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481 lines
20 KiB
C
481 lines
20 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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* 2011 Wim Taymans <wim.taymans@gmail.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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#include <gst/gstpad.h>
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#include <gst/gstallocator.h>
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#include <gst/gsttoc.h>
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G_BEGIN_DECLS
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typedef struct _GstQuery GstQuery;
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/**
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* GstQueryTypeFlags:
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* @GST_QUERY_TYPE_UPSTREAM: Set if the query can travel upstream.
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* @GST_QUERY_TYPE_DOWNSTREAM: Set if the query can travel downstream.
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* @GST_QUERY_TYPE_SERIALIZED: Set if the query should be serialized with data
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* flow.
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*
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* #GstQueryTypeFlags indicate the aspects of the different #GstQueryType
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* values. You can get the type flags of a #GstQueryType with the
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* gst_query_type_get_flags() function.
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*/
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typedef enum {
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GST_QUERY_TYPE_UPSTREAM = 1 << 0,
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GST_QUERY_TYPE_DOWNSTREAM = 1 << 1,
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GST_QUERY_TYPE_SERIALIZED = 1 << 2
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} GstQueryTypeFlags;
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/**
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* GST_QUERY_TYPE_BOTH:
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*
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* The same thing as #GST_QUERY_TYPE_UPSTREAM | #GST_QUERY_TYPE_DOWNSTREAM.
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*/
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#define GST_QUERY_TYPE_BOTH \
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(GST_QUERY_TYPE_UPSTREAM | GST_QUERY_TYPE_DOWNSTREAM)
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#define GST_QUERY_NUM_SHIFT (8)
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/**
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* GST_QUERY_MAKE_TYPE:
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* @num: the query number to create
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* @flags: the query flags
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*
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* when making custom query types, use this macro with the num and
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* the given flags
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*/
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#define GST_QUERY_MAKE_TYPE(num,flags) \
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(((num) << GST_QUERY_NUM_SHIFT) | (flags))
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#define FLAG(name) GST_QUERY_TYPE_##name
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/**
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* GstQueryType:
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* @GST_QUERY_UNKNOWN: unknown 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.
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* @GST_QUERY_CUSTOM: a custom application or element defined query.
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* @GST_QUERY_URI: query the URI of the source or sink.
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* @GST_QUERY_ALLOCATION: the buffer allocation properties
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* @GST_QUERY_SCHEDULING: the scheduling properties
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* @GST_QUERY_ACCEPT_CAPS: the accept caps query
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* @GST_QUERY_CAPS: the caps query
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* @GST_QUERY_DRAIN: wait till all serialized data is consumed downstream
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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_UNKNOWN = GST_QUERY_MAKE_TYPE (0, 0),
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GST_QUERY_POSITION = GST_QUERY_MAKE_TYPE (10, FLAG(BOTH)),
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GST_QUERY_DURATION = GST_QUERY_MAKE_TYPE (20, FLAG(BOTH)),
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GST_QUERY_LATENCY = GST_QUERY_MAKE_TYPE (30, FLAG(BOTH)),
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GST_QUERY_JITTER = GST_QUERY_MAKE_TYPE (40, FLAG(BOTH)),
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GST_QUERY_RATE = GST_QUERY_MAKE_TYPE (50, FLAG(BOTH)),
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GST_QUERY_SEEKING = GST_QUERY_MAKE_TYPE (60, FLAG(BOTH)),
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GST_QUERY_SEGMENT = GST_QUERY_MAKE_TYPE (70, FLAG(BOTH)),
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GST_QUERY_CONVERT = GST_QUERY_MAKE_TYPE (80, FLAG(BOTH)),
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GST_QUERY_FORMATS = GST_QUERY_MAKE_TYPE (90, FLAG(BOTH)),
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GST_QUERY_BUFFERING = GST_QUERY_MAKE_TYPE (110, FLAG(BOTH)),
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GST_QUERY_CUSTOM = GST_QUERY_MAKE_TYPE (120, FLAG(BOTH)),
