av1/common/alloccommon.c - avm - Git at Google

 /*
  *
  * 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"

 int av1_get_MBs(int width, int height) {
   const int aligned_width = ALIGN_POWER_OF_TWO(width, 3);
   const int aligned_height = ALIGN_POWER_OF_TWO(height, 3);
   const int mi_cols = aligned_width >> MI_SIZE_LOG2;
   const int mi_rows = aligned_height >> MI_SIZE_LOG2;

   const int mb_cols = (mi_cols + 2) >> 2;
   const int mb_rows = (mi_rows + 2) >> 2;
   return mb_rows * mb_cols;
 }

 void av1_set_mb_mi(AV1_COMMON *cm, 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);

   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 + 2) >> 2;
   cm->mb_rows = (cm->mi_rows + 2) >> 2;
   cm->MBs = cm->mb_rows * cm->mb_cols;
 }

 #if !CONFIG_SEGMENT_PRED_LAST
 static int alloc_seg_map(AV1_COMMON *cm, int rows, int cols) {
   int i;
   int seg_map_size = rows * cols;

   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;
   }
   cm->seg_map_alloc_size = 0;
 }
 #endif

 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;
 #if CONFIG_SEGMENT_PRED_LAST
     aom_free(pool->frame_bufs[i].seg_map);
     pool->frame_bufs[i].seg_map = NULL;
 #endif
     aom_free_frame_buffer(&pool->frame_bufs[i].buf);
   }
 }

 #if CONFIG_LOOP_RESTORATION
 // Assumes cm->rst_info[p].restoration_unit_size is already initialized
 void av1_alloc_restoration_buffers(AV1_COMMON *cm) {
   const int num_planes = av1_num_planes(cm);
   for (int p = 0; p < num_planes; ++p)
     av1_alloc_restoration_struct(cm, &cm->rst_info[p], p > 0);
   aom_free(cm->rst_tmpbuf);
   CHECK_MEM_ERROR(cm, cm->rst_tmpbuf,
                   (int32_t *)aom_memalign(16, RESTORATION_TMPBUF_SIZE));

 #if CONFIG_STRIPED_LOOP_RESTORATION
   // For striped loop restoration, we divide each row of tiles into "stripes",
   // of height 64 luma pixels but with an offset by RESTORATION_TILE_OFFSET
   // luma pixels to match the output from CDEF. We will need to store 2 *
   // RESTORATION_CTX_VERT lines of data for each stripe, and also need to be
   // able to quickly answer the question "Where is the <n>'th stripe for tile
   // row <m>?" To make that efficient, we generate the rst_last_stripe array.
   int num_stripes = 0;
   for (int i = 0; i < cm->tile_rows; ++i) {
 #if CONFIG_MAX_TILE
     TileInfo tile_info;
     av1_tile_set_row(&tile_info, cm, i);
     const int mi_h = tile_info.mi_row_end - tile_info.mi_row_start;
 #else
     const int mi_h = ((i + 1) < cm->tile_rows)
                          ? cm->tile_height
                          : (cm->mi_rows - i * cm->tile_height);
 #endif
     const int ext_h = RESTORATION_TILE_OFFSET + (mi_h << MI_SIZE_LOG2);
     const int tile_stripes = (ext_h + 63) / 64;
     num_stripes += tile_stripes;
     cm->rst_end_stripe[i] = num_stripes;
   }

 // Now we need to allocate enough space to store the line buffers for the
 // stripes
 #if CONFIG_HORZONLY_FRAME_SUPERRES
   const int frame_w = cm->superres_upscaled_width;
 #else
   const int frame_w = cm->width;
 #endif  // CONFIG_HORZONLY_FRAME_SUPERRES
   const int use_highbd = cm->use_highbitdepth ? 1 : 0;

   for (int p = 0; p < num_planes; ++p) {
     const int is_uv = p > 0;
     const int ss_x = is_uv && cm->subsampling_x;
     const int plane_w = ((frame_w + ss_x) >> ss_x) + 2 * RESTORATION_EXTRA_HORZ;
     const int stride = ALIGN_POWER_OF_TWO(plane_w, 5);
     const int buf_size = num_stripes * stride * RESTORATION_CTX_VERT
                          << use_highbd;
     RestorationStripeBoundaries *boundaries = &cm->rst_info[p].boundaries;
     aom_free(boundaries->stripe_boundary_above);
     aom_free(boundaries->stripe_boundary_below);

