Break out API to create readables from files

1 files changed, 66 insertions, 0 deletions

diff --git a/libs/ardour/readable.cc b/libs/ardour/readable.cc
new file mode 100644
index 0000000000..0390a0169d
--- /dev/null
+++ b/libs/ardour/readable.cc
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2020 Robin Gareus <robin@gareus.org>
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <vector>
+
+#include "pbd/error.h"
+
+#include "ardour/audiofilesource.h"
+#include "ardour/readable.h"
+#include "ardour/session.h"
+#include "ardour/srcfilesource.h"
+#include "ardour/source_factory.h"
+
+#include "pbd/i18n.h"
+
+using namespace ARDOUR;
+
+std::vector<boost::shared_ptr<Readable> >
+Readable::load (Session& session, std::string const& path)
+{
+	std::vector<boost::shared_ptr<Readable> > readables;
+
+	ARDOUR::SoundFileInfo sf_info;
+	std::string error_msg;
+
+	if (!AudioFileSource::get_soundfile_info (path, sf_info, error_msg)) {
+		PBD::error << string_compose(_("Cannot open File \"%1\": %2"), path, error_msg) << endmsg;
+		throw failed_constructor ();
+	}
+
+	for (unsigned int n = 0; n < sf_info.channels; ++n) {
+		try {
+			boost::shared_ptr<AudioFileSource> afs;
+			afs = boost::dynamic_pointer_cast<AudioFileSource> (
+					SourceFactory::createExternal (DataType::AUDIO, session,
+						path, n,
+						Source::Flag (ARDOUR::AudioFileSource::NoPeakFile), false));
+
+			if (afs->sample_rate() != session.nominal_sample_rate()) {
+				boost::shared_ptr<SrcFileSource> sfs (new SrcFileSource(session, afs, ARDOUR::SrcBest));
+				readables.push_back(sfs);
+			} else {
+				readables.push_back (afs);
+			}
+		} catch (failed_constructor& err) {
+			PBD::error << string_compose(_("Could not read file \"%1\"."), path) << endmsg;
+			throw failed_constructor ();
+		}
+	}
+	return readables;
+}