dbc223eb84
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100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*(LGPL)
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---------------------------------------------------------------------------
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a_patch.h - Audio Engine "instrument" definitions
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---------------------------------------------------------------------------
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* Copyright (C) 2001, 2002, David Olofson
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _A_PATCH_H_
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#define _A_PATCH_H_
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#include "a_globals.h"
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#include "a_types.h"
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#include "a_events.h"
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#include "eel.h"
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/*----------------------------------------------------------
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Audio Patch
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----------------------------------------------------------*/
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struct audio_channel_t;
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typedef struct audio_patch_t
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{
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appbank_t param;
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/*
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* Process input events, update internal state and
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* generate output events for 'frames' frames.
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*
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* IMPORTANT!
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* The engine may occasionally call this
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* function with a 0 'frames' argument. This
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* doesn't mean "do nothing", but rather
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* "process all events available for the
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* first frame". (It's used whenever the
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* engine needs to split for an ACC_PATCH
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* while there are more events for the
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* same frame.)
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*/
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void (*process)(struct audio_patch_t *p,
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struct audio_channel_t *c, unsigned frames);
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eel_symbol_t *eel_process;
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} audio_patch_t;
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typedef enum
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{
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PES_START = 0,
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PES_START2,
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PES_DELAY,
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PES_ATTACK,
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PES_HOLD,
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PES_DECAY,
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PES_SUSTAIN,
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PES_WAIT,
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PES_RELEASE,
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PES_DEAD
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} A_patch_env_states;
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/*
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* Temporary kludge. Something more flexible will probably
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* be needed, but I'm using this for now, to avoid type
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* casting void pointers all over the place. (Not an issue
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* with EEL based patches.)
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*/
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typedef struct patch_closure_t
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{
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/* Arguments from CE_START */
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int velocity;
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int pitch; /* w/ RANDPITCH, but w/o channel PITCH */
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int velvol; /* For envelope */
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/* Envelope generator state */
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A_patch_env_states env_state;
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int queued_stop;
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aev_timestamp_t env_next;
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int lvol, rvol;
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int lsend, rsend;
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} patch_closure_t;
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void audio_patch_open(void);
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void audio_patch_close(void);
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#endif /*_A_PATCH_H_*/
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