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1 /* | |
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license | |
5 * that can be found in the LICENSE file in the root of the source | |
6 * tree. An additional intellectual property rights grant can be found | |
7 * in the file PATENTS. All contributing project authors may | |
8 * be found in the AUTHORS file in the root of the source tree. | |
9 */ | |
10 | |
11 #include "webrtc/modules/rtp_rtcp/source/ssrc_database.h" | |
12 #include "webrtc/base/timeutils.h" | |
13 #include "webrtc/base/checks.h" | |
14 | |
15 namespace webrtc { | |
16 | |
17 SSRCDatabase* SSRCDatabase::GetSSRCDatabase() { | |
18 return GetStaticInstance<SSRCDatabase>(kAddRef); | |
19 } | |
20 | |
21 void SSRCDatabase::ReturnSSRCDatabase() { | |
22 GetStaticInstance<SSRCDatabase>(kRelease); | |
23 } | |
24 | |
25 uint32_t SSRCDatabase::CreateSSRC() { | |
26 rtc::CritScope lock(&crit_); | |
27 | |
28 while (true) { // Try until get a new ssrc. | |
29 // 0 and 0xffffffff are invalid values for SSRC. | |
30 uint32_t ssrc = random_.Rand(1u, 0xfffffffe); | |
31 if (ssrcs_.insert(ssrc).second) { | |
32 return ssrc; | |
33 } | |
34 } | |
35 } | |
36 | |
37 void SSRCDatabase::RegisterSSRC(uint32_t ssrc) { | |
38 rtc::CritScope lock(&crit_); | |
39 ssrcs_.insert(ssrc); | |
40 } | |
41 | |
42 void SSRCDatabase::ReturnSSRC(uint32_t ssrc) { | |
43 rtc::CritScope lock(&crit_); | |
44 ssrcs_.erase(ssrc); | |
45 } | |
46 | |
47 SSRCDatabase::SSRCDatabase() : random_(rtc::TimeMicros()) {} | |
48 | |
49 SSRCDatabase::~SSRCDatabase() {} | |
50 | |
51 } // namespace webrtc | |
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