| /* |
| * 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. |
| * |
| */ |
| #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_ |
| #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_ |
| |
| #include <vector> |
| |
| #include "webrtc/base/basictypes.h" |
| #include "webrtc/base/constructormagic.h" |
| #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h" |
| |
| namespace webrtc { |
| namespace rtcp { |
| class CommonHeader; |
| |
| // Slice loss indication (SLI) (RFC 4585). |
| class Sli : public Psfb { |
| public: |
| static constexpr uint8_t kFeedbackMessageType = 2; |
| class Macroblocks { |
| public: |
| static constexpr size_t kLength = 4; |
| Macroblocks() : item_(0) {} |
| Macroblocks(uint8_t picture_id, uint16_t first, uint16_t number); |
| ~Macroblocks() {} |
| |
| void Parse(const uint8_t* buffer); |
| void Create(uint8_t* buffer) const; |
| |
| uint16_t first() const { return item_ >> 19; } |
| uint16_t number() const { return (item_ >> 6) & 0x1fff; } |
| uint8_t picture_id() const { return (item_ & 0x3f); } |
| |
| private: |
| uint32_t item_; |
| }; |
| |
| Sli() {} |
| ~Sli() override {} |
| |
| // Parse assumes header is already parsed and validated. |
| bool Parse(const CommonHeader& packet); |
| |
| void AddPictureId(uint8_t picture_id) { |
| items_.emplace_back(picture_id, 0, 0x1fff); |
| } |
| void AddPictureId(uint8_t picture_id, |
| uint16_t first_macroblock, |
| uint16_t number_macroblocks) { |
| items_.emplace_back(picture_id, first_macroblock, number_macroblocks); |
| } |
| |
| const std::vector<Macroblocks>& macroblocks() const { return items_; } |
| |
| protected: |
| bool Create(uint8_t* packet, |
| size_t* index, |
| size_t max_length, |
| RtcpPacket::PacketReadyCallback* callback) const override; |
| |
| private: |
| size_t BlockLength() const override { |
| return RtcpPacket::kHeaderLength + Psfb::kCommonFeedbackLength + |
| items_.size() * Macroblocks::kLength; |
| } |
| |
| std::vector<Macroblocks> items_; |
| |
| RTC_DISALLOW_COPY_AND_ASSIGN(Sli); |
| }; |
| |
| } // namespace rtcp |
| } // namespace webrtc |
| #endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_ |