1/* GStreamer
2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wim.taymans@chello.be>
4 * 2005 Wim Taymans <wim@fluendo.com>
5 * 2011 Wim Taymans <wim.taymans@gmail.com>
6 *
7 * gstquery.h: GstQuery API declaration
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
18 *
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
23 */
24
25
26#ifndef __GST_QUERY_H__
27#define __GST_QUERY_H__
28
29#include <glib.h>
30#include <glib-object.h>
31#include <gst/gstconfig.h>
32
33G_BEGIN_DECLS
34
35typedef struct _GstQuery GstQuery;
36
37#include <gst/gstminiobject.h>
38
39/**
40 * GstQueryTypeFlags:
41 * @GST_QUERY_TYPE_UPSTREAM: Set if the query can travel upstream.
42 * @GST_QUERY_TYPE_DOWNSTREAM: Set if the query can travel downstream.
43 * @GST_QUERY_TYPE_SERIALIZED: Set if the query should be serialized with data
44 * flow.
45 *
46 * #GstQueryTypeFlags indicate the aspects of the different #GstQueryType
47 * values. You can get the type flags of a #GstQueryType with the
48 * gst_query_type_get_flags() function.
49 */
50typedef enum {
51 GST_QUERY_TYPE_UPSTREAM = 1 << 0,
52 GST_QUERY_TYPE_DOWNSTREAM = 1 << 1,
53 GST_QUERY_TYPE_SERIALIZED = 1 << 2
54} GstQueryTypeFlags;
55
56/**
57 * GST_QUERY_TYPE_BOTH: (value 3) (type GstQueryTypeFlags)
58 *
59 * The same thing as #GST_QUERY_TYPE_UPSTREAM | #GST_QUERY_TYPE_DOWNSTREAM.
60 */
61#define GST_QUERY_TYPE_BOTH \
62 ((GstQueryTypeFlags)(GST_QUERY_TYPE_UPSTREAM | GST_QUERY_TYPE_DOWNSTREAM))
63
64#define GST_QUERY_NUM_SHIFT (8)
65
66/**
67 * GST_QUERY_MAKE_TYPE:
68 * @num: the query number to create
69 * @flags: the query flags
70 *
71 * when making custom query types, use this macro with the num and
72 * the given flags
73 */
74#define GST_QUERY_MAKE_TYPE(num,flags) \
75 (((num) << GST_QUERY_NUM_SHIFT) | (flags))
76
77#define _FLAG(name) GST_QUERY_TYPE_##name
78
79
80/**
81 * GstQueryType:
82 * @GST_QUERY_UNKNOWN: unknown query type
83 * @GST_QUERY_POSITION: current position in stream
84 * @GST_QUERY_DURATION: total duration of the stream
85 * @GST_QUERY_LATENCY: latency of stream
86 * @GST_QUERY_JITTER: current jitter of stream
87 * @GST_QUERY_RATE: current rate of the stream
88 * @GST_QUERY_SEEKING: seeking capabilities
89 * @GST_QUERY_SEGMENT: segment start/stop positions
90 * @GST_QUERY_CONVERT: convert values between formats
91 * @GST_QUERY_FORMATS: query supported formats for convert
92 * @GST_QUERY_BUFFERING: query available media for efficient seeking.
93 * @GST_QUERY_CUSTOM: a custom application or element defined query.
94 * @GST_QUERY_URI: query the URI of the source or sink.
