/****************************************************************************** * * 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 computes the parameters for a P skip MB * * @par Description: * The function computes the parameters for a P skip MB * * @param[in] ps_proc * Process context * * @param[in] u4_for_me * Flag to indicate the purpose of computing skip * * @param[out] ps_pred_mv * Flag to indicate the current active refernce list * * @returns * 1) Updates skip MV in proc * 2) Returns if the current MB can be coded as skip or not * * @remarks The code implements the logic as described in sec 8.4.1.1 in H264 * specification. * ******************************************************************************* */ ih264e_skip_params_ft ih264e_find_pskip_params; /** ******************************************************************************* * * @brief The function computes the parameters for a P skip MB * * @par Description: * The function computes the parameters for a P skip MB * * @param[in] ps_proc * Process context * * @param[in] u4_for_me * Flag to indicate the purpose of computing skip * * @param[out] ps_pred_mv * Flag to indicate the current active refernce list * * @returns * 1) Updates skip MV in proc * 2) Returns if the current MB can be coded as skip or not * * @remarks The code implements the logic as described in sec 8.4.1.1 in H264 * specification. * ******************************************************************************* */ ih264e_skip_params_ft ih264e_find_pskip_params_me; /** ******************************************************************************* * * @brief The function computes the parameters for a B skip MB * * @par Description: * The function computes the parameters for a B skip MB * * @param[in] ps_proc * Process context * * @param[in] u4_for_me * Flag to indicate the purpose of computing skip * * @param[out] ps_pred_mv * Flag to indicate the current active refernce list * * @returns * 1) Updates skip MV in proc * 2) Returns if the current MB can be coded as skip or not * * @remarks The code implements the logic as described in sec 8.4.1.1 in H264 * specification. * ******************************************************************************* */ ih264e_skip_params_ft ih264e_find_bskip_params; /** ******************************************************************************* * * @brief The function computes the parameters for a B skip MB * * @par Description: * The function computes the parameters for a B skip MB * * @param[in] ps_proc * Process context * * @param[in] u4_for_me * Flag to indicate the purpose of computing skip * * @param[out] ps_pred_mv * Flag to indicate the current active refernce list * * @returns * 1) Updates skip MV in proc * 2) The type of SKIP [L0/L1/BI] * * @remarks ******************************************************************************* */ ih264e_skip_params_ft ih264e_find_bskip_params_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 Only partition of size 16x16 * ******************************************************************************* */ void ih264e_get_mv_predictor(enc_pu_t *ps_left_mb_pu, enc_pu_t *ps_top_row_pu, enc_pu_mv_t *ps_pred_mv, WORD32 i4_ref_list); /** ******************************************************************************* * * @brief This fucntion evalues ME for 2 reference lists * * @par Description: * It evaluates skip, full-pel an half-pel and assigns the correct MV in proc * * @param[in] ps_proc * Process context corresponding to the job * * @returns none * * @remarks none * ******************************************************************************* */ ih264e_compute_me_ft ih264e_compute_me_multi_reflist; /** ******************************************************************************* * * @brief This fucntion evalues ME for single reflist [Pred L0] * * @par Description: * It evaluates skip, full-pel an half-pel and assigns the correct MV in proc * * @param[in] ps_proc * Process context corresponding to the job * * @returns none * * @remarks none * ******************************************************************************* */ ih264e_compute_me_ft ih264e_compute_me_single_reflist; /** ******************************************************************************* * * @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, WORD32 i4_reflist); /** ******************************************************************************* * * @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, WORD32 i4_ref_list); #endif /* IH264E_ME_H_ */