prosperon/source/engine/music.c

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#include "music.h"
#include "dsp.h"
#include "tsf.h"
#include "tml.h"
#include "mix.h"
#include "sound.h"
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#define TSF_BLOCK 32
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struct dsp_filter cursong;
struct dsp_midi_song gsong;
void dsp_midi_fillbuf(struct dsp_midi_song *song, void *out, int n)
{
short *o = (short*)out;
tml_message *midi = song->midi;
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for (int i = 0; i < n; i += TSF_BLOCK) {
while (midi && song->time >= midi->time) {
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switch (midi->type)
{
case TML_PROGRAM_CHANGE:
tsf_channel_set_presetnumber(song->sf, midi->channel, midi->program, (midi->channel == 9));
break;
case TML_NOTE_ON:
tsf_channel_note_on(song->sf, midi->channel, midi->key, midi->velocity / 127.f);
break;
case TML_NOTE_OFF:
tsf_channel_note_off(song->sf, midi->channel, midi->key);
break;
case TML_PITCH_BEND:
tsf_channel_set_pitchwheel(song->sf, midi->channel, midi->pitch_bend);
break;
case TML_CONTROL_CHANGE:
tsf_channel_midi_control(song->sf, midi->channel, midi->control, midi->control_value);
break;
}
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midi = midi->next;
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}
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tsf_render_short(song->sf, o, TSF_BLOCK, 0);
o += TSF_BLOCK*2;
song->time += TSF_BLOCK * (1000.f/SAMPLERATE);
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}
song->midi = midi;
}
void play_song(const char *midi, const char *sf)
{
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gsong.midi = tml_load_filename("sounds/stickerbrush.mid");
gsong.sf = tsf_load_filename("sounds/ff7.sf2");
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gsong.time = 0.f;
tsf_set_output(gsong.sf, TSF_STEREO_INTERLEAVED, SAMPLERATE, 0.f);
// Preset on 10th MIDI channel to use percussion sound bank if possible
tsf_channel_set_bank_preset(gsong.sf, 9, 128, 0);
cursong.data = &gsong;
cursong.filter = dsp_midi_fillbuf;
first_free_bus(cursong);
}