd, pd->plane_type,
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BLOCK_OFFSET(pd->dqcoeff, block), tx_size,
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pd->dequant, ctx, so->scan, so->neighbors, r);
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vp9_set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y);
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return eob;
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}
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