vp9_context_tree.c

/*
 *  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 "vp9/encoder/vp9_context_tree.h"
#include "vp9/encoder/vp9_encoder.h"

static const BLOCK_SIZE square[] = {
  BLOCK_8X8,
  BLOCK_16X16,
  BLOCK_32X32,
  BLOCK_64X64,
};

static void alloc_mode_context(VP9_COMMON *cm, int num_4x4_blk,
                               PICK_MODE_CONTEXT *ctx) {
  const int num_blk = (num_4x4_blk < 4 ? 4 : num_4x4_blk);
  const int num_pix = num_blk << 4;
  int i, k;
  ctx->num_4x4_blk = num_blk;

  CHECK_MEM_ERROR(cm, ctx->zcoeff_blk,
                  vpx_calloc(num_4x4_blk, sizeof(uint8_t)));
  for (i = 0; i < MAX_MB_PLANE; ++i) {
    for (k = 0; k < 3; ++k) {
      CHECK_MEM_ERROR(cm, ctx->coeff[i][k],
                      vpx_memalign(16, num_pix * sizeof(int16_t)));
      CHECK_MEM_ERROR(cm, ctx->qcoeff[i][k],
                      vpx_memalign(16, num_pix * sizeof(int16_t)));
      CHECK_MEM_ERROR(cm, ctx->dqcoeff[i][k],
                      vpx_memalign(16, num_pix * sizeof(int16_t)));
      CHECK_MEM_ERROR(cm, ctx->eobs[i][k],
                      vpx_memalign(16, num_pix * sizeof(uint16_t)));
      ctx->coeff_pbuf[i][k]   = ctx->coeff[i][k];
      ctx->qcoeff_pbuf[i][k]  = ctx->qcoeff[i][k];
      ctx->dqcoeff_pbuf[i][k] = ctx->dqcoeff[i][k];
      ctx->eobs_pbuf[i][k]    = ctx->eobs[i][k];
    }
  }
}

static void free_mode_context(PICK_MODE_CONTEXT *ctx) {
  int i, k;
  vpx_free(ctx->zcoeff_blk);
  ctx->zcoeff_blk = 0;
  for (i = 0; i < MAX_MB_PLANE; ++i) {
    for (k = 0; k < 3; ++k) {
      vpx_free(ctx->coeff[i][k]);
      ctx->coeff[i][k] = 0;
      vpx_free(ctx->qcoeff[i][k]);
      ctx->qcoeff[i][k] = 0;
      vpx_free(ctx->dqcoeff[i][k]);
      ctx->dqcoeff[i][k] = 0;
      vpx_free(ctx->eobs[i][k]);
      ctx->eobs[i][k] = 0;
    }
  }
}

static void alloc_tree_contexts(VP9_COMMON *cm, PC_TREE *tree,
                                int num_4x4_blk) {
  alloc_mode_context(cm, num_4x4_blk, &tree->none);
  alloc_mode_context(cm, num_4x4_blk/2, &tree->horizontal[0]);
  alloc_mode_context(cm, num_4x4_blk/2, &tree->vertical[0]);