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130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/* GStreamer
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* Copyright (C) 2011 Jon Nordby <jononor@gmail.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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Example showing usage of the cairooverlay element
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*/
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <cairo.h>
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#include <cairo-gobject.h>
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#include <glib.h>
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/* Datastructure to share the state we are interested in between
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* prepare and render function. */
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typedef struct
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{
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gboolean valid;
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int width;
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int height;
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} CairoOverlayState;
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/* Store the information from the caps that we are interested in. */
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static void
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prepare_overlay (GstElement * overlay, GstCaps * caps, gpointer user_data)
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{
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CairoOverlayState *state = (CairoOverlayState *) user_data;
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gst_video_format_parse_caps (caps, NULL, &state->width, &state->height);
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state->valid = TRUE;
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}
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/* Draw the overlay.
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* This function draws a cute "beating" heart. */
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static void
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draw_overlay (GstElement * overlay, cairo_t * cr, guint64 timestamp,
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guint64 duration, gpointer user_data)
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{
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CairoOverlayState *s = (CairoOverlayState *) user_data;
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double scale;
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if (!s->valid)
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return;
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scale = 2 * (((timestamp / (int) 1e7) % 70) + 30) / 100.0;
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cairo_translate (cr, s->width / 2, (s->height / 2) - 30);
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cairo_scale (cr, scale, scale);
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cairo_move_to (cr, 0, 0);
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cairo_curve_to (cr, 0, -30, -50, -30, -50, 0);
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cairo_curve_to (cr, -50, 30, 0, 35, 0, 60);
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cairo_curve_to (cr, 0, 35, 50, 30, 50, 0);
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cairo_curve_to (cr, 50, -30, 0, -30, 0, 0);
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cairo_set_source_rgba (cr, 0.9, 0.0, 0.1, 0.7);
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cairo_fill (cr);
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}
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static GstElement *
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setup_gst_pipeline (CairoOverlayState * overlay_state)
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{
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GstElement *pipeline;
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GstElement *cairo_overlay;
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GstElement *source, *adaptor1, *adaptor2, *sink;
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pipeline = gst_pipeline_new ("cairo-overlay-example");
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/* Adaptors needed because cairooverlay only supports ARGB data */
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source = gst_element_factory_make ("videotestsrc", "source");
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adaptor1 = gst_element_factory_make ("ffmpegcolorspace", "adaptor1");
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cairo_overlay = gst_element_factory_make ("cairooverlay", "overlay");
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adaptor2 = gst_element_factory_make ("ffmpegcolorspace", "adaptor2");
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sink = gst_element_factory_make ("autovideosink", "sink");
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/* If failing, the element could not be created */
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g_assert (cairo_overlay);
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/* Hook up the neccesary signals for cairooverlay */
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g_signal_connect (cairo_overlay, "draw",
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G_CALLBACK (draw_overlay), overlay_state);
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g_signal_connect (cairo_overlay, "caps-changed",
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G_CALLBACK (prepare_overlay), overlay_state);
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gst_bin_add_many (GST_BIN (pipeline), source, adaptor1,
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cairo_overlay, adaptor2, sink, NULL);
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if (!gst_element_link_many (source, adaptor1,
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cairo_overlay, adaptor2, sink, NULL)) {
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g_warning ("Failed to link elements!");
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}
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return pipeline;
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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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GMainLoop *loop;
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GstElement *pipeline;
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CairoOverlayState *overlay_state;
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gst_init (&argc, &argv);
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loop = g_main_loop_new (NULL, FALSE);
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overlay_state = g_new0 (CairoOverlayState, 1);
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pipeline = setup_gst_pipeline (overlay_state);
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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g_main_loop_run (loop);
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gst_object_unref (pipeline);
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g_free (overlay_state);
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}
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