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553fd3220b
The RtpDemuxer uses a number of maps, all of which can be made unordered as they map SSRCs/MIDs/payload types/RSIDs etc - all of which have no inherent ordering. In busy media servers, the std::map operations can use ~0.5% CPU. After this commit has landed, it will be evaluated and if it doesn't live up to expected savings, it will be reverted. Bug: webrtc:12689 Change-Id: I99e21c6b1ddb21dd9d47b0f9a891df5a2c3df59a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/216243 Reviewed-by: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Victor Boivie <boivie@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33846}
32 lines
997 B
C++
32 lines
997 B
C++
/*
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* Copyright (c) 2021 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 RTC_BASE_HASH_H_
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#define RTC_BASE_HASH_H_
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#include <stddef.h>
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#include <functional>
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#include <utility>
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namespace webrtc {
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// A custom hash function for std::pair, to be able to be used as key in a
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// std::unordered_map. If absl::flat_hash_map would ever be used, this is
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// unnecessary as it already has a hash function for std::pair.
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struct PairHash {
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template <class T1, class T2>
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size_t operator()(const std::pair<T1, T2>& p) const {
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return (3 * std::hash<T1>{}(p.first)) ^ std::hash<T2>{}(p.second);
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}
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};
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} // namespace webrtc
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#endif // RTC_BASE_HASH_H_
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