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Tp::Client::ChannelTypeStreamedMediaInterface Class Reference
Channel proxies

`#include <TelepathyQt/Channel>`

Inherits Tp::AbstractInterface.

List of all members.

## Public Slots

- QDBusPendingReply
  < Tp::MediaStreamInfoList > ListStreams (int timeout=-1)
- QDBusPendingReply RemoveStreams (const Tp::UIntList &streams, int timeout=-1)
- QDBusPendingReply RequestStreamDirection (uint streamID, uint streamDirection, int timeout=-1)
- QDBusPendingReply
  < Tp::MediaStreamInfoList > RequestStreams (uint contactHandle, const Tp::UIntList &types, int timeout=-1)

## Signals

- void StreamAdded (uint streamID, uint contactHandle, uint streamType)
- void StreamDirectionChanged (uint streamID, uint streamDirection, uint pendingFlags)
- void StreamError (uint streamID, uint errorCode, const QString &message)
- void StreamRemoved (uint streamID)
- void StreamStateChanged (uint streamID, uint streamState)

## Public Member Functions

- ChannelTypeStreamedMediaInterface (const QString &busName, const QString &objectPath, QObject *parent=0)
- ChannelTypeStreamedMediaInterface (const QDBusConnection &connection, const QString &busName, const QString &objectPath, QObject *parent=0)
- ChannelTypeStreamedMediaInterface (Tp::DBusProxy *proxy)
- ChannelTypeStreamedMediaInterface (const Tp::Client::ChannelInterface &mainInterface)
- ChannelTypeStreamedMediaInterface (const Tp::Client::ChannelInterface &mainInterface, QObject *parent)
- Tp::PendingVariant * requestPropertyInitialAudio () const
- Tp::PendingVariant * requestPropertyInitialVideo () const
- Tp::PendingVariant * requestPropertyImmutableStreams () const
- Tp::PendingVariantMap * requestAllProperties () const

## Static Public Member Functions

- static QLatin1String staticInterfaceName ()

## Protected Member Functions

- virtual void invalidate (Tp::DBusProxy *, const QString &, const QString &)

## Detailed Description

Proxy class providing a 1:1 mapping of the D-Bus interface "org.freedesktop.Telepathy.Channel.Type.StreamedMedia".

## Constructor & Destructor Documentation

Tp::Client::ChannelTypeStreamedMediaInterface::ChannelTypeStreamedMediaInterface | ( | const QString & | busName,
|  | const QString & | objectPath,
|  | QObject * | parent = `0`
| ) |  |

Creates a ChannelTypeStreamedMediaInterface associated with the given object on the session bus.

Parameters:

  busName | Name of the service the object is on.
  objectPath | Path to the object on the service.
  parent | Passed to the parent class constructor.

Tp::Client::ChannelTypeStreamedMediaInterface::ChannelTypeStreamedMediaInterface | ( | const QDBusConnection & | connection,
|  | const QString & | busName,
|  | const QString & | objectPath,
|  | QObject * | parent = `0`
| ) |  |

Creates a ChannelTypeStreamedMediaInterface associated with the given object on the given bus.

Parameters:

  connection | The bus via which the object can be reached.
  busName | Name of the service the object is on.
  objectPath | Path to the object on the service.
  parent | Passed to the parent class constructor.

Tp::Client::ChannelTypeStreamedMediaInterface::ChannelTypeStreamedMediaInterface | ( | Tp::DBusProxy * | proxy | ) |

Creates a ChannelTypeStreamedMediaInterface associated with the same object as the given proxy.

Parameters:

  proxy | The proxy to use. It will also be the QObject::parent() for this object.

Tp::Client::ChannelTypeStreamedMediaInterface::ChannelTypeStreamedMediaInterface | ( | const Tp::Client::ChannelInterface & | mainInterface | ) | `[explicit]`

Creates a ChannelTypeStreamedMediaInterface associated with the same object as the given proxy. Additionally, the created proxy will have the same parent as the given proxy.

Parameters:

  mainInterface | The proxy to use.

Tp::Client::ChannelTypeStreamedMediaInterface::ChannelTypeStreamedMediaInterface | ( | const Tp::Client::ChannelInterface & | mainInterface,
|  | QObject * | parent
| ) |  |

Creates a ChannelTypeStreamedMediaInterface associated with the same object as the given proxy. However, a different parent object can be specified.

Parameters:

  mainInterface | The proxy to use.
  parent | Passed to the parent class constructor.

## Member Function Documentation

static QLatin1String Tp::Client::ChannelTypeStreamedMediaInterface::staticInterfaceName | ( |  | ) | `[inline, static]`

Returns the name of the interface "org.freedesktop.Telepathy.Channel.Type.StreamedMedia", which this class represents.

