1 /* GStreamer |
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2 * (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net> |
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3 * (c) 2006 Jan Schmidt <thaytan@noraisin.net> |
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4 * |
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5 * This library is free software; you can redistribute it and/or |
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6 * modify it under the terms of the GNU Library General Public |
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7 * License as published by the Free Software Foundation; either |
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8 * version 2 of the License, or (at your option) any later version. |
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9 * |
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10 * This library is distributed in the hope that it will be useful, |
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 * Library General Public License for more details. |
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14 * |
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15 * You should have received a copy of the GNU Library General Public |
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16 * License along with this library; if not, write to the |
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17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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18 * Boston, MA 02111-1307, USA. |
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19 */ |
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20 |
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21 /** |
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22 * SECTION:element-autovideosink |
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23 * @see_also: autoaudiosink, ximagesink, xvimagesink, sdlvideosink |
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24 * |
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25 * <refsect2> |
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26 * <para> |
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27 * autovideosink is a video sink that automatically detects an appropriate |
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28 * video sink to use. It does so by scanning the registry for all elements |
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29 * that have <quote>Sink</quote> and <quote>Video</quote> in the class field |
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30 * of their element information, and also have a non-zero autoplugging rank. |
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31 * </para> |
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32 * <title>Example launch line</title> |
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33 * <para> |
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34 * <programlisting> |
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35 * gst-launch -v -m videotestsrc ! autovideosink |
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36 * </programlisting> |
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37 * </para> |
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38 * </refsect2> |
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39 */ |
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40 |
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41 #ifdef HAVE_CONFIG_H |
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42 #include "config.h" |
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43 #endif |
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44 |
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45 #include <string.h> |
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46 |
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47 #include "gstautovideosink.h" |
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48 #include "gstautodetect.h" |
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49 |
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50 /* Properties */ |
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51 enum |
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52 { |
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53 PROP_0, |
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54 PROP_CAPS, |
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55 }; |
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56 |
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57 static GstStateChangeReturn |
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58 gst_auto_video_sink_change_state (GstElement * element, |
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59 GstStateChange transition); |
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60 static void gst_auto_video_sink_dispose (GstAutoVideoSink * sink); |
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61 static void gst_auto_video_sink_clear_kid (GstAutoVideoSink * sink); |
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62 |
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63 static void gst_auto_video_sink_set_property (GObject * object, guint prop_id, |
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64 const GValue * value, GParamSpec * pspec); |
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65 static void gst_auto_video_sink_get_property (GObject * object, guint prop_id, |
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66 GValue * value, GParamSpec * pspec); |
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67 |
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68 GST_BOILERPLATE (GstAutoVideoSink, gst_auto_video_sink, GstBin, GST_TYPE_BIN); |
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69 |
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70 static const GstElementDetails gst_auto_video_sink_details = |
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71 GST_ELEMENT_DETAILS ("Auto video sink", |
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72 "Sink/Video", |
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73 "Wrapper video sink for automatically detected video sink", |
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74 "Ronald Bultje <rbultje@ronald.bitfreak.net>\n" |
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75 "Jan Schmidt <thaytan@noraisin.net"); |
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76 |
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77 static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", |
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78 GST_PAD_SINK, |
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79 GST_PAD_ALWAYS, |
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80 GST_STATIC_CAPS_ANY); |
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81 |
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82 static void |
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83 gst_auto_video_sink_base_init (gpointer klass) |
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84 { |
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85 GstElementClass *eklass = GST_ELEMENT_CLASS (klass); |
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86 |
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87 gst_element_class_add_pad_template (eklass, |
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88 gst_static_pad_template_get (&sink_template)); |
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89 gst_element_class_set_details (eklass, &gst_auto_video_sink_details); |
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90 } |
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91 |
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92 static void |
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93 gst_auto_video_sink_class_init (GstAutoVideoSinkClass * klass) |
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94 { |
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95 GObjectClass *gobject_class; |
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96 GstElementClass *eklass = GST_ELEMENT_CLASS (klass); |
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97 |
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98 gobject_class = G_OBJECT_CLASS (klass); |
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99 gobject_class->dispose = |
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100 (GObjectFinalizeFunc) GST_DEBUG_FUNCPTR (gst_auto_video_sink_dispose); |
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101 eklass->change_state = GST_DEBUG_FUNCPTR (gst_auto_video_sink_change_state); |
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102 gobject_class->set_property = |
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103 GST_DEBUG_FUNCPTR (gst_auto_video_sink_set_property); |
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104 gobject_class->get_property = |
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105 GST_DEBUG_FUNCPTR (gst_auto_video_sink_get_property); |
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106 |
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107 /** |
