| Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 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 |