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GST_QUERY_URI = GST_QUERY_MAKE_TYPE (130, FLAG(BOTH)),
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GST_QUERY_ALLOCATION = GST_QUERY_MAKE_TYPE (140, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
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GST_QUERY_SCHEDULING = GST_QUERY_MAKE_TYPE (150, FLAG(UPSTREAM)),
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GST_QUERY_ACCEPT_CAPS = GST_QUERY_MAKE_TYPE (160, FLAG(BOTH)),
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GST_QUERY_CAPS = GST_QUERY_MAKE_TYPE (170, FLAG(BOTH)),
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GST_QUERY_DRAIN = GST_QUERY_MAKE_TYPE (180, FLAG(DOWNSTREAM) | FLAG(SERIALIZED))
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} GstQueryType;
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#undef FLAG
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#define GST_TYPE_QUERY (gst_query_get_type())
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#define GST_IS_QUERY(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_QUERY))
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#define GST_QUERY_CAST(obj) ((GstQuery*)(obj))
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#define GST_QUERY(obj) (GST_QUERY_CAST(obj))
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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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#define GST_QUERY_TYPE_NAME(query) (gst_query_type_get_name(GST_QUERY_TYPE(query)))
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/**
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* GST_QUERY_IS_UPSTREAM:
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* @ev: the query to query
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*
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* Check if an query can travel upstream.
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*/
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#define GST_QUERY_IS_UPSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_UPSTREAM)
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/**
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* GST_QUERY_IS_DOWNSTREAM:
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* @ev: the query to query
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*
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* Check if an query can travel downstream.
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*/
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#define GST_QUERY_IS_DOWNSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_DOWNSTREAM)
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/**
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* GST_QUERY_IS_SERIALIZED:
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* @ev: the query to query
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*
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* Check if an query is serialized with the data stream.
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*/
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#define GST_QUERY_IS_SERIALIZED(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_SERIALIZED)
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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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*
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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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};
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const gchar* gst_query_type_get_name (GstQueryType type);
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GQuark gst_query_type_to_quark (GstQueryType type);
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GstQueryTypeFlags
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gst_query_type_get_flags (GstQueryType type);
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GType gst_query_get_type (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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* 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_is_writable:
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* @q: a #GstQuery
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*
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* Tests if you can safely write data into a query's structure.
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*/
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#define gst_query_is_writable(q) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (q))
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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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/**
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* gst_query_replace:
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* @old_query: (inout) (transfer full): pointer to a pointer to a #GstQuery
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* to be replaced.
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* @new_query: (allow-none) (transfer none): pointer to a #GstQuery that will
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* replace the query pointed to by @old_query.
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*
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* Modifies a pointer to a #GstQuery to point to a different #GstQuery. The
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* modification is done atomically (so this is useful for ensuring thread safety
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* in some cases), and the reference counts are updated appropriately (the old
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* query is unreffed, the new one is reffed).
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*
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* Either @new_query or the #GstQuery pointed to by @old_query may be NULL.
