2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2005 Wim Taymans <wim@fluendo.com>
5 * 2005 David Schleef <ds@schleef.org>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 * SECTION:element-capsfilter
25 * The element does not modify data as such, but can enforce limitations on the
33 #include "../../gst/gst-i18n-lib.h"
34 #include "gstcapsfilter.h"
43 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
48 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
54 GST_DEBUG_CATEGORY_STATIC (gst_capsfilter_debug);
55 #define GST_CAT_DEFAULT gst_capsfilter_debug
57 #define _do_init(bla) \
58 GST_DEBUG_CATEGORY_INIT (gst_capsfilter_debug, "capsfilter", 0, \
59 "capsfilter element");
61 GST_BOILERPLATE_FULL (GstCapsFilter, gst_capsfilter, GstBaseTransform,
62 GST_TYPE_BASE_TRANSFORM, _do_init);
65 static void gst_capsfilter_set_property (GObject * object, guint prop_id,
66 const GValue * value, GParamSpec * pspec);
67 static void gst_capsfilter_get_property (GObject * object, guint prop_id,
68 GValue * value, GParamSpec * pspec);
69 static void gst_capsfilter_dispose (GObject * object);
71 static GstCaps *gst_capsfilter_transform_caps (GstBaseTransform * base,
72 GstPadDirection direction, GstCaps * caps);
73 static GstFlowReturn gst_capsfilter_transform_ip (GstBaseTransform * base,
75 static GstFlowReturn gst_capsfilter_prepare_buf (GstBaseTransform * trans,
76 GstBuffer * input, gint size, GstCaps * caps, GstBuffer ** buf);
77 static gboolean gst_capsfilter_transform_size (GstBaseTransform * trans,
78 GstPadDirection direction, GstCaps * caps, guint size,
79 GstCaps * othercaps, guint * othersize);
82 gst_capsfilter_base_init (gpointer g_class)
84 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
86 gst_element_class_set_details_simple (gstelement_class,
89 "Pass data without modification, limiting formats",
90 "David Schleef <ds@schleef.org>");
91 gst_element_class_add_pad_template (gstelement_class,
92 gst_static_pad_template_get (&srctemplate));
93 gst_element_class_add_pad_template (gstelement_class,
94 gst_static_pad_template_get (&sinktemplate));
98 gst_capsfilter_class_init (GstCapsFilterClass * klass)
100 GObjectClass *gobject_class;
101 GstBaseTransformClass *trans_class;
103 gobject_class = G_OBJECT_CLASS (klass);
104 gobject_class->set_property = gst_capsfilter_set_property;
105 gobject_class->get_property = gst_capsfilter_get_property;
106 gobject_class->dispose = gst_capsfilter_dispose;
108 g_object_class_install_property (gobject_class, PROP_FILTER_CAPS,
109 g_param_spec_boxed ("caps", _("Filter caps"),
110 _("Restrict the possible allowed capabilities (NULL means ANY). "
111 "Setting this property takes a reference to the supplied GstCaps "
112 "object."), GST_TYPE_CAPS,
113 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
115 trans_class = GST_BASE_TRANSFORM_CLASS (klass);
116 trans_class->transform_caps =
117 GST_DEBUG_FUNCPTR (gst_capsfilter_transform_caps);
118 trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_capsfilter_transform_ip);
119 trans_class->prepare_output_buffer =
120 GST_DEBUG_FUNCPTR (gst_capsfilter_prepare_buf);
121 trans_class->transform_size =
122 GST_DEBUG_FUNCPTR (gst_capsfilter_transform_size);
126 gst_capsfilter_init (GstCapsFilter * filter, GstCapsFilterClass * g_class)
128 GstBaseTransform *trans = GST_BASE_TRANSFORM (filter);
129 gst_base_transform_set_gap_aware (trans, TRUE);
130 filter->filter_caps = gst_caps_new_any ();
134 copy_func (GQuark field_id, const GValue * value, GstStructure * dest)
136 gst_structure_id_set_value (dest, field_id, value);
142 gst_capsfilter_set_property (GObject * object, guint prop_id,
143 const GValue * value, GParamSpec * pspec)
145 GstCapsFilter *capsfilter = GST_CAPSFILTER (object);
148 case PROP_FILTER_CAPS:{
