1 /* 2 * Copyright (c) 2016 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 12 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_ 13 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_ 14 15 #include <vector> 16 17 #include "webrtc/base/basictypes.h" 18 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h" 19 #include "webrtc/modules/rtp_rtcp/source/rtcp_utility.h" 20 21 namespace webrtc { 22 namespace rtcp { 23 24 // Slice loss indication (SLI) (RFC 4585). 25 class Sli : public Psfb { 26 public: 27 static const uint8_t kFeedbackMessageType = 2; 28 class Macroblocks { 29 public: 30 static const size_t kLength = 4; Macroblocks()31 Macroblocks() : item_(0) {} 32 Macroblocks(uint8_t picture_id, uint16_t first, uint16_t number); ~Macroblocks()33 ~Macroblocks() {} 34 35 void Parse(const uint8_t* buffer); 36 void Create(uint8_t* buffer) const; 37 first()38 uint16_t first() const { return item_ >> 19; } number()39 uint16_t number() const { return (item_ >> 6) & 0x1fff; } picture_id()40 uint8_t picture_id() const { return (item_ & 0x3f); } 41 42 private: 43 uint32_t item_; 44 }; 45 Sli()46 Sli() {} ~Sli()47 virtual ~Sli() {} 48 49 // Parse assumes header is already parsed and validated. 50 bool Parse(const RTCPUtility::RtcpCommonHeader& header, 51 const uint8_t* payload); // Size of the payload is in the header. 52 53 void WithPictureId(uint8_t picture_id, 54 uint16_t first_macroblock = 0, 55 uint16_t number_macroblocks = 0x1fff) { 56 items_.push_back( 57 Macroblocks(picture_id, first_macroblock, number_macroblocks)); 58 } 59 macroblocks()60 const std::vector<Macroblocks>& macroblocks() const { return items_; } 61 62 protected: 63 bool Create(uint8_t* packet, 64 size_t* index, 65 size_t max_length, 66 RtcpPacket::PacketReadyCallback* callback) const override; 67 68 private: BlockLength()69 size_t BlockLength() const override { 70 return RtcpPacket::kHeaderLength + Psfb::kCommonFeedbackLength + 71 items_.size() * Macroblocks::kLength; 72 } 73 74 std::vector<Macroblocks> items_; 75 76 RTC_DISALLOW_COPY_AND_ASSIGN(Sli); 77 }; 78 79 } // namespace rtcp 80 } // namespace webrtc 81 #endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_SLI_H_ 82