gstreamermm 0.10.10.1
Public Types | Public Member Functions | Protected Member Functions | Related Functions
Gst::Index Class Reference

A class that generates a stream index of one or more elements in a pipeline. More...

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List of all members.

Public Types

typedef sigc::slot< bool,
const Glib::RefPtr< Gst::Index >
&, Gst::IndexEntry
SlotFilter
 For example, bool on_filter(const Glib::RefPtr<Gst::Index>& index, Gst::IndexEntry entry);.
typedef sigc::slot< bool,
const Glib::RefPtr< Gst::Index >
&, const Glib::RefPtr
< Gst::Object >
&, Glib::ustring& > 
SlotResolver
 For example, bool on_resolve(const Glib::RefPtr<Gst::Object>& writer, Glib::ustring& writer_string);.

Public Member Functions

virtual ~Index ()
GstIndex* gobj ()
 Provides access to the underlying C GObject.
const GstIndex* gobj () const
 Provides access to the underlying C GObject.
GstIndex* gobj_copy ()
 Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.
bool is_readable () const
 Check if the index can be read from.
bool is_writable () const
 Check if the index can be written to.
void commit (int id)
 Tell the index that the writer with the given id is done with this index and is not going to write any more entries to it.
int get_group () const
 Get the id of the current group.
int new_group ()
 Create a new group for the given index.
bool set_group (int group_number)
 Set the current groupnumber to the given argument.
void set_certainty (IndexCertainty certainty)
 Set the certainty of the given index.
IndexCertainty get_certainty () const
 Get the certainty of the given index.
bool get_writer_id (const Glib::RefPtr< Gst::Object >& writer, int& id) const
 Before entries can be added to the index, a writer should obtain a unique id.
Gst::IndexEntry add_format (int id, Format format)
 Adds a format entry into the index.
Gst::IndexEntry add_association (int id, AssocFlags flags, int n, const Glib::ArrayHandle< const Gst::IndexAssociation >& list)
 Associate given format/value pairs with each other.
Gst::IndexEntry add_id (int id, const Glib::ustring& description)
 Add an id entry into the index.
Gst::IndexEntry get_assoc_entry (int id, gint64 value, IndexLookupMethod method=Gst::INDEX_LOOKUP_EXACT, AssocFlags flags=Gst::ASSOCIATION_FLAG_NONE, Format format=Gst::FORMAT_DEFAULT) const
 Finds the given format/value in the index.
void set_filter (const SlotFilter& slot)
 Lets the app register a custom filter slot so that it can select what entries should be stored in the index.
void set_resolver (const SlotResolver& slot)
 Lets the app register a custom slot to map index ids to writer descriptions.
Glib::PropertyProxy
< Gst::Index::SlotResolver
property_resolver ()
 Select a predefined object to string mapper.
Glib::PropertyProxy_ReadOnly
< Gst::Index::SlotResolver
property_resolver () const
 Select a predefined object to string mapper.
Glib::SignalProxy1< void,
const Gst::IndexEntry& > 
signal_entry_added ()
 Emitted when a new entry is added to the index.
virtual bool get_writer_id_vfunc (int& writer_id, const Glib::ustring& writer_string) const
virtual void commit_vfunc (gint id)
virtual void add_entry_vfunc (Gst::IndexEntry& entry)

Protected Member Functions

 Index ()
virtual void on_entry_added (const Gst::IndexEntry& entry)
 This is a default handler for the signal signal_entry_added().

Related Functions

(Note that these are not member functions.)

Glib::RefPtr< Gst::Indexwrap (GstIndex* object, bool take_copy=false)
 A Glib::wrap() method for this object.

Detailed Description

A class that generates a stream index of one or more elements in a pipeline.


Member Typedef Documentation

For example, bool on_filter(const Glib::RefPtr<Gst::Index>& index, Gst::IndexEntry entry);.

The filter function should return true if the entry is to be added to the index, false otherwise.

For example, bool on_resolve(const Glib::RefPtr<Gst::Object>& writer, Glib::ustring& writer_string);.

The resolve function should return true if an id could be assigned to writer.


Constructor & Destructor Documentation

virtual Gst::Index::~Index ( ) [virtual]
Gst::Index::Index ( ) [protected]

Member Function Documentation

Gst::IndexEntry Gst::Index::add_association ( int  id,
AssocFlags  flags,
int  n,
const Glib::ArrayHandle< const Gst::IndexAssociation >&  list 
)

Associate given format/value pairs with each other.

Parameters:
idThe id of the index writer.
flagsOptinal flags for this entry.
nNumber of associations.
listList of associations.
Returns:
A pointer to the newly added entry in the index.
virtual void Gst::Index::add_entry_vfunc ( Gst::IndexEntry entry) [virtual]
Gst::IndexEntry Gst::Index::add_format ( int  id,
Format  format 
)

Adds a format entry into the index.

