Adding a VideoClipWorkflow class

src/Workflow/VideoClipWorkflow.cpp

+/*****************************************************************************
+ * VideoClipWorkflow.cpp : Clip workflow. Will extract a single frame from a VLCMedia
+ *****************************************************************************
+ * Copyright (C) 2008-2009 the VLMC team
+ *
+ * Authors: Hugo Beauzee-Luyssen <hugo@vlmc.org>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#include "VideoClipWorkflow.h"
+
+VideoClipWorkflow::VideoClipWorkflow( Clip* clip ) : ClipWorkflow( clip )
+{
+}
+
+void*       VideoClipWorkflow::getLockCallback()
+{
+    return reinterpret_cast<void*>(&VideoClipWorkflow::lock);
+}
+
+void*       VideoClipWorkflow::getUnlockCallback()
+{
+    return reinterpret_cast<void*>( &VideoClipWorkflow::unlock );
+}
+
+void    VideoClipWorkflow::lock( VideoClipWorkflow* cw, void** pp_ret, int size )
+{
+    Q_UNUSED( size );
+    cw->m_renderLock->lock();
+    *pp_ret = cw->m_buffer;
+//    qDebug() << '[' << (void*)cw << "] ClipWorkflow::lock";
+}
+
+void    VideoClipWorkflow::unlock( VideoClipWorkflow* cw, void* buffer, int width, int height, int bpp, int size )
+{
+    Q_UNUSED( buffer );
+    Q_UNUSED( width );
+    Q_UNUSED( height );
+    Q_UNUSED( bpp );
+    Q_UNUSED( size );
+    cw->m_renderLock->unlock();
+    cw->m_stateLock->lockForWrite();
+
+    if ( cw->m_state == Rendering )
+    {
+        QMutexLocker    lock( cw->m_condMutex );
+
+        cw->m_state = Sleeping;
+        cw->m_stateLock->unlock();
+
+        {
+            QMutexLocker    lock2( cw->m_renderWaitCond->getMutex() );
+            cw->m_renderWaitCond->wake();
+        }
+        cw->emit renderComplete( cw );
+//        qDebug() << "Emmiting render completed";
+
+//        qDebug() << "Entering cond wait";
+        cw->m_waitCond->wait( cw->m_condMutex );
+//        qDebug() << "Leaving condwait";
+        cw->m_stateLock->lockForWrite();
+        if ( cw->m_state == Sleeping )
+            cw->m_state = Rendering;
+        cw->m_stateLock->unlock();
+    }
+    else
+        cw->m_stateLock->unlock();
+//    qDebug() << '[' << (void*)cw << "] ClipWorkflow::unlock";
+    cw->checkStateChange();
+}

src/Workflow/VideoClipWorkflow.h

+/*****************************************************************************
+ * VideoClipWorkflow.h : Clip workflow. Will extract a single frame from a VLCMedia
+ *****************************************************************************
+ * Copyright (C) 2008-2009 the VLMC team
+ *
+ * Authors: Hugo Beauzee-Luyssen <hugo@vlmc.org>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef VIDEOCLIPWORKFLOW_H
+#define VIDEOCLIPWORKFLOW_H
+
+#include "ClipWorkflow.h"
+#include "Clip.h"
+
+class   VideoClipWorkflow : public ClipWorkflow
+{
+    public:
+        VideoClipWorkflow( Clip* clip );
+        void*                   getLockCallback();
+        void*                   getUnlockCallback();
+
+    private:
+        static void             lock( VideoClipWorkflow* clipWorkflow, void** pp_ret, int size );
+        static void             unlock( VideoClipWorkflow* clipWorkflow, void* buffer, int width, int height, int bpp, int size );
+};
+
+#endif // VIDEOCLIPWORKFLOW_H