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Diffstat (limited to '')
| -rw-r--r-- | third_party/aom/av1/decoder/decodetxb.c | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/third_party/aom/av1/decoder/decodetxb.c b/third_party/aom/av1/decoder/decodetxb.c new file mode 100644 index 0000000000..f3ef2d55e4 --- /dev/null +++ b/third_party/aom/av1/decoder/decodetxb.c @@ -0,0 +1,362 @@ +/* + * Copyright (c) 2017, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +#include "av1/decoder/decodetxb.h" + +#include "aom_ports/mem.h" +#include "av1/common/idct.h" +#include "av1/common/scan.h" +#include "av1/common/txb_common.h" +#include "av1/decoder/decodemv.h" + +#define ACCT_STR __func__ + +static int read_golomb(MACROBLOCKD *xd, aom_reader *r) { + int x = 1; + int length = 0; + int i = 0; + + while (!i) { + i = aom_read_bit(r, ACCT_STR); + ++length; + if (length > 20) { + aom_internal_error(xd->error_info, AOM_CODEC_CORRUPT_FRAME, + "Invalid length in read_golomb"); + break; + } + } + + for (i = 0; i < length - 1; ++i) { + x <<= 1; + x += aom_read_bit(r, ACCT_STR); + } + + return x - 1; +} + +static INLINE int rec_eob_pos(const int eob_token, const int extra) { + int eob = k_eob_group_start[eob_token]; + if (eob > 2) { + eob += extra; + } + return eob; +} + +static INLINE int get_dqv(const int16_t *dequant, int coeff_idx, + const qm_val_t *iqmatrix) { + int dqv = dequant[!!coeff_idx]; + if (iqmatrix != NULL) + dqv = + ((iqmatrix[coeff_idx] * dqv) + (1 << (AOM_QM_BITS - 1))) >> AOM_QM_BITS; + return dqv; +} + +static INLINE void read_coeffs_reverse_2d(aom_reader *r, TX_SIZE tx_size, + int start_si, int end_si, + const int16_t *scan, int bwl, + uint8_t *levels, + base_cdf_arr base_cdf, + br_cdf_arr br_cdf) { + for (int c = end_si; c >= start_si; --c) { + const int pos = scan[c]; + const int coeff_ctx = get_lower_levels_ctx_2d(levels, pos, bwl, tx_size); + const int nsymbs = 4; + int level = aom_read_symbol(r, base_cdf[coeff_ctx], nsymbs, ACCT_STR); + if (level > NUM_BASE_LEVELS) { + const int br_ctx = get_br_ctx_2d(levels, pos, bwl); + aom_cdf_prob *cdf = br_cdf[br_ctx]; + for (int idx = 0; idx < COEFF_BASE_RANGE; idx += BR_CDF_SIZE - 1) { + const int k = aom_read_symbol(r, cdf, BR_CDF_SIZE, ACCT_STR); + level += k; + if (k < BR_CDF_SIZE - 1) break; + } + } + levels[get_padded_idx(pos, bwl)] = level; + } +} + +static INLINE void read_coeffs_reverse(aom_reader *r, TX_SIZE tx_size, + TX_CLASS tx_class, int start_si, + int end_si, const int16_t *scan, int bwl, + uint8_t *levels, base_cdf_arr base_cdf, + br_cdf_arr br_cdf) { + for (int c = end_si; c >= start_si; --c) { + const int pos = scan[c]; + const int coeff_ctx = + get_lower_levels_ctx(levels, pos, bwl, tx_size, tx_class); + const int nsymbs = 4; + int level = aom_read_symbol(r, base_cdf[coeff_ctx], nsymbs, ACCT_STR); + if (level > NUM_BASE_LEVELS) { + const int br_ctx = get_br_ctx(levels, pos, bwl, tx_class); + aom_cdf_prob *cdf = br_cdf[br_ctx]; + for (int idx = 0; idx < COEFF_BASE_RANGE; idx += BR_CDF_SIZE - 1) { + const int k = aom_read_symbol(r, cdf, BR_CDF_SIZE, ACCT_STR); + level += k; + if (k < BR_CDF_SIZE - 1) break; + } + } + levels[get_padded_idx(pos, bwl)] = level; + } +} + +uint8_t av1_read_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCKD *const xd, + aom_reader *const r, const int blk_row, + const int blk_col, const int plane, + const TXB_CTX *const txb_ctx, + const TX_SIZE tx_size) { + FRAME_CONTEXT *const ec_ctx = xd->tile_ctx; + const int32_t max_value = (1 << (7 + xd->bd)) - 1; + const int32_t min_value = -(1 << (7 + xd->bd)); + const TX_SIZE txs_ctx = get_txsize_entropy_ctx(tx_size); + const PLANE_TYPE plane_type = get_plane_type(plane); + MB_MODE_INFO *const