46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
|
/***************************************************************************
|
||
|
* __________ __ ___.
|
||
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
||
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
||
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
||
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
||
|
* \/ \/ \/ \/ \/
|
||
|
* $Id$
|
||
|
*
|
||
|
* Copyright (C) 2010 Michael Sevakis (jhMikeS)
|
||
|
*
|
||
|
* This program is free software; you can redistribute it and/or
|
||
|
* modify it under the terms of the GNU General Public License
|
||
|
* as published by the Free Software Foundation; either version 2
|
||
|
* of the License, or (at your option) any later version.
|
||
|
*
|
||
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
||
|
* KIND, either express or implied.
|
||
|
*
|
||
|
****************************************************************************/
|
||
|
#if !SPC_NOECHO
|
||
|
|
||
|
#define SPC_DSP_ECHO_APPLY
|
||
|
|
||
|
enum
|
||
|
{
|
||
|
FIR_BUF_CNT = FIR_BUF_HALF * 2,
|
||
|
FIR_BUF_SIZE = FIR_BUF_CNT * sizeof ( int32_t ),
|
||
|
FIR_BUF_ALIGN = FIR_BUF_SIZE,
|
||
|
FIR_BUF_MASK = ~((FIR_BUF_ALIGN / 2) | (sizeof ( int32_t ) - 1))
|
||
|
};
|
||
|
|
||
|
/* Echo filter structure embedded in struct Spc_Dsp */
|
||
|
struct echo_filter
|
||
|
{ /* fir_buf [i + 8] == fir_buf [i], to avoid wrap checking in FIR code */
|
||
|
int32_t* ptr;
|
||
|
/* FIR history is interleaved with guard to eliminate wrap checking
|
||
|
* when convolving.
|
||
|
* |LR|LR|LR|LR|LR|LR|LR|LR|--|--|--|--|--|--|--|--| */
|
||
|
/* copy of echo FIR constants as int16_t, loaded as int32 for
|
||
|
* halfword, packed multiples */
|
||
|
int16_t coeff [VOICE_COUNT];
|
||
|
};
|
||
|
|
||
|
#endif /* SPC_NOECHO */
|