150 GstCaps *old_caps, *suggest, *nego;
151 const GstCaps *new_caps_val = gst_value_get_caps (value);
153 if (new_caps_val == NULL) {
154 new_caps = gst_caps_new_any ();
156 new_caps = (GstCaps *) new_caps_val;
157 gst_caps_ref (new_caps);
160 GST_OBJECT_LOCK (capsfilter);
161 old_caps = capsfilter->filter_caps;
162 capsfilter->filter_caps = new_caps;
163 GST_OBJECT_UNLOCK (capsfilter);
165 gst_caps_unref (old_caps);
167 GST_DEBUG_OBJECT (capsfilter, "set new caps %" GST_PTR_FORMAT, new_caps);
169 /* filter the currently negotiated format against the new caps */
170 GST_OBJECT_LOCK (GST_BASE_TRANSFORM_SINK_PAD (object));
171 nego = GST_PAD_CAPS (GST_BASE_TRANSFORM_SINK_PAD (object));
173 GST_DEBUG_OBJECT (capsfilter, "we had negotiated caps %" GST_PTR_FORMAT,
176 if (G_UNLIKELY (gst_caps_is_any (new_caps))) {
177 GST_DEBUG_OBJECT (capsfilter, "not settings any suggestion");
181 GstStructure *s1, *s2;
183 /* first check if the name is the same */
184 s1 = gst_caps_get_structure (nego, 0);
185 s2 = gst_caps_get_structure (new_caps, 0);
187 if (gst_structure_get_name_id (s1) == gst_structure_get_name_id (s2)) {
188 /* same name, copy all fields from the new caps into the previously
190 suggest = gst_caps_copy (nego);
191 s1 = gst_caps_get_structure (suggest, 0);
192 gst_structure_foreach (s2, (GstStructureForeachFunc) copy_func, s1);
193 GST_DEBUG_OBJECT (capsfilter, "copied structure fields");
195 GST_DEBUG_OBJECT (capsfilter, "different structure names");
196 /* different names, we can only suggest the complete caps */
197 suggest = gst_caps_copy (new_caps);
201 GST_DEBUG_OBJECT (capsfilter, "no negotiated caps");
202 /* no previous caps, the getcaps function will be used to find suitable
206 GST_OBJECT_UNLOCK (GST_BASE_TRANSFORM_SINK_PAD (object));
208 GST_DEBUG_OBJECT (capsfilter, "suggesting new caps %" GST_PTR_FORMAT,
210 gst_base_transform_suggest (GST_BASE_TRANSFORM (object), suggest, 0);
212 gst_caps_unref (suggest);
217 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
223 gst_capsfilter_get_property (GObject * object, guint prop_id, GValue * value,
226 GstCapsFilter *capsfilter = GST_CAPSFILTER (object);
229 case PROP_FILTER_CAPS:
230 GST_OBJECT_LOCK (capsfilter);
231 gst_value_set_caps (value, capsfilter->filter_caps);
232 GST_OBJECT_UNLOCK (capsfilter);
235 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
241 gst_capsfilter_dispose (GObject * object)
243 GstCapsFilter *filter = GST_CAPSFILTER (object);
245 gst_caps_replace (&filter->filter_caps, NULL);
247 G_OBJECT_CLASS (parent_class)->dispose (object);
251 gst_capsfilter_transform_caps (GstBaseTransform * base,
252 GstPadDirection direction, GstCaps * caps)
254 GstCapsFilter *capsfilter = GST_CAPSFILTER (base);
255 GstCaps *ret, *filter_caps;
257 GST_OBJECT_LOCK (capsfilter);
258 filter_caps = gst_caps_ref (capsfilter->filter_caps);
259 GST_OBJECT_UNLOCK (capsfilter);
261 ret = gst_caps_intersect (caps, filter_caps);
262 GST_DEBUG_OBJECT (capsfilter, "input: %" GST_PTR_FORMAT, caps);
263 GST_DEBUG_OBJECT (capsfilter, "filter: %" GST_PTR_FORMAT, filter_caps);
264 GST_DEBUG_OBJECT (capsfilter, "intersect: %" GST_PTR_FORMAT, ret);
266 gst_caps_unref (filter_caps);
272 gst_capsfilter_transform_size (GstBaseTransform * trans,
273 GstPadDirection direction, GstCaps * caps, guint size,
274 GstCaps * othercaps, guint * othersize)
276 /* return the same size */
283 gst_capsfilter_transform_ip (GstBaseTransform * base, GstBuffer * buf)
285 /* No actual work here. It's all done in the prepare output buffer
290 /* Output buffer preparation... if the buffer has no caps, and
291 * our allowed output caps is fixed, then give the caps to the
293 * This ensures that outgoing buffers have caps if we can, so
294 * that pipelines like:
295 * gst-launch filesrc location=rawsamples.raw !
