Implement mp3 import, using minimp3

1 files changed, 77 insertions, 0 deletions

diff --git a/libs/ardour/mp3filesource.cc b/libs/ardour/mp3filesource.cc
new file mode 100644
index 0000000000..7b90e93f3d
--- /dev/null
+++ b/libs/ardour/mp3filesource.cc
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019 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 "pbd/error.h"
+#include "pbd/compose.h"
+#include "ardour/mp3filesource.h"
+
+#include "pbd/i18n.h"
+
+using namespace ARDOUR;
+using namespace PBD;
+
+/** Constructor to be called for existing external-to-session files
+ * Sources created with this method are never writable or removable.
+ */
+
+Mp3FileSource::Mp3FileSource (Session& s, const string& path, int chn, Flag flags)
+	: Source (s, DataType::AUDIO, path,
+			Source::Flag (flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
+	, AudioFileSource (s, path,
+			Source::Flag (flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
+	, _mp3 (path)
+	, _channel (chn)
+{
+	_length = _mp3.length ();
+
+	if (_channel >= (int) _mp3.channels ()) {
+		error << string_compose("Mp3FileSource: file only contains %1 channels; %2 is invalid as a channel number (%3)", _mp3.channels (), _channel, name()) << endmsg;
+		throw failed_constructor();
+	}
+}
+
+Mp3FileSource::~Mp3FileSource ()
+{
+}
+
+void
+Mp3FileSource::close ()
+{
+}
+
+samplecnt_t
+Mp3FileSource::read_unlocked (Sample* dst, samplepos_t start, samplecnt_t cnt) const
+{
+	return _mp3.read_unlocked (dst, start, cnt, _channel);
+}
+
+int
+Mp3FileSource::get_soundfile_info (string path, SoundFileInfo& _info, string& error_msg)
+{
+	try {
+		Mp3FileImportableSource mp3 (path);
+		_info.samplerate  = mp3.samplerate ();
+		_info.channels    = mp3.channels ();
+		_info.length      = mp3.length ();
+		_info.format_name = string_compose (_("MPEG Layer %1 (%2 kbps)"), mp3.layer (), mp3.bitrate ());
+		_info.timecode    = 0;
+		_info.seekable    = false;
+		return 0;
+	} catch (...) {}
+	return -1;
+}