1 /****************************************************************************** 2 * 3 * Copyright (C) 2018 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ***************************************************************************** 18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore 19 */ 20 /*! 21 ****************************************************************************** 22 * \file est_sad.h 23 * 24 * \brief 25 * This file contain SAD estimation functions declarations 26 * 27 * \date 28 * 29 * \author 30 * ittiam 31 * 32 ****************************************************************************** 33 */ 34 35 #ifndef _EST_SAD_H_ 36 #define _EST_SAD_H_ 37 38 /* "est_sad_t->i4_use_est_intra_sad" Flag to control how the I frame SAD is estimated. 39 If set to zero 40 - it uses the Intra sad calculated by the previous P frame as 41 the estimated sad for the current I frame 42 else 43 - it uses the ratio of P frame sads of the previous two GOPS and 44 scales the I Frame sad with this ratio to estimate the current 45 I frame SAD 46 */ 47 48 /* Estimating the Average SAD for the current picture type is done by: 49 1) if picture_type is I 50 - Estimated SAD = (n-1)th intra frame interval(ifi) P frame Avg SAD * 51 ( prev I frame SAD / (n-2)nd intra frame interval(ifi) P frame Avg SAD) 52 - if only one IFI is encoded use the previous I frame SAD 53 2) if picture type is P 54 - Estimate SAD is previous P frame SAD 55 3) The first P frame in a IFI could use a little better logic to decide the 56 estimated SAD but currently we assume the last coded P frames SAD */ 57 58 /*****************************************************************************/ 59 /* Structure */ 60 /*****************************************************************************/ 61 typedef struct est_sad_t *est_sad_handle; 62 63 /*****************************************************************************/ 64 /* Function Declarations */ 65 /*****************************************************************************/ 66 WORD32 est_sad_num_fill_use_free_memtab( 67 est_sad_handle *est_sad, itt_memtab_t *ps_memtab, ITT_FUNC_TYPE_E e_func_type); 68 69 void init_est_sad(est_sad_handle est_sad, WORD32 i4_use_est_frame_sad); 70 71 UWORD32 get_est_sad(est_sad_handle est_sad, picture_type_e e_pic_type); 72 73 void update_actual_sad(est_sad_handle est_sad, UWORD32 u4_actual_sad, picture_type_e e_pic_type); 74 75 void update_actual_sad_for_intra(est_sad_handle est_sad, WORD32 i4_intra_frm_cost); 76 77 void update_prev_frame_intra_sad(est_sad_handle ps_est_sad, WORD32 i4_intra_frm_sad); 78 79 WORD32 get_prev_frame_intra_sad(est_sad_handle ps_est_sad); 80 81 void update_prev_frame_sad(est_sad_handle ps_est_sad, WORD32 i4_frm_sad, picture_type_e e_pic_type); 82 83 WORD32 get_prev_frame_sad(est_sad_handle ps_est_sad, picture_type_e e_pic_type); 84 85 void reset_est_sad(est_sad_handle ps_est_sad); 86 87 WORD32 update_ppic_sad(est_sad_handle est_sad, WORD32 i4_est_sad, WORD32 i4_prev_p_sad); 88 #endif 89