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>
6 * gstquery.c: GstQueryType registration and Query parsing/creation
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
26 * @short_description: Dynamically register new query types. Provide functions
27 * to create queries, and to set and parse values in them.
28 * @see_also: #GstPad, #GstElement
30 * GstQuery functions are used to register new query types to the gstreamer
32 * Queries can be performed on pads (gst_pad_query()) and elements
33 * (gst_element_query()). Please note that some queries might need a running
36 * Queries can be created using the gst_query_new_*() functions.
37 * Query values can be set using gst_query_set_*(), and parsed using
38 * gst_query_parse_*() helpers.
40 * The following example shows how to query the duration of a pipeline:
43 * <title>Query duration on a pipeline</title>
47 * query = gst_query_new_duration (GST_FORMAT_TIME);
48 * res = gst_element_query (pipeline, query);
51 * gst_query_parse_duration (query, NULL, &duration);
52 * g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration));
55 * g_print ("duration query failed...");
57 * gst_query_unref (query);
61 * Last reviewed on 2006-02-14 (0.10.4)
64 #include "gst_private.h"
68 #include "gstenumtypes.h"
72 GST_DEBUG_CATEGORY_STATIC (gst_query_debug);
73 #define GST_CAT_DEFAULT gst_query_debug
75 static void gst_query_finalize (GstQuery * query);
76 static GstQuery *_gst_query_copy (GstQuery * query);
78 static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
79 static GList *_gst_queries = NULL;
80 static GHashTable *_nick_to_query = NULL;
81 static GHashTable *_query_type_to_nick = NULL;
82 static guint32 _n_values = 1; /* we start from 1 because 0 reserved for NONE */
84 static GstMiniObjectClass *parent_class = NULL;
86 static GstQueryTypeDefinition standard_definitions[] = {
87 {GST_QUERY_POSITION, "position", "Current position", 0},
88 {GST_QUERY_DURATION, "duration", "Total duration", 0},
89 {GST_QUERY_LATENCY, "latency", "Latency", 0},
90 {GST_QUERY_JITTER, "jitter", "Jitter", 0},
91 {GST_QUERY_RATE, "rate", "Configured rate 1000000 = 1", 0},
92 {GST_QUERY_SEEKING, "seeking", "Seeking capabilities and parameters", 0},
93 {GST_QUERY_SEGMENT, "segment", "currently configured segment", 0},
94 {GST_QUERY_CONVERT, "convert", "Converting between formats", 0},
95 {GST_QUERY_FORMATS, "formats", "Supported formats for conversion", 0},
96 {GST_QUERY_BUFFERING, "buffering", "Buffering status", 0},
97 {GST_QUERY_CUSTOM, "custom", "Custom query", 0},
98 {GST_QUERY_URI, "uri", "URI of the source or sink", 0},
103 _gst_query_initialize (void)
105 GstQueryTypeDefinition *standards = standard_definitions;
107 GST_CAT_INFO (GST_CAT_GST_INIT, "init queries");
109 GST_DEBUG_CATEGORY_INIT (gst_query_debug, "query", 0, "query system");
111 g_static_mutex_lock (&mutex);
112 if (_nick_to_query == NULL) {
113 _nick_to_query = g_hash_table_new (g_str_hash, g_str_equal);
114 _query_type_to_nick = g_hash_table_new (NULL, NULL);
117 while (standards->nick) {
118 standards->quark = g_quark_from_static_string (standards->nick);
119 g_hash_table_insert (_nick_to_query, (gpointer) standards->nick, standards);
120 g_hash_table_insert (_query_type_to_nick,
121 GINT_TO_POINTER (standards->value), standards);
123 _gst_queries = g_list_append (_gst_queries, standards);
127 g_static_mutex_unlock (&mutex);
129 g_type_class_ref (gst_query_get_type ());
133 * gst_query_type_get_name:
134 * @query: the query type
136 * Get a printable name for the given query type. Do not modify or free.
138 * Returns: a reference to the static name of the query.
141 gst_query_type_get_name (GstQueryType query)
143 const GstQueryTypeDefinition *def;
145 def = gst_query_type_get_details (query);
151 * gst_query_type_to_quark:
152 * @query: the query type
154 * Get the unique quark for the given query type.