     CHECK_MEM_ERROR(cm, boundaries->stripe_boundary_above,
                     (uint8_t *)aom_memalign(32, buf_size));
     CHECK_MEM_ERROR(cm, boundaries->stripe_boundary_below,
                     (uint8_t *)aom_memalign(32, buf_size));

     boundaries->stripe_boundary_stride = stride;
   }
 #endif  // CONFIG_STRIPED_LOOP_RESTORATION
 }

 void av1_free_restoration_buffers(AV1_COMMON *cm) {
   const int num_planes = av1_num_planes(cm);
   int p;
   for (p = 0; p < num_planes; ++p)
     av1_free_restoration_struct(&cm->rst_info[p]);
   aom_free(cm->rst_tmpbuf);
   cm->rst_tmpbuf = NULL;
 #if CONFIG_STRIPED_LOOP_RESTORATION
   for (p = 0; p < num_planes; ++p) {
     RestorationStripeBoundaries *boundaries = &cm->rst_info[p].boundaries;
     aom_free(boundaries->stripe_boundary_above);
     aom_free(boundaries->stripe_boundary_below);
     boundaries->stripe_boundary_above = NULL;
     boundaries->stripe_boundary_below = NULL;
   }
 #endif
 }
 #endif  // CONFIG_LOOP_RESTORATION

 void av1_free_context_buffers(AV1_COMMON *cm) {
   const int num_planes = av1_num_planes(cm);
   int i;
   cm->free_mi(cm);

   aom_free(cm->boundary_info);
   cm->boundary_info_alloc_size = 0;
   cm->boundary_info = NULL;

 #if !CONFIG_SEGMENT_PRED_LAST
   free_seg_map(cm);
 #endif
   for (i = 0; i < num_planes; i++) {
     aom_free(cm->above_context[i]);
     cm->above_context[i] = NULL;
   }
   aom_free(cm->above_seg_context);
   cm->above_seg_context = NULL;
   cm->above_context_alloc_cols = 0;
   aom_free(cm->above_txfm_context);
   cm->above_txfm_context = NULL;

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

 int av1_alloc_context_buffers(AV1_COMMON *cm, int width, int height) {
   const int num_planes = av1_num_planes(cm);
   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;
   }

   const int new_boundary_info_alloc_size = cm->mi_rows * cm->mi_stride;
   if (cm->boundary_info_alloc_size < new_boundary_info_alloc_size) {
     aom_free(cm->boundary_info);
     cm->boundary_info = (BOUNDARY_TYPE *)aom_calloc(
         new_boundary_info_alloc_size, sizeof(BOUNDARY_TYPE));
     cm->boundary_info_alloc_size = 0;
     if (!cm->boundary_info) goto fail;
     cm->boundary_info_alloc_size = new_boundary_info_alloc_size;
   }

 #if !CONFIG_SEGMENT_PRED_LAST
   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;
   }
 #endif

   if (cm->above_context_alloc_cols < cm->mi_cols) {
     // TODO(geza.lore): These are bigger than they need to be.
     // cm->tile_width would be enough but it complicates indexing a
     // little elsewhere.
     const int aligned_mi_cols =
         ALIGN_POWER_OF_TWO(cm->mi_cols, MAX_MIB_SIZE_LOG2);
     int i;

     for (i = 0; i < num_planes; i++) {
       aom_free(cm->above_context[i]);
       cm->above_context[i] = (ENTROPY_CONTEXT *)aom_calloc(
           aligned_mi_cols << (MI_SIZE_LOG2 - tx_size_wide_log2[0]),
           sizeof(*cm->above_context[0]));
       if (!cm->above_context[i]) goto fail;
     }

     aom_free(cm->above_seg_context);
     cm->above_seg_context = (PARTITION_CONTEXT *)aom_calloc(
         aligned_mi_cols, sizeof(*cm->above_seg_context));
     if (!cm->above_seg_context) goto fail;

     aom_free(cm->above_txfm_context);
     cm->above_txfm_context = (TXFM_CONTEXT *)aom_calloc(
         aligned_mi_cols << TX_UNIT_WIDE_LOG2, sizeof(*cm->above_txfm_context));
     if (!cm->above_txfm_context) goto fail;

     for (i = 0; i < num_planes; ++i) {
       aom_free(cm->top_txfm_context[i]);
       cm->top_txfm_context[i] =
           (TXFM_CONTEXT *)aom_calloc(aligned_mi_cols << TX_UNIT_WIDE_LOG2,
                                      sizeof(*cm->top_txfm_context[0]));
       if (!cm->top_txfm_context[i]) goto fail;
     }

     cm->above_context_alloc_cols = aligned_mi_cols;
   }

   return 0;

 fail:
   // clear the mi_* values to force a realloc on resync
   av1_set_mb_mi(cm, 0, 0);
   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 !CONFIG_SEGMENT_PRED_LAST
   if (cm->last_frame_seg_map && !cm->frame_parallel_decode)
     memset(cm->last_frame_seg_map, 0, cm->mi_rows * cm->mi_cols);
 #endif
 }
 #if !CONFIG_SEGMENT_PRED_LAST
 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];
 }
 #endif
	/*
	*
	* 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"

	int av1_get_MBs(int width, int height) {
	const int aligned_width = ALIGN_POWER_OF_TWO(width, 3);
	const int aligned_height = ALIGN_POWER_OF_TWO(height, 3);
	const int mi_cols = aligned_width >> MI_SIZE_LOG2;
	const int mi_rows = aligned_height >> MI_SIZE_LOG2;

	const int mb_cols = (mi_cols + 2) >> 2;
	const int mb_rows = (mi_rows + 2) >> 2;
	return mb_rows * mb_cols;
	}

	void av1_set_mb_mi(AV1_COMMON *cm, 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);

