ios - Get midi sequence (MusicSequence) markers generates with Logic -

i'm developing app play midi sequence (.mid) audio units. midi file created logic offers possibility add markers on timeline.

in code, use musicsequence musicplayer read file, , midiclientcreate mididestinationcreate parse midi packets.

the principal method

    osstatus result = noerr;   // initialise music sequence newmusicsequence(&_s);  // string path of midi file // should located in resources folder nsstring *midifilepath = [[nsbundle mainbundle]                           pathforresource:@"mymidifile"                           oftype:@"mid"];  // create new url points midi file nsurl * midifileurl = [nsurl fileurlwithpath:midifilepath];  // load file musicsequencefileload(_s, (__bridge cfurlref) midifileurl, 0, 0);    // initialise music player newmusicplayer(&_p);   // load sound exs file [self loadfromexs:@"grand piano" withsampler:_samplerunit];  //load click [self loadfromsoundfont:@"hit set" withsampler:_samplerunit2];   //assign channel tracks musictrack track = null; musictrack track2 = null; musicsequencegetindtrack(_s, 1, &track); musicsequencegetindtrack(_s, 2, &track2);  //assign tracks audio units musictracksetdestnode(track, _samplernode); musictracksetdestnode(track2, _samplernode2);   // create client result = midiclientcreate(cfstr("virtual client"),mymidinotifyproc,(__bridge void *)(self),&_virtualmidi); nsassert( result == noerr, @"midiclientcreate failed. error code: %d '%.4s'", (int) result, (const char *)&result);   // create endpoint result = mididestinationcreate(_virtualmidi, (cfstringref)@"virtual destination", mymidireadproc, (__bridge void *)(self), &_virtualendpoint);  nsassert( result == noerr, @"mididestinationcreate failed. error code: %d '%.4s'", (int) result, (const char *)&result);   // ************* set endpoint of sequence our virtual endpoint musicsequencesetmidiendpoint(_s, _virtualendpoint);     // load sequence music player musicplayersetsequence(_p, _s); // called musicplayer setup. // reduces latency when musicplayerstart called musicplayerpreroll(_p); // starts music playing musicplayerstart(_p); 

and readproc function

void mymidireadproc(const midipacketlist *pktlist,                 audioprocessor *refcon,                 void *connrefcon) {   audiounit *player = nil;  midipacket *packet = (midipacket *)pktlist->packet; nsstring *messagetype;  (int i=0; < pktlist->numpackets; i++) {       byte midistatus = packet->data[0];     byte midicommand = midistatus >> 4;// mask off top 4 bits     byte note = packet->data[1] & 0x7f;     byte velocity = packet->data[2] & 0x7f;      // find channel masking off low 4 bits     nsinteger midichannel = midistatus & 0x0f;       switch (midistatus & 0xf0) {         case 0x80:             messagetype = @"note off";             break;          case 0x90:             messagetype = @"note on";             break;          case 0xa0:             messagetype = @"aftertouch";             break;          case 0xb0:             messagetype = @"control change";             break;          case 0xc0:             messagetype = @"program change";             break;          case 0xd0:             messagetype = @"channel pressure";             break;          case 0xe0:             messagetype = @"pitch wheel";             break;          default:             messagetype = @"unk";             break;     }     nslog(@"%@",messagetype);     int notenumber = ((int) note) % 12;     nsstring *notetype;     switch (notenumber) {         case 0:             notetype = @"c";             break;         case 1:             notetype = @"c#/db";             break;         case 2:             notetype = @"d";             break;         case 3:             notetype = @"d#/eb";             break;         case 4:             notetype = @"e";             break;         case 5:             notetype = @"f";             break;         case 6:             notetype = @"f#/gb";             break;         case 7:             notetype = @"g";             break;         case 8:             notetype = @"g#/ab";             break;         case 9:             notetype = @"a";             break;         case 10:             notetype = @"a#/bb";             break;         case 11:             notetype = @"b";             break;         default:             break;     }         if( velocity == 0 ){          uint32 noteoff =    kmidimessage_noteoff << 4 | 0;         if( midichannel == 0 ){             musicdevicemidievent (refcon.samplerunit, noteoff, note, 0, 0);         }else if( midichannel == 1 ){             musicdevicemidievent (refcon.samplerunit2, noteoff, note, 0, 0);         }      }else{          if( midichannel == 0 ){             musicdevicemidievent (refcon.samplerunit, midistatus, note, velocity, 0);         }else if( midichannel == 1 ){             musicdevicemidievent (refcon.samplerunit2, midistatus, note, velocity, 0);         }      }      packet = midipacketnext(packet); } 

}

with readproc function, can see midi messages not markers...

if reopen midi file in logic, markers in file, where... how can in code ?

markers contained in midi file marker meta events. need extend parsing support meta events. meta events have status 0xff. markers next byte 0x06, length , number of characters.