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 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.
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.
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 |