/*

* Copyright(c) 2019 Intel Corporation

* Copyright (c) 2016, 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 https://www.aomedia.org/license/software-license. 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 https://www.aomedia.org/license/patent-license.

*/

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include "enc_handle.h"

#include "entropy_coding.h"

#include "ec_process.h"

#include "enc_dec_results.h"

#include "ec_results.h"

#include "rc_tasks.h"

#include "cabac_context_model.h"

#include "svt_log.h"

#include "common_dsp_rtcd.h"

static void rest_context_dctor(EbPtr p) {

    EbThreadContext*      thread_ctx = (EbThreadContext*)p;

    EntropyCodingContext* obj        = (EntropyCodingContext*)thread_ctx->priv;

    EB_FREE_ARRAY(obj);

}

/******************************************************

 * Enc Dec Context Constructor

 ******************************************************/

EbErrorType svt_aom_entropy_coding_context_ctor(EbThreadContext* thread_ctx, const EbEncHandle* enc_handle_ptr,

                                                int index) {

    EntropyCodingContext* context_ptr;

    EB_CALLOC_ARRAY(context_ptr, 1);

    thread_ctx->priv  = context_ptr;

    thread_ctx->dctor = rest_context_dctor;

    context_ptr->is_16bit = enc_handle_ptr->scs_instance->scs->static_config.encoder_bit_depth > EB_EIGHT_BIT;

    // Zero levels_buf once; the tail (offset >= LEVELS_TAIL_OFFSET) serves as

    // bottom padding for all block sizes via offset-based placement in set_levels.

    memset(context_ptr->levels_buf + LEVELS_TAIL_OFFSET, 0, TX_PAD_2D - LEVELS_TAIL_OFFSET);

    // Input/Output System Resource Manager FIFOs

    context_ptr->enc_dec_input_fifo_ptr = svt_system_resource_get_consumer_fifo(

        enc_handle_ptr->rest_results_resource_ptr, index);

    context_ptr->entropy_coding_output_fifo_ptr = svt_system_resource_get_producer_fifo(

        enc_handle_ptr->entropy_coding_results_resource_ptr, index);

    return EB_ErrorNone;

}

/***********************************************

 * Entropy Coding Reset Neighbor Arrays

 ***********************************************/

static void entropy_coding_reset_neighbor_arrays(PictureControlSet* pcs, uint16_t tile_idx) {

    svt_aom_neighbor_array_unit_reset(pcs->partition_context_na[tile_idx]);

    svt_aom_neighbor_array_unit_reset(pcs->luma_dc_sign_level_coeff_na[tile_idx]);

    svt_aom_neighbor_array_unit_reset(pcs->cb_dc_sign_level_coeff_na[tile_idx]);

    svt_aom_neighbor_array_unit_reset(pcs->cr_dc_sign_level_coeff_na[tile_idx]);

    svt_aom_neighbor_array_unit_reset(pcs->txfm_context_array[tile_idx]);

}

/**************************************************

 * Reset Entropy Coding Picture

 **************************************************/

static void reset_entropy_coding_picture(EntropyCodingContext* ctx, PictureControlSet* pcs, SequenceControlSet* scs) {

    PictureParentControlSet* ppcs     = pcs->ppcs;

    const uint16_t           tile_cnt = ppcs->av1_cm->tiles_info.tile_rows * ppcs->av1_cm->tiles_info.tile_cols;

    ctx->is_16bit                     = scs->static_config.encoder_bit_depth > EB_EIGHT_BIT;

    const FrameHeader* frm_hdr        = &ppcs->frm_hdr;

    // Asuming cb and cr offset to be the same for chroma QP in both slice and pps for lambda computation

    const uint32_t entropy_coding_qp = frm_hdr->quantization_params.base_q_idx;

    for (uint16_t tile_idx = 0; tile_idx < tile_cnt; tile_idx++) {

        ppcs->prev_qindex[tile_idx] = entropy_coding_qp;

    }

    if (frm_hdr->allow_intrabc) {

        assert(frm_hdr->delta_lf_params.delta_lf_present == 0);

    }

    if (frm_hdr->delta_lf_params.delta_lf_present) {

        ppcs->prev_delta_lf_from_base = 0;

        const int frame_lf_count = ppcs->monochrome == 0 ? FRAME_LF_COUNT : FRAME_LF_COUNT - 2;

        for (int lf_id = 0; lf_id < frame_lf_count; ++lf_id) {

            ppcs->prev_delta_lf[lf_id] = 0;

        }

    }

    // pass the ent

    for (uint16_t tile_idx = 0; tile_idx < tile_cnt; tile_idx++) {

        EntropyCoder*        ec                   = pcs->ec_info[tile_idx]->ec;

        OutputBitstreamUnit* output_bitstream_ptr = ec->ec_output_bitstream_ptr;

