/*
 * Copyright (c) 2021, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 3-Clause Clear License
 * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear
 * License was not distributed with this source code in the LICENSE file, you
 * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/.  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
 * aomedia.org/license/patent-license/.
 */

#include <assert.h>
#include <limits.h>
#include <stdio.h>

#include "config/av2_rtcd.h"
#include "config/avm_dsp_rtcd.h"
#include "config/avm_scale_rtcd.h"

#include "avm_dsp/avm_dsp_common.h"
#include "avm_mem/avm_mem.h"
#include "avm_ports/system_state.h"
#include "avm_ports/avm_once.h"
#include "avm_ports/avm_timer.h"
#include "avm_scale/avm_scale.h"
#include "avm_util/avm_thread.h"
#if CONFIG_MISMATCH_DEBUG
#include "avm_util/debug_util.h"
#endif  // CONFIG_MISMATCH_DEBUG

#include "av2/common/alloccommon.h"
#include "av2/common/av2_common_int.h"
#include "av2/common/av2_loopfilter.h"
#include "av2/common/bru.h"
#include "av2/common/pred_common.h"
#include "av2/common/quant_common.h"
#include "av2/common/reconinter.h"
#include "av2/common/reconintra.h"

#include "av2/decoder/decodeframe.h"
#include "av2/decoder/decoder.h"
#include "av2/decoder/detokenize.h"
#include "av2/decoder/obu.h"

#if CONFIG_PARAKIT_COLLECT_DATA
#include "av2/common/entropy_sideinfo.h"
int beginningFrameFlag[MAX_NUMBER_CONTEXTS][MAX_DIMS_CONTEXT3]
                      [MAX_DIMS_CONTEXT2][MAX_DIMS_CONTEXT1][MAX_DIMS_CONTEXT0];
#endif

static void initialize_dec(void) {
  av2_rtcd();
  avm_dsp_rtcd();
  avm_scale_rtcd();
  av2_init_intra_predictors();
  av2_init_stxfm_kernels();
}

static void update_subgop_stats(const AV2_COMMON *const cm,
                                SubGOPStatsDec *const subgop_stats,
                                unsigned int display_order_hint,
                                unsigned int enable_subgop_stats) {
  if (!enable_subgop_stats) return;
  // Update subgop related frame data.
  subgop_stats->disp_frame_idx[subgop_stats->stat_count] = display_order_hint;
  subgop_stats->show_existing_frame[subgop_stats->stat_count] =
      cm->show_existing_frame;
  subgop_stats->immediate_output_picture[subgop_stats->stat_count] =
      cm->immediate_output_picture;
  subgop_stats->qindex[subgop_stats->stat_count] = cm->quant_params.base_qindex;
  subgop_stats->refresh_frame_flags[subgop_stats->stat_count] =
      cm->current_frame.refresh_frame_flags;
  for (MV_REFERENCE_FRAME ref_frame = 0; ref_frame < cm->seq_params.ref_frames;
       ++ref_frame)
    if (cm->ref_frame_map[ref_frame] != NULL) {
      subgop_stats->ref_frame_map[subgop_stats->stat_count][ref_frame] =
          cm->ref_frame_map[ref_frame]->order_hint;
    } else {
      subgop_stats->ref_frame_map[subgop_stats->stat_count][ref_frame] = 0;
    }

  assert(subgop_stats->stat_count < MAX_SUBGOP_STATS_SIZE);
  subgop_stats->stat_count++;
}

static void dec_set_mb_mi(CommonModeInfoParams *mi_params, int width,
                          int height) {
  // Ensure that the decoded width and height are both multiples of
  // 8 luma pixels (note: this may only be a multiple of 4 chroma pixels if
  // subsampling is used).
  // This simplifies the implementation of various experiments,
  // eg. cdef, which operates on units of 8x8 luma pixels.
  const int aligned_width = ALIGN_POWER_OF_TWO(width, 3);
  const int aligned_height = ALIGN_POWER_OF_TWO(height, 3);

  mi_params->mi_cols = aligned_width >> MI_SIZE_LOG2;
  mi_params->mi_rows = aligned_height >> MI_SIZE_LOG2;
  mi_params->mi_stride = calc_mi_size(mi_params->mi_cols);

  mi_params->mb_cols = (mi_params->mi_cols + 2) >> 2;
  mi_params->mb_rows = (mi_params->mi_rows + 2) >> 2;
  mi_params->MBs = mi_params->mb_rows * mi_params->mb_cols;

  mi_params->mi_alloc_bsize = BLOCK_4X4;
  mi_params->mi_alloc_stride = mi_params->mi_stride;

  assert(mi_size_wide[mi_params->mi_alloc_bsize] ==
         mi_size_high[mi_params->mi_alloc_bsize]);
}

static void dec_setup_mi(CommonModeInfoParams *mi_params) {
  const int mi_grid_size =
      mi_params->mi_stride * calc_mi_size(mi_params->mi_rows);
  memset(mi_params->mi_grid_base, 0,
         mi_grid_size * sizeof(*mi_params->mi_grid_base));
  memset(mi_params->submi_grid_base, 0,
         mi_grid_size * sizeof(*mi_params->submi_grid_base));
  memset(mi_params->cctx_type_map, 0,
         mi_grid_size * sizeof(*mi_params->cctx_type_map));
  av2_reset_txk_skip_array_using_mi_params(mi_params);
}

