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main process: provisional decoding of midi messages

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This commit is contained in:
Michael Sippel 2024-12-08 19:36:31 +01:00
parent 847af03dc7
commit 804e1cb738
Signed by: senvas
GPG key ID: F96CF119C34B64A6
2 changed files with 31 additions and 9 deletions
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2
delay.c
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@ -8,7 +8,7 @@ void delay_init(
struct delay * delay
) {
delay->mix = 0.8;
delay->feedback = 0.6;
delay->feedback = 0.8;
delay->duration = 0;
delay->buf_idx = 0;
delay->buf_capacity = 0;

38
guitfx.c
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@ -75,15 +75,37 @@ static void on_process(void *userdata, struct spa_io_position *position)
char * midi_data = SPA_POD_BODY(&c->value);
unsigned size = SPA_POD_BODY_SIZE(&c->value);
uint64_t cur_tap = frame + c->offset;
uint64_t duration = cur_tap - data->last_tap;
data->last_tap = cur_tap;
printf("duration = %lu\n", duration);
if( duration < (4*position->clock.rate.denom) ) {
delay_set_time( &data->delay, duration );
}
printf("[%d] MIDI message (%d bytes) : %x, %x, %x\n", sec, size, midi_data[0], midi_data[1], midi_data[2]);
switch( midi_data[0] & 0xff ) {
case 0xb0:
switch( midi_data[1] ) {
case 0x0b:
// expr pedal
float val_f = ((float)midi_data[2]) / 128.0;
printf("Expr Pedal %f\n", val_f);
data->delay.mix = val_f;
break;
case 0x42:
// sust pedal
uint64_t cur_tap = frame + c->offset;
uint64_t duration = cur_tap - data->last_tap;
data->last_tap = cur_tap;
if( duration < (4*position->clock.rate.denom) ) {
delay_set_time( &data->delay, duration/4 );
}
break;
}
break;
case 0xc0:
// program change
printf("program change: %u\n", midi_data[1]);
break;
}
} else {
printf("on_process(): non midi-control\n");
}