unhvd-native Unity Network Hardware Video Decoder Native library

Library intended as Unity native plugin for:

• video streaming over custom MLSP protocol
• hardware decoding
• depth to point cloud unprojection

See UNHVD for Unity project using this library.

See hardware-video-streaming for other related projects.

The intent behind library:

• minimize video latency
• minimize CPU usage (hardware decoding and color conversions)
• multi-frame streaming (e.g. depth + texture)
• simple interface for interfacing from Unity

Unity calls Update function once per frame, preparing data for rendering. If you have other workflow it may be difficult for you to use the library directly. In such case have a look at NHVD.

Platforms

Unix-like operating systems (e.g. Linux).

The dependency is indirectly through NHVD.

Tested on Ubuntu 18.04.

Hardware

Tested with:

• Intel VAAPI compatible hardware decoders (Quick Sync Video)
• AMD/ATI VAAPI compatible hardware decoders
• VDPAU compatible hardware decoders (e.g. Nvidia GPU)

Also implemented (but not tested):

• DirectX 9 Video Acceleration (dxva2)
• DirectX 11 Video Acceleration (d3d11va)
• VideoToolbox

Dependencies

Library depends on:

• NHVD Hardware Video Decoder
  • FFmpeg avcodec and avutil (at least 3.4 version)
• HDU Hardware Depth Unprojector

Direct dependencies are included as submodules so you only need to satifisy NHVD dependencies (FFmpeg).

Works with system FFmpeg on Ubuntu 18.04 and doesn't on 16.04 (outdated FFmpeg and VAAPI ecosystem).

Building Instructions

Tested on Ubuntu 18.04.

# update package repositories
sudo apt-get update 
# get avcodec and avutil
sudo apt-get install ffmpeg libavcodec-dev libavutil-dev
# get compilers and make 
sudo apt-get install build-essential
# get cmake - we need to specify libcurl4 for Ubuntu 18.04 dependencies problem
sudo apt-get install libcurl4 cmake
# get git
sudo apt-get install git
# clone the repository with *RECURSIVE* for submodules
git clone --recursive https://github.com/bmegli/unhvd-native.git

# finally build the shared library
cd unhvd-native
mkdir build
cd build
cmake ..
make

Testing

Assuming:

• you are using VAAPI device "/dev/dri/renderD128"
• port is 9766
• codec is h264
• pixel format is nv12

Receiving side

./unhvd-frame-example 9766 vaapi h264 nv12 /dev/dri/renderD128

Sending side

For a quick test you may use NHVE procedurally generated H.264 video (recommended).

# assuming you build NHVE, in build directory
./nhve-stream-h264 127.0.0.1 9766 10 /dev/dri/renderD128

If you have Realsense camera you may use realsense-network-hardware-video-encoder.

# assuming you build RNHVE, in build directory
./realsense-nhve-h264 127.0.0.1 9766 color 640 360 30 10 /dev/dri/renderD128

If everything went well you will:

• see hardware initialized
• collected frames info
• decoded frames size

If you have multiple vaapi devices you may have to specify correct one e.g. "/dev/dri/renderD129"

Using

See HVD docs for details about hardware configuration.

See examples directory for more complete examples.

	unhvd_hw_config hw_config= {"vaapi", "h264", "/dev/dri/renderD128", "bgr0"};
	unhvd_net_config net_config= {NULL, 9765, 500};

	unhvd *network_decoder=unhvd_init(&net_config, &hw_config, 1, NULL);

	//this is where we will get the decoded data	
	unhvd_frame frame;
	
	while(keep_working)
	{
		if( unhvd_get_frame_begin(network_decoder, &frame) == UNHVD_OK )
		{
			//...
			//do something with the:
			// - frame.width
			// - frame.height
			// - frame.format
			// - frame.data
			// - frame.linesize
			// be quick - we are holding the mutex
			// Examples:
			// - fill the texture
			// - copy for later use if you can't be quick
			//...
		}

		if( unhvd_get_frame_end(network_decoder) != UNHVD_OK )
			break; //error occured

		//this should spin once per frame rendering
		//so wait until we are after rendering
	}

	unhvd_close(network_decoder);

License

Library and my dependencies are licensed under Mozilla Public License, v. 2.0

This is similiar to LGPL but more permissive:

• you can use it as LGPL in prioprietrary software
• unlike LGPL you may compile it statically with your code

Like in LGPL, if you modify this library, you have to make your changes available. Making a github fork of the library with your changes satisfies those requirements perfectly.

Since you are linking to FFmpeg libraries consider also avcodec and avutil licensing.

Additional information

Library uses

Hardware decode & render in Unity from H.264/HEVC/HEVC Main10 network stream unity-network-hardware-video-decoder

Streaming data

You may stream Realsense camera data (sending side) from realsense-network-hardware-video-encoder