        //****************************************************************//

        ec->ec_writer.allow_update_cdf = !ppcs->large_scale_tile && !frm_hdr->disable_cdf_update;

        aom_start_encode(&ec->ec_writer, output_bitstream_ptr);

        // ADD Reset here

        const uint8_t primary_ref_frame = frm_hdr->primary_ref_frame;

        if (primary_ref_frame != PRIMARY_REF_NONE) {

            // primary ref stored as REF_FRAME_MINUS1, while get_list_idx/get_ref_frame_idx take arg of ref frame

            // Therefore, add 1 to the primary ref frame (e.g. LAST --> LAST_FRAME)

            const uint8_t      list_idx = get_list_idx(primary_ref_frame + 1);

            const uint8_t      ref_idx  = get_ref_frame_idx(primary_ref_frame + 1);

            EbReferenceObject* ref      = (EbReferenceObject*)pcs->ref_pic_ptr_array[list_idx][ref_idx]->object_ptr;

            svt_memcpy(ec->fc, &ref->frame_context, sizeof(FRAME_CONTEXT));

        } else {

            svt_aom_reset_entropy_coder(scs->enc_ctx, ec, entropy_coding_qp, pcs->slice_type);

        }

        entropy_coding_reset_neighbor_arrays(pcs, tile_idx);

    }

}

/* Entropy Coding */

/*********************************************************************************

 *

 * @brief

 *  The Entropy Coding process is responsible for producing an AV1 conformant bitstream for each

 *frame.

 *

 * @par Description:

 *  The entropy coder is a frame-based process and is based on multi-symbol arithmetic range coding.

 *  It takes as input the coding decisions and information for each block and produces as output the

 *bitstream for each frame.

 *

 * @param[in] Coding Decisions

 *  Coding decisions and information for each block.

 *

 * @param[out] bitstream

 *  Bitstream for each block

 *

 ********************************************************************************/

EbErrorType svt_aom_entropy_coding_kernel_iter(void* context) {

    EntropyCodingContext* context_ptr = (EntropyCodingContext*)context;

    // Input

    EbObjectWrapper* rest_results_wrapper;

    // Output

    EbObjectWrapper* entropy_coding_results_wrapper_ptr;

    // Get Mode Decision Results

    EB_GET_FULL_OBJECT(context_ptr->enc_dec_input_fifo_ptr, &rest_results_wrapper);

    RestResults*        rest_results = (RestResults*)rest_results_wrapper->object_ptr;

    PictureControlSet*  pcs          = (PictureControlSet*)rest_results->pcs_wrapper->object_ptr;

    SequenceControlSet* scs          = pcs->scs;

    // SB Constants

    uint32_t sb_size = scs->sb_size;

    uint8_t          sb_size_log2    = (uint8_t)svt_log2f(sb_size);

    uint32_t         pic_width_in_sb = (pcs->ppcs->aligned_width + sb_size - 1) >> sb_size_log2;

    uint16_t         tile_idx        = rest_results->tile_index;

    Av1Common* const cm              = pcs->ppcs->av1_cm;

    const uint16_t   tile_cnt        = cm->tiles_info.tile_rows * cm->tiles_info.tile_cols;

    const uint16_t   tile_col        = tile_idx % cm->tiles_info.tile_cols;

    const uint16_t   tile_row        = tile_idx / cm->tiles_info.tile_cols;

    const uint16_t   tile_sb_start_x = cm->tiles_info.tile_col_start_mi[tile_col] >> scs->seq_header.sb_size_log2;

    const uint16_t   tile_sb_start_y = cm->tiles_info.tile_row_start_mi[tile_row] >> scs->seq_header.sb_size_log2;

    uint16_t tile_width_in_sb = (cm->tiles_info.tile_col_start_mi[tile_col + 1] -

                                 cm->tiles_info.tile_col_start_mi[tile_col]) >>

        scs->seq_header.sb_size_log2;

    uint16_t tile_height_in_sb = (cm->tiles_info.tile_row_start_mi[tile_row + 1] -

                                  cm->tiles_info.tile_row_start_mi[tile_row]) >>

        scs->seq_header.sb_size_log2;

    bool frame_entropy_done = false;

    svt_block_on_mutex(pcs->entropy_coding_pic_mutex);

    if (pcs->entropy_coding_pic_reset_flag) {

        pcs->entropy_coding_pic_reset_flag = false;

        reset_entropy_coding_picture(context_ptr, pcs, scs);