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108 * GstAutoVideoSink:filter-caps |
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109 * |
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110 * This property will filter out candidate sinks that can handle the specified |
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111 * caps. By default only video sinks that support raw rgb and yuv video |
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112 * are selected. |
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113 * |
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114 * This property can only be set before the element goes to the READY state. |
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115 * |
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116 * Since: 0.10.7 |
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117 **/ |
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118 g_object_class_install_property (gobject_class, PROP_CAPS, |
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119 g_param_spec_boxed ("filter-caps", "Filter caps", |
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120 "Filter sink candidates using these caps.", GST_TYPE_CAPS, |
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121 G_PARAM_READWRITE)); |
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122 } |
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123 |
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124 static void |
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125 gst_auto_video_sink_dispose (GstAutoVideoSink * sink) |
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126 { |
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127 gst_auto_video_sink_clear_kid (sink); |
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128 |
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129 if (sink->filter_caps) |
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130 gst_caps_unref (sink->filter_caps); |
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131 sink->filter_caps = NULL; |
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132 |
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133 G_OBJECT_CLASS (parent_class)->dispose ((GObject *) sink); |
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134 } |
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135 |
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136 static void |
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137 gst_auto_video_sink_clear_kid (GstAutoVideoSink * sink) |
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138 { |
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139 if (sink->kid) { |
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140 gst_element_set_state (sink->kid, GST_STATE_NULL); |
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141 gst_bin_remove (GST_BIN (sink), sink->kid); |
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142 sink->kid = NULL; |
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143 } |
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144 } |
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145 |
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146 /* |
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147 * Hack to make initial linking work; ideally, this'd work even when |
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148 * no target has been assigned to the ghostpad yet. |
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149 */ |
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150 |
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151 static void |
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152 gst_auto_video_sink_reset (GstAutoVideoSink * sink) |
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153 { |
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154 GstPad *targetpad; |
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155 |
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156 /* Remove any existing element */ |
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157 gst_auto_video_sink_clear_kid (sink); |
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158 |
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159 /* fakesink placeholder */ |
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160 sink->kid = gst_element_factory_make ("fakesink", "tempsink"); |
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161 gst_bin_add (GST_BIN (sink), sink->kid); |
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162 |
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163 /* pad */ |
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164 targetpad = gst_element_get_pad (sink->kid, "sink"); |
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165 gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad); |
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166 gst_object_unref (targetpad); |
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167 } |
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168 |
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169 static GstStaticCaps raw_caps = |
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170 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb"); |
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171 |
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172 static void |
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173 gst_auto_video_sink_init (GstAutoVideoSink * sink, |
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174 GstAutoVideoSinkClass * g_class) |
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175 { |
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176 sink->pad = gst_ghost_pad_new_no_target ("sink", GST_PAD_SINK); |
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177 gst_element_add_pad (GST_ELEMENT (sink), sink->pad); |
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178 |
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179 gst_auto_video_sink_reset (sink); |
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180 |
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181 /* set the default raw video caps */ |
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182 sink->filter_caps = gst_static_caps_get (&raw_caps); |
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183 |
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184 /* mark as sink */ |
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185 GST_OBJECT_FLAG_SET (sink, GST_ELEMENT_IS_SINK); |
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186 } |
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187 |
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188 static gboolean |
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189 gst_auto_video_sink_factory_filter (GstPluginFeature * feature, gpointer data) |
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190 { |
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191 guint rank; |
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192 const gchar *klass; |
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193 |
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194 /* we only care about element factories */ |
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195 if (!GST_IS_ELEMENT_FACTORY (feature)) |
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196 return FALSE; |
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197 |
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198 /* video sinks */ |
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199 klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature)); |
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200 if (!(strstr (klass, "Sink") && strstr (klass, "Video"))) |
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201 return FALSE; |
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202 |
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203 /* only select elements with autoplugging rank */ |
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204 rank = gst_plugin_feature_get_rank (feature); |
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205 if (rank < GST_RANK_MARGINAL) |
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206 return FALSE; |
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207 |
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208 return TRUE; |
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209 } |
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210 |
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211 static gint |
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212 gst_auto_video_sink_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2) |
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213 { |
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214 gint diff; |
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215 |
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216 diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1); |
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217 if (diff != 0) |
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218 return diff; |
