/*
 * 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 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.
 */

#include "./aom_config.h"
#include "aom_mem/aom_mem.h"

#include "av1/common/alloccommon.h"
#include "av1/common/blockd.h"
#include "av1/common/entropymode.h"
#include "av1/common/entropymv.h"
#include "av1/common/onyxc_int.h"

void av1_set_mb_mi(AV1_COMMON *cm, int width, int height) {
  const int aligned_width = ALIGN_POWER_OF_TWO(width, MI_SIZE_LOG2);
  const int aligned_height = ALIGN_POWER_OF_TWO(height, MI_SIZE_LOG2);

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

  cm->mb_cols = (cm->mi_cols + 1) >> 1;
  cm->mb_rows = (cm->mi_rows + 1) >> 1;
  cm->MBs = cm->mb_rows * cm->mb_cols;
}

static int alloc_seg_map(AV1_COMMON *cm, int seg_map_size) {
  int i;

  for (i = 0; i < NUM_PING_PONG_BUFFERS; ++i) {
    cm->seg_map_array[i] = (uint8_t *)aom_calloc(seg_map_size, 1);
    if (cm->seg_map_array[i] == NULL) return 1;
  }
  cm->seg_map_alloc_size = seg_map_size;

  // Init the index.
  cm->seg_map_idx = 0;
  cm->prev_seg_map_idx = 1;

  cm->current_frame_seg_map = cm->seg_map_array[cm->seg_map_idx];
  if (!cm->frame_parallel_decode)
    cm->last_frame_seg_map = cm->seg_map_array[cm->prev_seg_map_idx];

  return 0;
}

static void free_seg_map(AV1_COMMON *cm) {
  int i;

  for (i = 0; i < NUM_PING_PONG_BUFFERS; ++i) {
    aom_free(cm->seg_map_array[i]);
    cm->seg_map_array[i] = NULL;
  }

  cm->current_frame_seg_map = NULL;

  if (!cm->frame_parallel_decode) {
    cm->last_frame_seg_map = NULL;
  }
}

void av1_free_ref_frame_buffers(BufferPool *pool) {
  int i;

  for (i = 0; i < FRAME_BUFFERS; ++i) {
    if (pool->frame_bufs[i].ref_count > 0 &&
        pool->frame_bufs[i].raw_frame_buffer.data != NULL) {
      pool->release_fb_cb(pool->cb_priv, &pool->frame_bufs[i].raw_frame_buffer);
      pool->frame_bufs[i].ref_count = 0;
    }
    aom_free(pool->frame_bufs[i].mvs);
    pool->frame_bufs[i].mvs = NULL;
    aom_free_frame_buffer(&pool->frame_bufs[i].buf);
  }
}

void av1_free_context_buffers(AV1_COMMON *cm) {
  cm->free_mi(cm);
  free_seg_map(cm);
  aom_free(cm->above_context);
  cm->above_context = NULL;
  aom_free(cm->above_seg_context);
  cm->above_seg_context = NULL;
}

int av1_alloc_context_buffers(AV1_COMMON *cm, int width, int height) {
  int new_mi_size;

  av1_set_mb_mi(cm, width, height);
  new_mi_size = cm->mi_stride * calc_mi_size(cm->mi_rows);
  if (cm->mi_alloc_size < new_mi_size) {
    cm->free_mi(cm);
    if (cm->alloc_mi(cm, new_mi_size)) goto fail;
  }

  if (cm->seg_map_alloc_size < cm->mi_rows * cm->mi_cols) {
    // Create the segmentation map structure and set to 0.
    free_seg_map(cm);
    if (alloc_seg_map(cm, cm->mi_rows * cm->mi_cols)) goto fail;
  }

  if (cm->above_context_alloc_cols < cm->mi_cols) {
    aom_free(cm->above_context);
    cm->above_context = (ENTROPY_CONTEXT *)aom_calloc(
        2 * mi_cols_aligned_to_sb(cm->mi_cols) * MAX_MB_PLANE,
        sizeof(*cm->above_context));
    if (!cm->above_context) goto fail;

    aom_free(cm->above_seg_context);
    cm->above_seg_context = (PARTITION_CONTEXT *)aom_calloc(
        mi_cols_aligned_to_sb(cm->mi_cols), sizeof(*cm->above_seg_context));
    if (!cm->above_seg_context) goto fail;
    cm->above_context_alloc_cols = cm->mi_cols;
  }

  return 0;

fail:
  av1_free_context_buffers(cm);
  return 1;
}

void av1_remove_common(AV1_COMMON *cm) {
  av1_free_context_buffers(cm);

  aom_free(cm->fc);
  cm->fc = NULL;
  aom_free(cm->frame_contexts);
  cm->frame_contexts = NULL;
}

void av1_init_context_buffers(AV1_COMMON *cm) {
  cm->setup_mi(cm);
  if (cm->last_frame_seg_map && !cm->frame_parallel_decode)
    memset(cm->last_frame_seg_map, 0, cm->mi_rows * cm->mi_cols);
}

void av1_swap_current_and_last_seg_map(AV1_COMMON *cm) {
  // Swap indices.
  const int tmp = cm->seg_map_idx;
  cm->seg_map_idx = cm->prev_seg_map_idx;
  cm->prev_seg_map_idx = tmp;

  cm->current_frame_seg_map = cm->seg_map_array[cm->seg_map_idx];
  cm->last_frame_seg_map = cm->seg_map_array[cm->prev_seg_map_idx];
}