Re: MIDI (was Re: [Denemo-devel] Anacrusis script needed)

[Jeremiah Benham]

Here is an attempt to implement what you were suggesting Richard. I am
having troubles with it. I repeatedly gives note on events and then
crashes denemo for some reason. 

void
jack_playpitch(gint key, gint duration, gint volume, gint channel){
 if (!BufferReady){
   AllSoundOff=TRUE;
 }
 if (BufferReady){
    loop_index = 0;
    global_midi_buffer[0] = NOTE_ON;
    global_midi_buffer[1] = key; //freq
    global_midi_buffer[2] = volume;
    global_duration = duration;
    BufferReady=FALSE;
  }
}

static void
send_midi_event(jack_nframes_t nframes){
  unsigned char *buffer;
  gint i=0;
  gint channel;
  void *port_buffers[MAX_NUMBER_OF_TRACKS];
  if (AllSoundOff){
    for (channel=0;channel<16;channel++){
      buffer = jack_midi_event_reserve(port_buffers[i], 0, 3);
      buffer[0] = MIDI_CONTROLLER | channel;
      buffer[1] = MIDI_ALL_NOTE_OFF;
      buffer[2] = 0;
      global_duration = loop_index = 0;
      AllSoundOff=FALSE;
    }
  }

  if (!BufferReady)
   if (output_ports[i]){
     port_buffers[i] = jack_port_get_buffer(output_ports[i], nframes);
     jack_midi_clear_buffer(port_buffers[i]);
     buffer = jack_midi_event_reserve(port_buffers[i], 0, 3);
     buffer[0] = global_midi_buffer[0];
     buffer[1] = global_midi_buffer[1];
     buffer[2] = global_midi_buffer[2];
     BufferReady=TRUE;
   }
}

static void
timer_callback(jack_nframes_t nframes){
  gint i;
  for (i=0;i<nframes;i++)
    if (global_duration != 0){
      if ((loop_index++ >= global_duration) && BufferReady){
       global_midi_buffer[0] = NOTE_OFF;
       /*global_midi_buffer[1] = same*/
       global_midi_buffer[2] = 0;
       BufferReady=FALSE;
       global_duration = loop_index = 0;
      }   
      if ((loop_index > global_duration) && !BufferReady){
        global_duration = loop_index = 0;
        AllSoundOff=TRUE;
      }
    }
}

Also in process_callback I put this:
if (Denemo.gui->si && output_ports && Denemo.prefs.immediateplayback){
          send_midi_event(nframes);
          timer_callback(nframes);
        }


Thanks for your help,
Jeremiah