Restructure the source code a little.

Change-Id: I995b0fb33bdda7f01bf6266c1c50a1b17eba6760
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>

src/multimedia/audio/qsamplecache_p.h

@@ -0,0 +1,161 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSAMPLECACHE_P_H
+#define QSAMPLECACHE_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qobject.h>
+#include <QtCore/qthread.h>
+#include <QtCore/qurl.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qmap.h>
+#include <QtCore/qset.h>
+#include <qaudioformat.h>
+
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Multimedia)
+
+
+class QNetworkAccessManager;
+class QSampleCache;
+class QWaveDecoder;
+
+// Lives in application thread
+class QSample : public QObject
+{
+    Q_OBJECT
+public:
+    friend class QSampleCache;
+    enum State
+    {
+        Creating,
+        Loading,
+        Error,
+        Ready,
+    };
+
+    State state() const;
+    // These are not (currently) locked because they are only meant to be called after these
+    // variables are updated to their final states
+    const QByteArray& data() const { Q_ASSERT(state() == Ready); return m_soundData; }
+    const QAudioFormat& format() const { Q_ASSERT(state() == Ready); return m_audioFormat; }
+    void release();
+
+Q_SIGNALS:
+    void error();
+    void ready();
+
+protected:
+    QSample(const QUrl& url, QSampleCache *parent);
+
+private Q_SLOTS:
+    void load();
+    void decoderError();
+    void readSample();
+    void decoderReady();
+
+private:
+    void onReady();
+    void cleanup();
+    void addRef();
+    void loadIfNecessary();
+    QSample();
+    ~QSample();
+
+    mutable QMutex m_mutex;
+    QSampleCache *m_parent;
+    QByteArray   m_soundData;
+    QAudioFormat m_audioFormat;
+    QIODevice    *m_stream;
+    QWaveDecoder *m_waveDecoder;
+    QUrl         m_url;
+    qint64       m_sampleReadLength;
+    State        m_state;
+    int          m_ref;
+};
+
+class QSampleCache
+{
+public:
+    friend class QSample;
+
+    QSampleCache();
+    ~QSampleCache();
+
+    QSample* requestSample(const QUrl& url);
+    void setCapacity(qint64 capacity);
+
+private:
+    QMap<QUrl, QSample*> m_samples;
+    QSet<QSample*> m_staleSamples;
+    QNetworkAccessManager *m_networkAccessManager;
+    QMutex m_mutex;
+    qint64 m_capacity;
+    qint64 m_usage;
+    QThread m_loadingThread;
+
+    QNetworkAccessManager& networkAccessManager();
+    void refresh(qint64 usageChange);
+    bool notifyUnreferencedSample(QSample* sample);
+    void removeUnreferencedSample(QSample* sample);
+    void unloadSample(QSample* sample);
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QSAMPLECACHE_P_H