1 // Copyright (c) 2017 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "third_party/blink/renderer/platform/peerconnection/rtc_rtp_source.h" 6 7 #include <cmath> 8 9 #include "base/notreached.h" 10 #include "base/time/time.h" 11 #include "third_party/webrtc/api/scoped_refptr.h" 12 #include "third_party/webrtc/system_wrappers/include/ntp_time.h" 13 14 namespace blink { 15 RTCRtpSource(const webrtc::RtpSource & source)16RTCRtpSource::RTCRtpSource(const webrtc::RtpSource& source) : source_(source) {} 17 ~RTCRtpSource()18RTCRtpSource::~RTCRtpSource() {} 19 SourceType() const20RTCRtpSource::Type RTCRtpSource::SourceType() const { 21 switch (source_.source_type()) { 22 case webrtc::RtpSourceType::SSRC: 23 return RTCRtpSource::Type::kSSRC; 24 case webrtc::RtpSourceType::CSRC: 25 return RTCRtpSource::Type::kCSRC; 26 default: 27 NOTREACHED(); 28 return RTCRtpSource::Type::kSSRC; 29 } 30 } 31 Timestamp() const32base::TimeTicks RTCRtpSource::Timestamp() const { 33 return base::TimeTicks() + 34 base::TimeDelta::FromMilliseconds(source_.timestamp_ms()); 35 } 36 Source() const37uint32_t RTCRtpSource::Source() const { 38 return source_.source_id(); 39 } 40 AudioLevel() const41base::Optional<double> RTCRtpSource::AudioLevel() const { 42 if (!source_.audio_level()) 43 return base::nullopt; 44 // Converted according to equation defined here: 45 // https://w3c.github.io/webrtc-pc/#dom-rtcrtpcontributingsource-audiolevel 46 uint8_t rfc_level = *source_.audio_level(); 47 if (rfc_level > 127u) 48 rfc_level = 127u; 49 if (rfc_level == 127u) 50 return 0.0; 51 return std::pow(10.0, -(double)rfc_level / 20.0); 52 } 53 RtpTimestamp() const54uint32_t RTCRtpSource::RtpTimestamp() const { 55 return source_.rtp_timestamp(); 56 } 57 CaptureTimestamp() const58base::Optional<int64_t> RTCRtpSource::CaptureTimestamp() const { 59 if (!source_.absolute_capture_time()) 60 return base::nullopt; 61 return webrtc::UQ32x32ToInt64Ms( 62 source_.absolute_capture_time()->absolute_capture_timestamp); 63 } 64 65 } // namespace blink 66