dbc223eb84
Import existing source tree; original VCS history is no longer available. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/*(LGPL)
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---------------------------------------------------------------------------
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a_control.c - Group/Channel/Voice Control Implementation
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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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/*
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* The control routing model:
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*
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* Group
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* ^ |
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* | V
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* MIDI -> Channel -> Patch ---> Voice
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* | |-> Voice
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* V ... ...
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* Bus Control '-> Voice
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*
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* Groups are used by Channels, to transform some of the control
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* data sent to them, before passing it on to the current Patch.
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* That is, they would effectively fit in in between Channels
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* and Patches, from the data flow POV.
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*
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* Note that while Groups act as passive data containers most of
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* the time, they *can* become active, and force Channels to
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* refresh some Controls. This can happen when changing the
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* "music volume" in an application, for example.
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FIXME: What about busses with non-linear insert effects? Looks like
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FIXME: at least *some* Group Controls should not be applied on the
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FIXME: Channel or Patch level, but rather on the Busses... Maybe
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FIXME: Busses should have 'group' fields? That way, one can still
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FIXME: use them as with the current design, although for example
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FIXME: ACC_VOLUME would be sent off to the bus send that acts as
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FIXME: master volume for all Voices of the Group.
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FIXME: Then again, this may result in general confusion! It's
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FIXME: theoretically possible to select busses on a *per-Voice
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FIXME: basis* (via Patches), and quite easy to select busses
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FIXME: directly using MIDI CCs. Good bye to application control
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FIXME: over the mixing...!
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FIXME: The only simple solution I can see is to prevent sending
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FIXME: between busses across group boundaries.
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*/
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#include "a_globals.h"
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#include "a_control.h"
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#include "a_tools.h"
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const int addtrans_min[2] = { -65536, 0 };
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const int addtrans_max[2] = { 65536, 128<<16 };
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const int addtrans_bias[2] = { 0, 60<<16 };
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/*----------------------------------------------------------
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Group Control
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----------------------------------------------------------*/
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void acc_group_set(unsigned gid, unsigned ctl, int arg)
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{
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int i;
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audio_group_t *g = grouptab + gid;
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g->ctl[ctl] = arg;
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if(!_audio_running)
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return;
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/* Update all channels of the group */
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for(i = 0; i < AUDIO_MAX_CHANNELS; ++i)
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{
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audio_channel_t *c = channeltab + i;
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if((unsigned)c->ctl[ACC_GROUP] != gid)
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continue;
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(void)ce_control_i(c, 0, -1, ctl, c->rctl[ctl]);
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}
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}
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static int _is_open = 0;
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void audio_group_open(void)
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{
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int i;
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if(_is_open)
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return;
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memset(grouptab, 0, sizeof(grouptab));
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for(i = 0; i < AUDIO_MAX_GROUPS; ++i)
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acc_copya(&grouptab[i].ctl, &a_group_def_ctl);
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_is_open = 1;
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}
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void audio_group_close(void)
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{
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if(!_is_open)
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return;
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memset(grouptab, 0, sizeof(grouptab));
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_is_open = 0;
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}
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