SMFReader.h

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/*
 * Copyright (C) 2008-2011 David Robillard <d@drobilla.net>
 *
 * 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 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