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>
7 * gstquery.h: GstQuery API declaration
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.
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.
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., 59 Temple Place - Suite 330,
22 * Boston, MA 02111-1307, USA.
26 #ifndef __GST_QUERY_H__
27 #define __GST_QUERY_H__
31 #include <gst/gstiterator.h>
32 #include <gst/gstminiobject.h>
33 #include <gst/gststructure.h>
34 #include <gst/gstformat.h>
35 #include <gst/gstpad.h>
39 typedef struct _GstQuery GstQuery;
43 * @GST_QUERY_TYPE_UPSTREAM: Set if the query can travel upstream.
44 * @GST_QUERY_TYPE_DOWNSTREAM: Set if the query can travel downstream.
45 * @GST_QUERY_TYPE_SERIALIZED: Set if the query should be serialized with data
48 * #GstQueryTypeFlags indicate the aspects of the different #GstQueryType
49 * values. You can get the type flags of a #GstQueryType with the
50 * gst_query_type_get_flags() function.
53 GST_QUERY_TYPE_UPSTREAM = 1 << 0,
54 GST_QUERY_TYPE_DOWNSTREAM = 1 << 1,
55 GST_QUERY_TYPE_SERIALIZED = 1 << 2
59 * GST_QUERY_TYPE_BOTH:
61 * The same thing as #GST_QUERY_TYPE_UPSTREAM | #GST_QUERY_TYPE_DOWNSTREAM.
63 #define GST_QUERY_TYPE_BOTH \
64 (GST_QUERY_TYPE_UPSTREAM | GST_QUERY_TYPE_DOWNSTREAM)
66 #define GST_QUERY_NUM_SHIFT (8)
69 * GST_QUERY_MAKE_TYPE:
70 * @num: the query number to create
71 * @idx: the index in the sticky array
72 * @flags: the query flags
74 * when making custom query types, use this macro with the num and
77 #define GST_QUERY_MAKE_TYPE(num,flags) \
78 (((num) << GST_QUERY_NUM_SHIFT) | (flags))
80 #define FLAG(name) GST_QUERY_TYPE_##name
85 * @GST_QUERY_UNKNOWN: unknown query type
86 * @GST_QUERY_POSITION: current position in stream
87 * @GST_QUERY_DURATION: total duration of the stream
88 * @GST_QUERY_LATENCY: latency of stream
89 * @GST_QUERY_JITTER: current jitter of stream
90 * @GST_QUERY_RATE: current rate of the stream
91 * @GST_QUERY_SEEKING: seeking capabilities
92 * @GST_QUERY_SEGMENT: segment start/stop positions
93 * @GST_QUERY_CONVERT: convert values between formats
94 * @GST_QUERY_FORMATS: query supported formats for convert
95 * @GST_QUERY_BUFFERING: query available media for efficient seeking. Since
97 * @GST_QUERY_CUSTOM: a custom application or element defined query. Since
99 * @GST_QUERY_URI: query the URI of the source or sink. Since 0.10.22.
100 * @GST_QUERY_ALLOCATION: the buffer allocation properties
101 * @GST_QUERY_SCHEDULING: the scheduling properties
102 * @GST_QUERY_ACCEPT_CAPS: the accept caps query
103 * @GST_QUERY_CAPS: the caps query
105 * Standard predefined Query types
107 /* NOTE: don't forget to update the table in gstquery.c when changing
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))
130 #define GST_TYPE_QUERY (gst_query_get_type())
131 #define GST_IS_QUERY(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_QUERY))
132 #define GST_QUERY_CAST(obj) ((GstQuery*)(obj))
133 #define GST_QUERY(obj) (GST_QUERY_CAST(obj))
137 * @query: the query to query
139 * Get the #GstQueryType of the query.
141 #define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type)
144 * GST_QUERY_TYPE_NAME:
145 * @query: the query to query
147 * Get a constant string representation of the #GstQueryType of the query.
