78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
/******************************************************************************
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* *
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#pragma once
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#define BLOCK_SWITCH_WINDOWS TRANS_FAC /* number of windows for energy calculation */
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#define BLOCK_SWITCH_WINDOW_LEN \
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FRAME_LEN_SHORT_128 /* minimal granularity of energy calculation */
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#define BLK_SWITCH_WIN 8
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#define BLK_SWITCH_FILT_LEN 2
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/* Block types */
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#define LONG_WINDOW 0
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#define START_WINDOW 1
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#define SHORT_WINDOW 2
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#define STOP_WINDOW 3
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/* Window shapes */
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#define SINE_WINDOW 0
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#define KBD_WINDOW 1
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#define MAXIMUM_NO_OF_GROUPS 4
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#define ACC_WINDOW_NRG_FAC 0.3f
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#define ONE_MINUS_ACC_WINDOW_NRG_FAC 0.7f
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#define INV_ATTACK_RATIO_HIGH_BR 0.1f
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#define INV_ATTACK_RATIO_LOW_BR 0.056f
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#define MIN_ATTACK_NRG (1000000)
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#define BLK_SWITCH_HIGH_BR_MONO (24000)
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#define BLK_SWITCH_HIGH_BR_STEREO (16000)
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typedef struct {
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FLOAT32 inv_attack_ratio;
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WORD32 win_seq;
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WORD32 nxt_win_seq;
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WORD32 attack;
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WORD32 lastattack;
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WORD32 attack_idx;
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WORD32 last_attack_idx;
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WORD32 total_groups_cnt;
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WORD32 group_len[TRANS_FAC];
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FLOAT32 win_energy[BLK_SWITCH_FILT_LEN][BLK_SWITCH_WIN];
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FLOAT32 win_energy_filt[BLK_SWITCH_FILT_LEN][BLK_SWITCH_WIN];
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FLOAT32 iir_states[BLK_SWITCH_FILT_LEN];
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FLOAT32 max_win_energy;
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FLOAT32 acc_win_energy;
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WORD32 win_seq_ld; /* these are used to save window decision for LD. */
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WORD32 next_win_seq_ld; /* nxt_win_seq and win_seq are always set to
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LONG_WINDOW */
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} ixheaace_block_switch_control;
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VOID iaace_init_block_switching(ixheaace_block_switch_control *pstr_blk_switch_ctrl,
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const WORD32 bit_rate, const WORD32 num_chans);
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VOID iaace_block_switching(ixheaace_block_switch_control *pstr_blk_switch_ctrl,
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const FLOAT32 *ptr_time_signal, WORD32 frame_length, WORD32 num_chans);
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VOID iaace_sync_block_switching(ixheaace_block_switch_control *pstr_blk_switch_left_ctrl,
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ixheaace_block_switch_control *pstr_blk_switch_right_ctrl,
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const WORD32 num_channels);
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