view data/fileio/WavFileReader.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_WAV_FILE_READER_H
#define SV_WAV_FILE_READER_H

#include "AudioFileReader.h"

#ifdef Q_OS_WIN
#include <windows.h>
#define ENABLE_SNDFILE_WINDOWS_PROTOTYPES 1
#endif

#include <sndfile.h>
#include <QMutex>

#include <set>

/**
 * Reader for audio files using libsndfile.
 *
 * This is typically intended for seekable file types that can be read
 * directly (e.g. WAV, AIFF etc).
 *
 * Compressed files supported by libsndfile (e.g. Ogg, FLAC) should
 * normally be read using DecodingWavFileReader instead (which decodes
 * to an intermediate cached file).
 */
class WavFileReader : public AudioFileReader
{
public:
    enum class Normalisation { None, Peak };

    WavFileReader(FileSource source,
                  bool fileUpdating = false,
                  Normalisation normalise = Normalisation::None);
    virtual ~WavFileReader();

    virtual QString getLocation() const { return m_source.getLocation(); }
    virtual QString getError() const { return m_error; }

    virtual QString getLocalFilename() const { return m_path; }
    
    virtual bool isQuicklySeekable() const { return m_seekable; }
    
    /** 
     * Must be safe to call from multiple threads with different
     * arguments on the same object at the same time.
     */
    virtual floatvec_t getInterleavedFrames(sv_frame_t start, sv_frame_t count)
        const;
    
    static void getSupportedExtensions(std::set<QString> &extensions);
    static bool supportsExtension(QString ext);
    static bool supportsContentType(QString type);
    static bool supports(FileSource &source);

    virtual int getDecodeCompletion() const { return 100; }

    bool isUpdating() const { return m_updating; }

    void updateFrameCount();
    void updateDone();

protected:
    SF_INFO m_fileInfo;
    SNDFILE *m_file;

    FileSource m_source;
    QString m_path;
    QString m_error;

    bool m_seekable;

    mutable QMutex m_mutex;
    mutable floatvec_t m_buffer;
    mutable sv_frame_t m_lastStart;
    mutable sv_frame_t m_lastCount;

    Normalisation m_normalisation;
    float m_max;

    bool m_updating;

    floatvec_t getInterleavedFramesUnnormalised(sv_frame_t start,
                                                sv_frame_t count) const;
    float getMax() const;
};

#endif