common/JackMidiBufferReadQueue.cpp

   1 /*
   2 Copyright (C) 2010 Devin Anderson
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU Lesser General Public License as published by
   6 the Free Software Foundation; either version 2.1 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU Lesser General Public License for more details.
  13
  14 You should have received a copy of the GNU Lesser General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 */
  19
  20 #include "JackMidiBufferReadQueue.h"
  21 #include "JackMidiUtil.h"
  22 #include "JackError.h"
  23
  24 using Jack::JackMidiBufferReadQueue;
  25
  26 JackMidiBufferReadQueue::JackMidiBufferReadQueue()
  27 {
  28     event_count = 0;
  29     index = 0;
  30 }
  31
  32 jack_midi_event_t *
  33 JackMidiBufferReadQueue::DequeueEvent()
  34 {
  35     jack_midi_event_t *e = 0;
  36     if (index < event_count) {
  37         JackMidiEvent *event = &(buffer->events[index]);
  38         midi_event.buffer = event->GetData(buffer);
  39         midi_event.size = event->size;
  40         midi_event.time = last_frame_time + event->time;
  41         e = &midi_event;
  42         index++;
  43     }
  44     return e;
  45 }
  46
  47 void
  48 JackMidiBufferReadQueue::ResetMidiBuffer(JackMidiBuffer *buffer)
  49 {
  50     event_count = 0;
  51     index = 0;
  52     if (! buffer) {
  53         jack_error("JackMidiBufferReadQueue::ResetMidiBuffer - buffer reset "
  54                    "to NULL");
  55     } else if (! buffer->IsValid()) {
  56         jack_error("JackMidiBufferReadQueue::ResetMidiBuffer - buffer reset "
  57                    "to invalid buffer");
  58     } else {
  59         uint32_t lost_events = buffer->lost_events;
  60         if (lost_events) {
  61             jack_error("JackMidiBufferReadQueue::ResetMidiBuffer - %d events "
  62                        "lost during mixdown", lost_events);
  63         }
  64         this->buffer = buffer;
  65         event_count = buffer->event_count;
  66         last_frame_time = GetLastFrame();
  67     }
  68 }