/****************************************************************************** * * Copyright (C) 2018 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ***************************************************************************** * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore */ /** ****************************************************************************** * @file ihevce_cabac_rdo.c * * @brief * This file contains function definitions for rdopt cabac entropy modules * * @author * ittiam * * @List of Functions * ihevce_entropy_rdo_frame_init() * ihevce_entropy_rdo_ctb_init() * ihevce_entropy_rdo_encode_cu() * ihevce_cabac_rdo_encode_sao() * ihevce_update_best_sao_cabac_state() * ihevce_entropy_update_best_cu_states() * ihevce_entropy_rdo_encode_tu() * ihevce_entropy_rdo_encode_tu_rdoq() * ihevce_entropy_rdo_copy_states() * ****************************************************************************** */ /*****************************************************************************/ /* File Includes */ /*****************************************************************************/ /* System include files */ #include #include #include #include #include #include /* User include files */ #include "ihevc_typedefs.h" #include "itt_video_api.h" #include "ihevce_api.h" #include "rc_cntrl_param.h" #include "rc_frame_info_collector.h" #include "rc_look_ahead_params.h" #include "ihevc_defs.h" #include "ihevc_structs.h" #include "ihevc_platform_macros.h" #include "ihevc_deblk.h" #include "ihevc_itrans_recon.h" #include "ihevc_chroma_itrans_recon.h" #include "ihevc_chroma_intra_pred.h" #include "ihevc_intra_pred.h" #include "ihevc_inter_pred.h" #include "ihevc_mem_fns.h" #include "ihevc_padding.h" #include "ihevc_weighted_pred.h" #include "ihevc_sao.h" #include "ihevc_resi_trans.h" #include "ihevc_quant_iquant_ssd.h" #include "ihevc_cabac_tables.h" #include "ihevce_defs.h" #include "ihevce_lap_enc_structs.h" #include "ihevce_multi_thrd_structs.h" #include "ihevce_me_common_defs.h" #include "ihevce_had_satd.h" #include "ihevce_error_codes.h" #include "ihevce_bitstream.h" #include "ihevce_cabac.h" #include "ihevce_rdoq_macros.h" #include "ihevce_function_selector.h" #include "ihevce_enc_structs.h" #include "ihevce_entropy_structs.h" #include "ihevce_cmn_utils_instr_set_router.h" #include "ihevce_enc_loop_structs.h" #include "ihevce_cabac_rdo.h" #include "ihevce_trace.h" /*****************************************************************************/ /* Function Definitions */ /*****************************************************************************/ /** ****************************************************************************** * * @brief Cabac rdopt frame level initialization. * * @par Description * Registers the sps,vps,pps,slice header pointers in rdopt enntropy contexts * and intializes cabac engine (init states) for each init cu and scratch cu * contexts * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] ps_slice_hdr * pointer to current slice header * * @param[in] ps_sps * pointer to active SPS params * * @param[in] ps_pps * pointer to active PPS params * * @param[in] ps_vps * pointer to active VPS params * * @param[in] pu1_cu_skip_top_row * pointer to top row cu skip flags (registered at frame level) * * @return none * ****************************************************************************** */ void ihevce_entropy_rdo_frame_init( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, slice_header_t *ps_slice_hdr, pps_t *ps_pps, sps_t *ps_sps, vps_t *ps_vps, UWORD8 *pu1_cu_skip_top_row, rc_quant_t *ps_rc_quant_ctxt) { WORD32 slice_qp = ps_slice_hdr->i1_slice_qp_delta + ps_pps->i1_pic_init_qp; /* Initialize the CTB size from sps parameters */ WORD32 log2_ctb_size = ps_sps->i1_log2_min_coding_block_size + ps_sps->i1_log2_diff_max_min_coding_block_size; WORD32 cabac_init_idc; (void)ps_rc_quant_ctxt; /* sanity checks */ ASSERT((log2_ctb_size >= 3) && (log2_ctb_size <= 6)); ASSERT((slice_qp >= ps_rc_quant_ctxt->i2_min_qp) && (slice_qp <= ps_rc_quant_ctxt->i2_max_qp)); /* register