2 Copyright (C) 2009 Paul Davis
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.
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.
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.
19 #include <glibmm/thread.h>
21 #include "pbd/failed_constructor.h"
23 #include "ardour/internal_return.h"
24 #include "ardour/mute_master.h"
25 #include "ardour/session.h"
28 using namespace ARDOUR;
30 PBD::Signal1<void,nframes_t> InternalReturn::CycleStart;
32 InternalReturn::InternalReturn (Session& s)
36 CycleStart.connect_same_thread (*this, boost::bind (&InternalReturn::cycle_start, this, _1));
37 _display_to_user = false;
41 InternalReturn::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, nframes_t nframes, bool)
43 if (!_active && !_pending_active) {
47 /* no lock here, just atomic fetch */
49 if (g_atomic_int_get(&user_count) == 0) {
50 /* nothing to do - nobody is feeding us anything */
54 bufs.merge_from (buffers, nframes);
55 _active = _pending_active;
59 InternalReturn::configure_io (ChanCount in, ChanCount out)
61 IOProcessor::configure_io (in, out);
62 allocate_buffers (_session.engine().frames_per_cycle());
67 InternalReturn::set_block_size (nframes_t nframes)
69 allocate_buffers (nframes);
74 InternalReturn::allocate_buffers (nframes_t nframes)
76 buffers.ensure_buffers (_configured_input, nframes);
77 buffers.set_count (_configured_input);
81 InternalReturn::get_buffers ()
83 Glib::Mutex::Lock lm (_session.engine().process_lock());
84 /* use of g_atomic here is just for code consistency - its protected by the lock
87 g_atomic_int_inc (&user_count);
92 InternalReturn::release_buffers ()
94 Glib::Mutex::Lock lm (_session.engine().process_lock());
96 /* use of g_atomic here is just for code consistency - its protected by the lock
99 (void) g_atomic_int_dec_and_test (&user_count);
104 InternalReturn::cycle_start (nframes_t nframes)
106 /* called from process cycle - no lock necessary */
108 /* don't bother with this if nobody is going to feed us anything */
109 buffers.silence (nframes, 0);
114 InternalReturn::state (bool full)
116 XMLNode& node (Return::state (full));
118 node.add_property("type", "intreturn");
123 InternalReturn::get_state()
129 InternalReturn::set_state (const XMLNode& node, int version)
131 return Return::set_state (node, version);
135 InternalReturn::can_support_io_configuration (const ChanCount& in, ChanCount& out) const