156 * Returns: the quark associated with the query type
159 gst_query_type_to_quark (GstQueryType query)
161 const GstQueryTypeDefinition *def;
163 def = gst_query_type_get_details (query);
168 G_DEFINE_TYPE (GstQuery, gst_query, GST_TYPE_MINI_OBJECT);
171 gst_query_class_init (GstQueryClass * klass)
173 parent_class = g_type_class_peek_parent (klass);
175 klass->mini_object_class.copy = (GstMiniObjectCopyFunction) _gst_query_copy;
176 klass->mini_object_class.finalize =
177 (GstMiniObjectFinalizeFunction) gst_query_finalize;
182 gst_query_init (GstQuery * query)
187 gst_query_finalize (GstQuery * query)
189 g_return_if_fail (query != NULL);
191 if (query->structure) {
192 gst_structure_set_parent_refcount (query->structure, NULL);
193 gst_structure_free (query->structure);
196 /* GST_MINI_OBJECT_CLASS (parent_class)->finalize (GST_MINI_OBJECT (query)); */
200 _gst_query_copy (GstQuery * query)
204 copy = (GstQuery *) gst_mini_object_new (GST_TYPE_QUERY);
206 copy->type = query->type;
208 if (query->structure) {
209 copy->structure = gst_structure_copy (query->structure);
210 gst_structure_set_parent_refcount (copy->structure,
211 &query->mini_object.refcount);
220 * gst_query_type_register:
221 * @nick: The nick of the new query
222 * @description: The description of the new query
224 * Create a new GstQueryType based on the nick or return an
225 * already registered query with that nick
227 * Returns: A new GstQueryType or an already registered query
228 * with the same nick.
231 gst_query_type_register (const gchar * nick, const gchar * description)
233 GstQueryTypeDefinition *query;
236 g_return_val_if_fail (nick != NULL, 0);
237 g_return_val_if_fail (description != NULL, 0);
239 lookup = gst_query_type_get_by_nick (nick);
240 if (lookup != GST_QUERY_NONE)
243 query = g_slice_new (GstQueryTypeDefinition);
244 query->value = _n_values;
245 query->nick = g_strdup (nick);
246 query->description = g_strdup (description);
247 query->quark = g_quark_from_static_string (query->nick);
249 g_static_mutex_lock (&mutex);
250 g_hash_table_insert (_nick_to_query, (gpointer) query->nick, query);
251 g_hash_table_insert (_query_type_to_nick, GINT_TO_POINTER (query->value),
253 _gst_queries = g_list_append (_gst_queries, query);
255 g_static_mutex_unlock (&mutex);
261 * gst_query_type_get_by_nick:
262 * @nick: The nick of the query
264 * Get the query type registered with @nick.
266 * Returns: The query registered with @nick or #GST_QUERY_NONE
267 * if the query was not registered.
270 gst_query_type_get_by_nick (const gchar * nick)
272 GstQueryTypeDefinition *query;
274 g_return_val_if_fail (nick != NULL, 0);
276 g_static_mutex_lock (&mutex);
277 query = g_hash_table_lookup (_nick_to_query, nick);
278 g_static_mutex_unlock (&mutex);
283 return GST_QUERY_NONE;
287 * gst_query_types_contains:
288 * @types: The query array to search
289 * @type: the #GstQueryType to find
291 * See if the given #GstQueryType is inside the @types query types array.
293 * Returns: TRUE if the type is found inside the array
296 gst_query_types_contains (const GstQueryType * types, GstQueryType type)
312 * gst_query_type_get_details:
313 * @type: a #GstQueryType
315 * Get details about the given #GstQueryType.
317 * Returns: The #GstQueryTypeDefinition for @type or NULL on failure.
319 const GstQueryTypeDefinition *
320 gst_query_type_get_details (GstQueryType type)
322 const GstQueryTypeDefinition *result;
324 g_static_mutex_lock (&mutex);
325 result = g_hash_table_lookup (_query_type_to_nick, GINT_TO_POINTER (type));
326 g_static_mutex_unlock (&mutex);
332 * gst_query_type_iterate_definitions:
334 * Get a #GstIterator of all the registered query types. The definitions
335 * iterated over are read only.
337 * Free-function: gst_iterator_free
339 * Returns: (transfer full): a #GstIterator of #GstQueryTypeDefinition.
342 gst_query_type_iterate_definitions (void)
346 g_static_mutex_lock (&mutex);
347 /* FIXME: register a boxed type for GstQueryTypeDefinition */
348 result = gst_iterator_new_list (G_TYPE_POINTER,
349 g_static_mutex_get_mutex (&mutex), &_n_values, &_gst_queries,
351 g_static_mutex_unlock (&mutex);
357 gst_query_new (GstQueryType type, GstStructure * structure)
361 query = (GstQuery *) gst_mini_object_new (GST_TYPE_QUERY);
363 GST_DEBUG ("creating new query %p %d", query, type);
368 query->structure = structure;
369 gst_structure_set_parent_refcount (query->structure,
370 &query->mini_object.refcount);
372 query->structure = NULL;
379 * gst_query_new_position:
380 * @format: the default #GstFormat for the new query
382 * Constructs a new query stream position query object. Use gst_query_unref()
383 * when done with it. A position query is used to query the current position
384 * of playback in the streams, in some format.
386 * Free-function: gst_query_unref
388 * Returns: (transfer full): a new #GstQuery
391 gst_query_new_position (GstFormat format)
394 GstStructure *structure;
396 structure = gst_structure_id_new (GST_QUARK (QUERY_POSITION),
397 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
398 GST_QUARK (CURRENT), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
400 query = gst_query_new (GST_QUERY_POSITION, structure);
406 * gst_query_set_position:
407 * @query: a #GstQuery with query type GST_QUERY_POSITION
408 * @format: the requested #GstFormat
409 * @cur: the position to set
411 * Answer a position query by setting the requested value in the given format.
