Jack2 1.9.10

JackFFADOMidiOutputPort.cpp

00001 /*
00002 Copyright (C) 2010 Devin Anderson
00003 
00004 This program is free software; you can redistribute it and/or modify
00005 it under the terms of the GNU Lesser General Public License as published by
00006 the Free Software Foundation; either version 2.1 of the License, or
00007 (at your option) any later version.
00008 
00009 This program is distributed in the hope that it will be useful,
00010 but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 GNU Lesser General Public License for more details.
00013 
00014 You should have received a copy of the GNU Lesser General Public License
00015 along with this program; if not, write to the Free Software
00016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017 
00018 */
00019 
00020 #include <memory>
00021 
00022 #include "JackFFADOMidiOutputPort.h"
00023 #include "JackMidiUtil.h"
00024 #include "JackError.h"
00025 
00026 using Jack::JackFFADOMidiOutputPort;
00027 
00028 JackFFADOMidiOutputPort::JackFFADOMidiOutputPort(size_t non_rt_size,
00029                                                  size_t max_non_rt_messages,
00030                                                  size_t max_rt_messages)
00031 {
00032     event = 0;
00033     read_queue = new JackMidiBufferReadQueue();
00034     std::auto_ptr<JackMidiBufferReadQueue> read_queue_ptr(read_queue);
00035     send_queue = new JackFFADOMidiSendQueue();
00036     std::auto_ptr<JackFFADOMidiSendQueue> send_queue_ptr(send_queue);
00037     raw_queue = new JackMidiRawOutputWriteQueue(send_queue, non_rt_size,
00038                                                 max_non_rt_messages,
00039                                                 max_rt_messages);
00040     send_queue_ptr.release();
00041     read_queue_ptr.release();
00042 }
00043 
00044 JackFFADOMidiOutputPort::~JackFFADOMidiOutputPort()
00045 {
00046     delete raw_queue;
00047     delete read_queue;
00048     delete send_queue;
00049 }
00050 
00051 void
00052 JackFFADOMidiOutputPort::Process(JackMidiBuffer *port_buffer,
00053                                  uint32_t *output_buffer,
00054                                  jack_nframes_t frames)
00055 {
00056     read_queue->ResetMidiBuffer(port_buffer);
00057     send_queue->ResetOutputBuffer(output_buffer, frames);
00058     jack_nframes_t boundary_frame = GetLastFrame() + frames;
00059     if (! event) {
00060         event = read_queue->DequeueEvent();
00061     }
00062     for (; event; event = read_queue->DequeueEvent()) {
00063         switch (raw_queue->EnqueueEvent(event)) {
00064         case JackMidiWriteQueue::BUFFER_FULL:
00065 
00066             // Processing events early might free up some space in the raw
00067             // output queue.
00068 
00069             raw_queue->Process(boundary_frame);
00070             switch (raw_queue->EnqueueEvent(event)) {
00071             case JackMidiWriteQueue::BUFFER_TOO_SMALL:
00072                 // This shouldn't really happen.  It indicates a bug if it
00073                 // does.
00074                 jack_error("JackFFADOMidiOutputPort::Process - **BUG** "
00075                            "JackMidiRawOutputWriteQueue::EnqueueEvent "
00076                            "returned `BUFFER_FULL`, and then returned "
00077                            "`BUFFER_TOO_SMALL` after a `Process()` call.");
00078                 // Fallthrough on purpose
00079             case JackMidiWriteQueue::OK:
00080                 continue;
00081             default:
00082                 return;
00083             }
00084         case JackMidiWriteQueue::BUFFER_TOO_SMALL:
00085             jack_error("JackFFADOMidiOutputPort::Process - The write queue "
00086                        "couldn't enqueue a %d-byte event. Dropping event.",
00087                        event->size);
00088             // Fallthrough on purpose
00089         case JackMidiWriteQueue::OK:
00090             continue;
00091         default:
00092             // This is here to stop compliers from warning us about not
00093             // handling enumeration values.
00094             ;
00095         }
00096         break;
00097     }
00098     raw_queue->Process(boundary_frame);
00099 }