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578 lines
20 KiB
C
578 lines
20 KiB
C
/* GStreamer
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* Copyright (C) <2007> Wim Taymans <wim@fluendo.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., 51 Franklin Street, Suite 500,
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* Boston, MA 02110-1335, USA.
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*/
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/**
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* SECTION:element-simplevideomarkdetect
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* @title: simplevideomarkdetect
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* @see_also: #GstVideoMark
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*
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* This plugin detects #GstSimpleVideoMarkDetect:pattern-count squares in the bottom left
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* corner of the video frames. The squares have a width and height of
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* respectively #GstSimpleVideoMarkDetect:pattern-width and #GstSimpleVideoMarkDetect:pattern-height.
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* Even squares must be black and odd squares must be white.
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*
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* When the pattern has been found, #GstSimpleVideoMarkDetect:pattern-data-count squares
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* after the pattern squares are read as a bitarray. White squares represent a 1
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* bit and black squares a 0 bit. The bitarray will will included in the element
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* message that is posted (see below).
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*
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* After the pattern has been found and the data pattern has been read, an
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* element message called `GstSimpleVideoMarkDetect` will
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* be posted on the bus. If the pattern is no longer found in the frame, the
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* same element message is posted with the have-pattern field set to %FALSE.
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* The message is only posted if the #GstSimpleVideoMarkDetect:message property is %TRUE.
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*
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* The message's structure contains these fields:
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*
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* * #gboolean`have-pattern`: if the pattern was found. This field will be set to %TRUE for as long as
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* the pattern was found in the frame and set to FALSE for the first frame
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* that does not contain the pattern anymore.
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*
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* * #GstClockTime `timestamp`: the timestamp of the buffer that triggered the message.
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*
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* * #GstClockTime `stream-time`: the stream time of the buffer.
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*
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* * #GstClockTime `running-time`: the running_time of the buffer.
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*
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* * #GstClockTime `duration`: the duration of the buffer.
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*
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* * #guint64 `data`: the data-pattern found after the pattern or 0 when have-signal is %FALSE.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 videotestsrc ! simplevideomarkdetect ! videoconvert ! ximagesink
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* ]|
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <gst/video/gstvideofilter.h>
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#include "gstsimplevideomarkdetect.h"
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GST_DEBUG_CATEGORY_STATIC (gst_video_detect_debug_category);
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#define GST_CAT_DEFAULT gst_video_detect_debug_category
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/* prototypes */
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static void gst_video_detect_set_property (GObject * object,
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guint property_id, const GValue * value, GParamSpec * pspec);
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static void gst_video_detect_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec);
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static void gst_video_detect_dispose (GObject * object);
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static void gst_video_detect_finalize (GObject * object);
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static gboolean gst_video_detect_start (GstBaseTransform * trans);
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static gboolean gst_video_detect_stop (GstBaseTransform * trans);
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static gboolean gst_video_detect_set_info (GstVideoFilter * filter,
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GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
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GstVideoInfo * out_info);
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static GstFlowReturn gst_video_detect_transform_frame_ip (GstVideoFilter *
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filter, GstVideoFrame * frame);
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enum
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{
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PROP_0,
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PROP_MESSAGE,
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PROP_PATTERN_WIDTH,
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PROP_PATTERN_HEIGHT,
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PROP_PATTERN_COUNT,
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PROP_PATTERN_DATA_COUNT,
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PROP_PATTERN_CENTER,
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PROP_PATTERN_SENSITIVITY,
