Event mixing.

git-svn-id: http://svn.drobilla.net/lad/trunk/ingen@2337 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 84 insertions, 0 deletions

diff --git a/src/engine/mix.hpp b/src/engine/mix.hpp
new file mode 100644
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+++ b/src/engine/mix.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 Dave Robillard <http://drobilla.net>
+ *
+ * Ingen 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.
+ *
+ * Ingen 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef MIX_HPP
+#define MIX_HPP
+
+#include <iostream>
+#include "interface/PortType.hpp"
+#include "Buffer.hpp"
+#include "Context.hpp"
+
+namespace Ingen {
+
+inline void
+mix(Context& context, Buffer* dst, const Buffer*const* srcs, uint32_t num_srcs)
+{
+	using Shared::PortType;
+	switch (dst->type().symbol()) {
+	case PortType::AUDIO:
+	case PortType::CONTROL:
+		// Copy the first source
+		dst->copy(context, srcs[0]);
+
+		// Mix in the rest
+		for (uint32_t i = 1; i < num_srcs; ++i) {
+			assert(srcs[i]->type() == PortType::AUDIO || srcs[i]->type() == PortType::CONTROL);
+			((AudioBuffer*)dst)->accumulate(context, (AudioBuffer*)srcs[i]);
+		}
+
+		break;
+
+	case PortType::EVENTS:
+		dst->clear();
+		for (uint32_t i = 0; i < num_srcs; ++i) {
+			assert(srcs[i]->type() == PortType::EVENTS);
+			srcs[i]->rewind();
+		}
+
+		while (true) {
+			const EventBuffer* first = NULL;
+			for (uint32_t i = 0; i < num_srcs; ++i) {
+				const EventBuffer* const src = (const EventBuffer*)srcs[i];
+				if (src->is_valid()) {
+					if (!first || src->get_event()->frames < first->get_event()->frames)
+						first = src;
+				}
+			}
+			if (first) {
+				const LV2_Event* const ev = first->get_event();
+				((EventBuffer*)dst)->append(
+					ev->frames, ev->subframes, ev->type, ev->size,
+					(const uint8_t*)ev + sizeof(LV2_Event));
+				first->increment();
+			} else {
+				break;
+			}
+		}
+
+		dst->rewind();
+		break;
+
+	default:
+		std::cerr << "ERROR: Mix of unsupported buffer types" << std::endl;
+		return;
+	}
+}
+
+} // namespace Ingen
+
+#endif // MIX_HPP