Ruslan Burakov | 428dcb2 | 2019-04-18 17:49:49 +0200 | [diff] [blame] | 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 | |
| 28 | JitterBufferDelay::JitterBufferDelay(rtc::Thread* worker_thread) |
| 29 | : signaling_thread_(rtc::Thread::Current()), worker_thread_(worker_thread) { |
| 30 | RTC_DCHECK(worker_thread_); |
| 31 | } |
| 32 | |
| 33 | void 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 | |
| 46 | void 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 | |
| 53 | void 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 |