151 #define GST_QUERY_TYPE_NAME(query) (gst_query_type_get_name(GST_QUERY_TYPE(query)))
154 * GST_QUERY_IS_UPSTREAM:
155 * @ev: the query to query
157 * Check if an query can travel upstream.
159 #define GST_QUERY_IS_UPSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_UPSTREAM)
161 * GST_QUERY_IS_DOWNSTREAM:
162 * @ev: the query to query
164 * Check if an query can travel downstream.
166 #define GST_QUERY_IS_DOWNSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_DOWNSTREAM)
168 * GST_QUERY_IS_SERIALIZED:
169 * @ev: the query to query
171 * Check if an query is serialized with the data stream.
173 #define GST_QUERY_IS_SERIALIZED(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_SERIALIZED)
178 * @mini_object: The parent #GstMiniObject type
179 * @type: the #GstQueryType
181 * The #GstQuery structure.
185 GstMiniObject mini_object;
187 /*< public > *//* with COW */
191 const gchar* gst_query_type_get_name (GstQueryType type);
192 GQuark gst_query_type_to_quark (GstQueryType type);
194 gst_query_type_get_flags (GstQueryType type);
197 GType gst_query_get_type (void);
202 * @q: a #GstQuery to increase the refcount of.
204 * Increases the refcount of the given query by one.
208 #ifdef _FOOL_GTK_DOC_
209 G_INLINE_FUNC GstQuery * gst_query_ref (GstQuery * q);
212 static inline GstQuery *
213 gst_query_ref (GstQuery * q)
215 return GST_QUERY_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (q)));
220 * @q: a #GstQuery to decrease the refcount of.
222 * Decreases the refcount of the query. If the refcount reaches 0, the query
225 #ifdef _FOOL_GTK_DOC_
226 G_INLINE_FUNC void gst_query_unref (GstQuery * q);
230 gst_query_unref (GstQuery * q)
232 gst_mini_object_unref (GST_MINI_OBJECT_CAST (q));
238 * @q: a #GstQuery to copy.
240 * Copies the given query using the copy function of the parent #GstStructure.
242 * Free-function: gst_query_unref
244 * Returns: (transfer full): a new copy of @q.
246 #ifdef _FOOL_GTK_DOC_
247 G_INLINE_FUNC GstQuery * gst_query_copy (const GstQuery * q);
250 static inline GstQuery *
251 gst_query_copy (const GstQuery * q)
253 return GST_QUERY_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (q)));
257 * gst_query_is_writable:
260 * Tests if you can safely write data into a query's structure.
262 #define gst_query_is_writable(q) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (q))
264 * gst_query_make_writable:
265 * @q: (transfer full): a #GstQuery to make writable
267 * Makes a writable query from the given query.
269 * Returns: (transfer full): a new writable query (possibly same as @q)
271 #define gst_query_make_writable(q) GST_QUERY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (q)))
274 * @old_query: (inout) (transfer full): pointer to a pointer to a #GstQuery
276 * @new_query: (allow-none) (transfer none): pointer to a #GstQuery that will
277 * replace the query pointed to by @old_query.
279 * Modifies a pointer to a #GstQuery to point to a different #GstQuery. The
280 * modification is done atomically (so this is useful for ensuring thread safety
281 * in some cases), and the reference counts are updated appropriately (the old
282 * query is unreffed, the new one is reffed).
284 * Either @new_query or the #GstQuery pointed to by @old_query may be NULL.
