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257 lines
7.7 KiB
C
257 lines
7.7 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., 51 Franklin Street, Suite 500,
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* Boston, MA 02110-1335, USA.
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*/
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/**
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* SECTION:element-videoanalyse
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* @title: 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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* `GstVideoAnalyse`.
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*
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* The message's structure contains these fields:
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*
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* * #GstClockTime `timestamp`: the timestamp of the buffer that triggered the message.
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*
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* * #GstClockTime `stream-time`: the stream time of the buffer.
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*
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* * #GstClockTime `running-time`: the running_time of the buffer.
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*
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* * #GstClockTime`duration`:the duration of the buffer.
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*
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* * #gdouble`luma-average`: the average brightness of the frame. Range: 0.0-1.0
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*
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* * #gdouble`luma-variance`: the brightness variance of the frame.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -m videotestsrc ! videoanalyse ! videoconvert ! ximagesink
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* ]| This pipeline emits messages to the console for each frame that has been analysed.
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*
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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 <gst/gst.h>
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#include <gst/video/video.h>
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#include <gst/video/gstvideofilter.h>
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#include "gstvideoanalyse.h"
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GST_DEBUG_CATEGORY_STATIC (gst_video_analyse_debug_category);
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#define GST_CAT_DEFAULT gst_video_analyse_debug_category
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/* prototypes */
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static void gst_video_analyse_set_property (GObject * object,
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guint property_id, const GValue * value, GParamSpec * pspec);
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static void gst_video_analyse_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec);
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static void gst_video_analyse_finalize (GObject * object);
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static GstFlowReturn gst_video_analyse_transform_frame_ip (GstVideoFilter *
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filter, GstVideoFrame * frame);
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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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#define DEFAULT_MESSAGE TRUE
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#define VIDEO_CAPS \
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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,
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GST_TYPE_VIDEO_FILTER,
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GST_DEBUG_CATEGORY_INIT (gst_video_analyse_debug_category, "videoanalyse",
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0, "debug category for videoanalyse element"));
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static void
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gst_video_analyse_class_init (GstVideoAnalyseClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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gst_caps_from_string (VIDEO_CAPS)));
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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gst_caps_from_string (VIDEO_CAPS)));
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gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
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"Video analyser", "Filter/Analyzer/Video",
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"Analyse video signal", "Wim Taymans <wim@fluendo.com>");
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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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gobject_class->finalize = gst_video_analyse_finalize;
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video_filter_class->transform_frame_ip =
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GST_DEBUG_FUNCPTR (gst_video_analyse_transform_frame_ip);
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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->passthrough_on_same_caps = TRUE;
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}
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static void
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gst_video_analyse_init (GstVideoAnalyse * videoanalyse)
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{
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}
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void
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gst_video_analyse_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstVideoAnalyse *videoanalyse = GST_VIDEO_ANALYSE (object);
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GST_DEBUG_OBJECT (videoanalyse, "set_property");
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switch (property_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, property_id, pspec);
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break;
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}
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}
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void
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gst_video_analyse_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstVideoAnalyse *videoanalyse = GST_VIDEO_ANALYSE (object);
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GST_DEBUG_OBJECT (videoanalyse, "get_property");
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switch (property_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, property_id, pspec);
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break;
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}
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}
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void
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gst_video_analyse_finalize (GObject * object)
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{
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GstVideoAnalyse *videoanalyse = GST_VIDEO_ANALYSE (object);
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GST_DEBUG_OBJECT (videoanalyse, "finalize");
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/* clean up object here */
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G_OBJECT_CLASS (gst_video_analyse_parent_class)->finalize (object);
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}
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static void
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gst_video_analyse_post_message (GstVideoAnalyse * videoanalyse,
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GstVideoFrame * frame)
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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 (frame->buffer);
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duration = GST_BUFFER_DURATION (frame->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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"luma-average", G_TYPE_DOUBLE, videoanalyse->luma_average,
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"luma-variance", G_TYPE_DOUBLE, videoanalyse->luma_variance, 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_planar (GstVideoAnalyse * videoanalyse, GstVideoFrame * frame)
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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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gint width = frame->info.width;
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gint height = frame->info.height;
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gint stride;
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d = frame->data[0];
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stride = frame->info.stride[0];
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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 += stride;
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}
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avg = sum / (width * height);
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videoanalyse->luma_average = sum / (255.0 * width * height);
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d = frame->data[0];
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stride = frame->info.stride[0];
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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 += stride;
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}
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videoanalyse->luma_variance = 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_frame_ip (GstVideoFilter * filter,
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GstVideoFrame * frame)
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{
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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);
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if (videoanalyse->message)
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gst_video_analyse_post_message (videoanalyse, frame);
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return GST_FLOW_OK;
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}
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