1 files changed, 82 insertions, 0 deletions
diff --git a/libs/ardour/ardour/mp3fileimportable.h b/libs/ardour/ardour/mp3fileimportable.h
new file mode 100644
index 0000000000..e209b7bf7d
--- /dev/null
+++ b/libs/ardour/ardour/mp3fileimportable.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2008-2017 Paul Davis <paul@linuxaudiosystems.com>
+ * 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.
+ */
+
+#ifndef _ardour_mp3file_importable_source_h_
+#define _ardour_mp3file_importable_source_h_
+
+#include <boost/shared_ptr.hpp>
+#include "ardour/libardour_visibility.h"
+#include "ardour/types.h"
+#include "ardour/importable_source.h"
+
+namespace ARDOUR {
+
+#if defined ( __i386__) || defined  (__PPC__)
+#define MINIMP3_NO_SIMD // for portability
+#endif
+
+#define MINIMP3_NONSTANDARD_BUT_LOGICAL
+#define MINIMP3_FLOAT_OUTPUT
+
+/* use Ardour namespace for minimp3 symbols */
+#include "ardour/minimp3.h"
+
+class LIBARDOUR_API Mp3FileImportableSource : public ImportableSource {
+public:
+	Mp3FileImportableSource (const std::string& path);
+	virtual ~Mp3FileImportableSource();
+
+	/* ImportableSource API */
+	uint32_t    channels () const { return _info.channels; }
+	samplecnt_t length () const { return _length; }
+	samplecnt_t samplerate () const { return _info.hz; }
+	samplepos_t natural_position () const { return 0 ; }
+	void        seek (samplepos_t pos);
+	samplecnt_t read (Sample*, samplecnt_t nframes);
+
+	bool clamped_at_unity () const { return false; }
+
+	samplecnt_t layer () const { return _info.layer; }
+	samplecnt_t bitrate () const { return _info.bitrate_kbps; }
+	samplecnt_t read_unlocked (Sample*, samplepos_t start, samplecnt_t cnt, uint32_t chn);
+
+private:
+	void unmap_mem ();
+	int  decode_mp3 ();
+
+	mp3dec_t            _mp3d;
+	mp3dec_frame_info_t _info;
+	samplecnt_t         _length;
+
+int              _fd;
+	const uint8_t* _map_addr;
+	size_t         _map_length;
+
+	const uint8_t* _buffer;
+	size_t         _remain;
+
+	samplepos_t   _read_position;
+	mp3d_sample_t _pcm[MINIMP3_MAX_SAMPLES_PER_FRAME];
+	size_t        _pcm_off;
+	int           _n_frames;
+};
+
+}
+
+#endif /* __ardour_mp3file_importable_source_h__ */