/***************************************************************************** * This file is part of Kvazaar HEVC encoder. * * Copyright (c) 2021, Tampere University, ITU/ISO/IEC, project contributors * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright notice, this * list of conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. * * * Neither the name of the Tampere University or ITU/ISO/IEC nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY OUT OF THE USE OF THIS ****************************************************************************/ #include "context.h" #include "tables.h" static const uint8_t INIT_SAO_MERGE_FLAG[3] = { 153, 153, 153 }; static const uint8_t INIT_SAO_TYPE_IDX[3] = { 160, 185, 200 }; static const uint8_t INIT_QT_ROOT_CBF[3][1] = { { 79, }, { 79, }, { CNU, }, }; static const uint8_t INIT_MVP_IDX[3][2] = { { 168, CNU, }, { 168, CNU, }, { CNU, CNU, }, }; static const uint8_t INIT_REF_PIC[3][2] = { { 153, 153 }, { 153, 153 }, { CNU, CNU }, }; static const uint8_t INIT_MVD[3][2] = { { 169, 198, }, { 140, 198, }, { CNU, CNU, }, }; static const uint8_t INIT_MERGE_FLAG_EXT[3][1] = { { 154, }, { 110, }, { CNU, }, }; static const uint8_t INIT_MERGE_IDX_EXT[3][1] = { { 137, }, { 122, }, { CNU, }, }; static const uint8_t INIT_CU_TRANSQUANT_BYPASS[3][1] = { { 154, }, { 154, }, { 154, }, }; static const uint8_t INIT_SKIP_FLAG[3][3] = { { 197, 185, 201, }, { 197, 185, 201, }, { CNU, CNU, CNU, }, }; static const uint8_t INIT_PRED_MODE[3][1] = { { 134, }, { 149, }, { CNU, }, }; static const uint8_t INIT_PART_SIZE[3][4] = { { 154, 139, CNU, CNU, }, { 154, 139, CNU, CNU, }, { 184, CNU, CNU, CNU, }, }; static const uint8_t INIT_SPLIT_FLAG[3][3] = { { 107, 139, 126 }, { 107, 139, 126 }, { 139, 141, 157 }, }; static const uint8_t INIT_INTRA_PRED_MODE[3] = { 183, 154, 184 }; static const uint8_t INIT_CHROMA_PRED_MODE[3][2] = { { 152, 139 }, { 152, 139 }, { 63, 139 }, }; static const uint8_t INIT_INTER_DIR[3][5] = { { 95, 79, 63, 31, 31, }, { 95, 79, 63, 31, 31, }, { CNU, CNU, CNU, CNU, CNU, }, }; static const uint8_t INIT_TRANS_SUBDIV_FLAG[3][3] = { { 224, 167, 122 }, { 124, 138, 94 }, { 153, 138, 138 }, }; static const uint8_t INIT_QT_CBF[3][8] = { { 153, 111, CNU, CNU, 149, 92, 167, 154 }, { 153, 111, CNU, CNU, 149, 107, 167, 154 }, { 111, 141, CNU, CNU, 94, 138, 182, 154 }, }; static const uint8_t INIT_CU_QP_DELTA_ABS[3][2] = { { 154, 154 }, { 154, 154 }, { 154, 154 }, }; static const uint8_t INIT_SIG_CG_FLAG[3][4] = { { 121, 140, 61, 154 }, { 121, 140, 61, 154 }, { 91, 171, 134, 141 }, }; static const uint8_t INIT_SIG_FLAG[3][42] = { {170,154,139,153,139,123,123, 63,124,166, 183,140,136,153,154,166,183,140,136,153, 154,166,183,140,136,153,154,170,153,138, 138,122,121,122,121,167,151,183,140,151, 183,140}, {155,154,139,153,139,123,123,63,153,166, 183,140,136,153,154,166,183,140,136,153, 154,166,183,140,136,153,154,170,153,123, 