| /* |
| * 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. |
| */ |
| |
| #ifndef AV1_COMMON_TXB_COMMON_H_ |
| #define AV1_COMMON_TXB_COMMON_H_ |
| extern const int16_t av1_coeff_band_4x4[16]; |
| |
| extern const int16_t av1_coeff_band_8x8[64]; |
| |
| extern const int16_t av1_coeff_band_16x16[256]; |
| |
| extern const int16_t av1_coeff_band_32x32[1024]; |
| |
| typedef struct txb_ctx { |
| int txb_skip_ctx; |
| int dc_sign_ctx; |
| } TXB_CTX; |
| |
| static INLINE TX_SIZE get_txsize_context(TX_SIZE tx_size) { |
| return txsize_sqr_up_map[tx_size]; |
| } |
| |
| #define BASE_CONTEXT_POSITION_NUM 12 |
| static int base_ref_offset[BASE_CONTEXT_POSITION_NUM][2] = { |
| /* clang-format off*/ |
| { -2, 0 }, { -1, -1 }, { -1, 0 }, { -1, 1 }, { 0, -2 }, { 0, -1 }, { 0, 1 }, |
| { 0, 2 }, { 1, -1 }, { 1, 0 }, { 1, 1 }, { 2, 0 } |
| /* clang-format on*/ |
| }; |
| |
| static INLINE int get_level_count(const tran_low_t *tcoeffs, int stride, |
| int height, int row, int col, int level, |
| int (*nb_offset)[2], int nb_num) { |
| int count = 0; |
| for (int idx = 0; idx < nb_num; ++idx) { |
| const int ref_row = row + nb_offset[idx][0]; |
| const int ref_col = col + nb_offset[idx][1]; |
| const int pos = ref_row * stride + ref_col; |
| if (ref_row < 0 || ref_col < 0 || ref_row >= height || ref_col >= stride) |
| continue; |
| tran_low_t abs_coeff = abs(tcoeffs[pos]); |
| count += abs_coeff > level; |
| } |
| return count; |
| } |
| |
| static INLINE void get_mag(int *mag, const tran_low_t *tcoeffs, int stride, |
| int height, int row, int col, int (*nb_offset)[2], |
| int nb_num) { |
| mag[0] = 0; |
| mag[1] = 0; |
| for (int idx = 0; idx < nb_num; ++idx) { |
| const int ref_row = row + nb_offset[idx][0]; |
| const int ref_col = col + nb_offset[idx][1]; |
| const int pos = ref_row * stride + ref_col; |
| if (ref_row < 0 || ref_col < 0 || ref_row >= height || ref_col >= stride) |
| continue; |
| tran_low_t abs_coeff = abs(tcoeffs[pos]); |
| if (nb_offset[idx][0] >= 0 && nb_offset[idx][1] >= 0) { |
| if (abs_coeff > mag[0]) { |
| mag[0] = abs_coeff; |
| mag[1] = 1; |
| } else if (abs_coeff == mag[0]) { |
| ++mag[1]; |
| } |
| } |
| } |
| } |
| static INLINE int get_level_count_mag(int *mag, const tran_low_t *tcoeffs, |
| int stride, int height, int row, int col, |
| int level, int (*nb_offset)[2], |
| int nb_num) { |
| int count = 0; |
| *mag = 0; |
| for (int idx = 0; idx < nb_num; ++idx) { |
| const int ref_row = row + nb_offset[idx][0]; |
| const int ref_col = col + nb_offset[idx][1]; |
| const int pos = ref_row * stride + ref_col; |
| if (ref_row < 0 || ref_col < 0 || ref_row >= height || ref_col >= stride) |
| continue; |
| tran_low_t abs_coeff = abs(tcoeffs[pos]); |
