5ab7616983
R=stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/12959004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6752 4adac7df-926f-26a2-2b94-8c16560cd09d
120 lines
2.4 KiB
C++
120 lines
2.4 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 <assert.h>
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#include <stdlib.h>
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#include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
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#ifdef _WIN32
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#include <windows.h>
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#include <MMSystem.h> //timeGetTime
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// TODO(hellner): investigate if it is necessary to disable these warnings.
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#pragma warning(disable:4311)
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#pragma warning(disable:4312)
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#else
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <sys/time.h>
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#endif
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namespace webrtc {
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SSRCDatabase*
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SSRCDatabase::StaticInstance(CountOperation count_operation)
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{
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SSRCDatabase* impl =
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GetStaticInstance<SSRCDatabase>(count_operation);
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return impl;
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}
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SSRCDatabase*
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SSRCDatabase::GetSSRCDatabase()
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{
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return StaticInstance(kAddRef);
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}
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void
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SSRCDatabase::ReturnSSRCDatabase()
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{
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StaticInstance(kRelease);
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}
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uint32_t
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SSRCDatabase::CreateSSRC()
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{
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CriticalSectionScoped lock(_critSect);
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uint32_t ssrc = GenerateRandom();
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while(_ssrcMap.find(ssrc) != _ssrcMap.end())
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{
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ssrc = GenerateRandom();
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}
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_ssrcMap[ssrc] = 0;
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return ssrc;
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}
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int32_t
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SSRCDatabase::RegisterSSRC(const uint32_t ssrc)
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{
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CriticalSectionScoped lock(_critSect);
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_ssrcMap[ssrc] = 0;
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return 0;
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}
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int32_t
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SSRCDatabase::ReturnSSRC(const uint32_t ssrc)
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{
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CriticalSectionScoped lock(_critSect);
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_ssrcMap.erase(ssrc);
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return 0;
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}
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SSRCDatabase::SSRCDatabase()
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{
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// we need to seed the random generator, otherwise we get 26500 each time, hardly a random value :)
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#ifdef _WIN32
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srand(timeGetTime());
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#else
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struct timeval tv;
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struct timezone tz;
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gettimeofday(&tv, &tz);
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srand(tv.tv_usec);
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#endif
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_critSect = CriticalSectionWrapper::CreateCriticalSection();
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}
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SSRCDatabase::~SSRCDatabase()
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{
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_ssrcMap.clear();
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delete _critSect;
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}
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uint32_t SSRCDatabase::GenerateRandom()
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{
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uint32_t ssrc = 0;
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do
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{
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ssrc = rand();
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ssrc = ssrc <<16;
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ssrc += rand();
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} while (ssrc == 0 || ssrc == 0xffffffff);
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return ssrc;
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}
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} // namespace webrtc
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