static void dec_free_mi(CommonModeInfoParams *mi_params) {
  avm_free(mi_params->mi_alloc);
  mi_params->mi_alloc = NULL;
  avm_free(mi_params->mi_grid_base);
  mi_params->mi_grid_base = NULL;
  avm_free(mi_params->mi_alloc_sub);
  mi_params->mi_alloc_sub = NULL;
  avm_free(mi_params->submi_grid_base);
  mi_params->submi_grid_base = NULL;
  mi_params->mi_alloc_size = 0;
  avm_free(mi_params->tx_type_map);
  mi_params->tx_type_map = NULL;
  avm_free(mi_params->cctx_type_map);
  mi_params->cctx_type_map = NULL;
  av2_dealloc_class_id_array(mi_params);
  av2_dealloc_txk_skip_array(mi_params);
}

static INLINE void dec_init_tip_ref_frame(AV2_COMMON *const cm) {
  TIP *tip_ref = &cm->tip_ref;
  tip_ref->tip_frame = avm_calloc(1, sizeof(*tip_ref->tip_frame));
  tip_ref->tmp_tip_frame = avm_calloc(1, sizeof(*tip_ref->tmp_tip_frame));
}

static INLINE void dec_free_tip_ref_frame(AV2_COMMON *const cm) {
  avm_free_frame_buffer(&cm->tip_ref.tip_frame->buf);
  avm_free(cm->tip_ref.tip_frame);
  cm->tip_ref.tip_frame = NULL;

  avm_free_frame_buffer(&cm->tip_ref.tmp_tip_frame->buf);
  avm_free(cm->tip_ref.tmp_tip_frame);
  cm->tip_ref.tmp_tip_frame = NULL;
}

#if CONFIG_PARAKIT_COLLECT_DATA
AV2Decoder *av2_decoder_create(BufferPool *const pool, const char *path,
                               const char *suffix) {
#else
AV2Decoder *av2_decoder_create(BufferPool *const pool) {
#endif
  AV2Decoder *volatile const pbi = avm_memalign(32, sizeof(*pbi));
  if (!pbi) return NULL;
  av2_zero(*pbi);

  AV2_COMMON *volatile const cm = &pbi->common;

  // The jmp_buf is valid only for the duration of the function that calls
  // setjmp(). Therefore, this function must reset the 'setjmp' field to 0
  // before it returns.
  if (setjmp(cm->error.jmp)) {
    cm->error.setjmp = 0;
    av2_decoder_remove(pbi);
    return NULL;
  }

  cm->error.setjmp = 1;

  CHECK_MEM_ERROR(cm, cm->fc,
                  (FRAME_CONTEXT *)avm_memalign(32, sizeof(*cm->fc)));
  CHECK_MEM_ERROR(
      cm, cm->default_frame_context,
      (FRAME_CONTEXT *)avm_memalign(32, sizeof(*cm->default_frame_context)));
  memset(cm->fc, 0, sizeof(*cm->fc));
  memset(cm->default_frame_context, 0, sizeof(*cm->default_frame_context));

  pbi->need_resync = 1;
  avm_once(initialize_dec);

  // Initialize the references to not point to any frame buffers.
  for (int i = 0; i < NELEMENTS(cm->ref_frame_map); i++) {
    cm->ref_frame_map[i] = NULL;
  }

  cm->current_frame.frame_number = 0;
  pbi->decoding_first_frame = 1;
  pbi->common.buffer_pool = pool;

  cm->seq_params.bit_depth = AVM_BITS_8;
  cm->mi_params.free_mi = dec_free_mi;
  cm->mi_params.setup_mi = dec_setup_mi;
  cm->mi_params.set_mb_mi = dec_set_mb_mi;

  cm->frame_filter_dictionary_stride = 0;
  cm->frame_filter_dictionary = NULL;
  cm->translated_pcwiener_filters = NULL;
  cm->num_ref_filters = NULL;

  av2_loop_filter_init(cm);
  for (int i = 0; i < NUM_CUSTOM_QMS; ++i) {
    pbi->qm_protected[i] = 0;
  }
  for (int i = 0; i < NUM_CUSTOM_QMS; ++i) pbi->qm_from_leading[i] = 0;
  for (int i = 0; i < MAX_FGM_NUM; ++i) pbi->fgm_from_leading[i] = 0;

  for (int i = 0; i < NUM_CUSTOM_QMS; ++i) {
    pbi->qm_list[i].qm_id = -1;
    pbi->qm_list[i].qm_tlayer_id = -1;
    pbi->qm_list[i].qm_mlayer_id = -1;
    pbi->qm_list[i].quantizer_matrix = NULL;
    pbi->qm_list[i].quantizer_matrix_allocated = false;
    pbi->qm_list[i].quantizer_matrix_num_planes = -1;
  }
  for (int i = 0; i < MAX_FGM_NUM; ++i) {
    pbi->fgm_list[i].fgm_id = -1;
    pbi->fgm_list[i].fgm_tlayer_id = -1;
    pbi->fgm_list[i].fgm_mlayer_id = -1;
  }

