mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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55d2754098
Replaced with "GStreamer maintainers <gstreamer-devel@lists.sourceforge.net>" or just removed, depending on the number of other authors.
441 lines
13 KiB
C
441 lines
13 KiB
C
/* GStreamer
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* (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* (c) 2006 Jan Schmidt <thaytan@noraisin.net>
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* (c) 2008 Stefan Kost <ensonic@users.sf.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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/**
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* SECTION:element-autovideosrc
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* @see_also: autoaudiosrc, v4l2src, v4lsrc
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*
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* autovideosrc is a video src that automatically detects an appropriate
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* video source to use. It does so by scanning the registry for all elements
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* that have <quote>Source</quote> and <quote>Video</quote> in the class field
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* of their element information, and also have a non-zero autoplugging rank.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch -v -m autovideosrc ! xvimagesink
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* ]|
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* </refsect2>
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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 "gstautovideosrc.h"
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#include "gstautodetect.h"
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/* Properties */
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enum
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{
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PROP_0,
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PROP_CAPS,
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};
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static GstStateChangeReturn
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gst_auto_video_src_change_state (GstElement * element,
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GstStateChange transition);
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static void gst_auto_video_src_dispose (GstAutoVideoSrc * src);
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static void gst_auto_video_src_clear_kid (GstAutoVideoSrc * src);
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static void gst_auto_video_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_auto_video_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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GST_BOILERPLATE (GstAutoVideoSrc, gst_auto_video_src, GstBin, GST_TYPE_BIN);
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static const GstElementDetails gst_auto_video_src_details =
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GST_ELEMENT_DETAILS ("Auto video source",
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"Source/Video",
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"Wrapper video source for automatically detected video source",
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"Jan Schmidt <thaytan@noraisin.net>\n"
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"Stefan Kost <ensonic@users.sf.net>");
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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static void
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gst_auto_video_src_base_init (gpointer klass)
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{
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GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (eklass,
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gst_static_pad_template_get (&src_template));
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gst_element_class_set_details (eklass, &gst_auto_video_src_details);
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}
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static void
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gst_auto_video_src_class_init (GstAutoVideoSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
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gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->dispose =
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(GObjectFinalizeFunc) GST_DEBUG_FUNCPTR (gst_auto_video_src_dispose);
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eklass->change_state = GST_DEBUG_FUNCPTR (gst_auto_video_src_change_state);
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gobject_class->set_property =
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GST_DEBUG_FUNCPTR (gst_auto_video_src_set_property);
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gobject_class->get_property =
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GST_DEBUG_FUNCPTR (gst_auto_video_src_get_property);
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/**
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* GstAutoVideoSrc:filter-caps
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*
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* This property will filter out candidate sources that can handle the specified
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* caps. By default only video sources that support raw rgb and yuv video
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* are selected.
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*
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* This property can only be set before the element goes to the READY state.
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*
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* Since: 0.10.14
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**/
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g_object_class_install_property (gobject_class, PROP_CAPS,
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g_param_spec_boxed ("filter-caps", "Filter caps",
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"Filter src candidates using these caps.", GST_TYPE_CAPS,
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G_PARAM_READWRITE));
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}
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static void
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gst_auto_video_src_dispose (GstAutoVideoSrc * src)
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{
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gst_auto_video_src_clear_kid (src);
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if (src->filter_caps)
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gst_caps_unref (src->filter_caps);
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src->filter_caps = NULL;
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G_OBJECT_CLASS (parent_class)->dispose ((GObject *) src);
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}
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static void
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gst_auto_video_src_clear_kid (GstAutoVideoSrc * src)
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{
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if (src->kid) {
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gst_element_set_state (src->kid, GST_STATE_NULL);
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gst_bin_remove (GST_BIN (src), src->kid);
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src->kid = NULL;
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}
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}
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/*
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* Hack to make initial linking work; ideally, this'd work even when
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* no target has been assigned to the ghostpad yet.
