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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 * (c) 2008 Stefan Kost <ensonic@users.sf.net> |
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5 * |
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6 * This library is free software; you can redistribute it and/or |
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7 * modify it under the terms of the GNU Library General Public |
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8 * License as published by the Free Software Foundation; either |
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9 * version 2 of the License, or (at your option) any later version. |
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10 * |
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11 * This library is distributed in the hope that it will be useful, |
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 * Library General Public License for more details. |
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15 * |
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16 * You should have received a copy of the GNU Library General Public |
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17 * License along with this library; if not, write to the |
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18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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19 * Boston, MA 02111-1307, USA. |
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20 */ |
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21 |
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22 /** |
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23 * SECTION:element-autovideosrc |
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24 * @see_also: autoaudiosrc, v4l2src, v4lsrc |
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25 * |
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26 * autovideosrc is a video src that automatically detects an appropriate |
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27 * video source to use. It does so by scanning the registry for all elements |
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28 * that have <quote>Source</quote> and <quote>Video</quote> in the class field |
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29 * of their element information, and also have a non-zero autoplugging rank. |
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30 * |
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31 * <refsect2> |
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32 * <title>Example launch line</title> |
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33 * |[ |
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34 * gst-launch -v -m autovideosrc ! xvimagesink |
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35 * ]| |
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36 * </refsect2> |
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37 */ |
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38 |
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39 #ifdef HAVE_CONFIG_H |
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40 #include "config.h" |
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41 #endif |
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42 |
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43 #include <string.h> |
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44 |
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45 #include "gstautovideosrc.h" |
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46 #include "gstautodetect.h" |
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47 |
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48 /* Properties */ |
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49 enum |
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50 { |
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51 PROP_0, |
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52 PROP_CAPS, |
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53 }; |
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54 |
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55 static GstStateChangeReturn |
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56 gst_auto_video_src_change_state (GstElement * element, |
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57 GstStateChange transition); |
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58 static void gst_auto_video_src_dispose (GstAutoVideoSrc * src); |
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59 static void gst_auto_video_src_clear_kid (GstAutoVideoSrc * src); |
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60 |
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61 static void gst_auto_video_src_set_property (GObject * object, guint prop_id, |
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62 const GValue * value, GParamSpec * pspec); |
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63 static void gst_auto_video_src_get_property (GObject * object, guint prop_id, |
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64 GValue * value, GParamSpec * pspec); |
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65 |
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66 GST_BOILERPLATE (GstAutoVideoSrc, gst_auto_video_src, GstBin, GST_TYPE_BIN); |
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67 |
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68 static const GstElementDetails gst_auto_video_src_details = |
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69 GST_ELEMENT_DETAILS ("Auto video source", |
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70 "Source/Video", |
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71 "Wrapper video source for automatically detected video source", |
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72 "Ronald Bultje <rbultje@ronald.bitfreak.net>\n" |
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73 "Jan Schmidt <thaytan@noraisin.net>\n" |
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74 "Stefan Kost <ensonic@users.sf.net>"); |
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75 |
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76 static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", |
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77 GST_PAD_SRC, |
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78 GST_PAD_ALWAYS, |
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79 GST_STATIC_CAPS_ANY); |
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80 |
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81 static void |
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82 gst_auto_video_src_base_init (gpointer klass) |
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83 { |
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84 GstElementClass *eklass = GST_ELEMENT_CLASS (klass); |
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85 |
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86 gst_element_class_add_pad_template (eklass, |
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87 gst_static_pad_template_get (&src_template)); |
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88 gst_element_class_set_details (eklass, &gst_auto_video_src_details); |
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89 } |
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90 |
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91 static void |
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92 gst_auto_video_src_class_init (GstAutoVideoSrcClass * klass) |
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93 { |
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94 GObjectClass *gobject_class; |
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95 GstElementClass *eklass = GST_ELEMENT_CLASS (klass); |
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96 |
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97 gobject_class = G_OBJECT_CLASS (klass); |
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98 gobject_class->dispose = |
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99 (GObjectFinalizeFunc) GST_DEBUG_FUNCPTR (gst_auto_video_src_dispose); |
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100 eklass->change_state = GST_DEBUG_FUNCPTR (gst_auto_video_src_change_state); |
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101 gobject_class->set_property = |
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102 GST_DEBUG_FUNCPTR (gst_auto_video_src_set_property); |
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103 gobject_class->get_property = |
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104 GST_DEBUG_FUNCPTR (gst_auto_video_src_get_property); |
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105 |
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106 /** |
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107 * GstAutoVideoSrc:filter-caps |
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108 * |
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109 * This property will filter out candidate sources that can handle the specified |