414 gst_query_set_position (GstQuery * query, GstFormat format, gint64 cur)
416 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
418 gst_structure_id_set (query->structure,
419 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
420 GST_QUARK (CURRENT), G_TYPE_INT64, cur, NULL);
424 * gst_query_parse_position:
425 * @query: a #GstQuery
426 * @format: (out) (allow-none): the storage for the #GstFormat of the
427 * position values (may be NULL)
428 * @cur: (out) (allow-none): the storage for the current position (may be NULL)
430 * Parse a position query, writing the format into @format, and the position
431 * into @cur, if the respective parameters are non-NULL.
434 gst_query_parse_position (GstQuery * query, GstFormat * format, gint64 * cur)
436 GstStructure *structure;
438 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
440 structure = query->structure;
442 *format = g_value_get_enum (gst_structure_id_get_value (structure,
443 GST_QUARK (FORMAT)));
445 *cur = g_value_get_int64 (gst_structure_id_get_value (structure,
446 GST_QUARK (CURRENT)));
451 * gst_query_new_duration:
452 * @format: the #GstFormat for this duration query
454 * Constructs a new stream duration query object to query in the given format.
455 * Use gst_query_unref() when done with it. A duration query will give the
456 * total length of the stream.
458 * Free-function: gst_query_unref
460 * Returns: (transfer full): a new #GstQuery
463 gst_query_new_duration (GstFormat format)
466 GstStructure *structure;
468 structure = gst_structure_id_new (GST_QUARK (QUERY_DURATION),
469 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
470 GST_QUARK (DURATION), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
472 query = gst_query_new (GST_QUERY_DURATION, structure);
478 * gst_query_set_duration:
479 * @query: a #GstQuery
480 * @format: the #GstFormat for the duration
481 * @duration: the duration of the stream
483 * Answer a duration query by setting the requested value in the given format.
486 gst_query_set_duration (GstQuery * query, GstFormat format, gint64 duration)
488 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
490 gst_structure_id_set (query->structure,
491 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
492 GST_QUARK (DURATION), G_TYPE_INT64, duration, NULL);
496 * gst_query_parse_duration:
497 * @query: a #GstQuery
498 * @format: (out) (allow-none): the storage for the #GstFormat of the duration
500 * @duration: (out) (allow-none): the storage for the total duration, or NULL.
502 * Parse a duration query answer. Write the format of the duration into @format,
503 * and the value into @duration, if the respective variables are non-NULL.
506 gst_query_parse_duration (GstQuery * query, GstFormat * format,
509 GstStructure *structure;
511 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
513 structure = query->structure;
515 *format = g_value_get_enum (gst_structure_id_get_value (structure,
516 GST_QUARK (FORMAT)));
518 *duration = g_value_get_int64 (gst_structure_id_get_value (structure,
519 GST_QUARK (DURATION)));
523 * gst_query_new_latency:
525 * Constructs a new latency query object.
526 * Use gst_query_unref() when done with it. A latency query is usually performed
527 * by sinks to compensate for additional latency introduced by elements in the
530 * Free-function: gst_query_unref
532 * Returns: (transfer full): a #GstQuery
537 gst_query_new_latency (void)
540 GstStructure *structure;
542 structure = gst_structure_id_new (GST_QUARK (QUERY_LATENCY),
543 GST_QUARK (LIVE), G_TYPE_BOOLEAN, FALSE,
544 GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
545 GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (-1), NULL);
547 query = gst_query_new (GST_QUERY_LATENCY, structure);
553 * gst_query_set_latency:
554 * @query: a #GstQuery
555 * @live: if there is a live element upstream
556 * @min_latency: the minimal latency of the live element
557 * @max_latency: the maximal latency of the live element
559 * Answer a latency query by setting the requested values in the given format.
564 gst_query_set_latency (GstQuery * query, gboolean live,
565 GstClockTime min_latency, GstClockTime max_latency)
567 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
569 gst_structure_id_set (query->structure,
570 GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
571 GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, min_latency,
572 GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, max_latency, NULL);
576 * gst_query_parse_latency:
577 * @query: a #GstQuery
578 * @live: (out) (allow-none): storage for live or NULL
579 * @min_latency: (out) (allow-none): the storage for the min latency or NULL
580 * @max_latency: (out) (allow-none): the storage for the max latency or NULL
582 * Parse a latency query answer.
