/////////////////////////////////////////////////////////////////////////////
// called when a MIDI event should be played at a given tick
/////////////////////////////////////////////////////////////////////////////
static s32 SEQ_PlayEvent(u8 track, mios32_midi_package_t midi_package, u32 tick)
{
// ignore all events in silent mode (for SEQ_SongPos function)
// we could implement a more intelligent parser, which stores the sent CC/program change, etc...
// and sends the last received values before restarting the song...
if( ffwd_silent_mode )
return 0;
seq_midi_out_event_type_t event_type = SEQ_MIDI_OUT_OnEvent;
if( midi_package.event == NoteOff || (midi_package.event == NoteOn && midi_package.velocity == 0) )
event_type = SEQ_MIDI_OUT_OffEvent;
// output events on DEFAULT port
u32 status = 0;
status |= SEQ_MIDI_OUT_Send(DEFAULT, midi_package, event_type, tick, 0);
return status;
}
/////////////////////////////////////////////////////////////////////////////
// performs a single bpm tick
/////////////////////////////////////////////////////////////////////////////
static s32 SEQ_Tick(u32 bpm_tick)
{
// whenever we reach a new 16th note (96 ticks @384 ppqn):
if( (bpm_tick % (SEQ_BPM_PPQN_Get()/4)) == 0 ) {
// ensure that arp is reseted on first bpm_tick
if( bpm_tick == 0 )
arp_counter = 0;
else {
// increment arpeggiator counter
++arp_counter;
// reset once we reached length of notestack
if( arp_counter >= notestack.len )
arp_counter = 0;
}
if( notestack.len > 0 ) {
// get note/velocity/length from notestack
u8 note = notestack_items[arp_counter].note;
u8 velocity = notestack_items[arp_counter].tag;
u8 length = 72; // always the same, could be varied, e.g. via CC
// put note into queue if all values are != 0
if( note && velocity && length ) {
mios32_midi_package_t midi_package;
midi_package.type = NoteOn; // package type must match with event!
midi_package.event = NoteOn;
midi_package.chn = Chn1;
midi_package.note = note;
midi_package.velocity = velocity;
SEQ_MIDI_OUT_Send(DEFAULT, midi_package, SEQ_MIDI_OUT_OnOffEvent, bpm_tick, length);
}
}
}
return 0; // no error
}
/////////////////////////////////////////////////////////////////////////////
// called when a Meta event should be played/processed at a given tick
/////////////////////////////////////////////////////////////////////////////
static s32 SEQ_PlayMeta(u8 track, u8 meta, u32 len, u8 *buffer, u32 tick)
{
switch( meta ) {
case 0x00: // Sequence Number
if( len == 2 ) {
u32 seq_number = (buffer[0] << 8) | buffer[1];
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Sequence Number %u\n", track, tick, seq_number);
#endif
} else {
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Sequence Number with %d bytes -- ERROR: expecting 2 bytes!\n", track, tick, len);
#endif
}
break;
case 0x01: // Text Event
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Text: %s\n", track, tick, buffer);
#endif
break;
case 0x02: // Copyright Notice
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Copyright: %s\n", track, tick, buffer);
#endif
break;
case 0x03: // Sequence/Track Name
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Track Name: %s\n", track, tick, buffer);
#endif
break;
case 0x04: // Instrument Name
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Instr. Name: %s\n", track, tick, buffer);
#endif
break;
case 0x05: // Lyric
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Lyric: %s\n", track, tick, buffer);
#endif
break;
case 0x06: // Marker
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Marker: %s\n", track, tick, buffer);
#endif
break;
case 0x07: // Cue Point
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Cue Point: %s\n", track, tick, buffer);
#endif
break;
case 0x20: // Channel Prefix
if( len == 1 ) {
u32 prefix = *buffer;
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Channel Prefix %u\n", track, tick, prefix);
#endif
} else {
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Channel Prefix with %d bytes -- ERROR: expecting 1 byte!\n", track, tick, len);
#endif
}
break;
case 0x2f: // End of Track
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - End of Track\n", track, tick, meta);
#endif
break;
case 0x51: // Set Tempo
if( len == 3 ) {
u32 tempo_us = (buffer[0] << 16) | (buffer[1] << 8) | buffer[2];
float bpm = 60.0 * (1E6 / (float)tempo_us);
SEQ_BPM_PPQN_Set(MIDI_PARSER_PPQN_Get());
// set tempo immediately on first tick
if( tick == 0 ) {
SEQ_BPM_Set(bpm);
} else {
// put tempo change request into the queue
mios32_midi_package_t tempo_package; // or Softis?
tempo_package.ALL = (u32)bpm;
SEQ_MIDI_OUT_Send(DEFAULT, tempo_package, SEQ_MIDI_OUT_TempoEvent, tick, 0);
}
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Tempo to %u uS -> %u BPM\n", track, tick, tempo_us, (u32)bpm);
#endif
} else {
#if DEBUG_VERBOSE_LEVEL >= 2
DEBUG_MSG("[SEQ:%d:%u] Meta - Tempo with %u bytes -- ERROR: expecting 3 bytes!\n", track, tick, len);
#endif
}
break;
// other known events which are not handled here:
// 0x54: SMPTE offset
// 0x58: Time Signature
// 0x59: Key Signature
// 0x7f: Sequencer Specific Meta Event
#if DEBUG_VERBOSE_LEVEL >= 2
default:
DEBUG_MSG("[SEQ:%d:%u] Meta Event 0x%02x with length %u not processed\n", track, tick, meta, len);
#endif
}
return 0;
}
