dbc223eb84
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117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/*(LGPL)
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---------------------------------------------------------------------------
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a_sequencer.c - MIDI Sequencer
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---------------------------------------------------------------------------
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* Copyright (C) 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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#include "a_globals.h"
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#include "a_struct.h"
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#include "a_sequencer.h"
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#include "a_midisock.h"
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/*
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* Temporary MIDI playback hack.
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*
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* Only one sequence at a time, and it uses the
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* same midisock as the external MIDI input.
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*/
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midi_player_t *midiplayer = 0;
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static float fs = 44100;
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int sequencer_open(midisock_t *ms, float framerate)
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{
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aev_client("sequencer_open()");
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fs = framerate;
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#if 1
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midiplayer = mp_open(ms);
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#else
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midiplayer = mp_open(&monitor_midisock);
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#endif
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return (midiplayer != 0);
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}
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void sequencer_close(void)
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{
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aev_client("sequencer_close()");
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if(!midiplayer)
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return;
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mp_close(midiplayer);
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midiplayer = 0;
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}
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int sequencer_play(midi_file_t *mf, int tag, int pitch, int volume)
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{
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aev_client("sequencer_play()");
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if(!midiplayer)
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return -1;
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midiplayer->pitch = pitch - (60 << 16);
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mp_select(midiplayer, mf);
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return 0;
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}
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void sequencer_stop(int tag)
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{
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aev_client("sequencer_stop()");
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if(!midiplayer)
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return;
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mp_stop(midiplayer);
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}
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int sequencer_playing(int tag)
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{
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if(!midiplayer)
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return 0;
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return (midiplayer->mf != 0);
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}
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void sequencer_process(unsigned frames)
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{
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int i;
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aev_client("sequencer_process()");
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if(!midiplayer)
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return;
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if(mp_play(midiplayer, (float)frames / fs))
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return;
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for(i = 0; i < AUDIO_MAX_CHANNELS; ++i)
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{
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int wave;
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if(!channeltab[i].playing)
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continue;
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wave = patchtab[channeltab[i].ctl[ACC_PATCH]].param[APP_WAVE];
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if((wave < 0) || (wave >= AUDIO_MAX_WAVES))
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continue;
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if(AF_MIDI != wavetab[wave].format)
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continue;
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channeltab[i].playing = 0;
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}
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}
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