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c8380cb0d2
Maybe gcc can do something clever with that, or at least warn us if we don't save the return value somewhere.
342 lines
13 KiB
C
342 lines
13 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstquery.h: GstQuery API declaration
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_QUERY_H__
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#define __GST_QUERY_H__
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#include <glib.h>
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#include <gst/gstiterator.h>
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#include <gst/gstminiobject.h>
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#include <gst/gststructure.h>
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#include <gst/gstformat.h>
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G_BEGIN_DECLS
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/**
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* GstQueryType:
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* @GST_QUERY_NONE: invalid query type
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* @GST_QUERY_POSITION: current position in stream
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* @GST_QUERY_DURATION: total duration of the stream
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* @GST_QUERY_LATENCY: latency of stream
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* @GST_QUERY_JITTER: current jitter of stream
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* @GST_QUERY_RATE: current rate of the stream
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* @GST_QUERY_SEEKING: seeking capabilities
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* @GST_QUERY_SEGMENT: segment start/stop positions
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* @GST_QUERY_CONVERT: convert values between formats
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* @GST_QUERY_FORMATS: query supported formats for convert
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* @GST_QUERY_BUFFERING: query available media for efficient seeking. Since
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* 0.10.20.
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* @GST_QUERY_CUSTOM: a custom application or element defined query. Since
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* 0.10.22.
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* @GST_QUERY_URI: query the URI of the source or sink. Since 0.10.22.
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*
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* Standard predefined Query types
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*/
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/* NOTE: don't forget to update the table in gstquery.c when changing
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* this enum */
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typedef enum {
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GST_QUERY_NONE = 0,
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GST_QUERY_POSITION,
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GST_QUERY_DURATION,
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GST_QUERY_LATENCY,
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GST_QUERY_JITTER, /* not in draft-query, necessary? */
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GST_QUERY_RATE,
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GST_QUERY_SEEKING,
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GST_QUERY_SEGMENT,
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GST_QUERY_CONVERT,
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GST_QUERY_FORMATS,
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GST_QUERY_BUFFERING,
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GST_QUERY_CUSTOM,
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GST_QUERY_URI
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} GstQueryType;
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/**
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* GstBufferingMode:
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* @GST_BUFFERING_STREAM: a small amount of data is buffered
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* @GST_BUFFERING_DOWNLOAD: the stream is being downloaded
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* @GST_BUFFERING_TIMESHIFT: the stream is being downloaded in a ringbuffer
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* @GST_BUFFERING_LIVE: the stream is a live stream
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*
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* The different types of buffering methods.
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*/
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typedef enum {
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GST_BUFFERING_STREAM,
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GST_BUFFERING_DOWNLOAD,
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GST_BUFFERING_TIMESHIFT,
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GST_BUFFERING_LIVE
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} GstBufferingMode;
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typedef struct _GstQueryTypeDefinition GstQueryTypeDefinition;
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typedef struct _GstQuery GstQuery;
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typedef struct _GstQueryClass GstQueryClass;
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/**
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* GstQueryTypeDefinition:
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* @value: the unique id of the Query type
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* @nick: a short nick
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* @description: a longer description of the query type
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* @quark: the quark for the nick
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*
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* A Query Type definition
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*/
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struct _GstQueryTypeDefinition
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{
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GstQueryType value;
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const gchar *nick;
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const gchar *description;
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GQuark quark;
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};
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#define GST_TYPE_QUERY (gst_query_get_type())
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#define GST_IS_QUERY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_QUERY))
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#define GST_IS_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_QUERY))
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#define GST_QUERY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_QUERY, GstQueryClass))
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#define GST_QUERY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_QUERY, GstQuery))
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#define GST_QUERY_CAST(obj) ((GstQuery*)(obj)) /* only since 0.10.23 */
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#define GST_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_QUERY, GstQueryClass))
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/**
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* GST_QUERY_TYPE:
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* @query: the query to query
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*
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* Get the #GstQueryType of the query.
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*/
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#define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type)
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/**
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* GST_QUERY_TYPE_NAME:
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* @query: the query to query
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*
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* Get a constant string representation of the #GstQueryType of the query.
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*
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* Since: 0.10.4
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*/
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#define GST_QUERY_TYPE_NAME(query) (gst_query_type_get_name(GST_QUERY_TYPE(query)))
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/**
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* GstQuery:
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* @mini_object: The parent #GstMiniObject type
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* @type: the #GstQueryType
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* @structure: the #GstStructure containing the query details.
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*
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* The #GstQuery structure.
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*/
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struct _GstQuery
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{
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GstMiniObject mini_object;
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/*< public > *//* with COW */
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GstQueryType type;
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GstStructure *structure;
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/*< private >*/
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gpointer _gst_reserved;
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};
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struct _GstQueryClass {
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GstMiniObjectClass mini_object_class;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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const gchar* gst_query_type_get_name (GstQueryType query);
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GQuark gst_query_type_to_quark (GstQueryType query);
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GType gst_query_get_type (void);
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/* register a new query */
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GstQueryType gst_query_type_register (const gchar *nick,
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const gchar *description);
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GstQueryType gst_query_type_get_by_nick (const gchar *nick);
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/* check if a query is in an array of querys */
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gboolean gst_query_types_contains (const GstQueryType *types,
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GstQueryType type);
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/* query for query details */
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const GstQueryTypeDefinition*
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gst_query_type_get_details (GstQueryType type);
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GstIterator* gst_query_type_iterate_definitions (void) G_GNUC_MALLOC;
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/* refcounting */
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/**
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* gst_query_ref:
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* @q: a #GstQuery to increase the refcount of.
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*
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* Increases the refcount of the given query by one.
