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Table of Contents

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.

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



Buffer

Actual media data.

A simple buffer consists of:

  • Pointers to memory objects.
  • Timestamp
  • Reference count
  • Flags

Events

Control information.

Messages

Information on elements or pipeline.

A message consist of:

  • Source
  • Type
  • Timestamp

Queries

Request for a specific stream property related to progress tracking.


GST-Element Types

  1. Source: generates data
  2. Filter: performs task on input data to send proper output data (convertors, demuxers, muxers, codecs etc)
  3. Sink: receives data

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