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110 * caps. By default only video sources that support raw rgb and yuv video |
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111 * are selected. |
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112 * |
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113 * This property can only be set before the element goes to the READY state. |
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114 * |
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115 * Since: 0.10.14 |
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116 **/ |
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117 g_object_class_install_property (gobject_class, PROP_CAPS, |
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118 g_param_spec_boxed ("filter-caps", "Filter caps", |
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119 "Filter src candidates using these caps.", GST_TYPE_CAPS, |
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120 G_PARAM_READWRITE)); |
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121 } |
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122 |
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123 static void |
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124 gst_auto_video_src_dispose (GstAutoVideoSrc * src) |
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125 { |
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126 gst_auto_video_src_clear_kid (src); |
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127 |
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128 if (src->filter_caps) |
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129 gst_caps_unref (src->filter_caps); |
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130 src->filter_caps = NULL; |
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131 |
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132 G_OBJECT_CLASS (parent_class)->dispose ((GObject *) src); |
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133 } |
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134 |
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135 static void |
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136 gst_auto_video_src_clear_kid (GstAutoVideoSrc * src) |
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137 { |
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138 if (src->kid) { |
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139 gst_element_set_state (src->kid, GST_STATE_NULL); |
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140 gst_bin_remove (GST_BIN (src), src->kid); |
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141 src->kid = NULL; |
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142 } |
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143 } |
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144 |
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145 /* |
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146 * Hack to make initial linking work; ideally, this'd work even when |
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147 * no target has been assigned to the ghostpad yet. |
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148 */ |
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149 |
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150 static void |
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151 gst_auto_video_src_reset (GstAutoVideoSrc * src) |
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152 { |
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153 GstPad *targetpad; |
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154 |
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155 /* Remove any existing element */ |
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156 gst_auto_video_src_clear_kid (src); |
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157 |
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158 /* fakesrc placeholder */ |
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159 src->kid = gst_element_factory_make ("fakesrc", "tempsrc"); |
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160 gst_bin_add (GST_BIN (src), src->kid); |
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161 |
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162 /* pad */ |
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163 targetpad = gst_element_get_static_pad (src->kid, "src"); |
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164 gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad); |
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165 gst_object_unref (targetpad); |
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166 } |
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167 |
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168 static GstStaticCaps raw_caps = |
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169 GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb"); |
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170 |
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171 static void |
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172 gst_auto_video_src_init (GstAutoVideoSrc * src, GstAutoVideoSrcClass * g_class) |
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173 { |
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174 src->pad = gst_ghost_pad_new_no_target ("src", GST_PAD_SRC); |
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175 gst_element_add_pad (GST_ELEMENT (src), src->pad); |
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176 |
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177 gst_auto_video_src_reset (src); |
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178 |
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179 /* set the default raw video caps */ |
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180 src->filter_caps = gst_static_caps_get (&raw_caps); |
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181 |
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182 /* mark as source */ |
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183 GST_OBJECT_FLAG_UNSET (src, GST_ELEMENT_IS_SINK); |
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184 } |
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185 |
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186 static gboolean |
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187 gst_auto_video_src_factory_filter (GstPluginFeature * feature, gpointer data) |
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188 { |
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189 guint rank; |
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190 const gchar *klass; |
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191 |
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192 /* we only care about element factories */ |
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193 if (!GST_IS_ELEMENT_FACTORY (feature)) |
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194 return FALSE; |
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195 |
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196 /* video sources */ |
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197 klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature)); |
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198 if (!(strstr (klass, "Source") && strstr (klass, "Video"))) |
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199 return FALSE; |
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200 |
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201 /* only select elements with autoplugging rank */ |
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202 rank = gst_plugin_feature_get_rank (feature); |
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203 if (rank < GST_RANK_MARGINAL) |
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204 return FALSE; |
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205 |
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206 return TRUE; |
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207 } |
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208 |
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209 static gint |
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210 gst_auto_video_src_compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2) |
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211 { |
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212 gint diff; |
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213 |
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214 diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1); |
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215 if (diff != 0) |
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216 return diff; |
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217 return strcmp (gst_plugin_feature_get_name (f2), |
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218 gst_plugin_feature_get_name (f1)); |
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219 } |
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220 |
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221 static GstElement * |
