CAF -Streaming Support Overview

CAF Streaming -Support component comprises a framework that provides interfaces for managing Digital -Rights Management (DRM) protected streamed data.

Purpose

CAF streaming framework provides interfaces -for applications to access DRM protected data stream using streaming agents. -A CAF streaming agent is an ECom plug-in that provides streaming DRM data support in CAF.

Device creators can -use the interfaces provided by the framework to support streaming DRM content.

Key concepts

CAF streaming agent: A CAF streaming agent is an ECom plug-in that provides streaming DRM data -support.
Key stream: A stream of data and meta-data required for decrypting encrypted media -streams.
Key stream decoder: A key stream decoder decrypts the key stream.
Data stream: A sequence of digitally encrypted packets of data (media data).
Short-term key: A key that decrypts data packets.
Long-term key: A key that encrypts short-term keys.
Cryptographic context: The key data along with its corresponding meta-data, such as algorithms -and usage parameters.
Rights Object: A file that includes long-term keys, usage rights such as the validity -and expiry dates for which the subscription is purchased and post-acquisition -rights.
Session Description Protocol (SDP): The SDP protocol specifies the properties of a streaming media session. -The protocol includes information such as audio and video encoding type, addresses -for delivering the respective streams, protection of the streamed data and -so on.

Architecture

CAF for Streaming Support handles -DRM protected key stream. The framework handles specific standards including DVB-H and OMA DRM BCAST (DRM -and SmartCard profiles) using CAF streaming agent. The CAF streaming agent -manages the key stream, but does not process the data stream.

The -agent receives a key stream containing short-term key. It checks if the received -key stream is supported and if so, associates it with an appropriate key stream -decoder for decryption and pushes the decrypted (cryptographic) context to -data processing stack such as CommsServer for processing the data stream.

The -agent and entities in the data processing stack have to be assured and maintained -for setting the cryptographic context (short-term key and relevant algorithms). -The processed data is then passed to the appropriate streaming player middleware -(audio or video device drivers) for playback or recording using Multimedia -Framework.

- CAF Streaming Support Architecture - -

For information about the set-up and tear down of streaming session, -see Streaming Session -Sequence.

APIs

The streaming CAF interfaces are defined using -the namespace StreamAccess.

- - - -Class Name -Description - - - - -

StreamAccess::CAgentKeyStreamDecoder

Represents the base class for a CAF streaming agent

- - -

StreamAccess::CKeyStreamDecoder

Allows clients to instantiate key stream decoders for short-term -key streams in protected broadcasts.

- - -

StreamAccess::CStreamAgentFactory

Represents a factory class responsible for creating instances of StreamAccess::CKeyStreamDecoder.

- - -

StreamAccess::CKeyStreamSink

Defines the abstract class for key stream sink. Key stream sink -is used for applying keys decrypted by the CAF streaming agent to their correct -destination.

- - - -

A CAF streaming agent plug-in must implement CAgentKeyStreamDecoder. -A streaming player middleware, for example the Multimedia Framework controller -(MMF controller), must use CKeyStreamDecoder. The figure -below shows the key classes of CAF streaming agent.

- Class diagram - -

Typical uses

CAF Streaming Support provides interfaces -to create an ECom based streaming agent. A streaming player middleware such -as MMF controller uses streaming agent to view and access the key stream. -For more information, see CAF -Streaming Support Tutorials .

- CAF Streaming -Support Concepts -Writing CAF -Streaming Agents + + + + + +CAF +Streaming Support Overview

CAF Streaming +Support component comprises a framework that provides interfaces for managing Digital +Rights Management (DRM) protected streamed data.

Purpose

CAF streaming framework provides interfaces +for applications to access DRM protected data stream using streaming agents. +A CAF streaming agent is an ECom plug-in that provides streaming DRM data support in CAF.

Device creators can +use the interfaces provided by the framework to support streaming DRM content.

Key concepts

CAF streaming agent: A CAF streaming agent is an ECom plug-in that provides streaming DRM data +support.
Key stream: A stream of data and meta-data required for decrypting encrypted media +streams.
Key stream decoder: A key stream decoder decrypts the key stream.
Data stream: A sequence of digitally encrypted packets of data (media data).
Short-term key: A key that decrypts data packets.
Long-term key: A key that encrypts short-term keys.
Cryptographic context: The key data along with its corresponding meta-data, such as algorithms +and usage parameters.
Rights Object: A file that includes long-term keys, usage rights such as the validity +and expiry dates for which the subscription is purchased and post-acquisition +rights.
Session Description Protocol (SDP): The SDP protocol specifies the properties of a streaming media session. +The protocol includes information such as audio and video encoding type, addresses +for delivering the respective streams, protection of the streamed data and +so on.

Architecture

CAF for Streaming Support handles +DRM protected key stream. The framework handles specific standards including DVB-H and OMA DRM BCAST (DRM +and SmartCard profiles) using CAF streaming agent. The CAF streaming agent +manages the key stream, but does not process the data stream.

The +agent receives a key stream containing short-term key. It checks if the received +key stream is supported and if so, associates it with an appropriate key stream +decoder for decryption and pushes the decrypted (cryptographic) context to +data processing stack such as CommsServer for processing the data stream.

The +agent and entities in the data processing stack have to be assured and maintained +for setting the cryptographic context (short-term key and relevant algorithms). +The processed data is then passed to the appropriate streaming player middleware +(audio or video device drivers) for playback or recording using Multimedia +Framework.

+ CAF Streaming Support Architecture + +

For information about the set-up and tear down of streaming session, +see Streaming Session +Sequence.

APIs

The streaming CAF interfaces are defined using +the namespace StreamAccess.

+ + + +Class Name +Description + + + + +

StreamAccess::CAgentKeyStreamDecoder

Represents the base class for a CAF streaming agent

+ + +

StreamAccess::CKeyStreamDecoder

Allows clients to instantiate key stream decoders for short-term +key streams in protected broadcasts.

+ + +

StreamAccess::CStreamAgentFactory

Represents a factory class responsible for creating instances of StreamAccess::CKeyStreamDecoder.

+ + +

StreamAccess::CKeyStreamSink

Defines the abstract class for key stream sink. Key stream sink +is used for applying keys decrypted by the CAF streaming agent to their correct +destination.

+ + + +

A CAF streaming agent plug-in must implement CAgentKeyStreamDecoder. +A streaming player middleware, for example the Multimedia Framework controller +(MMF controller), must use CKeyStreamDecoder. The figure +below shows the key classes of CAF streaming agent.

+ Class diagram + +

Typical uses

CAF Streaming Support provides interfaces +to create an ECom based streaming agent. A streaming player middleware such +as MMF controller uses streaming agent to view and access the key stream. +For more information, see CAF +Streaming Support Tutorials .

+ CAF Streaming +Support Concepts +Writing CAF +Streaming Agents

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