1 /****************************************************************************** 2 * 3 * Copyright (C) 2015 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 #ifndef _EST_SAD_H_ 22 #define _EST_SAD_H_ 23 24 /* 25 * "est_sad_t->i4_use_est_intra_sad" Flag to control how the I frame SAD is estimated. 26 * If set to zero 27 * - it uses the Intra sad calculated by the previous P frame as 28 * the estimated sad for the current I frame 29 * else 30 * - it uses the ratio of P frame sads of the previous two GOPS and 31 * scales the I Frame sad with this ratio to estimate the current 32 * I frame SAD 33 */ 34 35 /* Estimating the Average SAD for the current picture type is done by: 36 * 1) if picture_type is I 37 * - Estimated SAD = (n-1)th intra frame interval(ifi) P frame Avg SAD * 38 * ( prev I frame SAD / (n-2)nd intra frame interval(ifi) P frame Avg SAD) 39 * - if only one IFI is encoded use the previous I frame SAD 40 * 2) if picture type is P 41 * - Estimate SAD is previous P frame SAD 42 * 3) The first P frame in a IFI could use a little better logic to decide the 43 * estimated SAD but currently we assume the last coded P frames SAD 44 a*/ 45 46 typedef struct est_sad_t *est_sad_handle; 47 48 WORD32 irc_est_sad_num_fill_use_free_memtab(est_sad_handle *est_sad, 49 itt_memtab_t *ps_memtab, 50 ITT_FUNC_TYPE_E e_func_type); 51 52 void irc_init_est_sad(est_sad_handle est_sad, WORD32 i4_use_est_frame_sad); 53 54 UWORD32 irc_get_est_sad(est_sad_handle est_sad, picture_type_e e_pic_type); 55 56 void irc_update_actual_sad(est_sad_handle est_sad, 57 UWORD32 u4_actual_sad, 58 picture_type_e e_pic_type); 59 60 void irc_update_actual_sad_for_intra(est_sad_handle est_sad, 61 WORD32 i4_intra_frm_cost); 62 63 void irc_reset_est_sad(est_sad_handle ps_est_sad); 64 #endif 65