SMFReader.hpp

/* This file is part of Raul.
 * Copyright (C) 2007-2009 David Robillard <http://drobilla.net>
 *
 * Raul 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.
 *
 * Raul 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 RAUL_SMF_READER_HPP
#define RAUL_SMF_READER_HPP

#include <stdexcept>
#include <string>
#include <inttypes.h>
#include "raul/TimeStamp.hpp"

namespace Raul {


class 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)"; }
    };

    explicit 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);

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

#endif // RAUL_SMF_READER_HPP