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QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
Graphics
Video Capture Developer's Guide
The video capture framework provides applications the ability to capture frames from a video input source. These frames can be passed to a graphics component such as Screen for display.
Using Video Capture
The video capture framework provides applications the ability to capture frames from a video input source. These frames can be passed to a graphics component such as Screen for display.
Platform-specific considerations
Video capture may require adjustments to accommodate how different hardware platforms handle tasks such as buffer allocation.

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components & Operations
- Graphics
  - Gestures Library Reference
    The Gestures library provides gesture recognizers to detect gestures through touch events that occur when you place one or more fingers on a touch screen.
  - Image Library Reference
  - Input Events Library Reference
    The Input Events library provides the framework necessary for Screen Graphics Subsystem to communicate with your touch driver.
  - OpenWF Configuration Developer's Guide
    If you are integrating a new display, you must configure and provide the parameters of your display based on its specifications via the OpenWF Display Configuration API (Wfdcfg Library).
  - OpenWF Display Server User's Guide
    The OpenWF Display Server (wfd-server) is a resource manager that provides applications the ability to show image buffers directly to the display controller via the OpenWF Display API.
  - Screen Graphics Subsystem Developer's Guide
    QNX Screen Graphics Subsystem is a graphics framework that provides all the functionality necessary to develop interactive user experiences.
  - Video Capture Developer's Guide
    The video capture framework provides applications the ability to capture frames from a video input source. These frames can be passed to a graphics component such as Screen for display.
    - Using Video Capture
      The video capture framework provides applications the ability to capture frames from a video input source. These frames can be passed to a graphics component such as Screen for display.
      - Header files and libraries
        The video capture framework uses common and board-specific header files and libraries.
      - Implementing video capture
        Video capture involves several tasks, including reserving memory, connecting to a capture device, and releasing memory once the capture is finished.
      - Sample video capture program
        This sample video capture code can be used for reference when building an application that uses video capture.
      - Properties applied to arrays
        Some of the properties defined in the video capture API are applied to arrays. Properties applied to arrays require special attention.
      - Contexts
        Video capture uses contexts for storing and communicating information, such as frame properties.
      - Buffers
        The driver or the client application can allocate memory for video frame data buffers. Only the client application can allocate metadata buffers.
      - Platform-specific considerations
        Video capture may require adjustments to accommodate how different hardware platforms handle tasks such as buffer allocation.
      - vcapture-demo
        Demonstrate camera and video content
    - Video Capture Manager
      The Video Capture manager is based on a client/server model where an application is a client that's requesting capture services from the server (Video Capture manager).
    - Video Capture API (capture.h)
      The video capture API includes all the functions, data structures, and constants needed for video capture. It does not handle video display, which should be handled by another component, such as Screen.
- Programming
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
- Utilities & Libraries
- Migrating to QNX OS 8.0
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX OS in the Amazon cloud environment.
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
QNX Hypervisor User's Guide
This User's Guide explains the QNX hypervisor architecture and provides instructions for installing and running a QNX Hypervisor system, changing system components and configuration, and using hypervisor features such as virtual devices (vdevs).
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

Platform-specific considerations

Graphics and Screen4.0 (8.x)Video Capture Developer's GuideAPIProgramming

Video capture may require adjustments to accommodate how different hardware platforms handle tasks such as buffer allocation.

Different hardware platforms handle tasks differently. To accommodate these differences, you may need to make adjustments to how your system handles video capture.

For example, we found that on some boards an unstable capture link could cause apparently random system crashes:

The capture buffers are allocated by the WFD driver, which usually allocates buffers with the size specified by the application.
Some synchronization data could be lost due to the unstable link, which causes the hardware to write data beyond the buffer boundary, with suprising results.

The only restrictions our application could impose on the hardware were maximum frame height and maximum frame width, selected from a limited set of values. To solve the problem caused by the unstable capture link, we changed the WFD driver to allocate the capture buffer of a size equal to the maximum frame height times the maximum frame width (CAPTURE_PROPERTY_DST_HEIGHT * CAPTURE_PROPERTY_DST_WIDTH).

For more information about buffer properties, see Destination buffer properties.

Page updated: March 05, 2025