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/*
SPDX-FileCopyrightText: 2010 Dirk Vanden Boer <dirk.vdb@gmail.com>
SPDX-FileCopyrightText: 2020 Heiko Schäfer <heiko@rangun.de>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "ffmpegthumbnailer.h"
#include "ffmpegthumbnailersettings5.h"
#include "ffmpegthumbs_debug.h"
#include <limits>
#include <KPluginFactory>
#include <QImage>
extern "C" {
#include <libavformat/avformat.h>
#include <libavutil/dict.h>
#include <libavutil/log.h>
}
namespace {
struct FFmpegLogHandler {
static void handleMessage(void *ptr, int level, const char *fmt, va_list vargs) {
Q_UNUSED(ptr);
const QString message = QString::vasprintf(fmt, vargs);
switch(level) {
case AV_LOG_PANIC: // ffmpeg will crash now
qCCritical(ffmpegthumbs_LOG) << message;
break;
case AV_LOG_FATAL: // fatal as in can't decode, not crash
case AV_LOG_ERROR:
case AV_LOG_WARNING:
qCWarning(ffmpegthumbs_LOG) << message;
break;
case AV_LOG_INFO:
qCInfo(ffmpegthumbs_LOG) << message;
break;
case AV_LOG_VERBOSE:
case AV_LOG_DEBUG:
case AV_LOG_TRACE:
qCDebug(ffmpegthumbs_LOG) << message;
break;
default:
qCWarning(ffmpegthumbs_LOG) << "unhandled log level" << level << message;
break;
}
}
FFmpegLogHandler() {
av_log_set_callback(&FFmpegLogHandler::handleMessage);
}
};
} //namespace
FFMpegThumbnailer::FFMpegThumbnailer(QObject *parent, const QVariantList &args)
: KIO::ThumbnailCreator(parent, args)
{
FFMpegThumbnailerSettings* settings = FFMpegThumbnailerSettings::self();
if (settings->filmstrip()) {
m_Thumbnailer.addFilter(&m_FilmStrip);
}
m_thumbCache.setMaxCost(settings->cacheSize());
}
FFMpegThumbnailer::~FFMpegThumbnailer()
{
}
KIO::ThumbnailResult FFMpegThumbnailer::create(const KIO::ThumbnailRequest &request)
{
int seqIdx = static_cast<int>(request.sequenceIndex());
if (seqIdx < 0) {
seqIdx = 0;
}
QList<int> seekPercentages = FFMpegThumbnailerSettings::sequenceSeekPercentages();
if (seekPercentages.isEmpty()) {
seekPercentages.append(20);
}
// We might have an embedded thumb in the video file, so we have to add 1. This gets corrected
// later if we don't have one.
seqIdx %= static_cast<int>(seekPercentages.size()) + 1;
const QString path = request.url().toLocalFile();
const QString cacheKey = QStringLiteral("%1$%2@%3").arg(path).arg(request.sequenceIndex()).arg(request.targetSize().width());
QImage* cachedImg = m_thumbCache[cacheKey];
if (cachedImg) {
return pass(*cachedImg);
}
// Try reading thumbnail embedded into video file
QByteArray ba = path.toLocal8Bit();
AVFormatContext* ct = avformat_alloc_context();
AVPacket* pic = nullptr;
// No matter the seqIdx, we have to know if the video has an embedded cover, even if we then don't return
// it. We could cache it to avoid repeating this for higher seqIdx values, but this should be fast enough
// to not be noticeable and caching adds unnecessary complexity.
if (ct && !avformat_open_input(&ct,ba.data(), nullptr, nullptr)) {
// Using an priority system based on size or filename (matroska specification) to select the most suitable picture
int bestPrio = 0;
for (size_t i = 0; i < ct->nb_streams; ++i) {
if (ct->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC) {
int prio = 0;
AVDictionaryEntry* fname = av_dict_get(ct->streams[i]->metadata, "filename", nullptr ,0);
if (fname) {
QString filename(QString::fromUtf8(fname->value));
QString noextname = filename.section(QLatin1Char('.'), 0);
// Prefer landscape and larger
if (noextname == QStringLiteral("cover_land")) {
prio = std::numeric_limits<int>::max();
}
else if (noextname == QStringLiteral("small_cover_land")) {
prio = std::numeric_limits<int>::max()-1;
}
else if (noextname == QStringLiteral("cover")) {
prio = std::numeric_limits<int>::max()-2;
}
else if (noextname == QStringLiteral("small_cover")) {
prio = std::numeric_limits<int>::max()-3;
}
else {
prio = ct->streams[i]->attached_pic.size;
}
}
else {
prio = ct->streams[i]->attached_pic.size;
}
if (prio > bestPrio) {
pic = &(ct->streams[i]->attached_pic);
bestPrio = prio;
}
}
}
}
auto res = KIO::ThumbnailResult::fail();
if (pic) {
QImage img;
img.loadFromData(pic->data, pic->size);
res = pass(img);
}
avformat_close_input(&ct);
float wraparoundPoint = 1.0f;
if (!res.image().isNull()) {
// Video file has an embedded thumbnail -> return it for seqIdx=0 and shift the regular
// seek percentages one to the right
res.setSequenceIndexWraparoundPoint(updatedSequenceIndexWraparoundPoint(1.0f));
if (seqIdx == 0) {
return res;
}
seqIdx--;
} else {
wraparoundPoint = updatedSequenceIndexWraparoundPoint(0.0f);
}
// The previous modulo could be wrong now if the video had an embedded thumbnail.
seqIdx %= seekPercentages.size();
m_Thumbnailer.setThumbnailSize(request.targetSize().width());
m_Thumbnailer.setSeekPercentage(seekPercentages[seqIdx]);
//Smart frame selection is very slow compared to the fixed detection
//TODO: Use smart detection if the image is single colored.
//m_Thumbnailer.setSmartFrameSelection(true);
QImage img;
m_Thumbnailer.generateThumbnail(path, img);
if (!img.isNull()) {
// seqIdx 0 will be served from KIO's regular thumbnail cache.
if (static_cast<int>(request.sequenceIndex()) != 0) {
const int cacheCost = static_cast<int>((img.sizeInBytes() + 1023) / 1024);
m_thumbCache.insert(cacheKey, new QImage(img), cacheCost);
}
return pass(img, wraparoundPoint);
}
return KIO::ThumbnailResult::fail();
}
float FFMpegThumbnailer::updatedSequenceIndexWraparoundPoint(float offset)
{
float wraparoundPoint = offset;
if (!FFMpegThumbnailerSettings::sequenceSeekPercentages().isEmpty()) {
wraparoundPoint += FFMpegThumbnailerSettings::sequenceSeekPercentages().size();
} else {
wraparoundPoint += 1.0f;
}
return wraparoundPoint;
}
K_PLUGIN_CLASS_WITH_JSON(FFMpegThumbnailer, "ffmpegthumbs.json")
#include "ffmpegthumbnailer.moc"
#include "moc_ffmpegthumbnailer.cpp"
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