95 * @GST_QUERY_ALLOCATION: the buffer allocation properties
96 * @GST_QUERY_SCHEDULING: the scheduling properties
97 * @GST_QUERY_ACCEPT_CAPS: the accept caps query
98 * @GST_QUERY_CAPS: the caps query
99 * @GST_QUERY_DRAIN: wait till all serialized data is consumed downstream
100 * @GST_QUERY_CONTEXT: query the pipeline-local context from
101 * downstream or upstream (since 1.2)
102 * @GST_QUERY_BITRATE: the bitrate query (since 1.16)
103 * @GST_QUERY_SELECTABLE: Query stream selection capability (Since: 1.22)
104 *
105 * Standard predefined Query types
106 */
107/* NOTE: don't forget to update the table in gstquery.c when changing
108 * this enum */
109typedef enum {
110 GST_QUERY_UNKNOWN = GST_QUERY_MAKE_TYPE (0, 0),
111 GST_QUERY_POSITION = GST_QUERY_MAKE_TYPE (10, _FLAG(BOTH)),
112 GST_QUERY_DURATION = GST_QUERY_MAKE_TYPE (20, _FLAG(BOTH)),
113 GST_QUERY_LATENCY = GST_QUERY_MAKE_TYPE (30, _FLAG(BOTH)),
114 GST_QUERY_JITTER = GST_QUERY_MAKE_TYPE (40, _FLAG(BOTH)),
115 GST_QUERY_RATE = GST_QUERY_MAKE_TYPE (50, _FLAG(BOTH)),
116 GST_QUERY_SEEKING = GST_QUERY_MAKE_TYPE (60, _FLAG(BOTH)),
117 GST_QUERY_SEGMENT = GST_QUERY_MAKE_TYPE (70, _FLAG(BOTH)),
118 GST_QUERY_CONVERT = GST_QUERY_MAKE_TYPE (80, _FLAG(BOTH)),
119 GST_QUERY_FORMATS = GST_QUERY_MAKE_TYPE (90, _FLAG(BOTH)),
120 GST_QUERY_BUFFERING = GST_QUERY_MAKE_TYPE (110, _FLAG(BOTH)),
121 GST_QUERY_CUSTOM = GST_QUERY_MAKE_TYPE (120, _FLAG(BOTH)),
122 GST_QUERY_URI = GST_QUERY_MAKE_TYPE (130, _FLAG(BOTH)),
123 GST_QUERY_ALLOCATION = GST_QUERY_MAKE_TYPE (140, _FLAG(DOWNSTREAM) | _FLAG(SERIALIZED)),
124 GST_QUERY_SCHEDULING = GST_QUERY_MAKE_TYPE (150, _FLAG(UPSTREAM)),
125 GST_QUERY_ACCEPT_CAPS = GST_QUERY_MAKE_TYPE (160, _FLAG(BOTH)),
126 GST_QUERY_CAPS = GST_QUERY_MAKE_TYPE (170, _FLAG(BOTH)),
127 GST_QUERY_DRAIN = GST_QUERY_MAKE_TYPE (180, _FLAG(DOWNSTREAM) | _FLAG(SERIALIZED)),
128 GST_QUERY_CONTEXT = GST_QUERY_MAKE_TYPE (190, _FLAG(BOTH)),
129 GST_QUERY_BITRATE = GST_QUERY_MAKE_TYPE (200, _FLAG(DOWNSTREAM)),
130
131 /**
132 * GST_QUERY_SELECTABLE:
133 *
134 * Query stream selection capability.
135 *
136 * Since: 1.22
137 */
138 GST_QUERY_SELECTABLE = GST_QUERY_MAKE_TYPE (210, _FLAG(BOTH)),
139} GstQueryType;
140#undef _FLAG
141
142GST_API GType _gst_query_type;
143
144#define GST_TYPE_QUERY (_gst_query_type)
145#define GST_IS_QUERY(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_QUERY))
146#define GST_QUERY_CAST(obj) ((GstQuery*)(obj))
147#define GST_QUERY(obj) (GST_QUERY_CAST(obj))
148
149/**
150 * GST_QUERY_TYPE:
151 * @query: the query to query
152 *
153 * Get the #GstQueryType of the query.
154 */
155#define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type)
156
157/**
158 * GST_QUERY_TYPE_NAME:
159 * @query: the query to query
160 *
161 * Get a constant string representation of the #GstQueryType of the query.
162 */
163#define GST_QUERY_TYPE_NAME(query) (gst_query_type_get_name(GST_QUERY_TYPE(query)))
164
165/**
166 * GST_QUERY_IS_UPSTREAM:
167 * @ev: the query to query
168 *
169 * Check if an query can travel upstream.
170 */
171#define GST_QUERY_IS_UPSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_UPSTREAM)
172/**
173 * GST_QUERY_IS_DOWNSTREAM:
174 * @ev: the query to query
175 *
176 * Check if an query can travel downstream.