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*/
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static void
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gst_auto_video_src_reset (GstAutoVideoSrc * src)
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{
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GstPad *targetpad;
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/* Remove any existing element */
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gst_auto_video_src_clear_kid (src);
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/* fakesrc placeholder */
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src->kid = gst_element_factory_make ("fakesrc", "tempsrc");
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gst_bin_add (GST_BIN (src), src->kid);
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/* pad */
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targetpad = gst_element_get_static_pad (src->kid, "src");
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gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad);
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gst_object_unref (targetpad);
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}
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static GstStaticCaps raw_caps =
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GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb");
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static void
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gst_auto_video_src_init (GstAutoVideoSrc * src, GstAutoVideoSrcClass * g_class)
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{
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src->pad = gst_ghost_pad_new_no_target ("src", GST_PAD_SRC);
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gst_element_add_pad (GST_ELEMENT (src), src->pad);
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gst_auto_video_src_reset (src);
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/* set the default raw video caps */
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src->filter_caps = gst_static_caps_get (&raw_caps);
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/* mark as source */
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GST_OBJECT_FLAG_UNSET (src, GST_ELEMENT_IS_SINK);
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}
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static gboolean
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gst_auto_video_src_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 sources */
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klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
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if (!(strstr (klass, "Source") && strstr (klass, "Video")))
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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_src_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_src_create_element_with_pretty_name (GstAutoVideoSrc * src,
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GstElementFactory * factory)
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{
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GstElement *element;
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gchar *name, *marker;
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marker = g_strdup (GST_PLUGIN_FEATURE (factory)->name);
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if (g_str_has_suffix (marker, "src"))
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marker[strlen (marker) - 4] = '\0';
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if (g_str_has_prefix (marker, "gst"))
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g_memmove (marker, marker + 3, strlen (marker + 3) + 1);
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name = g_strdup_printf ("%s-actual-src-%s", GST_OBJECT_NAME (src), marker);
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g_free (marker);
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element = gst_element_factory_create (factory, name);
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g_free (name);
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return element;
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}
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static GstElement *
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gst_auto_video_src_find_best (GstAutoVideoSrc * src)
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{
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GList *list, *item;
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GstElement *choice = NULL;
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GstMessage *message = NULL;
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GSList *errors = NULL;
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GstBus *bus = gst_bus_new ();
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GstPad *el_pad = NULL;
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GstCaps *el_caps = NULL, *intersect = NULL;
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gboolean no_match = TRUE;
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list = gst_registry_feature_filter (gst_registry_get_default (),
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(GstPluginFeatureFilter) gst_auto_video_src_factory_filter, FALSE, src);
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list = g_list_sort (list, (GCompareFunc) gst_auto_video_src_compare_ranks);
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GST_LOG_OBJECT (src, "Trying to find usable video devices ...");
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for (item = list; item != NULL; item = item->next) {
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GstElementFactory *f = GST_ELEMENT_FACTORY (item->data);
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GstElement *el;
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if ((el = gst_auto_video_src_create_element_with_pretty_name (src, f))) {
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GstStateChangeReturn ret;
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GST_DEBUG_OBJECT (src, "Testing %s", GST_PLUGIN_FEATURE (f)->name);
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/* If AutoVideoSrc has been provided with filter caps,
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* accept only sources that match with the filter caps */
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if (src->filter_caps) {
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el_pad = gst_element_get_static_pad (GST_ELEMENT (el), "src");
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el_caps = gst_pad_get_caps (el_pad);
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gst_object_unref (el_pad);
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GST_DEBUG_OBJECT (src,
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"Checking caps: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT,
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src->filter_caps, el_caps);
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intersect = gst_caps_intersect (src->filter_caps, el_caps);
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no_match = gst_caps_is_empty (intersect);
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gst_caps_unref (el_caps);
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gst_caps_unref (intersect);
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if (no_match) {
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GST_DEBUG_OBJECT (src, "Incompatible caps");
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gst_object_unref (el);
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continue;
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} else {
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GST_DEBUG_OBJECT (src, "Found compatible caps");
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}
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}
