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yushulxyushulx
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Add barcode scaner example
1 parent 7920d41 commit 813f456

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‎examples/barcode-scanner/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.15)
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# Project name and version
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project(CameraProject VERSION 1.0 LANGUAGES CXX)
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# Set C++ standard
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED True)
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# Define include directories
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set(INCLUDE_DIR ${CMAKE_SOURCE_DIR}/include)
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# Define source files for the Camera library
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if (WIN32)
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if (CMAKE_BUILD_TYPE STREQUAL "Debug")
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set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreadedDebug")
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else()
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set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded")
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endif()
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set(LIBRARY_SOURCES
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src/CameraWindows.cpp
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src/CameraPreviewWindows.cpp
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)
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elseif (UNIX AND NOT APPLE)
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set(LIBRARY_SOURCES
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src/CameraLinux.cpp
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src/CameraPreviewLinux.cpp
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)
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elseif (APPLE)
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set(CMAKE_OSX_ARCHITECTURES "x86_64;arm64")
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# Ensure that Objective-C++ source files are compiled as Objective-C++
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set(LIBRARY_SOURCES
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src/CameraMacOS.mm
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src/CameraPreviewMacOS.mm
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)
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set_source_files_properties(src/CameraMacOS.mm src/CameraPreviewMacOS.mm PROPERTIES COMPILE_FLAGS "-x objective-c++")
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# Set main.cpp to be treated as Objective-C++
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set_source_files_properties(src/main.cpp PROPERTIES COMPILE_FLAGS "-x objective-c++")
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endif()
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# Add JNI wrapper source (common for all platforms)
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list(APPEND LIBRARY_SOURCES
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src/LiteCamJNI.cpp
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)
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# Define source files for the executable
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set(EXECUTABLE_SOURCES
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src/main.cpp
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)
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# Add the Camera shared library
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add_library(litecam SHARED ${LIBRARY_SOURCES})
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# Set include directories for the Camera library
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target_include_directories(litecam PUBLIC ${INCLUDE_DIR})
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# Define the CAMERA_EXPORTS macro for the shared library
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target_compile_definitions(litecam PRIVATE CAMERA_EXPORTS)
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# Platform-specific dependencies for the Camera library
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if (UNIX AND NOT APPLE)
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find_package(X11 REQUIRED)
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if (X11_FOUND)
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target_include_directories(litecam PUBLIC ${X11_INCLUDE_DIR})
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target_link_libraries(litecam PRIVATE ${X11_LIBRARIES} pthread)
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endif()
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elseif (APPLE)
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find_library(COCOA_LIBRARY Cocoa REQUIRED)
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find_library(AVFOUNDATION_LIBRARY AVFoundation REQUIRED)
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find_library(COREMEDIA_LIBRARY CoreMedia REQUIRED)
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find_library(COREVIDEO_LIBRARY CoreVideo REQUIRED)
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find_library(OBJC_LIBRARY objc REQUIRED) # Add the Objective-C runtime library
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target_link_libraries(litecam PRIVATE
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${COCOA_LIBRARY}
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${AVFOUNDATION_LIBRARY}
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${COREMEDIA_LIBRARY}
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${COREVIDEO_LIBRARY}
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${OBJC_LIBRARY} # Link the Objective-C runtime
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)
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elseif (WIN32)
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target_link_libraries(litecam PRIVATE ole32 uuid mfplat mf mfreadwrite mfuuid)
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endif()
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# JNI support
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find_package(JNI)
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if (JNI_FOUND)
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message(STATUS "JNI found: ${JNI_INCLUDE_DIRS}")
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target_include_directories(litecam PRIVATE ${JNI_INCLUDE_DIRS})
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target_compile_definitions(litecam PRIVATE LITECAM_JNI_ENABLED)
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else()
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message(WARNING "JNI not found; Java wrapper native methods won't be available.")
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endif()
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# Add the camera_capture executable
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add_executable(camera_capture ${EXECUTABLE_SOURCES})
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# Link the Camera library to the executable
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target_link_libraries(camera_capture PRIVATE litecam)
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# Include the shared library's headers in the executable
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target_include_directories(camera_capture PRIVATE ${INCLUDE_DIR})
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# For macOS, link against the Cocoa framework
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if (APPLE)
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target_link_libraries(camera_capture PRIVATE
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${COCOA_LIBRARY}
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${AVFOUNDATION_LIBRARY}
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${COREMEDIA_LIBRARY}
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${COREVIDEO_LIBRARY}
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${OBJC_LIBRARY} # Link the Objective-C runtime
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)
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endif()

