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+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_ENGINE_AUDIOBUFFER_HPP
+#define INGEN_ENGINE_AUDIOBUFFER_HPP
+
+#include <cstddef>
+#include <cassert>
+#include <boost/utility.hpp>
+#include "types.hpp"
+#include "ObjectBuffer.hpp"
+#include "Context.hpp"
+
+using namespace std;
+
+namespace Ingen {
+namespace Server {
+
+class AudioBuffer : public ObjectBuffer
+{
+public:
+ AudioBuffer(BufferFactory& bufs, PortType type, size_t capacity);
+
+ void clear();
+
+ void set_value(Sample val, FrameTime cycle_start, FrameTime time);
+ void set_block(Sample val, size_t start_offset, size_t end_offset);
+ void copy(const Sample* src, size_t start_sample, size_t end_sample);
+ void copy(Context& context, const Buffer* src);
+ void accumulate(Context& context, const AudioBuffer* src);
+
+ inline bool is_control() const { return _type.symbol() == PortType::CONTROL; }
+
+ inline Sample* data() const {
+ return (is_control())
+ ? (Sample*)atom()->body
+ : (Sample*)(atom()->body + sizeof(LV2_Atom_Vector));
+ }
+
+ inline SampleCount nframes() const {
+ return (is_control())
+ ? 1
+ : (_size - sizeof(LV2_Atom) - sizeof(LV2_Atom_Vector)) / sizeof(Sample);
+ }
+
+ inline Sample& value_at(size_t offset) const
+ { assert(offset < nframes()); return data()[offset]; }
+
+ void prepare_read(Context& context);
+ void prepare_write(Context& context) {}
+
+ void resize(size_t size);
+
+private:
+ enum State { OK, HALF_SET_CYCLE_1, HALF_SET_CYCLE_2 };
+
+ LV2_Atom_Vector* vector() { return(LV2_Atom_Vector*)atom()->body; }
+
+ State _state; ///< State of buffer for setting values next cycle
+ Sample _set_value; ///< Value set by set_value (for completing the set next cycle)
+ FrameTime _set_time; ///< Time _set_value was set (to reset next cycle)
+};
+
+/** Accumulate a block of @a src into buffer.
+ */
+inline void
+AudioBuffer::accumulate(Context& context, const AudioBuffer* const src)
+{
+ Sample* const buf = data();
+ const Sample* const src_buf = src->data();
+
+ if (is_control()) {
+ if (src->is_control()) { // control => control
+ buf[0] += src_buf[0];
+ } else { // audio => control
+ 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) {
+ buf[i] += src_buf[0];
+ }
+ } else { // audio => audio
+ for (SampleCount i = context.offset(); i < end; ++i) {
+ buf[i] += src_buf[i];
+ }
+ }
+ }
+}
+
+} // namespace Server
+} // namespace Ingen
+
+#endif // INGEN_ENGINE_AUDIOBUFFER_HPP