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Any example to use libcamera for Qt5 desktop application?

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  • SGaistS SGaist

    What if you start the application without Qt Creator running at the same time ?

    R Offline
    R Offline
    rollyng
    wrote on last edited by
    #7

    @SGaist
    Hi, these are the error message produced in Qt Creator.
    09:37:40: Starting /home/pi/code/libcamera-qt5/build-camera-Desktop-Release/camera ...
    Unable to query the parameter info: QCameraImageProcessingControl::WhiteBalancePreset : "Inappropriate ioctl for device"
    Unable to query the parameter info: QCameraImageProcessingControl::ColorTemperature : "Inappropriate ioctl for device"
    Unable to query the parameter info: QCameraImageProcessingControl::ContrastAdjustment : "Inappropriate ioctl for device"
    Unable to query the parameter info: QCameraImageProcessingControl::SaturationAdjustment : "Inappropriate ioctl for device"
    Unable to query the parameter info: QCameraImageProcessingControl::BrightnessAdjustment : "Inappropriate ioctl for device"
    Unable to query the parameter info: QCameraImageProcessingControl::SharpeningAdjustment : "Inappropriate ioctl for device"
    CameraBin error: "Failed to allocate required memory."
    09:38:34: /home/pi/code/libcamera-qt5/build-camera-Desktop-Release/camera exited with code 0
    2022-07-06-094130_1920x1080_scrot.png

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #8

      Which version of Qt are you using on your Pi ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      R 1 Reply Last reply
      0
      • SGaistS SGaist

        Which version of Qt are you using on your Pi ?

        R Offline
        R Offline
        rollyng
        wrote on last edited by
        #9

        @SGaist said in Any example to use libcamera for Qt5 desktop application?:

        Which version of Qt are you using on your Pi ?

        2022-07-07-055749_1920x1080_scrot.png

        JonBJ jsulmJ 2 Replies Last reply
        0
        • R rollyng

          @SGaist said in Any example to use libcamera for Qt5 desktop application?:

          Which version of Qt are you using on your Pi ?

          2022-07-07-055749_1920x1080_scrot.png

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #10

          @rollyng
          Which version of Qt have you installed, not which version of Qt Creator?

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          • R rollyng

            @SGaist said in Any example to use libcamera for Qt5 desktop application?:

            Which version of Qt are you using on your Pi ?

            2022-07-07-055749_1920x1080_scrot.png

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #11

            @rollyng Please, the Qt version mentioned in "About Qt Creator" dialog only tells what Qt version was used to build QtCreator, not what Qt version you're using to build your app!

            https://forum.qt.io/topic/113070/qt-code-of-conduct

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            • R Offline
              R Offline
              rollyng
              wrote on last edited by
              #12

              2022-07-07-233556_1920x1080_scrot.png

              Sorry folks, please take a look. Thanks

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #13

                Depending on your application goal, you can use a custom GStreamer pipeline.

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                • SGaistS SGaist

                  Depending on your application goal, you can use a custom GStreamer pipeline.

                  R Offline
                  R Offline
                  rollyng
                  wrote on last edited by
                  #14

                  @SGaist said in Any example to use libcamera for Qt5 desktop application?:

                  Depending on your application goal, you can use a custom GStreamer pipeline.

                  Hi SGaist, I would like to show the real-time image in a Qt application for preview. May I know how can I modify the camera example to do that? How can I add the GStreamer pipeline to the camera example? Thank you.

