gstreamer/gst/videosignal/gstvideodetect.c

549 lines
18 KiB
C

/* 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
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-videodetect
* @see_also: #GstVideoMark
*
* This plugin detects #GstVideoDetect:pattern-count squares in the bottom left
* corner of the video frames. The squares have a width and height of
* respectively #GstVideoDetect:pattern-width and #GstVideoDetect:pattern-height.
* Even squares must be black and odd squares must be white.
*
* When the pattern has been found, #GstVideoDetect: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;GstVideoDetect&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 #GstVideoDetect: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-uint64&quot;</classname>:
* the data-pattern found after the pattern or 0 when have-signal is #FALSE.
* </para>
* </listitem>
* <listitem>
* <para>
* #guint
* <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 ! videodetect ! videoconvert ! ximagesink
* ]|
* </refsect2>
*
* Last reviewed on 2007-05-30 (0.10.5)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvideodetect.h"
#include <string.h>
#include <math.h>
#include <gst/video/video.h>
/* GstVideoDetect signals and args */
#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
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
};
GST_DEBUG_CATEGORY_STATIC (video_detect_debug);
#define GST_CAT_DEFAULT video_detect_debug
static GstStaticPadTemplate gst_video_detect_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV
("{ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }"))
);
static GstStaticPadTemplate gst_video_detect_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV
("{ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }"))
);
static GstVideoFilterClass *parent_class = NULL;
static gboolean
gst_video_detect_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstVideoDetect *vf;
GstStructure *in_s;
guint32 fourcc;
gboolean ret;
vf = GST_VIDEO_DETECT (btrans);
in_s = gst_caps_get_structure (incaps, 0);
ret = gst_structure_get_int (in_s, "width", &vf->width);
ret &= gst_structure_get_int (in_s, "height", &vf->height);
ret &= gst_structure_get_fourcc (in_s, "format", &fourcc);
if (ret)
vf->format = gst_video_format_from_fourcc (fourcc);
return ret;
}
static void
gst_video_detect_post_message (GstVideoDetect * videodetect, GstBuffer * buffer,
guint64 data)
{
GstBaseTransform *trans;
GstMessage *m;
guint64 duration, timestamp, running_time, stream_time;
trans = GST_BASE_TRANSFORM_CAST (videodetect);
/* 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 (videodetect),
gst_structure_new ("GstVideoDetect",
"have-pattern", G_TYPE_BOOLEAN, videodetect->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,
"data-uint64", G_TYPE_UINT64, data,
"data", G_TYPE_UINT, (guint) MIN (data, G_MAXINT), NULL));
gst_element_post_message (GST_ELEMENT_CAST (videodetect), m);
}
static gdouble
gst_video_detect_calc_brightness (GstVideoDetect * videodetect, 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 (GstVideoDetect * videodetect, GstBuffer * buffer)
{
GstVideoFormat format;
gdouble brightness;
gint i, pw, ph, row_stride, pixel_stride, offset;
gint width, height, req_width, req_height;
guint8 *d, *data;
guint64 pattern_data;
data = GST_BUFFER_DATA (buffer);
format = videodetect->format;
width = videodetect->width;
height = videodetect->height;
pw = videodetect->pattern_width;
ph = videodetect->pattern_height;
row_stride = gst_video_format_get_row_stride (format, 0, width);
pixel_stride = gst_video_format_get_pixel_stride (format, 0);
offset = gst_video_format_get_component_offset (format, 0, width, height);
req_width =
(videodetect->pattern_count + videodetect->pattern_data_count) * pw +
videodetect->left_offset;
req_height = videodetect->bottom_offset + ph;
if (req_width > width || req_height > height) {
goto no_pattern;
}
/* analyse the bottom left pixels */
for (i = 0; i < videodetect->pattern_count; i++) {
d = data + offset;
/* move to start of bottom left, adjust for offsets */
d += row_stride * (height - ph - videodetect->bottom_offset) +
pixel_stride * videodetect->left_offset;
/* move to i-th pattern */
d += pixel_stride * pw * i;
/* calc brightness of width * height box */
brightness = gst_video_detect_calc_brightness (videodetect, d, pw, ph,
row_stride, pixel_stride);
GST_DEBUG_OBJECT (videodetect, "brightness %f", brightness);
if (i & 1) {
/* odd pixels must be white, all pixels darker than the center +
* sensitivity are considered wrong. */
if (brightness <
(videodetect->pattern_center + videodetect->pattern_sensitivity))
goto no_pattern;
} else {
/* even pixels must be black, pixels lighter than the center - sensitivity
* are considered wrong. */
if (brightness >
(videodetect->pattern_center - videodetect->pattern_sensitivity))
goto no_pattern;
}
}
GST_DEBUG_OBJECT (videodetect, "found pattern");
pattern_data = 0;
