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205 lines
6.5 KiB
205 lines
6.5 KiB
/******************************************************************************
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*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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/**
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*******************************************************************************
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* @file
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* ime.h
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*
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* @brief
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* Contains declarations of global variables for H264 encoder
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*
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* @author
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* Ittiam
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*
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* @remarks
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*
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*******************************************************************************
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*/
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#ifndef IME_H_
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#define IME_H_
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/*****************************************************************************/
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/* Constant Macros */
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/*****************************************************************************/
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/**
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******************************************************************************
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* @brief Number of iterations before exiting during diamond search
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******************************************************************************
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*/
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#define NUM_LAYERS 16
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/*****************************************************************************/
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/* Extern Function Declarations */
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/*****************************************************************************/
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/**
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*******************************************************************************
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*
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* @brief Diamond Search
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*
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* @par Description:
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* This function computes the sad at vertices of several layers of diamond grid
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* at a time. The number of layers of diamond grid that would be evaluated is
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* configurable.The function computes the sad at vertices of a diamond grid. If
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* the sad at the center of the diamond grid is lesser than the sad at any other
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* point of the diamond grid, the function marks the candidate Mb partition as
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* mv.
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*
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* @param[in] ps_mb_part
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* pointer to current mb partition ctxt with respect to ME
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*
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* @param[in] ps_me_ctxt
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* pointer to me context
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*
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* @param[in] u4_lambda
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* lambda motion
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*
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* @param[in] u4_fast_flag
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* enable/disable fast sad computation
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*
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* @returns mv pair & corresponding distortion and cost
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*
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* @remarks This module cannot be part of the final product due to its lack of
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* computational feasibility. This is only for quality eval purposes.
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*
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*******************************************************************************
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*/
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extern void ime_diamond_search_16x16(me_ctxt_t *ps_me_ctxt, WORD32 i4_reflist);
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/**
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*******************************************************************************
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*
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* @brief This function computes the best motion vector among the tentative mv
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* candidates chosen.
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*
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* @par Description:
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* This function determines the position in the search window at which the motion
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* estimation should begin in order to minimise the number of search iterations.
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*
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* @param[in] ps_mb_part
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* pointer to current mb partition ctxt with respect to ME
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*
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* @param[in] u4_lambda_motion
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* lambda motion
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*
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* @param[in] u4_fast_flag
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* enable/disable fast sad computation
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*
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* @returns mv pair & corresponding distortion and cost
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*
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* @remarks none
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*
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*******************************************************************************
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*/
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extern void ime_evaluate_init_srchposn_16x16(me_ctxt_t *ps_me_ctxt,
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WORD32 i4_reflist);
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/**
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*******************************************************************************
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*
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* @brief Searches for the best matching full pixel predictor within the search
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* range
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*
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* @par Description:
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* This function begins by computing the mv predict vector for the current mb.
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* This is used for cost computations. Further basing on the algo. chosen, it
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* looks through a set of candidate vectors that best represent the mb a least
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* cost and returns this information.
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*
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* @param[in] ps_proc
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* pointer to current proc ctxt
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*
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* @param[in] ps_me_ctxt
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* pointer to me context
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*
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* @returns mv pair & corresponding distortion and cost
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*
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* @remarks none
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*
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*******************************************************************************
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*/
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extern void ime_full_pel_motion_estimation_16x16(me_ctxt_t *ps_me_ctxt,
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WORD32 i4_ref_list);
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/**
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*******************************************************************************
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*
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* @brief Searches for the best matching sub pixel predictor within the search
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* range
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*
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* @par Description:
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* This function begins by searching across all sub pixel sample points
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* around the full pel motion vector. The vector with least cost is chosen as
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* the mv for the current mb. If the skip mode is not evaluated while analysing
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* the initial search candidates then analyse it here and update the mv.
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*
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* @param[in] ps_proc
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* pointer to current proc ctxt
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*
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* @param[in] ps_me_ctxt
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* pointer to me context
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*
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* @returns none
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*
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* @remarks none
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*
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*******************************************************************************
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*/
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extern void ime_sub_pel_motion_estimation_16x16(me_ctxt_t *ps_me_ctxt,
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WORD32 i4_reflist);
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/**
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*******************************************************************************
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*
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* @brief This function computes cost of skip macroblocks
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*
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* @par Description:
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*
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* @param[in] ps_me_ctxt
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* pointer to me ctxt
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*
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* @param[in] ps_skip_mv
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* pointer to skip mv
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*
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@param[in] is_slice_type_b
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* Whether slice type is BSLICE or not
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* @returns none
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*
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* @remarks
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* NOTE: while computing the skip cost, do not enable early exit from compute
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* sad function because, a negative bias gets added later
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*
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*******************************************************************************
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*/
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extern void ime_compute_skip_cost(me_ctxt_t *ps_me_ctxt,
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ime_mv_t *ps_skip_mv,
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mb_part_ctxt *ps_smb_part_info,
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UWORD32 u4_use_stat_sad,
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WORD32 i4_reflist,
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WORD32 is_slice_type_b);
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#endif /* IME_H_ */
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