linux/firewire/JackFFADOMidiSendQueue.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 <cassert>
  21
  22 #include "JackFFADOMidiSendQueue.h"
  23 #include "JackMidiUtil.h"
  24
  25 using Jack::JackFFADOMidiSendQueue;
  26
  27 JackFFADOMidiSendQueue::JackFFADOMidiSendQueue()
  28 {
  29     // Empty
  30 }
  31
  32 Jack::JackMidiWriteQueue::EnqueueResult
  33 JackFFADOMidiSendQueue::EnqueueEvent(jack_nframes_t time, size_t size,
  34                                      jack_midi_data_t *buffer)
  35 {
  36     assert(size == 1);
  37     jack_nframes_t relative_time = (time < last_frame) ? 0 : time - last_frame;
  38     if (index < relative_time) {
  39         index = (relative_time % 8) ?
  40             (relative_time & (~ ((jack_nframes_t) 7))) + 8 : relative_time;
  41     }
  42     if (index >= length) {
  43         return BUFFER_FULL;
  44     }
  45     output_buffer[index] = 0x01000000 | ((uint32_t) *buffer);
  46     index += 8;
  47     return OK;
  48 }
  49
  50 jack_nframes_t
  51 JackFFADOMidiSendQueue::GetNextScheduleFrame()
  52 {
  53     return last_frame + index;
  54 }
  55
  56 void
  57 JackFFADOMidiSendQueue::ResetOutputBuffer(uint32_t *output_buffer,
  58                                           jack_nframes_t length)
  59 {
  60     index = 0;
  61     last_frame = GetLastFrame();
  62     this->length = length;
  63     this->output_buffer = output_buffer;
  64 }