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222 gst_auto_video_src_create_element_with_pretty_name (GstAutoVideoSrc * src, |
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223 GstElementFactory * factory) |
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224 { |
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225 GstElement *element; |
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226 gchar *name, *marker; |
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227 |
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228 marker = g_strdup (GST_PLUGIN_FEATURE (factory)->name); |
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229 if (g_str_has_suffix (marker, "src")) |
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230 marker[strlen (marker) - 4] = '\0'; |
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231 if (g_str_has_prefix (marker, "gst")) |
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232 g_memmove (marker, marker + 3, strlen (marker + 3) + 1); |
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233 name = g_strdup_printf ("%s-actual-src-%s", GST_OBJECT_NAME (src), marker); |
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234 g_free (marker); |
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235 |
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236 element = gst_element_factory_create (factory, name); |
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237 g_free (name); |
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238 |
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239 return element; |
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240 } |
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241 |
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242 static GstElement * |
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243 gst_auto_video_src_find_best (GstAutoVideoSrc * src) |
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244 { |
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245 GList *list, *item; |
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246 GstElement *choice = NULL; |
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247 GstMessage *message = NULL; |
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248 GSList *errors = NULL; |
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249 GstBus *bus = gst_bus_new (); |
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250 GstPad *el_pad = NULL; |
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251 GstCaps *el_caps = NULL, *intersect = NULL; |
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252 gboolean no_match = TRUE; |
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253 |
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254 list = gst_registry_feature_filter (gst_registry_get_default (), |
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255 (GstPluginFeatureFilter) gst_auto_video_src_factory_filter, FALSE, src); |
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256 list = g_list_sort (list, (GCompareFunc) gst_auto_video_src_compare_ranks); |
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257 |
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258 GST_LOG_OBJECT (src, "Trying to find usable video devices ..."); |
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259 |
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260 for (item = list; item != NULL; item = item->next) { |
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261 GstElementFactory *f = GST_ELEMENT_FACTORY (item->data); |
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262 GstElement *el; |
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263 |
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264 if ((el = gst_auto_video_src_create_element_with_pretty_name (src, f))) { |
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265 GstStateChangeReturn ret; |
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266 |
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267 GST_DEBUG_OBJECT (src, "Testing %s", GST_PLUGIN_FEATURE (f)->name); |
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268 |
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269 /* If AutoVideoSrc has been provided with filter caps, |
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270 * accept only sources that match with the filter caps */ |
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271 if (src->filter_caps) { |
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272 el_pad = gst_element_get_static_pad (GST_ELEMENT (el), "src"); |
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273 el_caps = gst_pad_get_caps (el_pad); |
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274 gst_object_unref (el_pad); |
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275 GST_DEBUG_OBJECT (src, |
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276 "Checking caps: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT, |
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277 src->filter_caps, el_caps); |
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278 intersect = gst_caps_intersect (src->filter_caps, el_caps); |
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279 no_match = gst_caps_is_empty (intersect); |
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280 gst_caps_unref (el_caps); |
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281 gst_caps_unref (intersect); |
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282 |
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283 if (no_match) { |
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284 GST_DEBUG_OBJECT (src, "Incompatible caps"); |
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285 gst_object_unref (el); |
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286 continue; |
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287 } else { |
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288 GST_DEBUG_OBJECT (src, "Found compatible caps"); |
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289 } |
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290 } |
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291 |
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292 gst_element_set_bus (el, bus); |
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293 ret = gst_element_set_state (el, GST_STATE_READY); |
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294 if (ret == GST_STATE_CHANGE_SUCCESS) { |
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295 GST_DEBUG_OBJECT (src, "This worked!"); |
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296 choice = el; |
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297 break; |
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298 } |
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299 |
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300 /* collect all error messages */ |
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301 while ((message = gst_bus_pop_filtered (bus, GST_MESSAGE_ERROR))) { |
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302 GST_DEBUG_OBJECT (src, "error message %" GST_PTR_FORMAT, message); |
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303 errors = g_slist_append (errors, message); |
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304 } |
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305 |
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306 gst_element_set_state (el, GST_STATE_NULL); |
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307 gst_object_unref (el); |
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308 } |
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309 } |
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310 |
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311 GST_DEBUG_OBJECT (src, "done trying"); |
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312 if (!choice) { |
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313 if (errors) { |
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314 /* FIXME: we forward the first error for now; but later on it might make |
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315 * sense to actually analyse them */ |
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316 gst_message_ref (GST_MESSAGE (errors->data)); |
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317 GST_DEBUG_OBJECT (src, "reposting message %p", errors->data); |
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318 gst_element_post_message (GST_ELEMENT (src), GST_MESSAGE (errors->data)); |
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319 } else { |
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320 /* send warning message to application and use a fakesrc */ |
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321 GST_ELEMENT_WARNING (src, RESOURCE, NOT_FOUND, (NULL), |
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322 ("Failed to find a usable video source")); |
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323 choice = gst_element_factory_make ("fakesrc", "fake-video-src"); |
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324 if (g_object_class_find_property (G_OBJECT_GET_CLASS (choice), "sync")) |
