#include?“histogramwidget.h“
#include?

?HistogramWidget::HistogramWidget（QWidget?*parent）
????:?QWidget（parent）
?????m_levels（128）
?????m_isBusy（false）
{
????m_processor.moveToThread（&m_processorThread）;
????qRegistermetaType?>（“QVector“）;
????connect（&m_processor?SIGNAL（histogramReady（QVector））?SLOT（setHistogram（QVector）））;
????m_processorThread.start（QThread::LowestPriority）;
}

HistogramWidget::~HistogramWidget（）
{
????m_processorThread.quit（）;
????m_processorThread.wait（10000）;
}

void?HistogramWidget::processframe（QVideoframe?frame）
{
????if?（m_isBusy）
????????return;?//drop?frame

????m_isBusy?=?true;
????Qmetaobject::invokeMethod（&m_processor?“processframe“
??????????????????????????????Qt::QueuedConnection?Q_ARG（QVideoframe?frame）?Q_ARG（int?m_levels））;
}

void?HistogramWidget::setHistogram（QVector?histogram）
{
????m_isBusy?=?false;
????m_histogram?=?histogram;
????update（）;
}

void?HistogramWidget::paintEvent（QPaintEvent?*event）
{
????Q_UNUSED（event）;

????QPainter?painter（this）;

????if?（m_histogram.isEmpty（））?{
????????painter.fillRect（0?0?width（）?height（）?QColor::fromRgb（0?0?0））;
????????return;
????}

????qreal?barWidth?=?width（）?/?（qreal）m_histogram.size（）;

????for?（int?i?=?0;?i?????????qreal?h?=?m_histogram[i]?*?height（）;
????????//?draw?level
????????painter.fillRect（barWidth?*?i?height（）?-?h?barWidth?*?（i?+?1）?height（）?Qt::red）;
????????//?clear?the?rest?of?the?control
????????painter.fillRect（barWidth?*?i?0?barWidth?*?（i?+?1）?height（）?-?h?Qt::black）;
????}
}

void?frameProcessor::processframe（QVideoframe?frame?int?levels）
{
????QVector?histogram（levels）;

????do?{
????????if?（!levels）
????????????break;

????????if?（!frame.map（QAbstractVideoBuffer::ReadOnly））
????????????break;

????????if?（frame.pixelFormat（）?==?QVideoframe::Format_YUV420P?||
????????????frame.pixelFormat（）?==?QVideoframe::Format_NV12）?{
????????????//?Process?YUV?data
????????????uchar?*b?=?frame.bits（）;
????????????for?（int?y?=?0;?y?ame.height（）;?y++）?{
????????????????uchar?*lastPixel?=?b?+?frame.width（）;
????????????????for?（uchar?*curPixel?=?b;?curPixel?????????????????????histogram[（*curPixel?*?levels）?>>?8]?+=?1.0;
????????????????b?+=?frame.bytesPerLine（）;
????????????}
????????}?else?{
????????????QImage::Format?imageFormat?=?QVideoframe::imageFormatFromPixelFormat（frame.pixelFormat（））;
????????????if?（imageFormat?!=?QImage::Format_Invalid）?{
????????????????//?Process?RGB?data
????????????????QImage?image（frame.bits（）?frame.width（）?frame.height（）?imageFormat）;
????????????????image?=?image.convertToFormat（QImage::Format_RGB32）;

????????????????const?QRgb*?b?=?（const?QRgb*）image.bits（）;
????????????????for?（int?y?=?0;?y?????????????????????const?QRgb?*lastPixel?=?b?+?frame.width（）;
??????????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-01-05?16:33??mediaplayer\
?????文件????????3718??2018-01-05?15:40??mediaplayer\histogramwidget.cpp
?????文件?????????931??2018-01-04?16:46??mediaplayer\histogramwidget.h
?????文件????????3717??2018-01-04?16:05??mediaplayer\histogramwidgetcpp.cpp
?????文件?????????165??2018-01-04?15:55??mediaplayer\histogramwidgetcpp.h
?????文件????????1155??2018-01-04?16:53??mediaplayer\main.cpp
?????文件?????????643??2018-01-04?16:46??mediaplayer\mediaplayer.pro
?????文件???????23809??2018-01-05?16:17??mediaplayer\mediaplayer.pro.user
?????文件???????13621??2018-01-04?16:51??mediaplayer\player.cpp
?????文件????????2066??2018-01-04?16:16??mediaplayer\player.h
?????文件????????4552??2018-01-04?16:05??mediaplayer\playercontrols.cpp
?????文件????????1307??2018-01-04?16:16??mediaplayer\playercontrols.h
?????文件????????4552??2018-01-04?16:05??mediaplayer\playercontrolscpp.cpp
?????文件?????????160??2018-01-04?15:57??mediaplayer\playercontrolscpp.h
?????文件???????13619??2018-01-04?16:05??mediaplayer\playercpp.cpp
?????文件?????????120??2018-01-04?15:56??mediaplayer\playercpp.h
?????文件????????3403??2018-01-04?16:51??mediaplayer\playerlistmodel.cpp
?????文件????????1265??2018-01-04?16:16??mediaplayer\playerlistmodel.h
?????文件????????1052??2018-01-04?17:09??mediaplayer\videowidget.cpp
?????文件?????????377??2018-01-04?16:19??mediaplayer\videowidget.h
?????文件?????????114??2018-01-04?15:48??mediaplayer\widget.cpp
?????文件?????????195??2018-01-04?15:48??mediaplayer\widget.h