first pass (ok, third really) at internal send+return - audio routing inside ardour without JACK. lots still to do, but at least the obvious works

git-svn-id: svn://localhost/ardour2/branches/3.0@5202 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 136 insertions, 0 deletions

diff --git a/libs/ardour/internal_return.cc b/libs/ardour/internal_return.cc
new file mode 100644
index 0000000000..409c87d93c
--- /dev/null
+++ b/libs/ardour/internal_return.cc
@@ -0,0 +1,136 @@
+/*
+    Copyright (C) 2009 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <glibmm/thread.h>
+
+#include "pbd/failed_constructor.h"
+
+#include "ardour/internal_return.h"
+#include "ardour/mute_master.h"
+#include "ardour/session.h"
+
+using namespace std;
+using namespace ARDOUR;
+
+sigc::signal<void,nframes_t> InternalReturn::CycleStart;
+
+InternalReturn::InternalReturn (Session& s)
+	: Return (s, true)
+	, user_count (0)
+{
+	CycleStart.connect (mem_fun (*this, &InternalReturn::cycle_start));
+}
+
+InternalReturn::InternalReturn (Session& s, const XMLNode& node)
+	: Return (s, node, true)
+	, user_count (0)
+{
+	CycleStart.connect (mem_fun (*this, &InternalReturn::cycle_start));
+}
+
+void
+InternalReturn::run (BufferSet& bufs, sframes_t start_frame, sframes_t end_frame, nframes_t nframes)
+{
+	if (user_count == 0) {
+		/* nothing to do - nobody is feeding us anything */
+		return;
+	}
+
+	/* XXX this should be merge() */
+
+	bufs.merge_from (buffers, nframes);
+}
+
+bool
+InternalReturn::configure_io (ChanCount in, ChanCount out)
+{
+	IOProcessor::configure_io (in, out);
+	allocate_buffers (_session.get_block_size());
+	return true;
+}
+
+void 
+InternalReturn::set_block_size (nframes_t nframes)
+{
+	allocate_buffers (nframes);
+}
+
+void
+InternalReturn::allocate_buffers (nframes_t nframes)
+{
+	buffers.ensure_buffers (DataType::AUDIO, _configured_input.n_audio(), nframes);
+	buffers.ensure_buffers (DataType::MIDI, _configured_input.n_midi(), nframes);
+}
+
+BufferSet*
+InternalReturn::get_buffers ()
+{
+	Glib::Mutex::Lock lm (_session.engine().process_lock());
+	user_count++;
+	return &buffers;
+}
+
+void
+InternalReturn::release_buffers ()
+{
+	Glib::Mutex::Lock lm (_session.engine().process_lock());
+	if (user_count) {
+		user_count--;
+	}
+}
+
+void
+InternalReturn::cycle_start (nframes_t nframes)
+{
+	/* called from process cycle - no lock necessary */
+	if (user_count) {
+		/* don't bother with this if nobody is going to feed us anything */
+		buffers.silence (nframes, 0);
+	}
+}
+
+XMLNode&
+InternalReturn::state (bool full)
+{
+	XMLNode& node (Return::state (full));
+	/* override type */
+	node.add_property("type", "intreturn");
+	return node;
+}
+
+XMLNode&
+InternalReturn::get_state()
+{
+	return state (true);
+}
+
+int
+InternalReturn::set_state (const XMLNode& node)
+{
+	return Return::set_state (node);
+}
+
+bool 
+InternalReturn::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
+{
+	out = in;
+	return true;
+}
+
+
+