This function is used to map dynamic GstFormat ids to their original format key.

Free-function: gst_index_entry_free

Parameters:
idThe id of the index writer.
formatThe format to add to the index.
Returns:
A pointer to the newly added entry in the index.
Gst::IndexEntry Gst::Index::add_id ( int  id,
const Glib::ustring description 
)

Add an id entry into the index.

Parameters:
idThe id of the index writer.
descriptionThe description of the index writer.
Returns:
A pointer to the newly added entry in the index.
void Gst::Index::commit ( int  id)

Tell the index that the writer with the given id is done with this index and is not going to write any more entries to it.

Parameters:
idThe writer that commited the index.
virtual void Gst::Index::commit_vfunc ( gint  id) [virtual]
Gst::IndexEntry Gst::Index::get_assoc_entry ( int  id,
gint64  value,
IndexLookupMethod  method = Gst::INDEX_LOOKUP_EXACT,
AssocFlags  flags = Gst::ASSOCIATION_FLAG_NONE,
Format  format = Gst::FORMAT_DEFAULT 
) const

Finds the given format/value in the index.

Parameters:
idThe id of the index writer.
valueThe value to find.
methodThe lookup method to use.
flagsFlags for the entry.
formatThe format of the value.
Returns:
The entry associated with the value or 0 if the value was not found.
IndexCertainty Gst::Index::get_certainty ( ) const

Get the certainty of the given index.

Returns:
The certainty of the index.
int Gst::Index::get_group ( ) const

Get the id of the current group.

Returns:
The id of the current group.
bool Gst::Index::get_writer_id ( const Glib::RefPtr< Gst::Object >&  writer,
int &  id 
) const

Before entries can be added to the index, a writer should obtain a unique id.

The methods to add new entries to the index require this id as an argument.

The application can implement a custom function to map the writer object to a string. That string will be used to register or look up an id in the index.

<note> The caller must not hold writer's Gst::OBJECT_LOCK, as the default resolver may call functions that take the object lock as well, and the lock is not recursive. </note>

Parameters:
writerThe GstObject to allocate an id for.
idA pointer to a int to hold the id.
Returns:
true if the writer would be mapped to an id.
virtual bool Gst::Index::get_writer_id_vfunc ( int &  writer_id,
const Glib::ustring writer_string 
) const [virtual]
const GstIndex* Gst::Index::gobj ( ) const [inline]

Provides access to the underlying C GObject.

Reimplemented from Gst::Object.

GstIndex* Gst::Index::gobj ( ) [inline]

Provides access to the underlying C GObject.

Reimplemented from Gst::Object.

GstIndex* Gst::Index::gobj_copy ( )

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

Reimplemented from Gst::Object.

bool Gst::Index::is_readable ( ) const

Check if the index can be read from.

Returns:
true if index is readable, false otherwise.
bool Gst::Index::is_writable ( ) const

Check if the index can be written to.

Returns:
true if index is writable, false otherwise.
int Gst::Index::new_group ( )

Create a new group for the given index.

It will be set as the current group.

Returns:
The id of the newly created group.
virtual void Gst::Index::on_entry_added ( const Gst::IndexEntry entry) [protected, virtual]

This is a default handler for the signal signal_entry_added().

Glib::PropertyProxy< Gst::Index::SlotResolver > Gst::Index::property_resolver ( )

Select a predefined object to string mapper.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.
Glib::PropertyProxy_ReadOnly< Gst::Index::SlotResolver > Gst::Index::property_resolver ( ) const

Select a predefined object to string mapper.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.
void Gst::Index::set_certainty ( IndexCertainty  certainty)

Set the certainty of the given index.

Parameters:
certaintyThe certainty to set.
void Gst::Index::set_filter ( const SlotFilter slot)

Lets the app register a custom filter slot so that it can select what entries should be stored in the index.

Parameters:
slotThe filter slot to register.
bool Gst::Index::set_group ( int  group_number)

Set the current groupnumber to the given argument.

Parameters:
groupnumThe groupnumber to set.
Returns:
true if the operation succeeded, false if the group did not exist.
void Gst::Index::set_resolver ( const SlotResolver slot)

Lets the app register a custom slot to map index ids to writer descriptions.

Parameters:
slotThe resolver slot to register.
Glib::SignalProxy1< void,const Gst::IndexEntry& > Gst::Index::signal_entry_added ( )

Emitted when a new entry is added to the index.

Slot Prototype:
void on_my_entry_added(const Gst::IndexEntry& entry)

Friends And Related Function Documentation

Glib::RefPtr< Gst::Index > wrap ( GstIndex *  object,
bool  take_copy = false 
) [related]

A Glib::wrap() method for this object.

Parameters:
objectThe C instance.
take_copyFalse if the result should take ownership of the C instance. True if it should take a new copy or ref.
Returns:
A C++ instance that wraps this C instance.

The documentation for this class was generated from the following file: