rollback to 3428, before the mysterious removal of libs/* at 3431/3432

git-svn-id: svn://localhost/ardour2/branches/3.0@3435 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 71 insertions, 0 deletions

diff --git a/libs/ardour/internal_audio_port.cc b/libs/ardour/internal_audio_port.cc
new file mode 100644
index 0000000000..e5362cde95
--- /dev/null
+++ b/libs/ardour/internal_audio_port.cc
@@ -0,0 +1,71 @@
+/*
+    Copyright (C) 2006 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 <cassert>
+#include <ardour/internal_audio_port.h>
+#include <ardour/audioengine.h>
+
+using namespace ARDOUR;
+using namespace std;
+
+void
+InternalAudioPort::default_mixdown (const list<InternalPort*>& ports, AudioBuffer& dest, nframes_t cnt, nframes_t offset)
+{
+	list<InternalPort*>::const_iterator p = ports.begin();
+
+	dest.read_from ((dynamic_cast<AudioPort*>(*p))->get_audio_buffer(), cnt, offset);
+
+	for (; p != ports.end(); ++p) {
+		dest.accumulate_from ((dynamic_cast<AudioPort*>(*p))->get_audio_buffer(), cnt, offset);
+	}
+}
+
+InternalAudioPort::InternalAudioPort(const string& name, Flags flags)
+	: Port (DataType::AUDIO, flags)
+	, AudioPort (flags, engine->frames_per_cycle())
+	, InternalPort (name, DataType::AUDIO, flags)
+{
+	_mixdown = default_mixdown;
+}
+
+void 
+InternalAudioPort::set_mixdown_function (void (*func)(const list<InternalPort*>&, AudioBuffer&, nframes_t, nframes_t))
+{
+	_mixdown = func;
+}
+
+void
+InternalAudioPort::reset ()
+{
+	_buffer.resize (engine->frames_per_cycle());
+	_buffer.silence (_buffer.size());
+}
+
+AudioBuffer&
+InternalAudioPort::get_audio_buffer ()
+{
+	if (_connections.empty()) {
+		return AudioPort::get_audio_buffer();
+	}
+
+	/* XXX what about offset/size being more dynamic ? */
+	
+	(*_mixdown) (_connections, _buffer, _buffer.size(), 0);
+
+	return _buffer;
+}