/* GStreamer * Copyright (C) 2013 Rdio, Inc. * * 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., 51 Franklin Street, Suite 500, * Boston, MA 02110-1335, USA. */ /** * SECTION:element-gstcombdetect * * The combdetect element detects if combing artifacts are present in * a raw video stream, and if so, marks them with a zebra stripe * pattern. * * * Example launch line * |[ * gst-launch-1.0 -v filesrc location=file.mov ! decodebin ! combdetect ! * xvimagesink * ]| * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "gstcombdetect.h" #include GST_DEBUG_CATEGORY_STATIC (gst_comb_detect_debug_category); #define GST_CAT_DEFAULT gst_comb_detect_debug_category /* prototypes */ static GstCaps *gst_comb_detect_transform_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter); static gboolean gst_comb_detect_set_info (GstVideoFilter * filter, GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info); static GstFlowReturn gst_comb_detect_transform_frame (GstVideoFilter * filter, GstVideoFrame * inframe, GstVideoFrame * outframe); enum { PROP_0 }; /* pad templates */ /* Yeah, the max width is hard-coded 2048. */ #define MAX_WIDTH 2048 #define VIDEO_CAPS \ "video/x-raw, " \ "format = (string) { I420, Y444, Y42B }, " \ "width = [1, 2048], " \ "height = " GST_VIDEO_SIZE_RANGE ", " \ "framerate = " GST_VIDEO_FPS_RANGE static GstStaticPadTemplate gst_comb_detect_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (VIDEO_CAPS) ); static GstStaticPadTemplate gst_comb_detect_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (VIDEO_CAPS) ); /* class initialization */ G_DEFINE_TYPE_WITH_CODE (GstCombDetect, gst_comb_detect, GST_TYPE_VIDEO_FILTER, GST_DEBUG_CATEGORY_INIT (gst_comb_detect_debug_category, "combdetect", 0, "debug category for combdetect element")); static void gst_comb_detect_class_init (GstCombDetectClass * klass) { GstBaseTransformClass *base_transform_class = GST_BASE_TRANSFORM_CLASS (klass); GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass); /* Setting up pads and setting metadata should be moved to base_class_init if you intend to subclass this class. */ gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass), gst_static_pad_template_get (&gst_comb_detect_sink_template)); gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass), gst_static_pad_template_get (&gst_comb_detect_src_template)); gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass), "Comb Detect", "Video/Filter", "Detect combing artifacts in video stream", "David Schleef "); base_transform_class->transform_caps = GST_DEBUG_FUNCPTR (gst_comb_detect_transform_caps); video_filter_class->set_info = GST_DEBUG_FUNCPTR (gst_comb_detect_set_info); video_filter_class->transform_frame = GST_DEBUG_FUNCPTR (gst_comb_detect_transform_frame); } static void gst_comb_detect_init (GstCombDetect * combdetect) { } static GstCaps * gst_comb_detect_transform_caps (GstBaseTransform * trans, GstPadDirection direction, GstCaps * caps, GstCaps * filter) { GstCaps *othercaps; int i; othercaps = gst_caps_copy (caps); if (direction == GST_PAD_SRC) { GValue value = G_VALUE_INIT; GValue v = G_VALUE_INIT; g_value_init (&value, GST_TYPE_LIST); g_value_init (&v, G_TYPE_STRING); g_value_set_string (&v, "interleaved"); gst_value_list_append_value (&value, &v); g_value_set_string (&v, "mixed"); gst_value_list_append_value (&value, &v); g_value_set_string (&v, "progressive"); gst_value_list_append_value (&value, &v); for (i = 0; i < gst_caps_get_size (othercaps); i++) { GstStructure *structure = gst_caps_get_structure (othercaps, i); gst_structure_set_value (structure, "interlace-mode", &value); } g_value_reset (&value); g_value_reset (&v); } else { for (i = 0; i < gst_caps_get_size (othercaps); i++) { GstStructure *structure = gst_caps_get_structure (othercaps, i); gst_structure_set (structure, "interlace-mode", G_TYPE_STRING, "progressive", NULL); } } if (filter) { GstCaps *intersect; intersect = gst_caps_intersect (othercaps, filter); gst_caps_unref (othercaps); othercaps = intersect; } return othercaps; } static gboolean gst_comb_detect_set_info (GstVideoFilter * filter, GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info) { GstCombDetect *combdetect = GST_COMB_DETECT (filter); memcpy (&combdetect->vinfo, in_info, sizeof (GstVideoInfo)); return TRUE; } static GstFlowReturn gst_comb_detect_transform_frame (GstVideoFilter * filter, GstVideoFrame * inframe, GstVideoFrame * outframe) { static int z; int k; int height; int width; #define GET_LINE(frame,comp,line) (((unsigned char *)(frame)->data[k]) + \ (line) * GST_VIDEO_FRAME_COMP_STRIDE((frame), (comp))) z++; for (k = 1; k < 3; k++) { int i; height = GST_VIDEO_FRAME_COMP_HEIGHT (outframe, k); width = GST_VIDEO_FRAME_COMP_WIDTH (outframe, k); for (i = 0; i < height; i++) { memcpy (GET_LINE (outframe, k, i), GET_LINE (inframe, k, i), width); } } { int j; int thisline[MAX_WIDTH]; int score = 0; height = GST_VIDEO_FRAME_COMP_HEIGHT (outframe, 0); width = GST_VIDEO_FRAME_COMP_WIDTH (outframe, 0); memset (thisline, 0, sizeof (thisline)); k = 0; for (j = 0; j < height; j++) { int i; if (j < 2 || j >= height - 2) { guint8 *dest = GET_LINE (outframe, 0, j); guint8 *src = GET_LINE (inframe, 0, j); for (i = 0; i < width; i++) { dest[i] = src[i] / 2; } } else { guint8 *dest = GET_LINE (outframe, 0, j); guint8 *src1 = GET_LINE (inframe, 0, j - 1); guint8 *src2 = GET_LINE (inframe, 0, j); guint8 *src3 = GET_LINE (inframe, 0, j + 1); for (i = 0; i < width; i++) { if (src2[i] < MIN (src1[i], src3[i]) - 5 || src2[i] > MAX (src1[i], src3[i]) + 5) { if (i > 0) { thisline[i] += thisline[i - 1]; } thisline[i]++; if (thisline[i] > 1000) thisline[i] = 1000; } else { thisline[i] = 0; } if (thisline[i] > 100) { dest[i] = ((i + j + z) & 0x4) ? 235 : 16; score++; } else { dest[i] = src2[i]; } } } } if (score > 10) GST_DEBUG ("score %d", score); } return GST_FLOW_OK; }