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
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, 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>
* |[
* gst-launch -m videotestsrc ! videoanalyse ! ffmpegcolorspace ! 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
#include "gstvideoanalyse.h"
#include <string.h>
#include <math.h>
#include <gst/video/video.h>
/* GstVideoAnalyse signals and args */
#define DEFAULT_MESSAGE TRUE
enum
{
PROP_0,
PROP_MESSAGE
};
GST_DEBUG_CATEGORY_STATIC (video_analyse_debug);
#define GST_CAT_DEFAULT video_analyse_debug
static GstStaticPadTemplate gst_video_analyse_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ I420, YV12 }"))
);
static GstStaticPadTemplate gst_video_analyse_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ I420, YV12 }"))
);
static GstVideoFilterClass *parent_class = NULL;
static gboolean
gst_video_analyse_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstVideoAnalyse *vf;
GstStructure *in_s;
gboolean ret;
vf = GST_VIDEO_ANALYSE (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);
return ret;
}
/* Useful macros */
#define GST_VIDEO_I420_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
#define GST_VIDEO_I420_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
#define GST_VIDEO_I420_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(GST_VIDEO_I420_Y_ROWSTRIDE(width)))/2)
#define GST_VIDEO_I420_Y_OFFSET(w,h) (0)
#define GST_VIDEO_I420_U_OFFSET(w,h) (GST_VIDEO_I420_Y_OFFSET(w,h)+(GST_VIDEO_I420_Y_ROWSTRIDE(w)*GST_ROUND_UP_2(h)))
#define GST_VIDEO_I420_V_OFFSET(w,h) (GST_VIDEO_I420_U_OFFSET(w,h)+(GST_VIDEO_I420_U_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
#define GST_VIDEO_I420_SIZE(w,h) (GST_VIDEO_I420_V_OFFSET(w,h)+(GST_VIDEO_I420_V_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
static void
gst_video_analyse_post_message (GstVideoAnalyse * videoanalyse,
GstBuffer * buffer)
{
GstBaseTransform *trans;
GstMessage *m;
guint64 duration, timestamp, running_time, stream_time;
trans = GST_BASE_TRANSFORM_CAST (videoanalyse);
/* 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);
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,
"brightness", G_TYPE_DOUBLE, videoanalyse->brightness,
"brightness-variance", G_TYPE_DOUBLE, videoanalyse->brightness_var,
NULL));
gst_element_post_message (GST_ELEMENT_CAST (videoanalyse), m);
}
static void
gst_video_analyse_420 (GstVideoAnalyse * videoanalyse, guint8 * data,
gint width, gint height)
{
guint64 sum;
gint avg, diff;
gint i, j;
guint8 *d;
d = data;
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];
}
d += GST_VIDEO_I420_Y_ROWSTRIDE (width);
}
avg = sum / (width * height);
videoanalyse->brightness = sum / (255.0 * width * height);
d = data;
sum = 0;
/* do variance */
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
diff = (avg - d[j]);
sum += diff * diff;
}
d += GST_VIDEO_I420_Y_ROWSTRIDE (width);
}
videoanalyse->brightness_var = sum / (255.0 * 255.0 * width * height);
}
static GstFlowReturn
gst_video_analyse_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstVideoAnalyse *videoanalyse;
GstFlowReturn ret = GST_FLOW_OK;
guint8 *data;
videoanalyse = GST_VIDEO_ANALYSE (trans);
data = GST_BUFFER_DATA (buf);
gst_video_analyse_420 (videoanalyse, data, videoanalyse->width,
videoanalyse->height);
if (videoanalyse->message)
gst_video_analyse_post_message (videoanalyse, buf);
return ret;
}
static void
gst_video_analyse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoAnalyse *videoanalyse;
videoanalyse = GST_VIDEO_ANALYSE (object);
switch (prop_id) {
case PROP_MESSAGE:
videoanalyse->message = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_analyse_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVideoAnalyse *videoanalyse;
videoanalyse = GST_VIDEO_ANALYSE (object);
switch (prop_id) {
case PROP_MESSAGE:
g_value_set_boolean (value, videoanalyse->message);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_analyse_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "Video analyser",
"Filter/Analyzer/Video",
"Analyse video signal", "Wim Taymans <wim@fluendo.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_analyse_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_video_analyse_src_template));
}
static void
gst_video_analyse_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_analyse_set_property;
gobject_class->get_property = gst_video_analyse_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));
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_analyse_set_caps);
trans_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_video_analyse_transform_ip);
trans_class->passthrough_on_same_caps = TRUE;
}
static void
gst_video_analyse_init (GTypeInstance * instance, gpointer g_class)
{
GstVideoAnalyse *videoanalyse;
videoanalyse = GST_VIDEO_ANALYSE (instance);
GST_DEBUG_OBJECT (videoanalyse, "gst_video_analyse_init");
}
GType
gst_video_analyse_get_type (void)
{
static GType video_analyse_type = 0;
if (!video_analyse_type) {
static const GTypeInfo video_analyse_info = {
sizeof (GstVideoAnalyseClass),
gst_video_analyse_base_init,
NULL,
gst_video_analyse_class_init,
NULL,
NULL,
sizeof (GstVideoAnalyse),
0,
gst_video_analyse_init,
};
video_analyse_type = g_type_register_static (GST_TYPE_VIDEO_FILTER,
"GstVideoAnalyse", &video_analyse_info, 0);
GST_DEBUG_CATEGORY_INIT (video_analyse_debug, "videoanalyse", 0,
"Video Analyse element");
}
return video_analyse_type;
}