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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 QNX Neutrino 7.1.
Sensor Framework
Sensor Framework Libraries
Camera Developer's Guide
The Camera library abstracts the complexity of interfacing with a camera connected to the target board.
Camera Library Reference
camera_h264avc.h
Supported H.264/AVC video encoder parameters.
camera_h264avc_ratecontrol_t
The supported rate-control algorithms for H.264/AVC

QNX Momentics IDE User's Guide
This User's Guide describes version 7.1 of the Integrated Development Environment (IDE) that's part of the QNX Momentics 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 QNX Neutrino 7.1.
- Quickstart Guide
- OS Components & Operations
- Audio & Graphics API
- Multimedia
- Networking Middleware
- Programming
- Sensor Framework
  - Architecture
  - Getting Started
    This guide gets you started with the Sensor Framework for QNX SDP.
  - Sensor Framework Libraries
    - ADAS Library Developer's Guide
      The ADAS library facilitates the development of embedded systems that rely on sensor data.
    - Camera Developer's Guide
      The Camera library abstracts the complexity of interfacing with a camera connected to the target board.
      - Camera Library Overview
        The Camera library provides applications with an interface to interact with cameras connected to your system. The library supports up to 64 cameras but the actual limit depends on your hardware platform's limitations and resources.
      - Viewfinder Window
        By default, the Camera library creates a viewfinder window.
      - Settings on the Camera
        You can configure various settings on the camera to modify the ISO, aperture, shutter speed, framerate, resolution, format, etc.
      - Image Buffer Access
        The Camera library supports read-only and read-write access to the image from different stages in the imaging datapath. Applications access image buffers by binding callback functions or events to a particular stage of the imaging datapath. Alternatively, applications can use streams from the Screen API to access buffers. In this guide, access to the imaging datapath is referred to as image buffers.
      - External Camera Drivers
        Cameras that aren't already supported by the Sensor Framework for QNX SDP can be supported by an external camera driver library.
      - Show a Video Stream from a Camera
        You can use the Camera library to show a video stream (image buffers) from a live camera or file camera. This section shows you the basic workflow for doing so.
      - Camera Library Reference
        camera_api.h
        The main definitions and functions for the Camera Library.
        camera_encoder.h
        Functions to configure parameters for video encoding.
        camera_h264avc.h
        Supported H.264/AVC video encoder parameters.
        camera_h264avc_entropycoding_t
        The supported entropy coding methods for H.264/AVC
        camera_h264avc_level_t
        The supported levels for H.264/AVC
        camera_h264avc_parameters_t
        The supported video encoder parameters for H.264/AVC
        camera_h264avc_profile_t
        The supported profiles for H.264/AVC
        camera_h264avc_ratecontrol_t
        The supported rate-control algorithms for H.264/AVC
        camera_h264avc_slicetype_t
        The supported slice types for H.264/AVC
        camera_3a.h
        Enumerations and functions for configuring 3A algorithms (Auto Focus, Auto Exposure, Auto White Balance) for cameras.
        external_camera_api.h
        Definitions and functions to use the External Camera library.
    - Sensor Developer's Guide
      The Sensor library abstracts the complexity of interfacing with sensors and cameras connected to the target board.
  - Sensor Framework Services
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX Neutrino RTOS system and developers who want to create a QNX Neutrino resource manager free from vulnerabilities.
- Utilities & Libraries
QNX Hypervisor
The QNX Hypervisor allows you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Advanced Virtualization Frameworks User's Guide
This User's Guide is aimed at all systems integrators and developers who want to design and build embedded systems using the QNX Advanced Virtualization Frameworks.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

camera_h264avc_ratecontrol_t

The supported rate-control algorithms for H.264/AVC

Synopsis:

#include <camera/camera_h264avc.h>

typedef enum {
    CAMERA_H264AVC_RATECONTROL_NONE = 0,
    CAMERA_H264AVC_RATECONTROL_CBR,
    CAMERA_H264AVC_RATECONTROL_VBR
} camera_h264avc_ratecontrol_t;

Data:

CAMERA_H264AVC_RATECONTROL_NONE: No rate-control algorithm is used, therefore rate control is disabled (referred to as constant quality encoding).; Constant quality encoding means that the bitrate varies with the scene content but the quality stays constant.
CAMERA_H264AVC_RATECONTROL_CBR: Constant Bit Rate (CBR) encoding is used.; This control algorithm indicates that the bitrate remains constant while quality will vary. The bitrate that is maintained is specified by the CAMERA_H264AVC_BITRATE parameter.
CAMERA_H264AVC_RATECONTROL_VBR: Variable Bit Rate (VBR) encoding is used.; This control algorithm indicates that the average bitrate remains constant while quality may vary. The average bitrate that is maintained is specified by the CAMERA_H264AVC_BITRATE parameter.

Library:

libcamapi

Description:

These are the valid values for configuring the CAMERA_H264AVC_RATECONTROL parameter. Use camera_get_supported_videoencoder_parameter_values() to determine the supported values at runtime.

Page updated: March 12, 2026