Home | History | Annotate | Download | only in drc_src 
      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 #include <stdio.h>
     21 #include <math.h>
     22 
     23 #include "impd_type_def.h"
     24 #include "impd_drc_extr_delta_coded_info.h"
     25 #include "impd_drc_common.h"
     26 #include "impd_drc_struct.h"
     27 #include "impd_drc_filter_bank.h"
     28 #include "impd_drc_rom.h"
     29 
     30 WORD32 impd_init_tbls(const WORD32 num_gain_max_values,
     31                       ia_tables_struct* str_tables) {
     32   impd_gen_delta_time_code_tbl(num_gain_max_values,
     33                                str_tables->delta_time_code_table);
     34   return (0);
     35 }
     36 
     37 void impd_get_delta_gain_code_tbl(
     38     const WORD32 gain_coding_profile,
     39     ia_delta_gain_code_table_struct const** delta_time_code_tbl,
     40     WORD32* num_entries) {
     41   if (gain_coding_profile == GAIN_CODING_PROFILE_CLIPPING) {
     42     *delta_time_code_tbl = ia_drc_gain_tbls_prof_2;
     43     *num_entries = NUM_GAIN_TBL_PROF_2_ENTRIES;
     44   } else {
     45     *delta_time_code_tbl = ia_drc_gain_tbls_prof_0_1;
     46     *num_entries = NUM_GAIN_TBL_PROF_0_1_ENTRIES;
     47   }
     48 }
     49 
     50 void impd_gen_delta_time_code_tbl(
     51     const WORD32 num_gain_max_values,
     52     ia_delta_time_code_table_entry_struct* delta_time_code_tbl_item) {
     53   WORD32 n, k;
     54 
     55   WORD32 Z = 1;
     56   while ((1 << Z) < 2 * num_gain_max_values) {
     57     Z++;
     58   }
     59 
     60   delta_time_code_tbl_item[0].size = -1;
     61   delta_time_code_tbl_item[0].code = -1;
     62   delta_time_code_tbl_item[0].value = -1;
     63 
     64   delta_time_code_tbl_item[1].size = 2;
     65   delta_time_code_tbl_item[1].code = 0x0;
     66   delta_time_code_tbl_item[1].value = 1;
     67   for (n = 0; n < 4; n++) {
     68     delta_time_code_tbl_item[n + 2].size = 4;
     69     delta_time_code_tbl_item[n + 2].code = 0x4 + n;
     70     delta_time_code_tbl_item[n + 2].value = n + 2;
     71   }
     72   for (n = 0; n < 8; n++) {
     73     delta_time_code_tbl_item[n + 6].size = 5;
     74     delta_time_code_tbl_item[n + 6].code = 0x10 + n;
     75     delta_time_code_tbl_item[n + 6].value = n + 6;
     76   }
     77 
     78   k = 2 * num_gain_max_values - 14 + 1;
     79   for (n = 0; n < k; n++) {
     80     delta_time_code_tbl_item[n + 14].size = 2 + Z;
     81     delta_time_code_tbl_item[n + 14].code = (0x3 << Z) + n;
     82     delta_time_code_tbl_item[n + 14].value = n + 14;
     83   }
     84 }
     85 
     86 WORD32
     87 impd_get_delta_tmin(const WORD32 sampling_rate) {
     88   WORD32 lowerBound = (WORD32)(0.5f + 0.0005f * sampling_rate);
     89   WORD32 result = 1;
     90   if (sampling_rate < 1000) {
     91     return (UNEXPECTED_ERROR);
     92   }
     93   while (result <= lowerBound) result = result << 1;
     94   return result;
     95 }
     96