	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 + 2) >> 2;
	cm->mb_rows = (cm->mi_rows + 2) >> 2;
	cm->MBs = cm->mb_rows * cm->mb_cols;
	}

	#if !CONFIG_SEGMENT_PRED_LAST
	static int alloc_seg_map(AV1_COMMON *cm, int rows, int cols) {
	int i;
	int seg_map_size = rows * cols;

	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;
	}
	cm->seg_map_alloc_size = 0;
	}
	#endif

	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;
	#if CONFIG_SEGMENT_PRED_LAST
	aom_free(pool->frame_bufs[i].seg_map);
	pool->frame_bufs[i].seg_map = NULL;
	#endif
	aom_free_frame_buffer(&pool->frame_bufs[i].buf);
	}
	}

	#if CONFIG_LOOP_RESTORATION
	// Assumes cm->rst_info[p].restoration_unit_size is already initialized
	void av1_alloc_restoration_buffers(AV1_COMMON *cm) {
	const int num_planes = av1_num_planes(cm);
	for (int p = 0; p < num_planes; ++p)
	av1_alloc_restoration_struct(cm, &cm->rst_info[p], p > 0);
	aom_free(cm->rst_tmpbuf);
	CHECK_MEM_ERROR(cm, cm->rst_tmpbuf,
	(int32_t *)aom_memalign(16, RESTORATION_TMPBUF_SIZE));

	#if CONFIG_STRIPED_LOOP_RESTORATION
	// For striped loop restoration, we divide each row of tiles into "stripes",
	// of height 64 luma pixels but with an offset by RESTORATION_TILE_OFFSET
	// luma pixels to match the output from CDEF. We will need to store 2 *
	// RESTORATION_CTX_VERT lines of data for each stripe, and also need to be
	// able to quickly answer the question "Where is the <n>'th stripe for tile
	// row <m>?" To make that efficient, we generate the rst_last_stripe array.
	int num_stripes = 0;
	for (int i = 0; i < cm->tile_rows; ++i) {
	#if CONFIG_MAX_TILE
	TileInfo tile_info;
	av1_tile_set_row(&tile_info, cm, i);
	const int mi_h = tile_info.mi_row_end - tile_info.mi_row_start;
	#else
	const int mi_h = ((i + 1) < cm->tile_rows)
	? cm->tile_height
	: (cm->mi_rows - i * cm->tile_height);
	#endif
	const int ext_h = RESTORATION_TILE_OFFSET + (mi_h << MI_SIZE_LOG2);
	const int tile_stripes = (ext_h + 63) / 64;
	num_stripes += tile_stripes;
	cm->rst_end_stripe[i] = num_stripes;
	}

	// Now we need to allocate enough space to store the line buffers for the
	// stripes
	#if CONFIG_HORZONLY_FRAME_SUPERRES
	const int frame_w = cm->superres_upscaled_width;
	#else
	const int frame_w = cm->width;
	#endif // CONFIG_HORZONLY_FRAME_SUPERRES
	const int use_highbd = cm->use_highbitdepth ? 1 : 0;

	for (int p = 0; p < num_planes; ++p) {
	const int is_uv = p > 0;
	const int ss_x = is_uv && cm->subsampling_x;
	const int plane_w = ((frame_w + ss_x) >> ss_x) + 2 * RESTORATION_EXTRA_HORZ;
	const int stride = ALIGN_POWER_OF_TWO(plane_w, 5);
	const int buf_size = num_stripes * stride * RESTORATION_CTX_VERT
	<< use_highbd;
	RestorationStripeBoundaries *boundaries = &cm->rst_info[p].boundaries;
	aom_free(boundaries->stripe_boundary_above);
	aom_free(boundaries->stripe_boundary_below);

