1 files changed, 111 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/rtp_rtcp/source/rtcp_packet/tmmbr.cc b/third_party/libwebrtc/modules/rtp_rtcp/source/rtcp_packet/tmmbr.cc
new file mode 100644
index 0000000000..9dc745e509
--- /dev/null
+++ b/third_party/libwebrtc/modules/rtp_rtcp/source/rtcp_packet/tmmbr.cc
@@ -0,0 +1,111 @@
+/*
+ *  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 "modules/rtp_rtcp/source/rtcp_packet/tmmbr.h"
+
+#include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+namespace rtcp {
+constexpr uint8_t Tmmbr::kFeedbackMessageType;
+// RFC 4585: Feedback format.
+// Common packet format:
+//
+//   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|   FMT   |       PT      |          length               |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |                  SSRC of packet sender                        |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |             SSRC of media source (unused) = 0                 |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  :            Feedback Control Information (FCI)                 :
+//  :                                                               :
+// Temporary Maximum Media Stream Bit Rate Request (TMMBR) (RFC 5104).
+// The Feedback Control Information (FCI) for the TMMBR
+// consists of one or more FCI entries.
+// FCI:
+//   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
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |                              SSRC                             |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  | MxTBR Exp |  MxTBR Mantissa                 |Measured Overhead|
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+Tmmbr::Tmmbr() = default;
+
+Tmmbr::~Tmmbr() = default;
+
+bool Tmmbr::Parse(const CommonHeader& packet) {
+  RTC_DCHECK_EQ(packet.type(), kPacketType);
+  RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType);
+
+  if (packet.payload_size_bytes() < kCommonFeedbackLength + TmmbItem::kLength) {
+    RTC_LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes()
+                        << " is too small for a TMMBR.";
+    return false;
+  }
+  size_t items_size_bytes = packet.payload_size_bytes() - kCommonFeedbackLength;
+  if (items_size_bytes % TmmbItem::kLength != 0) {
+    RTC_LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes()
+                        << " is not valid for a TMMBR.";
+    return false;
+  }
+  ParseCommonFeedback(packet.payload());
+
+  const uint8_t* next_item = packet.payload() + kCommonFeedbackLength;
+  size_t number_of_items = items_size_bytes / TmmbItem::kLength;
+  items_.resize(number_of_items);
+  for (TmmbItem& item : items_) {
+    if (!item.Parse(next_item))
+      return false;
+    next_item += TmmbItem::kLength;
+  }
+  return true;
+}
+
+void Tmmbr::AddTmmbr(const TmmbItem& item) {
+  items_.push_back(item);
+}
+
+size_t Tmmbr::BlockLength() const {
+  return kHeaderLength + kCommonFeedbackLength +
+         TmmbItem::kLength * items_.size();
+}
+
+bool Tmmbr::Create(uint8_t* packet,
+                   size_t* index,
+                   size_t max_length,
+                   PacketReadyCallback callback) const {
+  RTC_DCHECK(!items_.empty());
+  while (*index + BlockLength() > max_length) {
+    if (!OnBufferFull(packet, index, callback))
+      return false;
+  }
+  const size_t index_end = *index + BlockLength();
+
+  CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet,
+               index);
+  RTC_DCHECK_EQ(0, Rtpfb::media_ssrc());
+  CreateCommonFeedback(packet + *index);
+  *index += kCommonFeedbackLength;
+  for (const TmmbItem& item : items_) {
+    item.Create(packet + *index);
+    *index += TmmbItem::kLength;
+  }
+  RTC_CHECK_EQ(index_end, *index);
+  return true;
+}
+}  // namespace rtcp
+}  // namespace webrtc