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-rw-r--r--third_party/aom/av1/decoder/decodetxb.c362
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
+}
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