mbmi = xd->mi[0]; + struct macroblockd_plane *const pd = &xd->plane[plane]; + const int16_t *const dequant = pd->seg_dequant_QTX[mbmi->segment_id]; + tran_low_t *const tcoeffs = pd->dqcoeff_block + xd->cb_offset[plane]; + const int shift = av1_get_tx_scale(tx_size); + const int bwl = get_txb_bwl(tx_size); + const int width = get_txb_wide(tx_size); + const int height = get_txb_high(tx_size); + int cul_level = 0; + int dc_val = 0; + uint8_t levels_buf[TX_PAD_2D]; + uint8_t *const levels = set_levels(levels_buf, width); + const int all_zero = aom_read_symbol( + r, ec_ctx->txb_skip_cdf[txs_ctx][txb_ctx->txb_skip_ctx], 2, ACCT_STR); + eob_info *eob_data = pd->eob_data + xd->txb_offset[plane]; + uint16_t *const eob = &(eob_data->eob); + uint16_t *const max_scan_line = &(eob_data->max_scan_line); + *max_scan_line = 0; + *eob = 0; + if (all_zero) { + *max_scan_line = 0; + if (plane == 0) { + const int txk_type_idx = + av1_get_txk_type_index(mbmi->sb_type, blk_row, blk_col); + mbmi->txk_type[txk_type_idx] = DCT_DCT; + } + return 0; + } + + memset(levels_buf, 0, + sizeof(*levels_buf) * + ((width + TX_PAD_HOR) * (height + TX_PAD_VER) + TX_PAD_END)); + if (plane == AOM_PLANE_Y) { + // only y plane's tx_type is transmitted + av1_read_tx_type(cm, xd, blk_row, blk_col, tx_size, r); + } + const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, blk_row, blk_col, + tx_size, cm->reduced_tx_set_used); + const TX_CLASS tx_class = tx_type_to_class[tx_type]; + const TX_SIZE qm_tx_size = av1_get_adjusted_tx_size(tx_size); + const qm_val_t *iqmatrix = + IS_2D_TRANSFORM(tx_type) + ? pd->seg_iqmatrix[mbmi->segment_id][qm_tx_size] + : cm->giqmatrix[NUM_QM_LEVELS - 1][0][qm_tx_size]; + const SCAN_ORDER *const scan_order = get_scan(tx_size, tx_type); + const int16_t *const scan = scan_order->scan; + int eob_extra = 0; + int eob_pt = 1; + + const int eob_multi_size = txsize_log2_minus4[tx_size]; + const int eob_multi_ctx = (tx_class == TX_CLASS_2D) ? 0 : 1; + switch (eob_multi_size) { + case 0: + eob_pt = + aom_read_symbol(r, ec_ctx->eob_flag_cdf16[plane_type][eob_multi_ctx], + 5, ACCT_STR) + + 1; + break; + case 1: + eob_pt = + aom_read_symbol(r, ec_ctx->eob_flag_cdf32[plane_type][eob_multi_ctx], + 6, ACCT_STR) + + 1; + break; + case 2: + eob_pt = + aom_read_symbol(r, ec_ctx->eob_flag_cdf64[plane_type][eob_multi_ctx], + 7, ACCT_STR) + + 1; + break; + case 3: + eob_pt = + aom_read_symbol(r, ec_ctx->eob_flag_cdf128[plane_type][eob_multi_ctx], + 8, ACCT_STR) + + 1; + break; + case 4: + eob_pt = + aom_read_symbol(r, ec_ctx->eob_flag_cdf256[plane_type][eob_multi_ctx], + 9, ACCT_STR) + + 1; + break; + case 5: + eob_pt = + aom_read_symbol(r, ec_ctx->eob_flag_cdf512[plane_type][eob_multi_ctx], + 10, ACCT_STR) + + 1; + break; + case 6: + default: + eob_pt = aom_read_symbol( + r, ec_ctx->eob_flag_cdf1024[plane_type][eob_multi_ctx], 11, + ACCT_STR) + + 1; + break; + } + + if (k_eob_offset_bits[eob_pt] > 0) { + const int eob_ctx = eob_pt - 3; + int bit = aom_read_symbol( + r, ec_ctx->eob_extra_cdf[txs_ctx][plane_type][eob_ctx], 2, ACCT_STR); + if (bit) { + eob_extra += (1 << (k_eob_offset_bits[eob_pt] - 1)); + } + + for (int i = 1; i < k_eob_offset_bits[eob_pt]; i++) { + bit = aom_read_bit(r, ACCT_STR); + if (bit) { + eob_extra += (1 << (k_eob_offset_bits[eob_pt] - 1 - i)); + } + } + } + *eob = rec_eob_pos(eob_pt, eob_extra); + + { + // Read the non-zero coefficient with scan index eob-1 + // TODO(angiebird): Put this into a function + const int c = *eob - 1; + const int pos = scan[c]; + const int coeff_ctx = get_lower_levels_ctx_eob(bwl, height, c); + const int nsymbs = 3; + aom_cdf_prob *cdf = + ec_ctx->coeff_base_eob_cdf[txs_ctx][plane_type][coeff_ctx]; + int level = aom_read_symbol(r, cdf, nsymbs, ACCT_STR) + 1; + if (level > NUM_BASE_LEVELS) { + const int br_ctx = get_br_ctx(levels, pos, bwl, tx_class); + for (int idx = 0; idx < COEFF_BASE_RANGE; idx += BR_CDF_SIZE - 1) { + const int k = aom_read_symbol( + r, + ec_ctx->coeff_br_cdf[AOMMIN(txs_ctx, TX_32X32)][plane_type][br_ctx], + BR_CDF_SIZE, ACCT_STR); + level += k; + if (k < BR_CDF_SIZE - 1) break; + } + } + levels[get_padded_idx(pos, bwl)] = level; + } + if (*eob > 1) { + base_cdf_arr base_cdf = ec_ctx->coeff_base_cdf[txs_ctx][plane_type]; + br_cdf_arr br_cdf = + ec_ctx->coeff_br_cdf[AOMMIN(txs_ctx, TX_32X32)][plane_type]; + if (tx_class == TX_CLASS_2D) { + read_coeffs_reverse_2d(r, tx_size, 1, *eob - 1 - 1, scan, bwl, levels, + base_cdf, br_cdf); + read_coeffs_reverse(r, tx_size, tx_class, 0, 0, scan, bwl, levels, + base_cdf, br_cdf); + } else { + read_coeffs_reverse(r, tx_size, tx_class, 0, *eob - 1 - 1, scan, bwl, + levels, base_cdf, br_cdf); + } + } + + int16_t num_zero_coeffs = 0; + for (int c = 0; c < *eob; ++c) { + const int pos = scan[c]; + num_zero_coeffs = AOMMAX(num_zero_coeffs, pos); + } + memset(tcoeffs, 0, (num_zero_coeffs + 1) * sizeof(tcoeffs[0])); + + for (int c = 0; c < *eob; ++c) { + const int pos = scan[c]; + uint8_t sign; + tran_low_t level = levels[get_padded_idx(pos, bwl)]; + if (level) { + *max_scan_line = AOMMAX(*max_scan_line, pos); + if (c == 0) { + const int dc_sign_ctx = txb_ctx->dc_sign_ctx; + sign = aom_read_symbol(r, ec_ctx->dc_sign_cdf[plane_type][dc_sign_ctx], + 2, ACCT_STR); + } else { + sign = aom_read_bit(r, ACCT_STR); + } + if (level >= MAX_BASE_BR_RANGE) { + level += read_golomb(xd, r); + } + + if (c == 0) dc_val = sign ? -level : level; + + // Bitmasking to clamp level to valid range: + // The valid range for 8/10/12 bit vdieo is at most 14/16/18 bit + level &= 0xfffff; + cul_level += level; + tran_low_t dq_coeff; + // Bitmasking to clamp dq_coeff to valid range: + // The valid range for 8/10/12 bit video is at most 17/19/21 bit + dq_coeff = (tran_low_t)( + (int64_t)level * get_dqv(dequant, scan[c], iqmatrix) & 0xffffff); + dq_coeff = dq_coeff >> shift; + if (sign) { + dq_coeff = -dq_coeff; + } + tcoeffs[pos] = clamp(dq_coeff, min_value, max_value); + } + } + + cul_level = AOMMIN(COEFF_CONTEXT_MASK, cul_level); + + // DC value + set_dc_sign(&cul_level, dc_val); + + return cul_level; +} + +void av1_read_coeffs_txb_facade(const AV1_COMMON *const cm, + MACROBLOCKD *const xd, aom_reader *const r, + const int plane, const int row, const int col, + const TX_SIZE tx_size) { +#if TXCOEFF_TIMER + struct aom_usec_timer timer; + aom_usec_timer_start(&timer); +#endif + MB_MODE_INFO *const mbmi = xd->mi[0]; + struct macroblockd_plane *const pd = &xd->plane[plane]; + + const BLOCK_SIZE bsize = mbmi->sb_type; + const BLOCK_SIZE plane_bsize = + get_plane_block_size(bsize, pd->subsampling_x, pd->subsampling_y); + + TXB_CTX txb_ctx; + get_txb_ctx(plane_bsize, tx_size, plane, pd->above_context + col, + pd->left_context + row, &txb_ctx); + const uint8_t cul_level = + av1_read_coeffs_txb(cm, xd, r, row, col, plane, &txb_ctx, tx_size); + av1_set_contexts(xd, pd, plane, plane_bsize, tx_size, cul_level, col, row); + + if (is_inter_block(mbmi)) { + PLANE_TYPE plane_type = get_plane_type(plane); + // tx_type will be read out in av1_read_coeffs_txb_facade + const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, row, col, tx_size, + cm->reduced_tx_set_used); + + if (plane == 0) + update_txk_array(mbmi->txk_type, mbmi->sb_type, row, col, tx_size, + tx_type); + } + +#if TXCOEFF_TIMER + aom_usec_timer_mark(&timer); + const int64_t elapsed_time = aom_usec_timer_elapsed(&timer); + cm->txcoeff_timer += elapsed_time; + ++cm->txb_count; +#endif +} |