comparison data/fileio/ResamplingWavFileReader.h @ 297:c022976d18e8

* Merge from sv-match-alignment branch (excluding alignment-specific document).
  - add aggregate wave model (not yet complete enough to be added as a true
    model in a layer, but there's potential)
  - add play solo mode
  - add alignment model -- unused in plain SV
  - fix two plugin leaks
  - add m3u playlist support (opens all files at once, potentially hazardous)
  - fix retrieval of pre-encoded URLs
  - add ability to resample audio files on import, so as to match rates with
    other files previously loaded; add preference for same
  - add preliminary support in transform code for range and rate of transform
    input
  - reorganise preferences dialog, move dark-background option to preferences,
    add option for temporary directory location

+/* -*- 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(QString path,
+                            ResampleMode resampleMode,
+                            CacheMode cacheMode,
+                            size_t targetRate = 0);
+    virtual ~ResamplingWavFileReader();
+
+    virtual QString getError() const { return m_error; }
+
+    static void getSupportedExtensions(std::set<QString> &extensions);
+
+    virtual int getDecodeCompletion() const { return m_completion; }
+
+    virtual bool isUpdating() const {
+        return m_decodeThread && m_decodeThread->isRunning();
+    }
+
+protected:
+    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
+