view data/fileio/ResamplingWavFileReader.h @ 335:02d2ad95ea52 spectrogram-cache-rejig

* Get storage advice for each cache in an FFT data server.  Allows us to be
  more confident about the actual memory situation and cut over from memory
  to disc part way through an FFT calculation if necessary.  StorageAdviser
  is now a bit too optimistic though (it's too keen to allocate large numbers
  of small blocks in memory).

/* -*- 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 2007 QMUL.
    
    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 _RESAMPLING_WAV_FILE_READER_H_
#define _RESAMPLING_WAV_FILE_READER_H_

#include "CodedAudioFileReader.h"

#include "base/Thread.h"

#include <set>

class WavFileReader;
class QProgressDialog;

class ResamplingWavFileReader : public CodedAudioFileReader
{
public:
    enum ResampleMode {
        ResampleAtOnce, // resample the file on construction, with progress dialog
        ResampleThreaded // resample in a background thread after construction
    };

    ResamplingWavFileReader(FileSource source,
                            ResampleMode resampleMode,
                            CacheMode cacheMode,
                            size_t targetRate = 0);
    virtual ~ResamplingWavFileReader();

    virtual QString getError() const { return m_error; }
    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 m_completion; }

    virtual bool isUpdating() const {
        return m_decodeThread && m_decodeThread->isRunning();
    }

protected:
    FileSource m_source;
    QString m_path;
    QString m_error;
    bool m_cancelled;
    size_t m_processed;
    int m_completion;

    WavFileReader *m_original;
    QProgressDialog *m_progress;

    void addBlock(const SampleBlock &frames);
    
    class DecodeThread : public Thread
    {
    public:
        DecodeThread(ResamplingWavFileReader *reader) : m_reader(reader) { }
        virtual void run();

    protected:
        ResamplingWavFileReader *m_reader;
    };

    DecodeThread *m_decodeThread;
};

#endif