Delete support for receiving RTCP RPSI and SLI messages.

webrtc/modules/rtp_rtcp/source/rtcp_packet/rpsi.cc

-/*
- *  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 "webrtc/modules/rtp_rtcp/source/rtcp_packet/rpsi.h"
-
-#include "webrtc/base/checks.h"
-#include "webrtc/base/logging.h"
-#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
-#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h"
-#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
-
-using webrtc::RtpUtility::Word32Align;
-
-namespace webrtc {
-namespace rtcp {
-constexpr uint8_t Rpsi::kFeedbackMessageType;
-// RFC 4585: Feedback format.
-// Reference picture selection indication (RPSI) (RFC 4585).
-//
-//     0                   1                   2                   3
-//     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
-//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//    |V=2|P| RPSI=3  |  PT=PSFB=206  |          length               |
-//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//  0 |                  SSRC of packet sender                        |
-//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//  4 |                  SSRC of media source                         |
-//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//  8 | Padding Bits  |
-//  9                 |0| Payload Type|
-// 10                                 |  Native RPSI bit string       :
-//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-//    :   defined per codec          ...                | Padding (0) |
-//    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-namespace {
-constexpr size_t kPaddingSizeOffset = 8;
-constexpr size_t kPayloadTypeOffset = 9;
-constexpr size_t kBitStringOffset = 10;
-
-constexpr size_t kPidBits = 7;
-// Calculates number of bytes required to store given picture id.
-uint8_t RequiredBytes(uint64_t picture_id) {
-  uint8_t required_bytes = 0;
-  uint64_t shifted_pid = picture_id;
-  do {
-    ++required_bytes;
-    shifted_pid >>= kPidBits;
-  } while (shifted_pid > 0);
-
-  return required_bytes;
-}
-}  // namespace
-
-Rpsi::Rpsi()
-    : payload_type_(0),
-      picture_id_(0),
-      block_length_(CalculateBlockLength(1)) {}
-
-bool Rpsi::Parse(const CommonHeader& packet) {
-  RTC_DCHECK_EQ(packet.type(), kPacketType);
-  RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType);
-
-  if (packet.payload_size_bytes() < kCommonFeedbackLength + 4) {
-    LOG(LS_WARNING) << "Packet is too small to be a valid RPSI packet.";
-    return false;
-  }
-
-  ParseCommonFeedback(packet.payload());
-
-  uint8_t padding_bits = packet.payload()[kPaddingSizeOffset];
-  if (padding_bits % 8 != 0) {
-    LOG(LS_WARNING) << "Unknown rpsi packet with fractional number of bytes.";
-    return false;
-  }
-  size_t padding_bytes = padding_bits / 8;
-  if (padding_bytes + kBitStringOffset >= packet.payload_size_bytes()) {
-    LOG(LS_WARNING) << "Too many padding bytes in a RPSI packet.";
-    return false;
-  }
-  size_t padding_offset = packet.payload_size_bytes() - padding_bytes;
-  payload_type_ = packet.payload()[kPayloadTypeOffset] & 0x7f;
-  picture_id_ = 0;
-  for (size_t pos = kBitStringOffset; pos < padding_offset; ++pos) {
-    picture_id_ <<= kPidBits;
-    picture_id_ |= (packet.payload()[pos] & 0x7f);
-  }
-  // Required bytes might become less than came in the packet.
-  block_length_ = CalculateBlockLength(RequiredBytes(picture_id_));
-  return true;
-}
-
-bool Rpsi::Create(uint8_t* packet,
-                  size_t* index,
-                  size_t max_length,
-                  RtcpPacket::PacketReadyCallback* callback) const {
-  while (*index + BlockLength() > max_length) {
-    if (!OnBufferFull(packet, index, callback))
-      return false;
-  }
-  size_t index_end = *index + BlockLength();
-
-  CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet,
-               index);
-  CreateCommonFeedback(packet + *index);
-  *index += kCommonFeedbackLength;
-
-  size_t bitstring_size_bytes = RequiredBytes(picture_id_);
-  size_t padding_bytes =
-      Word32Align(2 + bitstring_size_bytes) - (2 + bitstring_size_bytes);
-  packet[(*index)++] = padding_bytes * 8;
-  packet[(*index)++] = payload_type_;
-
-  // Convert picture id to native bit string (defined by the video codec).
-  for (size_t i = bitstring_size_bytes - 1; i > 0; --i) {
-    packet[(*index)++] =
-        0x80 | static_cast<uint8_t>(picture_id_ >> (i * kPidBits));
-  }
-  packet[(*index)++] = static_cast<uint8_t>(picture_id_ & 0x7f);
-  constexpr uint8_t kPadding = 0;
-  for (size_t i = 0; i < padding_bytes; ++i)
-    packet[(*index)++] = kPadding;
-  RTC_CHECK_EQ(*index, index_end);
-  return true;
-}
-
-void Rpsi::SetPayloadType(uint8_t payload) {
-  RTC_DCHECK_LE(payload, 0x7f);
-  payload_type_ = payload;
-}
-
-void Rpsi::SetPictureId(uint64_t picture_id) {
-  picture_id_ = picture_id;
-  block_length_ = CalculateBlockLength(RequiredBytes(picture_id_));
-}
-
-size_t Rpsi::CalculateBlockLength(uint8_t bitstring_size_bytes) {
-  return RtcpPacket::kHeaderLength + Psfb::kCommonFeedbackLength +
-         Word32Align(2 + bitstring_size_bytes);
-}
-}  // namespace rtcp
-}  // namespace webrtc