the sps,vps,pps, slice header pts in all cu entropy ctxts */ ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].ps_vps = ps_vps; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].ps_sps = ps_sps; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].ps_pps = ps_pps; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].ps_slice_hdr = ps_slice_hdr; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].ps_vps = ps_vps; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].ps_sps = ps_sps; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].ps_pps = ps_pps; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].ps_slice_hdr = ps_slice_hdr; /* initialze the skip cu top row ptrs for all rdo entropy contexts */ ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].pu1_skip_cu_top = pu1_cu_skip_top_row; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].pu1_skip_cu_top = pu1_cu_skip_top_row; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].i1_log2_ctb_size = log2_ctb_size; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].i1_log2_ctb_size = log2_ctb_size; /* initialze the skip cu left flagd for all rdo entropy contexts */ ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].u4_skip_cu_left = 0; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].u4_skip_cu_left = 0; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].i1_ctb_num_pcm_blks = 0; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].i1_ctb_num_pcm_blks = 0; /* residue encoding should be enaled if ZERO_CBF eval is disabled */ #if((!RDOPT_ZERO_CBF_ENABLE) && (RDOPT_ENABLE)) ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].i4_enable_res_encode = 1; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].i4_enable_res_encode = 1; #else ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].i4_enable_res_encode = 0; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].i4_enable_res_encode = 0; #endif /*************************************************************************/ /* Note pu1_cbf_cb, pu1_cbf_cr initialization are done with array idx 1 */ /* This is because these flags are accessed as pu1_cbf_cb[tfr_depth - 1] */ /* without cheking for tfr_depth= 0 */ /*************************************************************************/ ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].apu1_cbf_cb[0] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].au1_cbf_cb[0][1]; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].apu1_cbf_cb[0] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].au1_cbf_cb[0][1]; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].apu1_cbf_cr[0] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].au1_cbf_cr[0][1]; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].apu1_cbf_cr[0] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].au1_cbf_cr[0][1]; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].apu1_cbf_cb[1] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].au1_cbf_cb[1][1]; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].apu1_cbf_cb[1] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].au1_cbf_cb[1][1]; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].apu1_cbf_cr[1] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].au1_cbf_cr[1][1]; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].apu1_cbf_cr[1] = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].au1_cbf_cr[1][1]; memset( ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].au1_cbf_cb, 0, (MAX_TFR_DEPTH + 1) * 2 * sizeof(UWORD8)); memset( ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].au1_cbf_cb, 0, (MAX_TFR_DEPTH + 1) * 2 * sizeof(UWORD8)); memset( ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].au1_cbf_cr, 0, (MAX_TFR_DEPTH + 1) * 2 * sizeof(UWORD8)); memset( ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].au1_cbf_cr, 0, (MAX_TFR_DEPTH + 1) * 2 * sizeof(UWORD8)); /* initialize the cabac init idc based on slice type */ if(ps_slice_hdr->i1_slice_type == ISLICE) { cabac_init_idc = 0; } else if(ps_slice_hdr->i1_slice_type == PSLICE) { cabac_init_idc = ps_slice_hdr->i1_cabac_init_flag ? 