annotate data/fft/FFTFileCacheReader.h @ 1008:d9e0e59a1581

When using an aggregate model to pass data to a transform, zero-pad the shorter input to the duration of the longer rather than truncating the longer. (This is better behaviour for e.g. MATCH, and in any case the code was previously truncating incorrectly and ending up with garbage data at the end.)

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006-2009 Chris Cannam and QMUL.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _FFT_FILE_CACHE_READER_H_
#define _FFT_FILE_CACHE_READER_H_

#include "data/fileio/MatrixFile.h"
#include "FFTCacheReader.h"
#include "FFTCacheStorageType.h"

class FFTFileCacheWriter;

class FFTFileCacheReader : public FFTCacheReader
{
public:
    FFTFileCacheReader(FFTFileCacheWriter *);
    ~FFTFileCacheReader();

    int getWidth() const;
    int getHeight() const;
	
    float getMagnitudeAt(int x, int y) const;
    float getNormalizedMagnitudeAt(int x, int y) const;
    float getMaximumMagnitudeAt(int x) const;
    float getPhaseAt(int x, int y) const;

    void getValuesAt(int x, int y, float &real, float &imag) const;
    void getMagnitudesAt(int x, float *values, int minbin, int count, int step) const;

    bool haveSetColumnAt(int x) const;

    static int getCacheSize(int width, int height,
                               FFTCache::StorageType type);

    FFTCache::StorageType getStorageType() const { return m_storageType; }

protected:
    mutable char *m_readbuf;
    mutable int m_readbufCol;
    mutable int m_readbufWidth;
    mutable bool m_readbufGood;

    float getFromReadBufStandard(int x, int y) const {
        float v;
        if (m_readbuf &&
            (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) {
            v = ((float *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y];
            return v;
        } else {
            populateReadBuf(x);
            v = getFromReadBufStandard(x, y);
            return v;
        }
    }

    float getFromReadBufCompactUnsigned(int x, int y) const {
        float v;
        if (m_readbuf &&
            (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) {
            v = ((uint16_t *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y];
            return v;
        } else {
            populateReadBuf(x);
            v = getFromReadBufCompactUnsigned(x, y);
            return v;
        }
    }

    float getFromReadBufCompactSigned(int x, int y) const {
        float v;
        if (m_readbuf &&
            (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) {
            v = ((int16_t *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y];
            return v;
        } else {
            populateReadBuf(x);
            v = getFromReadBufCompactSigned(x, y);
            return v;
        }
    }

    void populateReadBuf(int x) const;

    float getNormalizationFactor(int col) const {
        int h = m_mfc->getHeight();
        if (h < m_factorSize) return 0;
        if (m_storageType != FFTCache::Compact) {
            return getFromReadBufStandard(col, h - 1);
        } else {
            union {
                float f;
                uint16_t u[2];
            } factor;
            if (!m_readbuf ||
                !(m_readbufCol == col ||
                  (m_readbufWidth > 1 && m_readbufCol+1 == col))) {
                populateReadBuf(col);
            }
            int ix = (col - m_readbufCol) * m_mfc->getHeight() + h;
            factor.u[0] = ((uint16_t *)m_readbuf)[ix - 2];
            factor.u[1] = ((uint16_t *)m_readbuf)[ix - 1];
            return factor.f;
        }
    }
 
    FFTCache::StorageType m_storageType;
    int m_factorSize;
    MatrixFile *m_mfc;
};

#endif