static void Play(MIDI_MusicTrack *tracks, unsigned int nofTracks) {
int itemNo;
uint8_t channel;
uint32_t currTimeMs;
TickType_t startTicks;
unsigned int nofFinished;
/* init defaults */
for(channel=0;channel<nofTracks;channel++) {
VS1_MIDI_SetBank(channel, 0);
VS1_MIDI_SetInstrument(channel, VS1_MIDI_INSTR_Default);
VS1_MIDI_SetVolume(channel, 127);
}
startTicks = FRTOS1_xTaskGetTickCount();
itemNo = 0;
for(;;) { /* breaks */
currTimeMs = (FRTOS1_xTaskGetTickCount()-startTicks)/portTICK_RATE_MS;
#if 0
if (currTimeMs>15000) {
break;
}
#endif
nofFinished = 0;
for(channel=0;channel<nofTracks;channel++) {
if (!PlayTrackItem(&tracks[channel], currTimeMs, channel)) {
nofFinished++;
}
}
if (nofFinished==nofTracks) { /* all finished */
break;
}
FRTOS1_vTaskDelay(1/portTICK_RATE_MS);
itemNo++;
}
}
static bool PlayTrackItem(MIDI_MusicTrack *track, unsigned int currTimeMs, uint8_t channel) {
uint32_t beatsPerSecond = 2; /* 120 bpm */
uint32_t currentMillis;
uint32_t ppqn; /* ticks per beat/quarter note */
uint32_t tempo = 110;
uint8_t event;
unsigned int itemNo;
ppqn = track->nofTicksPerQuarterNote;
for(;;) { /* breaks */
itemNo = track->currLine;
if (itemNo>=track->nofLines) { /* out of list */
return FALSE; /* do not continue any more */
}
currentMillis = ((uint32_t)track->lines[itemNo].beat*1000UL)/beatsPerSecond;
currentMillis += ((uint32_t)track->lines[itemNo].tick*60000UL)/ppqn/tempo;
if (currentMillis>currTimeMs) {
return TRUE; /* continue */
}
event = track->lines[itemNo].event;
switch(event) {
case MIDI_BANK:
VS1_MIDI_SetBank(channel, track->lines[itemNo].val1);
break;
case MIDI_NOTE_ON:
if (track->lines[itemNo].val2==0) { /* note on with velocity zero is a note off */
VS1_MIDI_NoteOff(channel, track->lines[itemNo].val1, 0);
} else {
VS1_MIDI_NoteOn(channel, track->lines[itemNo].val1, track->lines[itemNo].val2);
}
break;
case MIDI_NOTE_OFF:
VS1_MIDI_NoteOff(channel, track->lines[itemNo].val1, track->lines[itemNo].val2);
break;
case MIDI_PATCH:
VS1_MIDI_SetInstrument(channel, track->lines[itemNo].val1);
break;
case MIDI_VOLUME:
VS1_MIDI_SetVolume(channel, track->lines[itemNo].val1);
break;
case MIDI_PAN:
VS1_MIDI_SetPan(channel, track->lines[itemNo].val1);
break;
case MIDI_END_OF_TRACK:
VS1_MIDI_AllSoundOff(channel);
break;
}
track->currLine++;
} /* for */
return TRUE;
}
static void PlayMIDI(void) {
int instrument, note;
VS1_MIDI_SetBank(0, 0);
for(instrument=0; instrument<127; instrument++) {
VS1_MIDI_SetInstrument(0, instrument);
for(note=30; note<40; note++) {
VS1_MIDI_NoteOn(0, note, 127);
FRTOS1_vTaskDelay(200/portTICK_RATE_MS);
VS1_MIDI_NoteOff(0, note, 127);
FRTOS1_vTaskDelay(50/portTICK_RATE_MS);
}
FRTOS1_vTaskDelay(100/portTICK_RATE_MS);
}
}