177 */
178#define GST_QUERY_IS_DOWNSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_DOWNSTREAM)
179/**
180 * GST_QUERY_IS_SERIALIZED:
181 * @ev: the query to query
182 *
183 * Check if an query is serialized with the data stream.
184 */
185#define GST_QUERY_IS_SERIALIZED(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_SERIALIZED)
186
187
188/**
189 * GstQuery:
190 * @mini_object: The parent #GstMiniObject type
191 * @type: the #GstQueryType
192 *
193 * The #GstQuery structure.
194 */
195struct _GstQuery
196{
197 GstMiniObject mini_object;
198
199 /*< public > *//* with COW */
200 GstQueryType type;
201};
202
203/**
204 * GstBufferingMode:
205 * @GST_BUFFERING_STREAM: a small amount of data is buffered
206 * @GST_BUFFERING_DOWNLOAD: the stream is being downloaded
207 * @GST_BUFFERING_TIMESHIFT: the stream is being downloaded in a ringbuffer
208 * @GST_BUFFERING_LIVE: the stream is a live stream
209 *
210 * The different types of buffering methods.
211 */
212typedef enum {
213 GST_BUFFERING_STREAM,
214 GST_BUFFERING_DOWNLOAD,
215 GST_BUFFERING_TIMESHIFT,
216 GST_BUFFERING_LIVE
217} GstBufferingMode;
218
219#include <gst/gstiterator.h>
220#include <gst/gststructure.h>
221#include <gst/gstformat.h>
222#include <gst/gstpad.h>
223#include <gst/gstallocator.h>
224#include <gst/gsttoc.h>
225#include <gst/gstcontext.h>
226
227GST_API
228const gchar* gst_query_type_get_name (GstQueryType type);
229
230GST_API
231GQuark gst_query_type_to_quark (GstQueryType type);
232
233GST_API
234GstQueryTypeFlags
235 gst_query_type_get_flags (GstQueryType type);
236
237
238GST_API
239GType gst_query_get_type (void);
240
241#ifndef GST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS
242/* refcounting */
243static inline GstQuery *
244gst_query_ref (GstQuery * q)
245{
246 return GST_QUERY_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (q)));
247}
248
249static inline void
250gst_query_unref (GstQuery * q)
251{
252 gst_mini_object_unref (GST_MINI_OBJECT_CAST (q));
253}
254
255static inline void
256gst_clear_query (GstQuery ** query_ptr)
257{
258 gst_clear_mini_object ((GstMiniObject **) query_ptr);
259}
260
261/* copy query */
262static inline GstQuery *
263gst_query_copy (const GstQuery * q)
264{
265 return GST_QUERY_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (q)));
266}
267#else /* GST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS */
268GST_API
269GstQuery * gst_query_ref (GstQuery * q);
270
271GST_API
272void gst_query_unref (GstQuery * q);
273
274GST_API
275void gst_clear_query (GstQuery ** query_ptr);
276
277GST_API
278GstQuery * gst_query_copy (const GstQuery * q);
279#endif /* GST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS */
280
281/**
282 * gst_query_is_writable:
283 * @q: a #GstQuery
284 *
285 * Tests if you can safely write data into a query's structure.
286 */
287#define gst_query_is_writable(q) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (q))
288/**
289 * gst_query_make_writable:
290 * @q: (transfer full): a #GstQuery to make writable
291 *
292 * Makes a writable query from the given query.
