SMFReader.hpp

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/* This file is part of Evoral.
 * Copyright(C) 2008 David Robillard <http://drobilla.net>
 * Copyright(C) 2000-2008 Paul Davis
 *
 * Evoral 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.
 *
 * Evoral 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
 */

#ifndef EVORAL_SMF_READER_HPP
#define EVORAL_SMF_READER_HPP

#include <exception>
#include <stdexcept>
#include <string>
#include <inttypes.h>

#include "evoral/visibility.h"

namespace Evoral {


class LIBEVORAL_API SMFReader {
public:
        class PrematureEOF : public std::exception {
                const char* what() const throw() { return "Unexpected end of file"; }
        };
        class CorruptFile : public std::exception {
                const char* what() const throw() { return "Corrupted file"; }
        };
        class UnsupportedTime : public std::exception {
                const char* what() const throw() { return "Unsupported time stamp type (SMPTE)"; }
        };

        SMFReader(const std::string& filename="");
        ~SMFReader();

        bool open(const std::string& filename) throw (std::logic_error, UnsupportedTime);

        bool seek_to_track(unsigned track) throw (std::logic_error);

        const std::string& filename() const { return _filename; };

        uint16_t type()       const { return _type; }
        uint16_t ppqn()       const { return _ppqn; }
        uint16_t num_tracks() const { return _num_tracks; }

        int read_event(size_t    buf_len,
                       uint8_t*  buf,
                       uint32_t* ev_size,
                       uint32_t* ev_delta_time)
                throw (std::logic_error, PrematureEOF, CorruptFile);

        void close();

        static uint32_t read_var_len(FILE* fd) throw (PrematureEOF);

protected:
        static const uint32_t HEADER_SIZE = 22;

        std::string _filename;
        FILE*       _fd;
        uint16_t    _type;
        uint16_t    _ppqn;
        uint16_t    _num_tracks;
        uint32_t    _track;
        uint32_t    _track_size;
};


} // namespace Evoral

#endif // EVORAL_SMF_READER_HPP