  memset(&pbi->last_frame_unit, -1, sizeof(pbi->last_frame_unit));
  memset(&pbi->last_displayable_frame_unit, -1,
         sizeof(pbi->last_displayable_frame_unit));
  pbi->this_is_first_keyframe_unit_in_tu = 0;
  pbi->this_is_first_vcl_obu_in_tu = 0;
  for (int i = 0; i < MAX_NUM_MLAYERS; i++) {
    pbi->num_displayable_frame_unit[i] = 0;
  }
  for (int j = 0; j < MAX_NUM_TLAYERS; j++)
    for (int i = 0; i < MAX_NUM_MLAYERS; i++)
      memset(pbi->obus_in_frame_unit_data[j][i], 0,
             sizeof(pbi->obus_in_frame_unit_data[j][i]));

  for (int xlayer = 0; xlayer < MAX_NUM_XLAYERS; xlayer++)
    for (int i = 0; i < MAX_SEQ_NUM; i++)
      pbi->seq_list[xlayer][i].seq_header_id = -1;

#if CONFIG_ACCOUNTING
  pbi->acct_enabled = 1;
  avm_accounting_init(&pbi->accounting);
#endif

  dec_init_tip_ref_frame(cm);

  cm->error.setjmp = 0;

  avm_get_worker_interface()->init(&pbi->lf_worker);
  pbi->lf_worker.thread_name = "avm lf worker";

  // Initialize the Content Interpretation parameters
  for (int i = 0; i < MAX_NUM_MLAYERS; i++) {
    av2_initialize_ci_params(&cm->ci_params_per_layer[i]);
  }

#if CONFIG_PARAKIT_COLLECT_DATA
#include "av2/common/entropy_inits_coeffs.h"
#include "av2/common/entropy_inits_modes.h"
#include "av2/common/entropy_inits_mv.h"

  // @ParaKit: add side information needed in array of prob_models structure to
  // be used in collecting data
  cm->prob_models[EOB_FLAG_CDF16] =
      (ProbModelInfo){ .ctx_group_name = "eob_flag_cdf16",
                       .prob = (avm_cdf_prob *)av2_default_eob_multi16_cdfs,
                       .cdf_stride = 0,
                       .num_symb = 5,
                       .num_dim = 2,
                       .num_idx = { 0, 0, 4, 3 } };
  cm->prob_models[EOB_FLAG_CDF32] =
      (ProbModelInfo){ .ctx_group_name = "eob_flag_cdf32",
                       .prob = (avm_cdf_prob *)av2_default_eob_multi32_cdfs,
                       .cdf_stride = 0,
                       .num_symb = 6,
                       .num_dim = 2,
                       .num_idx = { 0, 0, 4, 3 } };

  for (int i = 0; i < MAX_NUM_CTX_GROUPS; i++) {
    for (int j = 0; j < MAX_DIMS_CONTEXT3; j++)
      for (int k = 0; k < MAX_DIMS_CONTEXT2; k++)
        for (int l = 0; l < MAX_DIMS_CONTEXT1; l++)
          for (int h = 0; h < MAX_DIMS_CONTEXT0; h++)
            beginningFrameFlag[i][j][k][l][h] = 0;
  }

  for (int f = 0; f < MAX_NUM_CTX_GROUPS; f++) {
    cm->prob_models[f].model_idx = f;
    const int fixed_stride = cm->prob_models[f].cdf_stride;
    const int num_sym = cm->prob_models[f].num_symb;
    const int num_dims = cm->prob_models[f].num_dim;
    const int num_idx0 = cm->prob_models[f].num_idx[0];
    const int num_idx1 = cm->prob_models[f].num_idx[1];
    const int num_idx2 = cm->prob_models[f].num_idx[2];
    const int num_idx3 = cm->prob_models[f].num_idx[3];
    const char *str_ctx = cm->prob_models[f].ctx_group_name;
    const char *str_path = path ? path : ".";
    const char *str_suffix = suffix ? suffix : "data";
    char filename[2048];
    sprintf(filename, "%s/Stat_%s_%s.csv", str_path, str_ctx, str_suffix);
    FILE *fData = fopen(filename, "wt");
    cm->prob_models[f].fDataCollect = fData;

    fprintf(fData, "Header:%s,%d,%d", str_ctx, num_sym, num_dims);
    const int dim_offset = MAX_CTX_DIM - num_dims;
    for (int i = 0; i < num_dims; i++) {
      fprintf(fData, ",%d", cm->prob_models[f].num_idx[i + dim_offset]);
    }
    fprintf(fData, "\n");

