get camera frame on Android (PC is ok)

[bigbao]

header file content:
class FilterTestRunnable : public QVideoFilterRunnable
{
private:
FilterTest *m_filter;

//void deleteColorComponentFromYUV(QVideoFrame *input);

public:
FilterTestRunnable(FilterTest *filter) : m_filter(filter) { }
QVideoFrame run(QVideoFrame input, const QVideoSurfaceFormat &surfaceFormat, RunFlags flags);
};
cpp file content:
QVideoFilterRunnable FilterTest::createFilterRunnable()
{
return new FilterTestRunnable(this);
}

QVideoFrame FilterTestRunnable::run(QVideoFrame *input,
const QVideoSurfaceFormat &surfaceFormat,
QVideoFilterRunnable::RunFlags flags)
{
if (!input->isValid())
return *input;

QAbstractVideoBuffer::MapMode mode = input->mapMode();

input->map(QAbstractVideoBuffer::ReadWrite);
    if(input->isReadable()){
        qWarning() << "Is readable!";
    }
    input->unmap();

return *input;

}

problem:
Always print "QVideoFrame::unmap() was called more times then QVideoFrame::map()"
“input->isReadable()” is always false

[SGaist]

Hi and welcome to devnet,

IIRC, on Android the the QVideoFrame contains a texture. You should check the QAbstractVideoBuffer::HandleType of it.

[bigbao]

@SGaist
Thank you very much, I still don't quite understand what I should do, can you give me a simple example?

[bigbao]

@SGaist
did you mean like this:(This is someone else's code, I don't know what it does, and there is the usage of the handleType you mentioned.)
QListQVideoFrame::PixelFormat supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType) const
{
Q_UNUSED(handleType);
return QListQVideoFrame::PixelFormat()
<< QVideoFrame::Format_ARGB32
<< QVideoFrame::Format_ARGB32_Premultiplied
<< QVideoFrame::Format_RGB32
<< QVideoFrame::Format_RGB24
<< QVideoFrame::Format_RGB565
<< QVideoFrame::Format_RGB555
<< QVideoFrame::Format_ARGB8565_Premultiplied
<< QVideoFrame::Format_BGRA32
<< QVideoFrame::Format_BGRA32_Premultiplied
<< QVideoFrame::Format_BGR32
<< QVideoFrame::Format_BGR24
<< QVideoFrame::Format_BGR565
<< QVideoFrame::Format_BGR555
<< QVideoFrame::Format_BGRA5658_Premultiplied
<< QVideoFrame::Format_AYUV444
<< QVideoFrame::Format_AYUV444_Premultiplied
<< QVideoFrame::Format_YUV444
<< QVideoFrame::Format_YUV420P
<< QVideoFrame::Format_YV12
<< QVideoFrame::Format_UYVY
<< QVideoFrame::Format_YUYV
<< QVideoFrame::Format_NV12
<< QVideoFrame::Format_NV21
<< QVideoFrame::Format_IMC1
<< QVideoFrame::Format_IMC2
<< QVideoFrame::Format_IMC3
<< QVideoFrame::Format_IMC4
<< QVideoFrame::Format_Y8
<< QVideoFrame::Format_Y16
<< QVideoFrame::Format_Jpeg
<< QVideoFrame::Format_CameraRaw
<< QVideoFrame::Format_AdobeDng;
}

[SGaist]

No, rather qDebug() << frame.handleType().

In any case, you should take a look at this project which implements a QVideoFilterRunnable which handles video frame also on Android.

[bigbao]

@SGaist
thank you very much.
it's ok. thanks.

[bigbao]

@SGaist
sorry I don't know how to change " UNSOLVED" to " SOLVED"

[VRonin]

@bigbao said in get camera frame on Android (PC is ok):

how to change " UNSOLVED" to " SOLVED"

https://forum.qt.io/topic/71830/hitchhiker-s-visual-guide-to-the-qt-forum

[bigbao]

@SGaist
Hi, in thant code,I want to know supportedViewfinderResolutions of camera,so the main.qml is:

ApplicationWindow {
visible: true
width: 640
height: 480
title: qsTr("My Video Filter")

Camera {
    id: camera
    //viewfinder.resolution: "320x240"
    //viewfinder.resolution: "600x400"
}

VideoOutput {
    id: videoOutput

    anchors.fill: parent

    autoOrientation: true
    source: camera
    filters: [ videoFilter ]
}

MyVideoFilter {
    id: videoFilter

    orientation: videoOutput.orientation
}

MouseArea{
    id: mousearea
    anchors.fill: parent
    onClicked: show_frame_rate()
}

function show_frame_rate()
{
    console.log(camera.viewfinder.resolution)
    console.log(camera.viewfinder.supportedViewfinderResolutions)
    //there is problem:
    /* print
    qml: QSize(-1, -1)
    qml: undefined
     */
}

}

I don't konw why , I can't get :
print info:
qml: QSize(-1, -1)
qml: undefined
is it possible to get those info in my filter:
class MyVideoFilterRunnable : public QVideoFilterRunnable
{
public:
MyVideoFilterRunnable(MyVideoFilter* parent = nullptr);

QVideoFrame run(QVideoFrame *input, const QVideoSurfaceFormat &surfaceFormat, RunFlags flags) Q_DECL_OVERRIDE;
QVideoFrame run(QVideoFrame *input, const QVideoSurfaceFormat &surfaceFormat, RunFlags flags, QImage image);

protected:
MyVideoFilter* m_Filter;
int m_Orientation;
int m_Flip;
};

[SGaist]

The backend might have some limitation there.

Out of curiosity, what do you need these values for ?

[bigbao]

@SGaist
I know these resolutions and choose one of them I need.
thanks