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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/modules/rtp_rtcp/source/ssrc_database.h"
#include "webrtc/base/checks.h"
#include "webrtc/system_wrappers/include/clock.h"
#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
namespace webrtc {
namespace {
uint64_t Seed() {
return Clock::GetRealTimeClock()->TimeInMicroseconds();
}
} // namespace
SSRCDatabase* SSRCDatabase::GetSSRCDatabase() {
return GetStaticInstance<SSRCDatabase>(kAddRef);
}
void SSRCDatabase::ReturnSSRCDatabase() {
GetStaticInstance<SSRCDatabase>(kRelease);
}
uint32_t SSRCDatabase::CreateSSRC() {
CriticalSectionScoped lock(crit_.get());
while (true) { // Try until get a new ssrc.
// 0 and 0xffffffff are invalid values for SSRC.
uint32_t ssrc = random_.Rand(1u, 0xfffffffe);
if (ssrcs_.insert(ssrc).second) {
return ssrc;
}
}
}
void SSRCDatabase::RegisterSSRC(uint32_t ssrc) {
CriticalSectionScoped lock(crit_.get());
ssrcs_.insert(ssrc);
}
void SSRCDatabase::ReturnSSRC(uint32_t ssrc) {
CriticalSectionScoped lock(crit_.get());
ssrcs_.erase(ssrc);
}
SSRCDatabase::SSRCDatabase()
: crit_(CriticalSectionWrapper::CreateCriticalSection()), random_(Seed()) {}
SSRCDatabase::~SSRCDatabase() {
}
} // namespace webrtc
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