gstreamer/gst/videosignal/gstsimplevideomarkdetect.c

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/* GStreamer
* Copyright (C) <2007> Wim Taymans <wim@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-simplevideomarkdetect
* @see_also: #GstVideoMark
*
* This plugin detects #GstSimpleVideoMarkDetect:pattern-count squares in the bottom left
* corner of the video frames. The squares have a width and height of
* respectively #GstSimpleVideoMarkDetect:pattern-width and #GstSimpleVideoMarkDetect:pattern-height.
* Even squares must be black and odd squares must be white.
*
* When the pattern has been found, #GstSimpleVideoMarkDetect:pattern-data-count squares
* after the pattern squares are read as a bitarray. White squares represent a 1
* bit and black squares a 0 bit. The bitarray will will included in the element
* message that is posted (see below).
*
* After the pattern has been found and the data pattern has been read, an
* element message called <classname>&quot;GstSimpleVideoMarkDetect&quot;</classname> will
* be posted on the bus. If the pattern is no longer found in the frame, the
* same element message is posted with the have-pattern field set to #FALSE.
* The message is only posted if the #GstSimpleVideoMarkDetect:message property is #TRUE.
*
* The message's structure contains these fields:
* <itemizedlist>
* <listitem>
* <para>
* #gboolean
* <classname>&quot;have-pattern&quot;</classname>:
* if the pattern was found. This field will be set to #TRUE for as long as
* the pattern was found in the frame and set to FALSE for the first frame
* that does not contain the pattern anymore.
* </para>
* </listitem>
* <listitem>
* <para>
* #GstClockTime
* <classname>&quot;timestamp&quot;</classname>:
* the timestamp of the buffer that triggered the message.
* </para>
* </listitem>
* <listitem>
* <para>
* #GstClockTime
* <classname>&quot;stream-time&quot;</classname>:
* the stream time of the buffer.
* </para>
* </listitem>
* <listitem>
* <para>
* #GstClockTime
* <classname>&quot;running-time&quot;</classname>:
* the running_time of the buffer.
* </para>
* </listitem>
* <listitem>
* <para>
* #GstClockTime
* <classname>&quot;duration&quot;</classname>:
* the duration of the buffer.
* </para>
* </listitem>
* <listitem>
* <para>
* #guint64
* <classname>&quot;data&quot;</classname>:
* the data-pattern found after the pattern or 0 when have-signal is #FALSE.
* </para>
* </listitem>
* </itemizedlist>
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch videotestsrc ! simplevideomarkdetect ! videoconvert ! ximagesink
* ]|
* </refsect2>
*
* Last reviewed on 2007-05-30 (0.10.5)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideofilter.h>
#include "gstsimplevideomarkdetect.h"
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GST_DEBUG_CATEGORY_STATIC (gst_video_detect_debug_category);
#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,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_video_detect_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_video_detect_dispose (GObject * object);
static void gst_video_detect_finalize (GObject * object);
static gboolean gst_video_detect_start (GstBaseTransform * trans);
static gboolean gst_video_detect_stop (GstBaseTransform * trans);
static gboolean gst_video_detect_set_info (GstVideoFilter * filter,
GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
GstVideoInfo * out_info);
static GstFlowReturn gst_video_detect_transform_frame_ip (GstVideoFilter *
filter, GstVideoFrame * frame);
enum
{
PROP_0,
PROP_MESSAGE,
PROP_PATTERN_WIDTH,
PROP_PATTERN_HEIGHT,
PROP_PATTERN_COUNT,
PROP_PATTERN_DATA_COUNT,
PROP_PATTERN_CENTER,
PROP_PATTERN_SENSITIVITY,
PROP_LEFT_OFFSET,
PROP_BOTTOM_OFFSET
};
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#define DEFAULT_MESSAGE TRUE
#define DEFAULT_PATTERN_WIDTH 4
#define DEFAULT_PATTERN_HEIGHT 16
#define DEFAULT_PATTERN_COUNT 4
#define DEFAULT_PATTERN_DATA_COUNT 5
#define DEFAULT_PATTERN_CENTER 0.5
#define DEFAULT_PATTERN_SENSITIVITY 0.3
#define DEFAULT_LEFT_OFFSET 0
#define DEFAULT_BOTTOM_OFFSET 0
/* pad templates */
#define VIDEO_CAPS \
GST_VIDEO_CAPS_MAKE( \
"{ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }")
