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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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Hopefully that'll make hotdoc pick up the docs for these elements. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1428>
265 lines
7.4 KiB
C
265 lines
7.4 KiB
C
/* GStreamer
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* Copyright (C) 2013 Rdio, Inc. <ingestions@rdio.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-combdetect
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* @title: gstcombdetect
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*
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* The combdetect element detects if combing artifacts are present in
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* a raw video stream, and if so, marks them with a zebra stripe
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* pattern.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v filesrc location=file.mov ! decodebin ! combdetect !
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* xvimagesink
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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 "gstcombdetect.h"
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (gst_comb_detect_debug_category);
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#define GST_CAT_DEFAULT gst_comb_detect_debug_category
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/* prototypes */
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static GstCaps *gst_comb_detect_transform_caps (GstBaseTransform * trans,
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GstPadDirection direction, GstCaps * caps, GstCaps * filter);
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static gboolean gst_comb_detect_set_info (GstVideoFilter * filter,
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GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
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GstVideoInfo * out_info);
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static GstFlowReturn gst_comb_detect_transform_frame (GstVideoFilter * filter,
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GstVideoFrame * inframe, GstVideoFrame * outframe);
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enum
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{
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PROP_0
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};
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/* pad templates */
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/* Yeah, the max width is hard-coded 2048. */
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#define MAX_WIDTH 2048
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#define VIDEO_CAPS \
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"video/x-raw, " \
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"format = (string) { I420, Y444, Y42B }, " \
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"width = [1, 2048], " \
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"height = " GST_VIDEO_SIZE_RANGE ", " \
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"framerate = " GST_VIDEO_FPS_RANGE
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static GstStaticPadTemplate gst_comb_detect_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 (VIDEO_CAPS)
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);
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static GstStaticPadTemplate gst_comb_detect_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 (VIDEO_CAPS)
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);
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/* class initialization */
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G_DEFINE_TYPE_WITH_CODE (GstCombDetect, gst_comb_detect, GST_TYPE_VIDEO_FILTER,
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GST_DEBUG_CATEGORY_INIT (gst_comb_detect_debug_category, "combdetect", 0,
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"debug category for combdetect element"));
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static void
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gst_comb_detect_class_init (GstCombDetectClass * klass)
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{
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GstBaseTransformClass *base_transform_class =
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GST_BASE_TRANSFORM_CLASS (klass);
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GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);
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/* Setting up pads and setting metadata should be moved to
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base_class_init if you intend to subclass this class. */
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gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
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&gst_comb_detect_sink_template);
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gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
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&gst_comb_detect_src_template);
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gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
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"Comb Detect", "Video/Filter", "Detect combing artifacts in video stream",
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"David Schleef <ds@schleef.org>");
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base_transform_class->transform_caps =
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GST_DEBUG_FUNCPTR (gst_comb_detect_transform_caps);
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video_filter_class->set_info = GST_DEBUG_FUNCPTR (gst_comb_detect_set_info);
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video_filter_class->transform_frame =
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GST_DEBUG_FUNCPTR (gst_comb_detect_transform_frame);
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}
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static void
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gst_comb_detect_init (GstCombDetect * combdetect)
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{
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}
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static GstCaps *
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gst_comb_detect_transform_caps (GstBaseTransform * trans,
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GstPadDirection direction, GstCaps * caps, GstCaps * filter)
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{
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GstCaps *othercaps;
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int i;
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othercaps = gst_caps_copy (caps);
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if (direction == GST_PAD_SRC) {
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GValue value = G_VALUE_INIT;
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GValue v = G_VALUE_INIT;
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g_value_init (&value, GST_TYPE_LIST);
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g_value_init (&v, G_TYPE_STRING);
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g_value_set_string (&v, "interleaved");
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gst_value_list_append_value (&value, &v);
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g_value_set_string (&v, "mixed");
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gst_value_list_append_value (&value, &v);
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g_value_set_string (&v, "progressive");
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gst_value_list_append_value (&value, &v);
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for (i = 0; i < gst_caps_get_size (othercaps); i++) {
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GstStructure *structure = gst_caps_get_structure (othercaps, i);
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gst_structure_set_value (structure, "interlace-mode", &value);
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}
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g_value_unset (&value);
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g_value_unset (&v);
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} else {
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for (i = 0; i < gst_caps_get_size (othercaps); i++) {
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GstStructure *structure = gst_caps_get_structure (othercaps, i);
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gst_structure_set (structure, "interlace-mode", G_TYPE_STRING,
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"progressive", NULL);
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}
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}
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if (filter) {
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GstCaps *intersect;
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intersect = gst_caps_intersect (othercaps, filter);
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gst_caps_unref (othercaps);
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othercaps = intersect;
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}
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return othercaps;
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}
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static gboolean
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gst_comb_detect_set_info (GstVideoFilter * filter,
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GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
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GstVideoInfo * out_info)
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{
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GstCombDetect *combdetect = GST_COMB_DETECT (filter);
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memcpy (&combdetect->vinfo, in_info, sizeof (GstVideoInfo));
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return TRUE;
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}
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static GstFlowReturn
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gst_comb_detect_transform_frame (GstVideoFilter * filter,
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GstVideoFrame * inframe, GstVideoFrame * outframe)
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{
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static int z;
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int k;
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int height;
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int width;
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#define GET_LINE(frame,comp,line) (((unsigned char *)(frame)->data[k]) + \
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(line) * GST_VIDEO_FRAME_COMP_STRIDE((frame), (comp)))
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z++;
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for (k = 1; k < 3; k++) {
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int i;
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height = GST_VIDEO_FRAME_COMP_HEIGHT (outframe, k);
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width = GST_VIDEO_FRAME_COMP_WIDTH (outframe, k);
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for (i = 0; i < height; i++) {
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memcpy (GET_LINE (outframe, k, i), GET_LINE (inframe, k, i), width);
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}
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}
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{
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int j;
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int thisline[MAX_WIDTH];
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int score = 0;
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height = GST_VIDEO_FRAME_COMP_HEIGHT (outframe, 0);
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width = GST_VIDEO_FRAME_COMP_WIDTH (outframe, 0);
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memset (thisline, 0, sizeof (thisline));
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k = 0;
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for (j = 0; j < height; j++) {
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int i;
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if (j < 2 || j >= height - 2) {
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guint8 *dest = GET_LINE (outframe, 0, j);
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guint8 *src = GET_LINE (inframe, 0, j);
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for (i = 0; i < width; i++) {
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dest[i] = src[i] / 2;
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}
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} else {
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guint8 *dest = GET_LINE (outframe, 0, j);
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guint8 *src1 = GET_LINE (inframe, 0, j - 1);
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guint8 *src2 = GET_LINE (inframe, 0, j);
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guint8 *src3 = GET_LINE (inframe, 0, j + 1);
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for (i = 0; i < width; i++) {
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if (src2[i] < MIN (src1[i], src3[i]) - 5 ||
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src2[i] > MAX (src1[i], src3[i]) + 5) {
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if (i > 0) {
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thisline[i] += thisline[i - 1];
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}
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thisline[i]++;
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if (thisline[i] > 1000)
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thisline[i] = 1000;
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} else {
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thisline[i] = 0;
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}
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if (thisline[i] > 100) {
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dest[i] = ((i + j + z) & 0x4) ? 235 : 16;
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score++;
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} else {
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dest[i] = src2[i];
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}
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}
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}
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}
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if (score > 10)
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GST_DEBUG ("score %d", score);
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}
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return GST_FLOW_OK;
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}
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