libs/ardour/internal_return.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 <glibmm/thread.h>
  20
  21 #include "pbd/failed_constructor.h"
  22
  23 #include "ardour/audio_buffer.h"
  24 #include "ardour/internal_return.h"
  25 #include "ardour/mute_master.h"
  26 #include "ardour/session.h"
  27 #include "ardour/internal_send.h"
  28
  29 using namespace std;
  30 using namespace ARDOUR;
  31
  32 PBD::Signal1<void, pframes_t> InternalReturn::CycleStart;
  33
  34 InternalReturn::InternalReturn (Session& s)
  35         : Return (s, true)
  36 {
  37         CycleStart.connect_same_thread (*this, boost::bind (&InternalReturn::cycle_start, this, _1));
  38         _display_to_user = false;
  39 }
  40
  41 void
  42 InternalReturn::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, pframes_t nframes, bool)
  43 {
  44         if (!_active && !_pending_active) {
  45                 return;
  46         }
  47
  48         /* _sends is only modified with the process lock held, so this is ok, I think */
  49
  50         for (list<InternalSend*>::iterator i = _sends.begin(); i != _sends.end(); ++i) {
  51                 if ((*i)->active ()) {
  52                         bufs.merge_from ((*i)->get_buffers(), nframes);
  53                 }
  54         }
  55
  56 #if 0
  57         if (_session.transport_rolling()) {
  58                 for (BufferSet::audio_iterator b = bufs.audio_begin(); b != bufs.audio_end(); ++b) {
  59                         Sample* p = b->data ();
  60                         for (pframes_t n = 0; n < nframes; ++n) {
  61                                 if (p[n] != 0.0) {
  62                                         cerr << "\tnon-zero data received\n";
  63                                         break;
  64                                 }
  65                         }
  66                 }
  67         }
  68 #endif
  69
  70
  71         _active = _pending_active;
  72 }
  73
  74 bool
  75 InternalReturn::configure_io (ChanCount in, ChanCount out)
  76 {
  77         IOProcessor::configure_io (in, out);
  78         allocate_buffers (_session.engine().frames_per_cycle());
  79         return true;
  80 }
  81
  82 int
  83 InternalReturn::set_block_size (pframes_t nframes)
  84 {
  85         allocate_buffers (nframes);
  86         return 0;
  87 }
  88
  89 void
  90 InternalReturn::allocate_buffers (pframes_t nframes)
  91 {
  92         buffers.ensure_buffers (_configured_input, nframes);
  93         buffers.set_count (_configured_input);
  94 }
  95
  96 void
  97 InternalReturn::add_send (InternalSend* send)
  98 {
  99         Glib::Mutex::Lock lm (_session.engine().process_lock());
 100         _sends.push_back (send);
 101 }
 102
 103 void
 104 InternalReturn::remove_send (InternalSend* send)
 105 {
 106         Glib::Mutex::Lock lm (_session.engine().process_lock());
 107         _sends.remove (send);
 108 }
 109
 110 void
 111 InternalReturn::cycle_start (pframes_t nframes)
 112 {
 113         /* called from process cycle - no lock necessary */
 114         if (!_sends.empty ()) {
 115                 /* don't bother with this if nobody is going to feed us anything */
 116                 buffers.silence (nframes, 0);
 117         }
 118 }
 119
 120 XMLNode&
 121 InternalReturn::state (bool full)
 122 {
 123         XMLNode& node (Return::state (full));
 124         /* override type */
 125         node.add_property("type", "intreturn");
 126         return node;
 127 }
 128
 129 XMLNode&
 130 InternalReturn::get_state()
 131 {
 132         return state (true);
 133 }
 134
 135 int
 136 InternalReturn::set_state (const XMLNode& node, int version)
 137 {
 138         return Return::set_state (node, version);
 139 }
 140
 141 bool
 142 InternalReturn::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
 143 {
 144         out = in;
 145         return true;
 146 }
 147
 148