1 /* 2 * Copyright 2019 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 "pc/jitter_buffer_delay.h" 12 13 #include "rtc_base/checks.h" 14 #include "rtc_base/location.h" 15 #include "rtc_base/logging.h" 16 #include "rtc_base/numerics/safe_conversions.h" 17 #include "rtc_base/numerics/safe_minmax.h" 18 #include "rtc_base/thread.h" 19 #include "rtc_base/thread_checker.h" 20 21 namespace { 22 constexpr int kDefaultDelay = 0; 23 constexpr int kMaximumDelayMs = 10000; 24 } // namespace 25 26 namespace webrtc { 27 JitterBufferDelay(rtc::Thread * worker_thread)28JitterBufferDelay::JitterBufferDelay(rtc::Thread* worker_thread) 29 : signaling_thread_(rtc::Thread::Current()), worker_thread_(worker_thread) { 30 RTC_DCHECK(worker_thread_); 31 } 32 OnStart(cricket::Delayable * media_channel,uint32_t ssrc)33void JitterBufferDelay::OnStart(cricket::Delayable* media_channel, 34 uint32_t ssrc) { 35 RTC_DCHECK_RUN_ON(signaling_thread_); 36 37 media_channel_ = media_channel; 38 ssrc_ = ssrc; 39 40 // Trying to apply cached delay for the audio stream. 41 if (cached_delay_seconds_) { 42 Set(cached_delay_seconds_.value()); 43 } 44 } 45 OnStop()46void JitterBufferDelay::OnStop() { 47 RTC_DCHECK_RUN_ON(signaling_thread_); 48 // Assume that audio stream is no longer present. 49 media_channel_ = nullptr; 50 ssrc_ = absl::nullopt; 51 } 52 Set(absl::optional<double> delay_seconds)53void JitterBufferDelay::Set(absl::optional<double> delay_seconds) { 54 RTC_DCHECK_RUN_ON(worker_thread_); 55 56 // TODO(kuddai) propagate absl::optional deeper down as default preference. 57 int delay_ms = 58 rtc::saturated_cast<int>(delay_seconds.value_or(kDefaultDelay) * 1000); 59 delay_ms = rtc::SafeClamp(delay_ms, 0, kMaximumDelayMs); 60 61 cached_delay_seconds_ = delay_seconds; 62 if (media_channel_ && ssrc_) { 63 media_channel_->SetBaseMinimumPlayoutDelayMs(ssrc_.value(), delay_ms); 64 } 65 } 66 67 } // namespace webrtc 68