This page contains information relating to an older version of ACAP. See here for the latest version.

API

Audio API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The Axaudio API allows the application to:

  • retrieve compressed or uncompressed audio in different formats, from the camera
  • send uncompressed audio to cameras with audio output
  • configure sample rates and bitrates for some compressed formats

The API supports several get methods that returns supported formats for a camera or other audio product.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S5
  • Ambarella S2L
  • i.MX 6SoloX
  • i.MX 6ULL

Version history

This API was introduced in API version earlier than 3.0.

Video capture API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The VdoStream API provides:

  • video and image stream
  • video and image capture
  • video and image configuration

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S5

Limitations

Global rotation – All platforms except ARTPEC-6 support global image source rotation. This feature is designed to utilize the hardware more efficiently. You need to take this into consideration when designing applications for multiple platforms. The Video capture API on ARTPEC-6 allows specifying the desired rotation per stream. For other chips this is a global option set when the camera is installed, and any attempt to specify capture rotation is ignored.

Version history

The VdoStream API was introduced in API version 3.0.

Axis OS version VdoStream API version New functions added
10.2 2.3.13 vdo_stream_snapshot
vdo_stream_set_framerate
vdo_channel_get_filtered
10.3 3.0.0 -
10.4 4.0.12 vdo_buffer_get_id
10.5 5.0.25 -
10.6 5.9.14 vdo_channel_set_framerate
10.7 6.13.0 vdo_frame_take_chunk
10.8 6.24.1 vdo_zipstream_profile_get_type
vdo_frame_set_header_size
10.9 6.34.16 vdo_stream_get_event
vdo_stream_get_event_fd
vdo_map_swap
10.10 7.5.22 vdo_frame_take_chunk
vdo_frame_take_chunk_ex
vdo_stream_play
10.11 7.19.2 -
10.12 8.0.15 vdo_map_get_pair32i
vdo_map_get_pair32u
vdo_map_set_pair32i
vdo_map_set_pair32u
11.0 9.0.4 -

Known issues

VdoStream has a memory leak in products with an ARTPEC chip using firmware version 10.10 or later. The issue was fixed in firmware version 10.11.65. The issue affects the vdo_buffer_get_data function.

Code examples

Capture video stream

This code example on GitHub starts a vdo stream and then illustrates how to continuously capture frames from the vdo service, access the received buffer contents as well as the frame metadata.

libvdo and larod combined

This code example on GitHub loads an image classification model to larod and then uses vdo to fetch frames of size WIDTH x HEIGHT in yuv format which are converted to interleaved rgb format and then sent to larod for inference on MODEL.

Media Capture API (deprecated)

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

Compatibility

The API supports products with the following chips:

  • ARTPEC-7
  • ARTPEC-6
  • Ambarella S5L
  • Ambarella S5
  • Ambarella S3L
  • Ambarella S2L

Version history

Media Capture API was deprecated and removed in version 3.5.

Machine learning API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

Larod provides a simple unified C API for efficiently running machine learning and image preprocessing. The purpose of Larod is to provide a unified API for all hardware platforms with very little overhead and to arbitrate between different processes (apps) requesting access to the same hardware.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • Ambarella CV25
  • Ambarella S5L

For products with a DLPU (Deep Learning Processing Unit), inference runs on the DLPU otherwise it runs on the CPU.

Version history

Larod API version ACAP API version What’s new
1.0 3.1 Larod API introduced
2.0 3.3 - Preprocessing functionality
- Handles TFLite when using firmware version 10.6 and later.
3.0 3.5 - The larodDevice struct replaces larodChip.
- Different handling of cache when using buffers.

Note We recommend using Larod version 2.0 or 3.0. Larod version 1.0 will soon be deprecated. To use Larod 1.0, define LAROD_API_VERSION_1 in your application, see Backward compatibility in Introduction to larod for app developers for more information.

Code examples

Extract and analyze output

This code example on GitHub connects to larod and loads a model, runs inference on it and then finally deletes the loaded model from larod.

libvdo and larod combined

This code example on GitHub loads an image classification model to larod and then uses vdo to fetch frames of size WIDTH x HEIGHT in yuv format which are converted to interleaved rgb format and then sent to larod for inference on MODEL.

Overlay API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The Axoverlay API is a helper library that enables an ACAP application to draw overlays in selected video streams. It has built-in support for Cairo as rendering API, as well as an open backend for any other custom rendering.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6

Version history

The Axoverlay API was introduced in API version 3.0.

Code examples

Draw plain boxes and text

This code example on GitHub shows how to draw plain boxes and text as overlays in a stream with the Axoverlay API.

Open standard APIs

Name Description Use cases Compatibility Documentation
Cairo 1.16.0 - Open-source rendering library for 2D vector graphics.
- For use with Ax_Overlay.		 - Rendering texts for internal text overlays.
- Rendering lines, bounding boxes or any vector shapes.
- Loading SVG.		 - ARTPEC-8
- ARTPEC-7
- ARTPEC-6
- Ambarella CV25
- Ambarella S5L
- Ambarella S5
- Ambarella S3L
- Ambarella S2L		 See Cairo documentation
OpenGL ES 2.0 Accelerate graphics rendering with GPU. - Rendering mask for Axis Live Privacy Shield.
- Rendering GUI for door camera with display information as PTZ or a street name.		 - ARTPEC-8
- ARTPEC-7		 See OpenGL ES documentation
OpenCL 1.2 Accelerate parallel compute with GPU. - Color conversion (e.g. as pre-processing for DL and analytics.
- Audio filter.
- Accelerates OpenCV.		 - ARTPEC-8
- ARTPEC-7
Note: GPU is disabled on some devices due to memory limitations.		 See OpenCL documentation
OpenVX 1.0 Accelerate computer vision with GPU. - perspective transform (e.g. as pre-processing for DL and analytics).
- Non real-time DL.		 - ARTPEC-8
- ARTPEC-7		 See OpenVX documentation

Version history

The open standard APIs were introduced in API version 3.0.

