comparison data/fileio/DecodingWavFileReader.h @ 823:f0558e69a074

Rename Resampling- to DecodingWavFileReader, and use it whenever we have an audio file that is not quickly seekable using libsndfile. Avoids very slow performance when analysing ogg files.

+/* -*- 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 _DECODING_WAV_FILE_READER_H_
+#define _DECODING_WAV_FILE_READER_H_
+
+#include "CodedAudioFileReader.h"
+
+#include "base/Thread.h"
+
+#include <set>
+
+class WavFileReader;
+class ProgressReporter;
+
+class DecodingWavFileReader : public CodedAudioFileReader
+{
+    Q_OBJECT
+public:
+    enum ResampleMode {
+        ResampleAtOnce, // resample the file on construction, with progress dialog
+        ResampleThreaded // resample in a background thread after construction
+    };
+
+    DecodingWavFileReader(FileSource source,
+                            ResampleMode resampleMode,
+                            CacheMode cacheMode,
+                            size_t targetRate = 0,
+                            ProgressReporter *reporter = 0);
+    virtual ~DecodingWavFileReader();
+
+    virtual QString getError() const { return m_error; }
+    virtual QString getLocation() const { return m_source.getLocation(); }
+    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();
+    }
+
+public slots:
+    void cancelled();
+
+protected:
+    FileSource m_source;
+    QString m_path;
+    QString m_error;
+    bool m_cancelled;
+    size_t m_processed;
+    int m_completion;
+
+    WavFileReader *m_original;
+    ProgressReporter *m_reporter;
+
+    void addBlock(const SampleBlock &frames);
+    
+    class DecodeThread : public Thread
+    {
+    public:
+        DecodeThread(DecodingWavFileReader *reader) : m_reader(reader) { }
+        virtual void run();
+
+    protected:
+        DecodingWavFileReader *m_reader;
+    };
+
+    DecodeThread *m_decodeThread;
+};
+
+#endif
+