annotate data/fileio/WavFileWriter.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 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, int sampleRate, int 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, int count); // count per channel

    bool close();

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

    QString getWriteFilename() const;
};


#endif