/* class initialization */
G_DEFINE_TYPE_WITH_CODE (GstSimpleVideoMarkDetect, gst_video_detect,
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GST_TYPE_VIDEO_FILTER,
GST_DEBUG_CATEGORY_INIT (gst_video_detect_debug_category,
"simplevideomarkdetect", 0,
"debug category for simplevideomarkdetect element"));
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static void
gst_video_detect_class_init (GstSimpleVideoMarkDetectClass * klass)
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{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *base_transform_class =
GST_BASE_TRANSFORM_CLASS (klass);
GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);
gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_caps_from_string (VIDEO_CAPS)));
gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
gst_caps_from_string (VIDEO_CAPS)));
gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
"Video detecter", "Filter/Effect/Video",
"Detect patterns in a video signal", "Wim Taymans <wim@fluendo.com>");
gobject_class->set_property = gst_video_detect_set_property;
gobject_class->get_property = gst_video_detect_get_property;
gobject_class->dispose = gst_video_detect_dispose;
gobject_class->finalize = gst_video_detect_finalize;
base_transform_class->start = GST_DEBUG_FUNCPTR (gst_video_detect_start);
base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_video_detect_stop);
video_filter_class->set_info = GST_DEBUG_FUNCPTR (gst_video_detect_set_info);
video_filter_class->transform_frame_ip =
GST_DEBUG_FUNCPTR (gst_video_detect_transform_frame_ip);
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MESSAGE,
g_param_spec_boolean ("message", "Message",
"Post detected data as bus messages",
DEFAULT_MESSAGE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PATTERN_WIDTH,
g_param_spec_int ("pattern-width", "Pattern width",
"The width of the pattern markers", 1, G_MAXINT,
DEFAULT_PATTERN_WIDTH,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PATTERN_HEIGHT,
g_param_spec_int ("pattern-height", "Pattern height",
"The height of the pattern markers", 1, G_MAXINT,
DEFAULT_PATTERN_HEIGHT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PATTERN_COUNT,
g_param_spec_int ("pattern-count", "Pattern count",
"The number of pattern markers", 0, G_MAXINT,
DEFAULT_PATTERN_COUNT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PATTERN_DATA_COUNT,
g_param_spec_int ("pattern-data-count", "Pattern data count",
"The number of extra data pattern markers", 0, G_MAXINT,
DEFAULT_PATTERN_DATA_COUNT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PATTERN_CENTER,
g_param_spec_double ("pattern-center", "Pattern center",
"The center of the black/white separation (0.0 = lowest, 1.0 highest)",
0.0, 1.0, DEFAULT_PATTERN_CENTER,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PATTERN_SENSITIVITY,
g_param_spec_double ("pattern-sensitivity", "Pattern sensitivity",
"The sensitivity around the center for detecting the markers "
"(0.0 = lowest, 1.0 highest)", 0.0, 1.0, DEFAULT_PATTERN_SENSITIVITY,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_LEFT_OFFSET,
g_param_spec_int ("left-offset", "Left Offset",
"The offset from the left border where the pattern starts", 0,
G_MAXINT, DEFAULT_LEFT_OFFSET,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_BOTTOM_OFFSET,
g_param_spec_int ("bottom-offset", "Bottom Offset",
"The offset from the bottom border where the pattern starts", 0,
G_MAXINT, DEFAULT_BOTTOM_OFFSET,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
}
static void
gst_video_detect_init (GstSimpleVideoMarkDetect * simplevideomarkdetect)
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{
}
void
gst_video_detect_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstSimpleVideoMarkDetect *simplevideomarkdetect =
GST_SIMPLE_VIDEO_MARK_DETECT (object);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "set_property");
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switch (property_id) {
case PROP_MESSAGE:
simplevideomarkdetect->message = g_value_get_boolean (value);
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break;
case PROP_PATTERN_WIDTH:
simplevideomarkdetect->pattern_width = g_value_get_int (value);
