annotate data/model/DenseTimeValueModel.h @ 363:0e30c8ec15a0

* Add wave file model method for reading more than one channel at once,
  avoiding ludicrously expensive backward seeks and double-reads when
  playing multi-channel files or using them as inputs to feature extraction
  plugins

/* -*- 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 _DENSE_TIME_VALUE_MODEL_H_
#define _DENSE_TIME_VALUE_MODEL_H_

#include <QObject>

#include "Model.h"

/**
 * Base class for models containing dense two-dimensional data (value
 * against time).  For example, audio waveform data.
 */

class DenseTimeValueModel : public Model
{
    Q_OBJECT

public:
    DenseTimeValueModel();

    /**
     * Return the minimum possible value found in this model type.
     * (That is, the minimum that would be valid, not the minimum
     * actually found in a particular model).
     */
    virtual float getValueMinimum() const = 0;

    /**
     * Return the minimum possible value found in this model type.
     * (That is, the minimum that would be valid, not the minimum
     * actually found in a particular model).
     */
    virtual float getValueMaximum() const = 0;

    /**
     * Return the number of distinct channels for this model.
     */
    virtual size_t getChannelCount() const = 0;

    /**
     * Get the specified set of samples from the given channel of the
     * model in single-precision floating-point format.  Return the
     * number of samples actually retrieved.
     * If the channel is given as -1, mix all available channels and
     * return the result.
     */
    virtual size_t getData(int channel, size_t start, size_t count,
                           float *buffer) const = 0;

    /**
     * Get the specified set of samples from the given channel of the
     * model in double-precision floating-point format.  Return the
     * number of samples actually retrieved.
     * If the channel is given as -1, mix all available channels and
     * return the result.
     */
    virtual size_t getData(int channel, size_t start, size_t count,
                           double *buffer) const = 0;

    /**
     * Get the specified set of samples from given contiguous range
     * of channels of the model in single-precision floating-point
     * format.  Return the number of sample frames actually retrieved.
     */
    virtual size_t getData(size_t fromchannel, size_t tochannel,
                           size_t start, size_t count,
                           float **buffers) const = 0;

    QString getTypeName() const { return tr("Dense Time-Value"); }
};

#endif