OpenMAX IL Content Pipe Interface Overview

Purpose

The OpenMAX IL Content Pipe interface is an ECom plug-in.

OpenMAX IL Content Pipe interface (entry point) is provided as a static library, and the ECom implementation is defined as a macro to allow OpenMAX IL Content Pipe to be built as an ECom plug-in with very little overhead.

OpenMAX IL Content Pipe Interface library details

For Symbian OpenMAX IL Content Pipe functionality you must adapt the following static library file.

Architectural relationship

The OpenMAX IL Content Pipe interface is accessed by OpenMAX IL Core as an ECom plugin, to pull the content data in or to push the content data out from the source or destination. For example, a local file, a remote file or a broadcast.

The OpenMAX IL Content Pipe interface is implemented as an ECom plug-in in a similar approach to the OpenMAX IL Component interface.

Description

The OpenMAX IL Content Pipe interface implements the OpenMAX IL CP_PIPETYPE structure. The features of the OpenMAX IL Content Pipe interface include functions for conventional content manipulation to

• get the position from the content using CP_PIPETYPE::GetPosition()

• get a particular position in the content using CP_PIPETYPE::SetPosition()

• read data from the current position using CP_PIPETYPE::read()

• write data to the current position using CP_PIPETYPE::Write()

• allow some streaming support by implementing OpenMAX IL Content Pipe's functions, such as CP_PIPETYPE::CheckAvailableBytes(), CP_PIPETYPE::ReadBuffer(), and CP_PIPETYPE::WriteBuffer().

Key classes of the OpenMAX IL Content Pipe interface

The key classes of the OpenMAX IL Content Pipe interface are

• COmxILContentPipeIf, which is an interface to connects the content pipes to load as an ECOM plugin.

• COmxILSymbianContentPipeIf, which is the symbian implementation of the OpenMAX IL Content Pipe interface which defines the content pipe roles such as read or write access of data, checks for valid memory size of data and arrange the data in the order it is retrieved.

Using the OpenMAX IL Content Pipe interface

The OpenMAX IL Content Pipe interface is used to provide content access by implementing the data access abstraction interface define in the CP_PIPETYPE structure.