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/*
** Copyright 2003-2010, VisualOn, Inc.
**
** 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.
*/
/*******************************************************************************
File: block_switch.h
Content: Block switching structure and functions
*******************************************************************************/
#ifndef _BLOCK_SWITCH_H
#define _BLOCK_SWITCH_H
#include "typedef.h"
/****************** Defines ******************************/
#define BLOCK_SWITCHING_IIR_LEN 2 /* Length of HighPass-FIR-Filter for Attack-Detection */
#define BLOCK_SWITCH_WINDOWS TRANS_FAC /* number of windows for energy calculation */
#define BLOCK_SWITCH_WINDOW_LEN FRAME_LEN_SHORT /* minimal granularity of energy calculation */
/****************** Structures ***************************/
typedef struct{
Word32 invAttackRatio;
Word16 windowSequence;
Word16 nextwindowSequence;
Flag attack;
Flag lastattack;
Word16 attackIndex;
Word16 lastAttackIndex;
Word16 noOfGroups;
Word16 groupLen[TRANS_FAC];
Word32 windowNrg[2][BLOCK_SWITCH_WINDOWS]; /* time signal energy in Subwindows (last and current) */
Word32 windowNrgF[2][BLOCK_SWITCH_WINDOWS]; /* filtered time signal energy in segments (last and current) */
Word32 iirStates[BLOCK_SWITCHING_IIR_LEN]; /* filter delay-line */
Word32 maxWindowNrg; /* max energy in subwindows */
Word32 accWindowNrg; /* recursively accumulated windowNrgF */
}BLOCK_SWITCHING_CONTROL;
Word16 InitBlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl,
const Word32 bitRate, const Word16 nChannels);
Word16 BlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControl,
Word16 *timeSignal,
Word32 sampleRate,
Word16 chIncrement);
Word16 SyncBlockSwitching(BLOCK_SWITCHING_CONTROL *blockSwitchingControlLeft,
BLOCK_SWITCHING_CONTROL *blockSwitchingControlRight,
const Word16 noOfChannels);
#endif /* #ifndef _BLOCK_SWITCH_H */
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