| count += abs_coeff > level; |
| if (nb_offset[idx][0] >= 0 && nb_offset[idx][1] >= 0) |
| *mag = AOMMAX(*mag, abs_coeff); |
| } |
| return count; |
| } |
| |
| static INLINE int get_base_ctx_from_count_mag(int row, int col, int count, |
| int mag, int level) { |
| const int ctx = (count + 1) >> 1; |
| const int sig_mag = mag > level; |
| int ctx_idx = -1; |
| if (row == 0 && col == 0) { |
| ctx_idx = (ctx << 1) + sig_mag; |
| assert(ctx_idx < 8); |
| } else if (row == 0) { |
| ctx_idx = 8 + (ctx << 1) + sig_mag; |
| assert(ctx_idx < 18); |
| } else if (col == 0) { |
| ctx_idx = 8 + 10 + (ctx << 1) + sig_mag; |
| assert(ctx_idx < 28); |
| } else { |
| ctx_idx = 8 + 10 + 10 + (ctx << 1) + sig_mag; |
| assert(ctx_idx < COEFF_BASE_CONTEXTS); |
| } |
| return ctx_idx; |
| } |
| |
| static INLINE int get_base_ctx(const tran_low_t *tcoeffs, |
| int c, // raster order |
| const int bwl, const int height, |
| const int level) { |
| const int stride = 1 << bwl; |
| const int row = c >> bwl; |
| const int col = c - (row << bwl); |
| const int level_minus_1 = level - 1; |
| int mag; |
| int count = get_level_count_mag(&mag, tcoeffs, stride, height, row, col, |
| level_minus_1, base_ref_offset, |
| BASE_CONTEXT_POSITION_NUM); |
| int ctx_idx = get_base_ctx_from_count_mag(row, col, count, mag, level); |
| return ctx_idx; |
| } |
| |
| #define BR_CONTEXT_POSITION_NUM 8 // Base range coefficient context |
| static int br_ref_offset[BR_CONTEXT_POSITION_NUM][2] = { |
| /* clang-format off*/ |
| { -1, -1 }, { -1, 0 }, { -1, 1 }, { 0, -1 }, |
| { 0, 1 }, { 1, -1 }, { 1, 0 }, { 1, 1 }, |
| /* clang-format on*/ |
| }; |
| |
| static int br_level_map[9] = { |
| 0, 0, 1, 1, 2, 2, 3, 3, 3, |
| }; |
| |
| #define BR_MAG_OFFSET 1 |
| // TODO(angiebird): optimize this function by using a table to map from |
| // count/mag to ctx |
| static INLINE int get_br_ctx_from_count_mag(int row, int col, int count, |
| int mag) { |
| int offset = 0; |
| if (mag <= BR_MAG_OFFSET) |
| offset = 0; |
| else if (mag <= 3) |
| offset = 1; |
| else if (mag <= 6) |
| offset = 2; |
| else |
| offset = 3; |
| |
| int ctx = br_level_map[count]; |
| ctx += offset * BR_TMP_OFFSET; |
| |
| // DC: 0 - 1 |
| if (row == 0 && col == 0) return ctx; |
| |
| // Top row: 2 - 4 |
| if (row == 0) return 2 + ctx; |
| |
| // Left column: 5 - 7 |
| if (col == 0) return 5 + ctx; |
| |
| // others: 8 - 11 |
| return 8 + ctx; |
| } |
| |
| static INLINE int get_br_ctx(const tran_low_t *tcoeffs, |
| const int c, // raster order |
| const int bwl, const int height) { |
| const int stride = 1 << bwl; |
| const int row = c >> bwl; |
| const int col = c - (row << bwl); |
| const int level_minus_1 = NUM_BASE_LEVELS; |
| int mag; |