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219 return strcmp (gst_plugin_feature_get_name (f2), |
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220 gst_plugin_feature_get_name (f1)); |
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221 } |
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222 |
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223 static GstElement * |
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224 gst_auto_video_sink_create_element_with_pretty_name (GstAutoVideoSink * sink, |
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225 GstElementFactory * factory) |
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226 { |
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227 GstElement *element; |
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228 gchar *name, *marker; |
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229 |
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230 marker = g_strdup (GST_PLUGIN_FEATURE (factory)->name); |
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231 if (g_str_has_suffix (marker, "sink")) |
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232 marker[strlen (marker) - 4] = '\0'; |
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233 if (g_str_has_prefix (marker, "gst")) |
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234 g_memmove (marker, marker + 3, strlen (marker + 3) + 1); |
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235 name = g_strdup_printf ("%s-actual-sink-%s", GST_OBJECT_NAME (sink), marker); |
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236 g_free (marker); |
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237 |
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238 element = gst_element_factory_create (factory, name); |
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239 g_free (name); |
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240 |
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241 return element; |
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242 } |
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243 |
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244 static GstElement * |
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245 gst_auto_video_sink_find_best (GstAutoVideoSink * sink) |
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246 { |
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247 GList *list, *item; |
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248 GstElement *choice = NULL; |
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249 GstMessage *message = NULL; |
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250 GSList *errors = NULL; |
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251 GstBus *bus = gst_bus_new (); |
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252 GstPad *el_pad = NULL; |
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253 GstCaps *el_caps = NULL, *intersect = NULL; |
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254 gboolean no_match = TRUE; |
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255 |
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256 list = gst_registry_feature_filter (gst_registry_get_default (), |
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257 (GstPluginFeatureFilter) gst_auto_video_sink_factory_filter, FALSE, sink); |
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258 list = g_list_sort (list, (GCompareFunc) gst_auto_video_sink_compare_ranks); |
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259 |
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260 GST_LOG_OBJECT (sink, "Trying to find usable video devices ..."); |
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261 |
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262 for (item = list; item != NULL; item = item->next) { |
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263 GstElementFactory *f = GST_ELEMENT_FACTORY (item->data); |
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264 GstElement *el; |
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265 |
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266 if ((el = gst_auto_video_sink_create_element_with_pretty_name (sink, f))) { |
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267 GstStateChangeReturn ret; |
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268 |
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269 GST_DEBUG_OBJECT (sink, "Testing %s", GST_PLUGIN_FEATURE (f)->name); |
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270 |
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271 /* If autovideosink has been provided with filter caps, |
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272 * accept only sinks that match with the filter caps */ |
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273 if (sink->filter_caps) { |
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274 el_pad = gst_element_get_static_pad (GST_ELEMENT (el), "sink"); |
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275 el_caps = gst_pad_get_caps (el_pad); |
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276 gst_object_unref (el_pad); |
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277 GST_DEBUG_OBJECT (sink, |
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278 "Checking caps: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT, |
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279 sink->filter_caps, el_caps); |
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280 intersect = gst_caps_intersect (sink->filter_caps, el_caps); |
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281 no_match = gst_caps_is_empty (intersect); |
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282 gst_caps_unref (el_caps); |
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283 gst_caps_unref (intersect); |
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284 |
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285 if (no_match) { |
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286 GST_DEBUG_OBJECT (sink, "Incompatible caps"); |
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287 gst_object_unref (el); |
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288 continue; |
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289 } else { |
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290 GST_DEBUG_OBJECT (sink, "Found compatible caps"); |
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291 } |
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292 } |
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293 |
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294 gst_element_set_bus (el, bus); |
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295 ret = gst_element_set_state (el, GST_STATE_READY); |
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296 if (ret == GST_STATE_CHANGE_SUCCESS) { |
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297 GST_DEBUG_OBJECT (sink, "This worked!"); |
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298 choice = el; |
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299 break; |
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300 } |
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301 |
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302 /* collect all error messages */ |
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303 while ((message = gst_bus_pop_filtered (bus, GST_MESSAGE_ERROR))) { |
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304 GST_DEBUG_OBJECT (sink, "error message %" GST_PTR_FORMAT, message); |
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305 errors = g_slist_append (errors, message); |
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306 } |
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307 |
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308 gst_element_set_state (el, GST_STATE_NULL); |
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309 gst_object_unref (el); |
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310 } |
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311 } |
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312 |
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313 GST_DEBUG_OBJECT (sink, "done trying"); |
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314 if (!choice) { |
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315 if (errors) { |
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316 /* FIXME: we forward the first error for now; but later on it might make |
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317 * sense to actually analyse them */ |
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318 gst_message_ref (GST_MESSAGE (errors->data)); |
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319 GST_DEBUG_OBJECT (sink, "reposting message %p", errors->data); |
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320 gst_element_post_message (GST_ELEMENT (sink), GST_MESSAGE (errors->data)); |
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321 } else { |
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322 /* send warning message to application and use a fakesink */ |
