1 /*
2 * GStreamer
3 * Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include "gstglfilterbin.h"
26
27 #define GST_CAT_DEFAULT gst_gl_filter_bin_debug
28 GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
29
30 /* Properties */
31 enum
32 {
33 PROP_0,
34 PROP_FILTER,
35 };
36
37 enum
38 {
39 SIGNAL_0,
40 SIGNAL_CREATE_ELEMENT,
41 LAST_SIGNAL
42 };
43
44 static guint gst_gl_filter_bin_signals[LAST_SIGNAL] = { 0 };
45
46 #define gst_gl_filter_bin_parent_class parent_class
47 G_DEFINE_TYPE_WITH_CODE (GstGLFilterBin, gst_gl_filter_bin,
48 GST_TYPE_BIN, GST_DEBUG_CATEGORY_INIT (gst_gl_filter_bin_debug,
49 "glfilterbin", 0, "glfilterbin element"););
50
51 static void gst_gl_filter_bin_finalize (GObject * object);
52 static void gst_gl_filter_bin_get_property (GObject * object, guint prop_id,
53 GValue * value, GParamSpec * pspec);
54 static void gst_gl_filter_bin_set_property (GObject * object, guint prop_id,
55 const GValue * value, GParamSpec * pspec);
56
57 static GstStateChangeReturn gst_gl_filter_bin_change_state (GstElement *
58 element, GstStateChange transition);
59
60 static GstStaticPadTemplate _src_pad_template = GST_STATIC_PAD_TEMPLATE ("src",
61 GST_PAD_SRC,
62 GST_PAD_ALWAYS,
63 GST_STATIC_CAPS ("video/x-raw(ANY)"));
64
65 static void
gst_gl_filter_bin_class_init(GstGLFilterBinClass * klass)66 gst_gl_filter_bin_class_init (GstGLFilterBinClass * klass)
67 {
68 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
69 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
70 GstCaps *upload_caps;
71
72 element_class->change_state = gst_gl_filter_bin_change_state;
73
74 gobject_class->set_property = gst_gl_filter_bin_set_property;
75 gobject_class->get_property = gst_gl_filter_bin_get_property;
76 gobject_class->finalize = gst_gl_filter_bin_finalize;
77
78 gst_element_class_add_static_pad_template (element_class, &_src_pad_template);
79
80 upload_caps = gst_gl_upload_get_input_template_caps ();
81 gst_element_class_add_pad_template (element_class,
82 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, upload_caps));
83 gst_caps_unref (upload_caps);
84
85 g_object_class_install_property (gobject_class, PROP_FILTER,
86 g_param_spec_object ("filter",
87 "GL filter element",
88 "The GL filter chain to use",
89 GST_TYPE_ELEMENT,
90 GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
91 G_PARAM_STATIC_STRINGS));
92
93 /**
94 * GstFilterBin::create-element:
95 * @object: the #GstGLFilterBin
96 *
97 * Will be emitted when we need the processing element/s that this bin will use
98 *
99 * Returns: a new #GstElement
100 */
101 gst_gl_filter_bin_signals[SIGNAL_CREATE_ELEMENT] =
102 g_signal_new ("create-element", G_TYPE_FROM_CLASS (klass),
103 G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
104 GST_TYPE_ELEMENT, 0);
105
106 gst_element_class_set_metadata (element_class,
107 "GL Filter Bin", "Filter/Video",
108 "Infrastructure to process GL textures",
109 "Matthew Waters <matthew@centricular.com>");
110 }
111
112 static void
gst_gl_filter_bin_init(GstGLFilterBin * self)113 gst_gl_filter_bin_init (GstGLFilterBin * self)
114 {
115 GstPad *pad;
116
117 self->upload = gst_element_factory_make ("glupload", NULL);
118 self->in_convert = gst_element_factory_make ("glcolorconvert", NULL);
119 self->out_convert = gst_element_factory_make ("glcolorconvert", NULL);
120 self->download = gst_element_factory_make ("gldownload", NULL);
121
122 gst_bin_add (GST_BIN (self), self->upload);
123 gst_bin_add (GST_BIN (self), self->in_convert);
124 gst_bin_add (GST_BIN (self), self->out_convert);
125 gst_bin_add (GST_BIN (self), self->download);
126
127 gst_element_link_pads (self->upload, "src", self->in_convert, "sink");
128 gst_element_link_pads (self->out_convert, "src", self->download, "sink");
129
130 pad = gst_element_get_static_pad (self->download, "src");
131 if (pad) {
132 GST_DEBUG_OBJECT (self, "setting target src pad %" GST_PTR_FORMAT, pad);
133 self->srcpad = gst_ghost_pad_new ("src", pad);
134 gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
135 gst_object_unref (pad);
136 }
137
138 pad = gst_element_get_static_pad (self->upload, "sink");
139 if (pad) {
140 GST_DEBUG_OBJECT (self, "setting target sink pad %" GST_PTR_FORMAT, pad);
141 self->sinkpad = gst_ghost_pad_new ("sink", pad);
142 gst_element_add_pad (GST_ELEMENT_CAST (self), self->sinkpad);
143 gst_object_unref (pad);
144 }
145 }
146
147 static void
