| OLD | NEW |
|---|
| (Empty) |
| 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 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/sli.h" | |
| 12 | |
| 13 #include "webrtc/base/checks.h" | |
| 14 #include "webrtc/base/logging.h" | |
| 15 #include "webrtc/modules/rtp_rtcp/source/byte_io.h" | |
| 16 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h" | |
| 17 | |
| 18 namespace webrtc { | |
| 19 namespace rtcp { | |
| 20 constexpr uint8_t Sli::kFeedbackMessageType; | |
| 21 // RFC 4585: Feedback format. | |
| 22 // | |
| 23 // Common packet format: | |
| 24 // | |
| 25 // 0 1 2 3 | |
| 26 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
| 27 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 28 // |V=2|P| FMT | PT | length | | |
| 29 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 30 // | SSRC of packet sender | | |
| 31 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 32 // | SSRC of media source | | |
| 33 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 34 // : Feedback Control Information (FCI) : | |
| 35 // : : | |
| 36 // | |
| 37 // Slice loss indication (SLI) (RFC 4585). | |
| 38 // FCI: | |
| 39 // 0 1 2 3 | |
| 40 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
| 41 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 42 // | First | Number | PictureID | | |
| 43 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| 44 Sli::Macroblocks::Macroblocks(uint8_t picture_id, | |
| 45 uint16_t first, | |
| 46 uint16_t number) { | |
| 47 RTC_DCHECK_LE(first, 0x1fff); | |
| 48 RTC_DCHECK_LE(number, 0x1fff); | |
| 49 RTC_DCHECK_LE(picture_id, 0x3f); | |
| 50 item_ = (first << 19) | (number << 6) | picture_id; | |
| 51 } | |
| 52 | |
| 53 void Sli::Macroblocks::Parse(const uint8_t* buffer) { | |
| 54 item_ = ByteReader<uint32_t>::ReadBigEndian(buffer); | |
| 55 } | |
| 56 | |
| 57 void Sli::Macroblocks::Create(uint8_t* buffer) const { | |
| 58 ByteWriter<uint32_t>::WriteBigEndian(buffer, item_); | |
| 59 } | |
| 60 | |
| 61 bool Sli::Parse(const CommonHeader& packet) { | |
| 62 RTC_DCHECK_EQ(packet.type(), kPacketType); | |
| 63 RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType); | |
| 64 | |
| 65 if (packet.payload_size_bytes() < | |
| 66 kCommonFeedbackLength + Macroblocks::kLength) { | |
| 67 LOG(LS_WARNING) << "Packet is too small to be a valid SLI packet"; | |
| 68 return false; | |
| 69 } | |
| 70 | |
| 71 size_t number_of_items = | |
| 72 (packet.payload_size_bytes() - kCommonFeedbackLength) / | |
| 73 Macroblocks::kLength; | |
| 74 | |
| 75 ParseCommonFeedback(packet.payload()); | |
| 76 items_.resize(number_of_items); | |
| 77 | |
| 78 const uint8_t* next_item = packet.payload() + kCommonFeedbackLength; | |
| 79 for (Macroblocks& item : items_) { | |
| 80 item.Parse(next_item); | |
| 81 next_item += Macroblocks::kLength; | |
| 82 } | |
| 83 | |
| 84 return true; | |
| 85 } | |
| 86 | |
| 87 bool Sli::Create(uint8_t* packet, | |
| 88 size_t* index, | |
| 89 size_t max_length, | |
| 90 RtcpPacket::PacketReadyCallback* callback) const { | |
| 91 RTC_DCHECK(!items_.empty()); | |
| 92 while (*index + BlockLength() > max_length) { | |
| 93 if (!OnBufferFull(packet, index, callback)) | |
| 94 return false; | |
| 95 } | |
| 96 CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet, | |
| 97 index); | |
| 98 CreateCommonFeedback(packet + *index); | |
| 99 *index += kCommonFeedbackLength; | |
| 100 for (const Macroblocks& item : items_) { | |
| 101 item.Create(packet + *index); | |
| 102 *index += Macroblocks::kLength; | |
| 103 } | |
| 104 return true; | |
| 105 } | |
| 106 | |
| 107 } // namespace rtcp | |
| 108 } // namespace webrtc | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2742383004:
Delete support for receiving RTCP RPSI and SLI messages. (Closed)