587 gst_query_parse_latency (GstQuery * query, gboolean * live,
588 GstClockTime * min_latency, GstClockTime * max_latency)
590 GstStructure *structure;
592 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
594 structure = query->structure;
597 g_value_get_boolean (gst_structure_id_get_value (structure,
600 *min_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
601 GST_QUARK (MIN_LATENCY)));
603 *max_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
604 GST_QUARK (MAX_LATENCY)));
608 * gst_query_new_convert:
609 * @src_format: the source #GstFormat for the new query
610 * @value: the value to convert
611 * @dest_format: the target #GstFormat
613 * Constructs a new convert query object. Use gst_query_unref()
614 * when done with it. A convert query is used to ask for a conversion between
615 * one format and another.
617 * Free-function: gst_query_unref
619 * Returns: (transfer full): a #GstQuery
622 gst_query_new_convert (GstFormat src_format, gint64 value,
623 GstFormat dest_format)
626 GstStructure *structure;
628 structure = gst_structure_id_new (GST_QUARK (QUERY_CONVERT),
629 GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
630 GST_QUARK (SRC_VALUE), G_TYPE_INT64, value,
631 GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
632 GST_QUARK (DEST_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
634 query = gst_query_new (GST_QUERY_CONVERT, structure);
640 * gst_query_set_convert:
641 * @query: a #GstQuery
642 * @src_format: the source #GstFormat
643 * @src_value: the source value
644 * @dest_format: the destination #GstFormat
645 * @dest_value: the destination value
647 * Answer a convert query by setting the requested values.
650 gst_query_set_convert (GstQuery * query, GstFormat src_format, gint64 src_value,
651 GstFormat dest_format, gint64 dest_value)
653 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONVERT);
655 gst_structure_id_set (query->structure,
656 GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
657 GST_QUARK (SRC_VALUE), G_TYPE_INT64, src_value,
658 GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
659 GST_QUARK (DEST_VALUE), G_TYPE_INT64, dest_value, NULL);
663 * gst_query_parse_convert:
664 * @query: a #GstQuery
665 * @src_format: (out) (allow-none): the storage for the #GstFormat of the
666 * source value, or NULL
667 * @src_value: (out) (allow-none): the storage for the source value, or NULL
668 * @dest_format: (out) (allow-none): the storage for the #GstFormat of the
669 * destination value, or NULL
670 * @dest_value: (out) (allow-none): the storage for the destination value,
673 * Parse a convert query answer. Any of @src_format, @src_value, @dest_format,
674 * and @dest_value may be NULL, in which case that value is omitted.
677 gst_query_parse_convert (GstQuery * query, GstFormat * src_format,
678 gint64 * src_value, GstFormat * dest_format, gint64 * dest_value)
680 GstStructure *structure;
682 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONVERT);
684 structure = query->structure;
686 *src_format = g_value_get_enum (gst_structure_id_get_value (structure,
687 GST_QUARK (SRC_FORMAT)));
689 *src_value = g_value_get_int64 (gst_structure_id_get_value (structure,
690 GST_QUARK (SRC_VALUE)));
692 *dest_format = g_value_get_enum (gst_structure_id_get_value (structure,
693 GST_QUARK (DEST_FORMAT)));
695 *dest_value = g_value_get_int64 (gst_structure_id_get_value (structure,
696 GST_QUARK (DEST_VALUE)));
700 * gst_query_new_segment:
701 * @format: the #GstFormat for the new query
703 * Constructs a new segment query object. Use gst_query_unref()
704 * when done with it. A segment query is used to discover information about the
705 * currently configured segment for playback.
707 * Free-function: gst_query_unref
709 * Returns: (transfer full): a new #GstQuery
712 gst_query_new_segment (GstFormat format)
715 GstStructure *structure;
717 structure = gst_structure_id_new (GST_QUARK (QUERY_SEGMENT),
718 GST_QUARK (RATE), G_TYPE_DOUBLE, (gdouble) 0.0,
719 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
720 GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
721 GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
723 query = gst_query_new (GST_QUERY_SEGMENT, structure);
729 * gst_query_set_segment:
730 * @query: a #GstQuery
731 * @rate: the rate of the segment
732 * @format: the #GstFormat of the segment values (@start_value and @stop_value)
733 * @start_value: the start value
734 * @stop_value: the stop value
736 * Answer a segment query by setting the requested values. The normal
737 * playback segment of a pipeline is 0 to duration at the default rate of
738 * 1.0. If a seek was performed on the pipeline to play a different
739 * segment, this query will return the range specified in the last seek.
741 * @start_value and @stop_value will respectively contain the configured
742 * playback range start and stop values expressed in @format.
