AlphaRTC

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Motivation

AlphaRTC is a fork of Google's WebRTC project using ML-based bandwidth estimation, delivered by the OpenNetLab team. By equipping WebRTC with a more accurate bandwidth estimator, our mission is to eventually increase the quality of transmission.

AlphaRTC replaces Google Congestion Control (GCC) with two customized congestion control interfaces, PyInfer and ONNXInfer. The PyInfer provides an opportunity to load external bandwidth estimator written by Python. The external bandwidth estimator could be based on ML framework, like PyTorch or TensorFlow, or a pure Python algorithm without any dependencies. And the ONNXInfer is an ML-powered bandwidth estimator, which takes in an ONNX model to make bandwidth estimation more accurate. ONNXInfer is proudly powered by Microsoft's ONNXRuntime.

Environment

We recommend you directly fetch the pre-provided Docker images from opennetlab.azurecr.io/alphartc or Github release

From docker registry

docker pull opennetlab.azurecr.io/alphartc
docker image tag opennetlab.azurecr.io/alphartc alphartc

From github release

wget https://github.com/OpenNetLab/AlphaRTC/releases/latest/download/alphartc.tar.gz
docker load -i alphartc.tar.gz

Ubuntu 18.04 or 20.04 is the only officially supported distro at this moment. For other distros, you may be able to compile your own binary, or use our pre-provided Docker images.

Compilation

Option 1: Docker (recommended)

To compile AlphaRTC, please refer to the following steps

Prerequisites

Make sure Docker is installed on your system and add user to docker group.

# Install Docker
curl -fsSL get.docker.com -o get-docker.sh
sudo sh get-docker.sh
sudo usermod -aG docker ${USER}

Clone the code

git clone https://github.com/OpenNetLab/AlphaRTC.git

Build Docker images
```
cd AlphaRTC
make all
```
You should then be able to see two Docker images, alphartc and alphartc-compile using sudo docker images

Option 2: Compile from Scratch

If you don't want to use Docker, or have other reasons to compile from scratch (e.g., you want a native Windows build), you may use this method.

Note: all commands below work for both Linux (sh) and Windows (pwsh), unless otherwise specified

Grab essential tools

You may follow the guide here to obtain a copy of depot_tools

Clone the repo

git clone https://github.com/OpenNetLab/AlphaRTC.git

Sync the dependencies
```
cd AlphaRTC
gclient sync
mv src/* .
```
Generate build rules

Windows users: Please use x64 Native Tools Command Prompt for VS2017. The clang version comes with the project is 9.0.0, hence incompatible with VS2019. In addition, environmental variable DEPOT_TOOLS_WIN_TOOLSCHAIN has to be set to 0 and GYP_MSVS_VERSION has to be set to 2017.
```
gn gen out/Default
```

Compile

ninja -C out/Default peerconnection_serverless

For Windows users, we also provide a GUI version. You may compile it via

ninja -C out/Default peerconnection_serverless_win_gui

Demo

AlphaRTC consists of many different components. peerconnection_serverless is an application for demo purposes that comes with AlphaRTC. It establishes RTC communication with another peer without the need of a server.

In order to run the application, you will need a configuration file in json format. The details are explained in the next chapter.

In addition to the config file, you will also need other files, such as video/audio source files and an ONNX model.

To run an AlphaRTC instance, put the config files in a directory, e.g., config_files, then mount it to an endpoint inside alphartc container

sudo docker run -v config_files:/app/config_files alphartc peerconnection_serverless /app/config_files/config.json

Since peerconnection_serverless needs two peers, you may spawn two instances (a receiver and a sender) in the same network and make them talk to each other. For more information on Docker networking, check Docker Networking

Configurations for peerconnection_serverless

This section describes required fields for the json configuration file.

