mp3fileimportable.h

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/*
 * 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 <stdint.h>
 
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
#include "ardour/importable_source.h"
 
namespace ARDOUR {
 
/* 64bit CPUs always have SSE2, armhf/aarch64 has NEON,
 * except apple/OSX does not provide immintrin.h
 */
#if defined ( __i386__) || defined  (__PPC__) || defined (__APPLE__)
#define MINIMP3_NO_SIMD // disable 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 (bool parse_only = false);
 
        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__ */