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/******************************************************************************
* *
* Copyright (C) 2023 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
*/
#pragma once
#define BLOCK_SWITCH_WINDOWS TRANS_FAC /* number of windows for energy calculation */
#define BLOCK_SWITCH_WINDOW_LEN \
FRAME_LEN_SHORT_128 /* minimal granularity of energy calculation */
#define BLK_SWITCH_WIN 8
#define BLK_SWITCH_FILT_LEN 2
/* Block types */
#define LONG_WINDOW 0
#define START_WINDOW 1
#define SHORT_WINDOW 2
#define STOP_WINDOW 3
/* Window shapes */
#define SINE_WINDOW 0
#define KBD_WINDOW 1
#define MAXIMUM_NO_OF_GROUPS 4
#define ACC_WINDOW_NRG_FAC 0.3f
#define ONE_MINUS_ACC_WINDOW_NRG_FAC 0.7f
#define INV_ATTACK_RATIO_HIGH_BR 0.1f
#define INV_ATTACK_RATIO_LOW_BR 0.056f
#define MIN_ATTACK_NRG (1000000)
#define BLK_SWITCH_HIGH_BR_MONO (24000)
#define BLK_SWITCH_HIGH_BR_STEREO (16000)
typedef struct {
FLOAT32 inv_attack_ratio;
WORD32 win_seq;
WORD32 nxt_win_seq;
WORD32 attack;
WORD32 lastattack;
WORD32 attack_idx;
WORD32 last_attack_idx;
WORD32 total_groups_cnt;
WORD32 group_len[TRANS_FAC];
FLOAT32 win_energy[BLK_SWITCH_FILT_LEN][BLK_SWITCH_WIN];
FLOAT32 win_energy_filt[BLK_SWITCH_FILT_LEN][BLK_SWITCH_WIN];
FLOAT32 iir_states[BLK_SWITCH_FILT_LEN];
FLOAT32 max_win_energy;
FLOAT32 acc_win_energy;
WORD32 win_seq_ld; /* these are used to save window decision for LD. */
WORD32 next_win_seq_ld; /* nxt_win_seq and win_seq are always set to
LONG_WINDOW */
} ixheaace_block_switch_control;
VOID iaace_init_block_switching(ixheaace_block_switch_control *pstr_blk_switch_ctrl,
const WORD32 bit_rate, const WORD32 num_chans);
VOID iaace_block_switching(ixheaace_block_switch_control *pstr_blk_switch_ctrl,
const FLOAT32 *ptr_time_signal, WORD32 frame_length, WORD32 num_chans);
VOID iaace_sync_block_switching(ixheaace_block_switch_control *pstr_blk_switch_left_ctrl,
ixheaace_block_switch_control *pstr_blk_switch_right_ctrl,
const WORD32 num_channels);