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136cfb3bed
unref and copy functions are sometimes used as function pointers for example in the case of g_hash_table_new_full as a GDestroyNotify function. Currently GstBuffer, GstEvent, GstMessage and GstQuery define their respective unref and copy functions as macros, making use of gst_mini_object_unref/copy. This approach works very well for most cases, except for some automatically generated bindings (currently Vala), where the memory management semantics are defined declaratively. The possible solutions would be to either convert all the macros into static inline function, or change the signature of gst_mini_object_unref to take a void* instead of a GstMiniObject*. Fixes bug #572480.
325 lines
11 KiB
C
325 lines
11 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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gchar *nick;
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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_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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G_CONST_RETURN GstQueryTypeDefinition*
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gst_query_type_get_details (GstQueryType type);
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GstIterator* gst_query_type_iterate_definitions (void);
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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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#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 (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 #GstData
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* structure.
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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 (gst_mini_object_copy (GST_MINI_OBJECT_CAST (q)));
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}
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/**
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* gst_query_make_writable:
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* @q: 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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#define gst_query_make_writable(q) GST_QUERY (gst_mini_object_make_writable (GST_MINI_OBJECT (q)))
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/* position query */
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GstQuery* gst_query_new_position (GstFormat format);
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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);
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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);
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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);
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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);
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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);
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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);
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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);
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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, 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);
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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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/* URI query */
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GstQuery * gst_query_new_uri (void);
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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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