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Change aggregated fraction loss to be calculated from the cumulative loss and extended sequence number diff between the current and the last report block of two get stats calls.

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Previously it was derived from the fraction loss of the current report (which could be based on a received report block in between two get stats calls).

R=stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/36399004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7928 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
asapersson@webrtc.org 2014-12-17 10:27:57 +00:00
parent e102e8147b
commit 45a272ab22
1 changed files with 10 additions and 8 deletions
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18
webrtc/video_engine/vie_channel.cc
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@ -47,8 +47,8 @@ namespace {
RTCPReportBlock AggregateReportBlocks(
const std::vector<RTCPReportBlock>& report_blocks,
std::map<uint32_t, RTCPReportBlock>* prev_report_blocks) {
int fraction_lost_sum = 0;
int fl_seq_num_sum = 0;
int num_sequence_numbers = 0;
int num_lost_sequence_numbers = 0;
int jitter_sum = 0;
int number_of_report_blocks = 0;
RTCPReportBlock aggregate;
@ -63,18 +63,20 @@ RTCPReportBlock AggregateReportBlocks(
// weight for it.
int seq_num_diff = report_block->extendedHighSeqNum -
prev_report_block->second.extendedHighSeqNum;
if (seq_num_diff > 0) {
fraction_lost_sum += report_block->fractionLost * seq_num_diff;
fl_seq_num_sum += seq_num_diff;
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;
}
}
jitter_sum += report_block->jitter;
++number_of_report_blocks;
(*prev_report_blocks)[report_block->sourceSSRC] = *report_block;
}
if (fl_seq_num_sum > 0) {
aggregate.fractionLost =
(fraction_lost_sum + fl_seq_num_sum / 2) / fl_seq_num_sum;
if (num_sequence_numbers > 0) {
aggregate.fractionLost = ((num_lost_sequence_numbers * 255) +
(num_sequence_numbers / 2)) / num_sequence_numbers;
}
if (number_of_report_blocks > 0) {
aggregate.jitter =