743 * The values are always between 0 and the duration of the media and
744 * @start_value <= @stop_value. @rate will contain the playback rate. For
745 * negative rates, playback will actually happen from @stop_value to
749 gst_query_set_segment (GstQuery * query, gdouble rate, GstFormat format,
750 gint64 start_value, gint64 stop_value)
752 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEGMENT);
754 gst_structure_id_set (query->structure,
755 GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
756 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
757 GST_QUARK (START_VALUE), G_TYPE_INT64, start_value,
758 GST_QUARK (STOP_VALUE), G_TYPE_INT64, stop_value, NULL);
762 * gst_query_parse_segment:
763 * @query: a #GstQuery
764 * @rate: (out) (allow-none): the storage for the rate of the segment, or NULL
765 * @format: (out) (allow-none): the storage for the #GstFormat of the values,
767 * @start_value: (out) (allow-none): the storage for the start value, or NULL
768 * @stop_value: (out) (allow-none): the storage for the stop value, or NULL
770 * Parse a segment query answer. Any of @rate, @format, @start_value, and
771 * @stop_value may be NULL, which will cause this value to be omitted.
773 * See gst_query_set_segment() for an explanation of the function arguments.
776 gst_query_parse_segment (GstQuery * query, gdouble * rate, GstFormat * format,
777 gint64 * start_value, gint64 * stop_value)
779 GstStructure *structure;
781 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEGMENT);
783 structure = query->structure;
785 *rate = g_value_get_double (gst_structure_id_get_value (structure,
788 *format = g_value_get_enum (gst_structure_id_get_value (structure,
789 GST_QUARK (FORMAT)));
791 *start_value = g_value_get_int64 (gst_structure_id_get_value (structure,
792 GST_QUARK (START_VALUE)));
794 *stop_value = g_value_get_int64 (gst_structure_id_get_value (structure,
795 GST_QUARK (STOP_VALUE)));
799 * gst_query_new_application:
800 * @type: the query type
801 * @structure: a structure for the query
803 * Constructs a new custom application query object. Use gst_query_unref()
806 * Free-function: gst_query_unref
808 * Returns: (transfer full): a new #GstQuery
811 gst_query_new_application (GstQueryType type, GstStructure * structure)
813 g_return_val_if_fail (gst_query_type_get_details (type) != NULL, NULL);
814 g_return_val_if_fail (structure != NULL, NULL);
816 return gst_query_new (type, structure);
820 * gst_query_get_structure:
821 * @query: a #GstQuery
823 * Get the structure of a query.
825 * Returns: (transfer none): the #GstStructure of the query. The structure is
826 * still owned by the query and will therefore be freed when the query
830 gst_query_get_structure (GstQuery * query)
832 g_return_val_if_fail (GST_IS_QUERY (query), NULL);
834 return query->structure;
838 * gst_query_new_seeking:
839 * @format: the default #GstFormat for the new query
841 * Constructs a new query object for querying seeking properties of
844 * Free-function: gst_query_unref
846 * Returns: (transfer full): a new #GstQuery
849 gst_query_new_seeking (GstFormat format)
852 GstStructure *structure;
854 structure = gst_structure_id_new (GST_QUARK (QUERY_SEEKING),
855 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
856 GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, FALSE,
857 GST_QUARK (SEGMENT_START), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
858 GST_QUARK (SEGMENT_END), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
860 query = gst_query_new (GST_QUERY_SEEKING, structure);
866 * gst_query_set_seeking:
867 * @query: a #GstQuery
868 * @format: the format to set for the @segment_start and @segment_end values
869 * @seekable: the seekable flag to set
870 * @segment_start: the segment_start to set
871 * @segment_end: the segment_end to set
873 * Set the seeking query result fields in @query.
876 gst_query_set_seeking (GstQuery * query, GstFormat format,
877 gboolean seekable, gint64 segment_start, gint64 segment_end)
879 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEEKING);
881 gst_structure_id_set (query->structure,
882 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
883 GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, seekable,
884 GST_QUARK (SEGMENT_START), G_TYPE_INT64, segment_start,
885 GST_QUARK (SEGMENT_END), G_TYPE_INT64, segment_end, NULL);
889 * gst_query_parse_seeking:
890 * @query: a GST_QUERY_SEEKING type query #GstQuery
891 * @format: (out) (allow-none): the format to set for the @segment_start
892 * and @segment_end values, or NULL
893 * @seekable: (out) (allow-none): the seekable flag to set, or NULL
894 * @segment_start: (out) (allow-none): the segment_start to set, or NULL
895 * @segment_end: (out) (allow-none): the segment_end to set, or NULL
897 * Parse a seeking query, writing the format into @format, and
898 * other results into the passed parameters, if the respective parameters
902 gst_query_parse_seeking (GstQuery * query, GstFormat * format,
903 gboolean * seekable, gint64 * segment_start, gint64 * segment_end)
905 GstStructure *structure;
907 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEEKING);
909 structure = query->structure;
911 *format = g_value_get_enum (gst_structure_id_get_value (structure,
912 GST_QUARK (FORMAT)));
914 *seekable = g_value_get_boolean (gst_structure_id_get_value (structure,
915 GST_QUARK (SEEKABLE)));
917 *segment_start = g_value_get_int64 (gst_structure_id_get_value (structure,
918 GST_QUARK (SEGMENT_START)));
920 *segment_end = g_value_get_int64 (gst_structure_id_get_value (structure,
921 GST_QUARK (SEGMENT_END)));
925 * gst_query_new_formats:
927 * Constructs a new query object for querying formats of
930 * Free-function: gst_query_unref
932 * Returns: (transfer full): a new #GstQuery
937 gst_query_new_formats (void)
940 GstStructure *structure;
942 structure = gst_structure_id_empty_new (GST_QUARK (QUERY_FORMATS));
943 query = gst_query_new (GST_QUERY_FORMATS, structure);
949 gst_query_list_add_format (GValue * list, GstFormat format)
951 GValue item = { 0, };
953 g_value_init (&item, GST_TYPE_FORMAT);
954 g_value_set_enum (&item, format);
955 gst_value_list_append_value (list, &item);
956 g_value_unset (&item);
960 * gst_query_set_formats:
961 * @query: a #GstQuery
962 * @n_formats: the number of formats to set.
963 * @...: A number of @GstFormats equal to @n_formats.
965 * Set the formats query result fields in @query. The number of formats passed
966 * must be equal to @n_formats.
969 gst_query_set_formats (GstQuery * query, gint n_formats, ...)
972 GValue list = { 0, };
975 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
977 g_value_init (&list, GST_TYPE_LIST);
979 va_start (ap, n_formats);
980 for (i = 0; i < n_formats; i++) {
981 gst_query_list_add_format (&list, va_arg (ap, GstFormat));
985 gst_structure_set_value (query->structure, "formats", &list);
987 g_value_unset (&list);
992 * gst_query_set_formatsv:
993 * @query: a #GstQuery
994 * @n_formats: the number of formats to set.
995 * @formats: (in) (array length=n_formats): an array containing @n_formats
998 * Set the formats query result fields in @query. The number of formats passed
999 * in the @formats array must be equal to @n_formats.
1004 gst_query_set_formatsv (GstQuery * query, gint n_formats, GstFormat * formats)
1006 GValue list = { 0, };
1009 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
1011 g_value_init (&list, GST_TYPE_LIST);
1012 for (i = 0; i < n_formats; i++) {
1013 gst_query_list_add_format (&list, formats[i]);
1015 gst_structure_set_value (query->structure, "formats", &list);
1017 g_value_unset (&list);
1021 * gst_query_parse_formats_length:
1022 * @query: a #GstQuery
1023 * @n_formats: (out): the number of formats in this query.
1025 * Parse the number of formats in the formats @query.
1030 gst_query_parse_formats_length (GstQuery * query, guint * n_formats)
1032 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
1037 list = gst_structure_get_value (query->structure, "formats");
1041 *n_formats = gst_value_list_get_size (list);
1046 * gst_query_parse_formats_nth:
1047 * @query: a #GstQuery
1048 * @nth: (out): the nth format to retrieve.
1049 * @format: (out): a pointer to store the nth format
1051 * Parse the format query and retrieve the @nth format from it into
1052 * @format. If the list contains less elements than @nth, @format will be
1053 * set to GST_FORMAT_UNDEFINED.
1058 gst_query_parse_formats_nth (GstQuery * query, guint nth, GstFormat * format)
1060 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
1065 list = gst_structure_get_value (query->structure, "formats");
1067 *format = GST_FORMAT_UNDEFINED;
1069 if (nth < gst_value_list_get_size (list)) {
1070 *format = g_value_get_enum (gst_value_list_get_value (list, nth));
1072 *format = GST_FORMAT_UNDEFINED;
1078 * gst_query_new_buffering
1079 * @format: the default #GstFormat for the new query
1081 * Constructs a new query object for querying the buffering status of
1084 * Free-function: gst_query_new
1086 * Returns: (transfer full): a new #GstQuery
1091 gst_query_new_buffering (GstFormat format)
1094 GstStructure *structure;
1096 /* by default, we configure the answer as no buffering with a 100% buffering
1098 structure = gst_structure_id_new (GST_QUARK (QUERY_BUFFERING),
1099 GST_QUARK (BUSY), G_TYPE_BOOLEAN, FALSE,
1100 GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, 100,
1101 GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, GST_BUFFERING_STREAM,
1102 GST_QUARK (AVG_IN_RATE), G_TYPE_INT, -1,
1103 GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, -1,
1104 GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, G_GINT64_CONSTANT (0),
1105 GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
1106 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
1107 GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
1108 GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
1110 query = gst_query_new (GST_QUERY_BUFFERING, structure);
1116 * gst_query_set_buffering_percent
1117 * @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
1118 * @busy: if buffering is busy
1119 * @percent: a buffering percent
1121 * Set the percentage of buffered data. This is a value between 0 and 100.
1122 * The @busy indicator is %TRUE when the buffering is in progress.
1127 gst_query_set_buffering_percent (GstQuery * query, gboolean busy, gint percent)
1129 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
1130 g_return_if_fail (percent >= 0 && percent <= 100);
1132 gst_structure_id_set (query->structure,
1133 GST_QUARK (BUSY), G_TYPE_BOOLEAN, busy,
1134 GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, percent, NULL);
1138 * gst_query_parse_buffering_percent
1139 * @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
1140 * @busy: (out) (allow-none): if buffering is busy, or NULL
1141 * @percent: (out) (allow-none): a buffering percent, or NULL
1143 * Get the percentage of buffered data. This is a value between 0 and 100.
1144 * The @busy indicator is %TRUE when the buffering is in progress.
1149 gst_query_parse_buffering_percent (GstQuery * query, gboolean * busy,
1152 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
1155 *busy = g_value_get_boolean (gst_structure_id_get_value (query->structure,
1158 *percent = g_value_get_int (gst_structure_id_get_value (query->structure,
1159 GST_QUARK (BUFFER_PERCENT)));
1163 * gst_query_set_buffering_stats:
1164 * @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
1165 * @mode: a buffering mode
1166 * @avg_in: the average input rate
1167 * @avg_out: the average output rate
1168 * @buffering_left: amount of buffering time left
1170 * Configures the buffering stats values in @query.
1175 gst_query_set_buffering_stats (GstQuery * query, GstBufferingMode mode,
1176 gint avg_in, gint avg_out, gint64 buffering_left)
1178 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
1180 gst_structure_id_set (query->structure,
1181 GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, mode,
1182 GST_QUARK (AVG_IN_RATE), G_TYPE_INT, avg_in,
1183 GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, avg_out,
1184 GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
1188 * gst_query_parse_buffering_stats:
1189 * @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
1190 * @mode: (out) (allow-none): a buffering mode, or NULL
1191 * @avg_in: (out) (allow-none): the average input rate, or NULL
1192 * @avg_out: (out) (allow-none): the average output rat, or NULLe
1193 * @buffering_left: (out) (allow-none): amount of buffering time left, or NULL
1195 * Extracts the buffering stats values from @query.
1200 gst_query_parse_buffering_stats (GstQuery * query,
1201 GstBufferingMode * mode, gint * avg_in, gint * avg_out,
1202 gint64 * buffering_left)
1204 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
1207 *mode = g_value_get_enum (gst_structure_id_get_value (query->structure,
1208 GST_QUARK (BUFFERING_MODE)));
1210 *avg_in = g_value_get_int (gst_structure_id_get_value (query->structure,
1211 GST_QUARK (AVG_IN_RATE)));
1213 *avg_out = g_value_get_int (gst_structure_id_get_value (query->structure,
1214 GST_QUARK (AVG_OUT_RATE)));
1217 g_value_get_int64 (gst_structure_id_get_value (query->structure,
1218 GST_QUARK (BUFFERING_LEFT)));
1223 * gst_query_set_buffering_range:
1224 * @query: a #GstQuery
1225 * @format: the format to set for the @start and @stop values
1226 * @start: the start to set
1227 * @stop: the stop to set
1228 * @estimated_total: estimated total amount of download time
1230 * Set the available query result fields in @query.
1235 gst_query_set_buffering_range (GstQuery * query, GstFormat format,
1236 gint64 start, gint64 stop, gint64 estimated_total)
1238 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
1240 gst_structure_id_set (query->structure,
1241 GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
1242 GST_QUARK (START_VALUE), G_TYPE_INT64, start,
1243 GST_QUARK (STOP_VALUE), G_TYPE_INT64, stop,
1244 GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, estimated_total, NULL);
1248 * gst_query_parse_buffering_range:
1249 * @query: a GST_QUERY_BUFFERING type query #GstQuery
1250 * @format: (out) (allow-none): the format to set for the @segment_start
1251 * and @segment_end values, or NULL
1252 * @start: (out) (allow-none): the start to set, or NULL
1253 * @stop: (out) (allow-none): the stop to set, or NULL
1254 * @estimated_total: (out) (allow-none): estimated total amount of download
1257 * Parse an available query, writing the format into @format, and
1258 * other results into the passed parameters, if the respective parameters
1264 gst_query_parse_buffering_range (GstQuery * query, GstFormat * format,
1265 gint64 * start, gint64 * stop, gint64 * estimated_total)
1267 GstStructure *structure;
1269 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
1271 structure = query->structure;
1273 *format = g_value_get_enum (gst_structure_id_get_value (structure,
1274 GST_QUARK (FORMAT)));
1276 *start = g_value_get_int64 (gst_structure_id_get_value (structure,
1277 GST_QUARK (START_VALUE)));
1279 *stop = g_value_get_int64 (gst_structure_id_get_value (structure,
1280 GST_QUARK (STOP_VALUE)));
1281 if (estimated_total)
1283 g_value_get_int64 (gst_structure_id_get_value (structure,
1284 GST_QUARK (ESTIMATED_TOTAL)));
1288 * gst_query_add_buffering_range
1289 * @query: a GST_QUERY_BUFFERING type query #GstQuery
1290 * @start: start position of the range
1291 * @stop: stop position of the range
1293 * Set the buffering-ranges array field in @query. The current last
1294 * start position of the array should be inferior to @start.