    avm_cdf_prob *prob_ptr;
    prob_ptr = cm->prob_models[f].prob;
    int ctx_group_counter = 0;
    for (int d0 = 0; d0 < (num_idx0 == 0 ? 1 : num_idx0); d0++)
      for (int d1 = 0; d1 < (num_idx1 == 0 ? 1 : num_idx1); d1++)
        for (int d2 = 0; d2 < (num_idx2 == 0 ? 1 : num_idx2); d2++)
          for (int d3 = 0; d3 < (num_idx3 == 0 ? 1 : num_idx3); d3++) {
            // indexing according to MAX_CTX_DIM
            fprintf(fData, "%d,%d,%d,%d,%d,", ctx_group_counter, d0, d1, d2,
                    d3);
            ctx_group_counter++;
            for (int sym = 0; sym < CDF_SIZE(num_sym); sym++) {
              int cdf_stride = (fixed_stride == 0) ? num_sym : fixed_stride;
              int offset =
                  (d0 * num_idx3 * num_idx2 * num_idx1 * CDF_SIZE(cdf_stride)) +
                  (d1 * num_idx3 * num_idx2 * CDF_SIZE(cdf_stride)) +
                  (d2 * num_idx3 * CDF_SIZE(cdf_stride)) +
                  (d3 * CDF_SIZE(cdf_stride)) + sym;
              if (sym < num_sym)
                fprintf(fData, "%d", (int)AVM_ICDF(*(prob_ptr + offset)));
              else
                fprintf(fData, "%d", (int)*(prob_ptr + offset));
              if (sym < CDF_SIZE(num_sym - 1)) {
                fprintf(fData, ",");
              } else {
                fprintf(fData, "\n");
              }
            }
          }
    // main header
    for (int i = 0; i < num_dims; i++) {
      fprintf(fData, "Dim%d,", i);
    }

    fprintf(fData, "FrameNum,FrameType,isBeginFrame,Counter,Value,Cost");

    for (int sym = 0; sym < num_sym; sym++) {
      fprintf(fData, ",cdf%d", sym);
    }
    fprintf(fData, ",rate");
    fprintf(fData, "\n");
  }
#endif
  return pbi;
}

void av2_dealloc_dec_jobs(struct AV2DecTileMTData *tile_mt_info) {
  if (tile_mt_info != NULL) {
#if CONFIG_MULTITHREAD
    if (tile_mt_info->job_mutex != NULL) {
      pthread_mutex_destroy(tile_mt_info->job_mutex);
      avm_free(tile_mt_info->job_mutex);
    }
#endif
    avm_free(tile_mt_info->job_queue);
    // clear the structure as the source of this call may be a resize in which
    // case this call will be followed by an _alloc() which may fail.
    av2_zero(*tile_mt_info);
  }
}

void av2_dec_free_cb_buf(AV2Decoder *pbi) {
  avm_free(pbi->cb_buffer_base);
  pbi->cb_buffer_base = NULL;
  pbi->cb_buffer_alloc_size = 0;
}

void av2_decoder_remove(AV2Decoder *pbi) {
  int i;

  if (!pbi) return;

  avm_get_worker_interface()->end(&pbi->lf_worker);
  avm_free(pbi->lf_worker.data1);

  if (pbi->thread_data) {
    for (int worker_idx = 0; worker_idx < pbi->max_threads - 1; worker_idx++) {
      DecWorkerData *const thread_data = pbi->thread_data + worker_idx;
      av2_free_mc_tmp_buf(thread_data->td);
      av2_free_opfl_tmp_bufs(thread_data->td);
      avm_free(thread_data->td);
    }
    avm_free(pbi->thread_data);
  }

  for (i = 0; i < pbi->num_workers; ++i) {
    AVxWorker *const worker = &pbi->tile_workers[i];
    avm_get_worker_interface()->end(worker);
  }
#if CONFIG_MULTITHREAD
  if (pbi->row_mt_mutex_ != NULL) {
    pthread_mutex_destroy(pbi->row_mt_mutex_);
    avm_free(pbi->row_mt_mutex_);
  }
  if (pbi->row_mt_cond_ != NULL) {
    pthread_cond_destroy(pbi->row_mt_cond_);
    avm_free(pbi->row_mt_cond_);
  }
#endif
  for (i = 0; i < pbi->allocated_tiles; i++) {
    TileDataDec *const tile_data = pbi->tile_data + i;
    av2_dec_row_mt_dealloc(&tile_data->dec_row_mt_sync);
  }
  avm_free(pbi->tile_data);
  avm_free(pbi->tile_workers);

  if (pbi->num_workers > 0) {
    av2_loop_filter_dealloc(&pbi->lf_row_sync);
    av2_ccso_filter_dealloc(&pbi->ccso_sync);
    av2_loop_restoration_dealloc(&pbi->lr_row_sync, pbi->num_workers);
    av2_dealloc_dec_jobs(&pbi->tile_mt_info);
    avm_free(pbi->tip_worker_data);
    av2_tip_dealloc(&pbi->tip_sync);
  }

  dec_free_tip_ref_frame(&pbi->common);

  free_bru_info(&pbi->common);
  av2_dec_free_cb_buf(pbi);
#if CONFIG_ACCOUNTING
  avm_accounting_clear(&pbi->accounting);
#endif
  av2_free_mc_tmp_buf(&pbi->td);
  av2_free_opfl_tmp_bufs(&pbi->td);
  avm_img_metadata_array_free(pbi->metadata);