2 : 1; } else { cabac_init_idc = ps_slice_hdr->i1_cabac_init_flag ? 1 : 2; } /* all the entropy contexts in rdo initialized in bit compute mode */ ihevce_cabac_init( &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].s_cabac_ctxt, NULL, /* bitstream buffer not required in bits compute mode */ CLIP3(slice_qp, 0, IHEVC_MAX_QP), cabac_init_idc, CABAC_MODE_COMPUTE_BITS); ihevce_cabac_init( &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].s_cabac_ctxt, NULL, /* bitstream buffer not required in bits compute mode */ CLIP3(slice_qp, 0, IHEVC_MAX_QP), cabac_init_idc, CABAC_MODE_COMPUTE_BITS); /* initialize the entropy states in rdopt struct */ COPY_CABAC_STATES( &ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states[0], &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].s_cabac_ctxt.au1_ctxt_models[0], sizeof(ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states)); } /** ****************************************************************************** * * @brief Cabac rdopt ctb level initialization. * * @par Description * initialzes the ctb x and y co-ordinates for all the rdopt entropy contexts * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] ctb_x * current ctb x offset w.r.t frame start (ctb units) * * @param[in] ctb_y * current ctb y offset w.r.t frame start (ctb units) * * @return none * ****************************************************************************** */ void ihevce_entropy_rdo_ctb_init( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, WORD32 ctb_x, WORD32 ctb_y) { /* initialze the ctb x and y co-ordinates for all the rdopt entropy contexts */ ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].i4_ctb_x = ctb_x; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].i4_ctb_x = ctb_x; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].i4_ctb_y = ctb_y; ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].i4_ctb_y = ctb_y; } /** ****************************************************************************** * * @brief Cabac rdopt cu encode function to compute luma bits for a given cu * only luma bits are used for rd optimization currently * * @par Description * use a scratch CU entropy context (indicated by rdopt_buf_idx) whose cabac * states are reset (to CU init state) and calls the cabac entropy coding * unit function to compute the total bits for current CU * * A local CU structutre is prepared (in stack) as the structures that entropy * encode expects and the rdopt gets are different * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] ps_cu_prms * pointer to current CU params whose bits are computed * * @param[in] cu_pos_x * current CU x position w.r.t ctb (in 8x8 units) * * @param[in] cu_pos_y * current CU y position w.r.t ctb (in 8x8 units) * * @param[in] cu_size * current cu size (in pel units) * * @param[in] top_avail * top avaialability flag for current CU (required for encoding skip flag) * * @param[in] left_avail * left avaialability flag for current CU (required for encoding skip flag) * * @param[in] pv_ecd_coeff * Compressed coeff residue buffer (for luma) * * @param[in] rdopt_buf_idx * corresponds to the id of the scratch CU entropy context that needs to be * used for bit estimation * * @param[out] pi4_cu_rdopt_tex_bits * returns cbf bits if zer0 cbf eval flag is enabled otherwiese returns total * tex(including cbf bits) * * @return total bits required to encode the current CU * ****************************************************************************** */ WORD32 ihevce_entropy_rdo_encode_cu( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, enc_loop_cu_final_prms_t *ps_cu_prms, WORD32 cu_pos_x, WORD32 cu_pos_y, WORD32 cu_size, WORD32 top_avail, WORD32 left_avail, void *pv_ecd_coeff, WORD32 *pi4_cu_rdopt_tex_bits) { /* local cu structure for passing to entrop encode cu module */ cu_enc_loop_out_t s_enc_cu; WORD32 rdopt_buf_idx = ps_rdopt_entropy_ctxt->i4_curr_buf_idx; entropy_context_t *ps_cur_cu_entropy = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[rdopt_buf_idx]; WORD32 