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[Unwrap] Migrate TimestampExtrapolator to use RtpTimestampUnwrapper

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Bug: webrtc:13982
Change-Id: I570f2b053e7c77295e9d6a60f005e51022c3759f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/288942
Auto-Submit: Evan Shrubsole <eshr@webrtc.org>
Commit-Queue: Evan Shrubsole <eshr@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39042}
This commit is contained in:
Evan Shrubsole 2023-01-09 14:47:17 +00:00 committed by WebRTC LUCI CQ
parent 372cf8b824
commit 11dfb42fe9
4 changed files with 19 additions and 5 deletions
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1
modules/video_coding/timing/BUILD.gn
View file

@ -94,6 +94,7 @@ rtc_library("timestamp_extrapolator") {
deps = [
"../../../api/units:timestamp",
"../../../modules:module_api_public",
"../../../rtc_base:rtc_numerics",
]
absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
}

6
modules/video_coding/timing/timestamp_extrapolator.cc
View file

@ -13,7 +13,7 @@
#include <algorithm>
#include "absl/types/optional.h"
#include "modules/include/module_common_types_public.h"
#include "rtc_base/numerics/sequence_number_unwrapper.h"
namespace webrtc {
@ -47,7 +47,7 @@ void TimestampExtrapolator::Reset(Timestamp start) {
p_[0][0] = 1;
p_[1][1] = kP11;
p_[0][1] = p_[1][0] = 0;
unwrapper_ = TimestampUnwrapper();
unwrapper_ = RtpTimestampUnwrapper();
packet_count_ = 0;
detector_accumulator_pos_ = 0;
detector_accumulator_neg_ = 0;
@ -124,7 +124,7 @@ void TimestampExtrapolator::Update(Timestamp now, uint32_t ts90khz) {
absl::optional<Timestamp> TimestampExtrapolator::ExtrapolateLocalTime(
uint32_t timestamp90khz) const {
int64_t unwrapped_ts90khz = unwrapper_.UnwrapWithoutUpdate(timestamp90khz);
int64_t unwrapped_ts90khz = unwrapper_.PeekUnwrap(timestamp90khz);
if (!first_unwrapped_timestamp_) {
return absl::nullopt;

4
modules/video_coding/timing/timestamp_extrapolator.h
View file

@ -15,7 +15,7 @@
#include "absl/types/optional.h"
#include "api/units/timestamp.h"
#include "modules/include/module_common_types_public.h"
#include "rtc_base/numerics/sequence_number_unwrapper.h"
namespace webrtc {
@ -36,7 +36,7 @@ class TimestampExtrapolator {
Timestamp start_;
Timestamp prev_;
absl::optional<int64_t> first_unwrapped_timestamp_;
TimestampUnwrapper unwrapper_;
RtpTimestampUnwrapper unwrapper_;
absl::optional<int64_t> prev_unwrapped_timestamp_;
uint32_t packet_count_;
double detector_accumulator_pos_;

13
modules/video_coding/timing/timestamp_extrapolator_unittest.cc
View file

@ -120,6 +120,19 @@ TEST(TimestampExtrapolatorTest, TimestampExtrapolatesMultipleRtpWrapArounds) {
}
}
TEST(TimestampExtrapolatorTest, NegativeRtpTimestampWrapAround) {
SimulatedClock clock(Timestamp::Millis(1337));
TimestampExtrapolator ts_extrapolator(clock.CurrentTime());
uint32_t rtp = 0;
ts_extrapolator.Update(clock.CurrentTime(), rtp);
EXPECT_THAT(ts_extrapolator.ExtrapolateLocalTime(rtp),
Optional(clock.CurrentTime()));
// Go backwards!
rtp -= kRtpHz.hertz();
EXPECT_THAT(ts_extrapolator.ExtrapolateLocalTime(rtp),
Optional(clock.CurrentTime() - TimeDelta::Seconds(1)));
}
TEST(TimestampExtrapolatorTest, Slow90KHzClock) {
// This simulates a slow camera, which produces frames at 24Hz instead of
// 25Hz. The extrapolator should be able to resolve this with enough data.