286 * Returns: TRUE if @new_query was different from @old_query
288 #ifdef _FOOL_GTK_DOC_
289 G_INLINE_FUNC gboolean gst_query_replace (GstQuery **old_query, GstQuery *new_query);
292 static inline gboolean
293 gst_query_replace (GstQuery **old_query, GstQuery *new_query)
295 return gst_mini_object_replace ((GstMiniObject **) old_query, (GstMiniObject *) new_query);
298 /* application specific query */
299 GstQuery * gst_query_new_custom (GstQueryType type, GstStructure *structure) G_GNUC_MALLOC;
301 gst_query_get_structure (GstQuery *query);
302 GstStructure * gst_query_writable_structure (GstQuery *query);
305 GstQuery* gst_query_new_position (GstFormat format) G_GNUC_MALLOC;
306 void gst_query_set_position (GstQuery *query, GstFormat format, gint64 cur);
307 void gst_query_parse_position (GstQuery *query, GstFormat *format, gint64 *cur);
310 GstQuery* gst_query_new_duration (GstFormat format) G_GNUC_MALLOC;
311 void gst_query_set_duration (GstQuery *query, GstFormat format, gint64 duration);
312 void gst_query_parse_duration (GstQuery *query, GstFormat *format, gint64 *duration);
315 GstQuery* gst_query_new_latency (void) G_GNUC_MALLOC;
316 void gst_query_set_latency (GstQuery *query, gboolean live, GstClockTime min_latency,
317 GstClockTime max_latency);
318 void gst_query_parse_latency (GstQuery *query, gboolean *live, GstClockTime *min_latency,
319 GstClockTime *max_latency);
322 GstQuery* gst_query_new_convert (GstFormat src_format, gint64 value, GstFormat dest_format) G_GNUC_MALLOC;
323 void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value,
324 GstFormat dest_format, gint64 dest_value);
325 void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value,
326 GstFormat *dest_format, gint64 *dest_value);
328 GstQuery* gst_query_new_segment (GstFormat format) G_GNUC_MALLOC;
329 void gst_query_set_segment (GstQuery *query, gdouble rate, GstFormat format,
330 gint64 start_value, gint64 stop_value);
331 void gst_query_parse_segment (GstQuery *query, gdouble *rate, GstFormat *format,
332 gint64 *start_value, gint64 *stop_value);
335 GstQuery* gst_query_new_seeking (GstFormat format) G_GNUC_MALLOC;
336 void gst_query_set_seeking (GstQuery *query, GstFormat format,
338 gint64 segment_start,
340 void gst_query_parse_seeking (GstQuery *query, GstFormat *format,
342 gint64 *segment_start,
343 gint64 *segment_end);
345 GstQuery* gst_query_new_formats (void) G_GNUC_MALLOC;
346 void gst_query_set_formats (GstQuery *query, gint n_formats, ...);
347 void gst_query_set_formatsv (GstQuery *query, gint n_formats, const GstFormat *formats);
348 void gst_query_parse_n_formats (GstQuery *query, guint *n_formats);
349 void gst_query_parse_nth_format (GstQuery *query, guint nth, GstFormat *format);
351 /* buffering query */
354 * @GST_BUFFERING_STREAM: a small amount of data is buffered
355 * @GST_BUFFERING_DOWNLOAD: the stream is being downloaded
356 * @GST_BUFFERING_TIMESHIFT: the stream is being downloaded in a ringbuffer
357 * @GST_BUFFERING_LIVE: the stream is a live stream
359 * The different types of buffering methods.