Returns:
  The D-Bus interface name.

Tp::PendingVariant* Tp::Client::ChannelTypeStreamedMediaInterface::requestPropertyInitialAudio | ( |  | ) | const`[inline]`

Asynchronous getter for the remote object property `InitialAudio` of type `bool`.

If set to true in a channel request that will create a new channel, the connection manager should immediately attempt to establish an audio stream to the remote contact, making it unnecessary for the client to call ChannelTypeStreamedMediaInterface::RequestStreams() .

If this property, or InitialVideo, is passed to EnsureChannel (as opposed to CreateChannel), the connection manager SHOULD ignore these properties when checking whether it can return an existing channel as suitable; these properties only become significant when the connection manager has decided to create a new channel.

If true on a requested channel, this indicates that the audio stream has already been requested and the client does not need to call RequestStreams, although it MAY still do so.

If true on an unrequested (incoming) channel, this indicates that the remote contact initially requested an audio stream; this does not imply that that audio stream is still active (as indicated by ChannelTypeStreamedMediaInterface::ListStreams() ).

This property is immutable (cannot change), and therefore SHOULD appear wherever immutable properties are reported, e.g. ConnectionInterfaceRequestsInterface::NewChannels() signals.

This reduces D-Bus round trips.

Connection managers capable of signalling audio calls to contacts SHOULD include a channel class in ConnectionInterfaceRequestsInterface::RequestableChannelClasses with ChannelInterface::ChannelType = ChannelTypeStreamedMediaInterface and ChannelInterface::TargetHandleType = Contact in the fixed properties dictionary, and InitialAudio (and also InitialVideo, if applicable) in the allowed properties list. Clients wishing to discover whether a connection manager can signal audio and/or video calls SHOULD use this information.

Not all protocols support signalling video calls, and it would be possible (although unlikely) to have a protocol where only video, and not audio, could be signalled.

Connection managers that support the ConnectionInterfaceContactCapabilitiesInterface interface SHOULD represent the capabilities of receiving audio and/or video calls by including a channel class in a contact's capabilities with ChannelType = StreamedMedia in the fixed properties dictionary, and InitialAudio and/or InitialVideo in the allowed properties list. Clients wishing to discover whether a particular contact is likely to be able to receive audio and/or video calls SHOULD use this information.

Not all clients support video calls, and it would also be possible (although unlikely) to have a client which could only stream video, not audio.

Clients that are willing to receive audio and/or video calls SHOULD include the following among their channel classes if calling ConnectionInterfaceContactCapabilitiesInterface::UpdateCapabilities() (clients of a ChannelDispatcherInterface SHOULD instead arrange for the ChannelDispatcher to do this, by including the filters in their ClientHandlerInterface::HandlerChannelFilter properties):

- { ChannelType = StreamedMedia }
- { ChannelType = StreamedMedia, InitialAudio = true } if receiving calls with audio is supported
- { ChannelType = StreamedMedia, InitialVideo = true } if receiving calls with video is supported

Connection managers for protocols with capability discovery, like XMPP, need this information to advertise the appropriate capabilities for their protocol.

Returns:
  A pending variant which will emit finished when the property has been retrieved.

Tp::PendingVariant* Tp::Client::ChannelTypeStreamedMediaInterface::requestPropertyInitialVideo | ( |  | ) | const`[inline]`

Asynchronous getter for the remote object property `InitialVideo` of type `bool`.

The same as InitialAudio , but for a video stream. This property is immutable (cannot change).

In particular, note that if this property is false, this does not imply that an active video stream has not been added, only that no video stream was active at the time the channel appeared.

This property is the correct way to discover whether connection managers, contacts etc. support video calls; it appears in capabilities structures in the same way as InitialAudio.

Returns:
  A pending variant which will emit finished when the property has been retrieved.

Tp::PendingVariant* Tp::Client::ChannelTypeStreamedMediaInterface::requestPropertyImmutableStreams | ( |  | ) | const`[inline]`

Asynchronous getter for the remote object property `ImmutableStreams` of type `bool`.

If `True`, once streams have been requested for this channel (either by setting InitialAudio or InitialVideo when the channel is requested, or by calling RequestStreams() on a channel with no streams), a stream of a different content type cannot be added; subsequent calls to RequestStreams() that attempt to do so will fail.

If this property is missing, clients SHOULD assume that it is false, and thus that the channel's streams can be changed once the call has started.

If this property is present in the "allowed" set in all of the StreamedMedia entries in a contact's capabilities, then user interfaces MAY choose to show a separate "call" option for each class of call.

