46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 Michael Sevakis (jhMikeS)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#if !SPC_NOECHO
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#define SPC_DSP_ECHO_APPLY
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enum
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{
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FIR_BUF_CNT = FIR_BUF_HALF,
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FIR_BUF_SIZE = FIR_BUF_CNT * sizeof ( int32_t ),
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FIR_BUF_ALIGN = FIR_BUF_SIZE * 2,
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FIR_BUF_MASK = ~((FIR_BUF_ALIGN / 2) | (sizeof ( int32_t ) - 1))
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};
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/* Echo filter structure embedded in struct Spc_Dsp */
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struct echo_filter
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{
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/* FIR history is interleaved. Hardware handles wrapping by mask.
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* |LR|LR|LR|LR|LR|LR|LR|LR| */
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int32_t* ptr;
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/* wrapped address just behind current position -
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allows mac.w to increment and mask ptr */
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int32_t* hist_ptr;
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/* copy of echo FIR constants as int16_t for use with mac.w */
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int16_t coeff [VOICE_COUNT];
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};
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#endif /* !SPC_NOECHO */
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