123,107,121,107,121,167,151,183,140,151, 183,140}, {111,111,125,110,110,94,124,108,124,107, 125,141,179,153,125,107,125,141,179,153, 125,107,125,141,179,153,125,140,139,182, 182,152,136,152,136,153,136,139,111,136, 139,111}, }; static const uint8_t INIT_LAST[3][30] = { { 125, 110, 124, 110, 95, 94, 125, 111, 111, 79, 125, 126, 111, 111, 79, 108, 123, 93, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU }, { 125, 110, 94, 110, 95, 79, 125, 111, 110, 78, 110, 111, 111, 95, 94, 108, 123, 108, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU }, { 110, 110, 124, 125, 140, 153, 125, 127, 140, 109, 111, 143, 127, 111, 79, 108, 123, 63, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU, CNU }, }; static const uint8_t INIT_ONE_FLAG[3][24] = { {154,196,167,167,154,152,167,182,182,134,149,136,153,121,136,122,169,208,166,167,154,152,167,182}, {154,196,196,167,154,152,167,182,182,134,149,136,153,121,136,137,169,194,166,167,154,167,137,182}, {140, 92,137,138,140,152,138,139,153, 74,149, 92,139,107,122,152,140,179,166,182,140,227,122,197}, }; static const uint8_t INIT_ABS_FLAG[3][6] = { { 107,167, 91,107,107,167}, { 107,167, 91,122,107,167}, { 138,153,136,167,152,152}, }; static const uint8_t INIT_TRANSFORMSKIP_FLAG[3][2] = { { 139, 139}, { 139, 139}, { 139, 139}, }; /** * \brief Initialize struct cabac_ctx. */ void kvz_ctx_init(cabac_ctx_t *ctx, uint32_t qp, uint32_t init_value) { int slope = (init_value >> 4) * 5 - 45; int offset = ((init_value & 15) << 3) - 16; int init_state = MIN(MAX(1, ((slope * (int)qp) >> 4) + offset), 126); if (init_state >= 64) { ctx->uc_state = ((init_state - 64) << 1) + 1; } else { ctx->uc_state = (63 - init_state) << 1; } } /** * \brief Initialize cabac context to be used for coding * \param encoder encoder control struct * \param slice type of slice we are coding (P/B/I) */ void kvz_init_contexts(encoder_state_t *state, int8_t QP, int8_t slice) { cabac_data_t * const cabac = &state->cabac; uint16_t i; // Initialize contexts kvz_ctx_init(&cabac->ctx.transform_skip_model_luma, QP, INIT_TRANSFORMSKIP_FLAG[slice][0]); kvz_ctx_init(&cabac->ctx.transform_skip_model_chroma, QP, INIT_TRANSFORMSKIP_FLAG[slice][1]); kvz_ctx_init(&cabac->ctx.sao_merge_flag_model, QP, INIT_SAO_MERGE_FLAG[slice]); kvz_ctx_init(&cabac->ctx.sao_type_idx_model, QP, INIT_SAO_TYPE_IDX[slice]); kvz_ctx_init(&cabac->ctx.cu_merge_flag_ext_model, QP, INIT_MERGE_FLAG_EXT[slice][0]); kvz_ctx_init(&cabac->ctx.cu_merge_idx_ext_model, QP, INIT_MERGE_IDX_EXT[slice][0]); kvz_ctx_init(&cabac->ctx.cu_pred_mode_model, QP, INIT_PRED_MODE[slice][0]); kvz_ctx_init(&cabac->ctx.cu_transquant_bypass, QP, INIT_CU_TRANSQUANT_BYPASS[slice][0]); kvz_ctx_init(&cabac->ctx.cu_skip_flag_model[0], QP, INIT_SKIP_FLAG[slice][0]); kvz_ctx_init(&cabac->ctx.cu_skip_flag_model[1], QP, INIT_SKIP_FLAG[slice][1]); kvz_ctx_init(&cabac->ctx.cu_skip_flag_model[2], QP, INIT_SKIP_FLAG[slice][2]); kvz_ctx_init(&cabac->ctx.split_flag_model[0], QP, INIT_SPLIT_FLAG[slice][0]); kvz_ctx_init(&cabac->ctx.split_flag_model[1], QP, INIT_SPLIT_FLAG[slice][1]); kvz_ctx_init(&cabac->ctx.split_flag_model[2], QP, INIT_SPLIT_FLAG[slice][2]); kvz_ctx_init(&cabac->ctx.intra_mode_model, QP, INIT_INTRA_PRED_MODE[slice]); kvz_ctx_init(&cabac->ctx.chroma_pred_model[0], QP, INIT_CHROMA_PRED_MODE[slice][0]); kvz_ctx_init(&cabac->ctx.chroma_pred_model[1], QP, INIT_CHROMA_PRED_MODE[slice][1]); kvz_ctx_init(&cabac->ctx.cu_abs_model_chroma[0], QP, INIT_ABS_FLAG[slice][4]); kvz_ctx_init(&cabac->ctx.cu_abs_model_chroma[1], QP, INIT_ABS_FLAG[slice][5]); //TODO: ignore P/B contexts on intra frame kvz_ctx_init(&cabac->ctx.cu_qt_root_cbf_model, QP, INIT_QT_ROOT_CBF[slice][0]); kvz_ctx_init(&cabac->ctx.cu_mvd_model[0], QP, INIT_MVD[slice][0]); kvz_ctx_init(&cabac->ctx.cu_mvd_model[1], QP, INIT_MVD[slice][1]); kvz_ctx_init(&cabac->ctx.cu_ref_pic_model[0], QP, INIT_REF_PIC[slice][0]); kvz_ctx_init(&cabac->ctx.cu_ref_pic_model[1], QP, INIT_REF_PIC[slice][1]); kvz_ctx_init(&cabac->ctx.mvp_idx_model[0], QP, INIT_MVP_IDX[slice][0]); kvz_ctx_init(&cabac->ctx.mvp_idx_model[1], QP, INIT_MVP_IDX[slice][1]); kvz_ctx_init(&cabac->ctx.cu_qp_delta_abs[0], QP, INIT_CU_QP_DELTA_ABS[slice][0]); kvz_ctx_init(&cabac->ctx.cu_qp_delta_abs[1], QP, INIT_CU_QP_DELTA_ABS[slice][1]); for (i = 0; i < 4; i++) { kvz_ctx_init(&cabac->ctx.cu_sig_coeff_group_model[i], QP, INIT_SIG_CG_FLAG[slice][i]); kvz_ctx_init(&cabac->ctx.cu_abs_model_luma[i], QP, INIT_ABS_FLAG[slice][i]); kvz_ctx_init(&cabac->ctx.part_size_model[i], QP, INIT_PART_SIZE[slice][i]); } for (i = 0; i < 3; i++) { kvz_ctx_init(&cabac->ctx.trans_subdiv_model[i], QP, INIT_TRANS_SUBDIV_FLAG[slice][i]); } for (i = 0; i < 4; i++) { kvz_ctx_init(&cabac->ctx.qt_cbf_model_luma[i], QP, INIT_QT_CBF[slice][i]); kvz_ctx_init(&cabac->ctx.qt_cbf_model_chroma[i], QP, INIT_QT_CBF[slice][i + 4]); } for (i = 0; i < 5; i++) { kvz_ctx_init(&cabac->ctx.inter_dir[i], QP, INIT_INTER_DIR[slice][i]); } for (i = 0; i < 8; i++) { kvz_ctx_init(&cabac->ctx.cu_one_model_chroma[i], QP, INIT_ONE_FLAG[slice][i+16]); } for (i = 0; i < 15; i++) { kvz_ctx_init(&cabac->ctx.cu_ctx_last_y_luma[i], QP, INIT_LAST[slice][i] ); kvz_ctx_init(&cabac->ctx.cu_ctx_last_x_luma[i], QP, INIT_LAST[slice][i] ); kvz_ctx_init(&cabac->ctx.cu_ctx_last_y_chroma[i], QP, INIT_LAST[slice][i+15] ); kvz_ctx_init(&cabac->ctx.cu_ctx_last_x_chroma[i], QP, INIT_LAST[slice][i+15] ); kvz_ctx_init(&cabac->ctx.cu_one_model_luma[i], QP, INIT_ONE_FLAG[slice][i]); } kvz_ctx_init(&cabac->ctx.cu_one_model_luma[15], QP, INIT_ONE_FLAG[slice][15]); for (i = 0; i < 27; i++) { kvz_ctx_init(&cabac->ctx.cu_sig_model_luma[i], QP, INIT_SIG_FLAG[slice][i]); if(i < 15) kvz_ctx_init(&cabac->ctx.cu_sig_model_chroma[i], QP, INIT_SIG_FLAG[slice][i+27]); } } void kvz_context_copy(encoder_state_t * const target_state, const encoder_state_t * const