    }

    svt_release_mutex(pcs->entropy_coding_pic_mutex);

    if (!svt_aom_is_pic_skipped(pcs->ppcs)) {

        context_ptr->tot_qindex = 0;

        context_ptr->valid_area = 0;

        for (uint32_t y_sb_index = 0; y_sb_index < tile_height_in_sb; ++y_sb_index) {

            for (uint32_t x_sb_index = 0; x_sb_index < tile_width_in_sb; ++x_sb_index) {

                uint16_t    sb_index = (uint16_t)((x_sb_index + tile_sb_start_x) +

                                               (y_sb_index + tile_sb_start_y) * pic_width_in_sb);

                SuperBlock* sb_ptr   = pcs->sb_ptr_array[sb_index];

                const uint32_t sb_origin_x = (x_sb_index + tile_sb_start_x) << sb_size_log2;

                const uint32_t sb_origin_y = (y_sb_index + tile_sb_start_y) << sb_size_log2;

                if (x_sb_index == 0 && y_sb_index == 0) {

                    svt_av1_reset_loop_restoration(context_ptr);

                    context_ptr->tok = pcs->tile_tok[tile_row][tile_col];

                }

                EbPictureBufferDesc* coeff_picture_ptr = pcs->ppcs->enc_dec_ptr->quantized_coeff[sb_index];

                context_ptr->coded_area_sb             = 0;

                context_ptr->coded_area_sb_uv          = 0;

                // Ensure EC buffer has room for worst-case SB output (4 bytes/pixel)

                EbErrorType ret = svt_aom_ec_ensure_capacity(&pcs->ec_info[tile_idx]->ec->ec_writer,

                                                             sb_size * sb_size * 4);

                if (ret != EB_ErrorNone) {

                    return ret;

                }

                svt_aom_write_modes_sb(context_ptr,

                                       sb_ptr,

                                       pcs,

                                       tile_idx,

                                       pcs->ec_info[tile_idx]->ec,

                                       coeff_picture_ptr,

                                       sb_ptr->ptree,

                                       sb_origin_y >> MI_SIZE_LOG2,

                                       sb_origin_x >> MI_SIZE_LOG2);

            }

        }

    }

    bool pic_ready = true;

    // Current tile ready

    svt_aom_encode_slice_finish(pcs->ec_info[tile_idx]->ec);

    svt_block_on_mutex(pcs->entropy_coding_pic_mutex);

    // Flush locally-accumulated qindex stats (avoids per-block mutex)

    pcs->ppcs->tot_qindex += context_ptr->tot_qindex;

    pcs->ppcs->valid_qindex_area += context_ptr->valid_area;

    pcs->ec_info[tile_idx]->entropy_coding_tile_done = true;

    for (uint16_t i = 0; i < tile_cnt; i++) {

        if (pcs->ec_info[i]->entropy_coding_tile_done == false) {

            pic_ready = false;

            break;

        }

    }

    svt_release_mutex(pcs->entropy_coding_pic_mutex);

    if (pic_ready) {

        if (pcs->ppcs->superres_total_recode_loop == 0) {

            // Release the reference Pictures from both lists

            for (REF_FRAME_MINUS1 ref = LAST; ref < ALT + 1; ref++) {

                const uint8_t list_idx = get_list_idx(ref + 1);

                const uint8_t ref_idx  = get_ref_frame_idx(ref + 1);

                if (pcs->ref_pic_ptr_array[list_idx][ref_idx] != NULL) {

                    svt_release_object(pcs->ref_pic_ptr_array[list_idx][ref_idx]);

                }

            }

            //free palette data

            if (pcs->tile_tok[0][0]) {

                EB_FREE_ARRAY(pcs->tile_tok[0][0]);

            }

        }

        frame_entropy_done = true;

    }

    if (frame_entropy_done) {

        if (pcs->ppcs->valid_qindex_area) {

            pcs->ppcs->avg_qp = ((pcs->ppcs->tot_qindex / pcs->ppcs->valid_qindex_area) + 2) >> 2;

        }

        // Get Empty Entropy Coding Results

        svt_get_empty_object(context_ptr->entropy_coding_output_fifo_ptr, &entropy_coding_results_wrapper_ptr);

        EntropyCodingResults* entropy_coding_results_ptr = (EntropyCodingResults*)

                                                               entropy_coding_results_wrapper_ptr->object_ptr;

        entropy_coding_results_ptr->pcs_wrapper = rest_results->pcs_wrapper;

        // Post EntropyCoding Results

        svt_post_full_object(entropy_coding_results_wrapper_ptr);

    }

    // Release Mode Decision Results

    svt_release_object(rest_results_wrapper);

    return EB_ErrorNone;

}

void* svt_aom_entropy_coding_kernel(void* input_ptr) {

    EbThreadContext* thread_ctx = (EbThreadContext*)input_ptr;

    for (;;) {

        EbErrorType err = svt_aom_entropy_coding_kernel_iter(thread_ctx->priv);

        if (err == EB_NoErrorFifoShutdown) {

            return NULL;

        }

    }

    return NULL;

}