gstreamer/gst/videosignal/gstvideoanalyse.c

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/* GStreamer
* Copyright (C) <2006> 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-videoanalyse
*
* This plugin analyses every video frame and if the #GstVideoAnalyse:message
* property is #TRUE, posts an element message with video statistics called
* <classname>&quot;GstVideoAnalyse&quot;</classname>.
*
* The message's structure contains these fields:
* <itemizedlist>
* <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>
* #gdouble
* <classname>&quot;brightness&quot;</classname>:
* the average brightness of the frame.
* </para>
* </listitem>
* <listitem>
* <para>
* #gdouble
* <classname>&quot;brightness-variance&quot;</classname>:
* the brightness variance of the frame.
* </para>
* </listitem>
* </itemizedlist>
*
* <refsect2>
* <title>Example launch line</title>
* |[
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* gst-launch -m videotestsrc ! videoanalyse ! videoconvert ! ximagesink
* ]| This pipeline emits messages to the console for each frame that has been analysed.
* </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 "gstvideoanalyse.h"
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GST_DEBUG_CATEGORY_STATIC (gst_video_analyse_debug_category);
#define GST_CAT_DEFAULT gst_video_analyse_debug_category
/* prototypes */
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static void gst_video_analyse_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_video_analyse_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_video_analyse_finalize (GObject * object);
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static GstFlowReturn gst_video_analyse_transform_frame_ip (GstVideoFilter *
filter, GstVideoFrame * frame);
enum
{
PROP_0,
PROP_MESSAGE
};
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#define DEFAULT_MESSAGE TRUE
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#define VIDEO_CAPS \
GST_VIDEO_CAPS_MAKE("{ I420, YV12, Y444, Y42B, Y41B }")
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/* class initialization */
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G_DEFINE_TYPE_WITH_CODE (GstVideoAnalyse, gst_video_analyse,
GST_TYPE_VIDEO_FILTER,
GST_DEBUG_CATEGORY_INIT (gst_video_analyse_debug_category, "videoanalyse",
0, "debug category for videoanalyse element"));
static void
gst_video_analyse_class_init (GstVideoAnalyseClass * klass)
{
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GObjectClass *gobject_class = G_OBJECT_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 analyser", "Filter/Analyzer/Video",
"Analyse video signal", "Wim Taymans <wim@fluendo.com>");
gobject_class->set_property = gst_video_analyse_set_property;
gobject_class->get_property = gst_video_analyse_get_property;
gobject_class->finalize = gst_video_analyse_finalize;
video_filter_class->transform_frame_ip =
GST_DEBUG_FUNCPTR (gst_video_analyse_transform_frame_ip);
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));
//trans_class->passthrough_on_same_caps = TRUE;
}
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static void
gst_video_analyse_init (GstVideoAnalyse * videoanalyse)
{
}
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void
gst_video_analyse_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoAnalyse *videoanalyse = GST_VIDEO_ANALYSE (object);
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GST_DEBUG_OBJECT (videoanalyse, "set_property");
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switch (property_id) {
case PROP_MESSAGE:
videoanalyse->message = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
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void
gst_video_analyse_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstVideoAnalyse *videoanalyse = GST_VIDEO_ANALYSE (object);
GST_DEBUG_OBJECT (videoanalyse, "get_property");
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switch (property_id) {
case PROP_MESSAGE:
g_value_set_boolean (value, videoanalyse->message);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_video_analyse_finalize (GObject * object)
{
GstVideoAnalyse *videoanalyse = GST_VIDEO_ANALYSE (object);
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GST_DEBUG_OBJECT (videoanalyse, "finalize");
/* clean up object here */
G_OBJECT_CLASS (gst_video_analyse_parent_class)->finalize (object);
}
static void
gst_video_analyse_post_message (GstVideoAnalyse * videoanalyse,
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GstVideoFrame * frame)
{
GstBaseTransform *trans;
GstMessage *m;
guint64 duration, timestamp, running_time, stream_time;
trans = GST_BASE_TRANSFORM_CAST (videoanalyse);
/* get timestamps */
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timestamp = GST_BUFFER_TIMESTAMP (frame->buffer);
duration = GST_BUFFER_DURATION (frame->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);
m = gst_message_new_element (GST_OBJECT_CAST (videoanalyse),
gst_structure_new ("GstVideoAnalyse",
"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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"luma-average", G_TYPE_DOUBLE, videoanalyse->luma_average,
"luma-variance", G_TYPE_DOUBLE, videoanalyse->luma_variance, NULL));
gst_element_post_message (GST_ELEMENT_CAST (videoanalyse), m);
}
static void
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gst_video_analyse_planar (GstVideoAnalyse * videoanalyse, GstVideoFrame * frame)
{
guint64 sum;
gint avg, diff;
gint i, j;
guint8 *d;
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gint width = frame->info.width;
gint height = frame->info.height;
gint stride;
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d = frame->data[0];
stride = frame->info.stride[0];
sum = 0;
/* do brightness as average of pixel brightness in 0.0 to 1.0 */
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
sum += d[j];
}
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d += stride;
}
avg = sum / (width * height);
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videoanalyse->luma_average = sum / (255.0 * width * height);
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d = frame->data[0];
stride = frame->info.stride[0];
sum = 0;
/* do variance */
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
diff = (avg - d[j]);
sum += diff * diff;
}
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d += stride;
}
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videoanalyse->luma_variance = sum / (255.0 * 255.0 * width * height);
}
static GstFlowReturn
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gst_video_analyse_transform_frame_ip (GstVideoFilter * filter,
GstVideoFrame * frame)
{
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GstVideoAnalyse *videoanalyse = GST_VIDEO_ANALYSE (filter);
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GST_DEBUG_OBJECT (videoanalyse, "transform_frame_ip");
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gst_video_analyse_planar (videoanalyse, frame);
if (videoanalyse->message)
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gst_video_analyse_post_message (videoanalyse, frame);
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return GST_FLOW_OK;
}