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PROP_LEFT_OFFSET,
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PROP_BOTTOM_OFFSET
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};
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#define DEFAULT_MESSAGE TRUE
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#define DEFAULT_PATTERN_WIDTH 4
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#define DEFAULT_PATTERN_HEIGHT 16
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#define DEFAULT_PATTERN_COUNT 4
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#define DEFAULT_PATTERN_DATA_COUNT 5
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#define DEFAULT_PATTERN_CENTER 0.5
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#define DEFAULT_PATTERN_SENSITIVITY 0.3
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#define DEFAULT_LEFT_OFFSET 0
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#define DEFAULT_BOTTOM_OFFSET 0
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/* pad templates */
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#define VIDEO_CAPS \
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GST_VIDEO_CAPS_MAKE( \
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"{ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }")
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/* class initialization */
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G_DEFINE_TYPE_WITH_CODE (GstSimpleVideoMarkDetect, gst_video_detect,
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GST_TYPE_VIDEO_FILTER,
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GST_DEBUG_CATEGORY_INIT (gst_video_detect_debug_category,
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"simplevideomarkdetect", 0,
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"debug category for simplevideomarkdetect element"));
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GST_ELEMENT_REGISTER_DEFINE (simplevideomarkdetect,
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"simplevideomarkdetect", GST_RANK_NONE, GST_TYPE_SIMPLE_VIDEO_MARK_DETECT);
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static void
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gst_video_detect_class_init (GstSimpleVideoMarkDetectClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstBaseTransformClass *base_transform_class =
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GST_BASE_TRANSFORM_CLASS (klass);
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GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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gst_caps_from_string (VIDEO_CAPS)));
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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gst_caps_from_string (VIDEO_CAPS)));
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gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
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"Video detecter", "Filter/Effect/Video",
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"Detect patterns in a video signal", "Wim Taymans <wim@fluendo.com>");
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gobject_class->set_property = gst_video_detect_set_property;
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gobject_class->get_property = gst_video_detect_get_property;
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gobject_class->dispose = gst_video_detect_dispose;
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gobject_class->finalize = gst_video_detect_finalize;
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base_transform_class->start = GST_DEBUG_FUNCPTR (gst_video_detect_start);
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base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_video_detect_stop);
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video_filter_class->set_info = GST_DEBUG_FUNCPTR (gst_video_detect_set_info);
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video_filter_class->transform_frame_ip =
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GST_DEBUG_FUNCPTR (gst_video_detect_transform_frame_ip);
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MESSAGE,
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g_param_spec_boolean ("message", "Message",
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"Post detected data as bus messages",
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DEFAULT_MESSAGE,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PATTERN_WIDTH,
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g_param_spec_int ("pattern-width", "Pattern width",
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"The width of the pattern markers", 1, G_MAXINT,
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DEFAULT_PATTERN_WIDTH,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PATTERN_HEIGHT,
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g_param_spec_int ("pattern-height", "Pattern height",
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"The height of the pattern markers", 1, G_MAXINT,
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DEFAULT_PATTERN_HEIGHT,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PATTERN_COUNT,
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g_param_spec_int ("pattern-count", "Pattern count",
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"The number of pattern markers", 0, G_MAXINT,
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DEFAULT_PATTERN_COUNT,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PATTERN_DATA_COUNT,
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g_param_spec_int ("pattern-data-count", "Pattern data count",
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"The number of extra data pattern markers", 0, G_MAXINT,
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DEFAULT_PATTERN_DATA_COUNT,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PATTERN_CENTER,
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g_param_spec_double ("pattern-center", "Pattern center",
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"The center of the black/white separation (0.0 = lowest, 1.0 highest)",
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0.0, 1.0, DEFAULT_PATTERN_CENTER,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_PATTERN_SENSITIVITY,
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g_param_spec_double ("pattern-sensitivity", "Pattern sensitivity",
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"The sensitivity around the center for detecting the markers "
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"(0.0 = lowest, 1.0 highest)", 0.0, 1.0, DEFAULT_PATTERN_SENSITIVITY,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_LEFT_OFFSET,