293 *
294 * Returns: (transfer full): a new writable query (possibly same as @q)
295 */
296#define gst_query_make_writable(q) GST_QUERY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (q)))
297
298#ifndef GST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS
299static inline gboolean
300gst_query_replace (GstQuery **old_query, GstQuery *new_query)
301{
302 return gst_mini_object_replace (olddata: (GstMiniObject **) old_query, newdata: (GstMiniObject *) new_query);
303}
304
305static inline gboolean
306gst_query_take (GstQuery **old_query, GstQuery *new_query)
307{
308 return gst_mini_object_take (olddata: (GstMiniObject **) old_query,
309 newdata: (GstMiniObject *) new_query);
310}
311#else /* GST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS */
312GST_API
313gboolean gst_query_replace (GstQuery ** old_query,
314 GstQuery * new_query);
315
316GST_API
317gboolean gst_query_take (GstQuery ** old_query,
318 GstQuery * new_query);
319#endif /* GST_DISABLE_MINIOBJECT_INLINE_FUNCTIONS */
320
321/* application specific query */
322
323GST_API
324GstQuery * gst_query_new_custom (GstQueryType type, GstStructure *structure) G_GNUC_MALLOC;
325
326GST_API
327const GstStructure *
328 gst_query_get_structure (GstQuery *query);
329
330GST_API
331GstStructure * gst_query_writable_structure (GstQuery *query);
332
333/* position query */
334
335GST_API
336GstQuery* gst_query_new_position (GstFormat format) G_GNUC_MALLOC;
337
338GST_API
339void gst_query_set_position (GstQuery *query, GstFormat format, gint64 cur);
340
341GST_API
342void gst_query_parse_position (GstQuery *query, GstFormat *format, gint64 *cur);
343
344/* duration query */
345
346GST_API
347GstQuery* gst_query_new_duration (GstFormat format) G_GNUC_MALLOC;
348
349GST_API
350void gst_query_set_duration (GstQuery *query, GstFormat format, gint64 duration);
351
352GST_API
353void gst_query_parse_duration (GstQuery *query, GstFormat *format, gint64 *duration);
354
355/* latency query */
356
357GST_API
358GstQuery* gst_query_new_latency (void) G_GNUC_MALLOC;
359
360GST_API
361void gst_query_set_latency (GstQuery *query, gboolean live, GstClockTime min_latency,
362 GstClockTime max_latency);
363
364GST_API
365void gst_query_parse_latency (GstQuery *query, gboolean *live, GstClockTime *min_latency,
366 GstClockTime *max_latency);
367
368/* convert query */
369
370GST_API
371GstQuery* gst_query_new_convert (GstFormat src_format, gint64 value, GstFormat dest_format) G_GNUC_MALLOC;
372
373GST_API
374void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value,
375 GstFormat dest_format, gint64 dest_value);
376
377GST_API
378void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value,
379 GstFormat *dest_format, gint64 *dest_value);
380/* segment query */
381
382GST_API
383GstQuery* gst_query_new_segment (GstFormat format) G_GNUC_MALLOC;
384
385GST_API
386void gst_query_set_segment (GstQuery *query, gdouble rate, GstFormat format,
387 gint64 start_value, gint64 stop_value);
388
389GST_API
390void gst_query_parse_segment (GstQuery *query, gdouble *rate, GstFormat *format,
391 gint64 *start_value, gint64 *stop_value);
392
393/* seeking query */
394
395GST_API
396GstQuery* gst_query_new_seeking (GstFormat format) G_GNUC_MALLOC;
397
398GST_API
399void gst_query_set_seeking (GstQuery *query, GstFormat format,
400 gboolean seekable,
401 gint64 segment_start,
402 gint64 segment_end);
403
404GST_API
405void gst_query_parse_seeking (GstQuery *query, GstFormat *format,
406 gboolean *seekable,
407 gint64 *segment_start,
408 gint64 *segment_end);
409/* formats query */
410
411GST_API
412GstQuery* gst_query_new_formats (void) G_GNUC_MALLOC;
413
414GST_API
415void gst_query_set_formats (GstQuery *query, gint n_formats, ...);
416
417GST_API
418void gst_query_set_formatsv (GstQuery *query, gint n_formats, const GstFormat *formats);
419
420GST_API
421void gst_query_parse_n_formats (GstQuery *query, guint *n_formats);
422
423GST_API
424void gst_query_parse_nth_format (GstQuery *query, guint nth, GstFormat *format);
425
426/* buffering query */
427
428GST_API
429GstQuery* gst_query_new_buffering (GstFormat format) G_GNUC_MALLOC;
430
431GST_API