| const int count = get_level_count_mag(&mag, tcoeffs, stride, height, row, col, |
| level_minus_1, br_ref_offset, |
| BR_CONTEXT_POSITION_NUM); |
| const int ctx = get_br_ctx_from_count_mag(row, col, count, mag); |
| return ctx; |
| } |
| |
| #define SIG_REF_OFFSET_NUM 11 |
| static int sig_ref_offset[SIG_REF_OFFSET_NUM][2] = { |
| { -2, -1 }, { -2, 0 }, { -2, 1 }, { -1, -2 }, { -1, -1 }, { -1, 0 }, |
| { -1, 1 }, { 0, -2 }, { 0, -1 }, { 1, -2 }, { 1, -1 }, |
| }; |
| |
| static INLINE int get_nz_count(const tran_low_t *tcoeffs, int stride, |
| int height, int row, int col, |
| const int16_t *iscan) { |
| int count = 0; |
| const int pos = row * stride + col; |
| for (int idx = 0; idx < SIG_REF_OFFSET_NUM; ++idx) { |
| const int ref_row = row + sig_ref_offset[idx][0]; |
| const int ref_col = col + sig_ref_offset[idx][1]; |
| if (ref_row < 0 || ref_col < 0 || ref_row >= height || ref_col >= stride) |
| continue; |
| const int nb_pos = ref_row * stride + ref_col; |
| if (iscan[nb_pos] < iscan[pos]) count += (tcoeffs[nb_pos] != 0); |
| } |
| return count; |
| } |
| |
| // TODO(angiebird): optimize this function by generate a table that maps from |
| // count to ctx |
| static INLINE int get_nz_map_ctx_from_count(int count, |
| const tran_low_t *tcoeffs, |
| int coeff_idx, // raster order |
| int bwl, const int16_t *iscan) { |
| const int row = coeff_idx >> bwl; |
| const int col = coeff_idx - (row << bwl); |
| int ctx = 0; |
| |
| if (row == 0 && col == 0) return 0; |
| |
| if (row == 0 && col == 1) return 1 + (tcoeffs[0] != 0); |
| |
| if (row == 1 && col == 0) return 3 + (tcoeffs[0] != 0); |
| |
| if (row == 1 && col == 1) { |
| int pos; |
| ctx = (tcoeffs[0] != 0); |
| |
| if (iscan[1] < iscan[coeff_idx]) ctx += (tcoeffs[1] != 0); |
| pos = 1 << bwl; |
| if (iscan[pos] < iscan[coeff_idx]) ctx += (tcoeffs[pos] != 0); |
| |
| ctx = (ctx + 1) >> 1; |
| |
| assert(5 + ctx <= 7); |
| |
| return 5 + ctx; |
| } |
| |
| if (row == 0) { |
| ctx = (count + 1) >> 1; |
| |
| assert(ctx < 3); |
| return 8 + ctx; |
| } |
| |
| if (col == 0) { |
| ctx = (count + 1) >> 1; |
| |
| assert(ctx < 3); |
| return 11 + ctx; |
| } |
| |
| ctx = count >> 1; |
| |
| assert(14 + ctx < 20); |
| |
| return 14 + ctx; |
| } |
| |
| static INLINE int get_nz_map_ctx(const tran_low_t *tcoeffs, |
| const int coeff_idx, // raster order |
| const int bwl, const int height, |
| const int16_t *iscan) { |
| int stride = 1 << bwl; |
| const int row = coeff_idx >> bwl; |
| const int col = coeff_idx - (row << bwl); |
| int count = get_nz_count(tcoeffs, stride, height, row, col, iscan); |
| return get_nz_map_ctx_from_count(count, tcoeffs, coeff_idx, bwl, iscan); |
| } |
| |
| static INLINE int get_eob_ctx(const tran_low_t *tcoeffs, |
| const int coeff_idx, // raster order |
