1 /***************************************************************************
2 Copyright (C) 2006-2008
3 by Marco Gulino <marco@kmobiletools.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19 ***************************************************************************/
21 #include "westleypreview.h"
25 #include <QtCore/QVarLengthArray>
27 #include <kstandarddirs.h>
28 #include <krandomsequence.h>
29 #include <qdatetime.h>
34 #include <qfileinfo.h>
35 #include <KTemporaryFile>
45 KDE_EXPORT ThumbCreator *new_creator() {
46 return new WestleyPreview;
50 WestleyPreview::WestleyPreview()
51 : m_rand(0), m_inigoprocess(0)
55 WestleyPreview::~WestleyPreview()
58 delete m_inigoprocess;
61 bool WestleyPreview::startAndWaitProcess(const QStringList &args)
63 kDebug(DBG_AREA) << "westleypreview: starting process with args: " << args << endl;
64 m_inigoprocess->start(args.join(" "));
65 if (! m_inigoprocess->waitForStarted()) {
66 kDebug(DBG_AREA) << "westleypreview: PROCESS NOT STARTED!!! exiting\n";
69 if (! m_inigoprocess->waitForFinished()) {
70 kDebug(DBG_AREA) << "westleypreview: PROCESS DIDN'T FINISH!! exiting\n";
71 m_inigoprocess->close();
74 kDebug() << "westleypreview: process started and ended correctly\n";
78 bool WestleyPreview::create(const QString &path, int width, int /*height*/, QImage &img)
81 playerBin = KStandardDirs::findExe("inigo");
82 if (playerBin.isEmpty()) {
83 kDebug(DBG_AREA) << "westleypreview: inigo not found, exiting.\n";
90 m_rand = new KRandomSequence(QDateTime::currentDateTime().toTime_t());
91 m_inigoprocess = new QProcess();
93 kDebug(DBG_AREA) << "videopreview: url=" << furl << "; local:" << furl.isLocalFile() << endl;
94 fileinfo.towidth = width;
95 fileinfo.toheight = width * 3 / 4;
97 // if(furl.isLocalFile())
100 //TODO: modify inigo so that it can return some infos about a westley clip (duration, track number,fps,...)
101 // without actually playing the file
103 args << playerBin << QString("\"" + path + "\"") << "-file-info";
105 kDebug(DBG_AREA) << "videopreview: starting process: --_" << " " << args.join(" ") << "_--\n";
106 if (! startAndWaitProcess(args) ) return NULL;
108 QString information=QString(inigoprocess->readAllStandardOutput() );
109 QRegExp findInfos("ID_VIDEO_FPS=([\\d]*).*ID_LENGTH=([\\d]*).*");
110 if(findInfos.indexIn( information) == -1 )
112 kDebug(DBG_AREA) << "videopreview: No information found, exiting\n";
115 fileinfo.seconds =findInfos.cap(2).toInt();
116 fileinfo.fps=findInfos.cap(1).toInt();
118 fileinfo.seconds = 250;
121 const int LASTTRY = 3;
122 for (int i = 0; i <= LASTTRY; i++) {
123 pix = getFrame(path);
125 uint variance = imageVariance(pix);
126 kDebug(DBG_AREA) << "videopreview: " << QFileInfo(path).fileName() << " frame variance: " << variance << "; " <<
127 ((variance <= 40 && (i != LASTTRY - 1)) ? "!!!DROPPING!!!" : "GOOD :-)") << endl;
128 if (variance > 40 || i == LASTTRY - 1) break;
135 if (pix.depth() != 32)
136 img = pix.convertToFormat(QImage::Format_RGB32);
141 QImage WestleyPreview::getFrame(const QString &path)
144 const int START = 25;
145 const int RANGE = 500;
147 args << playerBin << "\"" + path + "\"";
149 unsigned long start = (unsigned long)(START + (m_rand->getDouble() * RANGE));
150 args << QString("in=%1").arg(start) << QString("out=%1").arg(start) << "-consumer";
153 temp.setSuffix(".png");
155 args << QString("avformat:%1").arg(temp.fileName()) << "vframes=1" << "f=rawvideo" << "vcodec=png" << QString("s=%1x%2").arg(fileinfo.towidth).arg(fileinfo.toheight);
156 if (! startAndWaitProcess(args)) return QImage();
157 QImage retpix(temp.fileName());
163 uint WestleyPreview::imageVariance(QImage image)
167 uint bytes = image.numBytes();
168 uint STEPS = bytes / 2;
169 QVarLengthArray<uchar> pivot(STEPS);
170 kDebug(DBG_AREA) << "Using " << STEPS << " steps\n";
171 uchar *bits = image.bits();
172 // First pass: get pivots and taking average
173 for (uint i = 0; i < STEPS ; i++) {
174 pivot[i] = bits[i*(bytes/STEPS)];
178 // Second Step: calculate delta (average?)
179 for (uint i = 0; i < STEPS; i++) {
180 int curdelta = abs(int(avg - pivot[i]));
183 return delta / STEPS;
186 ThumbCreator::Flags WestleyPreview::flags() const
192 #include "westleypreview.moc"