mirror of https://github.com/ZDoom/fluidsynth.git
164 lines
4.1 KiB
C
164 lines
4.1 KiB
C
/* FluidSynth Metronome - Sequencer API example
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*
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* This code is in the public domain.
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*
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* To compile:
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* gcc -o fluidsynth_metronome -lfluidsynth fluidsynth_metronome.c
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*
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* To run:
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* fluidsynth_metronome soundfont [beats [tempo]]
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*
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* [Pedro Lopez-Cabanillas <plcl@users.sf.net>]
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <fluidsynth.h>
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fluid_synth_t *synth;
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fluid_audio_driver_t *audiodriver;
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fluid_sequencer_t *sequencer;
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short synth_destination, client_destination;
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unsigned int time_marker;
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/* default tempo, beats per minute */
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#define TEMPO 120
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unsigned int note_duration = 60000 / TEMPO;
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/* metronome click/bell */
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unsigned int weak_note = 33;
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unsigned int strong_note = 34;
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/* number of notes in one pattern */
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unsigned int pattern_size = 4;
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/* prototype */
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void
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sequencer_callback(unsigned int time, fluid_event_t *event,
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fluid_sequencer_t *seq, void *data);
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/* schedule a note on message */
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void
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schedule_noteon(int chan, short key, unsigned int ticks)
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{
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fluid_event_t *ev = new_fluid_event();
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fluid_event_set_source(ev, -1);
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fluid_event_set_dest(ev, synth_destination);
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fluid_event_noteon(ev, chan, key, 127);
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fluid_sequencer_send_at(sequencer, ev, ticks, 1);
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delete_fluid_event(ev);
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}
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/* schedule a timer event (shall trigger the callback) */
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void
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schedule_timer_event()
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{
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fluid_event_t *ev = new_fluid_event();
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fluid_event_set_source(ev, -1);
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fluid_event_set_dest(ev, client_destination);
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fluid_event_timer(ev, NULL);
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fluid_sequencer_send_at(sequencer, ev, time_marker, 1);
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delete_fluid_event(ev);
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}
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/* schedule the metronome pattern */
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void
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schedule_pattern()
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{
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int i, note_time;
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note_time = time_marker;
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for(i = 0; i < pattern_size; ++i)
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{
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schedule_noteon(9, i ? weak_note : strong_note, note_time);
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note_time += note_duration;
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}
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time_marker = note_time;
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}
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void
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sequencer_callback(unsigned int time, fluid_event_t *event,
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fluid_sequencer_t *seq, void *data)
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{
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schedule_timer_event();
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schedule_pattern();
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}
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void
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usage(char *prog_name)
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{
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printf("Usage: %s soundfont.sf2 [beats [tempo]]\n", prog_name);
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printf("\t(optional) beats: number of pattern beats, default %d\n",
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pattern_size);
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printf("\t(optional) tempo: BPM (Beats Per Minute), default %d\n", TEMPO);
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}
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int
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main(int argc, char *argv[])
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{
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int n;
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fluid_settings_t *settings;
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settings = new_fluid_settings();
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if(argc < 2)
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{
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usage(argv[0]);
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}
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else
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{
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/* create the synth, driver and sequencer instances */
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synth = new_fluid_synth(settings);
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/* load a SoundFont */
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n = fluid_synth_sfload(synth, argv[1], 1);
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if(n != -1)
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{
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sequencer = new_fluid_sequencer();
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/* register the synth with the sequencer */
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synth_destination = fluid_sequencer_register_fluidsynth(sequencer,
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synth);
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/* register the client name and callback */
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client_destination = fluid_sequencer_register_client(sequencer,
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"fluidsynth_metronome", sequencer_callback, NULL);
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audiodriver = new_fluid_audio_driver(settings, synth);
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if(argc > 2)
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{
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n = atoi(argv[2]);
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if(n > 0)
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{
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pattern_size = n;
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}
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}
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if(argc > 3)
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{
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n = atoi(argv[3]);
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if(n > 0)
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{
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note_duration = 60000 / n;
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}
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}
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/* get the current time in ticks */
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time_marker = fluid_sequencer_get_tick(sequencer);
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/* schedule patterns */
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schedule_pattern();
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schedule_timer_event();
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schedule_pattern();
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/* wait for user input */
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printf("press <Enter> to stop\n");
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n = getchar();
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}
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/* clean and exit */
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delete_fluid_audio_driver(audiodriver);
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delete_fluid_sequencer(sequencer);
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delete_fluid_synth(synth);
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}
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delete_fluid_settings(settings);
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return 0;
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}
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