JPEG 编解码耗时统计

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
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1

您好，以下描述的是JPEG编解码耗时统计，请问从数据上是否合理？是否存在可优化空间？

JPEG编解码耗时统计：

  1. JPEG编码接口调用关系：NvBufSurfaceFromFd → Raw2NvBufSurface → encodeFromFd
JPEG编码耗时统计：

* ORIN/200万像素Camera: 4465.84us
* ORIN/800万像素Camera: 11747.72us
  1. JPEG解码接口调用关系：decodeToFd → NvBufSurfaceFromFd → NvBufSurface2Raw → gpuConvertI420toBGR
JPEG解码耗时统计：

* ORIN/200万像素Camera: 8962.67us
* ORIN/800万像素Camera: 28447.52us
4

Hi,
For encoding, the flow looks optimal.

For decoding, you may try like:

decodeToFd → NvBufSurfaceFromFd → NvBufSurfTransform → RGBA → convert RGBA to BGR through CUDA code

This may have further performance enhancement but you would need to implement converting RGBA to BGR through CUDA.

5

请问：从 … NvBufSurfTransform→ RGBA → convert RGBA to BGR through CUDA code，有使用示例吗？

6

Hi,
There is no existing CUDA code for converting RGBA to BGR, and you would need to implement it on your own.

9

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10

Hi,

convert_bgr.zip (4.7 KB)

md5sum convert_bgr.zip 
51ae0331b592fc8fc2204255e7f0e03f  convert_bgr.zip

Please refer to the example.
Verified environment:

  • JetPack6.1/6.2

In the zip file contain:

convert_bgr
├── jpeg_convert_bgr.cpp
└── patch
  • move patch and jpeg_convert_bgr.cpp to /usr/src/jetson_multimedia_api/samples/06_jpeg_decode/
  • execute below command
sudo git apply patch
sudo make
# save the Image with raw format
./jpeg_decode num_files 1 ${Image}.jpg ${Image} --convert-bgr
  • After above commands will generate ${Image}.bgr, and you could use YUView to check the format

Thanks