/* * 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. */ #include "vpx_mem/vpx_mem.h" #include "vpx_ports/mem.h" #include "vp9/common/vp9_blockd.h" #include "vp9/common/vp9_common.h" #include "vp9/decoder/vp9_detokenize.h" #define EOB_CONTEXT_NODE 0 #define ZERO_CONTEXT_NODE 1 #define ONE_CONTEXT_NODE 2 #define LOW_VAL_CONTEXT_NODE 0 #define TWO_CONTEXT_NODE 1 #define THREE_CONTEXT_NODE 2 #define HIGH_LOW_CONTEXT_NODE 3 #define CAT_ONE_CONTEXT_NODE 4 #define CAT_THREEFOUR_CONTEXT_NODE 5 #define CAT_THREE_CONTEXT_NODE 6 #define CAT_FIVE_CONTEXT_NODE 7 #define INCREMENT_COUNT(token) \ do { \ if (!cm->frame_parallel_decoding_mode) \ ++coef_counts[band][ctx][token]; \ } while (0) #define WRITE_COEF_CONTINUE(val, token) \ { \ v = (val * dqv) >> dq_shift; \ dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v; \ token_cache[scan[c]] = vp9_pt_energy_class[token]; \ ++c; \ ctx = get_coef_context(nb, token_cache, c); \ dqv = dq[1]; \ continue; \ } #define ADJUST_COEF(prob, bits_count) \ do { \ val += (vp9_read(r, prob) << bits_count); \ } while (0) static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd, PLANE_TYPE type, tran_low_t *dqcoeff, TX_SIZE tx_size, const int16_t *dq, int ctx, const int16_t *scan, const int16_t *nb, vp9_reader *r) { const int max_eob = 16 << (tx_size << 1); const FRAME_CONTEXT *const fc = &cm->fc; FRAME_COUNTS *const counts = &cm->counts; const int ref = is_inter_block(&xd->mi[0]->mbmi); int band, c = 0; const vp9_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] = fc->coef_probs[tx_size][type][ref]; const vp9_prob *prob; unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1] = counts->coef[tx_size][type][ref]; unsigned int (*eob_branch_count)[COEFF_CONTEXTS] = counts->eob_branch[tx_size][type][ref]; uint8_t token_cache[32 * 32]; const uint8_t *band_translate = get_band_translate(tx_size); const int dq_shift = (tx_size == TX_32X32); int v; int16_t dqv = dq[0]; while (c < max_eob) { int val; band = *band_translate++; prob = coef_probs[band][ctx]; if (!cm->frame_parallel_decoding_mode) ++eob_branch_count[band][ctx]; if (!vp9_read(r, prob[EOB_CONTEXT_NODE])) { INCREMENT_COUNT(EOB_MODEL_TOKEN); break; } while (!vp9_read(r, prob[ZERO_CONTEXT_NODE])) { INCREMENT_COUNT(ZERO_TOKEN); dqv = dq[1]; token_cache[scan[c]] = 0; ++c; if (c >= max_eob) return c; // zero tokens at the end (no eob token) ctx = get_coef_context(nb, token_cache, c); band = *band_translate++; prob = coef_probs[band][ctx]; } // ONE_CONTEXT_NODE_0_ if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) { INCREMENT_COUNT(ONE_TOKEN); WRITE_COEF_CONTINUE(1, ONE_TOKEN); } INCREMENT_COUNT(TWO_TOKEN); prob = vp9_pareto8_full[prob[PIVOT_NODE] - 1]; if (!vp9_read(r, prob[LOW_VAL_CONTEXT_NODE])) { if (!vp9_read(r, prob[TWO_CONTEXT_NODE])) { WRITE_COEF_CONTINUE(2, TWO_TOKEN); } if (!vp9_read(r, prob[THREE_CONTEXT_NODE])) { WRITE_COEF_CONTINUE(3, THREE_TOKEN); } WRITE_COEF_CONTINUE(4, FOUR_TOKEN); } if (!vp9_read(r, prob[HIGH_LOW_CONTEXT_NODE])) { if (!vp9_read(r, prob[CAT_ONE_CONTEXT_NODE])) { val = CAT1_MIN_VAL; ADJUST_COEF(vp9_cat1_prob[0], 0); WRITE_COEF_CONTINUE(val, CATEGORY1_TOKEN); } val = CAT2_MIN_VAL; ADJUST_COEF(vp9_cat2_prob[0], 1); ADJUST_COEF(vp9_cat2_prob[1], 0); WRITE_COEF_CONTINUE(val, CATEGORY2_TOKEN); } if (!vp9_read(r, prob[CAT_THREEFOUR_CONTEXT_NODE])) { if (!vp9_read(r, prob[CAT_THREE_CONTEXT_NODE])) { val = CAT3_MIN_VAL; ADJUST_COEF(vp9_cat3_prob[0], 2); ADJUST_COEF(vp9_cat3_prob[1], 1); ADJUST_COEF(vp9_cat3_prob[2], 0); WRITE_COEF_CONTINUE(val, CATEGORY3_TOKEN); } val = CAT4_MIN_VAL; ADJUST_COEF(vp9_cat4_prob[0], 3); ADJUST_COEF(vp9_cat4_prob[1], 2); ADJUST_COEF(vp9_cat4_prob[2], 1); ADJUST_COEF(vp9_cat4_prob[3], 0); WRITE_COEF_CONTINUE(val, CATEGORY4_TOKEN); } if (!vp9_read(r, prob[CAT_FIVE_CONTEXT_NODE])) { val = CAT5_MIN_VAL; ADJUST_COEF(vp9_cat5_prob[0], 4); ADJUST_COEF(vp9_cat5_prob[1], 3); ADJUST_COEF(vp9_cat5_prob[2], 2); ADJUST_COEF(vp9_cat5_prob[3], 1); ADJUST_COEF(vp9_cat5_prob[4], 0); WRITE_COEF_CONTINUE(val, CATEGORY5_TOKEN); } val = 0; val = (val << 1) | vp9_read(r, vp9_cat6_prob[0]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[1]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[2]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[3]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[4]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[5]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[6]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[7]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[8]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[9]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[10]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[11]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[12]); val = (val << 1) | vp9_read(r, vp9_cat6_prob[13]); val += CAT6_MIN_VAL; WRITE_COEF_CONTINUE(val, CATEGORY6_TOKEN); } return c; } int vp9_decode_block_tokens(VP9_COMMON *cm, MACROBLOCKD *xd, int plane, int block, BLOCK_SIZE plane_bsize, int x, int y, TX_SIZE tx_size, vp9_reader *r) { struct macroblockd_plane *const pd = &xd->plane[plane]; const int ctx = get_entropy_context(tx_size, pd->above_context + x, pd->left_context + y); const scan_order *so = get_scan(xd, tx_size, pd->plane_type, block); const int eob = decode_coefs(cm, xd, pd->plane_type, BLOCK_OFFSET(pd->dqcoeff, block), tx_size, pd->dequant, ctx, so->scan, so->neighbors, r); vp9_set_contexts(xd, pd, plane_bsize, tx_size, eob > 0, x, y); return eob; }