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Introduction

The purpose of this document is to simplify some of the terms, descriptions, and mechanisms of the GStreamer core. It will, initially, serve as a foundation to help model and test the GStreamer implementation in the RDK/HAL system.

This document describe the details of the following,

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• Adheres to GObject (Glib 2.0)
• Uses signals and object properties

Architecture

GST-Element

• Has one specific function (read, decode, ...)
• Has two Pads:
  1. source (output)
  2. sink (input)
• GStreamer core views elements as blocks of bytes
• Linked or chained elements create a pipeline that performs a specific task

GST-Element Pad

Is defined by two properties:

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1. Downstream : src element to sink element
2. Upstream: sink element to src element

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These 3 types of elements create a simple GST-Pipeline.

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Pipelining is an implementation technique whereby multiple instructions are overlapped in execution; it takes advantage of parallelism that exists among the actions needed to execute an instruction. 

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