/*
 *  Copyright (c) 2012 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.
 */

#ifndef VPX_VP9_COMMON_VP9_SEG_COMMON_H_
#define VPX_VP9_COMMON_VP9_SEG_COMMON_H_

#include "vpx_dsp/prob.h"

#ifdef __cplusplus
extern "C" {
#endif

#define SEGMENT_DELTADATA 0
#define SEGMENT_ABSDATA 1

#define MAX_SEGMENTS 8
#define SEG_TREE_PROBS (MAX_SEGMENTS - 1)

#define PREDICTION_PROBS 3

// Segment ID used to skip background encoding
#define BACKGROUND_SEG_SKIP_ID 3
// Number of frames that don't skip after a key frame
#define FRAMES_NO_SKIPPING_AFTER_KEY 20

// Segment level features.
typedef enum {
  SEG_LVL_ALT_Q = 0,      // Use alternate Quantizer ....
  SEG_LVL_ALT_LF = 1,     // Use alternate loop filter value...
  SEG_LVL_REF_FRAME = 2,  // Optional Segment reference frame
  SEG_LVL_SKIP = 3,       // Optional Segment (0,0) + skip mode
  SEG_LVL_MAX = 4         // Number of features supported
} SEG_LVL_FEATURES;

struct segmentation {
  uint8_t enabled;
  uint8_t update_map;
  uint8_t update_data;
  uint8_t abs_delta;
  uint8_t temporal_update;

  vpx_prob tree_probs[SEG_TREE_PROBS];
  vpx_prob pred_probs[PREDICTION_PROBS];

  int16_t feature_data[MAX_SEGMENTS][SEG_LVL_MAX];
  uint32_t feature_mask[MAX_SEGMENTS];
  int aq_av_offset;
};

static INLINE int segfeature_active(const struct segmentation *seg,
                                    int segment_id,
                                    SEG_LVL_FEATURES feature_id) {
  return seg->enabled && (seg->feature_mask[segment_id] & (1 << feature_id));
}

void vp9_clearall_segfeatures(struct segmentation *seg);

void vp9_enable_segfeature(struct segmentation *seg, int segment_id,
                           SEG_LVL_FEATURES feature_id);

int vp9_seg_feature_data_max(SEG_LVL_FEATURES feature_id);

int vp9_is_segfeature_signed(SEG_LVL_FEATURES feature_id);

void vp9_set_segdata(struct segmentation *seg, int segment_id,
                     SEG_LVL_FEATURES feature_id, int seg_data);

static INLINE int get_segdata(const struct segmentation *seg, int segment_id,
                              SEG_LVL_FEATURES feature_id) {
  return seg->feature_data[segment_id][feature_id];
}

extern const vpx_tree_index vp9_segment_tree[TREE_SIZE(MAX_SEGMENTS)];

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // VPX_VP9_COMMON_VP9_SEG_COMMON_H_