| const TX_SIZE txs_ctx) { |
| (void)tcoeffs; |
| if (txs_ctx == TX_4X4) return av1_coeff_band_4x4[coeff_idx]; |
| if (txs_ctx == TX_8X8) return av1_coeff_band_8x8[coeff_idx]; |
| if (txs_ctx == TX_16X16) return av1_coeff_band_16x16[coeff_idx]; |
| if (txs_ctx == TX_32X32) return av1_coeff_band_32x32[coeff_idx]; |
| |
| assert(0); |
| return 0; |
| } |
| |
| static INLINE void set_dc_sign(int *cul_level, tran_low_t v) { |
| if (v < 0) |
| *cul_level |= 1 << COEFF_CONTEXT_BITS; |
| else if (v > 0) |
| *cul_level += 2 << COEFF_CONTEXT_BITS; |
| } |
| |
| static INLINE int get_dc_sign_ctx(int dc_sign) { |
| int dc_sign_ctx = 0; |
| if (dc_sign < 0) |
| dc_sign_ctx = 1; |
| else if (dc_sign > 0) |
| dc_sign_ctx = 2; |
| |
| return dc_sign_ctx; |
| } |
| |
| static INLINE void get_txb_ctx(BLOCK_SIZE plane_bsize, TX_SIZE tx_size, |
| int plane, const ENTROPY_CONTEXT *a, |
| const ENTROPY_CONTEXT *l, TXB_CTX *txb_ctx) { |
| const int txb_w_unit = tx_size_wide_unit[tx_size]; |
| const int txb_h_unit = tx_size_high_unit[tx_size]; |
| int ctx_offset = (plane == 0) ? 0 : 7; |
| |
| if (plane_bsize > txsize_to_bsize[tx_size]) ctx_offset += 3; |
| |
| int dc_sign = 0; |
| for (int k = 0; k < txb_w_unit; ++k) { |
| int sign = ((uint8_t)a[k]) >> COEFF_CONTEXT_BITS; |
| if (sign == 1) |
| --dc_sign; |
| else if (sign == 2) |
| ++dc_sign; |
| else if (sign != 0) |
| assert(0); |
| } |
| |
| for (int k = 0; k < txb_h_unit; ++k) { |
| int sign = ((uint8_t)l[k]) >> COEFF_CONTEXT_BITS; |
| if (sign == 1) |
| --dc_sign; |
| else if (sign == 2) |
| ++dc_sign; |
| else if (sign != 0) |
| assert(0); |
| } |
| |
| txb_ctx->dc_sign_ctx = get_dc_sign_ctx(dc_sign); |
| |
| if (plane == 0) { |
| int top = 0; |
| int left = 0; |
| |
| for (int k = 0; k < txb_w_unit; ++k) { |
| top = AOMMAX(top, ((uint8_t)a[k] & COEFF_CONTEXT_MASK)); |
| } |
| |
| for (int k = 0; k < txb_h_unit; ++k) { |
| left = AOMMAX(left, ((uint8_t)l[k] & COEFF_CONTEXT_MASK)); |
| } |
| |
| top = AOMMIN(top, 255); |
| left = AOMMIN(left, 255); |
| |
| if (plane_bsize == txsize_to_bsize[tx_size]) |
| txb_ctx->txb_skip_ctx = 0; |
| else if (top == 0 && left == 0) |
| txb_ctx->txb_skip_ctx = 1; |
| else if (top == 0 || left == 0) |
| txb_ctx->txb_skip_ctx = 2 + (AOMMAX(top, left) > 3); |
| else if (AOMMAX(top, left) <= 3) |
| txb_ctx->txb_skip_ctx = 4; |
| else if (AOMMIN(top, left) <= 3) |
| txb_ctx->txb_skip_ctx = 5; |
| else |
| txb_ctx->txb_skip_ctx = 6; |
| } else { |
| int ctx_base = get_entropy_context(tx_size, a, l); |
| txb_ctx->txb_skip_ctx = ctx_offset + ctx_base; |
| } |
| } |
| |
| void av1_adapt_txb_probs(AV1_COMMON *cm, unsigned int count_sat, |
| unsigned int update_factor); |
| #endif // AV1_COMMON_TXB_COMMON_H_ |
