non/Peaks.H

/*******************************************************************************/
/* Copyright (C) 2008 Jonathan Moore Liles                                     */
/*                                                                             */
/* 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; see the file COPYING.  If not,write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
/*******************************************************************************/

#pragma once

#include <stdlib.h>

typedef unsigned long nframes_t;

struct Peak {
    float min;
    float max;
};

class Clip;

class Peaks
{

    struct peakdata {

        int chunksize;                                               /* should always be a power of 2 */
        Peak data[];

    };

    struct peakbuffer {

        size_t size;                                            /* total allocation size */
        size_t len;                                             /* number of peaks  */
        nframes_t offset;                                       /* starting sample */

        peakdata *buf;

        peakbuffer ( )
            {
                size = len = 0;
            }
    };

    static peakbuffer peakbuf;

    Clip *_clip;

    peakdata *_peaks;

    size_t _len;

    void read_peaks ( int s, int e, int npeaks, int chunksize ) const;
    int clip_read_peaks ( Peak *peaks, int npeaks, int chunksize ) const;

    Peak & peak ( nframes_t start, nframes_t end ) const;

public:

    Peaks ( Clip *c )
        {
            _peaks = new peakdata;

            _peaks->chunksize = 0;
            _len = 0;
            _clip = c;
        }

    void fill_buffer ( int s, int e ) const;

    void downsample ( Peak *peaks, int s, int e, float *mhi, float *mlo ) const;
    void read ( int X, float *hi, float *lo ) const;
    bool open ( void );
    float normalization_factor( nframes_t start, nframes_t end ) const;

    bool current ( void ) const;
    bool make_peaks ( int chunksize );

    Peak & operator[] ( int X ) const;

};