uridecodebin

uridecodebin — Autoplug and decode an URI to raw media

Synopsis

struct              GstURIDecodeBin;
enum                GstAutoplugSelectResult;

Object Hierarchy

  GObject
   +----GstObject
         +----GstElement
               +----GstBin
                     +----GstURIDecodeBin

Implemented Interfaces

GstURIDecodeBin implements GstChildProxy.

Properties

  "uri"                      gchar*                : Read / Write
  "connection-speed"         guint                 : Read / Write
  "caps"                     GstCaps*              : Read / Write
  "subtitle-encoding"        gchar*                : Read / Write
  "source"                   GstElement*           : Read
  "buffer-duration"          gint64                : Read / Write
  "buffer-size"              gint                  : Read / Write
  "download"                 gboolean              : Read / Write
  "use-buffering"            gboolean              : Read / Write
  "expose-all-streams"       gboolean              : Read / Write
  "ring-buffer-max-size"     guint64               : Read / Write

Signals

  "autoplug-continue"                              : Run Last
  "autoplug-factories"                             : Run Last
  "autoplug-select"                                : Run Last
  "unknown-type"                                   : Run Last
  "drained"                                        : Run Last
  "autoplug-sort"                                  : Run Last
  "source-setup"                                   : Run Last

Description

Decodes data from a URI into raw media. It selects a source element that can handle the given "uri" scheme and connects it to a decodebin2.

Synopsis

Element Information

plugin

uridecodebin

author

Wim Taymans <wim.taymans@gmail.com>

class

Generic/Bin/Decoder

Element Pads

name

src%d

direction

source

presence

sometimes

details

ANY

Details

struct GstURIDecodeBin

struct GstURIDecodeBin;

uridecodebin element struct


enum GstAutoplugSelectResult

typedef enum {
  GST_AUTOPLUG_SELECT_TRY,
  GST_AUTOPLUG_SELECT_EXPOSE,
  GST_AUTOPLUG_SELECT_SKIP
} GstAutoplugSelectResult;

return values for the autoplug-select signal.

GST_AUTOPLUG_SELECT_TRY

try to autoplug the current factory

GST_AUTOPLUG_SELECT_EXPOSE

expose the pad as a raw stream

GST_AUTOPLUG_SELECT_SKIP

skip the current factory

Property Details

The "uri" property

  "uri"                      gchar*                : Read / Write

URI to decode.

Default value: NULL


The "connection-speed" property

  "connection-speed"         guint                 : Read / Write

Network connection speed in kbps (0 = unknown).

Allowed values: <= 4294967

Default value: 0


The "caps" property

  "caps"                     GstCaps*              : Read / Write

The caps on which to stop decoding. (NULL = default).


The "subtitle-encoding" property

  "subtitle-encoding"        gchar*                : Read / Write

Encoding to assume if input subtitles are not in UTF-8 encoding. If not set, the GST_SUBTITLE_ENCODING environment variable will be checked for an encoding to use. If that is not set either, ISO-8859-15 will be assumed.

Default value: NULL


The "source" property

  "source"                   GstElement*           : Read

Source object used.


The "buffer-duration" property

  "buffer-duration"          gint64                : Read / Write

Buffer duration when buffering streams (-1 default value).

Allowed values: >= -1

Default value: -1


The "buffer-size" property

  "buffer-size"              gint                  : Read / Write

Buffer size when buffering streams (-1 default value).

Allowed values: >= -1

Default value: -1


The "download" property

  "download"                 gboolean              : Read / Write

Attempt download buffering when buffering network streams.

Default value: FALSE


The "use-buffering" property

  "use-buffering"            gboolean              : Read / Write

Perform buffering on demuxed/parsed media.

Default value: FALSE


The "expose-all-streams" property

  "expose-all-streams"       gboolean              : Read / Write

Expose all streams, including those of unknown type or that don't match the 'caps' property.

Default value: TRUE


The "ring-buffer-max-size" property

  "ring-buffer-max-size"     guint64               : Read / Write

Max. amount of data in the ring buffer (bytes, 0 = ring buffer disabled).

Allowed values: <= G_MAXUINT

Default value: 0

Signal Details

The "autoplug-continue" signal

gboolean            user_function                      (GstURIDecodeBin *bin,
                                                        GstPad          *pad,
                                                        GstCaps         *caps,
                                                        gpointer         user_data)      : Run Last

This signal is emitted whenever uridecodebin finds a new stream. It is emitted before looking for any elements that can handle that stream.

Note

Invocation of signal handlers stops after the first signal handler returns FALSE. Signal handlers are invoked in the order they were connected in.

bin :

The uridecodebin.

pad :

The GstPad.

caps :

The GstCaps found.

