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549 lines
18 KiB
C
549 lines
18 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-videodetect
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* @see_also: #GstVideoMark
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*
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* This plugin detects #GstVideoDetect: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 #GstVideoDetect:pattern-width and #GstVideoDetect: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, #GstVideoDetect: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 <classname>"GstVideoDetect"</classname> 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 #GstVideoDetect:message property is #TRUE.
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*
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* The message's structure contains these fields:
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* <itemizedlist>
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* <listitem>
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* <para>
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* #gboolean
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* <classname>"have-pattern"</classname>:
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* 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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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"timestamp"</classname>:
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* the timestamp of the buffer that triggered the message.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"stream-time"</classname>:
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* the stream time of the buffer.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"running-time"</classname>:
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* the running_time of the buffer.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"duration"</classname>:
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* the duration of the buffer.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #guint64
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* <classname>"data-uint64"</classname>:
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* the data-pattern found after the pattern or 0 when have-signal is #FALSE.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #guint
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* <classname>"data"</classname>:
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* the data-pattern found after the pattern or 0 when have-signal is #FALSE.
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* </para>
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* </listitem>
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* </itemizedlist>
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch videotestsrc ! videodetect ! ffmpegcolorspace ! ximagesink
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* ]|
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* </refsect2>
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*
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* Last reviewed on 2007-05-30 (0.10.5)
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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 "gstvideodetect.h"
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#include <string.h>
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#include <math.h>
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#include <gst/video/video.h>
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/* GstVideoDetect signals and args */
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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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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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GST_DEBUG_CATEGORY_STATIC (video_detect_debug);
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#define GST_CAT_DEFAULT video_detect_debug
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static GstStaticPadTemplate gst_video_detect_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV
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("{ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }"))
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);
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static GstStaticPadTemplate gst_video_detect_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV
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("{ I420, YV12, Y41B, Y42B, Y444, YUY2, UYVY, AYUV, YVYU }"))
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);
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static GstVideoFilterClass *parent_class = NULL;
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static gboolean
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gst_video_detect_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstVideoDetect *vf;
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GstStructure *in_s;
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guint32 fourcc;
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gboolean ret;
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vf = GST_VIDEO_DETECT (btrans);
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in_s = gst_caps_get_structure (incaps, 0);
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ret = gst_structure_get_int (in_s, "width", &vf->width);
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ret &= gst_structure_get_int (in_s, "height", &vf->height);
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ret &= gst_structure_get_fourcc (in_s, "format", &fourcc);
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if (ret)
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vf->format = gst_video_format_from_fourcc (fourcc);
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return ret;
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}
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static void
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gst_video_detect_post_message (GstVideoDetect * videodetect, GstBuffer * buffer,
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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 (videodetect);
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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 (videodetect),
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gst_structure_new ("GstVideoDetect",
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"have-pattern", G_TYPE_BOOLEAN, videodetect->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-uint64", G_TYPE_UINT64, data,
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"data", G_TYPE_UINT, (guint) MIN (data, G_MAXINT), NULL));
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gst_element_post_message (GST_ELEMENT_CAST (videodetect), m);
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}
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static gdouble
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gst_video_detect_calc_brightness (GstVideoDetect * videodetect, guint8 * data,
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gint width, gint height, 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 void
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gst_video_detect_yuv (GstVideoDetect * videodetect, GstBuffer * buffer)
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{
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GstVideoFormat format;
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gdouble brightness;
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gint i, pw, ph, row_stride, pixel_stride, offset;
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gint width, height, req_width, req_height;
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guint8 *d, *data;
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guint64 pattern_data;
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data = GST_BUFFER_DATA (buffer);
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format = videodetect->format;
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width = videodetect->width;
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height = videodetect->height;
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pw = videodetect->pattern_width;
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ph = videodetect->pattern_height;
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row_stride = gst_video_format_get_row_stride (format, 0, width);
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pixel_stride = gst_video_format_get_pixel_stride (format, 0);
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offset = gst_video_format_get_component_offset (format, 0, width, height);
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req_width =
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(videodetect->pattern_count + videodetect->pattern_data_count) * pw +
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videodetect->left_offset;
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req_height = videodetect->bottom_offset + ph;
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if (req_width > width || req_height > height) {
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goto no_pattern;
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}
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/* analyse the bottom left pixels */
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for (i = 0; i < videodetect->pattern_count; i++) {
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d = data + offset;
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/* move to start of bottom left, adjust for offsets */
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d += row_stride * (height - ph - videodetect->bottom_offset) +
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pixel_stride * videodetect->left_offset;
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/* move to i-th pattern */
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d += pixel_stride * pw * i;
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/* calc brightness of width * height box */
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brightness = gst_video_detect_calc_brightness (videodetect, d, pw, ph,
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row_stride, pixel_stride);
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GST_DEBUG_OBJECT (videodetect, "brightness %f", brightness);
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if (i & 1) {