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                  • R Offline
                    R Offline
                    rollyng
                    wrote on last edited by
                    #15

                    Hi SGaist,
                    I have also take a look at the libcamera examples. There is the "qcam" code which made use of Qt but it is not a GUI application from my understanding.
                    link text
                    Do you suggest that I can implement the "qcam" example into Qt Creator for my application? How can I start with such?
                    Thanks,
                    rolly

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                    0
                    • JoeCFDJ Offline
                      JoeCFDJ Offline
                      JoeCFD
                      wrote on last edited by JoeCFD
                      #16

                      You can try to use qt gstreamer to add your pipeline. Gstreamer with lower versions has pretty large memory leaks when camera is switched. If you do not switch camera often, it is ok. But it is better to install 1.20 or above in your machine. Build Qt Gstreamer with Qt 5.15.2 and higher version of gstreamer. Qt gstreamer has some examples for how to make pipelines. If you have any issues in build, post them here.

                      https://gstreamer.freedesktop.org/data/doc/gstreamer/head/qt-gstreamer/html/annotated.html

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #17

                        If memory serves well, Qt Creator has support for meson however yours might be too old.

                        Otherwise you can generate a minimal .pro file using qmake -project.

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                        R 1 Reply Last reply
                        0
                        • SGaistS SGaist

                          If memory serves well, Qt Creator has support for meson however yours might be too old.

                          Otherwise you can generate a minimal .pro file using qmake -project.

                          R Offline
                          R Offline
                          rollyng
                          wrote on last edited by
                          #18

                          @SGaist said in Any example to use libcamera for Qt5 desktop application?:

                          If memory serves well, Qt Creator has support for meson however yours might be too old.

                          Otherwise you can generate a minimal .pro file using qmake -project.

                          Hi SGaist, thank you and I did that. Now I can open the libcamera project in Qt Creator. But some of the Qt include definitions are missing? Please take a look.
                          #include <QComboBox> for example?

                          By the way, How can I build and run qcam in Qt Creator? Simple compilation failed at once.

