/*************************************************************************** * __________ __ ___. * 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 */