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if you wish uridecodebin to look for elements that can handle the given caps. If FALSE, those caps will be considered as final and the pad will be exposed as such (see 'new-decoded-pad' signal).

The "autoplug-factories" signal

GValueArray*        user_function                      (GstURIDecodeBin *bin,
                                                        GstPad          *pad,
                                                        GstCaps         *caps,
                                                        gpointer         user_data)      : Run Last

This function is emitted when an array of possible factories for caps on pad is needed. Uridecodebin will by default return an array with all compatible factories, sorted by rank.

If this function returns NULL, pad will be exposed as a final caps.

If this function returns an empty array, the pad will be considered as having an unhandled type media type.

Note

Only the signal handler that is connected first will ever by invoked. Don't connect signal handlers with the G_CONNECT_AFTER flag to this signal, they will never be invoked!

bin :

The uridecodebin.

pad :

The GstPad.

caps :

The GstCaps found.

user_data :

user data set when the signal handler was connected.

Returns :

a GValueArray* with a list of factories to try. The factories are by default tried in the returned order or based on the index returned by "autoplug-select".

The "autoplug-select" signal

GstAutoplugSelectResultuser_function                      (GstURIDecodeBin   *bin,
                                                        GstPad            *pad,
                                                        GstCaps           *caps,
                                                        GstElementFactory *factory,
                                                        gpointer           user_data)      : Run Last

This signal is emitted once uridecodebin has found all the possible GstElementFactory that can be used to handle the given caps. For each of those factories, this signal is emitted.

The signal handler should return a GST_TYPE_AUTOPLUG_SELECT_RESULT enum value indicating what decodebin2 should do next.

A value of GST_AUTOPLUG_SELECT_TRY will try to autoplug an element from factory.

A value of GST_AUTOPLUG_SELECT_EXPOSE will expose pad without plugging any element to it.

A value of GST_AUTOPLUG_SELECT_SKIP will skip factory and move to the next factory.

Note

Only the signal handler that is connected first will ever by invoked. Don't connect signal handlers with the G_CONNECT_AFTER flag to this signal, they will never be invoked!

bin :

The uridecodebin.

pad :

The GstPad.

caps :

The GstCaps.

factory :

A GstElementFactory to use.

user_data :

user data set when the signal handler was connected.

Returns :

a GST_TYPE_AUTOPLUG_SELECT_RESULT that indicates the required operation. The default handler will always return GST_AUTOPLUG_SELECT_TRY.

The "unknown-type" signal

void                user_function                      (GstURIDecodeBin *bin,
                                                        GstPad          *pad,
                                                        GstCaps         *caps,
                                                        gpointer         user_data)      : Run Last

This signal is emitted when a pad for which there is no further possible decoding is added to the uridecodebin.

bin :

The uridecodebin.

pad :

the new pad containing caps that cannot be resolved to a 'final'. stream type.

caps :

the GstCaps of the pad that cannot be resolved.

user_data :

user data set when the signal handler was connected.

The "drained" signal

void                user_function                      (GstURIDecodeBin *arg0,
                                                        gpointer         user_data)      : Run Last

This signal is emitted when the data for the current uri is played.

user_data :

user data set when the signal handler was connected.

The "autoplug-sort" signal

GValueArray*        user_function                      (GstURIDecodeBin *bin,
                                                        GstPad          *pad,
                                                        GstCaps         *caps,
                                                        GValueArray     *factories,
                                                        gpointer         user_data)      : Run Last

Once decodebin2 has found the possible GstElementFactory objects to try for caps on pad, this signal is emitted. The purpose of the signal is for the application to perform additional sorting or filtering on the element factory array.

The callee should copy and modify factories or return NULL if the order should not change.

Note

Invocation of signal handlers stops after one signal handler has returned something else than NULL. Signal handlers are invoked in the order they were connected in. Don't connect signal handlers with the G_CONNECT_AFTER flag to this signal, they will never be invoked!

bin :

The uridecodebin.

pad :

The GstPad.

caps :

The GstCaps.

factories :

A GValueArray of possible GstElementFactory to use.

user_data :

user data set when the signal handler was connected.

Returns :

A new sorted array of GstElementFactory objects.

Since 0.10.33


The "source-setup" signal

void                user_function                      (GstURIDecodeBin *bin,
                                                        GstElement      *source,
                                                        gpointer         user_data)      : Run Last

This signal is emitted after the source element has been created, so it can be configured by setting additional properties (e.g. set a proxy server for an http source, or set the device and read speed for an audio cd source). This is functionally equivalent to connecting to the notify::source signal, but more convenient.

bin :

the uridecodebin.

source :

source element

user_data :

user data set when the signal handler was connected.

Since 0.10.33