#if CONFIG_PARAKIT_COLLECT_DATA
  for (int f = 0; f < MAX_NUM_CTX_GROUPS; f++) {
    if (pbi->common.prob_models[f].fDataCollect != NULL) {
      fclose(pbi->common.prob_models[f].fDataCollect);
    }
  }
#endif
  for (int qm_pos = 0; qm_pos < NUM_CUSTOM_QMS; qm_pos++) {
    if (pbi->qm_list[qm_pos].quantizer_matrix != NULL)
      av2_free_qmset(pbi->qm_list[qm_pos].quantizer_matrix);
  }

  if (pbi->multi_stream_mode) {
    // Release intermediate buffers to store internal variables per sub-stream
    if (pbi->stream_info != NULL) {
      avm_free(pbi->stream_info);
      pbi->stream_info = NULL;
    }
  }

  avm_free(pbi);
}

void av2_visit_palette(AV2Decoder *const pbi, MACROBLOCKD *const xd,
                       avm_reader *r, palette_visitor_fn_t visit) {
  if (!is_inter_block(xd->mi[0], xd->tree_type)) {
    const int plane_start = get_partition_plane_start(xd->tree_type);
    const int plane_end = get_partition_plane_end(
        xd->tree_type, AVMMIN(2, av2_num_planes(&pbi->common)));
    for (int plane = plane_start; plane < plane_end; ++plane) {
      if (plane == 0 || xd->is_chroma_ref) {
        if (xd->mi[0]->palette_mode_info.palette_size[plane])
          visit(xd, plane, r);
      } else {
        assert(xd->mi[0]->palette_mode_info.palette_size[plane] == 0);
      }
    }
  }
}

static int equal_dimensions(const YV12_BUFFER_CONFIG *a,
                            const YV12_BUFFER_CONFIG *b) {
  return a->y_height == b->y_height && a->y_width == b->y_width &&
         a->uv_height == b->uv_height && a->uv_width == b->uv_width;
}

avm_codec_err_t av2_copy_reference_dec(AV2Decoder *pbi, int idx,
                                       YV12_BUFFER_CONFIG *sd) {
  AV2_COMMON *cm = &pbi->common;
  const int num_planes = av2_num_planes(cm);

  const YV12_BUFFER_CONFIG *const cfg = get_ref_frame(cm, idx);
  if (cfg == NULL) {
    avm_internal_error(&cm->error, AVM_CODEC_ERROR, "No reference frame");
    return AVM_CODEC_ERROR;
  }
  if (!equal_dimensions(cfg, sd))
    avm_internal_error(&cm->error, AVM_CODEC_ERROR,
                       "Incorrect buffer dimensions");
  else
    avm_yv12_copy_frame(cfg, sd, num_planes);

  return cm->error.error_code;
}

static int equal_dimensions_and_border(const YV12_BUFFER_CONFIG *a,
                                       const YV12_BUFFER_CONFIG *b) {
  return a->y_height == b->y_height && a->y_width == b->y_width &&
         a->uv_height == b->uv_height && a->uv_width == b->uv_width &&
         a->y_stride == b->y_stride && a->uv_stride == b->uv_stride &&
         a->border == b->border;
}

avm_codec_err_t av2_set_reference_dec(AV2_COMMON *cm, int idx,
                                      int use_external_ref,
                                      YV12_BUFFER_CONFIG *sd) {
  const int num_planes = av2_num_planes(cm);
  YV12_BUFFER_CONFIG *ref_buf = NULL;

  // Get the destination reference buffer.
  ref_buf = get_ref_frame(cm, idx);

  if (ref_buf == NULL) {
    avm_internal_error(&cm->error, AVM_CODEC_ERROR, "No reference frame");
    return AVM_CODEC_ERROR;
  }

  if (!use_external_ref) {
    if (!equal_dimensions(ref_buf, sd)) {
      avm_internal_error(&cm->error, AVM_CODEC_ERROR,
                         "Incorrect buffer dimensions");
    } else {
      // Overwrite the reference frame buffer.
      avm_yv12_copy_frame(sd, ref_buf, num_planes);
    }
  } else {
    if (!equal_dimensions_and_border(ref_buf, sd)) {
      avm_internal_error(&cm->error, AVM_CODEC_ERROR,
                         "Incorrect buffer dimensions");
    } else {
      // Overwrite the reference frame buffer pointers.
      // Once we no longer need the external reference buffer, these pointers
      // are restored.
      ref_buf->store_buf_adr[0] = ref_buf->y_buffer;
      ref_buf->store_buf_adr[1] = ref_buf->u_buffer;
      ref_buf->store_buf_adr[2] = ref_buf->v_buffer;
      ref_buf->y_buffer = sd->y_buffer;
      ref_buf->u_buffer = sd->u_buffer;
      ref_buf->v_buffer = sd->v_buffer;
      ref_buf->use_external_reference_buffers = 1;
    }
  }

  return cm->error.error_code;
}

avm_codec_err_t av2_copy_new_frame_dec(AV2_COMMON *cm,
                                       YV12_BUFFER_CONFIG *new_frame,
                                       YV12_BUFFER_CONFIG *sd) {
  const int num_planes = av2_num_planes(cm);