gst_gl_filter_bin_finalize(GObject * object)148 gst_gl_filter_bin_finalize (GObject * object)
149 {
150 GstGLFilterBin *self = GST_GL_FILTER_BIN (object);
151
152 if (self->filter)
153 gst_object_unref (self->filter);
154
155 G_OBJECT_CLASS (parent_class)->finalize (object);
156 }
157
158 static gboolean
_connect_filter_element(GstGLFilterBin * self)159 _connect_filter_element (GstGLFilterBin * self)
160 {
161 gboolean res = TRUE;
162
163 gst_object_set_name (GST_OBJECT (self->filter), "filter");
164 res &= gst_bin_add (GST_BIN (self), self->filter);
165
166 res &= gst_element_link_pads (self->in_convert, "src", self->filter, "sink");
167 res &= gst_element_link_pads (self->filter, "src", self->out_convert, "sink");
168
169 if (!res)
170 GST_ERROR_OBJECT (self, "Failed to link filter element into the pipeline");
171
172 return res;
173 }
174
175 /*
176 * @filter: (transfer floating):
177 */
178 static gboolean
gst_gl_filter_bin_set_filter(GstGLFilterBin * self,GstElement * filter)179 gst_gl_filter_bin_set_filter (GstGLFilterBin * self, GstElement * filter)
180 {
181 g_return_val_if_fail (GST_IS_ELEMENT (filter), FALSE);
182
183 if (self->filter) {
184 gst_element_set_locked_state (self->filter, TRUE);
185 gst_bin_remove (GST_BIN (self), self->filter);
186 gst_element_set_state (self->filter, GST_STATE_NULL);
187 gst_object_unref (self->filter);
188 self->filter = NULL;
189 }
190 self->filter = filter;
191
192 gst_object_ref_sink (filter);
193
194 if (filter && !_connect_filter_element (self)) {
195 gst_object_unref (self->filter);
196 self->filter = NULL;
197 return FALSE;
198 }
199
200 return TRUE;
201 }
202
203 void
gst_gl_filter_bin_finish_init_with_element(GstGLFilterBin * self,GstElement * element)204 gst_gl_filter_bin_finish_init_with_element (GstGLFilterBin * self,
205 GstElement * element)
206 {
207 gst_gl_filter_bin_set_filter (self, element);
208 }
209
210 void
gst_gl_filter_bin_finish_init(GstGLFilterBin * self)211 gst_gl_filter_bin_finish_init (GstGLFilterBin * self)
212 {
213 GstGLFilterBinClass *klass = GST_GL_FILTER_BIN_GET_CLASS (self);
214 GstElement *element = NULL;
215
216 if (klass->create_element)
217 element = klass->create_element ();
218
219 if (element)
220 gst_gl_filter_bin_finish_init_with_element (self, element);
221 }
222
223 static void
gst_gl_filter_bin_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)224 gst_gl_filter_bin_get_property (GObject * object, guint prop_id,
225 GValue * value, GParamSpec * pspec)
226 {
227 GstGLFilterBin *self = GST_GL_FILTER_BIN (object);
228
229 switch (prop_id) {
230 case PROP_FILTER:
231 g_value_set_object (value, self->filter);
232 break;
233 default:
234 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
235 break;
236 }
237 }
238
239 static void
gst_gl_filter_bin_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)240 gst_gl_filter_bin_set_property (GObject * object, guint prop_id,
241 const GValue * value, GParamSpec * pspec)
242 {
243 GstGLFilterBin *self = GST_GL_FILTER_BIN (object);
244
245 switch (prop_id) {
246 case PROP_FILTER:
247 gst_gl_filter_bin_set_filter (self, g_value_get_object (value));
248 break;
249 default:
250 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
251 break;
252 }
253 }
254
255 static GstStateChangeReturn
gst_gl_filter_bin_change_state(GstElement * element,GstStateChange transition)256 gst_gl_filter_bin_change_state (GstElement * element, GstStateChange transition)
257 {
258 GstGLFilterBin *self = GST_GL_FILTER_BIN (element);
259 GstGLFilterBinClass *klass = GST_GL_FILTER_BIN_GET_CLASS (self);
260 GstStateChangeReturn ret;
261
262 switch (transition) {
263 case GST_STATE_CHANGE_NULL_TO_READY:
264 if (!self->filter) {
265 if (klass->create_element)
266 self->filter = klass->create_element ();
267
268 if (!self->filter) {
269 g_signal_emit (element,
270 gst_gl_filter_bin_signals[SIGNAL_CREATE_ELEMENT], 0,
271 &self->filter);
272 if (self->filter && g_object_is_floating (self->filter))
273 gst_object_ref_sink (self->filter);
274 }
275
276 if (!self->filter) {
277 GST_ERROR_OBJECT (element, "Failed to retrieve element");
278 return GST_STATE_CHANGE_FAILURE;
279 }
280 if (!_connect_filter_element (self))
281 return GST_STATE_CHANGE_FAILURE;
282 }
283 break;
284 default:
285 break;
286 }
287
288 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
289 if (ret == GST_STATE_CHANGE_FAILURE)
290 return ret;
291
292 switch (transition) {
293 default:
294 break;
295 }
296
297 return ret;
298 }
299