b11cd27d14
Implements YASS-inspired automatic exposure control for IDS uEye cameras.
The intervalometer filter analyzes video brightness in real-time and
smoothly ramps camera exposure and gain settings during changing light
conditions - ideal for sunset/sunrise time-lapse photography.
Key features:
- Automatic exposure ramping (0.85-1.24ms configurable range)
- Automatic gain control (0-52 configurable range)
- Real-time brightness analysis (GRAY8, GRAY16, RGB, BGR, BGRA)
- YASS-inspired ramping algorithm (exposure priority, then gain)
- Configurable ramp rates (VSlow/Slow/Medium/Fast/VFast)
- Exposure compensation (±4 stops)
- CSV logging of exposure parameters
- Direct GObject property control (no message bus overhead)
Technical implementation:
- GstBaseTransform filter for in-place processing
- Discovers upstream camera element by name
- Controls camera via g_object_set() for synchronous updates
- Frame-by-frame brightness calculation with format support
Files added:
- gst/intervalometer/gstintervalometer.c: Main implementation (734 lines)
- gst/intervalometer/gstintervalometer.h: Header with structure definitions
- gst/intervalometer/CMakeLists.txt: Build configuration
- gst/intervalometer/README.md: Comprehensive documentation
Files modified:
- gst/CMakeLists.txt: Added intervalometer subdirectory
- build.ps1: Added intervalometer to build and deployment pipeline
Usage example:
gst-launch-1.0 idsueyesrc name=cam ! \\
intervalometer enabled=true camera-element=cam \\
exposure-min=0.85 exposure-max=1.24 \\
gain-min=0 gain-max=52 ramp-rate=medium ! \\
autovideosink
Inspired by YASS (Yet Another Sunset Script) for CHDK cameras by
waterwingz, based on work by Fbonomi and soulf2.
28 lines
601 B
CMake
28 lines
601 B
CMake
set (SOURCES
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gstintervalometer.c
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)
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set (HEADERS
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gstintervalometer.h)
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include_directories (AFTER
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${ORC_INCLUDE_DIR})
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set (libname gstintervalometer)
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add_library (${libname} MODULE
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${SOURCES}
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${HEADERS})
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target_link_libraries (${libname}
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${ORC_LIBRARIES}
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${GLIB2_LIBRARIES}
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${GOBJECT_LIBRARIES}
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${GSTREAMER_LIBRARY}
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${GSTREAMER_BASE_LIBRARY}
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${GSTREAMER_VIDEO_LIBRARY})
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if (WIN32)
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install (FILES $<TARGET_PDB_FILE:${libname}> DESTINATION ${PDB_INSTALL_DIR} COMPONENT pdb OPTIONAL)
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endif ()
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install(TARGETS ${libname} LIBRARY DESTINATION ${PLUGIN_INSTALL_DIR}) |