1 files changed, 149 insertions, 0 deletions
diff --git a/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.cpp b/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.cpp
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+++ b/src/gui/editors/segment/segmentcanvas/AudioPreviewUpdater.cpp
@@ -0,0 +1,149 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+ 
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <glaurent@telegraph-road.org>,
+        Chris Cannam        <cannam@all-day-breakfast.com>,
+        Richard Bown        <richard.bown@ferventsoftware.com>
+ 
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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.
+*/
+
+
+#include "AudioPreviewUpdater.h"
+
+#include "misc/Debug.h"
+#include "AudioPreviewThread.h"
+#include "base/Composition.h"
+#include "base/RealTime.h"
+#include "base/Segment.h"
+#include "CompositionModelImpl.h"
+#include <qevent.h>
+#include <qobject.h>
+#include <qrect.h>
+
+
+namespace Rosegarden
+{
+
+static int apuExtantCount = 0;
+
+AudioPreviewUpdater::AudioPreviewUpdater(AudioPreviewThread &thread,
+        const Composition& c, const Segment* s,
+        const QRect& r,
+        CompositionModelImpl* parent)
+        : QObject(parent),
+        m_thread(thread),
+        m_composition(c),
+        m_segment(s),
+        m_rect(r),
+        m_showMinima(false),
+        m_channels(0),
+        m_previewToken( -1)
+{
+    ++apuExtantCount;
+    RG_DEBUG << "AudioPreviewUpdater::AudioPreviewUpdater " << this << " (now " << apuExtantCount << " extant)" << endl;
+}
+
+AudioPreviewUpdater::~AudioPreviewUpdater()
+{
+    --apuExtantCount;
+    RG_DEBUG << "AudioPreviewUpdater::~AudioPreviewUpdater on " << this << " ( token " << m_previewToken << ") (now " << apuExtantCount << " extant)" << endl;
+    if (m_previewToken >= 0)
+        m_thread.cancelPreview(m_previewToken);
+}
+
+void AudioPreviewUpdater::update()
+{
+    // Get sample start and end times and work out duration
+    //
+    RealTime audioStartTime = m_segment->getAudioStartTime();
+    RealTime audioEndTime = audioStartTime +
+                            m_composition.getElapsedRealTime(m_segment->getEndMarkerTime()) -
+                            m_composition.getElapsedRealTime(m_segment->getStartTime()) ;
+
+    RG_DEBUG << "AudioPreviewUpdater(" << this << ")::update() - for file id "
+    << m_segment->getAudioFileId() << " requesting values - thread running : "
+    << m_thread.running() << " - thread finished : " << m_thread.finished() << endl;
+
+    AudioPreviewThread::Request request;
+    request.audioFileId = m_segment->getAudioFileId();
+    request.audioStartTime = audioStartTime;
+    request.audioEndTime = audioEndTime;
+    request.width = m_rect.width();
+    request.showMinima = m_showMinima;
+    request.notify = this;
+    if (m_previewToken >= 0)
+        m_thread.cancelPreview(m_previewToken);
+    m_previewToken = m_thread.requestPreview(request);
+    if (!m_thread.running())
+        m_thread.start();
+}
+
+void AudioPreviewUpdater::cancel()
+{
+    if (m_previewToken >= 0)
+        m_thread.cancelPreview(m_previewToken);
+    m_previewToken = -1;
+}
+
+bool AudioPreviewUpdater::event(QEvent *e)
+{
+    RG_DEBUG << "AudioPreviewUpdater(" << this << ")::event (" << e << ")" << endl;
+
+    if (e->type() == AudioPreviewThread::AudioPreviewReady) {
+        QCustomEvent *ev = dynamic_cast<QCustomEvent *>(e);
+        if (ev) {
+            intptr_t token = (intptr_t)ev->data();
+            m_channels = 0; // to be filled as getPreview return value
+
+            RG_DEBUG << "AudioPreviewUpdater::token " << token << ", my token " << m_previewToken << endl;
+
+            if (m_previewToken >= 0 && token >= m_previewToken) {
+
+                m_previewToken = -1;
+                m_thread.getPreview(token, m_channels, m_values);
+
+                if (m_channels == 0) {
+                    RG_DEBUG << "AudioPreviewUpdater: failed to find preview!\n";
+                } else {
+
+                    RG_DEBUG << "AudioPreviewUpdater: got correct preview (" << m_channels
+                    << " channels, " << m_values.size() << " samples)\n";
+                }
+
+                emit audioPreviewComplete(this);
+
+            } else {
+
+                // this one is out of date already
+                std::vector<float> tmp;
+                unsigned int tmpChannels;
+                m_thread.getPreview(token, tmpChannels, tmp);
+
+                RG_DEBUG << "AudioPreviewUpdater: got obsolete preview (" << tmpChannels
+                << " channels, " << tmp.size() << " samples)\n";
+            }
+
+            return true;
+        }
+    }
+
+    return QObject::event(e);
+}
+
+}
+#include "AudioPreviewUpdater.moc"