ltc_file_reader.h

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/*
 * Copyright (C) 2015-2019 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.
 */
 
#pragma once
 
#include <vector>
#include <sndfile.h>
 
#include <ltc.h>
 
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
 
namespace ARDOUR {
 
class LIBARDOUR_API LTCReader
{
public:
        LTCReader (int expected_apv, LTC_TV_STANDARD tv_standard = LTC_TV_FILM_24);
        ~LTCReader ();
 
        void write (float const*, samplecnt_t n_samples, samplepos_t pos = -1);
        void raw_write (ltcsnd_sample_t*, size_t, ltc_off_t);
 
        samplepos_t read (uint32_t& hh, uint32_t& mm, uint32_t& ss, uint32_t& ff, samplecnt_t& len);
 
private:
        LTCDecoder* _decoder;
        samplecnt_t _position;
};
 
class LIBARDOUR_API LTCFileReader
{
public:
        struct LTCMap {
                double framepos_sec; // relative to start of file
                double timecode_sec; // timecode
 
                LTCMap (double p, double t) {
                        framepos_sec = p;
                        timecode_sec = t;
                }
        };
 
        LTCFileReader (std::string path, double expected_fps, LTC_TV_STANDARD tv_standard = LTC_TV_FILM_24);
        ~LTCFileReader ();
 
        uint32_t channels () const { return _info.channels; }
        std::vector<LTCMap> read_ltc (uint32_t channel, uint32_t max_frames = 1);
 
private:
        int open();
        void close ();
 
        std::string _path;
 
        double          _expected_fps;
        LTC_TV_STANDARD _ltc_tv_standard;
 
        SNDFILE* _sndfile;
        SF_INFO  _info;
 
        LTCReader*  _reader;
        float*      _interleaved_audio_buffer;
        samplecnt_t _samples_read;
        float       _apv;
 
};
 
} // namespace ARDOUR