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g_param_spec_int ("left-offset", "Left Offset",
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"The offset from the left border where the pattern starts", 0,
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G_MAXINT, DEFAULT_LEFT_OFFSET,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_BOTTOM_OFFSET,
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g_param_spec_int ("bottom-offset", "Bottom Offset",
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"The offset from the bottom border where the pattern starts", 0,
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G_MAXINT, DEFAULT_BOTTOM_OFFSET,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_video_detect_init (GstSimpleVideoMarkDetect * simplevideomarkdetect)
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{
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}
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void
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gst_video_detect_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstSimpleVideoMarkDetect *simplevideomarkdetect =
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GST_SIMPLE_VIDEO_MARK_DETECT (object);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "set_property");
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switch (property_id) {
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case PROP_MESSAGE:
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simplevideomarkdetect->message = g_value_get_boolean (value);
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break;
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case PROP_PATTERN_WIDTH:
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simplevideomarkdetect->pattern_width = g_value_get_int (value);
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break;
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case PROP_PATTERN_HEIGHT:
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simplevideomarkdetect->pattern_height = g_value_get_int (value);
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break;
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case PROP_PATTERN_COUNT:
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simplevideomarkdetect->pattern_count = g_value_get_int (value);
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break;
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case PROP_PATTERN_DATA_COUNT:
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simplevideomarkdetect->pattern_data_count = g_value_get_int (value);
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break;
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case PROP_PATTERN_CENTER:
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simplevideomarkdetect->pattern_center = g_value_get_double (value);
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break;
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case PROP_PATTERN_SENSITIVITY:
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simplevideomarkdetect->pattern_sensitivity = g_value_get_double (value);
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break;
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case PROP_LEFT_OFFSET:
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simplevideomarkdetect->left_offset = g_value_get_int (value);
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break;
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case PROP_BOTTOM_OFFSET:
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simplevideomarkdetect->bottom_offset = g_value_get_int (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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void
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gst_video_detect_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstSimpleVideoMarkDetect *simplevideomarkdetect =
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GST_SIMPLE_VIDEO_MARK_DETECT (object);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "get_property");
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switch (property_id) {
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case PROP_MESSAGE:
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g_value_set_boolean (value, simplevideomarkdetect->message);
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break;
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case PROP_PATTERN_WIDTH:
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g_value_set_int (value, simplevideomarkdetect->pattern_width);
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break;
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case PROP_PATTERN_HEIGHT:
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g_value_set_int (value, simplevideomarkdetect->pattern_height);
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break;
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case PROP_PATTERN_COUNT:
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g_value_set_int (value, simplevideomarkdetect->pattern_count);
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break;
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case PROP_PATTERN_DATA_COUNT:
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g_value_set_int (value, simplevideomarkdetect->pattern_data_count);
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break;
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case PROP_PATTERN_CENTER:
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g_value_set_double (value, simplevideomarkdetect->pattern_center);
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break;
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case PROP_PATTERN_SENSITIVITY:
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g_value_set_double (value, simplevideomarkdetect->pattern_sensitivity);
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break;
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case PROP_LEFT_OFFSET:
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g_value_set_int (value, simplevideomarkdetect->left_offset);
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break;
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case PROP_BOTTOM_OFFSET:
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g_value_set_int (value, simplevideomarkdetect->bottom_offset);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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void
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gst_video_detect_dispose (GObject * object)
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{
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GstSimpleVideoMarkDetect *simplevideomarkdetect =
