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373 lines
11 KiB
373 lines
11 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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* ih264e_me.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 IH264E_ME_H_
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#define IH264E_ME_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 Skip Bias value for P slice
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******************************************************************************
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*/
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#define SKIP_BIAS_P 0
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/**
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******************************************************************************
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* @brief Skip Bias value for B slice
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******************************************************************************
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*/
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#define SKIP_BIAS_B 0
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/*****************************************************************************/
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/* Function Macros */
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/*****************************************************************************/
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/**
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******************************************************************************
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* @brief compute median of 3 elements (a, b, c) and store the output
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* in to result. This is used for mv prediction
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******************************************************************************
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*/
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#define MEDIAN(a, b, c, result) if (a > b){\
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if (b > c)\
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result = b;\
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else {\
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if (a > c)\
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result = c;\
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else \
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result = a;\
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}\
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}\
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else {\
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if (c > b)\
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result = b;\
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else {\
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if (c > a)\
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result = c;\
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else \
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result = a;\
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}\
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}
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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
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* This function populates the length of the codewords for motion vectors in the
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* range (-search range, search range) in pixels
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*
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* @param[in] ps_me
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* Pointer to me ctxt
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*
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* @param[out] pu1_mv_bits
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* length of the codeword for all mv's
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*
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* @remarks The length of the code words are derived from signed exponential
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* goloumb codes.
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*
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*******************************************************************************
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*/
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void ih264e_init_mv_bits(me_ctxt_t *ps_me);
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/**
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*******************************************************************************
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*
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* @brief The function computes the parameters for a P skip MB
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*
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* @par Description:
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* The function computes the parameters for a P skip MB
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*
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* @param[in] ps_proc
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* Process context
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*
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* @param[in] u4_for_me
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* Flag to indicate the purpose of computing skip
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*
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* @param[out] ps_pred_mv
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* Flag to indicate the current active refernce list
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*
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* @returns
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* 1) Updates skip MV in proc
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* 2) Returns if the current MB can be coded as skip or not
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*
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* @remarks The code implements the logic as described in sec 8.4.1.1 in H264
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* specification.
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*
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*******************************************************************************
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*/
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ih264e_skip_params_ft ih264e_find_pskip_params;
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/**
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*******************************************************************************
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*
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* @brief The function computes the parameters for a P skip MB
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*
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* @par Description:
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* The function computes the parameters for a P skip MB
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*
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* @param[in] ps_proc
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* Process context
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*
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* @param[in] u4_for_me
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* Flag to indicate the purpose of computing skip
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*
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* @param[out] ps_pred_mv
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* Flag to indicate the current active refernce list
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*
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* @returns
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* 1) Updates skip MV in proc
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* 2) Returns if the current MB can be coded as skip or not
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*
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* @remarks The code implements the logic as described in sec 8.4.1.1 in H264
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* specification.
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*
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*******************************************************************************
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*/
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ih264e_skip_params_ft ih264e_find_pskip_params_me;
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/**
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*******************************************************************************
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*
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* @brief The function computes the parameters for a B skip MB
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*
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* @par Description:
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* The function computes the parameters for a B skip MB
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*
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* @param[in] ps_proc
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* Process context
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*
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* @param[in] u4_for_me
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* Flag to indicate the purpose of computing skip
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*
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* @param[out] ps_pred_mv
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* Flag to indicate the current active refernce list
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*
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* @returns
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* 1) Updates skip MV in proc
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* 2) Returns if the current MB can be coded as skip or not
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*
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* @remarks The code implements the logic as described in sec 8.4.1.1 in H264
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* specification.