‎examples/barcode-scanner/build-jar.ps1‎

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# PowerShell script to compile Java sources and create litecam.jar
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param(
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[string]$BuildDir = "build",
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# Optional: additional directories containing prebuilt natives to merge (each should contain platform libs)
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[string[]]$ExtraNativeDirs = @()
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)
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$ErrorActionPreference = 'Stop'
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$projectRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
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Set-Location $projectRoot
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$javaSrc = Join-Path $projectRoot 'java-src'
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$outDir = Join-Path $projectRoot 'java-build'
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if (Test-Path $outDir) { Remove-Item -Recurse -Force $outDir }
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New-Item -ItemType Directory -Force -Path $outDir | Out-Null
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Write-Host "Compiling Java sources..."
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$javaFiles = Get-ChildItem -Recurse $javaSrc -Filter *.java | ForEach-Object { $_.FullName }
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& javac -d $outDir $javaFiles
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if ($LASTEXITCODE -ne 0) { throw "javac failed" }
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$jarPath = Join-Path $projectRoot 'litecam.jar'
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if (Test-Path $jarPath) { Remove-Item $jarPath }
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# Collect native libraries by platform/arch
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$nativeMap = @{}
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$dllCandidates = @()
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$dllCandidates += (Join-Path $projectRoot 'build/Release/litecam.dll')
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$dllCandidates += (Join-Path $projectRoot 'build/litecam.dll')
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$dllCandidates += (Join-Path $projectRoot 'build/Release/liblitecam.dylib')
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$dllCandidates += (Join-Path $projectRoot 'build/liblitecam.dylib')
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$dllCandidates += (Join-Path $projectRoot 'build/Release/liblitecam.so')
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$dllCandidates += (Join-Path $projectRoot 'build/liblitecam.so')
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function Get-OsToken {
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if ([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform([System.Runtime.InteropServices.OSPlatform]::Windows)) { return 'windows' }
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elseif ([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform([System.Runtime.InteropServices.OSPlatform]::OSX)) { return 'macos' }
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else { return 'linux' }
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}
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function Get-ArchToken { if ([System.Runtime.InteropServices.RuntimeInformation]::OSArchitecture -in @('Arm64')) { 'arm64' } else { 'x86_64' } }
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$osToken = Get-OsToken
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$archToken = Get-ArchToken
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# Primary host build native bundling
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$nativeRoot = Join-Path $outDir 'natives'
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New-Item -ItemType Directory -Force -Path $nativeRoot | Out-Null
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$nativeDir = Join-Path $nativeRoot "$osToken-$archToken"
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New-Item -ItemType Directory -Force -Path $nativeDir | Out-Null
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$picked = $false
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foreach ($c in $dllCandidates) {
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if (Test-Path $c) {
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$destName = if ($osToken -eq 'windows') { 'litecam.dll' } elseif ($osToken -eq 'macos') { 'liblitecam.dylib' } else { 'liblitecam.so' }
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Copy-Item $c (Join-Path $nativeDir $destName) -Force
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Write-Host "Bundling native library: $c -> natives/$osToken-$archToken/$destName"
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$picked = $true
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break
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}
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}
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if (-not $picked) { Write-Warning "No native library found to bundle for host." }
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# Merge additional prebuilt native sets
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foreach ($dir in $ExtraNativeDirs) {
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if (-not (Test-Path $dir)) { Write-Warning "Extra native dir not found: $dir"; continue }
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# Expect structure like <dir>/windows-x86_64/litecam.dll etc. Copy recursively.
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Get-ChildItem -Directory $dir | ForEach-Object {
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$platformFolder = $_.Name
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$target = Join-Path $nativeRoot $platformFolder
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New-Item -ItemType Directory -Force -Path $target | Out-Null
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Get-ChildItem -File -Recurse $_.FullName | ForEach-Object {
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Copy-Item $_.FullName (Join-Path $target ($_.Name)) -Force
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}
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Write-Host "Merged extra natives: $platformFolder"
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}
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}
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Write-Host "Creating JAR with bundled natives..."
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Push-Location $outDir
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& jar cf $jarPath .
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Pop-Location
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Write-Host "Created $jarPath (includes natives/* for packaged platforms)"
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# Convenience run script
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$runScript = @'
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@echo off
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setlocal
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set JAR=%~dp0litecam.jar
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java -cp "%JAR%" com.example.litecam.LiteCamViewer %*
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endlocal
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'@
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Set-Content -Path (Join-Path $projectRoot 'run-litecam.bat') -Value $runScript -Encoding ASCII
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Write-Host "Created run-litecam.bat"