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/* odd pixels must be white, all pixels darker than the center +
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* sensitivity are considered wrong. */
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if (brightness <
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(videodetect->pattern_center + videodetect->pattern_sensitivity))
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goto no_pattern;
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} else {
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/* even pixels must be black, pixels lighter than the center - sensitivity
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* are considered wrong. */
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if (brightness >
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(videodetect->pattern_center - videodetect->pattern_sensitivity))
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goto no_pattern;
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}
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}
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GST_DEBUG_OBJECT (videodetect, "found pattern");
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pattern_data = 0;
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/* get the data of the pattern */
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for (i = 0; i < videodetect->pattern_data_count; i++) {
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d = data + offset;
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/* move to start of bottom left, adjust for offsets */
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d += row_stride * (height - ph - videodetect->bottom_offset) +
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pixel_stride * videodetect->left_offset;
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/* move after the fixed pattern */
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d += pixel_stride * (videodetect->pattern_count * pw);
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/* move to i-th pattern data */
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d += pixel_stride * pw * i;
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/* calc brightness of width * height box */
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brightness = gst_video_detect_calc_brightness (videodetect, d, pw, ph,
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row_stride, pixel_stride);
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/* update pattern, we just use the center to decide between black and white. */
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pattern_data <<= 1;
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if (brightness > videodetect->pattern_center)
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pattern_data |= 1;
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}
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GST_DEBUG_OBJECT (videodetect, "have data %" G_GUINT64_FORMAT, pattern_data);
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videodetect->in_pattern = TRUE;
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gst_video_detect_post_message (videodetect, buffer, pattern_data);
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return;
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no_pattern:
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{
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GST_DEBUG_OBJECT (videodetect, "no pattern found");
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if (videodetect->in_pattern) {
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videodetect->in_pattern = FALSE;
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gst_video_detect_post_message (videodetect, buffer, 0);
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}
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return;
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}
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}
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static GstFlowReturn
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gst_video_detect_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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{
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GstVideoDetect *videodetect;
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GstFlowReturn ret = GST_FLOW_OK;
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videodetect = GST_VIDEO_DETECT (trans);
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gst_video_detect_yuv (videodetect, buf);
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return ret;
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}
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static void
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gst_video_detect_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstVideoDetect *videodetect;
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videodetect = GST_VIDEO_DETECT (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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videodetect->message = g_value_get_boolean (value);
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break;
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case PROP_PATTERN_WIDTH:
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videodetect->pattern_width = g_value_get_int (value);
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break;
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case PROP_PATTERN_HEIGHT:
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videodetect->pattern_height = g_value_get_int (value);
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break;
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case PROP_PATTERN_COUNT:
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videodetect->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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videodetect->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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videodetect->pattern_center = g_value_get_double (value);
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break;
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case PROP_PATTERN_SENSITIVITY:
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videodetect->pattern_sensitivity = g_value_get_double (value);
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break;
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case PROP_LEFT_OFFSET:
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videodetect->left_offset = g_value_get_int (value);
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break;
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case PROP_BOTTOM_OFFSET:
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videodetect->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, prop_id, pspec);
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break;
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}
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}
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static void
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gst_video_detect_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstVideoDetect *videodetect;
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videodetect = GST_VIDEO_DETECT (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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g_value_set_boolean (value, videodetect->message);
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break;
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case PROP_PATTERN_WIDTH:
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g_value_set_int (value, videodetect->pattern_width);
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break;
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case PROP_PATTERN_HEIGHT:
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g_value_set_int (value, videodetect->pattern_height);
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break;
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case PROP_PATTERN_COUNT:
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g_value_set_int (value, videodetect->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, videodetect->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, videodetect->pattern_center);
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break;
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case PROP_PATTERN_SENSITIVITY:
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g_value_set_double (value, videodetect->pattern_sensitivity);
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break;
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case PROP_LEFT_OFFSET:
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g_value_set_int (value, videodetect->left_offset);
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break;
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case PROP_BOTTOM_OFFSET:
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g_value_set_int (value, videodetect->bottom_offset);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_video_detect_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (element_class, "Video detecter",
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"Filter/Effect/Video",
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"Detect patterns in a video signal", "Wim Taymans <wim@fluendo.com>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_video_detect_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_video_detect_src_template));
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}
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static void
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gst_video_detect_class_init (gpointer klass, gpointer class_data)
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{
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GObjectClass *gobject_class;
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GstBaseTransformClass *trans_class;
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gobject_class = (GObjectClass *) klass;
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trans_class = (GstBaseTransformClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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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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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 statics 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,
|
|
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;
|
|
}
|