author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:03:15 +0200 | |
changeset 0 | 307788aac0a8 |
permissions | -rw-r--r-- |
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// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// This is the extra documentation for the RTP API |
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// This is the API for the SymbianOS RTP stack. |
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// To use this API, start by creating a RRtpSession |
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// A session encapsulates all RTP traffic to/from a particular port, and |
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// its associated RTCP traffic. |
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// RTP traffic from this port is modelled via the RRtpSendStream class. |
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// RTP traffic from a particular remote host is modelled via RRtpReceiveStream |
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// RRtpPacket and its subclasses RRtpSendPacket and RRtpReceivePacket are |
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// the encapsulations of the RTP packets. |
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// The API uses a R class 'cheshire cat' idiom. All the R classes in |
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// the API are handles onto resources, or you may prefer to think of |
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// them as wrappers round pointers. As such they have the following |
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// properties: |
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// - They are very lightweight and can be copied around by value. |
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// - 2 copies of the same handle are 'the same thing'; if you do something |
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// to one of them it will apply to the other. |
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// - They need to be 'opened' before they point to anactual resource, |
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// and must be closed when the resource is no longer needed. Note |
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// that in some cases, the resource is considered to be owned by |
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// another resource, so there is no need to close it. In these |
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// cases, there is no close method and this fact is clearly |
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// documented. If an R class is closed, any other copies of the |
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// same handle will become invalid as they are handles to |
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// nonexistent resources. |
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// The RTP stack relies heavily on an event model based on callback |
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// functions. This has the following advantages over alternative methods, |
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// such as signaling events via TRequestStatus objects or using mixins: |
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// - It is more flexible for the client; we can distinguish a large number |
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// of different events and allow the client to chose if they want to |
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// receive notifications about them in 1 function or many, and how they |
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// want to spread different notifications over their object structure. |
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// To give an example, a client might be interested in all SDES messages, |
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// only in some types of SDES messages or in no SDES messages, and they |
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// might want to handle these messages in different parts of the code or |
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// all in the same part. THe callback model can support all these cases. |
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// - Many other RTP APIs on other platforms use a similar concept, so |
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// creating a simialr API makes it easier to port code that originated |
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// on top of these APIs. |
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// There are 4 major concepts in the event model: |
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// - An event manager. The session, the send stream and the receive |
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// streams each have their own event manager. Callbacks registered |
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// on 1 manager don't apply to other managers. The manager is not |
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// exposed in the API. |
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// - An event. (TRtpEvent class). An event is generated when anything |
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// happens that the client might want to know about. The event can |
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// be thought of as comprising 2 numbers, the event type taken from |
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// TRtpEventType and another parameter whose meaning is event-type |
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// specific. For instance, for all the 'Fail' events it is a |
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// SymbianOS error code. Additional information might be implicitly |
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// associated with the event, but needs to be fetched from another |
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// object, for instance when processing a ErtpPacketReceived event, |
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// the RRtpReceivePacket object must be obtained from the |
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// Rrt-ReceiveStream. Events are associated with an object; for |
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// instance receive stream events are associated with a |
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// RRtpReceiveStream. There are functions on the event for |
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// obtaining that object. |
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// - A callback function. A callback function is a static function |
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// with a particular signature. Static |
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// functions are used because callback models using member |
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// functions in C++ either involve bending the rules of the |
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// language or a lot of code bloat. If a function is registered for |
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// a particular event, it will be called when that event |
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// occurs. One callback function can be associated with more than 1 |
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// callback registration. Callback functions take a pointer argument |
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// which was supplied as part of the registration; normally a |
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// static callback function in a CFoo class would take a pointer to |
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// a CFoo* and call a member function on the CFoo object that does |
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// the real work. |
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// - A callback registration. A callback registration is the thing |
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// that glues all this together. The event manager contains a |
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// number of callback registrations, each of which binds a function |
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// and pointer (normally an object) to a particular kind of |
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// event. Registrations can be bound to all events on a stream |
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// (except 'Fail' events), via the ErtpAnyEvent code, or they can |
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// be further restricted by a parameter whose meaning is event-type |
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// specific. (For instance for the ErtpSDES event, the parameter is |
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// used to express interest in only a particular SDES field.) The |
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// same callback function and object can be registered for several |
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// different registrations, possibly even on different streams. |
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// So to use the event model, decide which events you care about, decide |
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// which objects care about those events, and register functions in all |
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// those objects to be told about all the events. |
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// If an event leaves, an Fail event will be generated with the leave |
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// code. Handlers for error events must not leave, as this would |
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// result in an infinite loop if allwed. It is reccomended that error |
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// events are handled by a separate callback to other events, to avoid |
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// confusion about whether leaves are allowed. (This is why callbacks |
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// registered for ErtpAnyEvent don't get called back for Fail events) |
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102 |
// One-shot event registrations are registrations that are only called |
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103 |
// back once. For instance, an application might want to display the |
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// NAME SDES parameter but might only need to be told what it is when |
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// the first one arrives. A one-shot resistration will only be called |
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// back for the first NAME received. |
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// To register events, use one of the RegisterEventCallbackL |
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// functions. These are template functions that are available in |
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// global and member-function versions. The reason for this is |
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// limitations in the handling of template member functions in MSVC6; |
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// in many situations calls to the member functions won't compile and |
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// the global functions should be used instead. |
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// Note that there are always a pair of functions; one doesn't take |
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// the 'aParameter' parameter, and defaults it to |
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// KRtpNoParameter. This is more efficient as the parameter is often |
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// not used. |
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// The callback function takes a pointer which can be of any type. |
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// The RegisterEventCallbackL functions are all templated so that the |
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// pointer you supply must be of the same type as the function |
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// expects. |
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// As RTP/RTCP is removable from ROM using the SYMBIAN_EXCLUDE_RTP_RTCP |
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// in the build rom command a stub is used to prevent linking failures. |
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// The "#ifdef RTP_Removed" is used to reduce the overhead of having an extra set of cpp files to create the |
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// stub. Using "#ifdef RTP_Removed" the MMP files create an extra set of stubbed |
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// dlls from the one cpp file. The iby file then exports the complete or stubbed dlls depending on the |
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// SYMBIAN_EXCLUDE macro. |
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// The Open session functions leave with KErrNotSuported when the stub is used. Functions |
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// which can not leave ASSERT in debug mode as should not have been called since the Open and similar |
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// functions should have 'left'. |
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// |
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// |
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132 |
|
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/** |
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@mainpage Symbian RTP API |
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The RTP stack's event model is described in the section '@ref Events' |
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@page Events The Event Model |
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@page Stub of RTP API with #ifdef RTP_Removed |
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*/ |