gst-plugins-rs/net/webrtc/examples/webrtc-precise-sync-send.rs

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use anyhow::{bail, Context};
use futures::prelude::*;
use gst::prelude::*;
use gst_rtp::prelude::*;
use tracing::{debug, error, info};
use url::Url;
const VIDEO_PATTERNS: [&str; 3] = ["ball", "smpte", "snow"];
#[derive(Debug, Default, Clone, clap::Parser)]
struct Args {
#[clap(long, help = "Clock type", default_value = "ntp")]
pub clock: Clock,
#[clap(
long,
help = "Maximum duration in seconds to wait for clock synchronization",
default_value = "5"
)]
pub clock_sync_timeout: u64,
#[clap(
long,
help = "Enable RFC 7273 PTP or NTP clock & RTP/clock offset signalling"
)]
pub do_clock_signalling: bool,
#[clap(long, help = "NTP server host", default_value = "pool.ntp.org")]
pub ntp_server: String,
#[clap(long, help = "PTP domain", default_value = "0")]
pub ptp_domain: u32,
#[clap(
long,
help = "Number of audio streams. Use 0 to disable audio",
default_value = "1"
)]
pub audio_streams: usize,
#[clap(
long,
help = "Number of video streams. Use 0 to disable video",
default_value = "1"
)]
pub video_streams: usize,
#[clap(long, help = "Force video caps (ex. 'video/x-h264')")]
pub video_caps: Option<String>,
#[clap(long, help = "Use RFC 6051 64-bit NTP timestamp RTP header extension.")]
pub enable_rapid_sync: bool,
#[clap(long, help = "Signalling server host", default_value = "localhost")]
pub server: String,
#[clap(long, help = "Signalling server port", default_value = "8443")]
pub port: u32,
#[clap(long, help = "use tls")]
pub use_tls: bool,
}
impl Args {
fn scheme(&self) -> &str {
if self.use_tls {
"wss"
} else {
"ws"
}
}
async fn get_synced_clock(&self) -> anyhow::Result<gst::Clock> {
debug!("Syncing to {:?}", self.clock);
// Create the requested clock and wait for synchronization.
let clock = match self.clock {
Clock::System => gst::SystemClock::obtain(),
Clock::Ntp => gst_net::NtpClock::new(None, &self.ntp_server, 123, gst::ClockTime::ZERO)
.upcast::<gst::Clock>(),
Clock::Ptp => {
gst_net::PtpClock::init(None, &[])?;
gst_net::PtpClock::new(None, self.ptp_domain)?.upcast()
}
};
let clock_sync_timeout = gst::ClockTime::from_seconds(self.clock_sync_timeout);
let clock =
tokio::task::spawn_blocking(move || -> Result<gst::Clock, gst::glib::BoolError> {
clock.wait_for_sync(clock_sync_timeout)?;
Ok(clock)
})
.await
.with_context(|| format!("Syncing to {:?}", self.clock))?
.with_context(|| format!("Syncing to {:?}", self.clock))?;
info!("Synced to {:?}", self.clock);
Ok(clock)
}
}
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, clap::ValueEnum)]
pub enum Clock {
#[default]
Ntp,
Ptp,
System,
}
#[derive(Debug, Default)]
struct App {
args: Args,
pipeline: Option<gst::Pipeline>,
}
impl App {
fn new(args: Args) -> Self {
App {
args,
..Default::default()
}
}
#[inline(always)]
fn pipeline(&self) -> &gst::Pipeline {
self.pipeline.as_ref().expect("Set in prepare")
}
async fn prepare_and_run(&mut self) -> anyhow::Result<()> {
self.prepare().await.context("Preparing")?;
self.run().await.context("Running")?;
Ok(())
}
async fn prepare(&mut self) -> anyhow::Result<()> {
debug!("Preparing");
self.pipeline = Some(gst::Pipeline::new());
self.pipeline()
.use_clock(Some(&self.args.get_synced_clock().await?));
// Set the base time of the pipeline statically to zero so that running
// time and clock time are the same and timeoverlay can be used to render
// the clock time over the video frames.
//
// This is needed for no other reasons.
self.pipeline().set_base_time(gst::ClockTime::ZERO);
self.pipeline().set_start_time(gst::ClockTime::NONE);
let signaller_url = Url::parse(&format!(
"{}://{}:{}",
self.args.scheme(),
self.args.server,
self.args.port,
))?;
let webrtcsink = gst::ElementFactory::make("webrtcsink")
// See:
// * https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/issues/497
// * https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3301
.property("do-fec", false)
.property("do-clock-signalling", self.args.do_clock_signalling)
.build()
.context("Creating webrtcsink")?;
self.pipeline().add(&webrtcsink).unwrap();
let signaller = webrtcsink.property::<gst::glib::Object>("signaller");
signaller.set_property("uri", signaller_url.as_str());
signaller.connect("webrtcbin-ready", false, |args| {
let webrtcbin = args[2].get::<gst::Element>().unwrap();
let rtpbin = webrtcbin
.downcast_ref::<gst::Bin>()
.unwrap()
.by_name("rtpbin")
.unwrap();
// Use local pipeline clock time as RTP NTP time source instead of using
// the local wallclock time converted to the NTP epoch.
rtpbin.set_property_from_str("ntp-time-source", "clock-time");
// Use the capture time instead of the send time for the RTP / NTP timestamp
// mapping. The difference between the two options is the capture/encoder/etc.
