| /* |
| * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include <algorithm> |
| |
| #include "modules/rtp_rtcp/source/playout_delay_oracle.h" |
| |
| #include "modules/rtp_rtcp/source/rtp_header_extensions.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/logging.h" |
| |
| namespace webrtc { |
| |
| PlayoutDelayOracle::PlayoutDelayOracle() = default; |
| |
| PlayoutDelayOracle::~PlayoutDelayOracle() = default; |
| |
| absl::optional<PlayoutDelay> PlayoutDelayOracle::PlayoutDelayToSend( |
| PlayoutDelay requested_delay) const { |
| rtc::CritScope lock(&crit_sect_); |
| if (requested_delay.min_ms > PlayoutDelayLimits::kMaxMs || |
| requested_delay.max_ms > PlayoutDelayLimits::kMaxMs) { |
| RTC_DLOG(LS_ERROR) |
| << "Requested playout delay values out of range, ignored"; |
| return absl::nullopt; |
| } |
| if (requested_delay.max_ms != -1 && |
| requested_delay.min_ms > requested_delay.max_ms) { |
| RTC_DLOG(LS_ERROR) << "Requested playout delay values out of order"; |
| return absl::nullopt; |
| } |
| if ((requested_delay.min_ms == -1 || |
| requested_delay.min_ms == latest_delay_.min_ms) && |
| (requested_delay.max_ms == -1 || |
| requested_delay.max_ms == latest_delay_.max_ms)) { |
| // Unchanged. |
| return unacked_sequence_number_ ? absl::make_optional(latest_delay_) |
| : absl::nullopt; |
| } |
| if (requested_delay.min_ms == -1) { |
| RTC_DCHECK_GE(requested_delay.max_ms, 0); |
| requested_delay.min_ms = |
| std::min(latest_delay_.min_ms, requested_delay.max_ms); |
| } |
| if (requested_delay.max_ms == -1) { |
| requested_delay.max_ms = |
| std::max(latest_delay_.max_ms, requested_delay.min_ms); |
| } |
| return requested_delay; |
| } |
| |
| void PlayoutDelayOracle::OnSentPacket(uint16_t sequence_number, |
| absl::optional<PlayoutDelay> delay) { |
| rtc::CritScope lock(&crit_sect_); |
| int64_t unwrapped_sequence_number = unwrapper_.Unwrap(sequence_number); |
| |
| if (!delay) { |
| return; |
| } |
| |
| RTC_DCHECK_LE(0, delay->min_ms); |
| RTC_DCHECK_LE(delay->max_ms, PlayoutDelayLimits::kMaxMs); |
| RTC_DCHECK_LE(delay->min_ms, delay->max_ms); |
| |
| if (delay->min_ms != latest_delay_.min_ms || |
| delay->max_ms != latest_delay_.max_ms) { |
| latest_delay_ = *delay; |
| unacked_sequence_number_ = unwrapped_sequence_number; |
| } |
| } |
| |
| // If an ACK is received on the packet containing the playout delay extension, |
| // we stop sending the extension on future packets. |
| void PlayoutDelayOracle::OnReceivedAck( |
| int64_t extended_highest_sequence_number) { |
| rtc::CritScope lock(&crit_sect_); |
| if (unacked_sequence_number_ && |
| extended_highest_sequence_number > *unacked_sequence_number_) { |
| unacked_sequence_number_ = absl::nullopt; |
| } |
| } |
| |
| } // namespace webrtc |