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aq_cyclicrefresh.h (10737B)

---

/*
* 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.
*/

#ifndef AOM_AV1_ENCODER_AQ_CYCLICREFRESH_H_
#define AOM_AV1_ENCODER_AQ_CYCLICREFRESH_H_

#include "av1/common/blockd.h"
#include "av1/encoder/block.h"
#include "av1/encoder/tokenize.h"

#ifdef __cplusplus
extern "C" {
#endif

// The segment ids used in cyclic refresh: from base (no boost) to increasing
// boost (higher delta-qp).
#define CR_SEGMENT_ID_BASE 0
#define CR_SEGMENT_ID_BOOST1 1
#define CR_SEGMENT_ID_BOOST2 2

// Maximum rate target ratio for setting segment delta-qp.
#define CR_MAX_RATE_TARGET_RATIO 4.0

/*!
* \brief The stucture of CYCLIC_REFRESH.
* \ingroup cyclic_refresh
*/
struct CYCLIC_REFRESH {
 /*!
  * Percentage of blocks per frame that are targeted as candidates
  * for cyclic refresh.
  */
 int percent_refresh;

 /*!
  * Active adjustment delta for cyclic refresh for rate control.
  */
 int percent_refresh_adjustment;

 /*!
  * Maximum q-delta as percentage of base q.
  */
 int max_qdelta_perc;
 /*!
  *Superblock starting index for cycling through the frame.
  */
 int sb_index;
 /*!
  *Superblock index cyclic refresh index last frame
  */
 int last_sb_index;
 /*!
  * Controls how long block will need to wait to be refreshed again, in
  * excess of the cycle time, i.e., in the case of all zero motion, block
  * will be refreshed every (100/percent_refresh + time_for_refresh) frames.
  */
 int time_for_refresh;
 /*!
  * Target number of (4x4) blocks that are set for delta-q.
  */
 int target_num_seg_blocks;
 /*!
  * Actual number of (4x4) blocks that were applied delta-q,
  * for segment 1.
  */
 int actual_num_seg1_blocks;
 /*!
  * Actual number of (4x4) blocks that were applied delta-q,
  * for segment 2.
  */
 int actual_num_seg2_blocks;
 /*!
  * RD mult. parameters for segment 1.
  */
 int rdmult;
 /*!
  * Cyclic refresh map.
  */
 int8_t *map;
 /*!
  * Threshold applied to the projected rate of the coding block,
  * when deciding whether block should be refreshed.
  */
 int64_t thresh_rate_sb;
 /*!
  * Threshold applied to the projected distortion of the coding block,
  * when deciding whether block should be refreshed.
  */
 int64_t thresh_dist_sb;
 /*!
  * Threshold applied to the motion vector (in units of 1/8 pel) of the
  * coding block, when deciding whether block should be refreshed.
  */
 int16_t motion_thresh;
 /*!
  * Rate target ratio to set q delta.
  */
 double rate_ratio_qdelta;

 /*!
  * Active adjustment of qdelta rate ratio for enhanced rate control
  */
 double rate_ratio_qdelta_adjustment;

 /*!
  * Boost factor for rate target ratio, for segment CR_SEGMENT_ID_BOOST2.
  */
 int rate_boost_fac;

 /*!\cond */
 int qindex_delta[3];
 int apply_cyclic_refresh;
 int skip_over4x4;
 int counter_encode_maxq_scene_change;
 int use_block_sad_scene_det;
 /*!\endcond */
};

struct AV1_COMP;

typedef struct CYCLIC_REFRESH CYCLIC_REFRESH;

CYCLIC_REFRESH *av1_cyclic_refresh_alloc(int mi_rows, int mi_cols);

void av1_cyclic_refresh_free(CYCLIC_REFRESH *cr);

/*!\brief Estimate the bits, incorporating the delta-q from the segments.
*
* For the just encoded frame, estimate the bits, incorporating the delta-q
* from non-base segment(s). Note this function is called in the postencode
* (called from rc_update_rate_correction_factors()).
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]       cpi               Top level encoder structure
* \param[in]       correction_factor rate correction factor
*
* \return Return the estimated bits at given q.
*/
int av1_cyclic_refresh_estimate_bits_at_q(const struct AV1_COMP *cpi,
                                         double correction_factor);

/*!\brief Estimate the bits per mb, for given q = i and delta-q.
*
* Prior to encoding the frame, estimate the bits per mb, for a given q = i and
* a corresponding delta-q (for segment 1). This function is called in the
* rc_regulate_q() to set the base qp index. Note: the segment map is set to
* either 0/CR_SEGMENT_ID_BASE (no refresh) or to 1/CR_SEGMENT_ID_BOOST1
* (refresh) for each superblock, prior to encoding.
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]       cpi               Top level encoder structure
* \param[in]       i                 q index
* \param[in]       correction_factor rate correction factor
*
* \return Return the estimated bits for q = i and delta-q (segment 1).
*/
int av1_cyclic_refresh_rc_bits_per_mb(const struct AV1_COMP *cpi, int i,
                                     double correction_factor);

/*!\brief Update segment_id for blocks are skipped.
*
* After encoding a given prediction block, of size bsize at (mi_row, mi_col),
* check if we should reset the segment_id based on skip_txfm,
* and update the cyclic_refresh map and segmentation counters.
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]   cpi       Top level encoder structure
* \param[in]   x         Pointer to MACROBLOCK structure
* \param[in]   mi_row    Row coordinate of the block in a step size of MI_SIZE
* \param[in]   mi_col    Col coordinate of the block in a step size of MI_SIZE
* \param[in]   bsize     Block size
* \param[in]   dry_run   A code indicating whether it is part of the final
*                        pass for reconstructing the superblock
*
* \remark Update the \c mbmi->segment_id, the \c cpi->cyclic_refresh and
* the \c cm->cpi->enc_seg.map.
*/

void av1_cyclic_reset_segment_skip(const struct AV1_COMP *cpi,
                                  MACROBLOCK *const x, int mi_row, int mi_col,
                                  BLOCK_SIZE bsize, RUN_TYPE dry_run);

/*!\brief Update segment_id for block based on mode selected.
*
* Prior to coding a given prediction block, of size bsize at (mi_row, mi_col),
* check if we should reset the segment_id (based on mode/motion/skip selected
* for that block) and update the cyclic_refresh map and segmentation map.
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]   cpi       Top level encoder structure
* \param[in]   x         Pointer to MACROBLOCK structure
* \param[in]   mi_row    Row coordinate of the block in a step size of MI_SIZE
* \param[in]   mi_col    Col coordinate of the block in a step size of MI_SIZE
* \param[in]   bsize     Block size
* \param[in]   rate      Projected block rate from pickmode
* \param[in]   dist      Projected block dist from pickmode
* \param[in]   skip      Skip flag set from picmode
* \param[in]   dry_run   A code indicating whether it is part of the final
*                         pass for reconstructing the superblock
*
* \remark Update the \c mbmi->segment_id, the \c cpi->cyclic_refresh and
* the \c cm->cpi->enc_seg.map.
*/
void av1_cyclic_refresh_update_segment(const struct AV1_COMP *cpi,
                                      MACROBLOCK *const x, int mi_row,
                                      int mi_col, BLOCK_SIZE bsize,
                                      int64_t rate, int64_t dist, int skip,
                                      RUN_TYPE dry_run);

/*!\brief Initialize counters used for cyclic refresh.
*
* Initializes cyclic refresh counters actual_num_seg1_blocks and
* actual_num_seg2_blocks.
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]   x         Pointer to MACROBLOCK structure
*
* \remark Update the \c x->actual_num_seg1_blocks and the
* \c x->actual_num_seg2_blocks.
*/
void av1_init_cyclic_refresh_counters(MACROBLOCK *const x);

/*!\brief Accumulate cyclic refresh counters.
*
* Accumulates cyclic refresh counters actual_num_seg1_blocks and
* actual_num_seg2_blocks from MACROBLOCK strcture to CYCLIC_REFRESH strcture.
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]   cyclic_refresh Pointer to CYCLIC_REFRESH structure
* \param[in]   x              Pointer to MACROBLOCK structure
*
* \remark Update the \c cyclic_refresh->actual_num_seg1_blocks and the
* \c cyclic_refresh->actual_num_seg2_blocks.
*/
void av1_accumulate_cyclic_refresh_counters(
   CYCLIC_REFRESH *const cyclic_refresh, const MACROBLOCK *const x);

/*!\brief Set golden frame update interval nased on cyclic refresh.
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]   cpi       Top level encoder structure
*
* \remark Returns the interval in \c cpi->rc.baseline_gf_interval.
*/
void av1_cyclic_refresh_set_golden_update(struct AV1_COMP *const cpi);

/*!\brief Set the global/frame level parameters for cyclic refresh.
*
* First call to the cyclic refresh, before encoding the frame.
* Sets the flag on whether cyclic refresh should be applied, sets
* the amount/percent of refresh, and the amount of boost applied to
* the two segments (set by rate_ratio_qdelta and rate_boost_fac).
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]       cpi          Top level encoder structure
*
* \remark Updates the \c cpi->cyclic_refresh with the settings.
*/
void av1_cyclic_refresh_update_parameters(struct AV1_COMP *const cpi);

/*!\brief Setup the cyclic background refresh.
*
* Set the delta q for the segment(s), and set the segmentation map.
*
* \ingroup cyclic_refresh
* \callgraph
* \callergraph
*
* \param[in]       cpi          Top level encoder structure
*
* \remark Updates the \c cpi->cyclic_refresh with the cyclic refresh
* parameters and the \c cm->seg with the segmentation data.
*/
void av1_cyclic_refresh_setup(struct AV1_COMP *const cpi);

int av1_cyclic_refresh_get_rdmult(const CYCLIC_REFRESH *cr);

int av1_cyclic_refresh_disable_lf_cdef(struct AV1_COMP *const cpi);

static inline int cyclic_refresh_segment_id_boosted(int segment_id) {
 return segment_id == CR_SEGMENT_ID_BOOST1 ||
        segment_id == CR_SEGMENT_ID_BOOST2;
}

static inline int cyclic_refresh_segment_id(int segment_id) {
 if (segment_id == CR_SEGMENT_ID_BOOST1)
   return CR_SEGMENT_ID_BOOST1;
 else if (segment_id == CR_SEGMENT_ID_BOOST2)
   return CR_SEGMENT_ID_BOOST2;
 else
   return CR_SEGMENT_ID_BASE;
}

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

#endif  // AOM_AV1_ENCODER_AQ_CYCLICREFRESH_H_