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323 GST_ELEMENT_WARNING (sink, RESOURCE, NOT_FOUND, (NULL), |
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324 ("Failed to find a usable video sink")); |
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325 choice = gst_element_factory_make ("fakesink", "fake-video-sink"); |
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326 if (g_object_class_find_property (G_OBJECT_GET_CLASS (choice), "sync")) |
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327 g_object_set (choice, "sync", TRUE, NULL); |
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328 gst_element_set_state (choice, GST_STATE_READY); |
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329 } |
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330 } |
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331 gst_object_unref (bus); |
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332 gst_plugin_feature_list_free (list); |
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333 g_slist_foreach (errors, (GFunc) gst_mini_object_unref, NULL); |
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334 g_slist_free (errors); |
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335 |
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336 return choice; |
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337 } |
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338 |
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339 static gboolean |
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340 gst_auto_video_sink_detect (GstAutoVideoSink * sink) |
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341 { |
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342 GstElement *esink; |
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343 GstPad *targetpad; |
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344 |
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345 gst_auto_video_sink_clear_kid (sink); |
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346 |
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347 /* find element */ |
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348 GST_DEBUG_OBJECT (sink, "Creating new kid"); |
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349 if (!(esink = gst_auto_video_sink_find_best (sink))) |
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350 goto no_sink; |
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351 |
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352 sink->kid = esink; |
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353 gst_bin_add (GST_BIN (sink), esink); |
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354 |
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355 /* attach ghost pad */ |
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356 GST_DEBUG_OBJECT (sink, "Re-assigning ghostpad"); |
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357 targetpad = gst_element_get_pad (sink->kid, "sink"); |
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358 gst_ghost_pad_set_target (GST_GHOST_PAD (sink->pad), targetpad); |
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359 gst_object_unref (targetpad); |
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360 GST_DEBUG_OBJECT (sink, "done changing auto video sink"); |
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361 |
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362 return TRUE; |
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363 |
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364 /* ERRORS */ |
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365 no_sink: |
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366 { |
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367 GST_ELEMENT_ERROR (sink, LIBRARY, INIT, (NULL), |
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368 ("Failed to find a supported video sink")); |
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369 return FALSE; |
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370 } |
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371 } |
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372 |
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373 static GstStateChangeReturn |
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374 gst_auto_video_sink_change_state (GstElement * element, |
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375 GstStateChange transition) |
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376 { |
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377 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; |
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378 GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (element); |
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379 |
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380 switch (transition) { |
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381 case GST_STATE_CHANGE_NULL_TO_READY: |
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382 if (!gst_auto_video_sink_detect (sink)) |
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383 return GST_STATE_CHANGE_FAILURE; |
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384 break; |
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385 default: |
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386 break; |
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387 } |
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388 |
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389 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); |
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390 |
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391 switch (transition) { |
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392 case GST_STATE_CHANGE_READY_TO_NULL: |
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393 gst_auto_video_sink_reset (sink); |
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394 break; |
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395 default: |
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396 break; |
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397 } |
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398 |
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399 return ret; |
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400 } |
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401 |
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402 static void |
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403 gst_auto_video_sink_set_property (GObject * object, guint prop_id, |
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404 const GValue * value, GParamSpec * pspec) |
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405 { |
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406 GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (object); |
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407 |
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408 switch (prop_id) { |
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409 case PROP_CAPS: |
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410 if (sink->filter_caps) |
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411 gst_caps_unref (sink->filter_caps); |
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412 sink->filter_caps = gst_caps_copy (gst_value_get_caps (value)); |
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413 break; |
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414 default: |
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415 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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416 break; |
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417 } |
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418 } |
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419 |
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420 static void |
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421 gst_auto_video_sink_get_property (GObject * object, guint prop_id, |
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422 GValue * value, GParamSpec * pspec) |
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423 { |
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424 GstAutoVideoSink *sink = GST_AUTO_VIDEO_SINK (object); |
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425 |
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426 switch (prop_id) { |
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427 case PROP_CAPS:{ |
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428 gst_value_set_caps (value, sink->filter_caps); |
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429 break; |
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430 } |
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431 default: |
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432 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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433 break; |
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434 } |
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435 } |
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