‎examples/barcode-scanner/build-jar.sh‎

Whitespace-only changes.

‎examples/barcode-scanner/include/Camera.h‎

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#ifndef CAMERA_H
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#define CAMERA_H
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#include <vector>
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#include <string>
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#include <iostream>
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#include <cstdint>
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// Export macro for shared library
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#ifdef _WIN32
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#ifdef CAMERA_EXPORTS
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#define CAMERA_API __declspec(dllexport)
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#else
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#define CAMERA_API __declspec(dllimport)
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#endif
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#elif defined(__linux__) || defined(__APPLE__)
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#define CAMERA_API __attribute__((visibility("default")))
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#else
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#define CAMERA_API
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#endif
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// Platform-specific includes
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#ifdef _WIN32
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#include <windows.h>
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#include <mfapi.h>
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#include <mfidl.h>
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#include <mfobjects.h>
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#include <mfreadwrite.h>
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#include <wrl/client.h>
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#include <dshow.h>
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#elif __linux__
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#include <linux/videodev2.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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struct Buffer
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{
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void *start;
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size_t length;
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};
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#endif
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// Struct definitions
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struct CAMERA_API FrameData
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{
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unsigned char *rgbData; // RGB pixel data
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int width; // Frame width
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int height; // Frame height
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size_t size;
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};
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struct CAMERA_API MediaTypeInfo
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{
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uint32_t width;
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uint32_t height;
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#ifdef _WIN32
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wchar_t subtypeName[512]; // Wide characters for Windows
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#else
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char subtypeName[512]; // Narrow characters for Linux/macOS
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#endif
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};
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struct CAMERA_API CaptureDeviceInfo
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{
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#ifdef _WIN32
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wchar_t friendlyName[512];
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#else
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char friendlyName[512]; // Narrow characters for Linux/macOS
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#endif
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};
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// Exported functions
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CAMERA_API std::vector<CaptureDeviceInfo> ListCaptureDevices();
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CAMERA_API void ReleaseFrame(FrameData &frame);
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CAMERA_API void saveFrameAsJPEG(const unsigned char *data, int width, int height, const std::string &filename);
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// Camera class
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class CAMERA_API Camera
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{
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public:
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#ifdef _WIN32
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Camera();
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~Camera();
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#elif __linux__
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Camera() : frameWidth(640), frameHeight(480), fd(-1), buffers(nullptr), bufferCount(0) {}
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~Camera() { Release(); }
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#elif __APPLE__
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Camera() noexcept; // Add noexcept to match the implementation
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~Camera();
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#endif
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bool Open(int cameraIndex);
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void Release();
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std::vector<MediaTypeInfo> ListSupportedMediaTypes();
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FrameData CaptureFrame();
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bool SetResolution(int width, int height);
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uint32_t frameWidth;
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uint32_t frameHeight;
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private:
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#ifdef _WIN32
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void *reader;
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bool initialized;
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void InitializeMediaFoundation();
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void ShutdownMediaFoundation();
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#endif
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#ifdef __linux__
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int fd;
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Buffer *buffers;
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unsigned int bufferCount;
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bool InitDevice();
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void UninitDevice();
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bool StartCapture();
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void StopCapture();
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#endif
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#ifdef __APPLE__
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void *captureSession; // AVFoundation session object
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void *videoOutput;
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#endif
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};
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#endif // CAMERA_H

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