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gst_element_set_bus (el, bus);
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ret = gst_element_set_state (el, GST_STATE_READY);
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if (ret == GST_STATE_CHANGE_SUCCESS) {
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GST_DEBUG_OBJECT (src, "This worked!");
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choice = el;
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break;
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}
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/* collect all error messages */
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while ((message = gst_bus_pop_filtered (bus, GST_MESSAGE_ERROR))) {
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GST_DEBUG_OBJECT (src, "error message %" GST_PTR_FORMAT, message);
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errors = g_slist_append (errors, message);
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}
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gst_element_set_state (el, GST_STATE_NULL);
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gst_object_unref (el);
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}
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}
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GST_DEBUG_OBJECT (src, "done trying");
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if (!choice) {
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if (errors) {
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/* FIXME: we forward the first error for now; but later on it might make
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* sense to actually analyse them */
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gst_message_ref (GST_MESSAGE (errors->data));
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GST_DEBUG_OBJECT (src, "reposting message %p", errors->data);
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gst_element_post_message (GST_ELEMENT (src), GST_MESSAGE (errors->data));
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} else {
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/* send warning message to application and use a fakesrc */
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GST_ELEMENT_WARNING (src, RESOURCE, NOT_FOUND, (NULL),
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("Failed to find a usable video source"));
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choice = gst_element_factory_make ("fakesrc", "fake-video-src");
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if (g_object_class_find_property (G_OBJECT_GET_CLASS (choice), "sync"))
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g_object_set (choice, "sync", TRUE, NULL);
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gst_element_set_state (choice, GST_STATE_READY);
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}
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}
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gst_object_unref (bus);
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gst_plugin_feature_list_free (list);
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g_slist_foreach (errors, (GFunc) gst_mini_object_unref, NULL);
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g_slist_free (errors);
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return choice;
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}
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static gboolean
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gst_auto_video_src_detect (GstAutoVideoSrc * src)
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{
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GstElement *esrc;
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GstPad *targetpad;
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gst_auto_video_src_clear_kid (src);
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/* find element */
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GST_DEBUG_OBJECT (src, "Creating new kid");
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if (!(esrc = gst_auto_video_src_find_best (src)))
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goto no_src;
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src->kid = esrc;
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gst_bin_add (GST_BIN (src), esrc);
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/* attach ghost pad */
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GST_DEBUG_OBJECT (src, "Re-assigning ghostpad");
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targetpad = gst_element_get_static_pad (src->kid, "src");
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if (!gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad))
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goto target_failed;
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gst_object_unref (targetpad);
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GST_DEBUG_OBJECT (src, "done changing auto video source");
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return TRUE;
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/* ERRORS */
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no_src:
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{
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GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL),
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("Failed to find a supported video source"));
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return FALSE;
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}
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target_failed:
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{
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GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL),
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("Failed to set target pad"));
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gst_object_unref (targetpad);
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return FALSE;
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}
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}
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static GstStateChangeReturn
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gst_auto_video_src_change_state (GstElement * element,
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GstStateChange transition)
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{
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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if (!gst_auto_video_src_detect (src))
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return GST_STATE_CHANGE_FAILURE;
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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gst_auto_video_src_reset (src);
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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gst_auto_video_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (object);
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switch (prop_id) {
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case PROP_CAPS:
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if (src->filter_caps)
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gst_caps_unref (src->filter_caps);
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src->filter_caps = gst_caps_copy (gst_value_get_caps (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_auto_video_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (object);
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switch (prop_id) {
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case PROP_CAPS:{
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gst_value_set_caps (value, src->filter_caps);
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break;
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}
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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