Paul Davis
7b6b75f38f
git-svn-id: svn://localhost/ardour2/branches/3.0@7653 d708f5d6-7413-0410-9779-e7cbd77b26cf
145 lines
3.2 KiB
C++
145 lines
3.2 KiB
C++
/*
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Copyright (C) 2009 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <glibmm/thread.h>
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#include "pbd/failed_constructor.h"
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#include "ardour/internal_return.h"
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#include "ardour/mute_master.h"
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#include "ardour/session.h"
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using namespace std;
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using namespace ARDOUR;
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PBD::Signal1<void,nframes_t> InternalReturn::CycleStart;
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InternalReturn::InternalReturn (Session& s)
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: Return (s, true)
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, user_count (0)
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{
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CycleStart.connect_same_thread (*this, boost::bind (&InternalReturn::cycle_start, this, _1));
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}
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void
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InternalReturn::run (BufferSet& bufs, framepos_t /*start_frame*/, framepos_t /*end_frame*/, nframes_t nframes, bool)
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{
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if (!_active && !_pending_active) {
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return;
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}
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/* no lock here, just atomic fetch */
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if (g_atomic_int_get(&user_count) == 0) {
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/* nothing to do - nobody is feeding us anything */
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return;
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}
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bufs.merge_from (buffers, nframes);
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_active = _pending_active;
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}
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bool
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InternalReturn::configure_io (ChanCount in, ChanCount out)
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{
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IOProcessor::configure_io (in, out);
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allocate_buffers (_session.engine().frames_per_cycle());
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return true;
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}
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int
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InternalReturn::set_block_size (nframes_t nframes)
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{
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allocate_buffers (nframes);
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return 0;
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}
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void
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InternalReturn::allocate_buffers (nframes_t nframes)
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{
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buffers.ensure_buffers (_configured_input, nframes);
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buffers.set_count (_configured_input);
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}
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BufferSet*
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InternalReturn::get_buffers ()
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{
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Glib::Mutex::Lock lm (_session.engine().process_lock());
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/* use of g_atomic here is just for code consistency - its protected by the lock
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for writing.
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*/
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g_atomic_int_inc (&user_count);
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return &buffers;
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}
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void
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InternalReturn::release_buffers ()
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{
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Glib::Mutex::Lock lm (_session.engine().process_lock());
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if (user_count) {
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/* use of g_atomic here is just for code consistency - its protected by the lock
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for writing.
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*/
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(void) g_atomic_int_dec_and_test (&user_count);
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}
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}
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void
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InternalReturn::cycle_start (nframes_t nframes)
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{
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/* called from process cycle - no lock necessary */
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if (user_count) {
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/* don't bother with this if nobody is going to feed us anything */
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buffers.silence (nframes, 0);
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}
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}
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XMLNode&
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InternalReturn::state (bool full)
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{
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XMLNode& node (Return::state (full));
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/* override type */
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node.add_property("type", "intreturn");
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return node;
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}
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XMLNode&
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InternalReturn::get_state()
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{
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return state (true);
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}
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int
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InternalReturn::set_state (const XMLNode& node, int version)
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{
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return Return::set_state (node, version);
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}
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bool
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InternalReturn::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
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{
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out = in;
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return true;
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}
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bool
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InternalReturn::visible () const
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{
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return false;
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}
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