                          02:00:30: Running steps for project libcamera...
                          02:00:30: Starting: "/usr/lib/qt5/bin/qmake" /home/pi/code/libcamera/libcamera.pro -spec linux-g++ CONFIG+=qtquickcompiler
                          Info: creating stash file /home/pi/code/build-libcamera-Desktop-Release/.qmake.stash
                          02:00:31: The process "/usr/lib/qt5/bin/qmake" exited normally.
                          02:00:31: Starting: "/usr/bin/make" -f /home/pi/code/build-libcamera-Desktop-Release/Makefile qmake_all
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1750: warning: overriding recipe for target 'main.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1674: warning: ignoring old recipe for target 'main.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1793: warning: overriding recipe for target 'delayed_controls.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1476: warning: ignoring old recipe for target 'delayed_controls.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1805: warning: overriding recipe for target 'fence.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1488: warning: ignoring old recipe for target 'fence.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1817: warning: overriding recipe for target 'geometry.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1497: warning: ignoring old recipe for target 'geometry.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1912: warning: overriding recipe for target 'main.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1750: warning: ignoring old recipe for target 'main.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2078: warning: overriding recipe for target 'controls.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1790: warning: ignoring old recipe for target 'controls.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2087: warning: overriding recipe for target 'formats.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1808: warning: ignoring old recipe for target 'formats.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2106: warning: overriding recipe for target 'camera3_hal.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1563: warning: ignoring old recipe for target 'camera3_hal.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2133: warning: overriding recipe for target 'camera_metadata.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1597: warning: ignoring old recipe for target 'camera_metadata.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2270: warning: overriding recipe for target 'ipa_context.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2171: warning: ignoring old recipe for target 'ipa_context.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2301: warning: overriding recipe for target 'file.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1491: warning: ignoring old recipe for target 'file.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2304: warning: overriding recipe for target 'flags.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1494: warning: ignoring old recipe for target 'flags.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2310: warning: overriding recipe for target 'message.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1506: warning: ignoring old recipe for target 'message.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2316: warning: overriding recipe for target 'object.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1515: warning: ignoring old recipe for target 'object.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2325: warning: overriding recipe for target 'signal.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1530: warning: ignoring old recipe for target 'signal.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2331: warning: overriding recipe for target 'timer.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1542: warning: ignoring old recipe for target 'timer.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2337: warning: overriding recipe for target 'utils.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:1548: warning: ignoring old recipe for target 'utils.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2382: warning: overriding recipe for target 'algorithm.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2182: warning: ignoring old recipe for target 'algorithm.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2395: warning: overriding recipe for target 'histogram.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2188: warning: ignoring old recipe for target 'histogram.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2402: warning: overriding recipe for target 'agc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2363: warning: ignoring old recipe for target 'agc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2406: warning: overriding recipe for target 'awb.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2367: warning: ignoring old recipe for target 'awb.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2410: warning: overriding recipe for target 'blc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2371: warning: ignoring old recipe for target 'blc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2424: warning: overriding recipe for target 'ipu3.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2179: warning: ignoring old recipe for target 'ipu3.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2431: warning: overriding recipe for target 'raspberrypi.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2267: warning: ignoring old recipe for target 'raspberrypi.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2437: warning: overriding recipe for target 'rkisp1.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2277: warning: ignoring old recipe for target 'rkisp1.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2452: warning: overriding recipe for target 'vimc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2280: warning: ignoring old recipe for target 'vimc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2466: warning: overriding recipe for target 'agc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2402: warning: ignoring old recipe for target 'agc.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2488: warning: overriding recipe for target 'awb.o'
                          /home/pi/code/build-libcamera-Desktop-Release/Makefile:2406: warning: ignoring old recipe for target 'awb.o'
                          make: Nothing to be done for 'qmake_all'.
                          02:00:31: The process "/usr/bin/make" exited normally.
                          02:00:31: Starting: "/usr/bin/make" -j4
                          Makefile:1750: warning: overriding recipe for target 'main.o'
                          Makefile:1674: warning: ignoring old recipe for target 'main.o'
                          Makefile:1793: warning: overriding recipe for target 'delayed_controls.o'
                          Makefile:1476: warning: ignoring old recipe for target 'delayed_controls.o'
                          Makefile:1805: warning: overriding recipe for target 'fence.o'
                          Makefile:1488: warning: ignoring old recipe for target 'fence.o'
                          Makefile:1817: warning: overriding recipe for target 'geometry.o'
                          Makefile:1497: warning: ignoring old recipe for target 'geometry.o'
                          Makefile:1912: warning: overriding recipe for target 'main.o'
                          Makefile:1750: warning: ignoring old recipe for target 'main.o'
