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e87fa73e60
This removes the crossfade-ratio property and replaces it with an operator property. Currently this implements the following operators: - SOURCE: Copy over the source and don't look at the destination - OVER: Default blending of the source over the destination - ADD: Like OVER but simply adding the alpha instead See the example for how to implement crossfading with this. https://bugzilla.gnome.org/show_bug.cgi?id=797169
134 lines
4 KiB
C
134 lines
4 KiB
C
/*
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* GStreamer
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* Copyright (C) 2017 Thibault Saunier <thibault.saunier@osg-samsung.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 St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* Simple crossfade example using the compositor element.
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*
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* Takes two video files and crossfades them for 10 seconds and returns.
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*/
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#include <stdlib.h>
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#include <gst/gst.h>
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#include <gst/controller/gstdirectcontrolbinding.h>
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#include <gst/controller/gstinterpolationcontrolsource.h>
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typedef struct
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{
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GstElement *compositor;
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guint z_order;
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} VideoInfo;
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static gchar *
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ensure_uri (const gchar * location)
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{
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if (gst_uri_is_valid (location))
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return g_strdup (location);
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else
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return gst_filename_to_uri (location, NULL);
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}
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static void
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_pad_added_cb (GstElement * decodebin, GstPad * pad, VideoInfo * info)
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{
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GstPad *sinkpad =
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gst_element_get_request_pad (GST_ELEMENT (info->compositor), "sink_%u");
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GstControlSource *control_source;
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gboolean is_last = info->z_order == 1;
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control_source = gst_interpolation_control_source_new ();
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gst_util_set_object_arg (G_OBJECT (sinkpad), "operator",
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info->z_order == 0 ? "source" : "add");
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gst_object_add_control_binding (GST_OBJECT (sinkpad),
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gst_direct_control_binding_new_absolute (GST_OBJECT (sinkpad), "alpha",
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control_source));
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g_object_set (control_source, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
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gst_timed_value_control_source_set (GST_TIMED_VALUE_CONTROL_SOURCE
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(control_source), 0, is_last ? 0.0 : 1.0);
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gst_timed_value_control_source_set (GST_TIMED_VALUE_CONTROL_SOURCE
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(control_source), 10 * GST_SECOND, is_last ? 1.0 : 0.0);
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g_object_set (sinkpad, "zorder", info->z_order, NULL);
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gst_pad_link (pad, sinkpad);
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g_free (info);
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}
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int
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main (int argc, char *argv[])
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{
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gint i;
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GstMessage *message;
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GstElement *compositor, *sink, *pipeline;
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GstBus *bus;
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if (argc != 3) {
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g_error ("Need to provide 2 input videos");
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return -1;
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}
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gst_init (&argc, &argv);
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pipeline = gst_element_factory_make ("pipeline", NULL);
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compositor = gst_element_factory_make ("compositor", NULL);
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sink =
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gst_parse_bin_from_description ("videoconvert ! autovideosink", TRUE,
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NULL);
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gst_util_set_object_arg (G_OBJECT (compositor), "background", "black");
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gst_bin_add_many (GST_BIN (pipeline), compositor, sink, NULL);
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g_assert (gst_element_link (compositor, sink));
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for (i = 1; i < 3; i++) {
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gchar *uri = ensure_uri (argv[i]);
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VideoInfo *info = g_malloc0 (sizeof (VideoInfo));
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GstElement *uridecodebin = gst_element_factory_make ("uridecodebin", NULL);
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g_object_set (uridecodebin, "uri", uri, "expose-all-streams", FALSE,
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"caps", gst_caps_from_string ("video/x-raw(ANY)"), NULL);
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info->compositor = compositor;
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info->z_order = i - 1;
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g_signal_connect (uridecodebin, "pad-added", (GCallback) _pad_added_cb,
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info);
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gst_bin_add (GST_BIN (pipeline), uridecodebin);
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}
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bus = gst_element_get_bus (pipeline);
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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message =
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gst_bus_timed_pop_filtered (bus, 11 * GST_SECOND,
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GST_MESSAGE_EOS | GST_MESSAGE_ERROR);
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GST_DEBUG_BIN_TO_DOT_FILE_WITH_TS (GST_BIN (pipeline),
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GST_DEBUG_GRAPH_SHOW_ALL, "go");
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if (message)
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gst_print ("%" GST_PTR_FORMAT "\n", message);
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else
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gst_print ("Timeout\n");
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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return 0;
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}
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