1 files changed, 300 insertions, 0 deletions
diff --git a/src/libs/engine/AudioBuffer.cpp b/src/libs/engine/AudioBuffer.cpp
new file mode 100644
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--- /dev/null
+++ b/src/libs/engine/AudioBuffer.cpp
@@ -0,0 +1,300 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007 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
+ */
+
+#include <iostream>
+#include <cassert>
+#include <stdlib.h>
+#include "AudioBuffer.h"
+using std::cerr; using std::endl;
+
+/* TODO: Be sure these functions are vectorized by GCC when it's vectorizer
+ * stops sucking.  Probably a good idea to inline them as well */
+
+namespace Ingen {
+
+
+AudioBuffer::AudioBuffer(size_t size)
+	: Buffer(DataType::FLOAT, size)
+	, _data(NULL)
+	, _local_data(NULL)
+	, _joined_buf(NULL)
+	, _size(size)
+	, _filled_size(0)
+	, _state(OK)
+	, _set_value(0)
+{
+	assert(_size > 0);
+	allocate();
+	assert(data());
+}
+
+
+void
+AudioBuffer::resize(size_t size)
+{
+	_size = size;
+
+	Sample* const old_data = _data;
+	
+	const bool using_local_data = (_data == _local_data);
+
+	deallocate();
+
+	const int ret = posix_memalign((void**)&_local_data, 16, _size * sizeof(Sample));
+	if (ret != 0) {
+		cerr << "[Buffer] Failed to allocate buffer.  Aborting." << endl;
+		exit(EXIT_FAILURE);
+	}
+		
+	assert(ret == 0);
+	assert(_local_data);
+	
+	if (using_local_data)
+		_data = _local_data;
+	else
+		_data = old_data;
+
+	set(0, 0, _size-1);
+}
+
+
+/** Allocate and use a locally managed buffer (data).
+ */
+void
+AudioBuffer::allocate()
+{
+	assert(!_joined_buf);
+	assert(_local_data == NULL);
+	assert(_size > 0);
+
+	const int ret = posix_memalign((void**)&_local_data, 16, _size * sizeof(Sample));
+	if (ret != 0) {
+		cerr << "[Buffer] Failed to allocate buffer.  Aborting." << endl;
+		exit(EXIT_FAILURE);
+	}
+		
+	assert(ret == 0);
+	assert(_local_data);
+
+	_data = _local_data;
+
+	set(0, 0, _size-1);
+}
+
+
+/** Free locally allocated buffer.
+ */
+void
+AudioBuffer::deallocate()
+{
+	assert(!_joined_buf);
+	free(_local_data);
+	_local_data = NULL;
+	_data = NULL;
+}
+
+
+/** Empty (ie zero) the buffer.
+ */
+void
+AudioBuffer::clear()
+{
+	set(0, 0, _size-1);
+	_state = OK;
+	_filled_size = 0;
+}
+
+
+/** Set value of buffer to @a val after @a start_sample.
+ *
+ * The Buffer will handle setting the intial portion of the buffer to the
+ * value on the next cycle automatically (if @a start_sample is > 0), as
+ * long as pre_process() is called every cycle.
+ */
+void
+AudioBuffer::set(Sample val, size_t start_sample)
+{
+	assert(start_sample < _size);
+
+	set(val, start_sample, _size-1);
+	
+	if (start_sample > 0)
+		_state = HALF_SET_CYCLE_1;
+
+	_set_value = val;
+}
+
+
+/** Set a block of buffer to @a val.
+ *
+ * @a start_sample and @a end_sample define the inclusive range to be set.
+ */
+void
+AudioBuffer::set(Sample val, size_t start_sample, size_t end_sample)
+{
+	assert(end_sample >= start_sample);
+	assert(end_sample < _size);
+	
+	Sample* const buf = data();
+	assert(buf);
+
+	for (size_t i=start_sample; i <= end_sample; ++i)
+		buf[i] = val;
+}
+
+
+/** Scale a block of buffer by @a val.
+ *
+ * @a start_sample and @a end_sample define the inclusive range to be set.
+ */
+void
+AudioBuffer::scale(Sample val, size_t start_sample, size_t end_sample)
+{
+	assert(end_sample >= start_sample);
+	assert(end_sample < _size);
+	
+	Sample* const buf = data();
+	assert(buf);
+
+	for (size_t i=start_sample; i <= end_sample; ++i)
+		buf[i] *= val;
+}
+
+
+/** Copy a block of @a src into buffer.
+ *
+ * @a start_sample and @a end_sample define the inclusive range to be set.
+ * This function only copies the same range in one buffer to another.
+ */
+void
+AudioBuffer::copy(const AudioBuffer* src, size_t start_sample, size_t end_sample)
+{
+	assert(end_sample >= start_sample);
+	assert(end_sample < _size);
+	assert(src);
+	
+	Sample* const buf = data();
+	assert(buf);
+	
+	const Sample* const src_buf = src->data();
+	assert(src_buf);
+
+	for (size_t i=start_sample; i <= end_sample; ++i)
+		buf[i] = src_buf[i];
+}
+
+
+/** Accumulate a block of @a src into @a dst.
+ *
+ * @a start_sample and @a end_sample define the inclusive range to be accumulated.
+ * This function only adds the same range in one buffer to another.
+ */
+void
+AudioBuffer::accumulate(const AudioBuffer* const src, size_t start_sample, size_t end_sample)
+{
+	assert(end_sample >= start_sample);
+	assert(end_sample < _size);
+	assert(src);
+	
+	Sample* const buf = data();
+	assert(buf);
+	
+	const Sample* const src_buf = src->data();
+	assert(src_buf);
+
+	for (size_t i=start_sample; i <= end_sample; ++i)
+		buf[i] += src_buf[i];
+	
+}
+
+
+/** Use another buffer's data instead of the local one.
+ *
+ * This buffer will essentially be identical to @a buf after this call.
+ */
+bool
+AudioBuffer::join(Buffer* buf)
+{
+	AudioBuffer* abuf = dynamic_cast<AudioBuffer*>(buf);
+	if (!abuf)
+		return false;
+
+	assert(abuf->size() == _size);
+	
+	_joined_buf = abuf;
+	_filled_size = abuf->filled_size();
+
+	assert(_filled_size <= _size);
+
+	return true;
+}
+
+	
+void
+AudioBuffer::unjoin()
+{
+	_joined_buf = NULL;
+	_data = _local_data;
+}
+
+
+bool
+AudioBuffer::is_joined_to(Buffer* buf) const
+{
+	AudioBuffer* abuf = dynamic_cast<AudioBuffer*>(buf);
+	if (abuf)
+		return (data() == abuf->data());
+
+	return false;
+}
+
+
+void
+AudioBuffer::prepare(SampleCount nframes)
+{
+	// FIXME: nframes parameter doesn't actually work,
+	// writing starts from 0 every time
+	assert(_size == 1 || nframes == _size);
+
+	switch (_state) {
+	case HALF_SET_CYCLE_1:
+		_state = HALF_SET_CYCLE_2;
+		break;
+	case HALF_SET_CYCLE_2:
+		set(_set_value, 0, _size-1);
+		_state = OK;
+		break;
+	default:
+		break;
+	}
+}
+
+
+/** Set the buffer (data) used.
+ *
+ * This is only to be used by Drivers (to provide zero-copy processing).
+ */
+void
+AudioBuffer::set_data(Sample* buf)
+{
+	assert(buf);
+	assert(!_joined_buf);
+	_data = buf;
+}
+
+
+} // namespace Ingen