total_bits = 0; WORD32 log2_ctb_size = ps_cur_cu_entropy->i1_log2_ctb_size; WORD32 log2_cu_size; WORD32 cu_depth; /* sanity checks */ ASSERT((rdopt_buf_idx == 0) || (rdopt_buf_idx == 1)); ASSERT((cu_size >= 8) && (cu_size <= (1 << log2_ctb_size))); ASSERT((cu_pos_x >= 0) && (cu_pos_x <= (1 << (log2_ctb_size - 3)))); ASSERT((cu_pos_y >= 0) && (cu_pos_y <= (1 << (log2_ctb_size - 3)))); GETRANGE(log2_cu_size, cu_size); log2_cu_size -= 1; cu_depth = log2_ctb_size - log2_cu_size; { /**********************************************************/ /* prepare local cu structure before calling cabac encode */ /**********************************************************/ /* default be canged to have orred val*/ s_enc_cu.b1_no_residual_syntax_flag = 0; /* initialize cu posx, posy and size */ s_enc_cu.b3_cu_pos_x = cu_pos_x; s_enc_cu.b3_cu_pos_y = cu_pos_y; s_enc_cu.b4_cu_size = (cu_size >> 3); /* PCM not supported */ s_enc_cu.b1_pcm_flag = 0; s_enc_cu.b1_pred_mode_flag = ps_cu_prms->u1_intra_flag; s_enc_cu.b3_part_mode = ps_cu_prms->u1_part_mode; s_enc_cu.b1_skip_flag = ps_cu_prms->u1_skip_flag; s_enc_cu.b1_tq_bypass_flag = 0; s_enc_cu.pv_coeff = pv_ecd_coeff; /* store the number of TUs */ s_enc_cu.u2_num_tus_in_cu = ps_cu_prms->u2_num_tus_in_cu; /* ---- intialize the PUs and TUs start ptrs for cur CU ----- */ s_enc_cu.ps_pu = &ps_cu_prms->as_pu_enc_loop[0]; s_enc_cu.ps_enc_tu = &ps_cu_prms->as_tu_enc_loop[0]; /* Corner case : If Part is 2Nx2N and Merge has all TU with zero cbf */ /* then it has to be coded as skip CU */ if((SIZE_2Nx2N == ps_cu_prms->u1_part_mode) && /*(1 == ps_cu_prms->u2_num_tus_in_cu) &&*/ (1 == ps_cu_prms->as_pu_enc_loop[0].b1_merge_flag) && (0 == ps_cu_prms->u1_skip_flag) && (0 == ps_cu_prms->u1_is_cu_coded)) { s_enc_cu.b1_skip_flag = 1; } if(s_enc_cu.b1_pred_mode_flag == PRED_MODE_INTER) { s_enc_cu.b1_no_residual_syntax_flag = !ps_cu_prms->u1_is_cu_coded; } else /* b1_pred_mode_flag == PRED_MODE_INTRA */ { /* copy prev_mode_flag, mpm_idx and rem_intra_pred_mode for each PU */ memcpy( &s_enc_cu.as_prev_rem[0], &ps_cu_prms->as_intra_prev_rem[0], ps_cu_prms->u2_num_tus_in_cu * sizeof(intra_prev_rem_flags_t)); s_enc_cu.b3_chroma_intra_pred_mode = ps_cu_prms->u1_chroma_intra_pred_mode; } } /* reset the total bits in cabac engine to zero */ ps_cur_cu_entropy->s_cabac_ctxt.u4_bits_estimated_q12 = 0; ps_cur_cu_entropy->s_cabac_ctxt.u4_texture_bits_estimated_q12 = 0; ps_cur_cu_entropy->s_cabac_ctxt.u4_cbf_bits_q12 = 0; ps_cur_cu_entropy->i1_encode_qp_delta = 0; /* Call the cabac encode function of current cu to compute bits */ ihevce_cabac_encode_coding_unit(ps_cur_cu_entropy, &s_enc_cu, cu_depth, top_avail, left_avail); /* return total bits after rounding the fractional bits */ total_bits = (ps_cur_cu_entropy->s_cabac_ctxt.u4_bits_estimated_q12 + (1 << (CABAC_FRAC_BITS_Q - 1))) >> CABAC_FRAC_BITS_Q; #if RDOPT_ZERO_CBF_ENABLE ASSERT(ps_cur_cu_entropy->s_cabac_ctxt.u4_texture_bits_estimated_q12 == 0); #endif /* return total texture bits rounding the fractional bits */ *pi4_cu_rdopt_tex_bits = (ps_cur_cu_entropy->s_cabac_ctxt.u4_cbf_bits_q12 + (1 << (CABAC_FRAC_BITS_Q - 1))) >> CABAC_FRAC_BITS_Q; /* ( ps_cur_cu_entropy->s_cabac_ctxt.u4_texture_bits_estimated_q12 + (1 << (CABAC_FRAC_BITS_Q - 1)) ) >> CABAC_FRAC_BITS_Q;*/ return (total_bits); } /** ****************************************************************************** * * @brief Cabac rdo encode sao function to compute bits required for a given * ctb to be encoded with any sao type or no SAO. * * @par Description * use a scratch CU entropy context (indicated by rdopt_buf_idx) and init cabac * states are reset (to CU init state) and calls the cabac encode sao * function to compute the total bits for current CTB * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] ps_ctb_enc_loop_out * pointer to current enc loop CTB output structure * * @return total bits required to encode the current CTB * ****************************************************************************** */ WORD32 