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-rw-r--r--src/libs/engine/ConnectionImpl.cpp171
1 files changed, 171 insertions, 0 deletions
diff --git a/src/libs/engine/ConnectionImpl.cpp b/src/libs/engine/ConnectionImpl.cpp
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+/* 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 <algorithm>
+#include <raul/Maid.hpp>
+#include "util.hpp"
+#include "ConnectionImpl.hpp"
+#include "NodeImpl.hpp"
+#include "PortImpl.hpp"
+#include "BufferFactory.hpp"
+#include "AudioBuffer.hpp"
+#include "ProcessContext.hpp"
+
+namespace Ingen {
+
+
+/** Constructor for a connection from a node's output port.
+ *
+ * This handles both polyphonic and monophonic nodes, transparently to the
+ * user (InputPort).
+ */
+ConnectionImpl::ConnectionImpl(PortImpl* src_port, PortImpl* dst_port)
+ : _src_port(src_port)
+ , _dst_port(dst_port)
+ , _local_buffer(NULL)
+ , _buffer_size(dst_port->buffer_size())
+ /*, _must_mix( (src_port->poly() != dst_port->poly())
+ || (src_port->buffer(0)->size() < dst_port->buffer(0)->size()) )*/
+ , _must_mix( (src_port->polyphonic() && (! dst_port->polyphonic()))
+ || (src_port->poly() != dst_port->poly() )
+ || (src_port->buffer(0)->size() < dst_port->buffer(0)->size()) )
+ , _pending_disconnection(false)
+{
+ assert(src_port);
+ assert(dst_port);
+ assert(src_port->type() == dst_port->type());
+
+ /*assert((src_port->parent_node()->poly() == dst_port->parent_node()->poly())
+ || (src_port->parent_node()->poly() == 1 || dst_port->parent_node()->poly() == 1));*/
+
+ if (type() == DataType::MIDI)
+ _must_mix = false; // FIXME: kludge
+
+ if (_must_mix)
+ _local_buffer = BufferFactory::create(dst_port->type(), dst_port->buffer(0)->size());
+
+ //cerr << src_port->path() << " -> " << dst_port->path() << " must mix: " << _must_mix << endl;
+}
+
+
+ConnectionImpl::~ConnectionImpl()
+{
+ delete _local_buffer;
+}
+
+
+void
+ConnectionImpl::set_buffer_size(size_t size)
+{
+ if (_must_mix) {
+ assert(_local_buffer);
+ delete _local_buffer;
+
+ _local_buffer = BufferFactory::create(_dst_port->type(), _dst_port->buffer(0)->size());
+ }
+
+ _buffer_size = size;
+}
+
+
+void
+ConnectionImpl::prepare_poly(uint32_t poly)
+{
+ if (type() == DataType::CONTROL || type() == DataType::AUDIO)
+ _must_mix = (poly > 1) && (
+ (_src_port->poly() != _dst_port->poly())
+ || (_src_port->polyphonic() && !_dst_port->polyphonic())
+ || (_src_port->parent()->polyphonic() && !_dst_port->parent()->polyphonic()) );
+
+ /*cerr << src_port()->path() << " * " << src_port()->poly()
+ << " -> " << dst_port()->path() << " * " << dst_port()->poly()
+ << "\t\tmust mix: " << _must_mix << " at poly " << poly << endl;*/
+
+ if (_must_mix && ! _local_buffer)
+ _local_buffer = BufferFactory::create(_dst_port->type(), _dst_port->buffer(0)->size());
+}
+
+
+void
+ConnectionImpl::apply_poly(Raul::Maid& maid, uint32_t poly)
+{
+ if (poly == 1 && _local_buffer && !_must_mix) {
+ maid.push(_local_buffer);
+ _local_buffer = NULL;
+ }
+}
+
+
+void
+ConnectionImpl::process(ProcessContext& context)
+{
+ // FIXME: nframes parameter not used
+ assert(_buffer_size == 1 || _buffer_size == context.nframes());
+
+ /* 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 (_must_mix && (type() == DataType::CONTROL || type() == DataType::AUDIO)) {
+
+ const AudioBuffer* const src_buffer = (AudioBuffer*)src_port()->buffer(0);
+ AudioBuffer* mix_buf = (AudioBuffer*)_local_buffer;
+
+ assert(mix_buf);
+
+ const size_t copy_size = std::min(src_buffer->size(), mix_buf->size());
+
+ // Copy src buffer to start of mix buffer
+ mix_buf->copy((AudioBuffer*)src_port()->buffer(0), 0, copy_size-1);
+
+ // Write last value of src buffer to remainder of dst buffer, if necessary
+ if (copy_size < mix_buf->size())
+ mix_buf->set(src_buffer->value_at(copy_size-1), copy_size, mix_buf->size()-1);
+
+ // Accumulate the source's voices into local buffer starting at the second
+ // voice (buffer is already set to first voice above)
+ for (uint32_t j=1; j < src_port()->poly(); ++j) {
+ mix_buf->accumulate((AudioBuffer*)src_port()->buffer(j), 0, copy_size-1);
+ }
+
+ // Find the summed value and write it to the remainder of dst buffer
+ if (copy_size < mix_buf->size()) {
+ float src_value = src_buffer->value_at(copy_size-1);
+ for (uint32_t j=1; j < src_port()->poly(); ++j)
+ src_value += ((AudioBuffer*)src_port()->buffer(j))->value_at(copy_size-1);
+
+ mix_buf->set(src_value, copy_size, mix_buf->size()-1);
+ }
+
+ // Scale the buffer down.
+ if (src_port()->poly() > 1)
+ mix_buf->scale(1.0f/(float)src_port()->poly(), 0, _buffer_size-1);
+
+ } else if (_must_mix && type() == DataType::MIDI) {
+
+ cerr << "WARNING: No MIDI mixing." << endl;
+
+ }
+
+}
+
+
+} // namespace Ingen
+