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/******************************************************************************
*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
/**
*******************************************************************************
* @file
* ime.h
*
* @brief
* Contains declarations of global variables for H264 encoder
*
* @author
* Ittiam
*
* @remarks
*
*******************************************************************************
*/
#ifndef IME_H_
#define IME_H_
/*****************************************************************************/
/* Constant Macros */
/*****************************************************************************/
/**
******************************************************************************
* @brief Number of iterations before exiting during diamond search
******************************************************************************
*/
#define NUM_LAYERS 16
/*****************************************************************************/
/* Extern Function Declarations */
/*****************************************************************************/
/**
*******************************************************************************
*
* @brief Diamond Search
*
* @par Description:
* This function computes the sad at vertices of several layers of diamond grid
* at a time. The number of layers of diamond grid that would be evaluated is
* configurable.The function computes the sad at vertices of a diamond grid. If
* the sad at the center of the diamond grid is lesser than the sad at any other
* point of the diamond grid, the function marks the candidate Mb partition as
* mv.
*
* @param[in] ps_mb_part
* pointer to current mb partition ctxt with respect to ME
*
* @param[in] ps_me_ctxt
* pointer to me context
*
* @param[in] u4_lambda
* lambda motion
*
* @param[in] u4_fast_flag
* enable/disable fast sad computation
*
* @returns mv pair & corresponding distortion and cost
*
* @remarks This module cannot be part of the final product due to its lack of
* computational feasibility. This is only for quality eval purposes.
*
*******************************************************************************
*/
extern void ime_diamond_search_16x16(me_ctxt_t *ps_me_ctxt);
/**
*******************************************************************************
*
* @brief This function computes the best motion vector among the tentative mv
* candidates chosen.
*
* @par Description:
* This function determines the position in the search window at which the motion
* estimation should begin in order to minimise the number of search iterations.
*
* @param[in] ps_mb_part
* pointer to current mb partition ctxt with respect to ME
*
* @param[in] u4_lambda_motion
* lambda motion
*
* @param[in] u4_fast_flag
* enable/disable fast sad computation
*
* @returns mv pair & corresponding distortion and cost
*
* @remarks none
*
*******************************************************************************
*/
extern void ime_evaluate_init_srchposn_16x16
(
me_ctxt_t *ps_me_ctxt
);
/**
*******************************************************************************
*
* @brief Searches for the best matching full pixel predictor within the search
* range
*
* @par Description:
* This function begins by computing the mv predict vector for the current mb.
* This is used for cost computations. Further basing on the algo. chosen, it
* looks through a set of candidate vectors that best represent the mb a least
* cost and returns this information.
*
* @param[in] ps_proc
* pointer to current proc ctxt
*
* @param[in] ps_me_ctxt
* pointer to me context
*
* @returns mv pair & corresponding distortion and cost
*
* @remarks none
*
*******************************************************************************
*/
extern void ime_full_pel_motion_estimation_16x16
(
me_ctxt_t *ps_me_ctxt
);
/**
*******************************************************************************
*
* @brief Searches for the best matching sub pixel predictor within the search
* range
*
* @par Description:
* This function begins by searching across all sub pixel sample points
* around the full pel motion vector. The vector with least cost is chosen as
* the mv for the current mb. If the skip mode is not evaluated while analysing
* the initial search candidates then analyse it here and update the mv.
*
* @param[in] ps_proc
* pointer to current proc ctxt
*
* @param[in] ps_me_ctxt
* pointer to me context
*
* @returns none
*
* @remarks none
*
*******************************************************************************
*/
extern void ime_sub_pel_motion_estimation_16x16
(
me_ctxt_t *ps_me_ctxt
);
/**
*******************************************************************************
*
* @brief This function computes cost of skip macroblocks
*
* @par Description:
*
* @param[in] ps_me_ctxt
* pointer to me ctxt
*
* @param[in] ps_skip_mv
* pointer to skip mv
*
* @returns none
*
* @remarks
* NOTE: while computing the skip cost, do not enable early exit from compute
* sad function because, a negative bias gets added later
*
*******************************************************************************
*/
extern void ime_compute_skip_cost
(
me_ctxt_t *ps_me_ctxt,
void *pv_skip_mv,
mb_part_ctxt *ps_smb_part_info,
UWORD32 u4_use_stat_sad
);
#endif /* IME_H_ */
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