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Prevent missing corruption header because of floating point errors.

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Sometimes the blurred value gets to be a little above 255 because of
floating point errors. This prevents the header from being sent, losing
1 second of information. This can easily be prevented with the changes
in this CL.

Bug: webrtc:358039777
Change-Id: Ibad1c8f41272260e28fe58557c623e52a6af8294
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/376740
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Emil Vardar (xWF) <vardar@google.com>
Cr-Commit-Position: refs/heads/main@{#43906}
This commit is contained in:
Emil Vardar 2025-02-14 09:59:26 +00:00 committed by WebRTC LUCI CQ
parent 5f90dc8afb
commit ba0d9713ba
3 changed files with 17 additions and 1 deletions
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1
video/corruption_detection/BUILD.gn
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@ -103,6 +103,7 @@ rtc_library("halton_frame_sampler") {
"../../api/video:video_frame",
"../../rtc_base:checks",
"../../rtc_base:logging",
"../../rtc_base:safe_minmax",
]
}

5
video/corruption_detection/halton_frame_sampler.cc
View File

@ -20,6 +20,7 @@
#include "api/video/video_frame_buffer.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_minmax.h"
#include "video/corruption_detection/halton_sequence.h"
namespace webrtc {
@ -134,7 +135,9 @@ double GetFilteredElement(int width,
total_weight += weight;
}
}
return element_sum / total_weight;
// Take the rounding errors into consideration.
return rtc::SafeClamp(element_sum / total_weight, 0.0, 255.0);
}
std::vector<FilteredSample> GetSampleValuesForFrame(

12
video/corruption_detection/halton_frame_sampler_unittest.cc
View File

@ -145,6 +145,18 @@ TEST(GaussianFilteringTest, ShouldCrashWhenStdDevIsNegative) {
_);
}
TEST(GaussianFilteringTest, RoundingErrorsShouldNotHappen) {
// These values should force a rounding error.
constexpr int kWidth = 128;
constexpr int kHeight = 128;
constexpr double kStdDev = 40;
const std::vector<uint8_t> data(kWidth * kHeight, 255);
EXPECT_THAT(GetFilteredElement(kWidth, kHeight, kHeight, data.data(),
kWidth / 2, kHeight / 2, kStdDev),
255);
}
TEST(HaltonFrameSamplerTest, FrameIsNotSampledWhenTimestampsAreEqual) {
HaltonFrameSampler halton_frame_sampler;