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gst-plugins-rs/net/webrtc/examples/README.md
François Laignel 34b791ff5e webrtc: add raw payload support 
This commit adds support for raw payloads such as L24 audio to `webrtcsink` &
`webrtcsrc`.

Most changes take place within the `Codec` helper structure:

* A `Codec` can now advertise a depayloader. This also ensures that a format
  not only can be decoded when necessary, but it can also be depayloaded in the
  first place.
* It is possible to declare raw `Codec`s, meaning that their caps are compatible
  with a payloader and a depayloader without the need for an encoder and decoder.
* Previous accessor `has_decoder` was renamed as `can_be_received` to account
  for codecs which can be handled by an available depayloader with or without
  the need for a decoder.
* New codecs were added for the following formats:
  * L24, L16, L8 audio.
  * RAW video.

The `webrtc-precise-sync` examples were updated to demonstrate streaming of raw
audio or video.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1501>
2024-07-16 19:32:02 +00:00

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webrtcsink examples

Collection of webrtcsink examples

webrtcsink-stats-server

A simple application that instantiates a webrtcsink and serves stats over websockets.

The application expects a signalling server to be running at ws://localhost:8443, similar to the usage example in the main README.

cargo run --example webrtcsink-stats-server

Once it is running, follow the instruction in the webrtcsink-stats folder to run an example client.

webrtcsink-custom-signaller

An example of custom signaller implementation, see the corresponding README for more details on code and usage.

WebRTC precise synchronization example

This example demonstrates a sender / receiver setup which ensures precise synchronization of multiple streams in a single session.

RFC 6051-style rapid synchronization of RTP streams is available as an option. Se the Instantaneous RTP synchronization... blog post for details about this mode and an example based on RTSP instead of WebRTC.

The examples can also be used for RFC 7273 NTP or PTP clock signalling and synchronization.

Finally, raw payloads (e.g. L24 audio) can be negotiated.

Note: you can have your host act as an NTP server, which can help the examples with clock synchronization. For chrony, this can be configure by editing /etc/chrony.conf and uncommenting / editing the allow entry. The examples can then be launched with --ntp-server _ip_address_.

Signaller

The example uses the default WebRTC signaller. Launch it using the following command:

cargo run --bin gst-webrtc-signalling-server --no-default-features

Receiver

The receiver awaits for new audio & video stream publishers and render the streams using auto sink elements. Launch it using the following command:

cargo r --example webrtc-precise-sync-recv --no-default-features

The default configuration should work for a local test. For a multi-host setup, see the available options:

cargo r --example webrtc-precise-sync-recv --no-default-features -- --help

E.g.: the following will force avdec_h264 over hardware decoders, activate debug logs for the receiver and connect to the signalling server at the specified address:

GST_PLUGIN_FEATURE_RANK=avdec_h264:MAX \
WEBRTC_PRECISE_SYNC_RECV_LOG=debug \
cargo r --example webrtc-precise-sync-recv --no-default-features -- \
  --server 192.168.1.22

Sender

The sender publishes audio & video test streams. Launch it using the following command:

cargo r --example webrtc-precise-sync-send --no-default-features

The default configuration should work for a local test. For a multi-host setup, to set the number of audio / video streams, to enable rapid synchronization or to force the video encoder, see the available options:

cargo r --example webrtc-precise-sync-send --no-default-features -- --help

E.g.: the following will force H264 and x264enc over hardware encoders, activate debug logs for the sender and connect to the signalling server at the specified address:

GST_PLUGIN_FEATURE_RANK=264enc:MAX \
WEBRTC_PRECISE_SYNC_SEND_LOG=debug \
cargo r --example webrtc-precise-sync-send --no-default-features -- \
  --server 192.168.1.22 --video-caps video/x-h264

The pipeline latency

The --pipeline-latency argument configures a static latency of 1s by default. This needs to be higher than the sum of the sender latency and the receiver latency of the receiver with the highest latency. As this can't be known automatically and depends on many factors, this has to be known for the overall system and configured accordingly.

The default configuration is on the safe side and favors synchronization over low latency. Depending on the use case, shorter or larger values should be used.

RFC 7273 NTP or PTP clock signalling and synchronization

For RFC 7273 NTP or PTP clock signalling and synchronization, you can use commands such as:

Receiver

cargo r --example webrtc-precise-sync-recv --no-default-features -- \
  --expect-clock-signalling

Sender

cargo r --example webrtc-precise-sync-send --no-default-features -- \
  --clock ntp --do-clock-signalling \
  --video-streams 0 --audio-streams 2

Raw payload

The sender can be instructed to send raw payloads. Note that raw payloads are not activated by default and must be selected explicitly.

This command will stream two stereo L24 streams:

cargo r --example webrtc-precise-sync-send --no-default-features -- \
  --video-streams 0 \
  --audio-streams 2 --audio-codecs L24

Launch the receiver with:

cargo r --example webrtc-precise-sync-recv --no-default-features -- \
  --audio-codecs L24

This can be used to stream multiple RAW video streams using specific CAPS for the streams and allowing fallback to VP8 & OPUS if remote doesn't support raw payloads:

cargo r --example webrtc-precise-sync-send --no-default-features -- \
  --video-streams 2 --audio-streams 1 \
  --video-codecs RAW --video-codecs VP8 --video-caps video/x-raw,format=I420,width=400 \
  --audio-codecs L24 --audio-codecs OPUS --audio-caps audio/x-raw,rate=48000,channels=2

Android

webrtcsrc based Android application

An Android demonstration application which retrieves available producers from the signaller and renders audio and video streams.

Important: in order to ease testing, this demonstration application enables unencrypted network communication. See app/src/main/AndroidManifest.xml for details.

Build the application

  • Download the latest Android prebuilt binaries from: https://gstreamer.freedesktop.org/download/
  • Uncompress / untar the package, e.g. under /opt/android/.
  • Define the GSTREAMER_ROOT_ANDROID environment variable with the directory chosen at previous step.
  • Install a recent version of Android Studio (tested with 2023.3.1.18).
  • Open the project from the folder android/webrtcsrc.
  • Have Android Studio download and install the required SDK & NDK.
  • Click the build button or build and run on the target device.
  • The resulting apk is generated under: android/webrtcsrc/app/build/outputs/apk/debug.

For more details, refer to:

Once the SDK & NDK are installed, you can use gradlew to build and install the apk (make sure the device is visible from adb):

# From the android/webrtcsrc directory
./gradlew installDebug

Install the application

Prerequisites: activate developer mode on the target device.

There are several ways to install the application:

  • The easiest is to click the run button in Android Studio.
  • You can also install the apk using adb.

Depending on your host OS, you might need to define udev rules. See: https://github.com/M0Rf30/android-udev-rules

Setup

  1. Run the Signaller from the gst-plugins-rs root directory: 
    cargo run --bin gst-webrtc-signalling-server
  2. In the Android app, tap the 3 dots button -> Settings and edit the Signaller URI.
  3. Add a producer, e.g. using gst-launch & webrtcsink or run: 
    cargo r --example webrtc-precise-sync-send
  4. Click the Refresh button on the Producer List view of the app.