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*
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* Returns: @q
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstQuery * gst_query_ref (GstQuery * q);
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#endif
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static inline GstQuery *
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gst_query_ref (GstQuery * q)
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{
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return GST_QUERY_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (q)));
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}
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/**
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* gst_query_unref:
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* @q: a #GstQuery to decrease the refcount of.
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*
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* Decreases the refcount of the query. If the refcount reaches 0, the query
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* will be freed.
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC void gst_query_unref (GstQuery * q);
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#endif
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static inline void
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gst_query_unref (GstQuery * q)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (q));
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}
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/* copy query */
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/**
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* gst_query_copy:
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* @q: a #GstQuery to copy.
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*
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* Copies the given query using the copy function of the parent #GstStructure.
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*
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* Free-function: gst_query_unref
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*
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* Returns: (transfer full): a new copy of @q.
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstQuery * gst_query_copy (const GstQuery * q);
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#endif
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static inline GstQuery *
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gst_query_copy (const GstQuery * q)
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{
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return GST_QUERY_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (q)));
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}
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/**
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* gst_query_make_writable:
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* @q: (transfer full): a #GstQuery to make writable
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*
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* Makes a writable query from the given query.
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*
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* Returns: (transfer full): a new writable query (possibly same as @q)
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*/
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#define gst_query_make_writable(q) GST_QUERY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (q)))
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/* position query */
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GstQuery* gst_query_new_position (GstFormat format) G_GNUC_MALLOC;
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void gst_query_set_position (GstQuery *query, GstFormat format, gint64 cur);
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void gst_query_parse_position (GstQuery *query, GstFormat *format, gint64 *cur);
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/* duration query */
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GstQuery* gst_query_new_duration (GstFormat format) G_GNUC_MALLOC;
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void gst_query_set_duration (GstQuery *query, GstFormat format, gint64 duration);
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void gst_query_parse_duration (GstQuery *query, GstFormat *format, gint64 *duration);
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/* latency query */
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GstQuery* gst_query_new_latency (void) G_GNUC_MALLOC;
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void gst_query_set_latency (GstQuery *query, gboolean live, GstClockTime min_latency,
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GstClockTime max_latency);
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void gst_query_parse_latency (GstQuery *query, gboolean *live, GstClockTime *min_latency,
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GstClockTime *max_latency);
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/* convert query */
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GstQuery* gst_query_new_convert (GstFormat src_format, gint64 value, GstFormat dest_format) G_GNUC_MALLOC;
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void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value,
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GstFormat dest_format, gint64 dest_value);
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void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value,
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GstFormat *dest_format, gint64 *dest_value);
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/* segment query */
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GstQuery* gst_query_new_segment (GstFormat format) G_GNUC_MALLOC;
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void gst_query_set_segment (GstQuery *query, gdouble rate, GstFormat format,
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gint64 start_value, gint64 stop_value);
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void gst_query_parse_segment (GstQuery *query, gdouble *rate, GstFormat *format,
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gint64 *start_value, gint64 *stop_value);
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/* application specific query */
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GstQuery * gst_query_new_application (GstQueryType type,
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GstStructure *structure) G_GNUC_MALLOC;
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GstStructure * gst_query_get_structure (GstQuery *query);
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/* seeking query */
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GstQuery* gst_query_new_seeking (GstFormat format) G_GNUC_MALLOC;
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void gst_query_set_seeking (GstQuery *query, GstFormat format,
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gboolean seekable,
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gint64 segment_start,
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gint64 segment_end);
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void gst_query_parse_seeking (GstQuery *query, GstFormat *format,
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gboolean *seekable,
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gint64 *segment_start,
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gint64 *segment_end);
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/* formats query */
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GstQuery* gst_query_new_formats (void) G_GNUC_MALLOC;
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void gst_query_set_formats (GstQuery *query, gint n_formats, ...);
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void gst_query_set_formatsv (GstQuery *query, gint n_formats, const GstFormat *formats);
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void gst_query_parse_formats_length (GstQuery *query, guint *n_formats);
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void gst_query_parse_formats_nth (GstQuery *query, guint nth, GstFormat *format);
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/* buffering query */
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GstQuery* gst_query_new_buffering (GstFormat format) G_GNUC_MALLOC;
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void gst_query_set_buffering_percent (GstQuery *query, gboolean busy, gint percent);
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void gst_query_parse_buffering_percent (GstQuery *query, gboolean *busy, gint *percent);
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void gst_query_set_buffering_stats (GstQuery *query, GstBufferingMode mode,
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gint avg_in, gint avg_out,
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gint64 buffering_left);
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void gst_query_parse_buffering_stats (GstQuery *query, GstBufferingMode *mode,
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gint *avg_in, gint *avg_out,
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gint64 *buffering_left);
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void gst_query_set_buffering_range (GstQuery *query, GstFormat format,
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gint64 start, gint64 stop,
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gint64 estimated_total);
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void gst_query_parse_buffering_range (GstQuery *query, GstFormat *format,
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gint64 *start, gint64 *stop,
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gint64 *estimated_total);
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gboolean gst_query_add_buffering_range (GstQuery *query,
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gint64 start, gint64 stop);
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guint gst_query_get_n_buffering_ranges (GstQuery *query);
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gboolean gst_query_parse_nth_buffering_range (GstQuery *query,
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guint index, gint64 *start,
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gint64 *stop);
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/* URI query */
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GstQuery * gst_query_new_uri (void) G_GNUC_MALLOC;
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void gst_query_parse_uri (GstQuery *query, gchar **uri);
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void gst_query_set_uri (GstQuery *query, const gchar *uri);
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G_END_DECLS
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#endif /* __GST_QUERY_H__ */
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