Loading and playing MIDI files

If you only want to load and play MIDI files you can use the AdvancedSequencer class.

It is an all-in-one object easy to use and with all the common features of a sequencer. These include:

• Loading MIDI files
• Playing and stopping the file at any time
• Jumping from a time to another, even when playing
• Muting, soloing, transposing, velocity scaling for individual tracks
• MIDI out port assign and time shifting for individual tracks
• Global tempo scaling
• Embeds a MIDIThru object, so you can play along with the sequencer

Here is a simple example of its usage:

#include "advancedsequencer.h"
#include "timer.h"                      // for Wait()
 
int main() {
   AdvancedSequencer seq;               // creates the AdvancedSequencer
   seq.Load("twinkle.mid");             // loads a MIDI file into it
   seq.Play();                          // plays the file
   while (seq.IsPlaying())              // waits until the end (the sequencer auto stops)
      MIDITimer::Wait(10);              // 10 msecs
   return 0;
}

Here is a more complex example using some of the class features (in a real environment you could do these commands interactively) while the sequencer is playing:

#include "advancedsequencer.h"
#include "timer.h"                      // for Wait()
 
int main() {
   AdvancedSequencer seq;               // creates the AdvancedSequencer
   seq.Load("twinkle.mid");             // loads a MIDI file into it
   seq.Play();                          // plays the file
   while(seq.GetCurrentMeasure() < 4)   // waits until measure 4
      MIDITimer::Wait(10);              // 10 msecs
   seq.SetTrackTranspose(1, 12);        // transposes track 1 by one octave up
   while(seq.GetCurrentMeasure() < 8)
      MIDITimer::Wait(10);
   seq.SetTrackMute(1, true);          // mutes track 1
   while(seq.GetCurrentMeasure() < 12)
      MIDITimer::Wait(10);
   seq.SetTrackSolo(2);                 // soloes track 2 ...
   seq.SetTempoScale(200);              // ... and doubles the tempo
   while(seq.IsPlaying()                // waits until the end
      MIDITimer::Wait(10);
   return 0;
}

You can see two more elaborated examples that let you interact with the class:

• test_advancedsequencer.cpp command line based, for all platforms, demonstrates all the main features of the class.
• test_win32_player.cpp GUI based, for Windows only, demonstrates the use of a MIDISequencerGUINotifier and a SMPTE together with the AdvancedSequencer.