2 * Copyright (C) 2011 Wim Taymans <wim.taymans@gmail.com>
4 * gstsample.c: media sample
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
25 * @short_description: A media sample
26 * @see_also: #GstBuffer, #GstCaps, #GstSegment
28 * A #GstSample is a small object containing data, a type, timing and
29 * extra arbitrary information.
31 #include "gst_private.h"
33 #include "gstsample.h"
35 GST_DEBUG_CATEGORY_STATIC (gst_sample_debug);
36 #define GST_CAT_DEFAULT gst_sample_debug
40 GstMiniObject mini_object;
46 GstBufferList *buffer_list;
49 GType _gst_sample_type = 0;
51 GST_DEFINE_MINI_OBJECT_TYPE (GstSample, gst_sample);
54 _priv_gst_sample_initialize (void)
56 _gst_sample_type = gst_sample_get_type ();
58 GST_DEBUG_CATEGORY_INIT (gst_sample_debug, "sample", 0, "GstSample debug");
62 _gst_sample_copy (GstSample * sample)
66 copy = gst_sample_new (sample->buffer, sample->caps, &sample->segment,
67 (sample->info) ? gst_structure_copy (sample->info) : NULL);
69 if (sample->buffer_list) {
70 copy->buffer_list = gst_buffer_list_ref (sample->buffer_list);
71 gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (copy->buffer_list),
72 GST_MINI_OBJECT_CAST (copy));
79 _gst_sample_free (GstSample * sample)
81 GST_LOG ("free %p", sample);
84 gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (sample->buffer),
85 GST_MINI_OBJECT_CAST (sample));
86 gst_buffer_unref (sample->buffer);
90 gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (sample->caps),
91 GST_MINI_OBJECT_CAST (sample));
92 gst_caps_unref (sample->caps);
96 gst_structure_set_parent_refcount (sample->info, NULL);
97 gst_structure_free (sample->info);
99 if (sample->buffer_list) {
100 gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (sample->buffer_list),
101 GST_MINI_OBJECT_CAST (sample));
102 gst_buffer_list_unref (sample->buffer_list);
105 g_slice_free1 (sizeof (GstSample), sample);
110 * @buffer: (transfer none) (allow-none): a #GstBuffer, or %NULL
111 * @caps: (transfer none) (allow-none): a #GstCaps, or %NULL
112 * @segment: (transfer none) (allow-none): a #GstSegment, or %NULL
113 * @info: (transfer full) (allow-none): a #GstStructure, or %NULL
115 * Create a new #GstSample with the provided details.
117 * Free-function: gst_sample_unref
119 * Returns: (transfer full): the new #GstSample. gst_sample_unref()
123 gst_sample_new (GstBuffer * buffer, GstCaps * caps, const GstSegment * segment,
128 sample = g_slice_new0 (GstSample);
130 GST_LOG ("new %p", sample);
132 gst_mini_object_init (GST_MINI_OBJECT_CAST (sample), 0, _gst_sample_type,
133 (GstMiniObjectCopyFunction) _gst_sample_copy, NULL,
134 (GstMiniObjectFreeFunction) _gst_sample_free);
137 sample->buffer = gst_buffer_ref (buffer);
138 gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (sample->buffer),
139 GST_MINI_OBJECT_CAST (sample));
143 sample->caps = gst_caps_ref (caps);
144 gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (sample->caps),
145 GST_MINI_OBJECT_CAST (sample));
148 /* FIXME 2.0: initialize with GST_FORMAT_UNDEFINED by default */
150 gst_segment_copy_into (segment, &sample->segment);
152 gst_segment_init (&sample->segment, GST_FORMAT_TIME);
155 if (!gst_structure_set_parent_refcount (info,
156 &sample->mini_object.refcount))
166 gst_sample_unref (sample);
167 g_warning ("structure is already owned by another object");
173 * gst_sample_get_buffer:
174 * @sample: a #GstSample
176 * Get the buffer associated with @sample
178 * Returns: (transfer none) (nullable): the buffer of @sample or %NULL
179 * when there is no buffer. The buffer remains valid as long as
180 * @sample is valid. If you need to hold on to it for longer than
181 * that, take a ref to the buffer with gst_buffer_ref().
184 gst_sample_get_buffer (GstSample * sample)
186 g_return_val_if_fail (GST_IS_SAMPLE (sample), NULL);
188 return sample->buffer;
192 * gst_sample_get_caps:
193 * @sample: a #GstSample
195 * Get the caps associated with @sample
197 * Returns: (transfer none) (nullable): the caps of @sample or %NULL
198 * when there is no caps. The caps remain valid as long as @sample is
199 * valid. If you need to hold on to the caps for longer than that,
200 * take a ref to the caps with gst_caps_ref().
203 gst_sample_get_caps (GstSample * sample)
205 g_return_val_if_fail (GST_IS_SAMPLE (sample), NULL);
211 * gst_sample_get_segment:
212 * @sample: a #GstSample
214 * Get the segment associated with @sample
216 * Returns: (transfer none): the segment of @sample.
