224 lines
7.7 KiB
C
224 lines
7.7 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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#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/common/vp9_entropy.h"
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#if CONFIG_COEFFICIENT_RANGE_CHECKING
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#include "vp9/common/vp9_idct.h"
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#endif
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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 INCREMENT_COUNT(token) \
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do { \
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if (counts) \
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++coef_counts[band][ctx][token]; \
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} while (0)
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static INLINE int read_coeff(const vpx_prob *probs, int n, vpx_reader *r) {
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int i, val = 0;
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for (i = 0; i < n; ++i)
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val = (val << 1) | vpx_read(r, probs[i]);
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return val;
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}
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static int decode_coefs(const MACROBLOCKD *xd,
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PLANE_TYPE type,
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tran_low_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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vpx_reader *r) {
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FRAME_COUNTS *counts = xd->counts;
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const int max_eob = 16 << (tx_size << 1);
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const FRAME_CONTEXT *const fc = xd->fc;
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const int ref = is_inter_block(xd->mi[0]);
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int band, c = 0;
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const vpx_prob (*coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
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fc->coef_probs[tx_size][type][ref];
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const vpx_prob *prob;
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unsigned int (*coef_counts)[COEFF_CONTEXTS][UNCONSTRAINED_NODES + 1];
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unsigned int (*eob_branch_count)[COEFF_CONTEXTS];
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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, token;
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int16_t dqv = dq[0];
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const uint8_t *const cat6_prob =
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#if CONFIG_VP9_HIGHBITDEPTH
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(xd->bd == VPX_BITS_12) ? vp9_cat6_prob_high12 :
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(xd->bd == VPX_BITS_10) ? vp9_cat6_prob_high12 + 2 :
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#endif // CONFIG_VP9_HIGHBITDEPTH
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vp9_cat6_prob;
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const int cat6_bits =
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#if CONFIG_VP9_HIGHBITDEPTH
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(xd->bd == VPX_BITS_12) ? 18 :
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(xd->bd == VPX_BITS_10) ? 16 :
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#endif // CONFIG_VP9_HIGHBITDEPTH
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14;
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if (counts) {
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coef_counts = counts->coef[tx_size][type][ref];
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eob_branch_count = counts->eob_branch[tx_size][type][ref];
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}
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while (c < max_eob) {
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int val = -1;
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band = *band_translate++;
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prob = coef_probs[band][ctx];
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if (counts)
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++eob_branch_count[band][ctx];
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if (!vpx_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 (!vpx_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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if (!vpx_read(r, prob[ONE_CONTEXT_NODE])) {
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INCREMENT_COUNT(ONE_TOKEN);
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token = ONE_TOKEN;
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val = 1;
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} else {
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INCREMENT_COUNT(TWO_TOKEN);
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token = vpx_read_tree(r, vp9_coef_con_tree,
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vp9_pareto8_full[prob[PIVOT_NODE] - 1]);
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switch (token) {
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case TWO_TOKEN:
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case THREE_TOKEN:
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case FOUR_TOKEN:
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val = token;
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break;
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case CATEGORY1_TOKEN:
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val = CAT1_MIN_VAL + read_coeff(vp9_cat1_prob, 1, r);
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break;
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case CATEGORY2_TOKEN:
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val = CAT2_MIN_VAL + read_coeff(vp9_cat2_prob, 2, r);
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break;
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case CATEGORY3_TOKEN:
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val = CAT3_MIN_VAL + read_coeff(vp9_cat3_prob, 3, r);
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break;
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case CATEGORY4_TOKEN:
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val = CAT4_MIN_VAL + read_coeff(vp9_cat4_prob, 4, r);
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break;
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case CATEGORY5_TOKEN:
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val = CAT5_MIN_VAL + read_coeff(vp9_cat5_prob, 5, r);
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break;
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case CATEGORY6_TOKEN:
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val = CAT6_MIN_VAL + read_coeff(cat6_prob, cat6_bits, r);
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break;