// latency that is introduced before sending.
rtpbin.set_property("rtcp-sync-send-time", false);
None
});
webrtcsink.connect("encoder-setup", true, |args| {
let enc = args[3].get::<gst::Element>().unwrap();
if enc.is::<gst_audio::AudioEncoder>() {
// Make sure the audio encoder tracks upstream timestamps.
enc.set_property("perfect-timestamp", false);
}
Some(true.to_value())
});
if self.args.enable_rapid_sync {
webrtcsink.connect("payloader-setup", false, |args| {
let payloader = args[3].get::<gst::Element>().unwrap();
// Add RFC6051 64-bit NTP timestamp RTP header extension.
let hdr_ext = gst_rtp::RTPHeaderExtension::create_from_uri(
"urn:ietf:params:rtp-hdrext:ntp-64",
)
.expect("Creating NTP 64-bit RTP header extension");
hdr_ext.set_id(1);
payloader.emit_by_name::<()>("add-extension", &[&hdr_ext]);
Some(true.into())
});
}
for idx in 0..self.args.audio_streams {
let audiosrc = gst::ElementFactory::make("audiotestsrc")
.property("is-live", true)
.property("freq", (idx + 1) as f64 * 440.0)
.property("volume", 0.2f64)
.build()
.context("Creating audiotestsrc")?;
self.pipeline().add(&audiosrc).context("Adding audiosrc")?;
audiosrc
.link_pads(None, &webrtcsink, Some("audio_%u"))
.context("Linking audiosrc")?;
}
for idx in 0..self.args.video_streams {
let videosrc = gst::ElementFactory::make("videotestsrc")
.property("is-live", true)
.property_from_str("pattern", VIDEO_PATTERNS[idx % VIDEO_PATTERNS.len()])
.build()
.context("Creating videotestsrc")?;
let video_overlay = gst::ElementFactory::make("timeoverlay")
.property_from_str("time-mode", "running-time")
.build()
.context("Creating timeoverlay")?;
self.pipeline()
.add_many([&videosrc, &video_overlay])
.expect("adding video elements");
videosrc
.link_filtered(
&video_overlay,
&gst::Caps::builder("video/x-raw")
.field("width", 800i32)
.field("height", 600i32)
.build(),
)
.context("Linking videosrc to timeoverlay")?;
video_overlay
.link_pads(None, &webrtcsink, Some("video_%u"))
.context("Linking video overlay")?;
}
if let Some(ref video_caps) = self.args.video_caps {
webrtcsink.set_property("video-caps", &gst::Caps::builder(video_caps).build());
}
Ok(())
}
async fn run(&mut self) -> anyhow::Result<()> {
debug!("Running");
let bus = self.pipeline().bus().context("Getting the pipeline bus")?;
let mut bus_stream = bus.stream();
self.pipeline()
.call_async_future(|pipeline| pipeline.set_state(gst::State::Playing))
.await
.context("Setting pipeline to Playing")?;
while let Some(bus_msg) = bus_stream.next().await {
use gst::MessageView::*;
match bus_msg.view() {
Error(msg) => {
let err = msg.error();
let src_name = msg.src().map(|src| src.name());
bail!(
"Element {} error message: {err:#}",
src_name.as_deref().unwrap_or("UNKNOWN"),
);
}
Latency(msg) => {
info!(
"Latency requirements have changed for element {}",
msg.src()
.map(|src| src.name())
.as_deref()
.unwrap_or("UNKNOWN"),
);
if let Err(err) = self.pipeline().recalculate_latency() {
error!(%err, "Error recalculating latency");
}
}
_ => (),
}
}
Ok(())
}
/// Tears this `App` down and deallocates all its resources by consuming `self`.
async fn teardown(mut self) {
debug!("Tearing down");
if let Some(pipeline) = self.pipeline.take() {
let _ = pipeline
.call_async_future(|pipeline| pipeline.set_state(gst::State::Null))
.await;
}
}
}
#[tokio::main]
async fn main() -> anyhow::Result<()> {
use clap::Parser;
use tracing_subscriber::prelude::*;
let args = Args::parse();
tracing_log::LogTracer::init().context("Setting logger")?;
let env_filter = tracing_subscriber::EnvFilter::try_from_env("WEBRTC_PRECISE_SYNC_SEND_LOG")
.unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info"));
let fmt_layer = tracing_subscriber::fmt::layer()
.with_thread_ids(true)
.with_target(true)
.with_span_events(
tracing_subscriber::fmt::format::FmtSpan::NEW
| tracing_subscriber::fmt::format::FmtSpan::CLOSE,
);
let subscriber = tracing_subscriber::Registry::default()
.with(env_filter)
.with(fmt_layer);
tracing::subscriber::set_global_default(subscriber).context("Setting tracing subscriber")?;
gst::init()?;
gstrswebrtc::plugin_register_static()?;
gstrsrtp::plugin_register_static()?;
debug!("Starting");
let mut res = Ok(());
let mut app = App::new(args);
{
let ctrl_c = tokio::signal::ctrl_c().fuse();
tokio::pin!(ctrl_c);
let prepare_and_run = app.prepare_and_run().fuse();
tokio::pin!(prepare_and_run);
futures::select! {
_ctrl_c_res = ctrl_c => {
info!("Shutting down due to user request");
}
app_res = prepare_and_run => {
if let Err(ref err) = app_res {
error!("Shutting down due to application error: {err:#}");
} else {
info!("Shutting down due to application termination");
}
res = app_res;
}
}
}
app.teardown().await;
debug!("Quitting");
unsafe {
// Needed for certain tracers to write data
gst::deinit();
}
res
}