gstreamermm  1.10.0
Public Member Functions | Static Public Member Functions | List of all members
Gst::QueryCaps Class Reference

A new caps query object. More...

#include <gstreamermm/query.h>

Inheritance diagram for Gst::QueryCaps:
Inheritance graph
[legend]

Public Member Functions

Glib::RefPtr< Gst::Capsparse () const
 Get the filter from the caps query. More...
 
Glib::RefPtr< Gst::Capsparse_caps_result () const
 Get the caps result from query. More...
 
void set_caps_result (const Glib::RefPtr< Gst::Caps >& caps)
 Set the caps result in query. More...
 
- Public Member Functions inherited from Gst::Query
void reference () const
 Increment the reference count for this object. More...
 
void unreference () const
 Decrement the reference count for this object. More...
 
GstQuery* gobj ()
 Provides access to the underlying C instance. More...
 
const GstQuery* gobj () const
 Provides access to the underlying C instance. More...
 
GstQuery* gobj_copy () const
 Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...
 
 Query ()=delete
 
 Query (const Query&)=delete
 
Queryoperator= (const Query&)=delete
 
Glib::RefPtr< Gst::Querycreate_writable ()
 Makes a writable query from the given query. More...
 
Gst::Structure get_structure () const
 Get the structure of a query. More...
 
QueryType get_query_type () const
 Get the Gst::QueryType of the query. More...
 
Glib::RefPtr< Gst::Querycopy ()
 Copies the given query using the copy function of the parent Gst::Structure. More...
 
- Public Member Functions inherited from Gst::MiniObject
void reference () const
 Increment the reference count for this object. More...
 
void unreference () const
 Decrement the reference count for this object. More...
 
GstMiniObject* gobj ()
 Provides access to the underlying C instance. More...
 
const GstMiniObject* gobj () const
 Provides access to the underlying C instance. More...
 
GstMiniObject* gobj_copy () const
 Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs. More...
 
 MiniObject ()=delete
 
 MiniObject (const MiniObject&)=delete
 
MiniObjectoperator= (const MiniObject&)=delete
 
 ~MiniObject ()
 
guint get_flags () const
 
void set_flags (const guint& value)
 
gint get_refcount () const
 
gint get_lockstate () const
 
bool lock (LockFlags flags)
 Lock the mini-object with the specified access mode in flags. More...
 
void unlock (LockFlags flags)
 Unlock the mini-object with the specified access mode in flags. More...
 
bool is_writable () const
 If mini_object has the LOCKABLE flag set, check if the current EXCLUSIVE lock on object is the only one, this means that changes to the object will not be visible to any other object. More...
 
Glib::RefPtr< MiniObjectcreate_writable ()
 Checks if a mini-object is writable. More...
 
void set_qdata (GQuark quark, QuarkData* data)
 This sets an opaque, named pointer on a miniobject. More...
 
QuarkDataget_qdata (GQuark quark) const
 This function gets back user data pointers stored via set_qdata(). More...
 
QuarkDatasteal_qdata (GQuark quark)
 This function gets back user data pointers stored via set_qdata() and removes the data from object without invoking its destroy() function (if any was set). More...
 
void add_finalize_notifier (const SlotFinalizer& slot)
 Adds notifier when mini object is finalized. More...
 
void remove_finalize_notifier ()
 Remove finalize notifier. More...
 

Static Public Member Functions

static Glib::RefPtr< Gst::QueryCapscreate (const Glib::RefPtr< Gst::Caps >& filter)
 Constructs a new query object for querying the caps. More...
 