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}
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}
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v = (val * dqv) >> dq_shift;
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#if CONFIG_COEFFICIENT_RANGE_CHECKING
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#if CONFIG_VP9_HIGHBITDEPTH
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dqcoeff[scan[c]] = highbd_check_range((vpx_read_bit(r) ? -v : v),
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xd->bd);
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#else
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dqcoeff[scan[c]] = check_range(vpx_read_bit(r) ? -v : v);
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#endif // CONFIG_VP9_HIGHBITDEPTH
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#else
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dqcoeff[scan[c]] = vpx_read_bit(r) ? -v : v;
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#endif // CONFIG_COEFFICIENT_RANGE_CHECKING
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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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}
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return c;
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}
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static void get_ctx_shift(MACROBLOCKD *xd, int *ctx_shift_a, int *ctx_shift_l,
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int x, int y, unsigned int tx_size_in_blocks) {
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if (xd->max_blocks_wide) {
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if (tx_size_in_blocks + x > xd->max_blocks_wide)
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*ctx_shift_a = (tx_size_in_blocks - (xd->max_blocks_wide - x)) * 8;
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}
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if (xd->max_blocks_high) {
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if (tx_size_in_blocks + y > xd->max_blocks_high)
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*ctx_shift_l = (tx_size_in_blocks - (xd->max_blocks_high - y)) * 8;
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}
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}
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int vp9_decode_block_tokens(MACROBLOCKD *xd, int plane, const scan_order *sc,
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int x, int y, TX_SIZE tx_size, vpx_reader *r,
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int seg_id) {
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struct macroblockd_plane *const pd = &xd->plane[plane];
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const int16_t *const dequant = pd->seg_dequant[seg_id];
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int eob;
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ENTROPY_CONTEXT *a = pd->above_context + x;
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ENTROPY_CONTEXT *l = pd->left_context + y;
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int ctx;
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int ctx_shift_a = 0;
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int ctx_shift_l = 0;
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switch (tx_size) {
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case TX_4X4:
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ctx = a[0] != 0;
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ctx += l[0] != 0;
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eob = decode_coefs(xd, get_plane_type(plane), pd->dqcoeff, tx_size,
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dequant, ctx, sc->scan, sc->neighbors, r);
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a[0] = l[0] = (eob > 0);
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break;
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case TX_8X8:
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get_ctx_shift(xd, &ctx_shift_a, &ctx_shift_l, x, y, 1 << TX_8X8);
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ctx = !!*(const uint16_t *)a;
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ctx += !!*(const uint16_t *)l;
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eob = decode_coefs(xd, get_plane_type(plane), pd->dqcoeff, tx_size,
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dequant, ctx, sc->scan, sc->neighbors, r);
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*(uint16_t *)a = ((eob > 0) * 0x0101) >> ctx_shift_a;
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*(uint16_t *)l = ((eob > 0) * 0x0101) >> ctx_shift_l;
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break;
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case TX_16X16:
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get_ctx_shift(xd, &ctx_shift_a, &ctx_shift_l, x, y, 1 << TX_16X16);
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ctx = !!*(const uint32_t *)a;
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ctx += !!*(const uint32_t *)l;
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eob = decode_coefs(xd, get_plane_type(plane), pd->dqcoeff, tx_size,
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dequant, ctx, sc->scan, sc->neighbors, r);
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*(uint32_t *)a = ((eob > 0) * 0x01010101) >> ctx_shift_a;
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*(uint32_t *)l = ((eob > 0) * 0x01010101) >> ctx_shift_l;
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break;
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case TX_32X32:
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get_ctx_shift(xd, &ctx_shift_a, &ctx_shift_l, x, y, 1 << TX_32X32);
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// NOTE: casting to uint64_t here is safe because the default memory
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// alignment is at least 8 bytes and the TX_32X32 is aligned on 8 byte
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// boundaries.
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ctx = !!*(const uint64_t *)a;
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ctx += !!*(const uint64_t *)l;
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eob = decode_coefs(xd, get_plane_type(plane), pd->dqcoeff, tx_size,
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dequant, ctx, sc->scan, sc->neighbors, r);
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*(uint64_t *)a = ((eob > 0) * 0x0101010101010101ULL) >> ctx_shift_a;
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*(uint64_t *)l = ((eob > 0) * 0x0101010101010101ULL) >> ctx_shift_l;
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break;
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default:
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assert(0 && "Invalid transform size.");
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eob = 0;
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break;
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}
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return eob;
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}
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