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098da17f35
This is a reland of 8c2250eddc
Original change's description:
> Replace RTC_WARN_UNUSED_RESULT with ABSL_MUST_USE_RESULT in c++ code
>
> Bug: webrtc:12336
> Change-Id: If76f00d0883b5c8a90d3ef5554f5e22384b3fb58
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/197620
> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
> Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org>
> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#32978}
Bug: webrtc:12336
Change-Id: I1cd017d45c1578528dec4532345950e9823f4a63
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/201732
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33003}
82 lines
3.2 KiB
C++
82 lines
3.2 KiB
C++
/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_LOSS_NOTIFICATION_H_
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#define MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_LOSS_NOTIFICATION_H_
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#include "absl/base/attributes.h"
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#include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
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#include "modules/rtp_rtcp/source/rtcp_packet/psfb.h"
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namespace webrtc {
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namespace rtcp {
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class LossNotification : public Psfb {
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public:
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LossNotification();
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LossNotification(uint16_t last_decoded,
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uint16_t last_received,
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bool decodability_flag);
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LossNotification(const LossNotification& other);
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~LossNotification() override;
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size_t BlockLength() const override;
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ABSL_MUST_USE_RESULT
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bool Create(uint8_t* packet,
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size_t* index,
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size_t max_length,
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PacketReadyCallback callback) const override;
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// Parse assumes header is already parsed and validated.
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ABSL_MUST_USE_RESULT
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bool Parse(const CommonHeader& packet);
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// Set all of the values transmitted by the loss notification message.
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// If the values may not be represented by a loss notification message,
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// false is returned, and no change is made to the object; this happens
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// when |last_recieved| is ahead of |last_decoded| by more than 0x7fff.
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// This is because |last_recieved| is represented on the wire as a delta,
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// and only 15 bits are available for that delta.
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ABSL_MUST_USE_RESULT
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bool Set(uint16_t last_decoded,
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uint16_t last_received,
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bool decodability_flag);
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// RTP sequence number of the first packet belong to the last decoded
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// non-discardable frame.
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uint16_t last_decoded() const { return last_decoded_; }
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// RTP sequence number of the last received packet.
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uint16_t last_received() const { return last_received_; }
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// A decodability flag, whose specific meaning depends on the last-received
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// RTP sequence number. The decodability flag is true if and only if all of
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// the frame's dependencies are known to be decodable, and the frame itself
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// is not yet known to be unassemblable.
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// * Clarification #1: In a multi-packet frame, the first packet's
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// dependencies are known, but it is not yet known whether all parts
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// of the current frame will be received.
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// * Clarification #2: In a multi-packet frame, the dependencies would be
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// unknown if the first packet was not received. Then, the packet will
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// be known-unassemblable.
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bool decodability_flag() const { return decodability_flag_; }
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private:
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static constexpr uint32_t kUniqueIdentifier = 0x4C4E5446; // 'L' 'N' 'T' 'F'.
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static constexpr size_t kLossNotificationPayloadLength = 8;
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uint16_t last_decoded_;
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uint16_t last_received_;
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bool decodability_flag_;
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};
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} // namespace rtcp
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} // namespace webrtc
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#endif // MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_LOSS_NOTIFICATION_H_
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