Camera usb

[DQUY05]

Hi !

I try to find out and connect the external camera via usb hub on android, but the device is not detected, while I use some apps on Google play, it still opens this external camera, this topic has a lot of questions. Many people ask, but so far there is no solution, I hope everyone can help me

    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
    foreach (const QCameraInfo &cameraInfo, cameras)
    {
        ui->textEdit->setText(ui->textEdit->toPlainText()+","+cameraInfo.deviceName()+":"+cameraInfo.orientation()+"\n");
    }

Thanks!

[DQUY05]

Hi,

During my research, I found that there is a Libuvc library (https://github.com/libuvc/libuvc) that solves the problem, but the build process is quite complicated, because I use MinGw-64bit, there is a possibility of incompatibility (in the example, MSVC2019), there is who has worked on this topic please help me

Many thanks!

[Pablo J. Rogina]

@DQUY05 said in Camera usb:

but the build process is quite complicated, because I use MinGw-64bit

Mmm, it looks like your mixing things here.
If you look to build this library libuvc for Android, you'll need to use Android NDK

[DQUY05]

@Pablo-J-Rogina said in Camera usb:

Mmm, it looks like your mixing things here.
If you look to build this library libuvc for Android, you'll need to use Android NDK

Thanks for your support
yes, I am confused with MinGw, I have android NDK as shown below,


But with libuvc, when building with cmake, there is part of MSVC2019 request, like in cmakeError file, while my MSVC is getting some impossible errors fix, also i want to ask, is there any other way to reach 1 camera outside the phone? i need to use it with openCV, is IP camera possible?

Build started 16/10/2021 10:48:10 AM.
Project "C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj" on node 1 (default targets).
PrepareForBuild:
  Creating directory "Debug\".
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.CppBuild.targets(449,5): warning MSB8003: The WindowsSDKDir property is not defined. Some build tools may not be found. [C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj]
  Creating directory "Debug\CompilerIdC.tlog\".
InitializeBuildStatus:
  Creating "Debug\CompilerIdC.tlog\unsuccessfulbuild" because "AlwaysCreate" was specified.
ClCompile:
  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX64\x64\CL.exe /c /nologo /W0 /WX- /diagnostics:column /Od /D _MBCS /Gm- /EHsc /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"Debug\\" /Fd"Debug\vc142.pdb" /Gd /TC /FC /errorReport:queue CMakeCCompilerId.c
  CMakeCCompilerId.c
Link:
  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX64\x64\link.exe /ERRORREPORT:QUEUE /OUT:".\CompilerIdC.exe" /INCREMENTAL:NO /NOLOGO kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /MANIFEST /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /manifest:embed /PDB:".\CompilerIdC.pdb" /SUBSYSTEM:CONSOLE /TLBID:1 /DYNAMICBASE /NXCOMPAT /IMPLIB:".\CompilerIdC.lib" /MACHINE:X64 Debug\CMakeCCompilerId.obj
LINK : fatal error LNK1181: cannot open input file 'kernel32.lib' [C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj]
Done Building Project "C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj" (default targets) -- FAILED.

Build FAILED.

"C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj" (default target) (1) ->
(PrepareForBuild target) -> 
  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.CppBuild.targets(449,5): warning MSB8003: The WindowsSDKDir property is not defined. Some build tools may not be found. [C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj]


"C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj" (default target) (1) ->
(Link target) -> 
  LINK : fatal error LNK1181: cannot open input file 'kernel32.lib' [C:\libuvc\libuvc\build\CMakeFiles\3.17.2\CompilerIdC\CompilerIdC.vcxproj]

    1 Warning(s)
    1 Error(s)

Many thanks !

[Pablo J. Rogina]

@DQUY05 said in Camera usb:

there is part of MSVC2019 request

I'm not familiar with building Android libraries under Windows OS, sorry.
However, it looks like you're not building for Android anyway, see from the build output you posted:

 /MACHINE:X64

is there any other way to reach 1 camera outside the phone?

You may want to look at this project UVCCamera

i need to use it with openCV

You may want to look at this project OpenCVwithUVC

[DQUY05]

@Pablo-J-Rogina said in Camera usb:

@DQUY05 said in Camera usb:

there is part of MSVC2019 request

I'm not familiar with building Android libraries under Windows OS, sorry.
However, it looks like you're not building for Android anyway, see from the build output you posted:

 /MACHINE:X64

is there any other way to reach 1 camera outside the phone?

You may want to look at this project UVCCamera

i need to use it with openCV

You may want to look at this project OpenCVwithUVC

hi
Thank you for your support
About android app, I still use it normally
About OpenCVwithUVC, I will try it and let you know when I have the results
Many thanks!

[DQUY05]

@Pablo-J-Rogina said in Camera usb:

@DQUY05 said in Camera usb:

there is part of MSVC2019 request

I'm not familiar with building Android libraries under Windows OS, sorry.
However, it looks like you're not building for Android anyway, see from the build output you posted:

 /MACHINE:X64

is there any other way to reach 1 camera outside the phone?

You may want to look at this project UVCCamera

i need to use it with openCV

You may want to look at this project OpenCVwithUVC

hi,
Sorry, because this project path is android studio java, I don't have knowledge in this field, still looking forward to Qt example

Many thanks!