ihevce_cabac_rdo_encode_sao( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, ctb_enc_loop_out_t *ps_ctb_enc_loop_out) { /* index to curr buf*/ WORD32 rdopt_buf_idx = ps_rdopt_entropy_ctxt->i4_curr_buf_idx; WORD32 total_bits = 0; entropy_context_t *ps_cur_ctb_entropy = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[rdopt_buf_idx]; /* copy the intial entropy states from backuped buf to curr buf */ memcpy( &ps_cur_ctb_entropy->s_cabac_ctxt.au1_ctxt_models[0], &ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states[0], sizeof(ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states)); /* reset the total bits in cabac engine to zero */ ps_cur_ctb_entropy->s_cabac_ctxt.u4_bits_estimated_q12 = 0; ps_cur_ctb_entropy->s_cabac_ctxt.u4_texture_bits_estimated_q12 = 0; ps_cur_ctb_entropy->s_cabac_ctxt.u4_cbf_bits_q12 = 0; ps_cur_ctb_entropy->i1_encode_qp_delta = 0; //ps_cur_ctb_entropy->s_cabac_ctxt.u4_range = 0; ASSERT(ps_cur_ctb_entropy->s_cabac_ctxt.u4_range == 0); ihevce_cabac_encode_sao(ps_cur_ctb_entropy, ps_ctb_enc_loop_out); /* return total bits after rounding the fractional bits */ total_bits = (ps_cur_ctb_entropy->s_cabac_ctxt.u4_bits_estimated_q12 + (1 << (CABAC_FRAC_BITS_Q - 1))) >> CABAC_FRAC_BITS_Q; return (total_bits); } /** ****************************************************************************** * * @brief Updates best sao cabac state. * * @par Description * Copies the cabac states of best cand to init states buf for next ctb. * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] i4_best_buf_idx * Index to the buffer having the cabac states of best candidate * * @return Success/failure * ****************************************************************************** */ WORD32 ihevce_update_best_sao_cabac_state( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, WORD32 i4_best_buf_idx) { /* local cu structure for passing to entrop encode cu module */ WORD32 rdopt_buf_idx = i4_best_buf_idx; entropy_context_t *ps_cur_ctb_entropy = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[rdopt_buf_idx]; /* copy the intial entropy states from best buf to intial states buf */ memcpy( &ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states[0], &ps_cur_ctb_entropy->s_cabac_ctxt.au1_ctxt_models[0], sizeof(ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states)); /* reset the total bits in cabac engine to zero */ ps_cur_ctb_entropy->s_cabac_ctxt.u4_bits_estimated_q12 = 0; ps_cur_ctb_entropy->s_cabac_ctxt.u4_texture_bits_estimated_q12 = 0; ps_cur_ctb_entropy->s_cabac_ctxt.u4_cbf_bits_q12 = 0; ps_cur_ctb_entropy->i1_encode_qp_delta = 0; return (1); } /** ****************************************************************************** * * @brief Cabac rdopt cu encode function to compute luma bits for a given cu * only luma bits are used for rd optimization currently * * @par Description * use a scratch CU entropy context (indicated by rdopt_buf_idx) whose cabac * states are reset (to CU init state) and calls the cabac entropy coding * unit function to compute the total bits for current CU * * A local CU structutre is prepared (in stack) as the structures that entropy * encode expects and the rdopt gets are different * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] cu_pos_x * current CU x position w.r.t ctb (in 8x8 units) * * @param[in] cu_pos_y * current CU y position w.r.t ctb (in 8x8 units) * * @param[in] cu_size * current cu size (in pel units) * * @param[in] rdopt_best_cu_idx * id of the best CU entropy ctxt (rdopt winner candidate) * * @return total bits required to encode the current CU * ****************************************************************************** */ void ihevce_entropy_update_best_cu_states( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, WORD32 cu_pos_x, WORD32 cu_pos_y, WORD32 cu_size, WORD32 cu_skip_flag, WORD32 rdopt_best_cu_idx) { entropy_context_t *ps_best_cu_entropy = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[rdopt_best_cu_idx]; /* CTB x co-ordinate w.r.t frame start */ WORD32 ctb_x0_frm = (ps_best_cu_entropy->i4_ctb_x << ps_best_cu_entropy->i1_log2_ctb_size); /* CU x co-ordinate w.r.t frame start */ WORD32 cu_x0_frm = cu_pos_x + ctb_x0_frm; /* bit postion from where top skip flag is extracted; 1bit per 8 pel */ WORD32 x_pos = ((cu_x0_frm >> 3) & 0x7); /* bit postion from where left skip flag is extracted; 1bit per 8 pel */ WORD32 y_pos = ((cu_pos_y >> 3) & 0x7); /* top and left skip flags computed based on nbr availability */ UWORD8 *pu1_top_skip_flags = ps_best_cu_entropy->pu1_skip_cu_top + (cu_x0_frm >> 6); UWORD32 u4_skip_left_flags = ps_best_cu_entropy->u4_skip_cu_left; ps_best_cu_entropy = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[rdopt_best_cu_idx]; /* copy the entropy states from best rdopt cu states to init states */ COPY_CABAC_STATES( &ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states[0], &ps_best_cu_entropy->s_cabac_ctxt.au1_ctxt_models[0], sizeof(ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states)); /* replicate skip flag in left and top row cu skip flags */ if(cu_skip_flag) { SET_BITS(pu1_top_skip_flags[0], x_pos, (cu_size >> 3)); SET_BITS(u4_skip_left_flags, y_pos, (cu_size >> 3)); } else { CLEAR_BITS(pu1_top_skip_flags[0], x_pos, (cu_size >> 3)); CLEAR_BITS(u4_skip_left_flags, y_pos, (cu_size >> 3)); } /* copy the left skip flags in both the rdopt contexts */ ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[0].u4_skip_cu_left = ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[1].u4_skip_cu_left = u4_skip_left_flags; } /** ****************************************************************************** * * @brief Cabac rdopt tu encode function to compute luma bits for a given tu * only luma bits are used for rd optimization currently * * @par Description * use a scratch CU entropy context (indicated by rdopt_buf_idx) whose cabac * states are reset (to CU init state for first tu) and calls the cabac residue * coding function to compute the total bits for current TU * * Note : TU includes only residual coding bits and does not include * tu split, cbf and qp delta encoding bits for a TU * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] pv_ecd_coeff * Compressed coeff residue buffer (for luma) * * @param[in] transform_size * current tu size in pel units * * @param[in] is_luma * indicates if it is luma or chrom TU (required for residue encode) * * @return total bits required to encode the current TU * ****************************************************************************** */ WORD32 ihevce_entropy_rdo_encode_tu( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, void *pv_ecd_coeff, WORD32 transform_size, WORD32 is_luma, WORD32 perform_sbh) { WORD32 log2_tfr_size; WORD32 total_bits = 0; WORD32 curr_buf_idx = ps_rdopt_entropy_ctxt->i4_curr_buf_idx; entropy_context_t *ps_cur_tu_entropy; ps_cur_tu_entropy = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[curr_buf_idx]; ASSERT((transform_size >= 4) && (transform_size <= 32)); /* transform size to log2transform size */ GETRANGE(log2_tfr_size, transform_size); log2_tfr_size -= 1; /* reset the total bits in cabac engine to zero */ ps_cur_tu_entropy->s_cabac_ctxt.u4_bits_estimated_q12 = 0; ps_cur_tu_entropy->i1_encode_qp_delta = 0; /* Call the cabac residue encode function to compute TU bits */ ihevce_cabac_residue_encode_rdopt( ps_cur_tu_entropy, pv_ecd_coeff, log2_tfr_size, is_luma, perform_sbh); /* return total bits after rounding the fractional bits */ total_bits = (ps_cur_tu_entropy->s_cabac_ctxt.u4_bits_estimated_q12 + (1 << (CABAC_FRAC_BITS_Q - 1))) >> CABAC_FRAC_BITS_Q; return (total_bits); } /** ****************************************************************************** * * @brief Cabac rdopt tu encode function to compute bits for a given tu. Actual * RDOQ algorithm is performed by the ihevce_cabac_residue_encode_rdoq function * called by this function. * * @par Description * use a scratch CU entropy context (indicated by rdopt_buf_idx) whose cabac * states are reset (to CU init state for first tu) and calls the cabac residue * coding function to compute the total bits for current