[rtp_rtcp] rtcp::Xr moved into own file and renamed to ExtendedReports on the way

webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.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/extended_reports.h"
+
+#include "webrtc/base/checks.h"
+#include "webrtc/base/logging.h"
+#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
+
+using webrtc::RTCPUtility::PT_XR;
+using webrtc::RTCPUtility::RTCPPacketXR;
+
+namespace webrtc {
+namespace rtcp {
+namespace {
+void AssignUWord32(uint8_t* buffer, size_t* offset, uint32_t value) {
+  ByteWriter<uint32_t>::WriteBigEndian(buffer + *offset, value);
+  *offset += 4;
+}
+// From RFC 3611: RTP Control Protocol Extended Reports (RTCP XR).
+//
+// Format for XR packets:
+//
+//   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|reserved |   PT=XR=207   |             length            |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  |                              SSRC                             |
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//  :                         report blocks                         :
+//  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+void CreateXrHeader(const RTCPPacketXR& header,
+                    uint8_t* buffer,
+                    size_t* pos) {
+  AssignUWord32(buffer, pos, header.OriginatorSSRC);
+}
+}  // namespace
+
+bool ExtendedReports::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;
+  }
+  CreateHeader(0U, PT_XR, HeaderLength(), packet, index);
+  CreateXrHeader(xr_header_, packet, index);
+  for (const Rrtr& block : rrtr_blocks_) {
+    block.Create(packet + *index);
+    *index += Rrtr::kLength;
+  }
+  for (const Dlrr& block : dlrr_blocks_) {
+    block.Create(packet + *index);
+    *index += block.BlockLength();
+  }
+  for (const VoipMetric& block : voip_metric_blocks_) {
+    block.Create(packet + *index);
+    *index += VoipMetric::kLength;
+  }
+  return true;
+}
+
+bool ExtendedReports::WithRrtr(Rrtr* rrtr) {
+  RTC_DCHECK(rrtr);
+  if (rrtr_blocks_.size() >= kMaxNumberOfRrtrBlocks) {
+    LOG(LS_WARNING) << "Max RRTR blocks reached.";
+    return false;
+  }
+  rrtr_blocks_.push_back(*rrtr);
+  return true;
+}
+
+bool ExtendedReports::WithDlrr(Dlrr* dlrr) {
+  RTC_DCHECK(dlrr);
+  if (dlrr_blocks_.size() >= kMaxNumberOfDlrrBlocks) {
+    LOG(LS_WARNING) << "Max DLRR blocks reached.";
+    return false;
+  }
+  dlrr_blocks_.push_back(*dlrr);
+  return true;
+}
+
+bool ExtendedReports::WithVoipMetric(VoipMetric* voip_metric) {
+  assert(voip_metric);
+  if (voip_metric_blocks_.size() >= kMaxNumberOfVoipMetricBlocks) {
+    LOG(LS_WARNING) << "Max Voip Metric blocks reached.";
+    return false;
+  }
+  voip_metric_blocks_.push_back(*voip_metric);
+  return true;
+}
+
+size_t ExtendedReports::DlrrLength() const {
+  size_t length = 0;
+  for (const Dlrr& block : dlrr_blocks_) {
+    length += block.BlockLength();
+  }
+  return length;
+}
+
+}  // namespace rtcp
+}  // namespace webrtc