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examples: Add a compositor mosaic example.
Add an example of configuring compositor to display 2 videos side-by-side in a mosaic, and additionally configure some video-converter properties to demonstrate how that works.. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/919>
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/* | ||
* GStreamer | ||
* Copyright (C) 2017 Thibault Saunier <thibault.saunier@osg-samsung.com> | ||
* Copyright (C) 2020 Jan Schmidt <jan@centricular.com> | ||
* | ||
* 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 St, Fifth Floor, | ||
* Boston, MA 02110-1301, USA. | ||
*/ | ||
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/** | ||
* Simple example using the compositor element. | ||
* | ||
* Takes two video files and display them side-by-side as a mosaic | ||
*/ | ||
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#include <stdlib.h> | ||
#include <gst/gst.h> | ||
#include <gst/video/video.h> | ||
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typedef struct | ||
{ | ||
GstElement *compositor; | ||
gint x, y, w, h; | ||
gint zorder; | ||
} VideoInfo; | ||
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static gchar * | ||
ensure_uri (const gchar * location) | ||
{ | ||
if (gst_uri_is_valid (location)) | ||
return g_strdup (location); | ||
else | ||
return gst_filename_to_uri (location, NULL); | ||
} | ||
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static void | ||
_pad_added_cb (GstElement * decodebin, GstPad * pad, VideoInfo * info) | ||
{ | ||
GstStructure *converter_config; | ||
GstPad *sinkpad = | ||
gst_element_get_request_pad (GST_ELEMENT (info->compositor), "sink_%u"); | ||
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converter_config = gst_structure_new ("GstVideoConverter", | ||
GST_VIDEO_CONVERTER_OPT_THREADS, G_TYPE_UINT, 0, | ||
GST_VIDEO_CONVERTER_OPT_RESAMPLER_METHOD, GST_TYPE_VIDEO_RESAMPLER_METHOD, | ||
GST_VIDEO_RESAMPLER_METHOD_NEAREST, GST_VIDEO_CONVERTER_OPT_DEST_X, | ||
G_TYPE_INT, 0, GST_VIDEO_CONVERTER_OPT_DEST_Y, G_TYPE_INT, 0, | ||
GST_VIDEO_CONVERTER_OPT_DEST_WIDTH, G_TYPE_INT, info->w, | ||
GST_VIDEO_CONVERTER_OPT_DEST_HEIGHT, G_TYPE_INT, info->h, NULL); | ||
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g_object_set (sinkpad, "xpos", info->x, "ypos", info->y, "width", info->w, | ||
"height", info->h, "converter-config", converter_config, NULL); | ||
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gst_structure_free (converter_config); | ||
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gst_pad_link (pad, sinkpad); | ||
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g_free (info); | ||
} | ||
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int | ||
main (int argc, char *argv[]) | ||
{ | ||
gint i; | ||
GstMessage *message; | ||
GstElement *compositor, *pipeline; | ||
GstBus *bus; | ||
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if (argc != 3) { | ||
g_error ("Need to provide 2 input videos"); | ||
return -1; | ||
} | ||
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gst_init (&argc, &argv); | ||
pipeline = | ||
gst_parse_launch | ||
("videotestsrc pattern=black is-live=true ! video/x-raw,width=1,height=1,format=AYUV ! compositor name=comp start-time-selection=first ! video/x-raw,format=AYUV,width=1275,height=833,framerate=25/1 ! videoconvert ! autovideosink", | ||
NULL); | ||
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g_assert (pipeline != NULL); | ||
compositor = gst_bin_get_by_name (GST_BIN (pipeline), "comp"); | ||
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gst_util_set_object_arg (G_OBJECT (compositor), "background", "black"); | ||
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for (i = 1; i < 3; i++) { | ||
gchar *uri = ensure_uri (argv[i]); | ||
VideoInfo *info = g_malloc0 (sizeof (VideoInfo)); | ||
GstElement *uridecodebin = gst_element_factory_make ("uridecodebin", NULL); | ||
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g_object_set (uridecodebin, "uri", uri, "expose-all-streams", FALSE, | ||
"caps", gst_caps_from_string ("video/x-raw(ANY)"), NULL); | ||
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info->compositor = compositor; | ||
if (i == 1) { | ||
info->x = 326; | ||
info->y = 155; | ||
info->w = 930; | ||
info->h = 523; | ||
info->zorder = 2; | ||
} else { | ||
info->x = 19; | ||
info->y = 155; | ||
info->w = 288; | ||
info->h = 162; | ||
info->zorder = 3; | ||
} | ||
g_signal_connect (uridecodebin, "pad-added", (GCallback) _pad_added_cb, | ||
info); | ||
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gst_bin_add (GST_BIN (pipeline), uridecodebin); | ||
} | ||
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bus = gst_element_get_bus (pipeline); | ||
gst_element_set_state (pipeline, GST_STATE_PLAYING); | ||
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message = | ||
gst_bus_timed_pop_filtered (bus, 60 * GST_SECOND, | ||
GST_MESSAGE_EOS | GST_MESSAGE_ERROR); | ||
GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS (GST_BIN (pipeline), | ||
GST_DEBUG_GRAPH_SHOW_ALL | GST_DEBUG_GRAPH_SHOW_VERBOSE, "go"); | ||
if (message) | ||
gst_print ("%" GST_PTR_FORMAT "\n", message); | ||
else | ||
gst_print ("Timeout\n"); | ||
gst_element_set_state (pipeline, GST_STATE_NULL); | ||
gst_object_unref (pipeline); | ||
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return 0; | ||
} |