cannot reopen camera twice

tomingliu — Tue, 05 Apr 2016 08:10:16 GMT

Dear All

I am facing a camera problem when using QT5 GUI libraries, pls see my implementation

int Q_DECL_EXPORT txHalInit()
{
    if(!camera) {
        camera = new QCamera(QCameraInfo::defaultCamera());
        if(!camera) return -1;
        cameraViewfinder = new QCameraViewfinder();
        if(!cameraViewfinder) {
            delete camera; return -1;
        }
int Q_DECL_EXPORT txToggleVideo(void)
{
    if(camera) {
        if(isVideoOn == false)
        {
            if(camera->state() == QCamera::UnloadedState) {
                cameraViewfinder->show();
                camera->setViewfinder(cameraViewfinder);
                camera->start();
            }
            cameraViewfinder->setWindowOpacity(1.0);
            isVideoOn = true; return 1;
        }
        else
        {
            cameraViewfinder->hide();
            //cameraViewfinder->setWindowOpacity(0.0);
            camera->stop();camera->unlock(); camera->unload();
            isVideoOn = false; return 0;
        }
    }
    return -1;
}
}

When I try to toggle camera video on and off twice, i get below error, The camera will stop capture video when getting below error

void CameraBinSession::setState(QCamera::State) QCamera::ActiveState
GstElement* CameraBinSession::buildCameraSource()
bool CameraBinSession::setupCameraBin() Viewfinder changed, reconfigure.
Source caps: video/x-raw, format=(string){ I420, NV12, YUY2, UYVY }, width=(int)720, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)interleaved
Supported resolutions: video/x-raw, width=(int)720, height=(int)480
(QSize(720, 480))
Supported rates: video/x-raw, framerate=(fraction)30/1
(QPair(30,1))
====== MP3ENC: 4.0.9 build on Mar 25 2016 16:53:25. ======
(halTests:833): GStreamer-CRITICAL **: gst_element_link_pads_full: assertion 'GST_IS_ELEMENT (src)' failed
(halTests:833): GStreamer-CRITICAL **: gst_object_unref: assertion 'object != NULL' failed
>>>>> fps=0.752219:
GstElement* CameraBinSession::buildCameraSource()
Source caps: video/x-raw, format=(string){ I420, NV12, YUY2, UYVY }, width=(int)720, height=(int)480, framerate=(fraction)30/1, interlace-mode=(string)interleaved
Supported resolutions: video/x-raw, width=(int)720, height=(int)480
(QSize(720, 480))
Supported rates: video/x-raw, framerate=(fraction)30/1
(QPair(30,1))
====== MP3ENC: 4.0.9 build on Mar 25 2016 16:53:25. ======
true
"state changed: old: GST_STATE_NULL  new: GST_STATE_READY  pending: GST_STATE_VOID_PENDING"
[INFO]  Product Info: i.MX6Q/D/S
====== VPUENC: 4.0.9 build on Mar 25 2016 16:53:17. ======
        wrapper: 1.0.65 (VPUWRAPPER_ARM_LINUX Build on Mar 25 2016 16:51:00)
        vpulib: 5.4.33
        firmware: 3.1.1.46072
[INFO]  Product Info: i.MX6Q/D/S
====== VPUENC: 4.0.9 build on Mar 25 2016 16:53:17. ======
        wrapper: 1.0.65 (VPUWRAPPER_ARM_LINUX Build on Mar 25 2016 16:51:00)
        vpulib: 5.4.33
        firmware: 3.1.1.46072
"state changed: old: GST_STATE_READY  new: GST_STATE_PAUSED  pending: GST_STATE_PLAYING"
CameraBin error: "Internal data flow error."
CameraBin error: "Internal data flow error."

who can kindly give me some advice to solve this issue?? appreciate

Regards

Toming

Re: cannot reopen camera twice

joanxie — Fri, 08 Apr 2016 08:47:10 GMT

what bsp do you use? could you give me your test steps? let me reproduce it on my board, and what board and camera do you use?

Re: cannot reopen camera twice

tomingliu — Thu, 19 May 2016 06:31:47 GMT

Here below is my bsp info

BB_VERSION = "1.28.0"

BUILD_SYS = "x86_64-linux"

NATIVELSBSTRING = "Fedora-18"

TARGET_SYS = "arm-tanxun-linux-gnueabi"

MACHINE = "imx6qsabresd"

DISTRO = "fsl-imx-fb"

DISTRO_VERSION = "4.1.15-1.1.0"

TUNE_FEATURES = "arm armv7a vfp neon callconvention-hard cortexa9"

TARGET_FPU = "vfp-neon"

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