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authorDavid Robillard <d@drobilla.net>2006-06-10 01:52:02 +0000
committerDavid Robillard <d@drobilla.net>2006-06-10 01:52:02 +0000
commit98fe0e7056e6697396249531785d3899f94d79be (patch)
tree233319008d4bfb6c8bdc546bdf4a81b87ecf7f3a /src/libs/engine/ConnectionBase.cpp
parent6c8eaee73b0ea66216744f49b452e22e26fe83e1 (diff)
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More juggling
git-svn-id: http://svn.drobilla.net/lad/grauph@15 a436a847-0d15-0410-975c-d299462d15a1
Diffstat (limited to 'src/libs/engine/ConnectionBase.cpp')
-rw-r--r--src/libs/engine/ConnectionBase.cpp96
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diff --git a/src/libs/engine/ConnectionBase.cpp b/src/libs/engine/ConnectionBase.cpp
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+/* This file is part of Om. Copyright (C) 2006 Dave Robillard.
+ *
+ * Om 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.
+ *
+ * Om 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 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "ConnectionBase.h"
+#include "util.h"
+#include "InputPort.h"
+#include "OutputPort.h"
+#include "Node.h"
+#include "Om.h"
+#include "Port.h"
+
+namespace Om {
+
+
+/** Constructor for a connection from a node's output port.
+ *
+ * This handles both polyphonic and monophonic nodes, transparently to the
+ * user (InputPort).
+ */
+template <typename T>
+ConnectionBase<T>::ConnectionBase(OutputPort<T>* const src_port, InputPort<T>* const dst_port)
+: Connection(src_port, dst_port),
+ m_local_buffer(NULL),
+ m_is_poly_to_mono( (src_port->parent_node()->poly() > dst_port->parent_node()->poly()) ),
+ m_buffer_size(src_port->buffer_size()),
+ m_pending_disconnection(false)
+{
+ assert((src_port->parent_node()->poly() == dst_port->parent_node()->poly())
+ || (src_port->parent_node()->poly() == 1 || dst_port->parent_node()->poly() == 1));
+
+ if (m_is_poly_to_mono) // Poly -> Mono connection, need a buffer to mix in to
+ m_local_buffer = new Buffer<T>(m_buffer_size);
+}
+template ConnectionBase<sample>::ConnectionBase(OutputPort<sample>* const src_port, InputPort<sample>* const dst_port);
+template ConnectionBase<MidiMessage>::ConnectionBase(OutputPort<MidiMessage>* const src_port, InputPort<MidiMessage>* const dst_port);
+
+
+template <typename T>
+ConnectionBase<T>::~ConnectionBase()
+{
+ delete m_local_buffer;
+}
+template ConnectionBase<sample>::~ConnectionBase();
+template ConnectionBase<MidiMessage>::~ConnectionBase();
+
+
+template <typename sample>
+void
+ConnectionBase<sample>::prepare_buffers()
+{
+ /* Thought: A poly output port can be connected to multiple mono input
+ * ports, which means this mix down would have to happen many times.
+ * Adding a method to OutputPort that mixes down all it's outputs into
+ * a buffer (if it hasn't been done already this cycle) and returns that
+ * would avoid having to mix multiple times. Probably not a very common
+ * case, but it would be faster anyway. */
+
+ if (m_is_poly_to_mono) {
+ m_local_buffer->copy(src_port()->buffer(0), 0, m_buffer_size-1);
+
+ // Mix all the source's voices down into local buffer starting at the second
+ // voice (buffer is already set to first voice above)
+ for (size_t j=1; j < src_port()->poly(); ++j)
+ m_local_buffer->accumulate(src_port()->buffer(j), 0, m_buffer_size-1);
+
+ // Scale the buffer down.
+ if (src_port()->poly() > 1)
+ m_local_buffer->scale(1.0f/(float)src_port()->poly(), 0, m_buffer_size-1);
+ }
+}
+template void ConnectionBase<sample>::prepare_buffers();
+
+
+// FIXME: MIDI mixing not implemented
+template <>
+void
+ConnectionBase<MidiMessage>::prepare_buffers()
+{
+}
+
+
+} // namespace Om
+