common/JackMidiBufferWriteQueue.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 "JackMidiBufferWriteQueue.h"
  21 #include "JackMidiUtil.h"
  22 #include "JackError.h"
  23
  24 using Jack::JackMidiBufferWriteQueue;
  25
  26 JackMidiBufferWriteQueue::JackMidiBufferWriteQueue()
  27 {
  28     // Empty
  29 }
  30
  31 Jack::JackMidiWriteQueue::EnqueueResult
  32 JackMidiBufferWriteQueue::EnqueueEvent(jack_nframes_t time, size_t size,
  33                                        jack_midi_data_t *data)
  34 {
  35     if (time >= next_frame_time) {
  36         return EVENT_EARLY;
  37     }
  38     if (time < last_frame_time) {
  39         time = last_frame_time;
  40     }
  41     jack_midi_data_t *dst = buffer->ReserveEvent(time - last_frame_time, size);
  42     if (! dst) {
  43         return size > max_bytes ? BUFFER_TOO_SMALL : BUFFER_FULL;
  44     }
  45     memcpy(dst, data, size);
  46     return OK;
  47 }
  48
  49 void
  50 JackMidiBufferWriteQueue::ResetMidiBuffer(JackMidiBuffer *buffer,
  51                                           jack_nframes_t frames)
  52 {
  53     if (! buffer) {
  54         jack_error("JackMidiBufferWriteQueue::ResetMidiBuffer - buffer reset "
  55                    "to NULL");
  56     } else if (! buffer->IsValid()) {
  57         jack_error("JackMidiBufferWriteQueue::ResetMidiBuffer - buffer reset "
  58                    "to invalid buffer");
  59     } else {
  60         this->buffer = buffer;
  61         buffer->Reset(frames);
  62         last_frame_time = GetLastFrame();
  63         max_bytes = buffer->MaxEventSize();
  64         next_frame_time = last_frame_time + frames;
  65     }
  66 }