Merge webrtc/video_engine/ into webrtc/video/

webrtc/video_engine/report_block_stats.cc

-/*
- *  Copyright (c) 2014 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/video_engine/report_block_stats.h"
-
-namespace webrtc {
-
-namespace {
-int FractionLost(uint32_t num_lost_sequence_numbers,
-                 uint32_t num_sequence_numbers) {
-  if (num_sequence_numbers == 0) {
-    return 0;
-  }
-  return ((num_lost_sequence_numbers * 255) + (num_sequence_numbers / 2)) /
-      num_sequence_numbers;
-}
-}  // namespace
-
-
-// Helper class for rtcp statistics.
-ReportBlockStats::ReportBlockStats()
-    : num_sequence_numbers_(0),
-      num_lost_sequence_numbers_(0) {
-}
-
-void ReportBlockStats::Store(const RtcpStatistics& rtcp_stats,
-                             uint32_t remote_ssrc,
-                             uint32_t source_ssrc) {
-  RTCPReportBlock block;
-  block.cumulativeLost = rtcp_stats.cumulative_lost;
-  block.fractionLost = rtcp_stats.fraction_lost;
-  block.extendedHighSeqNum = rtcp_stats.extended_max_sequence_number;
-  block.jitter = rtcp_stats.jitter;
-  block.remoteSSRC = remote_ssrc;
-  block.sourceSSRC = source_ssrc;
-  uint32_t num_sequence_numbers = 0;
-  uint32_t num_lost_sequence_numbers = 0;
-  StoreAndAddPacketIncrement(
-      block, &num_sequence_numbers, &num_lost_sequence_numbers);
-}
-
-RTCPReportBlock ReportBlockStats::AggregateAndStore(
-    const ReportBlockVector& report_blocks) {
-  RTCPReportBlock aggregate;
-  if (report_blocks.empty()) {
-    return aggregate;
-  }
-  uint32_t num_sequence_numbers = 0;
-  uint32_t num_lost_sequence_numbers = 0;
-  ReportBlockVector::const_iterator report_block = report_blocks.begin();
-  for (; report_block != report_blocks.end(); ++report_block) {
-    aggregate.cumulativeLost += report_block->cumulativeLost;
-    aggregate.jitter += report_block->jitter;
-    StoreAndAddPacketIncrement(*report_block,
-                               &num_sequence_numbers,
-                               &num_lost_sequence_numbers);
-  }
-
-  if (report_blocks.size() == 1) {
-    // No aggregation needed.
-    return report_blocks[0];
-  }
-  // Fraction lost since previous report block.
-  aggregate.fractionLost =
-      FractionLost(num_lost_sequence_numbers, num_sequence_numbers);
-  aggregate.jitter = static_cast<uint32_t>(
-      (aggregate.jitter + report_blocks.size() / 2) / report_blocks.size());
-  return aggregate;
-}
-
-void ReportBlockStats::StoreAndAddPacketIncrement(
-    const RTCPReportBlock& report_block,
-    uint32_t* num_sequence_numbers,
-    uint32_t* num_lost_sequence_numbers) {
-  // Get diff with previous report block.
-  ReportBlockMap::iterator prev_report_block = prev_report_blocks_.find(
-        report_block.sourceSSRC);
-  if (prev_report_block != prev_report_blocks_.end()) {
-    int seq_num_diff = report_block.extendedHighSeqNum -
-                       prev_report_block->second.extendedHighSeqNum;
-    int cum_loss_diff = report_block.cumulativeLost -
-                        prev_report_block->second.cumulativeLost;
-    if (seq_num_diff >= 0 && cum_loss_diff >= 0) {
-      *num_sequence_numbers += seq_num_diff;
-      *num_lost_sequence_numbers += cum_loss_diff;
-      // Update total number of packets/lost packets.
-      num_sequence_numbers_ += seq_num_diff;
-      num_lost_sequence_numbers_ += cum_loss_diff;
-    }
-  }
-  // Store current report block.
-  prev_report_blocks_[report_block.sourceSSRC] = report_block;
-}
-
-int ReportBlockStats::FractionLostInPercent() const {
-  if (num_sequence_numbers_ == 0) {
-    return -1;
-  }
-  return FractionLost(
-      num_lost_sequence_numbers_, num_sequence_numbers_) * 100 / 255;
-}
-
-}  // namespace webrtc
-