view data/fileio/CSVFormat.h @ 1520:954d0cf29ca7 import-audio-data

Switch the normalisation option in WritableWaveFileModel from normalising on read to normalising on write, so that the saved file is already normalised and therefore can be read again without having to remember to normalise it

/* -*- 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 Chris Cannam.
    
    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 SV_CSV_FORMAT_H
#define SV_CSV_FORMAT_H

#include <QString>
#include <QStringList>

#include "base/BaseTypes.h"

class CSVFormat
{
public:
    enum ModelType {
        OneDimensionalModel,
        TwoDimensionalModel,
        TwoDimensionalModelWithDuration,
        TwoDimensionalModelWithDurationAndPitch,
        ThreeDimensionalModel,
        WaveFileModel
    };
    
    enum TimingType {
        ExplicitTiming,
        ImplicitTiming
    };

    enum TimeUnits {
        TimeSeconds,
        TimeMilliseconds,
        TimeAudioFrames,
        TimeWindows,
    };

    enum ColumnPurpose {
        ColumnUnknown,
        ColumnStartTime,
        ColumnEndTime,
        ColumnDuration,
        ColumnValue,
        ColumnPitch,
        ColumnLabel
    };

    enum ColumnQuality {
        ColumnNumeric    = 1,   // No non-numeric values were seen in sample
        ColumnIntegral   = 2,   // All sampled values were integers
        ColumnIncreasing = 4,   // Sampled values were monotonically increasing
        ColumnSmall      = 8,   // All sampled values had magnitude < 1
        ColumnLarge      = 16,  // Values "quickly" grew to over 1000
        ColumnSigned     = 32,  // Some negative values were seen
        ColumnNearEmpty  = 64,  // Nothing in this column beyond first row
    };
    typedef unsigned int ColumnQualities;

    enum AudioSampleRange {
        SampleRangeSigned1 = 0, //     -1 .. 1
        SampleRangeUnsigned255, //      0 .. 255
        SampleRangeSigned32767, // -32768 .. 32767
        SampleRangeOther        // Other/unknown: Normalise on load
    };

    CSVFormat() : // arbitrary defaults
        m_modelType(TwoDimensionalModel),
        m_timingType(ExplicitTiming),
        m_timeUnits(TimeSeconds),
        m_separator(","),
        m_sampleRate(44100),
        m_windowSize(1024),
        m_columnCount(0),
        m_variableColumnCount(false),
        m_audioSampleRange(SampleRangeOther),
        m_allowQuoting(true),
        m_maxExampleCols(0)
    { }

    CSVFormat(QString path); // guess format

    /**
     * Guess the format of the given CSV file, setting the fields in
     * this object accordingly.  If the current separator is the empty
     * string, the separator character will also be guessed; otherwise
     * the current separator will be used.  The other properties of
     * this object will be set according to guesses from the file.
     */
    void guessFormatFor(QString path);
 
    ModelType    getModelType()     const { return m_modelType;     }
    TimingType   getTimingType()    const { return m_timingType;    }
    TimeUnits    getTimeUnits()     const { return m_timeUnits;     }
    sv_samplerate_t getSampleRate() const { return m_sampleRate;    }
    int          getWindowSize()    const { return m_windowSize;    }
    int          getColumnCount()   const { return m_columnCount;   }
    AudioSampleRange getAudioSampleRange() const { return m_audioSampleRange; }
    bool         getAllowQuoting()  const { return m_allowQuoting;  }
    QChar        getSeparator()     const { 
        if (m_separator == "") return ' ';
        else return m_separator[0];
    }

    void setModelType(ModelType t)        { m_modelType    = t; }
    void setTimingType(TimingType t)      { m_timingType   = t; }
    void setTimeUnits(TimeUnits t)        { m_timeUnits    = t; }
    void setSeparator(QChar s)            { m_separator    = s; }
    void setSampleRate(sv_samplerate_t r) { m_sampleRate   = r; }
    void setWindowSize(int s)             { m_windowSize   = s; }
    void setColumnCount(int c)            { m_columnCount  = c; }
    void setAudioSampleRange(AudioSampleRange r) { m_audioSampleRange = r; }
    void setAllowQuoting(bool q)          { m_allowQuoting = q; }

    QList<ColumnPurpose> getColumnPurposes() const { return m_columnPurposes; }
    void setColumnPurposes(QList<ColumnPurpose> cl) { m_columnPurposes = cl; }

    ColumnPurpose getColumnPurpose(int i);
    ColumnPurpose getColumnPurpose(int i) const;
    void setColumnPurpose(int i, ColumnPurpose p);
    
    // read-only; only valid if format has been guessed:
    const QList<ColumnQualities> &getColumnQualities() const {
        return m_columnQualities;
    }

    bool isColumnNumeric(int i) const {
        return (m_columnQualities.size() > i &&
                m_columnQualities[i] & ColumnNumeric);
    }
    
    // read-only; only valid if format has been guessed:
    const QList<QStringList> &getExample() const {
        return m_example;
    }
    
    int getMaxExampleCols() const { return m_maxExampleCols; }
        
protected:
    ModelType    m_modelType;
    TimingType   m_timingType;
    TimeUnits    m_timeUnits;
    QString      m_separator;
    sv_samplerate_t m_sampleRate;
    int          m_windowSize;

    int          m_columnCount;
    bool         m_variableColumnCount;

    QList<ColumnQualities> m_columnQualities;
    QList<ColumnPurpose> m_columnPurposes;

    AudioSampleRange m_audioSampleRange;

    QList<float> m_prevValues;

    bool m_allowQuoting;

    QList<QStringList> m_example;
    int m_maxExampleCols;

    void guessSeparator(QString line);
    void guessQualities(QString line, int lineno);
    void guessPurposes();
    void guessAudioSampleRange();
};

#endif