1 files changed, 114 insertions, 0 deletions
diff --git a/src/server/mix.cpp b/src/server/mix.cpp
new file mode 100644
index 00000000..ca2ce42b
--- /dev/null
+++ b/src/server/mix.cpp
@@ -0,0 +1,114 @@
+/*
+  This file is part of Ingen.
+  Copyright 2007-2012 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ingen/shared/URIs.hpp"
+#include "raul/log.hpp"
+
+#include "AudioBuffer.hpp"
+#include "Buffer.hpp"
+#include "Context.hpp"
+
+namespace Ingen {
+namespace Server {
+
+static inline bool
+is_audio(Shared::URIs& uris, LV2_URID type)
+{
+	return type == uris.atom_Float || type == uris.atom_Sound;
+}
+
+static inline void
+audio_accumulate(Context& context, AudioBuffer* dst, const AudioBuffer* src)
+{
+	Sample* const       dst_buf = dst->data();
+	const Sample* const src_buf = src->data();
+
+	if (dst->is_control()) {
+		if (src->is_control()) {  // control => control
+			dst_buf[0] += src_buf[0];
+		} else {  // audio => control
+			dst_buf[0] += src_buf[context.offset()];
+		}
+	} else {
+		const SampleCount end = context.offset() + context.nframes();
+		if (src->is_control()) {  // control => audio
+			for (SampleCount i = context.offset(); i < end; ++i) {
+				dst_buf[i] += src_buf[0];
+			}
+		} else {  // audio => audio
+			for (SampleCount i = context.offset(); i < end; ++i) {
+				dst_buf[i] += src_buf[i];
+			}
+		}
+	}
+}
+
+void
+mix(Context&            context,
+    Shared::URIs&       uris,
+    Buffer*             dst,
+    const Buffer*const* srcs,
+    uint32_t            num_srcs)
+{
+	if (num_srcs == 1) {
+		dst->copy(context, srcs[0]);
+	} else if (is_audio(uris, dst->type())) {
+		// Copy the first source
+		dst->copy(context, srcs[0]);
+
+		// Mix in the rest
+		for (uint32_t i = 1; i < num_srcs; ++i) {
+			assert(is_audio(uris, srcs[i]->type()));
+			audio_accumulate(context,
+			                 (AudioBuffer*)dst,
+			                 (const AudioBuffer*)srcs[i]);
+		}
+	} else {
+		std::cerr << "FIXME: event mix" << std::endl;
+	}
+#if 0
+	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();
+#endif
+}
+
+} // namespace Server
+} // namespace Ingen