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break;
case PROP_PATTERN_HEIGHT:
simplevideomarkdetect->pattern_height = g_value_get_int (value);
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break;
case PROP_PATTERN_COUNT:
simplevideomarkdetect->pattern_count = g_value_get_int (value);
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break;
case PROP_PATTERN_DATA_COUNT:
simplevideomarkdetect->pattern_data_count = g_value_get_int (value);
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break;
case PROP_PATTERN_CENTER:
simplevideomarkdetect->pattern_center = g_value_get_double (value);
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break;
case PROP_PATTERN_SENSITIVITY:
simplevideomarkdetect->pattern_sensitivity = g_value_get_double (value);
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break;
case PROP_LEFT_OFFSET:
simplevideomarkdetect->left_offset = g_value_get_int (value);
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break;
case PROP_BOTTOM_OFFSET:
simplevideomarkdetect->bottom_offset = g_value_get_int (value);
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break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_video_detect_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstSimpleVideoMarkDetect *simplevideomarkdetect =
GST_SIMPLE_VIDEO_MARK_DETECT (object);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "get_property");
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switch (property_id) {
case PROP_MESSAGE:
g_value_set_boolean (value, simplevideomarkdetect->message);
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break;
case PROP_PATTERN_WIDTH:
g_value_set_int (value, simplevideomarkdetect->pattern_width);
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break;
case PROP_PATTERN_HEIGHT:
g_value_set_int (value, simplevideomarkdetect->pattern_height);
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break;
case PROP_PATTERN_COUNT:
g_value_set_int (value, simplevideomarkdetect->pattern_count);
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break;
case PROP_PATTERN_DATA_COUNT:
g_value_set_int (value, simplevideomarkdetect->pattern_data_count);
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break;
case PROP_PATTERN_CENTER:
g_value_set_double (value, simplevideomarkdetect->pattern_center);
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break;
case PROP_PATTERN_SENSITIVITY:
g_value_set_double (value, simplevideomarkdetect->pattern_sensitivity);
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break;
case PROP_LEFT_OFFSET:
g_value_set_int (value, simplevideomarkdetect->left_offset);
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break;
case PROP_BOTTOM_OFFSET:
g_value_set_int (value, simplevideomarkdetect->bottom_offset);
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break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_video_detect_dispose (GObject * object)
{
GstSimpleVideoMarkDetect *simplevideomarkdetect =
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);
}
void
gst_video_detect_finalize (GObject * object)
{
GstSimpleVideoMarkDetect *simplevideomarkdetect =
GST_SIMPLE_VIDEO_MARK_DETECT (object);
GST_DEBUG_OBJECT (simplevideomarkdetect, "finalize");
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/* clean up object here */
G_OBJECT_CLASS (gst_video_detect_parent_class)->finalize (object);
}
static gboolean
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gst_video_detect_start (GstBaseTransform * trans)
{
GstSimpleVideoMarkDetect *simplevideomarkdetect =
GST_SIMPLE_VIDEO_MARK_DETECT (trans);
GST_DEBUG_OBJECT (simplevideomarkdetect, "start");
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return TRUE;
}
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static gboolean
gst_video_detect_stop (GstBaseTransform * trans)
{
GstSimpleVideoMarkDetect *simplevideomarkdetect =
GST_SIMPLE_VIDEO_MARK_DETECT (trans);
GST_DEBUG_OBJECT (simplevideomarkdetect, "stop");
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return TRUE;
}
static gboolean
gst_video_detect_set_info (GstVideoFilter * filter, GstCaps * incaps,
GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
{
GstSimpleVideoMarkDetect *simplevideomarkdetect =