	CHECK_MEM_ERROR(cm, boundaries->stripe_boundary_above,
	(uint8_t *)aom_memalign(32, buf_size));
	CHECK_MEM_ERROR(cm, boundaries->stripe_boundary_below,
	(uint8_t *)aom_memalign(32, buf_size));

	boundaries->stripe_boundary_stride = stride;
	}
	#endif // CONFIG_STRIPED_LOOP_RESTORATION
	}

	void av1_free_restoration_buffers(AV1_COMMON *cm) {
	const int num_planes = av1_num_planes(cm);
	int p;
	for (p = 0; p < num_planes; ++p)
	av1_free_restoration_struct(&cm->rst_info[p]);
	aom_free(cm->rst_tmpbuf);
	cm->rst_tmpbuf = NULL;
	#if CONFIG_STRIPED_LOOP_RESTORATION
	for (p = 0; p < num_planes; ++p) {
	RestorationStripeBoundaries *boundaries = &cm->rst_info[p].boundaries;
	aom_free(boundaries->stripe_boundary_above);
	aom_free(boundaries->stripe_boundary_below);
	boundaries->stripe_boundary_above = NULL;
	boundaries->stripe_boundary_below = NULL;
	}
	#endif
	}
	#endif // CONFIG_LOOP_RESTORATION

	void av1_free_context_buffers(AV1_COMMON *cm) {
	const int num_planes = av1_num_planes(cm);
	int i;
	cm->free_mi(cm);

	aom_free(cm->boundary_info);
	cm->boundary_info_alloc_size = 0;
	cm->boundary_info = NULL;

	#if !CONFIG_SEGMENT_PRED_LAST
	free_seg_map(cm);
	#endif
	for (i = 0; i < num_planes; i++) {
	aom_free(cm->above_context[i]);
	cm->above_context[i] = NULL;
	}
	aom_free(cm->above_seg_context);
	cm->above_seg_context = NULL;
	cm->above_context_alloc_cols = 0;
	aom_free(cm->above_txfm_context);
	cm->above_txfm_context = NULL;

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

	int av1_alloc_context_buffers(AV1_COMMON *cm, int width, int height) {
	const int num_planes = av1_num_planes(cm);
	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;
	}

	const int new_boundary_info_alloc_size = cm->mi_rows * cm->mi_stride;
	if (cm->boundary_info_alloc_size < new_boundary_info_alloc_size) {
	aom_free(cm->boundary_info);
	cm->boundary_info = (BOUNDARY_TYPE *)aom_calloc(
	new_boundary_info_alloc_size, sizeof(BOUNDARY_TYPE));
	cm->boundary_info_alloc_size = 0;
	if (!cm->boundary_info) goto fail;
	cm->boundary_info_alloc_size = new_boundary_info_alloc_size;
	}

	#if !CONFIG_SEGMENT_PRED_LAST
	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;
	}
	#endif

	if (cm->above_context_alloc_cols < cm->mi_cols) {
	// TODO(geza.lore): These are bigger than they need to be.
	// cm->tile_width would be enough but it complicates indexing a
	// little elsewhere.
	const int aligned_mi_cols =
	ALIGN_POWER_OF_TWO(cm->mi_cols, MAX_MIB_SIZE_LOG2);
	int i;

	for (i = 0; i < num_planes; i++) {
	aom_free(cm->above_context[i]);
	cm->above_context[i] = (ENTROPY_CONTEXT *)aom_calloc(
	aligned_mi_cols << (MI_SIZE_LOG2 - tx_size_wide_log2[0]),
	sizeof(*cm->above_context[0]));
	if (!cm->above_context[i]) goto fail;
	}

	aom_free(cm->above_seg_context);
	cm->above_seg_context = (PARTITION_CONTEXT *)aom_calloc(
	aligned_mi_cols, sizeof(*cm->above_seg_context));
	if (!cm->above_seg_context) goto fail;

	aom_free(cm->above_txfm_context);
	cm->above_txfm_context = (TXFM_CONTEXT *)aom_calloc(
	aligned_mi_cols << TX_UNIT_WIDE_LOG2, sizeof(*cm->above_txfm_context));
	if (!cm->above_txfm_context) goto fail;

	for (i = 0; i < num_planes; ++i) {
	aom_free(cm->top_txfm_context[i]);
	cm->top_txfm_context[i] =
	(TXFM_CONTEXT *)aom_calloc(aligned_mi_cols << TX_UNIT_WIDE_LOG2,
	sizeof(*cm->top_txfm_context[0]));
	if (!cm->top_txfm_context[i]) goto fail;
	}

	cm->above_context_alloc_cols = aligned_mi_cols;
	}

	return 0;

	fail:
	// clear the mi_* values to force a realloc on resync
	av1_set_mb_mi(cm, 0, 0);
	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 !CONFIG_SEGMENT_PRED_LAST
	if (cm->last_frame_seg_map && !cm->frame_parallel_decode)
	memset(cm->last_frame_seg_map, 0, cm->mi_rows * cm->mi_cols);
	#endif
	}
	#if !CONFIG_SEGMENT_PRED_LAST
	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];
	}
	#endif