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229 lines
6.5 KiB
C
229 lines
6.5 KiB
C
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/* GStreamer
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* (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "gstautovideosink.h"
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#include "gstautodetect.h"
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static void gst_auto_video_sink_base_init (GstAutoVideoSinkClass * klass);
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static void gst_auto_video_sink_class_init (GstAutoVideoSinkClass * klass);
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static void gst_auto_video_sink_init (GstAutoVideoSink * sink);
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static void gst_auto_video_sink_detect (GstAutoVideoSink * sink, gboolean fake);
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static GstElementStateReturn
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gst_auto_video_sink_change_state (GstElement * element);
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static GstBinClass *parent_class = NULL;
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GType
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gst_auto_video_sink_get_type (void)
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{
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static GType gst_auto_video_sink_type = 0;
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if (!gst_auto_video_sink_type) {
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static const GTypeInfo gst_auto_video_sink_info = {
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sizeof (GstAutoVideoSinkClass),
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(GBaseInitFunc) gst_auto_video_sink_base_init,
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NULL,
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(GClassInitFunc) gst_auto_video_sink_class_init,
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NULL,
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NULL,
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sizeof (GstAutoVideoSink),
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0,
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(GInstanceInitFunc) gst_auto_video_sink_init,
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};
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gst_auto_video_sink_type = g_type_register_static (GST_TYPE_BIN,
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"GstAutoVideoSink", &gst_auto_video_sink_info, 0);
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}
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return gst_auto_video_sink_type;
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}
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static void
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gst_auto_video_sink_base_init (GstAutoVideoSinkClass * klass)
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{
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GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
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GstElementDetails gst_auto_video_sink_details = {
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"Auto video sink",
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"Sink/Video",
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"Video sink embedding the Auto-settings for video output",
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"Ronald Bultje <rbultje@ronald.bitfreak.net>"
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};
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GstStaticPadTemplate sink_template = 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_ANY);
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gst_element_class_add_pad_template (eklass,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_set_details (eklass, &gst_auto_video_sink_details);
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}
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static void
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gst_auto_video_sink_class_init (GstAutoVideoSinkClass * klass)
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{
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GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
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parent_class = g_type_class_ref (GST_TYPE_BIN);
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eklass->change_state = gst_auto_video_sink_change_state;
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}
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static void
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gst_auto_video_sink_init (GstAutoVideoSink * sink)
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{
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sink->pad = NULL;
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sink->kid = NULL;
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gst_auto_video_sink_detect (sink, TRUE);
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sink->init = FALSE;
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}
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static gboolean
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gst_auto_video_sink_factory_filter (GstPluginFeature * feature, gpointer data)
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{
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guint rank;
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const gchar *klass;
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/* we only care about element factories */
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if (!GST_IS_ELEMENT_FACTORY (feature))
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return FALSE;
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/* video sinks */
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klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
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if (strcmp (klass, "Sink/Video") != 0)
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return FALSE;
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/* only select elements with autoplugging rank */
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rank = gst_plugin_feature_get_rank (feature);
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if (rank < GST_RANK_MARGINAL)
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return FALSE;
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return TRUE;
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}
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static gint
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gst_auto_video_sink_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
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{
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gint diff;
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diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
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if (diff != 0)
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return diff;
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return strcmp (gst_plugin_feature_get_name (f2),
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gst_plugin_feature_get_name (f1));
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}
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static GstElement *
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gst_auto_video_sink_find_best (GstAutoVideoSink * sink)
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{
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GList *list;
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list = gst_registry_pool_feature_filter (
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(GstPluginFeatureFilter) gst_auto_video_sink_factory_filter, FALSE, sink);
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list = g_list_sort (list, (GCompareFunc) gst_auto_video_sink_compare_ranks);
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for (; list != NULL; list = list->next) {
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GstElementFactory *f = GST_ELEMENT_FACTORY (list->data);
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GstElement *el;
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if ((el = gst_element_factory_create (f, "actual-sink"))) {
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if (gst_element_set_state (el, GST_STATE_READY) == GST_STATE_SUCCESS) {
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gst_element_set_state (el, GST_STATE_NULL);
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return el;
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}
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gst_object_unref (GST_OBJECT (el));
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}
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}
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return NULL;
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}
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static void
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gst_auto_video_sink_detect (GstAutoVideoSink * sink, gboolean fake)
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{
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GstElement *esink;
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GstPad *peer = NULL;
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/* save ghostpad */
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if (sink->pad) {
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gst_object_ref (GST_OBJECT (sink->pad));
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peer = GST_PAD_PEER (GST_PAD_REALIZE (sink->pad));
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if (peer)
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gst_pad_unlink (peer, sink->pad);
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}
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/* kill old element */
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if (sink->kid) {
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GST_DEBUG_OBJECT (sink, "Removing old kid");
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gst_bin_remove (GST_BIN (sink), sink->kid);
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sink->kid = NULL;
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}
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/* find element */
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GST_DEBUG_OBJECT (sink, "Creating new kid (%ssink)", fake ? "fake" : "video");
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if (fake) {
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esink = gst_element_factory_make ("fakesink", "temporary-sink");
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g_return_if_fail (esink);
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} else if (!(esink = gst_auto_video_sink_find_best (sink))) {
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GST_ELEMENT_ERROR (sink, LIBRARY, INIT, (NULL),
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("Failed to find a supported video sink"));
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return;
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}
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sink->kid = esink;
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gst_bin_add (GST_BIN (sink), esink);
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/* attach ghost pad */
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if (sink->pad) {
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GST_DEBUG_OBJECT (sink, "Re-doing existing ghostpad");
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gst_pad_add_ghost_pad (gst_element_get_pad (sink->kid, "sink"), sink->pad);
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} else {
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GST_DEBUG_OBJECT (sink, "Creating new ghostpad");
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sink->pad = gst_ghost_pad_new ("sink",
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gst_element_get_pad (sink->kid, "sink"));
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gst_element_add_pad (GST_ELEMENT (sink), sink->pad);
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}
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if (peer) {
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GST_DEBUG_OBJECT (sink, "Linking...");
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gst_pad_link (peer, sink->pad);
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}
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GST_DEBUG_OBJECT (sink, "done changing auto video sink");
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sink->init = TRUE;
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}
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static GstElementStateReturn
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gst_auto_video_sink_change_state (GstElement * element)
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{
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GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (element);
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if (GST_STATE_TRANSITION (element) == GST_STATE_NULL_TO_READY && !sink->init) {
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gst_auto_video_sink_detect (sink, FALSE);
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if (!sink->init)
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return GST_STATE_FAILURE;
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}
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return GST_ELEMENT_CLASS (parent_class)->change_state (element);
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}
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