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.
104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/* GStreamer
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* Copyright (C) 2024 FIXME <fixme@example.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_INTERVALOMETER_H__
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#define __GST_INTERVALOMETER_H__
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#include <stdio.h>
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#include <gst/base/gstbasetransform.h>
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#include <gst/video/video.h>
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G_BEGIN_DECLS
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#define GST_TYPE_INTERVALOMETER \
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(gst_intervalometer_get_type())
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#define GST_INTERVALOMETER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_INTERVALOMETER,GstIntervalometer))
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#define GST_INTERVALOMETER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_INTERVALOMETER,GstIntervalometerClass))
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#define GST_IS_INTERVALOMETER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_INTERVALOMETER))
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#define GST_IS_INTERVALOMETER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_INTERVALOMETER))
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typedef struct _GstIntervalometer GstIntervalometer;
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typedef struct _GstIntervalometerClass GstIntervalometerClass;
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typedef enum {
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RAMP_RATE_VSLOW = 0,
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RAMP_RATE_SLOW,
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RAMP_RATE_MEDIUM,
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RAMP_RATE_FAST,
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RAMP_RATE_VFAST
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} GstIntervalometerRampRate;
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/**
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* GstIntervalometer:
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* @element: the parent element.
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*
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* Auto-exposure controller for IDS uEye cameras.
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* Inspired by YASS (Yet Another Sunset Script) for CHDK cameras.
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*/
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struct _GstIntervalometer
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{
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GstBaseTransform element;
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/* Properties */
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gboolean enabled;
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gdouble target_brightness; /* Target average brightness (0-255) */
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gdouble compensation; /* Exposure compensation in stops */
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gdouble exposure_min; /* Minimum exposure in ms */
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gdouble exposure_max; /* Maximum exposure in ms */
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gint gain_min; /* Minimum gain (0-100) */
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gint gain_max; /* Maximum gain (0-100) */
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GstIntervalometerRampRate ramp_rate;
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gchar *log_file; /* CSV log file path */
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gchar *camera_element_name; /* Name of upstream idsueyesrc element */
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/* Internal state */
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GstElement *camera_src; /* Reference to upstream camera element */
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gdouble current_exposure; /* Current exposure setting */
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gint current_gain; /* Current gain setting */
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gdouble target_exposure; /* Target exposure for ramping */
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gint target_gain; /* Target gain for ramping */
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guint64 frame_count; /* Number of frames processed */
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GstClockTime start_time; /* Time when processing started */
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FILE *log_fp; /* Log file handle */
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gboolean log_header_written; /* Whether CSV header has been written */
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/* Video info */
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GstVideoInfo video_info;
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gboolean video_info_valid;
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/* Ramping parameters */
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gdouble ramp_step; /* Current ramping step size */
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};
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struct _GstIntervalometerClass
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{
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GstBaseTransformClass parent_class;
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};
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GType gst_intervalometer_get_type(void);
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G_END_DECLS
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#endif /* __GST_INTERVALOMETER_H__ */ |