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349 lines
9.6 KiB
C
349 lines
9.6 KiB
C
/* GStreamer
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* Copyright (C) <2006> 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-videoanalyse
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*
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* This plugin analyses every video frame and if the #GstVideoAnalyse:message
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* property is #TRUE, posts an element message with video statistics called
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* <classname>"GstVideoAnalyse"</classname>.
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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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* #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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* #gdouble
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* <classname>"brightness"</classname>:
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* the average brightness of the frame.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* #gdouble
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* <classname>"brightness-variance"</classname>:
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* the brightness variance of the frame.
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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 -m videotestsrc ! videoanalyse ! ffmpegcolorspace ! ximagesink
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* ]| This pipeline emits messages to the console for each frame that has been analysed.
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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 "gstvideoanalyse.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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/* GstVideoAnalyse signals and args */
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#define DEFAULT_MESSAGE TRUE
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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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};
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GST_DEBUG_CATEGORY_STATIC (video_analyse_debug);
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#define GST_CAT_DEFAULT video_analyse_debug
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static GstStaticPadTemplate gst_video_analyse_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 ("{ I420, YV12 }"))
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);
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static GstStaticPadTemplate gst_video_analyse_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 ("{ I420, YV12 }"))
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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_analyse_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstVideoAnalyse *vf;
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GstStructure *in_s;
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gboolean ret;
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vf = GST_VIDEO_ANALYSE (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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return ret;
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}
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/* Useful macros */
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#define GST_VIDEO_I420_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
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#define GST_VIDEO_I420_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
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#define GST_VIDEO_I420_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(GST_VIDEO_I420_Y_ROWSTRIDE(width)))/2)
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#define GST_VIDEO_I420_Y_OFFSET(w,h) (0)
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#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)))
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#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))
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#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))
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static void
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gst_video_analyse_post_message (GstVideoAnalyse * videoanalyse,
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GstBuffer * buffer)
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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 (videoanalyse);
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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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m = gst_message_new_element (GST_OBJECT_CAST (videoanalyse),
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gst_structure_new ("GstVideoAnalyse",
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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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"brightness", G_TYPE_DOUBLE, videoanalyse->brightness,
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"brightness-variance", G_TYPE_DOUBLE, videoanalyse->brightness_var,
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NULL));
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gst_element_post_message (GST_ELEMENT_CAST (videoanalyse), m);
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}
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static void
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gst_video_analyse_420 (GstVideoAnalyse * videoanalyse, guint8 * data,
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gint width, gint height)
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{
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guint64 sum;
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gint avg, diff;
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gint i, j;
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guint8 *d;
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d = data;
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sum = 0;
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/* do brightness as average of pixel brightness in 0.0 to 1.0 */
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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 += d[j];
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}
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d += GST_VIDEO_I420_Y_ROWSTRIDE (width);
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}
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avg = sum / (width * height);
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videoanalyse->brightness = sum / (255.0 * width * height);
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d = data;
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sum = 0;
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/* do variance */
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for (i = 0; i < height; i++) {
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for (j = 0; j < width; j++) {
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diff = (avg - d[j]);
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sum += diff * diff;
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}
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d += GST_VIDEO_I420_Y_ROWSTRIDE (width);
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}
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videoanalyse->brightness_var = sum / (255.0 * 255.0 * width * height);
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}
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static GstFlowReturn
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gst_video_analyse_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
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{
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GstVideoAnalyse *videoanalyse;
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GstFlowReturn ret = GST_FLOW_OK;
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guint8 *data;
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videoanalyse = GST_VIDEO_ANALYSE (trans);
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data = GST_BUFFER_DATA (buf);
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gst_video_analyse_420 (videoanalyse, data, videoanalyse->width,
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videoanalyse->height);
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if (videoanalyse->message)
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gst_video_analyse_post_message (videoanalyse, buf);
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return ret;
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}
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static void
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gst_video_analyse_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstVideoAnalyse *videoanalyse;
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videoanalyse = GST_VIDEO_ANALYSE (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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videoanalyse->message = g_value_get_boolean (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_analyse_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstVideoAnalyse *videoanalyse;
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videoanalyse = GST_VIDEO_ANALYSE (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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g_value_set_boolean (value, videoanalyse->message);
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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_analyse_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 analyser",
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"Filter/Analyzer/Video",
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"Analyse 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_analyse_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_analyse_src_template));
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}
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static void
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gst_video_analyse_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_analyse_set_property;
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gobject_class->get_property = gst_video_analyse_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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trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_analyse_set_caps);
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trans_class->transform_ip =
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GST_DEBUG_FUNCPTR (gst_video_analyse_transform_ip);
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trans_class->passthrough_on_same_caps = TRUE;
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}
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static void
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gst_video_analyse_init (GTypeInstance * instance, gpointer g_class)
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{
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GstVideoAnalyse *videoanalyse;
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videoanalyse = GST_VIDEO_ANALYSE (instance);
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GST_DEBUG_OBJECT (videoanalyse, "gst_video_analyse_init");
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}
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GType
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gst_video_analyse_get_type (void)
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{
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static GType video_analyse_type = 0;
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if (!video_analyse_type) {
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static const GTypeInfo video_analyse_info = {
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sizeof (GstVideoAnalyseClass),
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gst_video_analyse_base_init,
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NULL,
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gst_video_analyse_class_init,
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NULL,
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NULL,
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sizeof (GstVideoAnalyse),
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0,
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gst_video_analyse_init,
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};
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video_analyse_type = g_type_register_static (GST_TYPE_VIDEO_FILTER,
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"GstVideoAnalyse", &video_analyse_info, 0);
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GST_DEBUG_CATEGORY_INIT (video_analyse_debug, "videoanalyse", 0,
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"Video Analyse element");
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}
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return video_analyse_type;
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}
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