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rtp: Change RtpBasePay2::ssrc_collision from AtomicU64 to Option<u32>

Browse source 
Rust targets without support for `AtomicU64` is still
somewhat common. Running

    git grep -i 'max_atomic_width: Some(32)' | wc -l

in the Rust compiler repo currently counts to 34 targets.

Change the `RtpBasePay2::ssrc_collision` from `AtomicU64` to
`Mutex<Option<u32>>`. This way we keep support for these
targets.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1562>
This commit is contained in:
Martin Nordholts 2024-05-07 15:54:16 +02:00 committed by GStreamer Marge Bot
parent 7d75e263f8
commit a719cbfcc6
1 changed files with 18 additions and 16 deletions
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34
net/rtp/src/basepay/imp.rs
View file

@ -18,10 +18,7 @@ use std::{
collections::{BTreeMap, VecDeque},
num::Wrapping,
ops::{Bound, RangeBounds},
sync::{
atomic::{self, AtomicU64},
Mutex,
},
sync::Mutex,
};
use super::PacketToBufferRelation;
@ -184,10 +181,9 @@ pub struct RtpBasePay2 {
settings: Mutex<Settings>,
stats: Mutex<Option<Stats>>,
/// If set to a different value than `u64::MAX` then there
/// was an SSRC collision and we should switch to the provided
/// SSRC here.
ssrc_collision: AtomicU64,
/// If Some then there was an SSRC collision and we should switch to the
/// provided SSRC here.
ssrc_collision: Mutex<Option<u32>>,
/// Currently configured header extensions
extensions: Mutex<BTreeMap<u8, gst_rtp::RTPHeaderExtension>>,
}
@ -841,6 +837,13 @@ impl RtpBasePay2 {
pub(super) fn src_pad(&self) -> &gst::Pad {
&self.src_pad
}
/// Helper so we don't manually have to set ssrc_collision to None if there
/// is Some collision to handle.
fn take_ssrc_collision(&self) -> Option<u32> {
let mut ssrc_collision = self.ssrc_collision.lock().unwrap();
ssrc_collision.take()
}
}
/// Default virtual method implementations.
@ -1196,8 +1199,10 @@ impl RtpBasePay2 {
}
};
self.ssrc_collision
.store(new_ssrc as u64, atomic::Ordering::SeqCst);
{
let mut ssrc_collision = self.ssrc_collision.lock().unwrap();
*ssrc_collision = Some(new_ssrc);
}
}
fn src_event_default(&self, event: gst::Event) -> Result<gst::FlowSuccess, gst::FlowError> {
@ -1450,9 +1455,8 @@ impl RtpBasePay2 {
}
}
let ssrc_collision = self.ssrc_collision.load(atomic::Ordering::SeqCst);
if ssrc_collision != u64::MAX {
let new_ssrc = ssrc_collision as u32;
if let Some(ssrc_collision) = self.take_ssrc_collision() {
let new_ssrc = ssrc_collision;
let stream = state.stream.as_mut().unwrap();
gst::debug!(
CAT,
@ -1462,8 +1466,6 @@ impl RtpBasePay2 {
new_ssrc,
);
stream.ssrc = new_ssrc;
self.ssrc_collision
.store(u64::MAX, atomic::Ordering::SeqCst);
if let Some(ref src_caps) = state.negotiated_src_caps {
let mut src_caps = src_caps.copy();
@ -1733,7 +1735,7 @@ impl ObjectSubclass for RtpBasePay2 {
state: AtomicRefCell::default(),
settings: Mutex::default(),
stats: Mutex::default(),
ssrc_collision: AtomicU64::new(u64::MAX),
ssrc_collision: Mutex::new(None),
extensions: Mutex::default(),
}
}