libs/ardour/midi_ui.cc

   1 /*
   2   Copyright (C) 2009 Paul Davis
   3
   4   This program is free software; you can redistribute it and/or modify
   5   it under the terms of the GNU General Public License as published by
   6   the Free Software Foundation; either version 2 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 General Public License for more details.
  13
  14   You should have received a copy of the GNU General Public License
  15   along with this program; if not, write to the Free Software
  16   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19 #include <cstdlib>
  20
  21 #include <sigc++/signal.h>
  22
  23 #include "pbd/pthread_utils.h"
  24
  25 #include "midi++/manager.h"
  26 #include "midi++/port.h"
  27
  28 #include "ardour/debug.h"
  29 #include "ardour/audioengine.h"
  30 #include "ardour/midi_ui.h"
  31 #include "ardour/session.h"
  32 #include "ardour/session_event.h"
  33 #include "ardour/types.h"
  34
  35 using namespace std;
  36 using namespace ARDOUR;
  37 using namespace Glib;
  38
  39 #include "i18n.h"
  40
  41 BaseUI::RequestType MidiControlUI::PortChange = BaseUI::new_request_type();
  42 MidiControlUI* MidiControlUI::_instance = 0;
  43
  44 #include "pbd/abstract_ui.cc"  /* instantiate the template */
  45
  46 MidiControlUI::MidiControlUI (Session& s)
  47         : AbstractUI<MidiUIRequest> (_("midiui"))
  48         , _session (s)
  49 {
  50         MIDI::Manager::instance()->PortsChanged.connect_same_thread (rebind_connection, boost::bind (&MidiControlUI::change_midi_ports, this));
  51         _instance = this;
  52 }
  53
  54 MidiControlUI::~MidiControlUI ()
  55 {
  56         clear_ports ();
  57         _instance = 0;
  58 }
  59
  60 void
  61 MidiControlUI::do_request (MidiUIRequest* req)
  62 {
  63         if (req->type == PortChange) {
  64
  65                 /* restart event loop with new ports */
  66                 DEBUG_TRACE (DEBUG::MidiIO, "reset ports\n");
  67                 reset_ports ();
  68
  69         } else if (req->type == CallSlot) {
  70
  71 #ifndef NDEBUG
  72                 if (getenv ("DEBUG_THREADED_SIGNALS")) {
  73                         cerr << "MIDI UI calls a slot\n";
  74                 }
  75 #endif
  76
  77                 req->the_slot ();
  78
  79         } else if (req->type == Quit) {
  80
  81                 BaseUI::quit ();
  82         }
  83 }
  84
  85 void
  86 MidiControlUI::change_midi_ports ()
  87 {
  88         MidiUIRequest* req = get_request (PortChange);
  89         if (req == 0) {
  90                 return;
  91         }
  92         send_request (req);
  93 }
  94
  95 bool
  96 MidiControlUI::midi_input_handler (IOCondition ioc, MIDI::Port* port)
  97 {
  98         DEBUG_TRACE (DEBUG::MidiIO, string_compose ("something happend on  %1\n", port->name()));
  99
 100         if (ioc & ~IO_IN) {
 101                 return false;
 102         }
 103
 104         if (ioc & IO_IN) {
 105
 106                 if (port->must_drain_selectable()) {
 107                         CrossThreadChannel::drain (port->selectable());
 108                 }
 109
 110                 DEBUG_TRACE (DEBUG::MidiIO, string_compose ("data available on %1\n", port->name()));
 111                 nframes64_t now = _session.engine().frame_time();
 112                 port->parse (now);
 113         }
 114
 115         return true;
 116 }
 117
 118 void
 119 MidiControlUI::clear_ports ()
 120 {
 121         for (PortSources::iterator i = port_sources.begin(); i != port_sources.end(); ++i) {
 122                 g_source_destroy (*i);
 123                 g_source_unref (*i);
 124         }
 125
 126         port_sources.clear ();
 127 }
 128
 129 void
 130 MidiControlUI::reset_ports ()
 131 {
 132         clear_ports ();
 133
 134         MIDI::Manager::PortList plist = MIDI::Manager::instance()->get_midi_ports ();
 135
 136         for (MIDI::Manager::PortList::iterator i = plist.begin(); i != plist.end(); ++i) {
 137                 int fd;
 138
 139                 if ((fd = (*i)->selectable ()) >= 0) {
 140                         Glib::RefPtr<IOSource> psrc = IOSource::create (fd, IO_IN|IO_HUP|IO_ERR);
 141
 142                         psrc->connect (sigc::bind (sigc::mem_fun (this, &MidiControlUI::midi_input_handler), *i));
 143                         psrc->attach (_main_loop->get_context());
 144
 145                         // glibmm hack: for now, store only the GSource*
 146
 147                         port_sources.push_back (psrc->gobj());
 148                         g_source_ref (psrc->gobj());
 149                 }
 150         }
 151 }
 152
 153 void
 154 MidiControlUI::thread_init ()
 155 {
 156         struct sched_param rtparam;
 157
 158         char* c = new char[7];
 159         strcpy (c, X_("midiUI"));
 160         pthread_set_name (c);
 161
 162         cerr << "MIDI UI running\n";
 163
 164         PBD::notify_gui_about_thread_creation (X_("gui"), pthread_self(), X_("MIDI"), 2048);
 165         SessionEvent::create_per_thread_pool (X_("MIDI I/O"), 128);
 166
 167         memset (&rtparam, 0, sizeof (rtparam));
 168         rtparam.sched_priority = 9; /* XXX should be relative to audio (JACK) thread */
 169
 170         if (pthread_setschedparam (pthread_self(), SCHED_FIFO, &rtparam) != 0) {
 171                 // do we care? not particularly.
 172         }
 173
 174         reset_ports ();
 175 }
 176