Parameter API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The AxParameter API allows the application to save data and application settings so that they are not lost during a restart or firmware upgrade of the Axis product.

AxParameter makes it possible to define callback functions that perform specific actions if a parameter is updated, for example if the user updates a parameter using the Axis product’s web pages.

Note Data that’s only used and altered by the application should not be handled by AxParameter. Such data can instead be handled by, for example, GLib GKeyFile.

Parameters specific to the application can be pre-configured when the application is created or be added in runtime.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S5
  • Ambarella S3L
  • Ambarella S2L
  • i.MX 6SoloX
  • i.MX 6ULL

Version history

This API was introduced in API version earlier than 3.0.

HTTP API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The AxHTTP API allows the application to act as a CGI. This is done through a socket transfer to the ACAP application. This is a useful way to provide a configuration API, or updated information from the ACAP application. The information or configuration can then be accessed in ACA through a page provided by the ACAP application.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S5
  • Ambarella S3L
  • Ambarella S2L
  • i.MX 6SoloX
  • i.MX 6ULL

Version history

This API was introduced in API version earlier than 3.0.

Event API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The Axevent API provides:

  • an interface to the event system found in Axis products.
  • applications with a mechanism for sending and receiving events.

An application can both send and receive events.

Event types

  • Stateless (Pulse) – An event that indicates that something has occurred. Typically used to trigger some action rule.
  • Stateful (State) – An event with an active and inactive state. Typically used in action rules like “record while active”.
  • Data (Application Data) – An event that includes data that needs to be processed by the consuming application such as transaction data, license plate or other dynamic data. A data event is normally not used to trigger generic action rules.

Supported Namespaces

When declaring events it is required to set a namespace. Following are the supported namespaces:

  • tnsaxis – Axis namespace to use with Axis events
  • tns1 – ONVIF namespace to use with ONVIF events

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S5
  • Ambarella S3L
  • Ambarella S2L
  • i.MX 6SoloX
  • i.MX 6ULL

Version history

Event API version ACAP API version What’s new
1.0 ACAP 2 Event API introduced
1.1 3.2 New functions:
- ax_event_new2
- ax_event_get_time_stamp2

Note

  • ax_event_new and ax_event_get_time_stamp functions are marked as deprecated from ACAP API version 3.2 because they use GTimeVal, which is deprecated in glib. Use ax_event_new2 and x_event_get_time_stamp2 instead.
  • To prevent installation of an application (using the Event API) on unsupported firmware (version 10.2 and earlier), set REQEMBDEVVERSION to 2.18 (or higher) in package.conf or manifest.json.

Code examples

Subscribe to and send event

This code example on GitHub illustrates both how to subscribe to different events and how to send an event.

Edge storage API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The AxStorage API allows the application to save and retrieve data on mounted storage devices such as SD cards and NAS (Network Attached Storage) units. An application can only modify its own files on the storage device.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S5
  • Ambarella S3L
  • Ambarella S2L
  • i.MX 6SoloX
  • i.MX 6ULL

Version history

This API was introduced in API version earlier than 3.0.

License API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

Use the LicenseKey API to validate an application license key.

A license key is a signed file, generated for a specific device ID and application ID. The ACAP Service Portal maintains both license keys and application IDs.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S5
  • Ambarella S3L
  • Ambarella S2L
  • i.MX 6SoloX
  • i.MX 6ULL

Note For ACAP applications built using manifest.json, license key handling is supported from firmware version 10.6 and later.

Version history

This API was introduced in API version earlier than 3.0.

Code examples

Status of a license key

This code example on GitHub shows how to check the status of a license key.

Serial port API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The AxSerialPort API allows the application to configure and control the external serial port on selected Axis products.

Compatibility

The API is product dependent since not all Axis products are equipped with a serial port.

The API supports the RS-232, RS-422 and RS-485 standard.

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7

Version history

This API was introduced in API version earlier than 3.0.

Pan tilt zoom API

Go to the ACAP API documentation for detailed functional descriptions and examples of this API.

The AxPTZ API allows the application to control the camera’s pan, tilt and zoom movements, to interact with the PTZ control queue and to create and delete preset positions.

Important The AXPTZ library is designed to be used with the GLib library. An application using the AXPTZ library must have a running GMainLoop.

Note The AXPTZ library has an internal reference counter. If using the pattern: create library, create library, …, call function, call function, …, destroy library, destroy library, …, the library will be thread safe. It is recommended to call the create and destroy functions once in the main thread of the application.

Compatibility

The API supports products with the following chips:

  • ARTPEC-8
  • ARTPEC-7
  • ARTPEC-6
  • Ambarella CV25
  • Ambarella S5L
  • Ambarella S3L
  • Ambarella S2L

Version history

This API was introduced in API version earlier than 3.0.

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