source_state) { cabac_data_t * const target_cabac = &target_state->cabac; const cabac_data_t * const source_cabac = &source_state->cabac; if (target_cabac == source_cabac) return; target_cabac->ctx = source_cabac->ctx; } uint32_t kvz_context_get_sig_coeff_group( uint32_t *sig_coeff_group_flag, uint32_t pos_x, uint32_t pos_y, int32_t width) { uint32_t uiRight = 0; uint32_t uiLower = 0; width >>= 2; if (pos_x < (uint32_t)width - 1) uiRight = (sig_coeff_group_flag[pos_y * width + pos_x + 1] != 0); if (pos_y < (uint32_t)width - 1) uiLower = (sig_coeff_group_flag[(pos_y + 1 ) * width + pos_x] != 0); return uiRight || uiLower; } /** * \brief Pattern decision for context derivation process of significant_coeff_flag * \param sig_coeff_group_flag pointer to prior coded significant coeff group * \param pos_x column of current coefficient group * \param pos_y row of current coefficient group * \param width width of the block * \returns pattern for current coefficient group */ int32_t kvz_context_calc_pattern_sig_ctx(const uint32_t *sig_coeff_group_flag, uint32_t pos_x, uint32_t pos_y, int32_t width) { uint32_t sigRight = 0; uint32_t sigLower = 0; if (width == 4) return -1; width >>= 2; if (pos_x < (uint32_t)width - 1) sigRight = (sig_coeff_group_flag[pos_y * width + pos_x + 1] != 0); if (pos_y < (uint32_t)width - 1) sigLower = (sig_coeff_group_flag[(pos_y + 1 ) * width + pos_x] != 0); return sigRight + (sigLower<<1); } /** * \brief Context derivation process of coeff_abs_significant_flag * \param pattern_sig_ctx pattern for current coefficient group * \param scan_idx pixel scan type in use * \param pos_x column of current scan position * \param pos_y row of current scan position * \param block_type log2 value of block size if square block, or 4 otherwise * \param width width of the block * \param texture_type texture type (TEXT_LUMA...) * \returns ctx_inc for current scan position */ int32_t kvz_context_get_sig_ctx_inc(int32_t pattern_sig_ctx, uint32_t scan_idx, int32_t pos_x, int32_t pos_y, int32_t block_type, int8_t texture_type) { const int32_t ctx_ind_map[16] = { 0, 1, 4, 5, 2, 3, 4, 5, 6, 6, 8, 8, 7, 7, 8, 8 }; int32_t cnt,offset,pos_x_in_subset,pos_y_in_subset; if (pos_x + pos_y == 0) return 0; if (block_type == 2) return ctx_ind_map[4 * pos_y + pos_x]; offset = (block_type == 3) ? ((scan_idx == SCAN_DIAG) ? 9 : 15) : ((texture_type == 0) ? 21 : 12); pos_x_in_subset = pos_x - ((pos_x>>2)<<2); pos_y_in_subset = pos_y - ((pos_y>>2)<<2); if (pattern_sig_ctx == 0) { cnt = (pos_x_in_subset + pos_y_in_subset <= 2) ? ((pos_x_in_subset + pos_y_in_subset==0) ? 2 : 1) : 0; } else if (pattern_sig_ctx==1) { cnt = (pos_y_in_subset <= 1) ? ((pos_y_in_subset == 0) ? 2 : 1) : 0; } else if (pattern_sig_ctx==2) { cnt = (pos_x_in_subset <= 1) ? ((pos_x_in_subset == 0) ? 2 : 1) : 0; } else { cnt = 2; } return (( texture_type == 0 && ((pos_x>>2) + (pos_y>>2)) > 0 ) ? 3 : 0) + offset + cnt; }