362 GST_BUFFERING_STREAM,
363 GST_BUFFERING_DOWNLOAD,
364 GST_BUFFERING_TIMESHIFT,
368 GstQuery* gst_query_new_buffering (GstFormat format) G_GNUC_MALLOC;
369 void gst_query_set_buffering_percent (GstQuery *query, gboolean busy, gint percent);
370 void gst_query_parse_buffering_percent (GstQuery *query, gboolean *busy, gint *percent);
372 void gst_query_set_buffering_stats (GstQuery *query, GstBufferingMode mode,
373 gint avg_in, gint avg_out,
374 gint64 buffering_left);
375 void gst_query_parse_buffering_stats (GstQuery *query, GstBufferingMode *mode,
376 gint *avg_in, gint *avg_out,
377 gint64 *buffering_left);
379 void gst_query_set_buffering_range (GstQuery *query, GstFormat format,
380 gint64 start, gint64 stop,
381 gint64 estimated_total);
382 void gst_query_parse_buffering_range (GstQuery *query, GstFormat *format,
383 gint64 *start, gint64 *stop,
384 gint64 *estimated_total);
386 gboolean gst_query_add_buffering_range (GstQuery *query,
387 gint64 start, gint64 stop);
388 guint gst_query_get_n_buffering_ranges (GstQuery *query);
389 gboolean gst_query_parse_nth_buffering_range (GstQuery *query,
390 guint index, gint64 *start,
394 GstQuery * gst_query_new_uri (void) G_GNUC_MALLOC;
395 void gst_query_parse_uri (GstQuery *query, gchar **uri);
396 void gst_query_set_uri (GstQuery *query, const gchar *uri);
398 /* allocation query */
399 GstQuery * gst_query_new_allocation (GstCaps *caps, gboolean need_pool) G_GNUC_MALLOC;
400 void gst_query_parse_allocation (GstQuery *query, GstCaps **caps, gboolean *need_pool);
402 void gst_query_set_allocation_params (GstQuery *query, guint size, guint min_buffers,
403 guint max_buffers, guint prefix, guint alignment,
404 GstBufferPool *pool);
405 void gst_query_parse_allocation_params (GstQuery *query, guint *size, guint *min_buffers,
406 guint *max_buffers, guint *prefix, guint *alignment,
407 GstBufferPool **pool);
409 void gst_query_add_allocation_meta (GstQuery *query, GType api);
410 guint gst_query_get_n_allocation_metas (GstQuery *query);
411 GType gst_query_parse_nth_allocation_meta (GstQuery *query, guint index);
412 void gst_query_remove_nth_allocation_meta (GstQuery *query, guint index);
413 gboolean gst_query_has_allocation_meta (GstQuery *query, GType api);
415 void gst_query_add_allocation_memory (GstQuery *query, GstAllocator *allocator);
416 guint gst_query_get_n_allocation_memories (GstQuery *query);
417 GstAllocator * gst_query_parse_nth_allocation_memory (GstQuery *query, guint index);
419 /* scheduling query */
421 * GstSchedulingFlags:
422 * @GST_SCHEDULING_FLAG_SEEKABLE: if seeking is possible
423 * @GST_SCHEDULING_FLAG_SEQUENTIAL: if sequential access is recommended
425 * The different scheduling flags.
428 GST_SCHEDULING_FLAG_SEEKABLE = (1 << 0),
429 GST_SCHEDULING_FLAG_SEQUENTIAL = (1 << 1)
430 } GstSchedulingFlags;
432 GstQuery * gst_query_new_scheduling (void) G_GNUC_MALLOC;
434 void gst_query_set_scheduling (GstQuery *query, GstSchedulingFlags flags,
435 gint minsize, gint maxsize, gint align);
436 void gst_query_parse_scheduling (GstQuery *query, GstSchedulingFlags *flags,
437 gint *minsize, gint *maxsize, gint *align);
439 void gst_query_add_scheduling_mode (GstQuery *query, GstPadMode mode);
440 guint gst_query_get_n_scheduling_modes (GstQuery *query);
441 GstPadMode gst_query_parse_nth_scheduling_mode (GstQuery *query, guint index);
442 gboolean gst_query_has_scheduling_mode (GstQuery *query, GstPadMode mode);
444 /* accept-caps query */
445 GstQuery * gst_query_new_accept_caps (GstCaps *caps) G_GNUC_MALLOC;
446 void gst_query_parse_accept_caps (GstQuery *query, GstCaps **caps);
447 void gst_query_set_accept_caps_result (GstQuery *query, gboolean result);
448 void gst_query_parse_accept_caps_result (GstQuery *query, gboolean *result);
451 GstQuery * gst_query_new_caps (GstCaps *filter) G_GNUC_MALLOC;
452 void gst_query_parse_caps (GstQuery *query, GstCaps **filter);
454 void gst_query_set_caps_result (GstQuery *query, GstCaps *caps);
455 void gst_query_parse_caps_result (GstQuery *query, GstCaps **caps);
457 void gst_query_intersect_caps_result (GstQuery *query, GstCaps *filter,
458 GstCapsIntersectMode mode);
462 #endif /* __GST_QUERY_H__ */