For example, once an audio-only Google Talk call has started, it is not possible to add a video stream; both audio and video must be requested at the start of the call if video is desired. User interfaces may use this pseudo-capability as a hint to display separate "Audio call" and "Video call" buttons, rather than a single "Call" button with the option to add and remove video once the call has started for contacts without this flag.

This property is immutable, and therefore SHOULD be announced in ConnectionInterfaceRequestsInterface::NewChannels() , etc.

Returns:
  A pending variant which will emit finished when the property has been retrieved.

Tp::PendingVariantMap* Tp::Client::ChannelTypeStreamedMediaInterface::requestAllProperties | ( |  | ) | const`[inline]`

Request all of the DBus properties on the interface.

Returns:
  A pending variant map which will emit finished when the properties have been retrieved.

QDBusPendingReply<Tp::MediaStreamInfoList> Tp::Client::ChannelTypeStreamedMediaInterface::ListStreams | ( | int | timeout = `-1` | ) | `[inline, slot]`

Begins a call to the D-Bus method `ListStreams` on the remote object.

Returns an array of structs representing the streams currently active within this channel. Each stream is identified by an unsigned integer which is unique for each stream within the channel.

Note that timeout is ignored as of now. It will be used once http://bugreports.qt.nokia.com/browse/QTBUG-11775 is fixed.

Parameters:

  timeout | The timeout in milliseconds.

Returns:

An array of structs containing:

- the stream identifier
- the contact handle who the stream is with (or 0 if the stream represents more than a single member)
- the type of the stream
- the current stream state
- the current direction of the stream
- the current pending send flags

QDBusPendingReply Tp::Client::ChannelTypeStreamedMediaInterface::RemoveStreams | ( | const Tp::UIntList & | streams,
|  | int | timeout = `-1`
| ) |  | `[inline, slot]`

Begins a call to the D-Bus method `RemoveStreams` on the remote object.

Request that the given streams are removed. If all streams are removed, the channel MAY close.

Clients SHOULD NOT attempt to terminate calls by removing all the streams; instead, clients SHOULD terminate calls by removing the ChannelInterfaceGroupInterface::SelfHandle from the channel, using either ChannelInterfaceGroupInterface::RemoveMembers() or ChannelInterfaceGroupInterface::RemoveMembersWithReason() .

Note that timeout is ignored as of now. It will be used once http://bugreports.qt.nokia.com/browse/QTBUG-11775 is fixed.

Parameters:

  streams | An array of stream identifiers (as defined in ListStreams)
  timeout | The timeout in milliseconds.

QDBusPendingReply Tp::Client::ChannelTypeStreamedMediaInterface::RequestStreamDirection | ( | uint | streamID,
|  | uint | streamDirection,
|  | int | timeout = `-1`
| ) |  | `[inline, slot]`

Begins a call to the D-Bus method `RequestStreamDirection` on the remote object.

Request a change in the direction of an existing stream. In particular, this might be useful to stop sending media of a particular type, or inform the peer that you are no longer using media that is being sent to you.

Depending on the protocol, streams which are no longer sending in either direction should be removed and a StreamRemoved() signal emitted. Some direction changes can be enforced locally (for example, BIDIRECTIONAL -> RECEIVE can be achieved by merely stopping sending), others may not be possible on some protocols, and some need agreement from the remote end. In this case, the MEDIA_STREAM_PENDING_REMOTE_SEND flag will be set in the StreamDirectionChanged() signal, and the signal emitted again without the flag to indicate the resulting direction when the remote end has accepted or rejected the change.

Note that timeout is ignored as of now. It will be used once http://bugreports.qt.nokia.com/browse/QTBUG-11775 is fixed.

Parameters:

  streamID | The stream identifier (as defined in ListStreams)
  streamDirection | The desired stream direction (a value of MediaStreamDirection)
  timeout | The timeout in milliseconds.

QDBusPendingReply<Tp::MediaStreamInfoList> Tp::Client::ChannelTypeStreamedMediaInterface::RequestStreams | ( | uint | contactHandle,
|  | const Tp::UIntList & | types,
|  | int | timeout = `-1`
| ) |  | `[inline, slot]`

Begins a call to the D-Bus method `RequestStreams` on the remote object.

Request that streams be established to exchange the given types of media with the given member. In general this will try and establish a bidirectional stream, but on some protocols it may not be possible to indicate to the peer that you would like to receive media, so a send-only stream will be created initially. In the cases where the stream requires remote agreement (eg you wish to receive media from them), the StreamDirectionChanged() signal will be emitted with the MEDIA_STREAM_PENDING_REMOTE_SEND flag set, and the signal emitted again with the flag cleared when the remote end has replied.

If streams of the requested types already exist, calling this method results in the creation of additional streams. Accordingly, clients wishing to have exactly one audio stream or exactly one video stream SHOULD check for the current streams using ListStreams() before calling this method.