432void gst_query_set_buffering_percent (GstQuery *query, gboolean busy, gint percent);
433
434GST_API
435void gst_query_parse_buffering_percent (GstQuery *query, gboolean *busy, gint *percent);
436
437GST_API
438void gst_query_set_buffering_stats (GstQuery *query, GstBufferingMode mode,
439 gint avg_in, gint avg_out,
440 gint64 buffering_left);
441
442GST_API
443void gst_query_parse_buffering_stats (GstQuery *query, GstBufferingMode *mode,
444 gint *avg_in, gint *avg_out,
445 gint64 *buffering_left);
446
447GST_API
448void gst_query_set_buffering_range (GstQuery *query, GstFormat format,
449 gint64 start, gint64 stop,
450 gint64 estimated_total);
451
452GST_API
453void gst_query_parse_buffering_range (GstQuery *query, GstFormat *format,
454 gint64 *start, gint64 *stop,
455 gint64 *estimated_total);
456
457GST_API
458gboolean gst_query_add_buffering_range (GstQuery *query,
459 gint64 start, gint64 stop);
460
461GST_API
462guint gst_query_get_n_buffering_ranges (GstQuery *query);
463
464GST_API
465gboolean gst_query_parse_nth_buffering_range (GstQuery *query,
466 guint index, gint64 *start,
467 gint64 *stop);
468
469/* URI query */
470
471GST_API
472GstQuery * gst_query_new_uri (void) G_GNUC_MALLOC;
473
474GST_API
475void gst_query_parse_uri (GstQuery *query, gchar **uri);
476
477GST_API
478void gst_query_set_uri (GstQuery *query, const gchar *uri);
479
480GST_API
481void gst_query_parse_uri_redirection (GstQuery *query, gchar **uri);
482
483GST_API
484void gst_query_set_uri_redirection (GstQuery *query, const gchar *uri);
485
486GST_API
487void gst_query_parse_uri_redirection_permanent (GstQuery *query, gboolean * permanent);
488
489GST_API
490void gst_query_set_uri_redirection_permanent (GstQuery *query, gboolean permanent);
491
492/* allocation query */
493
494GST_API
495GstQuery * gst_query_new_allocation (GstCaps *caps, gboolean need_pool) G_GNUC_MALLOC;
496
497GST_API
498void gst_query_parse_allocation (GstQuery *query, GstCaps **caps, gboolean *need_pool);
499
500/* pools */
501
502GST_API
503void gst_query_add_allocation_pool (GstQuery *query, GstBufferPool *pool,
504 guint size, guint min_buffers,
505 guint max_buffers);
506
507GST_API
508guint gst_query_get_n_allocation_pools (GstQuery *query);
509
510GST_API
511void gst_query_parse_nth_allocation_pool (GstQuery *query, guint index,
512 GstBufferPool **pool,
513 guint *size, guint *min_buffers,
514 guint *max_buffers);
515
516GST_API
517void gst_query_set_nth_allocation_pool (GstQuery *query, guint index,
518 GstBufferPool *pool,
519 guint size, guint min_buffers,
520 guint max_buffers);
521
522GST_API
523void gst_query_remove_nth_allocation_pool (GstQuery *query, guint index);
524
525/* allocators */
526
527GST_API
528void gst_query_add_allocation_param (GstQuery *query, GstAllocator *allocator,
529 const GstAllocationParams *params);
530
531GST_API
532guint gst_query_get_n_allocation_params (GstQuery *query);
533
534GST_API
535void gst_query_parse_nth_allocation_param (GstQuery *query, guint index,
536 GstAllocator **allocator,
537 GstAllocationParams *params);
538
539GST_API
540void gst_query_set_nth_allocation_param (GstQuery *query, guint index,
541 GstAllocator *allocator,
542 const GstAllocationParams *params);
543
544GST_API
545void gst_query_remove_nth_allocation_param (GstQuery *query, guint index);
546
547/* metadata */
548
549GST_API
550void gst_query_add_allocation_meta (GstQuery *query, GType api, const GstStructure *params);
551
552GST_API
553guint gst_query_get_n_allocation_metas (GstQuery *query);
554
555GST_API
556GType gst_query_parse_nth_allocation_meta (GstQuery *query, guint index,
557 const GstStructure **params);
558
559GST_API
560void gst_query_remove_nth_allocation_meta (GstQuery *query, guint index);
561
562GST_API
563gboolean gst_query_find_allocation_meta (GstQuery *query, GType api, guint *index);
564
565
566/* scheduling query */
567/**
568 * GstSchedulingFlags:
569 * @GST_SCHEDULING_FLAG_SEEKABLE: if seeking is possible
570 * @GST_SCHEDULING_FLAG_SEQUENTIAL: if sequential access is recommended
571 * @GST_SCHEDULING_FLAG_BANDWIDTH_LIMITED: if bandwidth is limited and buffering possible (since 1.2)
572 *
573 * The different scheduling flags.
