annotate data/fileio/WavFileWriter.h @ 875:3e6ed8a8577b tonioni

Use a sparse time-value model only for outputs with fixed bin count of 1, not for those with unknown bin count.
(Precursor to using more than one model for outputs with unknown bin count)

/* -*- 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 _WAV_FILE_WRITER_H_
#define _WAV_FILE_WRITER_H_

#include <QString>

#include <sndfile.h>

class DenseTimeValueModel;
class MultiSelection;
class TempWriteFile;

class WavFileWriter
{
public:
    /**
     * Specify the method used to open the destination file.
     * 
     * If WriteToTemporary, the destination will be opened as a
     * temporary file which is moved to the target location when the
     * WavFileWriter is closed or deleted (to avoid clobbering an
     * existing file with a partially written replacement).
     * 
     * If WriteToTarget, the target file will be opened directly
     * (necessary when e.g. doing a series of incremental writes to a
     * file while keeping it open for reading).
     */
    enum FileWriteMode {
        WriteToTemporary,
        WriteToTarget
    };

    WavFileWriter(QString path, size_t sampleRate, size_t channels,
                  FileWriteMode mode);
    virtual ~WavFileWriter();

    bool isOK() const;

    virtual QString getError() const;

    QString getPath() const { return m_path; }

    bool writeModel(DenseTimeValueModel *source,
                    MultiSelection *selection = 0);

    bool writeSamples(float **samples, size_t count); // count per channel

    bool close();

protected:
    QString m_path;
    size_t m_sampleRate;
    size_t m_channels;
    TempWriteFile *m_temp;
    SNDFILE *m_file;
    QString m_error;

    QString getWriteFilename() const;
};


#endif