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# Gst-nvjpegdec

The Gst-nvjpegdec plugin decodes images on both dGPU and Jetson platforms. It is the preferred method for decoding JPEG images.
On the dGPU platform this plugin is based on the `libnvjpeg` library, part of the CUDA toolkit. On Jetson it uses a platform-specific hardware accelerator.
The plugin uses an internal software parser to parse JPEG streams. Thus, there is no need to use a `jpegparse` open source plugin separately to parse the encoded frame.
The plugin accepts a JPEG encoded bitstream. It produces RGB(NVMM) output on the dGPU platform. For Jetson platform, it can produce I420 as (RAW and NVMM) and GRAY8/NV12/YUY2/Y42B/Y444/RGBA as NVMM. This plugin is not applicable
on (ARM + dGPU) platforms like arm-sbsa. Use nvimagedec plugin instead. OSS nvjpegdec plugin may be listed in these platforms, but don't use that.

> **Note**
>
> As a pre-requisite for Jetson, the library `libnvjpeg.so.13` should be present in the BSP. If the [CUDA Toolkit 13.0](https://developer.nvidia.com/cuda-13-0-0-download-archive) is installed, it will be part of it.

## Inputs and Outputs

* Inputs

  * Elementary JPEG

* Output

  * Gst Buffer with decoded output in RGB format for dGPU, and I420/GRAY8/NV12/YUY2/Y42B/Y444/RGBA format for Jetson

## Features

The following table summarizes the features of the Gst-nvjpegdec plugin.

**Gst-nvjpegdec plugin features**

| Feature               | Description | Release |
| --------------------- | ----------- | ------- |
| Supports JPEG Decode  | —           | DS 4.0  |
| Supports MJPEG Decode | —           | DS 4.0  |

## Gst Properties

The following table summarizes the Gst properties of the Gst-nvjpegdec plugin.

**Gst-nvjpegdec plugin gst properties**

| Property          | Meaning                                         | Type and Range                                                                                                                                                                                    | Example and Notes            | Platforms     |
| ----------------- | ----------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- | ------------- |
| Enableperf        | Enable decode time measurement                  | Boolean                                                                                                                                                                                           | Default: false               | dGPU + Jetson |
| gpu-id            | Set GPU Device ID for operation                 | Unsigned Integer 0 to 4294967295                                                                                                                                                                  | Default: 0                   | dGPU + Jetson |
| idct-method       | The IDCT algorithm to use                       | Enum "GstNvIDCTMethod 0: islow (Slow but accurate integer algorithm) 1: ifast (Faster, less accurate integer method) 2: float (Floating-point: accurate, fast on fast HW)                         | Default: 1 (ifast)           | dGPU + Jetson |
| mjpegdecode       | Enable mjpeg decoder path for decode operations | Boolean                                                                                                                                                                                           | Default: true                | Jetson        |
| needs-buffer-pool | Needs buffer pool                               | Boolean                                                                                                                                                                                           | Default: true                | Jetson        |
| nv12output        | Enable nv12 output for i420 input               | Boolean                                                                                                                                                                                           | Default: false               | Jetson        |
| out-mem-type      | Set decoder output memory type                  | Enum "DecMemType 0: memtype_default (Memory type Default) 1: memtype_pinned (Memory type Host Pinned) 2: memtype_device (Memory type Device) 4: memtype_surface_array (Memory type Surface Array) | Default: 0 (memtype_default) | Jetson        |
| rgbaoutput        | Enable rgba output                              | Boolean                                                                                                                                                                                           | Default: false               | Jetson        |
| yuy2output        | Enable yuy2 output for yuv422 input             | Boolean                                                                                                                                                                                           | Default: false               | Jetson        |