574 */
575typedef enum {
576 GST_SCHEDULING_FLAG_SEEKABLE = (1 << 0),
577 GST_SCHEDULING_FLAG_SEQUENTIAL = (1 << 1),
578 GST_SCHEDULING_FLAG_BANDWIDTH_LIMITED = (1 << 2)
579} GstSchedulingFlags;
580
581GST_API
582GstQuery * gst_query_new_scheduling (void) G_GNUC_MALLOC;
583
584GST_API
585void gst_query_set_scheduling (GstQuery *query, GstSchedulingFlags flags,
586 gint minsize, gint maxsize, gint align);
587
588GST_API
589void gst_query_parse_scheduling (GstQuery *query, GstSchedulingFlags *flags,
590 gint *minsize, gint *maxsize, gint *align);
591
592GST_API
593void gst_query_add_scheduling_mode (GstQuery *query, GstPadMode mode);
594
595GST_API
596guint gst_query_get_n_scheduling_modes (GstQuery *query);
597
598GST_API
599GstPadMode gst_query_parse_nth_scheduling_mode (GstQuery *query, guint index);
600
601GST_API
602gboolean gst_query_has_scheduling_mode (GstQuery *query, GstPadMode mode);
603
604GST_API
605gboolean gst_query_has_scheduling_mode_with_flags (GstQuery * query, GstPadMode mode,
606 GstSchedulingFlags flags);
607
608/* accept-caps query */
609
610GST_API
611GstQuery * gst_query_new_accept_caps (GstCaps *caps) G_GNUC_MALLOC;
612
613GST_API
614void gst_query_parse_accept_caps (GstQuery *query, GstCaps **caps);
615
616GST_API
617void gst_query_set_accept_caps_result (GstQuery *query, gboolean result);
618
619GST_API
620void gst_query_parse_accept_caps_result (GstQuery *query, gboolean *result);
621
622/* caps query */
623
624GST_API
625GstQuery * gst_query_new_caps (GstCaps *filter) G_GNUC_MALLOC;
626
627GST_API
628void gst_query_parse_caps (GstQuery *query, GstCaps **filter);
629
630GST_API
631void gst_query_set_caps_result (GstQuery *query, GstCaps *caps);
632
633GST_API
634void gst_query_parse_caps_result (GstQuery *query, GstCaps **caps);
635
636/* drain query */
637
638GST_API
639GstQuery * gst_query_new_drain (void) G_GNUC_MALLOC;
640
641/* context query */
642
643GST_API
644GstQuery * gst_query_new_context (const gchar * context_type) G_GNUC_MALLOC;
645
646GST_API
647gboolean gst_query_parse_context_type (GstQuery * query, const gchar ** context_type);
648
649GST_API
650void gst_query_set_context (GstQuery *query, GstContext *context);
651
652GST_API
653void gst_query_parse_context (GstQuery *query, GstContext **context);
654
655/* bitrate query */
656
657GST_API
658GstQuery * gst_query_new_bitrate (void) G_GNUC_MALLOC;
659
660GST_API
661void gst_query_set_bitrate (GstQuery * query, guint nominal_bitrate);
662
663GST_API
664void gst_query_parse_bitrate (GstQuery * query, guint * nominal_bitrate);
665
666/* selectable query */
667
668GST_API
669GstQuery * gst_query_new_selectable (void) G_GNUC_MALLOC;
670
671GST_API
672void gst_query_set_selectable (GstQuery *query, gboolean selectable);
673
674GST_API
675void gst_query_parse_selectable (GstQuery *query, gboolean * selectable);
676
677G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstQuery, gst_query_unref)
678
679G_END_DECLS
680
681#endif /* __GST_QUERY_H__ */
682
683

source code of include/gstreamer-1.0/gst/gstquery.h