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325 g_object_set (choice, "sync", TRUE, NULL); |
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326 gst_element_set_state (choice, GST_STATE_READY); |
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327 } |
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328 } |
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329 gst_object_unref (bus); |
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330 gst_plugin_feature_list_free (list); |
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331 g_slist_foreach (errors, (GFunc) gst_mini_object_unref, NULL); |
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332 g_slist_free (errors); |
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333 |
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334 return choice; |
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335 } |
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336 |
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337 static gboolean |
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338 gst_auto_video_src_detect (GstAutoVideoSrc * src) |
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339 { |
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340 GstElement *esrc; |
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341 GstPad *targetpad; |
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342 |
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343 gst_auto_video_src_clear_kid (src); |
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344 |
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345 /* find element */ |
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346 GST_DEBUG_OBJECT (src, "Creating new kid"); |
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347 if (!(esrc = gst_auto_video_src_find_best (src))) |
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348 goto no_src; |
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349 |
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350 src->kid = esrc; |
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351 gst_bin_add (GST_BIN (src), esrc); |
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352 |
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353 /* attach ghost pad */ |
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354 GST_DEBUG_OBJECT (src, "Re-assigning ghostpad"); |
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355 targetpad = gst_element_get_static_pad (src->kid, "src"); |
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356 if (!gst_ghost_pad_set_target (GST_GHOST_PAD (src->pad), targetpad)) |
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357 goto target_failed; |
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358 |
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359 gst_object_unref (targetpad); |
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360 GST_DEBUG_OBJECT (src, "done changing auto video source"); |
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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_src: |
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366 { |
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367 GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL), |
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368 ("Failed to find a supported video source")); |
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369 return FALSE; |
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370 } |
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371 target_failed: |
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372 { |
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373 GST_ELEMENT_ERROR (src, LIBRARY, INIT, (NULL), |
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374 ("Failed to set target pad")); |
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375 gst_object_unref (targetpad); |
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376 return FALSE; |
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377 } |
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378 } |
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379 |
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380 static GstStateChangeReturn |
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381 gst_auto_video_src_change_state (GstElement * element, |
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382 GstStateChange transition) |
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383 { |
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384 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; |
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385 GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (element); |
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386 |
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387 switch (transition) { |
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388 case GST_STATE_CHANGE_NULL_TO_READY: |
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389 if (!gst_auto_video_src_detect (src)) |
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390 return GST_STATE_CHANGE_FAILURE; |
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391 break; |
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392 default: |
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393 break; |
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394 } |
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395 |
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396 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); |
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397 |
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398 switch (transition) { |
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399 case GST_STATE_CHANGE_READY_TO_NULL: |
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400 gst_auto_video_src_reset (src); |
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401 break; |
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402 default: |
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403 break; |
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404 } |
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405 |
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406 return ret; |
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407 } |
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408 |
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409 static void |
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410 gst_auto_video_src_set_property (GObject * object, guint prop_id, |
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411 const GValue * value, GParamSpec * pspec) |
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412 { |
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413 GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (object); |
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414 |
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415 switch (prop_id) { |
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416 case PROP_CAPS: |
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417 if (src->filter_caps) |
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418 gst_caps_unref (src->filter_caps); |
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419 src->filter_caps = gst_caps_copy (gst_value_get_caps (value)); |
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420 break; |
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421 default: |
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422 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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423 break; |
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424 } |
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425 } |
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426 |
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427 static void |
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428 gst_auto_video_src_get_property (GObject * object, guint prop_id, |
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429 GValue * value, GParamSpec * pspec) |
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430 { |
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431 GstAutoVideoSrc *src = GST_AUTO_VIDEO_SRC (object); |
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432 |
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433 switch (prop_id) { |
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434 case PROP_CAPS:{ |
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435 gst_value_set_caps (value, src->filter_caps); |
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436 break; |
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437 } |
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438 default: |
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439 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
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440 break; |
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441 } |
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442 } |