diff options
Diffstat (limited to 'third_party/aom/av1/decoder/decodetxb.c')
| -rw-r--r-- | third_party/aom/av1/decoder/decodetxb.c | 286 |
1 files changed, 286 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 000000000..e1db09775 --- /dev/null +++ b/third_party/aom/av1/decoder/decodetxb.c @@ -0,0 +1,286 @@ +/* + * 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/common/scan.h" +#include "av1/common/idct.h" +#include "av1/common/txb_common.h" +#include "av1/decoder/decodemv.h" +#include "av1/decoder/decodetxb.h" +#include "av1/decoder/dsubexp.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 >= 32) { + 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; +} + +uint8_t av1_read_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCKD *xd, + aom_reader *r, int block, int plane, + tran_low_t *tcoeffs, TXB_CTX *txb_ctx, + int16_t *max_scan_line, int *eob) { + FRAME_COUNTS *counts = xd->counts; + TX_SIZE tx_size = get_tx_size(plane, xd); + PLANE_TYPE plane_type = get_plane_type(plane); + aom_prob *nz_map = cm->fc->nz_map[tx_size][plane_type]; + aom_prob *eob_flag = cm->fc->eob_flag[tx_size][plane_type]; + MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi; + const int seg_eob = tx_size_2d[tx_size]; + int c = 0; + int update_eob = -1; + const int16_t *const dequant = xd->plane[plane].seg_dequant[mbmi->segment_id]; + const int shift = av1_get_tx_scale(tx_size); + const int bwl = b_width_log2_lookup[txsize_to_bsize[tx_size]] + 2; + int cul_level = 0; + unsigned int(*nz_map_count)[SIG_COEF_CONTEXTS][2]; + uint8_t txb_mask[32 * 32] = { 0 }; + + nz_map_count = (counts) ? &counts->nz_map[tx_size][plane_type] : NULL; + + memset(tcoeffs, 0, sizeof(*tcoeffs) * seg_eob); + + int all_zero = + aom_read(r, cm->fc->txb_skip[tx_size][txb_ctx->txb_skip_ctx], ACCT_STR); + if (xd->counts) + ++xd->counts->txb_skip[tx_size][txb_ctx->txb_skip_ctx][all_zero]; + + *eob = 0; + if (all_zero) { + *max_scan_line = 0; + return 0; + } + +#if CONFIG_TXK_SEL + av1_read_tx_type(cm, xd, block, plane, r); +#endif + TX_TYPE tx_type = get_tx_type(plane_type, xd, block, tx_size); + const SCAN_ORDER *const scan_order = + get_scan(cm, tx_size, tx_type, is_inter_block(mbmi)); + const int16_t *scan = scan_order->scan; + + for (c = 0; c < seg_eob; ++c) { + int is_nz; + int coeff_ctx = get_nz_map_ctx(tcoeffs, txb_mask, scan[c], bwl); + int eob_ctx = get_eob_ctx(tcoeffs, scan[c], bwl); + + if (c < seg_eob - 1) + is_nz = aom_read(r, nz_map[coeff_ctx], tx_size); + else + is_nz = 1; + + // set non-zero coefficient map. + tcoeffs[scan[c]] = is_nz; + + if (c == seg_eob - 1) { + ++c; + break; + } + + if (counts) ++(*nz_map_count)[coeff_ctx][is_nz]; + + if (is_nz) { + int is_eob = aom_read(r, eob_flag[eob_ctx], tx_size); + if (counts) ++counts->eob_flag[tx_size][plane_type][eob_ctx][is_eob]; + if (is_eob) break; + } + txb_mask[scan[c]] = 1; + } + + *eob = AOMMIN(seg_eob, c + 1); + *max_scan_line = *eob; + + int i; + for (i = 0; i < NUM_BASE_LEVELS; ++i) { + aom_prob *coeff_base = cm->fc->coeff_base[tx_size][plane_type][i]; + + update_eob = 0; + for (c = *eob - 1; c >= 0; --c) { + tran_low_t *v = &tcoeffs[scan[c]]; + int sign; + int ctx; + + if (*v <= i) continue; + + ctx = get_base_ctx(tcoeffs, scan[c], bwl, i + 1); + + if (aom_read(r, coeff_base[ctx], tx_size)) { + *v = i + 1; + cul_level += i + 1; + + if (counts) ++counts->coeff_base[tx_size][plane_type][i][ctx][1]; + + if (c == 0) { + int dc_sign_ctx = txb_ctx->dc_sign_ctx; + sign = aom_read(r, cm->fc->dc_sign[plane_type][dc_sign_ctx], tx_size); + if (counts) ++counts->dc_sign[plane_type][dc_sign_ctx][sign]; + } else { + sign = aom_read_bit(r, ACCT_STR); + } + if (sign) *v = -(*v); + continue; + } + *v = i + 2; + if (counts) ++counts->coeff_base[tx_size][plane_type][i][ctx][0]; + + // update the eob flag for coefficients with magnitude above 1. + update_eob = AOMMAX(update_eob, c); + } + } + + for (c = update_eob; c >= 0; --c) { + tran_low_t *v = &tcoeffs[scan[c]]; + int sign; + int idx; + int ctx; + + if (*v <= NUM_BASE_LEVELS) continue; + + if (c == 0) { + int dc_sign_ctx = txb_ctx->dc_sign_ctx; + sign = aom_read(r, cm->fc->dc_sign[plane_type][dc_sign_ctx], tx_size); + if (counts) ++counts->dc_sign[plane_type][dc_sign_ctx][sign]; + } else { + sign = aom_read_bit(r, ACCT_STR); + } + + ctx = get_level_ctx(tcoeffs, scan[c], bwl); + + if (cm->fc->coeff_lps[tx_size][plane_type][ctx] == 0) exit(0); + + for (idx = 0; idx < COEFF_BASE_RANGE; ++idx) { + if (aom_read(r, cm->fc->coeff_lps[tx_size][plane_type][ctx], tx_size)) { + *v = (idx + 1 + NUM_BASE_LEVELS); + if (sign) *v = -(*v); + cul_level += abs(*v); + + if (counts) ++counts->coeff_lps[tx_size][plane_type][ctx][1]; + break; + } + if (counts) ++counts->coeff_lps[tx_size][plane_type][ctx][0]; + } + if (idx < COEFF_BASE_RANGE) continue; + + // decode 0-th order Golomb code + *v = read_golomb(xd, r) + COEFF_BASE_RANGE + 1 + NUM_BASE_LEVELS; + if (sign) *v = -(*v); + cul_level += abs(*v); + } + + for (c = 0; c < *eob; ++c) { + int16_t dqv = (c == 0) ? dequant[0] : dequant[1]; + tran_low_t *v = &tcoeffs[scan[c]]; + int sign = (*v) < 0; + *v = (abs(*v) * dqv) >> shift; + if (sign) *v = -(*v); + } + + cul_level = AOMMIN(63, cul_level); + + // DC value + set_dc_sign(&cul_level, tcoeffs[0]); + + return cul_level; +} + +uint8_t av1_read_coeffs_txb_facade(AV1_COMMON *cm, MACROBLOCKD *xd, + aom_reader *r, int row, int col, int block, + int plane, tran_low_t *tcoeffs, + int16_t *max_scan_line, int *eob) { + MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi; + struct macroblockd_plane *pd = &xd->plane[plane]; + + const BLOCK_SIZE bsize = mbmi->sb_type; +#if CONFIG_CB4X4 +#if CONFIG_CHROMA_2X2 + const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd); +#else + const BLOCK_SIZE plane_bsize = + AOMMAX(BLOCK_4X4, get_plane_block_size(bsize, pd)); +#endif // CONFIG_CHROMA_2X2 +#else // CONFIG_CB4X4 + const BLOCK_SIZE plane_bsize = + get_plane_block_size(AOMMAX(BLOCK_8X8, bsize), pd); +#endif // CONFIG_CB4X4 + + TX_SIZE tx_size = get_tx_size(plane, xd); + TXB_CTX txb_ctx; + get_txb_ctx(plane_bsize, tx_size, plane, pd->above_context + col, + pd->left_context + row, &txb_ctx); + uint8_t cul_level = av1_read_coeffs_txb(cm, xd, r, block, plane, tcoeffs, + &txb_ctx, max_scan_line, eob); +#if CONFIG_ADAPT_SCAN + PLANE_TYPE plane_type = get_plane_type(plane); + TX_TYPE tx_type = get_tx_type(plane_type, xd, block, tx_size); + if (xd->counts && *eob > 0) + av1_update_scan_count_facade(cm, xd->counts, tx_size, tx_type, pd->dqcoeff, + *eob); +#endif + av1_set_contexts(xd, pd, plane, tx_size, cul_level, col, row); + return cul_level; +} + +static void read_txb_probs(FRAME_CONTEXT *fc, const TX_SIZE tx_size, + aom_reader *r) { + int plane, ctx, level; + + if (aom_read_bit(r, ACCT_STR) == 0) return; + + for (ctx = 0; ctx < TXB_SKIP_CONTEXTS; ++ctx) + av1_diff_update_prob(r, &fc->txb_skip[tx_size][ctx], ACCT_STR); + + for (plane = 0; plane < PLANE_TYPES; ++plane) + for (ctx = 0; ctx < SIG_COEF_CONTEXTS; ++ctx) + av1_diff_update_prob(r, &fc->nz_map[tx_size][plane][ctx], ACCT_STR); + + for (plane = 0; plane < PLANE_TYPES; ++plane) + for (ctx = 0; ctx < EOB_COEF_CONTEXTS; ++ctx) + av1_diff_update_prob(r, &fc->eob_flag[tx_size][plane][ctx], ACCT_STR); + + for (level = 0; level < NUM_BASE_LEVELS; ++level) + for (plane = 0; plane < PLANE_TYPES; ++plane) + for (ctx = 0; ctx < COEFF_BASE_CONTEXTS; ++ctx) + av1_diff_update_prob(r, &fc->coeff_base[tx_size][plane][level][ctx], + ACCT_STR); + + for (plane = 0; plane < PLANE_TYPES; ++plane) + for (ctx = 0; ctx < LEVEL_CONTEXTS; ++ctx) + av1_diff_update_prob(r, &fc->coeff_lps[tx_size][plane][ctx], ACCT_STR); +} + +void av1_read_txb_probs(FRAME_CONTEXT *fc, TX_MODE tx_mode, aom_reader *r) { + const TX_SIZE max_tx_size = tx_mode_to_biggest_tx_size[tx_mode]; + TX_SIZE tx_size; + int ctx, plane; + for (plane = 0; plane < PLANE_TYPES; ++plane) + for (ctx = 0; ctx < DC_SIGN_CONTEXTS; ++ctx) + av1_diff_update_prob(r, &fc->dc_sign[plane][ctx], ACCT_STR); + + for (tx_size = TX_4X4; tx_size <= max_tx_size; ++tx_size) + read_txb_probs(fc, tx_size, r); +} |