                          Makefile:2078: warning: overriding recipe for target 'controls.o'
                          Makefile:1790: warning: ignoring old recipe for target 'controls.o'
                          Makefile:2087: warning: overriding recipe for target 'formats.o'
                          Makefile:1808: warning: ignoring old recipe for target 'formats.o'
                          Makefile:2106: warning: overriding recipe for target 'camera3_hal.o'
                          Makefile:1563: warning: ignoring old recipe for target 'camera3_hal.o'
                          Makefile:2133: warning: overriding recipe for target 'camera_metadata.o'
                          Makefile:1597: warning: ignoring old recipe for target 'camera_metadata.o'
                          Makefile:2270: warning: overriding recipe for target 'ipa_context.o'
                          Makefile:2171: warning: ignoring old recipe for target 'ipa_context.o'
                          Makefile:2301: warning: overriding recipe for target 'file.o'
                          Makefile:1491: warning: ignoring old recipe for target 'file.o'
                          Makefile:2304: warning: overriding recipe for target 'flags.o'
                          Makefile:1494: warning: ignoring old recipe for target 'flags.o'
                          Makefile:2310: warning: overriding recipe for target 'message.o'
                          Makefile:1506: warning: ignoring old recipe for target 'message.o'
                          Makefile:2316: warning: overriding recipe for target 'object.o'
                          Makefile:1515: warning: ignoring old recipe for target 'object.o'
                          Makefile:2325: warning: overriding recipe for target 'signal.o'
                          Makefile:1530: warning: ignoring old recipe for target 'signal.o'
                          Makefile:2331: warning: overriding recipe for target 'timer.o'
                          Makefile:1542: warning: ignoring old recipe for target 'timer.o'
                          Makefile:2337: warning: overriding recipe for target 'utils.o'
                          Makefile:1548: warning: ignoring old recipe for target 'utils.o'
                          Makefile:2382: warning: overriding recipe for target 'algorithm.o'
                          Makefile:2182: warning: ignoring old recipe for target 'algorithm.o'
                          Makefile:2395: warning: overriding recipe for target 'histogram.o'
                          Makefile:2188: warning: ignoring old recipe for target 'histogram.o'
                          Makefile:2402: warning: overriding recipe for target 'agc.o'
                          Makefile:2363: warning: ignoring old recipe for target 'agc.o'
                          Makefile:2406: warning: overriding recipe for target 'awb.o'
                          Makefile:2367: warning: ignoring old recipe for target 'awb.o'
                          Makefile:2410: warning: overriding recipe for target 'blc.o'
                          Makefile:2371: warning: ignoring old recipe for target 'blc.o'
                          Makefile:2424: warning: overriding recipe for target 'ipu3.o'
                          Makefile:2179: warning: ignoring old recipe for target 'ipu3.o'
                          Makefile:2431: warning: overriding recipe for target 'raspberrypi.o'
                          Makefile:2267: warning: ignoring old recipe for target 'raspberrypi.o'
                          Makefile:2437: warning: overriding recipe for target 'rkisp1.o'
                          Makefile:2277: warning: ignoring old recipe for target 'rkisp1.o'
                          Makefile:2452: warning: overriding recipe for target 'vimc.o'
                          Makefile:2280: warning: ignoring old recipe for target 'vimc.o'
                          Makefile:2466: warning: overriding recipe for target 'agc.o'
                          Makefile:2402: warning: ignoring old recipe for target 'agc.o'
                          Makefile:2488: warning: overriding recipe for target 'awb.o'
                          Makefile:2406: warning: ignoring old recipe for target 'awb.o'
                          g++ -c -pipe -O2 -Wall -Wextra -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I../libcamera -I. -I../libcamera -I/usr/include/aarch64-linux-gnu/qt5 -I/usr/include/aarch64-linux-gnu/qt5/QtGui -I/usr/include/aarch64-linux-gnu/qt5/QtCore -I. -I/usr/lib/aarch64-linux-gnu/qt5/mkspecs/linux-g++ -o bayer-format.o ../libcamera/test/bayer-format.cpp
                          g++ -c -pipe -O2 -Wall -Wextra -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I../libcamera -I. -I../libcamera -I/usr/include/aarch64-linux-gnu/qt5 -I/usr/include/aarch64-linux-gnu/qt5/QtGui -I/usr/include/aarch64-linux-gnu/qt5/QtCore -I. -I/usr/lib/aarch64-linux-gnu/qt5/mkspecs/linux-g++ -o byte-stream-buffer.o ../libcamera/test/byte-stream-buffer.cpp
                          g++ -c -pipe -O2 -Wall -Wextra -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I../libcamera -I. -I../libcamera -I/usr/include/aarch64-linux-gnu/qt5 -I/usr/include/aarch64-linux-gnu/qt5/QtGui -I/usr/include/aarch64-linux-gnu/qt5/QtCore -I. -I/usr/lib/aarch64-linux-gnu/qt5/mkspecs/linux-g++ -o camera-sensor.o ../libcamera/test/camera-sensor.cpp
                          g++ -c -pipe -O2 -Wall -Wextra -D_REENTRANT -fPIC -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -I../libcamera -I. -I../libcamera -I/usr/include/aarch64-linux-gnu/qt5 -I/usr/include/aarch64-linux-gnu/qt5/QtGui -I/usr/include/aarch64-linux-gnu/qt5/QtCore -I. -I/usr/lib/aarch64-linux-gnu/qt5/mkspecs/linux-g++ -o delayed_controls.o ../libcamera/src/libcamera/delayed_controls.cpp
                          ../libcamera/src/libcamera/delayed_controls.cpp:8:10: fatal error: libcamera/internal/delayed_controls.h: No such file or directory
                          8 | #include "libcamera/internal/delayed_controls.h"
                          | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                          compilation terminated.
                          make: *** [Makefile:1793: delayed_controls.o] Error 1
                          make: *** Waiting for unfinished jobs....
                          ../libcamera/test/bayer-format.cpp:10:10: fatal error: libcamera/transform.h: No such file or directory
                          10 | #include <libcamera/transform.h>
                          | ^~~~~~~~~~~~~~~~~~~~~~~
                          compilation terminated.
                          make: *** [Makefile:1467: bayer-format.o] Error 1
                          ../libcamera/test/camera-sensor.cpp:13:10: fatal error: libcamera/base/utils.h: No such file or directory
                          13 | #include <libcamera/base/utils.h>
                          | ^~~~~~~~~~~~~~~~~~~~~~~~
                          compilation terminated.
                          make: *** [Makefile:1473: camera-sensor.o] Error 1
                          ../libcamera/test/byte-stream-buffer.cpp:11:10: fatal error: libcamera/internal/byte_stream_buffer.h: No such file or directory
                          11 | #include "libcamera/internal/byte_stream_buffer.h"
                          | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                          compilation terminated.
                          make: *** [Makefile:1470: byte-stream-buffer.o] Error 1
                          02:00:32: The process "/usr/bin/make" exited with code 2.
                          Error while building/deploying project libcamera (kit: Desktop)
                          When executing step "Make"
                          02:00:32: Elapsed time: 00:02.