1296 * Returns: a #gboolean indicating if the range was added or not.
1301 gst_query_add_buffering_range (GstQuery * query, gint64 start, gint64 stop)
1304 GValue *last_array_value;
1305 const GValue *value;
1306 GValue range_value = { 0 };
1308 g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING, FALSE);
1310 if (G_UNLIKELY (start >= stop))
1314 gst_structure_id_get_value (query->structure,
1315 GST_QUARK (BUFFERING_RANGES));
1317 array = (GValueArray *) g_value_get_boxed (value);
1318 last_array_value = g_value_array_get_nth (array, array->n_values - 1);
1319 if (G_UNLIKELY (start <= gst_value_get_int64_range_min (last_array_value)))
1322 GValue new_array_val = { 0, };
1324 array = g_value_array_new (0);
1326 g_value_init (&new_array_val, G_TYPE_VALUE_ARRAY);
1327 g_value_take_boxed (&new_array_val, array);
1329 /* set the value array only once, so we then modify (append to) the
1330 * existing value array owned by the GstStructure / the field's GValue */
1331 gst_structure_id_take_value (query->structure, GST_QUARK (BUFFERING_RANGES),
1335 g_value_init (&range_value, GST_TYPE_INT64_RANGE);
1336 gst_value_set_int64_range (&range_value, start, stop);
1337 g_value_array_append (array, &range_value);
1338 /* skip the g_value_unset(&range_value) here, we know it's not needed */
1344 * gst_query_get_n_buffering_ranges
1345 * @query: a GST_QUERY_BUFFERING type query #GstQuery
1347 * Retrieve the number of values currently stored in the
1348 * buffered-ranges array of the query's structure.
1350 * Returns: the range array size as a #guint.
1355 gst_query_get_n_buffering_ranges (GstQuery * query)
1358 const GValue *value;
1361 g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING, 0);
1364 gst_structure_id_get_value (query->structure,
1365 GST_QUARK (BUFFERING_RANGES));
1367 array = (GValueArray *) g_value_get_boxed (value);
1368 size = array->n_values;
1375 * gst_query_parse_nth_buffering_range
1376 * @query: a GST_QUERY_BUFFERING type query #GstQuery
1377 * @index: position in the buffered-ranges array to read
1378 * @start: (out) (allow-none): the start position to set, or NULL
1379 * @stop: (out) (allow-none): the stop position to set, or NULL
1381 * Parse an available query and get the start and stop values stored
1382 * at the @index of the buffered ranges array.
1384 * Returns: a #gboolean indicating if the parsing succeeded.
1389 gst_query_parse_nth_buffering_range (GstQuery * query, guint index,
1390 gint64 * start, gint64 * stop)
1392 const GValue *value;
1393 GValueArray *ranges;
1394 GValue *range_value;
1395 gboolean ret = FALSE;
1397 g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING, ret);
1400 gst_structure_id_get_value (query->structure,
1401 GST_QUARK (BUFFERING_RANGES));
1402 ranges = (GValueArray *) g_value_get_boxed (value);
1403 range_value = g_value_array_get_nth (ranges, index);
1406 *start = gst_value_get_int64_range_min (range_value);
1408 *stop = gst_value_get_int64_range_max (range_value);
1417 * gst_query_new_uri:
1419 * Constructs a new query URI query object. Use gst_query_unref()
1420 * when done with it. An URI query is used to query the current URI
1421 * that is used by the source or sink.
1423 * Free-function: gst_query_unref
1425 * Returns: (transfer full): a new #GstQuery
1430 gst_query_new_uri (void)
1433 GstStructure *structure;
1435 structure = gst_structure_id_new (GST_QUARK (QUERY_URI),
1436 GST_QUARK (URI), G_TYPE_STRING, NULL, NULL);
1438 query = gst_query_new (GST_QUERY_URI, structure);
1444 * gst_query_set_uri:
1445 * @query: a #GstQuery with query type GST_QUERY_URI
1446 * @uri: the URI to set
1448 * Answer a URI query by setting the requested URI.
1453 gst_query_set_uri (GstQuery * query, const gchar * uri)
1455 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
1456 g_return_if_fail (gst_uri_is_valid (uri));
1458 gst_structure_id_set (query->structure, GST_QUARK (URI), G_TYPE_STRING, uri,
1463 * gst_query_parse_uri:
1464 * @query: a #GstQuery
1465 * @uri: (out callee-allocates) (allow-none): the storage for the current URI
1468 * Parse an URI query, writing the URI into @uri as a newly
1469 * allocated string, if the respective parameters are non-NULL.
1470 * Free the string with g_free() after usage.
1475 gst_query_parse_uri (GstQuery * query, gchar ** uri)
1477 g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
1480 *uri = g_value_dup_string (gst_structure_id_get_value (query->structure,