Note that timeout is ignored as of now. It will be used once http://bugreports.qt.nokia.com/browse/QTBUG-11775 is fixed.

Parameters:

  contactHandle | A contact handle with whom to establish the streams
  types | An array of stream types (values of MediaStreamType)
  timeout | The timeout in milliseconds.

Returns:

An array of structs (in the same order as the given stream types) containing:

- the stream identifier
- the contact handle who the stream is with (or 0 if the stream represents more than a single member)
- the type of the stream
- the current stream state
- the current direction of the stream
- the current pending send flags

void Tp::Client::ChannelTypeStreamedMediaInterface::StreamAdded | ( | uint | streamID,
|  | uint | contactHandle,
|  | uint | streamType
| ) |  | `[signal]`

Represents the signal `StreamAdded` on the remote object.

Emitted when a new stream has been added to this channel. Clients SHOULD assume that the stream's Media_Stream_State is initially Disconnected.

If a connection manager needs to represent the addition of a stream whose state is already Connecting or Connected, it MUST do this by emitting StreamAdded, closely followed by StreamStateChanged() indicating a change to the appropriate state.

Historically, it was not clear from the StreamAdded signal what the state of the stream was. telepathy-spec 0.17.22 clarified this.

Similarly, clients SHOULD assume that the initial Media_Stream_Direction of a newly added stream is Receive, and that the initial Media_Stream_Pending_Send is Pending_Local_Send.

If a connection manager needs to represent the addition of a stream whose direction or pending-send differs from those initial values, it MUST do so by emitting StreamAdded, closely followed by StreamDirectionChanged() indicating a change to the appropriate direction and pending-send state.

StreamAdded doesn't itself indicate the stream's direction; this is unfortunate, but is preserved for compatibility.

This is the appropriate direction for streams added by a remote contact on existing connection managers, and does not violate user privacy by automatically sending audio or video (audio streams start off muted, video streams start off not sending). For streams added by the local user using the client receiving the signal, the true direction can also be determined from the return value of the RequestStreams() method.

Existing clients typically operate by maintaining a separate idea of the directions that they would like the streams to have, and enforcing these intended directions by calling RequestStreamDirection() whenever needed.

Parameters:

  streamID | The stream identifier (as defined in ListStreams)
  contactHandle | The contact handle who the stream is with (or 0 if it represents more than a single member)
  streamType | The stream type (a value from MediaStreamType)

void Tp::Client::ChannelTypeStreamedMediaInterface::StreamDirectionChanged | ( | uint | streamID,
|  | uint | streamDirection,
|  | uint | pendingFlags
| ) |  | `[signal]`

Represents the signal `StreamDirectionChanged` on the remote object.

Emitted when the direction or pending flags of a stream are changed.

If the MEDIA_STREAM_PENDING_LOCAL_SEND flag is set, the remote user has requested that we begin sending on this stream. RequestStreamDirection() should be called to indicate whether or not this change is acceptable.

This allows for a MSN-style user interface, "Fred has asked you to enable your webcam. (Accept | Reject)", if desired.

Parameters:

  streamID | The stream identifier (as defined in ListStreams)
  streamDirection | The new stream direction (as defined in ListStreams)
  pendingFlags | The new pending send flags (as defined in ListStreams)

void Tp::Client::ChannelTypeStreamedMediaInterface::StreamError | ( | uint | streamID,
|  | uint | errorCode,
|  | const QString & | message
| ) |  | `[signal]`

Represents the signal `StreamError` on the remote object.

Emitted when a stream encounters an error.

Parameters:

  streamID | The stream identifier (as defined in ListStreams)
  errorCode | A stream error number, one of the values of MediaStreamError
  message | A string describing the error (for debugging purposes only)

void Tp::Client::ChannelTypeStreamedMediaInterface::StreamRemoved | ( | uint | streamID | ) | `[signal]`

Represents the signal `StreamRemoved` on the remote object.

Emitted when a stream has been removed from this channel.

Parameters:

  streamID | stream_id - the stream identifier (as defined in ListStreams)

void Tp::Client::ChannelTypeStreamedMediaInterface::StreamStateChanged | ( | uint | streamID,
|  | uint | streamState
| ) |  | `[signal]`

Represents the signal `StreamStateChanged` on the remote object.

Emitted when a member's stream's state changes.

Parameters:

  streamID | The stream identifier (as defined in ListStreams)
  streamState | The new stream state (as defined in ListStreams)

void Tp::Client::ChannelTypeStreamedMediaInterface::invalidate | ( | Tp::DBusProxy * | proxy,
|  | const QString & | error,
|  | const QString & | message
| ) |  | `[protected, virtual]`

Reimplemented from Tp::AbstractInterface.