                          2022-07-10-015613_2560x1440_scrot.png

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                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #19

                            The -project options does not do deep dependencies inspection. You need to add the modules your project uses. In your case, the widgets module.

                            As for the rest, check the meson project and pick there the paths you need for the includes, librairies, etc.

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                            1 Reply Last reply
                            1
                            • R Offline
                              R Offline
                              rollyng
                              wrote on last edited by rollyng
                              #20

                              @SGaist said in Any example to use libcamera for Qt5 desktop application?:

                              widgets module

                              Hi SGaist, Thank you and I add the widgets and include path to the libcamera.pro file. I can see the missing header files are now found. But I have the private header error, and I have no idea how to resolve these. Please take a look. Thank you!2022-07-10-123925_2560x1440_scrot.png

                              I believe it only necessary to build the "qcam" example in Qt Creator for my purpose, so I copy "qcam" and did some modification to the qcam.pro file. But it seems unable to resolve the declaration in its own folder? as it failed to find DNGWriter which is declared in the dng_writer.h? 2022-07-10-202425_2560x1440_scrot.png

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                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #21

                                You need to read the meson file to see what additional defines and paths/options they use.

                                Just in case, even if your Qt Creator does not support meson, nothing stops you from using from the command line to build the projet.

                                Interested in AI ? www.idiap.ch
                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                R 1 Reply Last reply
                                0
                                • SGaistS SGaist

                                  You need to read the meson file to see what additional defines and paths/options they use.

                                  Just in case, even if your Qt Creator does not support meson, nothing stops you from using from the command line to build the projet.

                                  R Offline
                                  R Offline
                                  rollyng
                                  wrote on last edited by rollyng
                                  #22

                                  @SGaist May I ask what are these requirements in the meson file? It is strange to me that Qt Creator complains that DNGWriter is not declared despite the dng_writer.h file is already in the same directory as shown above. Besides, how should I modify the qcam.pro as the following meson file? Thank you.

                                  # SPDX-License-Identifier: CC0-1.0

qt5 = import('qt5')
qt5_dep = dependency('qt5',
                     method : 'pkg-config',
                     modules : ['Core', 'Gui', 'Widgets'],
                     required : get_option('qcam'),
                     version : '>=5.4')

if not qt5_dep.found()
    qcam_enabled = false
    subdir_done()
endif

qcam_enabled = true

qcam_sources = files([
    '../cam/image.cpp',
    '../cam/options.cpp',
    '../cam/stream_options.cpp',
    'format_converter.cpp',
    'main.cpp',
    'main_window.cpp',
    'message_handler.cpp',
    'viewfinder_qt.cpp',
])