/* get the data of the pattern */
for (i = 0; i < videodetect->pattern_data_count; i++) {
d = data + offset;
/* move to start of bottom left, adjust for offsets */
d += row_stride * (height - ph - videodetect->bottom_offset) +
pixel_stride * videodetect->left_offset;
/* move after the fixed pattern */
d += pixel_stride * (videodetect->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 (videodetect, 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 > videodetect->pattern_center)
pattern_data |= 1;
}
GST_DEBUG_OBJECT (videodetect, "have data %" G_GUINT64_FORMAT, pattern_data);
videodetect->in_pattern = TRUE;
gst_video_detect_post_message (videodetect, buffer, pattern_data);
return;
no_pattern:
{
GST_DEBUG_OBJECT (videodetect, "no pattern found");
if (videodetect->in_pattern) {
videodetect->in_pattern = FALSE;
gst_video_detect_post_message (videodetect, buffer, 0);
}
return;
}
}
static GstFlowReturn
gst_video_detect_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstVideoDetect *videodetect;
GstFlowReturn ret = GST_FLOW_OK;
videodetect = GST_VIDEO_DETECT (trans);
gst_video_detect_yuv (videodetect, buf);
return ret;
}
static void
gst_video_detect_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoDetect *videodetect;
videodetect = GST_VIDEO_DETECT (object);
switch (prop_id) {
case PROP_MESSAGE:
videodetect->message = g_value_get_boolean (value);
break;
case PROP_PATTERN_WIDTH:
videodetect->pattern_width = g_value_get_int (value);
break;
case PROP_PATTERN_HEIGHT:
videodetect->pattern_height = g_value_get_int (value);
break;
case PROP_PATTERN_COUNT:
videodetect->pattern_count = g_value_get_int (value);
break;
case PROP_PATTERN_DATA_COUNT:
videodetect->pattern_data_count = g_value_get_int (value);
break;
case PROP_PATTERN_CENTER:
videodetect->pattern_center = g_value_get_double (value);
break;
case PROP_PATTERN_SENSITIVITY:
videodetect->pattern_sensitivity = g_value_get_double (value);
break;
case PROP_LEFT_OFFSET:
videodetect->left_offset = g_value_get_int (value);
break;
case PROP_BOTTOM_OFFSET:
videodetect->bottom_offset = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_detect_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVideoDetect *videodetect;
videodetect = GST_VIDEO_DETECT (object);
switch (prop_id) {
case PROP_MESSAGE:
g_value_set_boolean (value, videodetect->message);
break;
case PROP_PATTERN_WIDTH:
g_value_set_int (value, videodetect->pattern_width);
break;
case PROP_PATTERN_HEIGHT:
g_value_set_int (value, videodetect->pattern_height);
break;
case PROP_PATTERN_COUNT:
g_value_set_int (value, videodetect->pattern_count);
break;
case PROP_PATTERN_DATA_COUNT:
g_value_set_int (value, videodetect->pattern_data_count);
break;
case PROP_PATTERN_CENTER:
g_value_set_double (value, videodetect->pattern_center);
break;
case PROP_PATTERN_SENSITIVITY:
g_value_set_double (value, videodetect->pattern_sensitivity);
break;
case PROP_LEFT_OFFSET:
g_value_set_int (value, videodetect->left_offset);
break;
case PROP_BOTTOM_OFFSET:
g_value_set_int (value, videodetect->bottom_offset);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_detect_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_metadata (element_class, "Video detecter",
"Filter/Effect/Video",
"Detect patterns in a video signal", "Wim Taymans <wim@fluendo.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_detect_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_detect_src_template));
}
static void
gst_video_detect_class_init (gpointer klass, gpointer class_data)
{
GObjectClass *gobject_class;
GstBaseTransformClass *trans_class;
gobject_class = (GObjectClass *) klass;
trans_class = (GstBaseTransformClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_video_detect_set_property;
gobject_class->get_property = gst_video_detect_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MESSAGE,
g_param_spec_boolean ("message", "Message",
"Post statics 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));
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_detect_set_caps);
trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_video_detect_transform_ip);
trans_class->passthrough_on_same_caps = TRUE;
GST_DEBUG_CATEGORY_INIT (video_detect_debug, "videodetect", 0,
"Video detect");
}
static void
gst_video_detect_init (GTypeInstance * instance, gpointer g_class)
{
GstVideoDetect *videodetect;
videodetect = GST_VIDEO_DETECT (instance);
GST_DEBUG_OBJECT (videodetect, "gst_video_detect_init");
videodetect->in_pattern = FALSE;
}
GType
gst_video_detect_get_type (void)
{
static GType video_detect_type = 0;
if (!video_detect_type) {
static const GTypeInfo video_detect_info = {
sizeof (GstVideoDetectClass),
gst_video_detect_base_init,
NULL,
gst_video_detect_class_init,
NULL,
NULL,
sizeof (GstVideoDetect),
0,
gst_video_detect_init,
};
video_detect_type = g_type_register_static (GST_TYPE_VIDEO_FILTER,
"GstVideoDetect", &video_detect_info, 0);
}
return video_detect_type;
}