f045dbd67c
For key frames: increase the sequence index until the last 7 bits are all zeroes. If this results in an overflow, wraparound to 0. Also: * Allow setting and getting the sequence index * Allow getting LayerId Bug: webrtc:358039777 Change-Id: Ibe16689a3d1eb5706d4fce5c9220770046f26896 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/362540 Reviewed-by: Erik Språng <sprang@webrtc.org> Auto-Submit: Fanny Linderborg <linderborg@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43042}
49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/*
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* Copyright 2024 The WebRTC project authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VIDEO_CORRUPTION_DETECTION_HALTON_SEQUENCE_H_
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#define VIDEO_CORRUPTION_DETECTION_HALTON_SEQUENCE_H_
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#include <vector>
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namespace webrtc {
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// Generates the Halton sequence: a low discrepancy sequence of doubles in the
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// half-open interval [0,1). See https://en.wikipedia.org/wiki/Halton_sequence
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// for information on how the sequence is constructed.
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class HaltonSequence {
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public:
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// Creates a sequence in `num_dimensions` number of dimensions. Possible
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// values are [1, 5].
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explicit HaltonSequence(int num_dimensions);
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// Creates a default sequence in a single dimension.
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HaltonSequence() = default;
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HaltonSequence(const HaltonSequence&) = default;
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HaltonSequence(HaltonSequence&&) = default;
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HaltonSequence& operator=(const HaltonSequence&) = default;
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HaltonSequence& operator=(HaltonSequence&&) = default;
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~HaltonSequence() = default;
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// Gets the next point in the sequence where each value is in the half-open
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// interval [0,1).
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std::vector<double> GetNext();
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int GetCurrentIndex() const { return current_idx_; }
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void SetCurrentIndex(int idx);
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void Reset();
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private:
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int num_dimensions_ = 1;
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int current_idx_ = 0;
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};
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} // namespace webrtc
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#endif // VIDEO_CORRUPTION_DETECTION_HALTON_SEQUENCE_H_
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