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/*(LGPL)
---------------------------------------------------------------------------
a_sequencer.c - MIDI Sequencer
---------------------------------------------------------------------------
* Copyright (C) 2002, David Olofson
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "a_globals.h"
#include "a_struct.h"
#include "a_sequencer.h"
#include "a_midisock.h"
/*
* Temporary MIDI playback hack.
*
* Only one sequence at a time, and it uses the
* same midisock as the external MIDI input.
*/
midi_player_t *midiplayer = 0;
static float fs = 44100;
int sequencer_open(midisock_t *ms, float framerate)
{
aev_client("sequencer_open()");
fs = framerate;
#if 1
midiplayer = mp_open(ms);
#else
midiplayer = mp_open(&monitor_midisock);
#endif
return (midiplayer != 0);
}
void sequencer_close(void)
{
aev_client("sequencer_close()");
if(!midiplayer)
return;
mp_close(midiplayer);
midiplayer = 0;
}
int sequencer_play(midi_file_t *mf, int tag, int pitch, int volume)
{
aev_client("sequencer_play()");
if(!midiplayer)
return -1;
midiplayer->pitch = pitch - (60 << 16);
mp_select(midiplayer, mf);
return 0;
}
void sequencer_stop(int tag)
{
aev_client("sequencer_stop()");
if(!midiplayer)
return;
mp_stop(midiplayer);
}
int sequencer_playing(int tag)
{
if(!midiplayer)
return 0;
return (midiplayer->mf != 0);
}
void sequencer_process(unsigned frames)
{
int i;
aev_client("sequencer_process()");
if(!midiplayer)
return;
if(mp_play(midiplayer, (float)frames / fs))
return;
for(i = 0; i < AUDIO_MAX_CHANNELS; ++i)
{
int wave;
if(!channeltab[i].playing)
continue;
wave = patchtab[channeltab[i].ctl[ACC_PATCH]].param[APP_WAVE];
if((wave < 0) || (wave >= AUDIO_MAX_WAVES))
continue;
if(AF_MIDI != wavetab[wave].format)
continue;
channeltab[i].playing = 0;
}
}
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