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rtp: gccbwe: don't break downstream assumptions pushing buffer lists

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Some elements in the RTP stack assume all buffers in a `gst::BufferList`
correspond to the same timestamp. See in [`rtpsession`] for instance.
This also had the effect that `rtpsession` did not create correct RTCP as it
only saw some of the SSRCs in the stream.

`rtpgccbwe` formed a packet group by gathering buffers in a `gst::BufferList`,
regardless of whether they corresponded to the same timestamp, which broke
synchronization under certain circonstances.

This commit makes `rtpgccbwe` push the buffers as they were received: one by one.

[`rtpsession`]: bc858976db/subprojects/gst-plugins-good/gst/rtpmanager/gstrtpsession.c (L2462)

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1502>
This commit is contained in:
François Laignel 2024-03-20 16:23:26 +01:00 committed by GStreamer Marge Bot
parent 2b9272c7eb
commit cc7b7d508d
1 changed files with 16 additions and 7 deletions
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23
net/rtp/src/gcc/imp.rs
View file

@ -19,6 +19,7 @@
*/
use gst::{glib, prelude::*, subclass::prelude::*};
use once_cell::sync::Lazy;
use smallvec::SmallVec;
use std::{
collections::{BTreeMap, VecDeque},
fmt,
@ -29,6 +30,7 @@ use std::{
use time::Duration;
type Bitrate = u32;
type BufferList = SmallVec<[gst::Buffer; 10]>;
const DEFAULT_MIN_BITRATE: Bitrate = 1000;
const DEFAULT_ESTIMATED_BITRATE: Bitrate = 2_048_000;
@ -748,7 +750,7 @@ impl Default for State {
impl State {
// 4. sending engine implementing a "leaky bucket"
fn create_buffer_list(&mut self, bwe: &super::BandwidthEstimator) -> gst::BufferList {
fn create_buffer_list(&mut self, bwe: &super::BandwidthEstimator) -> BufferList {
let now = time::Instant::now();
let elapsed = now - self.last_push;
let mut budget = (elapsed.whole_nanoseconds() as i64)
@ -762,8 +764,8 @@ impl State {
let mut remaining = self.buffers.iter().map(|b| b.size() as f64).sum::<f64>() * 8.;
let total_size = remaining;
let mut list = gst::BufferList::new();
let mutlist = list.get_mut().unwrap();
let mut list_size = 0;
let mut list = BufferList::new();
// Leak the bucket so it can hold at most 30ms of data
let maximum_remaining_bits = 30. * self.estimated_bitrate as f64 / 1000.;
@ -773,7 +775,8 @@ impl State {
let n_bits = buf.size() * 8;
leaked = budget <= 0 && remaining > maximum_remaining_bits;
mutlist.add(buf);
list_size += buf.size();
list.push(buf);
budget -= n_bits as i64;
remaining -= n_bits as f64;
}
@ -786,7 +789,7 @@ impl State {
human_kbits(self.estimated_bitrate),
human_kbits(budget as f64),
human_kbits(total_budget as f64),
human_kbits(list.calculate_size() as f64 * 8.),
human_kbits(list_size as f64 * 8.),
human_kbits(remaining),
human_kbits(total_size)
);
@ -1026,8 +1029,14 @@ pub struct BandwidthEstimator {
}
impl BandwidthEstimator {
fn push_list(&self, list: gst::BufferList) -> Result<gst::FlowSuccess, gst::FlowError> {
let res = self.srcpad.push_list(list);
fn push_list(&self, list: BufferList) -> Result<gst::FlowSuccess, gst::FlowError> {
let mut res = Ok(gst::FlowSuccess::Ok);
for buf in list {
res = self.srcpad.push(buf);
if res.is_err() {
break;
}
}
self.state.lock().unwrap().flow_return = res;