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*
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*******************************************************************************
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*/
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ih264e_skip_params_ft ih264e_find_bskip_params;
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/**
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*******************************************************************************
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*
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* @brief The function computes the parameters for a B skip MB
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*
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* @par Description:
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* The function computes the parameters for a B skip MB
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*
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* @param[in] ps_proc
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* Process context
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*
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* @param[in] u4_for_me
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* Flag to indicate the purpose of computing skip
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*
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* @param[out] ps_pred_mv
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* Flag to indicate the current active refernce list
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*
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* @returns
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* 1) Updates skip MV in proc
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* 2) The type of SKIP [L0/L1/BI]
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*
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* @remarks
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*******************************************************************************
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*/
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ih264e_skip_params_ft ih264e_find_bskip_params_me;
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/**
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*******************************************************************************
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*
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* @brief motion vector predictor
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*
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* @par Description:
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* The routine calculates the motion vector predictor for a given block,
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* given the candidate MV predictors.
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*
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* @param[in] ps_left_mb_pu
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* pointer to left mb motion vector info
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*
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* @param[in] ps_top_row_pu
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* pointer to top & top right mb motion vector info
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*
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* @param[out] ps_pred_mv
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* pointer to candidate predictors for the current block
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*
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* @returns The x & y components of the MV predictor.
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*
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* @remarks The code implements the logic as described in sec 8.4.1.3 in H264
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* specification.
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* Assumptions : 1. Assumes Only partition of size 16x16
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*
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*******************************************************************************
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*/
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void ih264e_get_mv_predictor(enc_pu_t *ps_left_mb_pu, enc_pu_t *ps_top_row_pu,
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enc_pu_mv_t *ps_pred_mv, WORD32 i4_ref_list);
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/**
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*******************************************************************************
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*
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* @brief This fucntion evalues ME for 2 reference lists
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*
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* @par Description:
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* It evaluates skip, full-pel an half-pel and assigns the correct MV in proc
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*
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* @param[in] ps_proc
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* Process context corresponding to the job
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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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ih264e_compute_me_ft ih264e_compute_me_multi_reflist;
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/**
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*******************************************************************************
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*
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* @brief This fucntion evalues ME for single reflist [Pred L0]
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*
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* @par Description:
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* It evaluates skip, full-pel an half-pel and assigns the correct MV in proc
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*
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* @param[in] ps_proc
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* Process context corresponding to the job
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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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ih264e_compute_me_ft ih264e_compute_me_single_reflist;
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/**
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*******************************************************************************
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*
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* @brief This function initializes me ctxt
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*
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* @par Description:
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* Before dispatching the current job to me thread, the me context associated
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* with the job is initialized.
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*
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* @param[in] ps_proc
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* Process context corresponding to the job
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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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void ih264e_init_me(process_ctxt_t *ps_proc);
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/**
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*******************************************************************************
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*
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* @brief This function performs motion estimation for the current NMB
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*
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* @par Description:
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* Intializes input and output pointers required by the function ih264e_compute_me
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* and calls the function ih264e_compute_me in a loop to process NMBs.
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*
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* @param[in] ps_proc
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* Process context corresponding to the job
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*
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* @returns
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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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void ih264e_compute_me_nmb(process_ctxt_t *ps_proc, UWORD32 u4_nmb_count);
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/**
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*******************************************************************************
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*
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* @brief This function performs MV prediction
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*
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* @par Description:
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*
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* @param[in] ps_proc
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* Process context corresponding to the job
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*
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* @returns none
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*
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* @remarks none
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* This function will update the MB availability since intra inter decision
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* should be done before the call
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*
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*******************************************************************************
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*/
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void ih264e_mv_pred(process_ctxt_t *ps_proc, WORD32 i4_reflist);
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/**
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*******************************************************************************
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*
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* @brief This function approximates Pred. MV
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*
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* @par Description:
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*
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* @param[in] ps_proc
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* Process context corresponding to the job
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*
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* @returns none
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*
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* @remarks none
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* Motion estimation happens at nmb level. For cost calculations, mv is appro
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* ximated using this function
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*
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*******************************************************************************
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*/
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void ih264e_mv_pred_me(process_ctxt_t *ps_proc, WORD32 i4_ref_list);
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#endif /* IH264E_ME_H_ */
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