TU * * Note : TU includes only residual coding bits and does not include * tu split, cbf and qp delta encoding bits for a TU * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] pv_ecd_coeff * Compressed coeff residue buffer * * @param[in] transform_size * current tu size in pel units * * @param[in] first_tu_of_cu * indicates if the tu is the first unit of cu (required for initializing * cabac ctxts) * * @param[in] rdopt_buf_idx * corresponds to the id of the rdopt CU entropy context that needs to be * used for bit estimation * * @param[in] is_luma * indicates if it is luma or chrom TU (required for residue encode) * * @param[in] intra_nxn_mode * indicates if it is luma or chrom TU (required for residue encode) * * @param[inout] ps_rdoq_ctxt * pointer to rdoq context structure * * @param[inout] pi4_coded_tu_dist * Pointer to the variable which will contain the transform domain distortion * of the entire TU, when any of the coeffs in the TU are coded * * @param[inout] pi4_not_coded_tu_dist * Pointer to the variable which will contain the transform domain distortion * of the enture TU, when all the coeffs in the TU are coded * * @return total bits required to encode the current TU * ****************************************************************************** */ WORD32 ihevce_entropy_rdo_encode_tu_rdoq( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, void *pv_ecd_coeff, WORD32 transform_size, WORD32 is_luma, rdoq_sbh_ctxt_t *ps_rdoq_ctxt, LWORD64 *pi8_coded_tu_dist, LWORD64 *pi8_not_coded_tu_dist, WORD32 perform_sbh) { WORD32 log2_tfr_size; WORD32 total_bits = 0; WORD32 curr_buf_idx = ps_rdopt_entropy_ctxt->i4_curr_buf_idx; entropy_context_t *ps_cur_tu_entropy; ps_cur_tu_entropy = &ps_rdopt_entropy_ctxt->as_cu_entropy_ctxt[curr_buf_idx]; ASSERT((transform_size >= 4) && (transform_size <= 32)); /* transform size to log2transform size */ GETRANGE(log2_tfr_size, transform_size); log2_tfr_size -= 1; /* reset the total bits in cabac engine to zero */ ps_cur_tu_entropy->s_cabac_ctxt.u4_bits_estimated_q12 = 0; ps_cur_tu_entropy->i1_encode_qp_delta = 0; /* Call the cabac residue encode function to compute TU bits */ ihevce_cabac_residue_encode_rdoq( ps_cur_tu_entropy, pv_ecd_coeff, log2_tfr_size, is_luma, (void *)ps_rdoq_ctxt, pi8_coded_tu_dist, pi8_not_coded_tu_dist, perform_sbh); /* return total bits after rounding the fractional bits */ total_bits = (ps_cur_tu_entropy->s_cabac_ctxt.u4_bits_estimated_q12 + (1 << (CABAC_FRAC_BITS_Q - 1))) >> CABAC_FRAC_BITS_Q; return (total_bits); } /** ****************************************************************************** * * @brief Cabac rdopt copy functions for copying states (which will be used later) * * @par Description * Does the HEVC style of entropy sync by copying the state to/from rdo context * from/to row level cabac states at start of row/2nd ctb of row * * Caller needs to make sure UPDATE_ENT_SYNC_RDO_STATE is used for first ctb of * every row (leaving first row of slice) and STORE_ENT_SYNC_RDO_STATE is used for * storing the cabac states at the end of 2nd ctb of a row. * * @param[inout] ps_rdopt_entropy_ctxt * pointer to rdopt entropy context (handle) * * @param[in] pu1_entropy_sync_states * pointer to entropy sync cabac states * * @param[in] copy_mode * mode of copying cabac states. Shall be either UPDATE_ENT_SYNC_RDO_STATE and * STORE_ENT_SYNC_RDO_STATE * ****************************************************************************** */ void ihevce_entropy_rdo_copy_states( rdopt_entropy_ctxt_t *ps_rdopt_entropy_ctxt, UWORD8 *pu1_entropy_sync_states, WORD32 copy_mode) { /* sanity checks */ ASSERT((copy_mode == STORE_ENT_SYNC_RDO_STATE) || (copy_mode == UPDATE_ENT_SYNC_RDO_STATE)); if(STORE_ENT_SYNC_RDO_STATE == copy_mode) { COPY_CABAC_STATES( pu1_entropy_sync_states, &ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states[0], IHEVC_CAB_CTXT_END); } else if(UPDATE_ENT_SYNC_RDO_STATE == copy_mode) { COPY_CABAC_STATES( &ps_rdopt_entropy_ctxt->au1_init_cabac_ctxt_states[0], pu1_entropy_sync_states, IHEVC_CAB_CTXT_END); } }