  if (!equal_dimensions_and_border(new_frame, sd))
    avm_internal_error(&cm->error, AVM_CODEC_ERROR,
                       "Incorrect buffer dimensions");
  else
    avm_yv12_copy_frame(new_frame, sd, num_planes);

  return cm->error.error_code;
}

static void release_current_frame(AV2Decoder *pbi) {
  AV2_COMMON *const cm = &pbi->common;
  BufferPool *const pool = cm->buffer_pool;

  cm->cur_frame->buf.corrupted = 1;
  lock_buffer_pool(pool);
  decrease_ref_count(cm->cur_frame, pool);
  unlock_buffer_pool(pool);
  cm->cur_frame = NULL;
}

// This function flushes out the DPB, all the slots in the dpb is free to use.
avm_codec_err_t flush_remaining_frames(struct AV2Decoder *pbi,
                                       int order_hint_limit) {
  avm_codec_err_t res = AVM_CODEC_OK;
  AV2_COMMON *const cm = &pbi->common;
  RefCntBuffer *output_candidate = NULL;
  do {
    output_candidate = NULL;
    for (int i = 0; i < REF_FRAMES; i++) {
      RefCntBuffer *const buf = cm->ref_frame_map[i];
      if (buf == NULL) continue;
      if (!is_frame_eligible_for_output(buf)) continue;
      if ((int)buf->display_order_hint >= order_hint_limit) continue;

      if ((output_candidate == NULL ||
           derive_output_order_idx(cm, buf) <=
               derive_output_order_idx(cm, output_candidate))) {
        output_candidate = buf;
      }
    }
    if (output_candidate != NULL) {
      if (pbi->num_output_frames >= (REF_FRAMES + 1) * AVM_MAX_NUM_STREAMS) {
        return AVM_CODEC_MEM_ERROR;
      }
      assign_output_frame_buffer_p(
          &pbi->output_frames[pbi->num_output_frames++], output_candidate);
      output_candidate->frame_output_done = 1;
    }
  } while (output_candidate != NULL);
  return res;
}

// This function outputs frames that are ready to be output.
// The output frames may be the output trigger frame along with
// past frames that have not yet been output,
// and/or future frames that are continuous with the output trigger frame.
// The output trigger frame is the current frame or
// the frame to be flushed out from the ref_frame_map slot.
// ref_idx == -1 indicates the output process is trigged by
// decoding the current frame.
void output_frame_buffers(AV2Decoder *pbi, int ref_idx) {
  AV2_COMMON *const cm = &pbi->common;
  RefCntBuffer *trigger_frame = NULL;
  RefCntBuffer *output_candidate = NULL;

  // Determine if the triggering frame is the current frame or a frame
  // already stored in the refrence buffer.
  trigger_frame = (ref_idx >= 0) ? cm->ref_frame_map[ref_idx] : cm->cur_frame;

  // Add the previous frames into the output queue.
  do {
    output_candidate = trigger_frame;
    for (int i = 0; i < cm->seq_params.ref_frames; i++) {
      if (is_frame_eligible_for_output(cm->ref_frame_map[i]) &&
          derive_output_order_idx(cm, cm->ref_frame_map[i]) <
              derive_output_order_idx(cm, output_candidate)) {
        output_candidate = cm->ref_frame_map[i];
      }
    }
    if (output_candidate != trigger_frame) {
      assign_output_frame_buffer_p(
          &pbi->output_frames[pbi->num_output_frames++], output_candidate);
      output_candidate->frame_output_done = 1;
#if CONFIG_BITSTREAM_DEBUG
      avm_bitstream_queue_set_frame_read(
          derive_output_order_idx(cm, output_candidate) * 2 + 1);
#endif  // CONFIG_BITSTREAM_DEBUG
#if CONFIG_MISMATCH_DEBUG
      mismatch_move_frame_idx_r(0);
#endif  // CONFIG_MISMATCH_DEBUG
    }
  } while (output_candidate != trigger_frame);

  // Add the output triggering frame into the output queue.
  assign_output_frame_buffer_p(&pbi->output_frames[pbi->num_output_frames++],
                               trigger_frame);
  trigger_frame->frame_output_done = 1;

#if CONFIG_BITSTREAM_DEBUG
  if (trigger_frame->order_hint != cm->cur_frame->order_hint) {
    avm_bitstream_queue_set_frame_read(
        derive_output_order_idx(cm, trigger_frame) * 2 + 1);
  }
#endif  // CONFIG_BITSTREAM_DEBUG
#if CONFIG_MISMATCH_DEBUG
  if (trigger_frame->display_order_hint != cm->cur_frame->display_order_hint)
    mismatch_move_frame_idx_r(0);
#endif  // CONFIG_MISMATCH_DEBUG

