e005cf2c93
BUG=webrtc:5277 R=mflodman Review URL: https://codereview.webrtc.org/1507313005 Cr-Commit-Position: refs/heads/master@{#11023}
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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* Copyright (c) 2011 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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#include "webrtc/modules/rtp_rtcp/source/ssrc_database.h"
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#include "webrtc/base/checks.h"
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#include "webrtc/system_wrappers/include/clock.h"
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#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
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namespace webrtc {
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namespace {
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uint64_t Seed() {
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return Clock::GetRealTimeClock()->TimeInMicroseconds();
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}
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} // namespace
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SSRCDatabase* SSRCDatabase::GetSSRCDatabase() {
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return GetStaticInstance<SSRCDatabase>(kAddRef);
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}
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void SSRCDatabase::ReturnSSRCDatabase() {
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GetStaticInstance<SSRCDatabase>(kRelease);
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}
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uint32_t SSRCDatabase::CreateSSRC() {
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CriticalSectionScoped lock(crit_.get());
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while (true) { // Try until get a new ssrc.
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// 0 and 0xffffffff are invalid values for SSRC.
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uint32_t ssrc = random_.Rand(1u, 0xfffffffe);
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if (ssrcs_.insert(ssrc).second) {
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return ssrc;
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}
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}
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}
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void SSRCDatabase::RegisterSSRC(uint32_t ssrc) {
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CriticalSectionScoped lock(crit_.get());
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ssrcs_.insert(ssrc);
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}
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void SSRCDatabase::ReturnSSRC(uint32_t ssrc) {
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CriticalSectionScoped lock(crit_.get());
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ssrcs_.erase(ssrc);
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}
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SSRCDatabase::SSRCDatabase()
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: crit_(CriticalSectionWrapper::CreateCriticalSection()), random_(Seed()) {}
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SSRCDatabase::~SSRCDatabase() {
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}
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} // namespace webrtc
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