217 * The segment remains valid as long as @sample is valid.
220 gst_sample_get_segment (GstSample * sample)
222 g_return_val_if_fail (GST_IS_SAMPLE (sample), NULL);
224 return &sample->segment;
228 * gst_sample_get_info:
229 * @sample: a #GstSample
231 * Get extra information associated with @sample.
233 * Returns: (transfer none) (nullable): the extra info of @sample.
234 * The info remains valid as long as @sample is valid.
237 gst_sample_get_info (GstSample * sample)
239 g_return_val_if_fail (GST_IS_SAMPLE (sample), NULL);
245 * gst_sample_get_buffer_list:
246 * @sample: a #GstSample
248 * Get the buffer list associated with @sample
250 * Returns: (transfer none) (nullable): the buffer list of @sample or %NULL
251 * when there is no buffer list. The buffer list remains valid as long as
252 * @sample is valid. If you need to hold on to it for longer than
253 * that, take a ref to the buffer list with gst_mini_object_ref ().
258 gst_sample_get_buffer_list (GstSample * sample)
260 g_return_val_if_fail (GST_IS_SAMPLE (sample), NULL);
262 return sample->buffer_list;
266 * gst_sample_set_buffer_list:
267 * @sample: a #GstSample
268 * @buffer_list: a #GstBufferList
270 * Set the buffer list associated with @sample. @sample must be writable.
275 gst_sample_set_buffer_list (GstSample * sample, GstBufferList * buffer_list)
277 GstBufferList *old = NULL;
278 g_return_if_fail (GST_IS_SAMPLE (sample));
279 g_return_if_fail (gst_sample_is_writable (sample));
281 old = sample->buffer_list;
283 if (old == buffer_list)
287 sample->buffer_list = gst_buffer_list_ref (buffer_list);
288 gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (sample->buffer_list),
289 GST_MINI_OBJECT_CAST (sample));
291 sample->buffer_list = NULL;
295 gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (old),
296 GST_MINI_OBJECT_CAST (sample));
297 gst_buffer_list_unref (old);
302 * gst_sample_set_buffer:
303 * @sample: A #GstSample
304 * @buffer: (transfer none): A #GstBuffer
306 * Set the buffer associated with @sample. @sample must be writable.
311 gst_sample_set_buffer (GstSample * sample, GstBuffer * buffer)
313 GstBuffer *old = NULL;
315 g_return_if_fail (GST_IS_SAMPLE (sample));
316 g_return_if_fail (gst_sample_is_writable (sample));
318 old = sample->buffer;
324 sample->buffer = gst_buffer_ref (buffer);
325 gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (sample->buffer),
326 GST_MINI_OBJECT_CAST (sample));
328 sample->buffer = NULL;
332 gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (old),
333 GST_MINI_OBJECT_CAST (sample));
334 gst_buffer_unref (old);
339 * gst_sample_set_caps:
340 * @sample: A #GstSample
341 * @caps: (transfer none): A #GstCaps
343 * Set the caps associated with @sample. @sample must be writable.
348 gst_sample_set_caps (GstSample * sample, GstCaps * caps)
352 g_return_if_fail (GST_IS_SAMPLE (sample));
353 g_return_if_fail (gst_sample_is_writable (sample));
361 sample->caps = gst_caps_ref (caps);
362 gst_mini_object_add_parent (GST_MINI_OBJECT_CAST (sample->caps),
363 GST_MINI_OBJECT_CAST (sample));
369 gst_mini_object_remove_parent (GST_MINI_OBJECT_CAST (old),
370 GST_MINI_OBJECT_CAST (sample));
371 gst_caps_unref (old);
376 * gst_sample_set_segment:
377 * @sample: A #GstSample
378 * @segment: (transfer none): A #GstSegment
380 * Set the segment associated with @sample. @sample must be writable.
385 gst_sample_set_segment (GstSample * sample, const GstSegment * segment)
387 g_return_if_fail (GST_IS_SAMPLE (sample));
388 g_return_if_fail (gst_sample_is_writable (sample));
390 /* FIXME 2.0: initialize with GST_FORMAT_UNDEFINED by default */
392 gst_segment_copy_into (segment, &sample->segment);
394 gst_segment_init (&sample->segment, GST_FORMAT_TIME);
398 * gst_sample_set_info:
399 * @sample: A #GstSample
400 * @info: (transfer full): A #GstStructure
402 * Set the info structure associated with @sample. @sample must be writable,
403 * and @info must not have a parent set already.
408 gst_sample_set_info (GstSample * sample, GstStructure * info)
410 g_return_val_if_fail (GST_IS_SAMPLE (sample), FALSE);
411 g_return_val_if_fail (gst_sample_is_writable (sample), FALSE);
414 if (!gst_structure_set_parent_refcount (info,
415 &sample->mini_object.refcount))
420 gst_structure_set_parent_refcount (sample->info, NULL);
421 gst_structure_free (sample->info);
429 g_warning ("structure is already owned by another object");