  // Add the next frames (implicit_output_picture == 1) into the output queue.
  uint64_t trigger_frame_output_order =
      derive_output_order_idx(cm, trigger_frame);

  int successive_output = 1;
  for (int k = 1; k <= cm->seq_params.ref_frames && successive_output > 0;
       k++) {
    uint64_t next_frame_output_order = trigger_frame_output_order + k;
    successive_output = 0;
    for (int i = 0; i < cm->seq_params.ref_frames; i++) {
      if (is_frame_eligible_for_output(cm->ref_frame_map[i]) &&
          derive_output_order_idx(cm, cm->ref_frame_map[i]) ==
              next_frame_output_order) {
        assign_output_frame_buffer_p(
            &pbi->output_frames[pbi->num_output_frames++],
            cm->ref_frame_map[i]);
        cm->ref_frame_map[i]->frame_output_done = 1;
        successive_output++;
#if CONFIG_BITSTREAM_DEBUG
        avm_bitstream_queue_set_frame_read(
            derive_output_order_idx(cm, cm->ref_frame_map[i]) * 2 + 1);
#endif  // CONFIG_BITSTREAM_DEBUG
#if CONFIG_MISMATCH_DEBUG
        mismatch_move_frame_idx_r(0);
#endif  // CONFIG_MISMATCH_DEBUG
      }
    }
  }
}

// If any buffer updating is signaled it should be done here.
// Consumes a reference to cm->cur_frame.
//
// This functions returns void. It reports failure by setting
// cm->error.error_code.
static void update_frame_buffers(AV2Decoder *pbi, int frame_decoded) {
  int ref_index = 0;
  AV2_COMMON *const cm = &pbi->common;
  BufferPool *const pool = cm->buffer_pool;

  pbi->output_frames_offset = 0;

  if (frame_decoded) {
    lock_buffer_pool(pool);

    // Don't clear is_restricted for bridge frames - they should maintain
    // the restricted status inherited from their reference frame
    if (!cm->bridge_frame_info.is_bridge_frame) {
      cm->cur_frame->is_restricted = false;
    }

    int first_ref_index;
    const bool clear_multiple_insert_in_one =
        av2_frame_clears_multiple_inserted_in_one(
            cm->current_frame.refresh_frame_flags, cm->current_frame.frame_type,
            cm->seq_params.max_mlayer_id, &first_ref_index);

    // The following for loop needs to release the reference stored in
    // cm->ref_frame_map[ref_index] before storing a reference to
    // cm->cur_frame in cm->ref_frame_map[ref_index].
    for (int mask = cm->current_frame.refresh_frame_flags; mask; mask >>= 1) {
      if (mask & 1) {
        if (pbi->bru_opt_mode && cm->bru.enabled) {
          if (ref_index == cm->bru.explicit_ref_idx) {
            ++ref_index;
            continue;  // skip refresh BRU ref
          }
        }
        if (is_frame_eligible_for_output(cm->ref_frame_map[ref_index]))
          output_frame_buffers(pbi, ref_index);
        decrease_ref_count(cm->ref_frame_map[ref_index], pool);

        if (av2_skip_reference_buffer_update(clear_multiple_insert_in_one,
                                             ref_index, first_ref_index)) {
          cm->ref_frame_map[ref_index] = NULL;
        } else {
          cm->ref_frame_map[ref_index] = cm->cur_frame;
          ++cm->cur_frame->ref_count;
        }
      }
      ++ref_index;
    }
    update_subgop_stats(cm, &pbi->subgop_stats, cm->cur_frame->order_hint,
                        pbi->enable_subgop_stats);
    if (((cm->immediate_output_picture && !cm->cur_frame->frame_output_done) ||
         cm->show_existing_frame)) {
      output_frame_buffers(pbi, -1);
      decrease_ref_count(cm->cur_frame, pool);
    } else {
      decrease_ref_count(cm->cur_frame, pool);
    }
    unlock_buffer_pool(pool);
  } else {
    // Nothing was decoded, so just drop this frame buffer
    lock_buffer_pool(pool);
    decrease_ref_count(cm->cur_frame, pool);
    unlock_buffer_pool(pool);
  }
  cm->cur_frame = NULL;

  // Invalidate these references until the next frame starts.
  for (ref_index = 0; ref_index < INTER_REFS_PER_FRAME; ref_index++) {
    cm->remapped_ref_idx[ref_index] = INVALID_IDX;
  }
}

// If the refresh_frame_flags bitmask is set, update long-term frame id values
// and mark frames as valid for reference.
static AVM_INLINE void update_long_term_frame_id(AV2Decoder *const pbi) {
  AV2_COMMON *const cm = &pbi->common;
  const int refresh_frame_flags = cm->current_frame.refresh_frame_flags;
  int first_ref_index;
  const bool clear_multiple_insert_in_one =
      av2_frame_clears_multiple_inserted_in_one(
          refresh_frame_flags, cm->current_frame.frame_type,
          cm->seq_params.max_mlayer_id, &first_ref_index);
  for (int i = 0; i < cm->seq_params.ref_frames; i++) {
    if ((refresh_frame_flags >> i) & 1) {
      if (av2_skip_reference_buffer_update(clear_multiple_insert_in_one, i,
                                           first_ref_index)) {
        pbi->long_term_ids_in_buffer[i] = -1;
        pbi->valid_for_referencing[i] = 0;
      } else {
        pbi->long_term_ids_in_buffer[i] = cm->cur_frame->long_term_id;
        pbi->valid_for_referencing[i] = 1;
      }
    }
  }
}

