mirror of https://github.com/tasks/tasks
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
2.7 KiB
C
73 lines
2.7 KiB
C
/*
|
|
** 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 */
|