- Static Public Member Functions inherited from Gst::Query
static Glib::RefPtr< Gst::Querycreate_buffering (Gst::Format format)
 Constructs a new query object for querying the buffering status of a stream. More...
 
static Glib::RefPtr< Gst::Querycreate_allocation (Glib::RefPtr< Gst::Caps > caps, bool need_pool)
 Constructs a new query object for querying the allocation properties. More...
 
static Glib::RefPtr< Gst::Querycreate_uri ()
 Constructs a new query URI query object. More...
 
static Glib::RefPtr< Gst::Querycreate_scheduling ()
 Constructs a new query object for querying the scheduling properties. More...
 
static Glib::RefPtr< Gst::Querycreate_drain ()
 Constructs a new query object for querying the drain state. More...
 
static Glib::RefPtr< Gst::Querycreate_custom (Gst::QueryType type, const Gst::Structure& structure)
 Constructs a new custom query object. More...
 
static Glib::RefPtr< Gst::Querycreate_convert (Gst::Format format, gint64 value, Gst::Format dest_format)
 Constructs a new convert query object. More...
 
static Glib::RefPtr< Gst::Querycreate_position (Gst::Format format)
 Constructs a new query stream position query object. More...
 
static Glib::RefPtr< Gst::Querycreate_duration (Gst::Format format)
 Constructs a new stream duration query object to query in the given format. More...
 
static Glib::RefPtr< Gst::Querycreate_latency ()
 Constructs a new latency query object. More...
 
static Glib::RefPtr< Gst::Querycreate_seeking (Gst::Format format)
 Constructs a new query object for querying seeking properties of the stream. More...
 
static Glib::RefPtr< Gst::Querycreate_formats ()
 Constructs a new query object for querying formats of the stream. More...
 
static Glib::RefPtr< Gst::Querycreate_segment (Gst::Format format)
 Constructs a new segment query object. More...
 
static Glib::RefPtr< Gst::Querycreate_caps (Glib::RefPtr< Gst::Caps > filter)
 Constructs a new query object for querying the caps. More...
 
static Glib::RefPtr< Gst::Querycreate_accept_caps (Glib::RefPtr< Gst::Caps > filter)
 Constructs a new query object for querying if filter are accepted. More...
 

Additional Inherited Members

- Public Types inherited from Gst::MiniObject
typedef sigc::slot< void > SlotFinalizer
 
- Protected Member Functions inherited from Gst::Query
void operator delete (void*, std::size_t)
 
- Protected Member Functions inherited from Gst::MiniObject
void operator delete (void*, std::size_t)
 
- Static Protected Member Functions inherited from Gst::Query
template<class QueryType >
static Glib::RefPtr< QueryTypewrap (GstQuery* query, bool take_copy=false)
 

Detailed Description

A new caps query object.

See create() for more details.

Member Function Documentation

◆ create()

static Glib::RefPtr<Gst::QueryCaps> Gst::QueryCaps::create ( const Glib::RefPtr< Gst::Caps >&  filter)
static

Constructs a new query object for querying the caps.

The CAPS query should return the allowable caps for a pad in the context of the element's state, its link to other elements, and the devices or files it has opened. These caps must be a subset of the pad template caps. In the NULL state with no links, the CAPS query should ideally return the same caps as the pad template. In rare circumstances, an object property can affect the caps returned by the CAPS query, but this is discouraged. For most filters, the caps returned by CAPS query is directly affected by the allowed caps on other pads. For demuxers and decoders, the caps returned by the srcpad's getcaps function is directly related to the stream data. Again, the CAPS query should return the most specific caps it reasonably can, since this helps with autoplugging.

The filter is used to restrict the result caps, only the caps matching filter should be returned from the CAPS query. Specifying a filter might greatly reduce the amount of processing an element needs to do.

Parameters
filtera filter.
Returns
The new Gst::QureyCaps.

◆ parse()

Glib::RefPtr<Gst::Caps> Gst::QueryCaps::parse ( ) const

Get the filter from the caps query.

The caps remains valid as long as query remains valid.

Returns
caps filter.

◆ parse_caps_result()

Glib::RefPtr<Gst::Caps> Gst::QueryCaps::parse_caps_result ( ) const

Get the caps result from query.

The caps remains valid as long as query remains valid.

Returns
a pointer to the caps.

◆ set_caps_result()

void Gst::QueryCaps::set_caps_result ( const Glib::RefPtr< Gst::Caps >&  caps)

Set the caps result in query.

Parameters
capsa pointer to the caps.