GST_SIMPLE_VIDEO_MARK_DETECT (filter);
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GST_DEBUG_OBJECT (simplevideomarkdetect, "set_info");
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return TRUE;
}
static void
gst_video_detect_post_message (GstSimpleVideoMarkDetect * simplevideomarkdetect,
GstBuffer * buffer, guint64 data)
{
GstBaseTransform *trans;
GstMessage *m;
guint64 duration, timestamp, running_time, stream_time;
trans = GST_BASE_TRANSFORM_CAST (simplevideomarkdetect);
/* get timestamps */
timestamp = GST_BUFFER_TIMESTAMP (buffer);
duration = GST_BUFFER_DURATION (buffer);
running_time = gst_segment_to_running_time (&trans->segment, GST_FORMAT_TIME,
timestamp);
stream_time = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
timestamp);
/* post message */
m = gst_message_new_element (GST_OBJECT_CAST (simplevideomarkdetect),
gst_structure_new ("GstSimpleVideoMarkDetect",
"have-pattern", G_TYPE_BOOLEAN, simplevideomarkdetect->in_pattern,
"timestamp", G_TYPE_UINT64, timestamp,
"stream-time", G_TYPE_UINT64, stream_time,
"running-time", G_TYPE_UINT64, running_time,
"duration", G_TYPE_UINT64, duration,
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"data", G_TYPE_UINT64, data, NULL));
gst_element_post_message (GST_ELEMENT_CAST (simplevideomarkdetect), m);
}
static gdouble
gst_video_detect_calc_brightness (GstSimpleVideoMarkDetect *
simplevideomarkdetect, guint8 * data, gint width, gint height,
gint row_stride, gint pixel_stride)
{
gint i, j;
guint64 sum;
sum = 0;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
sum += data[pixel_stride * j];
}
data += row_stride;
}
return sum / (255.0 * width * height);
}
static void
gst_video_detect_yuv (GstSimpleVideoMarkDetect * simplevideomarkdetect,
GstVideoFrame * frame)
{
gdouble brightness;
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gint i, pw, ph, row_stride, pixel_stride;
gint width, height, req_width, req_height;
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guint8 *d;
guint64 pattern_data;
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width = frame->info.width;
height = frame->info.height;
pw = simplevideomarkdetect->pattern_width;
ph = simplevideomarkdetect->pattern_height;
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row_stride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
pixel_stride = GST_VIDEO_FRAME_COMP_PSTRIDE (frame, 0);
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req_width =
(simplevideomarkdetect->pattern_count +
simplevideomarkdetect->pattern_data_count) * pw +
simplevideomarkdetect->left_offset;
req_height = simplevideomarkdetect->bottom_offset + ph;
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if (req_width > width || req_height > height) {
goto no_pattern;
}
/* analyse the bottom left pixels */
for (i = 0; i < simplevideomarkdetect->pattern_count; i++) {
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d = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
/* move to start of bottom left, adjust for offsets */
d += row_stride * (height - ph - simplevideomarkdetect->bottom_offset) +
pixel_stride * simplevideomarkdetect->left_offset;
/* move to i-th pattern */
d += pixel_stride * pw * i;
/* 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;
}
}
GST_DEBUG_OBJECT (simplevideomarkdetect, "found pattern");
pattern_data = 0;
/* get the data of the pattern */
for (i = 0; i < simplevideomarkdetect->pattern_data_count; i++) {
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d = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
/* move to start of bottom left, adjust for offsets */
d += row_stride * (height - ph - simplevideomarkdetect->bottom_offset) +
pixel_stride * simplevideomarkdetect->left_offset;
/* move after the fixed pattern */
d += pixel_stride * (simplevideomarkdetect->pattern_count * pw);
/* move to i-th pattern data */
d += pixel_stride * pw * i;
/* 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;
}
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
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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);
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return GST_FLOW_OK;
}