qcam_moc_headers = files([
    'main_window.h',
    'viewfinder_qt.h',
])

qcam_resources = files([
    'assets/feathericons/feathericons.qrc',
])

qcam_deps = [
    libatomic,
    libcamera_public,
    qt5_dep,
]

qt5_cpp_args = ['-DQT_NO_KEYWORDS']

tiff_dep = dependency('libtiff-4', required : false)
if tiff_dep.found()
    qt5_cpp_args += ['-DHAVE_TIFF']
    qcam_deps += [tiff_dep]
    qcam_sources += files([
        'dng_writer.cpp',
    ])
endif

if cxx.has_header_symbol('QOpenGLWidget', 'QOpenGLWidget',
                         dependencies : qt5_dep, args : '-fPIC')
    qcam_sources += files([
        'viewfinder_gl.cpp',
    ])
    qcam_moc_headers += files([
        'viewfinder_gl.h',
    ])
    qcam_resources += files([
        'assets/shader/shaders.qrc'
    ])
endif

# gcc 9 introduced a deprecated-copy warning that is triggered by Qt until
# Qt 5.13. clang 10 introduced the same warning, but detects more issues
# that are not fixed in Qt yet. Disable the warning manually in both cases.
if ((cc.get_id() == 'gcc' and cc.version().version_compare('>=9.0') and
     qt5_dep.version().version_compare('<5.13')) or
    (cc.get_id() == 'clang' and cc.version().version_compare('>=10.0')))
    qt5_cpp_args += ['-Wno-deprecated-copy']
endif

resources = qt5.preprocess(moc_headers: qcam_moc_headers,
                           qresources : qcam_resources,
                           dependencies: qt5_dep)

qcam  = executable('qcam', qcam_sources, resources,
                   install : true,
                   dependencies : qcam_deps,
                   cpp_args : qt5_cpp_args)
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                                  • R Offline
                                    R Offline
                                    rollyng
                                    wrote on last edited by
                                    #23

                                    @SGaist Hi, I have finally successful to compile qcam as my first Qt GUI code. What I did is removing the dng_writer.h and dng_writer.cpp from the project. Plz have a look, thank you!
                                    2022-07-11-114052_2560x1440_scrot.png

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                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #24

                                      Have a look for why you had to disable the dng_writer part ?

                                      Interested in AI ? www.idiap.ch
                                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                      • SGaistS SGaist

                                        Have a look for why you had to disable the dng_writer part ?

                                        R Offline
                                        R Offline
                                        rollyng
                                        wrote on last edited by rollyng
                                        #25

                                        @SGaist said in Any example to use libcamera for Qt5 desktop application?:

                                        Have a look for why you had to disable the dng_writer part ?

                                        Qt Creator seems unable to pickup dng_writer.h although it is included in the project.

                                        This is due to a special definition in the dng_writer.h and I am including the file here for your quick look.

                                        /* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
 *
 * dng_writer.h - DNG writer
 */

#pragma once

#ifdef HAVE_TIFF /* what is this for? */
#define HAVE_DNG

#undef signals
#undef slots
#undef emit
#undef foreach

#include <libcamera/camera.h>
#include <libcamera/controls.h>
#include <libcamera/framebuffer.h>
#include <libcamera/stream.h>

class DNGWriter
{
public:
    static int write(const char *filename, const libcamera::Camera *camera,
                     const libcamera::StreamConfiguration &config,
                     const libcamera::ControlList &metadata,
                     const libcamera::FrameBuffer *buffer,
                     const void *data);
};

#endif /* HAVE_TIFF, this is going to break the definition for DNGWriter above*/

                                        This is very strange to me whether to include the HAVE_TIFF option or not?
                                        Thanks,
                                        rolly

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                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #26

                                          It's a define that you can add to the DEFINES variable. The meson project defines it if memory serves well.

                                          Interested in AI ? www.idiap.ch
                                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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