/*

 *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.

 *

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

 */

#include <assert.h>

#include "vp9/common/vp9_frame_buffers.h"

#include "vpx_mem/vpx_mem.h"

int vp9_alloc_internal_frame_buffers(InternalFrameBufferList *list) {

  const int num_buffers = VP9_MAXIMUM_REF_BUFFERS + VPX_MAXIMUM_WORK_BUFFERS;

  assert(list != NULL);

  vp9_free_internal_frame_buffers(list);

  list->int_fb =

      (InternalFrameBuffer *)vpx_calloc(num_buffers, sizeof(*list->int_fb));

  if (list->int_fb) {

    list->num_internal_frame_buffers = num_buffers;

    return 0;

  }

  return -1;

}

void vp9_free_internal_frame_buffers(InternalFrameBufferList *list) {

  int i;

  assert(list != NULL);

  for (i = 0; i < list->num_internal_frame_buffers; ++i) {

    vpx_free(list->int_fb[i].data);

    list->int_fb[i].data = NULL;

  }

  vpx_free(list->int_fb);

  list->int_fb = NULL;

  list->num_internal_frame_buffers = 0;

}

int vp9_get_frame_buffer(void *cb_priv, size_t min_size,

                         vpx_codec_frame_buffer_t *fb) {

  int i;

  InternalFrameBufferList *const int_fb_list =

      (InternalFrameBufferList *)cb_priv;

  if (int_fb_list == NULL) return -1;

  // Find a free frame buffer.

  for (i = 0; i < int_fb_list->num_internal_frame_buffers; ++i) {

    if (!int_fb_list->int_fb[i].in_use) break;

  }

  if (i == int_fb_list->num_internal_frame_buffers) return -1;

  if (int_fb_list->int_fb[i].size < min_size) {

    vpx_free(int_fb_list->int_fb[i].data);

    // The data must be zeroed to fix a valgrind error from the C loop filter

    // due to access uninitialized memory in frame border. It could be

    // skipped if border were totally removed.

    int_fb_list->int_fb[i].data = (uint8_t *)vpx_calloc(1, min_size);

    if (!int_fb_list->int_fb[i].data) return -1;

    int_fb_list->int_fb[i].size = min_size;

  }

  fb->data = int_fb_list->int_fb[i].data;

  fb->size = int_fb_list->int_fb[i].size;

  int_fb_list->int_fb[i].in_use = 1;

  // Set the frame buffer's private data to point at the internal frame buffer.

  fb->priv = &int_fb_list->int_fb[i];

  return 0;

}

int vp9_release_frame_buffer(void *cb_priv, vpx_codec_frame_buffer_t *fb) {

  InternalFrameBuffer *const int_fb = (InternalFrameBuffer *)fb->priv;

  (void)cb_priv;

  if (int_fb) int_fb->in_use = 0;

  return 0;

}