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Update notify_about_position logic

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It would be so much easier to use elapsed but elapsed could potentially panic is rare cases.

See: https://doc.rust-lang.org/std/time/struct.Instant.html#monotonicity

Otherwise this is pretty straight forward.
If anything fails getting expected_position_ms it will return 0 which will trigger a notify if either stream_position_ms or decoder_position_ms is > 1000.

If all goes well it's simply a matter of calculating the max delta of expected_position_ms and stream_position_ms and expected_position_ms and decoder_position_ms.
So if the decoder or the sample pipeline are off by more than 1 sec we notify.
This commit is contained in:
JasonLG1979 2023-06-22 14:29:04 -05:00
parent 09bd1bd324
commit 8d35b4b860
1 changed files with 38 additions and 48 deletions
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82
playback/src/player.rs
View file

@ -1150,68 +1150,58 @@ impl Future for PlayerInternal {
match decoder.next_packet() {
Ok(result) => {
if let Some((ref packet_position, ref packet)) = result {
let new_stream_position_ms = packet_position
.position_ms
.saturating_sub(sample_pipeline_latency_ms);
let decoder_position_ms = packet_position.position_ms;
let expected_position_ms = std::mem::replace(
&mut *stream_position_ms,
new_stream_position_ms,
);
*stream_position_ms =
decoder_position_ms.saturating_sub(sample_pipeline_latency_ms);
if !passthrough {
match packet.samples() {
Ok(_) => {
let new_stream_position = Duration::from_millis(
new_stream_position_ms as u64,
);
let now = Instant::now();
// Only notify if we're skipped some packets *or* we are behind.
// If we're ahead it's probably due to a buffer of the backend
// and we're actually in time.
let notify_about_position =
match *reported_nominal_start_time {
None => true,
Some(reported_nominal_start_time) => {
let mut notify = false;
if packet_position.skipped {
if let Some(ahead) = new_stream_position
.checked_sub(Duration::from_millis(
expected_position_ms as u64,
))
{
notify |=
ahead >= Duration::from_secs(1)
}
}
if let Some(lag) = now
let notify_about_position = {
// It would be so much easier to use elapsed but elapsed could
// potentially panic is rare cases.
// See:
// https://doc.rust-lang.org/std/time/struct.Instant.html#monotonicity
//
// Otherwise this is pretty straight forward. If anything fails getting
// expected_position_ms it will return 0 which will trigger a notify if
// either stream_position_ms or decoder_position_ms is > 1000. If all goes
// well it's simply a matter of calculating the max delta of expected_position_ms
// and stream_position_ms and expected_position_ms and decoder_position_ms.
// So if the decoder or the sample pipeline are off by more than 1 sec we notify.
let expected_position_ms = now
.checked_duration_since(
reported_nominal_start_time,
reported_nominal_start_time.unwrap_or(now),
)
{
if let Some(lag) =
lag.checked_sub(new_stream_position)
{
notify |=
lag >= Duration::from_secs(1)
}
}
.unwrap_or(Duration::ZERO)
.as_millis();
notify || sample_pipeline_latency_ms > 1000
}
let max_expected_position_delta_ms =
expected_position_ms
.abs_diff(*stream_position_ms as u128)
.max(
expected_position_ms.abs_diff(
decoder_position_ms as u128,
),
);
max_expected_position_delta_ms > 1000
};
if notify_about_position {
*reported_nominal_start_time =
now.checked_sub(new_stream_position);
let position_ms = *stream_position_ms;
*reported_nominal_start_time = now.checked_sub(
Duration::from_millis(position_ms as u64),
);
self.send_event(PlayerEvent::PositionCorrection {
play_request_id,
track_id,
position_ms: new_stream_position_ms,
position_ms,
});
}
}