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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
* ih264e_me.h
*
* @brief
* Contains declarations of global variables for H264 encoder
*
* @author
* ittiam
*
* @remarks
*
*******************************************************************************
*/
#ifndef IH264E_ME_H_
#define IH264E_ME_H_
/*****************************************************************************/
/* Function Macros */
/*****************************************************************************/
/**
******************************************************************************
* @brief compute median of 3 elements (a, b, c) and store the output
* in to result. This is used for mv prediction
******************************************************************************
*/
#define MEDIAN(a, b, c, result) if (a > b){\
if (b > c)\
result = b;\
else {\
if (a > c)\
result = c;\
else \
result = a;\
}\
}\
else {\
if (c > b)\
result = b;\
else {\
if (c > a)\
result = c;\
else \
result = a;\
}\
}
/*****************************************************************************/
/* Extern Function Declarations */
/*****************************************************************************/
/**
*******************************************************************************
*
* @brief
* This function populates the length of the codewords for motion vectors in the
* range (-search range, search range) in pixels
*
* @param[in] ps_me
* Pointer to me ctxt
*
* @param[out] pu1_mv_bits
* length of the codeword for all mv's
*
* @remarks The length of the code words are derived from signed exponential
* goloumb codes.
*
*******************************************************************************
*/
void ih264e_init_mv_bits
(
me_ctxt_t *ps_me
);
/**
*******************************************************************************
*
* @brief The function gives the skip motion vector
*
* @par Description:
* The function gives the skip motion vector
*
* @param[in] ps_left_mb_pu
* pointer to left mb motion vector info
*
* @param[in] ps_top_row_pu
* pointer to top & top right mb motion vector info
*
* @param[out] ps_pred_mv
* pointer to candidate predictors for the current block
*
* @returns The x & y components of the MV predictor.
*
* @remarks The code implements the logic as described in sec 8.4.1.1 in H264
* specification.
*
*******************************************************************************
*/
void ih264e_find_skip_motion_vector
(
process_ctxt_t *ps_proc,
UWORD32 u4_for_me
);
/**
*******************************************************************************
*
* @brief motion vector predictor
*
* @par Description:
* The routine calculates the motion vector predictor for a given block,
* given the candidate MV predictors.
*
* @param[in] ps_left_mb_pu
* pointer to left mb motion vector info
*
* @param[in] ps_top_row_pu
* pointer to top & top right mb motion vector info
*
* @param[out] ps_pred_mv
* pointer to candidate predictors for the current block
*
* @returns The x & y components of the MV predictor.
*
* @remarks The code implements the logic as described in sec 8.4.1.3 in H264
* specification.
* Assumptions : 1. Assumes Single reference frame
* 2. Assumes Only partition of size 16x16
*
*******************************************************************************
*/
void ih264e_get_mv_predictor
(
enc_pu_t *ps_left_mb_pu,
enc_pu_t *ps_top_row_pu,
mv_t *ps_pred_mv
);
/**
*******************************************************************************
*
* @brief This function computes the best motion vector for the current mb
*
* @par Description:
* This function currently does nothing except set motion vectors from external
* source
*
* @param[in] ps_proc
* Process context corresponding to the job
*
* @returns none
*
* @remarks none
*
*******************************************************************************
*/
void ih264e_compute_me
(
process_ctxt_t *ps_proc
);
/**
*******************************************************************************
*
* @brief This function initializes me ctxt
*
* @par Description:
* Before dispatching the current job to me thread, the me context associated
* with the job is initialized.
*
* @param[in] ps_proc
* Process context corresponding to the job
*
* @returns none
*
* @remarks none
*
*******************************************************************************
*/
void ih264e_init_me(process_ctxt_t *ps_proc);
/**
*******************************************************************************
*
* @brief This function performs motion estimation for the current NMB
*
* @par Description:
* Intializes input and output pointers required by the function ih264e_compute_me
* and calls the function ih264e_compute_me in a loop to process NMBs.
*
* @param[in] ps_proc
* Process context corresponding to the job
*
* @returns
*
* @remarks none
*
*******************************************************************************
*/
void ih264e_compute_me_nmb
(
process_ctxt_t *ps_proc,
UWORD32 u4_nmb_count
);
/**
*******************************************************************************
*
* @brief This function performs MV prediction
*
* @par Description:
*
* @param[in] ps_proc
* Process context corresponding to the job
*
* @returns none
*
* @remarks none
* This function will update the MB availability since intra inter decision
* should be done before the call
*
*******************************************************************************
*/
void ih264e_mv_pred
(
process_ctxt_t *ps_proc
);
/**
*******************************************************************************
*
* @brief This function approximates Pred. MV
*
* @par Description:
*
* @param[in] ps_proc
* Process context corresponding to the job
*
* @returns none
*
* @remarks none
* Motion estimation happens at nmb level. For cost calculations, mv is appro
* ximated using this function
*
*******************************************************************************
*/
void ih264e_mv_pred_me
(
process_ctxt_t *ps_proc
);
#endif /* IH264E_ME_H_ */
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