static int decode_term_subexp(vp9_reader *r) { if (!vp9_read_bit(r)) return vp9_read_literal(r, 4); if (!vp9_read_bit(r)) return vp9_read_literal(r, 4) + 16; if (!vp9_read_bit(r)) return vp9_read_literal(r, 5) + 32; return decode_uniform(r) + 64; }
static void setup_txfm_mode(VP9_COMMON *pc, int lossless, vp9_reader *r) { if (lossless) { pc->txfm_mode = ONLY_4X4; } else { pc->txfm_mode = vp9_read_literal(r, 2); if (pc->txfm_mode == ALLOW_32X32) pc->txfm_mode += vp9_read_bit(r); if (pc->txfm_mode == TX_MODE_SELECT) { int i, j; for (i = 0; i < TX_SIZE_CONTEXTS; ++i) { for (j = 0; j < TX_SIZE_MAX_SB - 3; ++j) { if (vp9_read(r, VP9_MODE_UPDATE_PROB)) pc->fc.tx_probs_8x8p[i][j] = vp9_read_prob_diff_update(r, pc->fc.tx_probs_8x8p[i][j]); } } for (i = 0; i < TX_SIZE_CONTEXTS; ++i) { for (j = 0; j < TX_SIZE_MAX_SB - 2; ++j) { if (vp9_read(r, VP9_MODE_UPDATE_PROB)) pc->fc.tx_probs_16x16p[i][j] = vp9_read_prob_diff_update(r, pc->fc.tx_probs_16x16p[i][j]); } } for (i = 0; i < TX_SIZE_CONTEXTS; ++i) { for (j = 0; j < TX_SIZE_MAX_SB - 1; ++j) { if (vp9_read(r, VP9_MODE_UPDATE_PROB)) pc->fc.tx_probs_32x32p[i][j] = vp9_read_prob_diff_update(r, pc->fc.tx_probs_32x32p[i][j]); } } } } }
static int decode_uniform(vp9_reader *r, int n) { int v; const int l = get_unsigned_bits(n); const int m = (1 << l) - n; if (!l) return 0; v = vp9_read_literal(r, l - 1); return v < m ? v : (v << 1) - m + vp9_read_bit(r); }
static int decode_term_subexp(vp9_reader *r, int k, int num_syms) { int i = 0, mk = 0, word; while (1) { const int b = i ? k + i - 1 : k; const int a = 1 << b; if (num_syms <= mk + 3 * a) { word = decode_uniform(r, num_syms - mk) + mk; break; } else { if (vp9_read_bit(r)) { i++; mk += a; } else { word = vp9_read_literal(r, b) + mk; break; } } } return word; }
static int decode_uniform(vp9_reader *r) { const int l = 8; const int m = (1 << l) - 191; const int v = vp9_read_literal(r, l - 1); return v < m ? v : (v << 1) - m + vp9_read_bit(r); }
static int decode_coefs(VP9_COMMON *cm, const MACROBLOCKD *xd, FRAME_COUNTS *counts, 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; const int ref = is_inter_block(&xd->mi[0].src_mi->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, token; int16_t dqv = dq[0]; const uint8_t *cat1_prob; const uint8_t *cat2_prob; const uint8_t *cat3_prob; const uint8_t *cat4_prob; const uint8_t *cat5_prob; const uint8_t *cat6_prob; #if CONFIG_VP9_HIGHBITDEPTH if (cm->use_highbitdepth) { if (cm->bit_depth == VPX_BITS_10) { cat1_prob = vp9_cat1_prob_high10; cat2_prob = vp9_cat2_prob_high10; cat3_prob = vp9_cat3_prob_high10; cat4_prob = vp9_cat4_prob_high10; cat5_prob = vp9_cat5_prob_high10; cat6_prob = vp9_cat6_prob_high10; } else { cat1_prob = vp9_cat1_prob_high12; cat2_prob = vp9_cat2_prob_high12; cat3_prob = vp9_cat3_prob_high12; cat4_prob = vp9_cat4_prob_high12; cat5_prob = vp9_cat5_prob_high12; cat6_prob = vp9_cat6_prob_high12; } } else { cat1_prob = vp9_cat1_prob; cat2_prob = vp9_cat2_prob; cat3_prob = vp9_cat3_prob; cat4_prob = vp9_cat4_prob; cat5_prob = vp9_cat5_prob; cat6_prob = vp9_cat6_prob; } #else cat1_prob = vp9_cat1_prob; cat2_prob = vp9_cat2_prob; cat3_prob = vp9_cat3_prob; cat4_prob = vp9_cat4_prob; cat5_prob = vp9_cat5_prob; cat6_prob = vp9_cat6_prob; #endif while (c < max_eob) { int val = -1; 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]; } if (!vp9_read(r, prob[ONE_CONTEXT_NODE])) { INCREMENT_COUNT(ONE_TOKEN); token = ONE_TOKEN; val = 1; } else { INCREMENT_COUNT(TWO_TOKEN); token = vp9_read_tree(r, coeff_subtree_high, vp9_pareto8_full[prob[PIVOT_NODE] - 1]); switch (token) { case TWO_TOKEN: case THREE_TOKEN: case FOUR_TOKEN: val = token; break; case CATEGORY1_TOKEN: val = CAT1_MIN_VAL + read_coeff(cat1_prob, 1, r); break; case CATEGORY2_TOKEN: val = CAT2_MIN_VAL + read_coeff(cat2_prob, 2, r); break; case CATEGORY3_TOKEN: val = CAT3_MIN_VAL + read_coeff(cat3_prob, 3, r); break; case CATEGORY4_TOKEN: val = CAT4_MIN_VAL + read_coeff(cat4_prob, 4, r); break; case CATEGORY5_TOKEN: val = CAT5_MIN_VAL + read_coeff(cat5_prob, 5, r); break; case CATEGORY6_TOKEN: #if CONFIG_VP9_HIGHBITDEPTH switch (cm->bit_depth) { case VPX_BITS_8: val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r); break; case VPX_BITS_10: val = CAT6_MIN_VAL + read_coeff(cat6_prob, 16, r); break; case VPX_BITS_12: val = CAT6_MIN_VAL + read_coeff(cat6_prob, 18, r); break; default: assert(0); return -1; } #else val = CAT6_MIN_VAL + read_coeff(cat6_prob, 14, r); #endif break; } } v = (val * dqv) >> dq_shift; #if CONFIG_COEFFICIENT_RANGE_CHECKING #if CONFIG_VP9_HIGHBITDEPTH dqcoeff[scan[c]] = highbd_check_range((vp9_read_bit(r) ? -v : v), cm->bit_depth); #else dqcoeff[scan[c]] = check_range(vp9_read_bit(r) ? -v : v); #endif // CONFIG_VP9_HIGHBITDEPTH #else dqcoeff[scan[c]] = vp9_read_bit(r) ? -v : v; #endif // CONFIG_COEFFICIENT_RANGE_CHECKING token_cache[scan[c]] = vp9_pt_energy_class[token]; ++c; ctx = get_coef_context(nb, token_cache, c); dqv = dq[1]; } return c; }
static TX_MODE read_tx_mode(vp9_reader *r) { TX_MODE tx_mode = vp9_read_literal(r, 2); if (tx_mode == ALLOW_32X32) tx_mode += vp9_read_bit(r); return tx_mode; }
static INLINE COMPPREDMODE_TYPE read_comp_pred_mode(vp9_reader *r) { COMPPREDMODE_TYPE mode = vp9_read_bit(r); if (mode) mode += vp9_read_bit(r); return mode; }