296 * audio/x-raw-int,width=16,depth=16,rate=48000,channels=2,
297 * endianness=4321,signed='(boolean)'true ! alsasink
301 gst_capsfilter_prepare_buf (GstBaseTransform * trans, GstBuffer * input,
302 gint size, GstCaps * caps, GstBuffer ** buf)
304 GstFlowReturn ret = GST_FLOW_OK;
306 if (GST_BUFFER_CAPS (input) != NULL) {
307 /* Output buffer already has caps */
308 GST_LOG_OBJECT (trans, "Input buffer already has caps (implicitely fixed)");
309 /* FIXME : Move this behaviour to basetransform. The given caps are the ones
310 * of the source pad, therefore our outgoing buffers should always have
312 if (GST_BUFFER_CAPS (input) != caps) {
313 /* caps are different, make a metadata writable output buffer to set
315 if (gst_buffer_is_metadata_writable (input)) {
316 /* input is writable, just set caps and use this as the output */
318 gst_buffer_set_caps (*buf, caps);
319 gst_buffer_ref (input);
321 GST_DEBUG_OBJECT (trans, "Creating sub-buffer and setting caps");
322 *buf = gst_buffer_create_sub (input, 0, GST_BUFFER_SIZE (input));
323 gst_buffer_set_caps (*buf, caps);
326 /* caps are right, just use a ref of the input as the outbuf */
328 gst_buffer_ref (input);
331 /* Buffer has no caps. See if the output pad only supports fixed caps */
334 out_caps = GST_PAD_CAPS (trans->srcpad);
336 if (out_caps != NULL) {
337 gst_caps_ref (out_caps);
339 out_caps = gst_pad_get_allowed_caps (trans->srcpad);
340 g_return_val_if_fail (out_caps != NULL, GST_FLOW_ERROR);
343 out_caps = gst_caps_make_writable (out_caps);
344 gst_caps_do_simplify (out_caps);
346 if (gst_caps_is_fixed (out_caps) && !gst_caps_is_empty (out_caps)) {
347 GST_DEBUG_OBJECT (trans, "Have fixed output caps %"
348 GST_PTR_FORMAT " to apply to buffer with no caps", out_caps);
349 if (gst_buffer_is_metadata_writable (input)) {
350 gst_buffer_ref (input);
353 GST_DEBUG_OBJECT (trans, "Creating sub-buffer and setting caps");
354 *buf = gst_buffer_create_sub (input, 0, GST_BUFFER_SIZE (input));
356 GST_BUFFER_CAPS (*buf) = out_caps;
358 if (GST_PAD_CAPS (trans->srcpad) == NULL)
359 gst_pad_set_caps (trans->srcpad, out_caps);
361 gchar *caps_str = gst_caps_to_string (out_caps);
363 GST_DEBUG_OBJECT (trans, "Cannot choose caps. Have unfixed output caps %"
364 GST_PTR_FORMAT, out_caps);
365 gst_caps_unref (out_caps);
367 ret = GST_FLOW_ERROR;
368 GST_ELEMENT_ERROR (trans, STREAM, FORMAT,
369 ("Filter caps do not completely specify the output format"),
370 ("Output caps are unfixed: %s", caps_str));