serverless_connection
- sender
  - enabled: If set to true, the client will act as sender and automatically connect to receiver when launched
  - send_to_ip: The IP of serverless peerconnection receiver
  - send_to_port: The port of serverless peerconnection receiver
- receiver
  - enabled: If set to true, the client will act as receiver and wait for sender to connect.
  - listening_ip: The IP address that the socket in receiver binds and listends to
  - listening_port: The port number that the socket in receiver binds and listends to
- autoclose: The time in seconds before close automatically (always run if autoclose=0)
Note: one and only one of sender.enabled and receiver.enabled has to be true. I.e., sender.enabled XOR receiver.enabled
bwe_feedback_duration: The duration the receiver sends its estimated target rate every time(in millisecond)
video_source
- video_disabled:
  - enabled: If set to true, the client will not take any video source as input
- webcam:
  - enabled: Windows-only. If set to true, then the client will use the web camera as the video source. For Linux, please set to false
- video_file:
  - enabled: If set to true, then the client will use a video file as the video source
  - height: The height of the input video
  - width: The width of the input video
  - fps: The frames per second (FPS) of the input video
  - file_path: The file path of the input video in YUV format
- logging:
  - enabled: If set to true, the client will write log to the file specified
  - log_output_path: The out path of the log file
Note: one and only one of video_source.webcam.enabled and video_source.video_file.enabled has to be true. I.e., video_source.webcam.enabled XOR video_source.video_file.enabled
audio_source
- microphone:
  - enabled: Whether to enable microphone output or not
- audio_file:
  - enabled: Whether to enable audio file input or not
  - file_path: The file path of the input audio file in WAV format
save_to_file
- enabled: Whether to enable file saving or not
- audio:
  - file_path: The file path of the output audio file in WAV format
- video
  - width: The width of the output video file
  - height: The height of the output video file
  - fps: Frames per second of the output video file
  - file_path: The file path of the output video file in YUV format

Use PyInfer or ONNXInfer

PyInfer

The default bandwidth estimator is PyInfer, You should implement your Python class named Estimator with required methods report_states and get_estimated_bandwidth in Python file BandwidthEstimator.py and put this file in your workspace. There is an example of Estimator with fixed estimated bandwidth 1Mbps. Here is an example BandwidthEstimator.py.

class Estimator(object):
    def report_states(self, stats: dict):
        '''
        stats is a dict with the following items
        {
            "send_time_ms": uint,
            "arrival_time_ms": uint,
            "payload_type": int,
            "sequence_number": uint,
            "ssrc": int,
            "padding_length": uint,
            "header_length": uint,
            "payload_size": uint
        }
        '''
        pass

    def get_estimated_bandwidth(self)->int:
        return int(1e6) # 1Mbps

ONNXInfer

If you want to use the ONNXInfer as the bandwidth estimator, you should specify the path of onnx model in the config file. Here is an example configuration receiver.json

onnx
- onnx_model_path: The path of the onnx model

Run peerconnection_serverless

Dockerized environment

To better demonstrate the usage of peerconnection_serverless, we provide an all-inclusive corpus in examples/peerconnection/serverless/corpus. You can use the following commands to execute a tiny example. After these commands terminates, you will get outvideo.yuv and outaudio.wav.

PyInfer:

sudo docker run -d --rm -v `pwd`/examples/peerconnection/serverless/corpus:/app -w /app --name alphartc alphartc peerconnection_serverless receiver_pyinfer.json
sudo docker exec alphartc peerconnection_serverless sender_pyinfer.json

ONNXInfer:

sudo docker run -d --rm -v `pwd`/examples/peerconnection/serverless/corpus:/app -w /app --name alphartc alphartc peerconnection_serverless receiver.json
sudo docker exec alphartc peerconnection_serverless sender.json

Bare metal

If you compiled your own binary, you can also run it on your bare-metal machine.

Linux users:

Copy the provided corpus to a new directory

cp -r examples/peerconnection/serverless/corpus/* /path/to/your/runtime

Copy the essential dynanmic libraries and add them to searching directory

cp modules/third_party/onnxinfer/lib/*.so /path/to/your/dll
export LD_LIBRARY_PATH=/path/to/your/dll:$LD_LIBRARY_PATH

Start the receiver and the sender

cd /path/to/your/runtime
/path/to/alphartc/out/Default/peerconnection ./receiver.json
/path/to/alphartc/out/Default/peerconnection ./sender.json

Windows users: