Region export dialog: Make export channel and -selector polymorphic, add the region related classes and a dialog specialization

git-svn-id: svn://localhost/ardour2/branches/3.0@3915 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 142 insertions, 0 deletions

diff --git a/libs/ardour/export_channel.cc b/libs/ardour/export_channel.cc
new file mode 100644
index 0000000000..e0242a9f52
--- /dev/null
+++ b/libs/ardour/export_channel.cc
@@ -0,0 +1,142 @@
+/*
+    Copyright (C) 2008 Paul Davis
+    Author: Sakari Bergen
+
+    This program 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.
+
+    This program 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 more 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <ardour/export_channel.h>
+
+#include <ardour/export_failed.h>
+#include <ardour/audioengine.h>
+
+using namespace ARDOUR;
+
+bool
+PortExportChannel::operator< (ExportChannel const & other) const
+{
+	PortExportChannel const * pec;
+	if (!(pec = dynamic_cast<PortExportChannel const *> (&other))) {
+		return this < &other;
+	}
+	return ports < pec->ports;
+}
+
+void
+PortExportChannel::read (Sample * data, nframes_t frames) const
+{
+	memset (data, 0, frames * sizeof (float));
+
+	for (PortSet::const_iterator it = ports.begin(); it != ports.end(); ++it) {
+		if (*it != 0) {
+			Sample* port_buffer = (*it)->get_audio_buffer(frames, 0).data();
+			
+			for (uint32_t i = 0; i < frames; ++i) {
+				data[i] += (float) port_buffer[i];
+			}
+		}
+	}
+}
+
+void
+PortExportChannel::get_state (XMLNode * node) const
+{
+	XMLNode * port_node;
+	for (PortSet::const_iterator it = ports.begin(); it != ports.end(); ++it) {
+		if ((port_node = node->add_child ("Port"))) {
+			port_node->add_property ("name", (*it)->name());
+		}
+	}
+}
+
+void
+PortExportChannel::set_state (XMLNode * node, Session & session)
+{
+	XMLProperty * prop;
+	XMLNodeList xml_ports = node->children ("Port");
+	for (XMLNodeList::iterator it = xml_ports.begin(); it != xml_ports.end(); ++it) {
+		if ((prop = (*it)->property ("name"))) {
+			ports.insert (dynamic_cast<AudioPort *> (session.engine().get_port_by_name (prop->value())));
+		}
+	}
+}
+
+RegionExportChannelFactory::RegionExportChannelFactory (Session * session, AudioRegion const & region, AudioTrack & track, Type type) :
+  region (region),
+  track (track),
+  type (type),
+  frames_per_cycle (session->engine().frames_per_cycle ()),
+  buffers_up_to_date (false),
+  region_start (region.position()),
+  position (region_start)
+{
+	switch (type) {
+	  case Raw:
+		n_channels = region.n_channels();
+		break;
+	  case Processed:
+		n_channels = track.n_outputs().n_audio();
+		break;
+	  default:
+		throw ExportFailed ("Unhandled type in ExportChannelFactory constructor");
+	}
+	
+	session->ProcessExport.connect (sigc::hide (sigc::mem_fun (*this, &RegionExportChannelFactory::new_cycle_started)));
+	
+	buffers.set_count (ChanCount (DataType::AUDIO, n_channels));
+	buffers.ensure_buffers (DataType::AUDIO, n_channels, frames_per_cycle);
+}
+
+ExportChannelPtr
+RegionExportChannelFactory::create (uint32_t channel)
+{
+	assert (channel < n_channels);
+	return ExportChannelPtr (new RegionExportChannel (*this, channel));
+}
+
+void
+RegionExportChannelFactory::read (uint32_t channel, Sample * data, nframes_t frames_to_read)
+{
+	assert (channel < n_channels);
+	assert (frames_to_read <= frames_per_cycle);
+	
+	if (!buffers_up_to_date) {
+		update_buffers(frames_to_read);
+		buffers_up_to_date = true;
+	}
+	
+	memcpy (data, buffers.get_audio (channel).data(), frames_to_read * sizeof (Sample));
+}
+
+void
+RegionExportChannelFactory::update_buffers (nframes_t frames)
+{
+	switch (type) {
+	  case Raw:
+		for (size_t channel = 0; channel < n_channels; ++channel) {
+			region.read (buffers.get_audio (channel).data(), position - region_start, frames, channel);
+		}
+		break;
+	  case Processed:
+	  	std::cout << "exporting " << frames << " frames from position " << position << std::endl;
+		track.export_stuff (buffers, position, frames);
+		break;
+	  default:
+		throw ExportFailed ("Unhandled type in ExportChannelFactory::update_buffers");
+	}
+	
+	position += frames;
+}