int av2_receive_compressed_data(AV2Decoder *pbi, size_t size,
                                const uint8_t **psource) {
  AV2_COMMON *volatile const cm = &pbi->common;
  const uint8_t *source = *psource;
  cm->error.error_code = AVM_CODEC_OK;
  cm->error.has_detail = 0;
  cm->decoding = 1;

  if (size == 0) {
    // This is used to signal that we are missing frames.
    // We do not know if the missing frame(s) was supposed to update
    // any of the reference buffers, but we act conservative and
    // mark only the last buffer as corrupted.
    //
    // TODO(jkoleszar): Error concealment is undefined and non-normative
    // at this point, but if it becomes so, [0] may not always be the correct
    // thing to do here.
    const int last_frame = get_closest_pastcur_ref_or_ref0(cm);
    RefCntBuffer *ref_buf = get_ref_frame_buf(cm, last_frame);
    if (ref_buf != NULL) ref_buf->buf.corrupted = 1;
  }
  check_ref_count_status_dec(pbi);
  if (assign_cur_frame_new_fb(cm) == NULL) {
    cm->error.error_code = AVM_CODEC_MEM_ERROR;
    return 1;
  }

  // The jmp_buf is valid only for the duration of the function that calls
  // setjmp(). Therefore, this function must reset the 'setjmp' field to 0
  // before it returns.
  if (setjmp(cm->error.jmp)) {
    const AVxWorkerInterface *const winterface = avm_get_worker_interface();
    int i;

    cm->error.setjmp = 0;

    // Synchronize all threads immediately as a subsequent decode call may
    // cause a resize invalidating some allocations.
    winterface->sync(&pbi->lf_worker);
    for (i = 0; i < pbi->num_workers; ++i) {
      winterface->sync(&pbi->tile_workers[i]);
    }

    release_current_frame(pbi);
    avm_clear_system_state();
    return -1;
  }

  cm->error.setjmp = 1;

  int frame_decoded =
      avm_decode_frame_from_obus(pbi, source, source + size, psource);
#if CONFIG_INSPECTION
  if (cm->features.tip_frame_mode == TIP_FRAME_AS_OUTPUT) {
    if (pbi->inspect_tip_cb != NULL) {
      (*pbi->inspect_tip_cb)(pbi, pbi->inspect_ctx);
    }
  }
#endif

  if (frame_decoded < 0) {
    assert(cm->error.error_code != AVM_CODEC_OK);
    release_current_frame(pbi);
    cm->error.setjmp = 0;
    return 1;
  }

#if TXCOEFF_TIMER
  cm->cum_txcoeff_timer += cm->txcoeff_timer;
  fprintf(stderr,
          "txb coeff block number: %d, frame time: %ld, cum time %ld in us\n",
          cm->txb_count, cm->txcoeff_timer, cm->cum_txcoeff_timer);
  cm->txcoeff_timer = 0;
  cm->txb_count = 0;
#endif

  if (frame_decoded) {
    update_long_term_frame_id(pbi);
  }

  // Note: At this point, this function holds a reference to cm->cur_frame
  // in the buffer pool. This reference is consumed by update_frame_buffers().
  check_ref_count_status_dec(pbi);
  update_frame_buffers(pbi, frame_decoded);
  check_ref_count_status_dec(pbi);

  if (frame_decoded) {
    pbi->decoding_first_frame = 0;
  }

  if (cm->error.error_code != AVM_CODEC_OK) {
    cm->error.setjmp = 0;
    return 1;
  }

  avm_clear_system_state();
  if (cm->seg.enabled) {
    if (cm->prev_frame && (cm->mi_params.mi_rows == cm->prev_frame->mi_rows) &&
        (cm->mi_params.mi_cols == cm->prev_frame->mi_cols)) {
      cm->last_frame_seg_map = cm->prev_frame->seg_map;
    } else {
      cm->last_frame_seg_map = NULL;
    }
  }

  // Update progress in frame parallel decode.
  cm->error.setjmp = 0;

  return 0;
}

// Get the frame at a particular index in the output queue
int av2_get_raw_frame(AV2Decoder *pbi, size_t index, YV12_BUFFER_CONFIG **sd,
                      avm_film_grain_t **grain_params) {
  if (index >= pbi->num_output_frames) return -1;
  *sd = &pbi->output_frames[index]->buf;
  *grain_params = &pbi->output_frames[index]->film_grain_params;
  avm_clear_system_state();
  return 0;
}

// Get the highest-spatial-layer output
// TODO(rachelbarker): What should this do?
int av2_get_frame_to_show(AV2Decoder *pbi, YV12_BUFFER_CONFIG *frame) {
  if (pbi->num_output_frames == 0) return -1;
  const size_t out_frame_idx = pbi->output_frames_offset;
  if (pbi->num_output_frames <= out_frame_idx) return -1;
  *frame = pbi->output_frames[out_frame_idx]->buf;
  return 0;
}