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GST_SIMPLE_VIDEO_MARK_DETECT (object);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "dispose");
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/* clean up as possible. may be called multiple times */
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G_OBJECT_CLASS (gst_video_detect_parent_class)->dispose (object);
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}
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void
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gst_video_detect_finalize (GObject * object)
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{
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GstSimpleVideoMarkDetect *simplevideomarkdetect =
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GST_SIMPLE_VIDEO_MARK_DETECT (object);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "finalize");
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/* clean up object here */
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G_OBJECT_CLASS (gst_video_detect_parent_class)->finalize (object);
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}
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static gboolean
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gst_video_detect_start (GstBaseTransform * trans)
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{
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GstSimpleVideoMarkDetect *simplevideomarkdetect =
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GST_SIMPLE_VIDEO_MARK_DETECT (trans);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "start");
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return TRUE;
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}
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static gboolean
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gst_video_detect_stop (GstBaseTransform * trans)
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{
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GstSimpleVideoMarkDetect *simplevideomarkdetect =
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GST_SIMPLE_VIDEO_MARK_DETECT (trans);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "stop");
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return TRUE;
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}
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static gboolean
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gst_video_detect_set_info (GstVideoFilter * filter, GstCaps * incaps,
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GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
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{
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GstSimpleVideoMarkDetect *simplevideomarkdetect =
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GST_SIMPLE_VIDEO_MARK_DETECT (filter);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "set_info");
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return TRUE;
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}
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static void
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gst_video_detect_post_message (GstSimpleVideoMarkDetect * simplevideomarkdetect,
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GstBuffer * buffer, guint64 data)
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{
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GstBaseTransform *trans;
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GstMessage *m;
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guint64 duration, timestamp, running_time, stream_time;
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trans = GST_BASE_TRANSFORM_CAST (simplevideomarkdetect);
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/* get timestamps */
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timestamp = GST_BUFFER_TIMESTAMP (buffer);
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duration = GST_BUFFER_DURATION (buffer);
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running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
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timestamp);
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stream_time = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
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timestamp);
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/* post message */
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m = gst_message_new_element (GST_OBJECT_CAST (simplevideomarkdetect),
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gst_structure_new ("GstSimpleVideoMarkDetect",
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"have-pattern", G_TYPE_BOOLEAN, simplevideomarkdetect->in_pattern,
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"timestamp", G_TYPE_UINT64, timestamp,
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"stream-time", G_TYPE_UINT64, stream_time,
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"running-time", G_TYPE_UINT64, running_time,
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"duration", G_TYPE_UINT64, duration,
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"data", G_TYPE_UINT64, data, NULL));
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gst_element_post_message (GST_ELEMENT_CAST (simplevideomarkdetect), m);
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}
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static gdouble
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gst_video_detect_calc_brightness (GstSimpleVideoMarkDetect *
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simplevideomarkdetect, guint8 * data, gint width, gint height,
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gint row_stride, gint pixel_stride)
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{
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gint i, j;
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guint64 sum;
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sum = 0;
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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sum += data[pixel_stride * j];
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}
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data += row_stride;
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}
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return sum / (255.0 * width * height);
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}
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static gint
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calculate_pw (gint pw, gint x, gint width)