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*
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* Returns: TRUE if @new_query was different from @old_query
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC gboolean gst_query_replace (GstQuery **old_query, GstQuery *new_query);
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#endif
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static inline gboolean
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gst_query_replace (GstQuery **old_query, GstQuery *new_query)
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{
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return gst_mini_object_replace ((GstMiniObject **) old_query, (GstMiniObject *) new_query);
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}
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/* application specific query */
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GstQuery * gst_query_new_custom (GstQueryType type, GstStructure *structure) G_GNUC_MALLOC;
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const GstStructure *
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gst_query_get_structure (GstQuery *query);
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GstStructure * gst_query_writable_structure (GstQuery *query);
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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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/* 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_n_formats (GstQuery *query, guint *n_formats);
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void gst_query_parse_nth_format (GstQuery *query, guint nth, GstFormat *format);
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/* buffering query */
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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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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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/* allocation query */
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GstQuery * gst_query_new_allocation (GstCaps *caps, gboolean need_pool) G_GNUC_MALLOC;
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void gst_query_parse_allocation (GstQuery *query, GstCaps **caps, gboolean *need_pool);
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/* pools */
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void gst_query_add_allocation_pool (GstQuery *query, GstBufferPool *pool,
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guint size, guint min_buffers,
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guint max_buffers);
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guint gst_query_get_n_allocation_pools (GstQuery *query);
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void gst_query_parse_nth_allocation_pool (GstQuery *query, guint index,
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GstBufferPool **pool,
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guint *size, guint *min_buffers,
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guint *max_buffers);
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void gst_query_set_nth_allocation_pool (GstQuery *query, guint index,
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GstBufferPool *pool,
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guint size, guint min_buffers,
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guint max_buffers);
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/* allocators */
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void gst_query_add_allocation_param (GstQuery *query, GstAllocator *allocator,
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const GstAllocationParams *params);
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guint gst_query_get_n_allocation_params (GstQuery *query);
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void gst_query_parse_nth_allocation_param (GstQuery *query, guint index,
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GstAllocator **allocator,
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GstAllocationParams *params);
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void gst_query_set_nth_allocation_param (GstQuery *query, guint index,
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GstAllocator *allocator,
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const GstAllocationParams *params);
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/* metadata */
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void gst_query_add_allocation_meta (GstQuery *query, GType api, const GstStructure *params);
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guint gst_query_get_n_allocation_metas (GstQuery *query);
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GType gst_query_parse_nth_allocation_meta (GstQuery *query, guint index,
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const GstStructure **params);
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void gst_query_remove_nth_allocation_meta (GstQuery *query, guint index);
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gboolean gst_query_find_allocation_meta (GstQuery *query, GType api, guint *index);
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/* scheduling query */
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/**
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* GstSchedulingFlags:
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* @GST_SCHEDULING_FLAG_SEEKABLE: if seeking is possible
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* @GST_SCHEDULING_FLAG_SEQUENTIAL: if sequential access is recommended
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*
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* The different scheduling flags.
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*/
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typedef enum {
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GST_SCHEDULING_FLAG_SEEKABLE = (1 << 0),
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GST_SCHEDULING_FLAG_SEQUENTIAL = (1 << 1)
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} GstSchedulingFlags;
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GstQuery * gst_query_new_scheduling (void) G_GNUC_MALLOC;
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void gst_query_set_scheduling (GstQuery *query, GstSchedulingFlags flags,
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gint minsize, gint maxsize, gint align);
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void gst_query_parse_scheduling (GstQuery *query, GstSchedulingFlags *flags,
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gint *minsize, gint *maxsize, gint *align);
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void gst_query_add_scheduling_mode (GstQuery *query, GstPadMode mode);
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guint gst_query_get_n_scheduling_modes (GstQuery *query);
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GstPadMode gst_query_parse_nth_scheduling_mode (GstQuery *query, guint index);
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gboolean gst_query_has_scheduling_mode (GstQuery *query, GstPadMode mode);
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gboolean gst_query_has_scheduling_mode_with_flags (GstQuery * query, GstPadMode mode,
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GstSchedulingFlags flags);
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/* accept-caps query */
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GstQuery * gst_query_new_accept_caps (GstCaps *caps) G_GNUC_MALLOC;
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void gst_query_parse_accept_caps (GstQuery *query, GstCaps **caps);
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void gst_query_set_accept_caps_result (GstQuery *query, gboolean result);
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void gst_query_parse_accept_caps_result (GstQuery *query, gboolean *result);
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/* caps query */
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GstQuery * gst_query_new_caps (GstCaps *filter) G_GNUC_MALLOC;
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void gst_query_parse_caps (GstQuery *query, GstCaps **filter);
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void gst_query_set_caps_result (GstQuery *query, GstCaps *caps);
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void gst_query_parse_caps_result (GstQuery *query, GstCaps **caps);
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/* drain query */
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GstQuery * gst_query_new_drain (void) G_GNUC_MALLOC;
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G_END_DECLS
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#endif /* __GST_QUERY_H__ */
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