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173 lines
5.6 KiB
C
173 lines
5.6 KiB
C
/* GStreamer
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* Copyright (C) 2013 David Schleef <ds@schleef.org>
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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-videodiff
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* @title: gstvideodiff
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*
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* The videodiff element highlights the difference between a frame and its
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* previous on the luma plane.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc pattern=ball ! videodiff ! videoconvert ! autovideosink
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* ]|
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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 "gstvideodiff.h"
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GST_DEBUG_CATEGORY_STATIC (gst_video_diff_debug_category);
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#define GST_CAT_DEFAULT gst_video_diff_debug_category
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/* prototypes */
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static GstFlowReturn gst_video_diff_transform_frame (GstVideoFilter * filter,
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GstVideoFrame * inframe, GstVideoFrame * outframe);
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#define VIDEO_SRC_CAPS \
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GST_VIDEO_CAPS_MAKE("{ I420, Y444, Y42B, Y41B }")
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#define VIDEO_SINK_CAPS \
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GST_VIDEO_CAPS_MAKE("{ I420, Y444, Y42B, Y41B }")
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G_DEFINE_TYPE_WITH_CODE (GstVideoDiff, gst_video_diff, GST_TYPE_VIDEO_FILTER,
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GST_DEBUG_CATEGORY_INIT (gst_video_diff_debug_category, "videodiff", 0,
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"debug category for videodiff element"));
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GST_ELEMENT_REGISTER_DEFINE (videodiff, "videodiff",
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GST_RANK_NONE, GST_TYPE_VIDEO_DIFF);
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static void
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gst_video_diff_class_init (GstVideoDiffClass * klass)
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{
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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_SRC_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_SINK_CAPS)));
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gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
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"Video Diff", "Video/Filter",
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"Visualize differences between adjacent video frames",
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"David Schleef <ds@schleef.org>");
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video_filter_class->transform_frame =
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GST_DEBUG_FUNCPTR (gst_video_diff_transform_frame);
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}
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static void
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gst_video_diff_init (GstVideoDiff * videodiff)
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{
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videodiff->threshold = 10;
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}
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static GstFlowReturn
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gst_video_diff_transform_frame_ip_planarY (GstVideoDiff * videodiff,
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GstVideoFrame * outframe, GstVideoFrame * inframe, GstVideoFrame * oldframe)
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{
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int width = inframe->info.width;
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int height = inframe->info.height;
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int i, j;
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int threshold = videodiff->threshold;
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int t = videodiff->t;
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for (j = 0; j < height; j++) {
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guint8 *d = (guint8 *) outframe->data[0] + outframe->info.stride[0] * j;
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guint8 *s1 = (guint8 *) oldframe->data[0] + oldframe->info.stride[0] * j;
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guint8 *s2 = (guint8 *) inframe->data[0] + inframe->info.stride[0] * j;
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for (i = 0; i < width; i++) {
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if ((s2[i] < s1[i] - threshold) || (s2[i] > s1[i] + threshold)) {
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if ((i + j + t) & 0x4) {
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d[i] = 16;
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} else {
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d[i] = 240;
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}
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} else {
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d[i] = s2[i];
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}
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}
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}
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for (j = 0; j < GST_VIDEO_FRAME_COMP_HEIGHT (inframe, 1); j++) {
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guint8 *d = (guint8 *) outframe->data[1] + outframe->info.stride[1] * j;
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guint8 *s = (guint8 *) inframe->data[1] + inframe->info.stride[1] * j;
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memcpy (d, s, GST_VIDEO_FRAME_COMP_WIDTH (inframe, 1));
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}
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for (j = 0; j < GST_VIDEO_FRAME_COMP_HEIGHT (inframe, 2); j++) {
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guint8 *d = (guint8 *) outframe->data[2] + outframe->info.stride[2] * j;
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guint8 *s = (guint8 *) inframe->data[2] + inframe->info.stride[2] * j;
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memcpy (d, s, GST_VIDEO_FRAME_COMP_WIDTH (inframe, 2));
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}
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return GST_FLOW_OK;
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}
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static GstFlowReturn
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gst_video_diff_transform_frame (GstVideoFilter * filter,
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GstVideoFrame * inframe, GstVideoFrame * outframe)
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{
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GstVideoDiff *videodiff = GST_VIDEO_DIFF (filter);
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GST_DEBUG_OBJECT (videodiff, "transform_frame_ip");
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if (videodiff->previous_buffer) {
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GstVideoFrame oldframe;
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gst_video_frame_map (&oldframe, &videodiff->oldinfo,
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videodiff->previous_buffer, GST_MAP_READ);
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switch (inframe->info.finfo->format) {
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case GST_VIDEO_FORMAT_I420:
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case GST_VIDEO_FORMAT_Y41B:
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case GST_VIDEO_FORMAT_Y444:
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case GST_VIDEO_FORMAT_Y42B:
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gst_video_diff_transform_frame_ip_planarY (videodiff, outframe,
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inframe, &oldframe);
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break;
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default:
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g_assert_not_reached ();
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}
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gst_video_frame_unmap (&oldframe);
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gst_buffer_unref (videodiff->previous_buffer);
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} else {
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int k;
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int j;
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for (k = 0; k < 3; k++) {
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for (j = 0; j < GST_VIDEO_FRAME_COMP_HEIGHT (inframe, k); j++) {
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guint8 *d = (guint8 *) outframe->data[k] + outframe->info.stride[k] * j;
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guint8 *s = (guint8 *) inframe->data[k] + inframe->info.stride[k] * j;
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memcpy (d, s, GST_VIDEO_FRAME_COMP_WIDTH (inframe, k));
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}
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}
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}
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videodiff->previous_buffer = gst_buffer_ref (inframe->buffer);
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memcpy (&videodiff->oldinfo, &inframe->info, sizeof (GstVideoInfo));
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return GST_FLOW_OK;
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}
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