gstreamer/tests/examples/test1.c

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/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <bilboed@bilboed.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <ges/ges.h>
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/* A simple timeline with 3 audio/video sources */
static gboolean
fill_customsrc (GESTimelineObject * object, GESTrackObject * trobject,
GstElement * gnlobj, gpointer user_data)
{
GstElement *src;
guint var = GPOINTER_TO_UINT (user_data);
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/* Based on the Track type, we will either put a videotestsrc
* or an audiotestsrc */
if (trobject->track->type == GES_TRACK_TYPE_VIDEO) {
src = gst_element_factory_make ("videotestsrc", NULL);
g_object_set (src, "pattern", var, NULL);
} else if (trobject->track->type == GES_TRACK_TYPE_AUDIO) {
src = gst_element_factory_make ("audiotestsrc", NULL);
g_object_set (src, "freq", 440.0 * (var + 1), NULL);
} else
return FALSE;
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/* Finally we fill in the gnlobject */
return gst_bin_add (GST_BIN (gnlobj), src);
}
int
main (int argc, gchar ** argv)
{
GESTimelinePipeline *pipeline;
GESTimeline *timeline;
GESTrack *trackv, *tracka;
GESTimelineLayer *layer;
GESCustomTimelineSource *src1, *src2, *src3;
GMainLoop *mainloop;
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/* Initialize GStreamer (this will parse environment variables and commandline
* arguments. */
gst_init (&argc, &argv);
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/* Initialize the GStreamer Editing Services */
ges_init ();
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/* Setup of a A/V timeline */
/* This is our main GESTimeline */
timeline = ges_timeline_new ();
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/* We want to output both audio and video, therefore we
* grab two tracks, one for each output type. */
trackv = ges_track_video_raw_new ();
tracka = ges_track_audio_raw_new ();
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/* We are only going to be doing one layer of timeline objects */
layer = ges_timeline_layer_new ();
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/* Add the tracks and the layer to the timeline */
if (!ges_timeline_add_layer (timeline, layer))
return -1;
if (!ges_timeline_add_track (timeline, trackv))
return -1;
if (!ges_timeline_add_track (timeline, tracka))
return -1;
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/* Here we've finished initializing our timeline, we're
* ready to start using it... by solely working with the layer !*/
/* We are here creating 3 sources of 1s each which we will put one after
* the other.
*
* For our sources, and since we want to prototype quickly, we just use
* a GESCustomTimelineSource. This will use the callback we provide to
* fill in the GESTrackObject.
* */
src1 = ges_custom_timeline_source_new (fill_customsrc, GUINT_TO_POINTER (0));
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g_object_set (src1, "start", (guint64) 0, "duration", GST_SECOND, NULL);
src2 = ges_custom_timeline_source_new (fill_customsrc, GUINT_TO_POINTER (1));
g_object_set (src2, "start", GST_SECOND, "duration", GST_SECOND, NULL);
src3 = ges_custom_timeline_source_new (fill_customsrc, GUINT_TO_POINTER (0));
g_object_set (src3, "start", 2 * GST_SECOND, "duration", GST_SECOND, NULL);
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/* Add those sources to our layer */
ges_timeline_layer_add_object (layer, (GESTimelineObject *) src1);
ges_timeline_layer_add_object (layer, (GESTimelineObject *) src2);
ges_timeline_layer_add_object (layer, (GESTimelineObject *) src3);
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/* In order to view our timeline, let's grab a convenience pipeline to put
* our timeline in. */
pipeline = ges_timeline_pipeline_new ();
/* Add the timeline to that pipeline */
if (!ges_timeline_pipeline_add_timeline (pipeline, timeline))
return -1;
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/* The following is standard usage of a GStreamer pipeline (note how you haven't
* had to care about GStreamer so far ?).
*
* We set the pipeline to playing ... */
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
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/* .. and we start a GMainLoop. GES **REQUIRES** a GMainLoop to be running in
* order to function properly ! */
mainloop = g_main_loop_new (NULL, FALSE);
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/* Simple code to have the mainloop shutdown after 4s */
g_timeout_add_seconds (4, (GSourceFunc) g_main_loop_quit, mainloop);
g_main_loop_run (mainloop);
return 0;
}