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{
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if (x < 0)
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pw += x;
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else if ((x + pw) > width)
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pw = width - x;
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return pw;
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}
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static void
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gst_video_detect_yuv (GstSimpleVideoMarkDetect * simplevideomarkdetect,
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GstVideoFrame * frame)
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{
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gdouble brightness;
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gint i, pw, ph, row_stride, pixel_stride;
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gint width, height, offset_calc, x, y;
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guint8 *d;
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guint64 pattern_data;
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gint total_pattern;
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width = frame->info.width;
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height = frame->info.height;
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pw = simplevideomarkdetect->pattern_width;
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ph = simplevideomarkdetect->pattern_height;
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row_stride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
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pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 0);
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d = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
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/* move to start of bottom left, adjust for offsets */
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offset_calc =
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row_stride * (height - ph - simplevideomarkdetect->bottom_offset) +
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pixel_stride * simplevideomarkdetect->left_offset;
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x = simplevideomarkdetect->left_offset;
|
|
y = height - ph - simplevideomarkdetect->bottom_offset;
|
|
|
|
total_pattern =
|
|
simplevideomarkdetect->pattern_count +
|
|
simplevideomarkdetect->pattern_data_count;
|
|
/* If x and y offset values are outside the video, no need to analyze */
|
|
if ((x + (pw * total_pattern)) < 0 || x > width || (y + height) < 0
|
|
|| y > height) {
|
|
GST_ERROR_OBJECT (simplevideomarkdetect,
|
|
"simplevideomarkdetect pattern is outside the video. Not Analyzing.");
|
|
return;
|
|
}
|
|
|
|
/* Offset calculation less than 0, then reset to 0 */
|
|
if (offset_calc < 0)
|
|
offset_calc = 0;
|
|
/* Y position of mark is negative or pattern exceeds the video height,
|
|
then recalculate pattern height for partial display */
|
|
if (y < 0)
|
|
ph += y;
|
|
else if ((y + ph) > height)
|
|
ph = height - y;
|
|
/* If pattern height is less than 0, need not analyze anything */
|
|
if (ph < 0)
|
|
return;
|
|
|
|
/* move to start of bottom left */
|
|
d += offset_calc;
|
|
|
|
/* analyze the bottom left pixels */
|
|
for (i = 0; i < simplevideomarkdetect->pattern_count; i++) {
|
|
gint draw_pw;
|
|
/* calc brightness of width * height box */
|
|
brightness =
|
|
gst_video_detect_calc_brightness (simplevideomarkdetect, d, pw, ph,
|
|
row_stride, pixel_stride);
|
|
|
|
GST_DEBUG_OBJECT (simplevideomarkdetect, "brightness %f", brightness);
|
|
|
|
if (i & 1) {
|
|
/* odd pixels must be white, all pixels darker than the center +
|
|
* sensitivity are considered wrong. */
|
|
if (brightness <
|
|
(simplevideomarkdetect->pattern_center +
|
|
simplevideomarkdetect->pattern_sensitivity))
|
|
goto no_pattern;
|
|
} else {
|
|
/* even pixels must be black, pixels lighter than the center - sensitivity
|
|
* are considered wrong. */
|
|
if (brightness >
|
|
(simplevideomarkdetect->pattern_center -
|
|
simplevideomarkdetect->pattern_sensitivity))
|
|
goto no_pattern;
|
|
}
|
|
|
|
/* X position of mark is negative or pattern exceeds the video width,
|
|
then recalculate pattern width for partial display */
|
|
draw_pw = calculate_pw (pw, x, width);
|
|
/* If pattern width is less than 0, continue with the next pattern */
|
|
if (draw_pw < 0)
|
|
continue;
|
|
|
|
/* move to i-th pattern */
|
|
d += pixel_stride * draw_pw;
|
|
x += draw_pw;
|
|
|
|
if ((x + (pw * (total_pattern - i - 1))) < 0 || x >= width)
|
|
break;
|
|
}
|
|
GST_DEBUG_OBJECT (simplevideomarkdetect, "found pattern");
|
|
|
|
pattern_data = 0;
|
|
|
|
/* get the data of the pattern */
|
|
for (i = 0; i < simplevideomarkdetect->pattern_data_count; i++) {
|
|
gint draw_pw;
|
|
/* calc brightness of width * height box */
|
|
brightness =
|
|
gst_video_detect_calc_brightness (simplevideomarkdetect, d, pw, ph,
|
|
row_stride, pixel_stride);
|
|
/* update pattern, we just use the center to decide between black and white. */
|
|
pattern_data <<= 1;
|
|
if (brightness > simplevideomarkdetect->pattern_center)
|
|
pattern_data |= 1;
|
|
|
|
/* X position of mark is negative or pattern exceeds the video width,
|
|
then recalculate pattern width for partial display */
|
|
draw_pw = calculate_pw (pw, x, width);
|
|
/* If pattern width is less than 0, continue with the next pattern */
|
|
if (draw_pw < 0)
|
|
continue;
|
|
|
|
/* move to i-th pattern data */
|
|
d += pixel_stride * draw_pw;
|
|
x += draw_pw;
|
|
|
|
if ((x + (pw * (simplevideomarkdetect->pattern_data_count - i - 1))) < 0
|
|
|| x >= width)
|
|
break;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (simplevideomarkdetect, "have data %" G_GUINT64_FORMAT,
|
|
pattern_data);
|
|
|
|
simplevideomarkdetect->in_pattern = TRUE;
|
|
gst_video_detect_post_message (simplevideomarkdetect, frame->buffer,
|
|
pattern_data);
|
|
|
|
return;
|
|
|
|
no_pattern:
|
|
{
|
|
GST_DEBUG_OBJECT (simplevideomarkdetect, "no pattern found");
|
|
if (simplevideomarkdetect->in_pattern) {
|
|
simplevideomarkdetect->in_pattern = FALSE;
|
|
gst_video_detect_post_message (simplevideomarkdetect, frame->buffer, 0);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_video_detect_transform_frame_ip (GstVideoFilter * filter,
|
|
GstVideoFrame * frame)
|
|
{
|
|
GstSimpleVideoMarkDetect *simplevideomarkdetect =
|
|
GST_SIMPLE_VIDEO_MARK_DETECT (filter);
|
|
|
|
GST_DEBUG_OBJECT (simplevideomarkdetect, "transform_frame_ip");
|
|
|
|
gst_video_detect_yuv (simplevideomarkdetect, frame);
|
|
|
|
return GST_FLOW_OK;
|
|
}
|