Add sanity check for decreasing RTP timestamp in RtpToNtpMs.
The capture time for a frame (capture_ms) is set later (in ViEEncoder::IncomingCapturedFrame) than the timestamp.
Could potentially cause the RTP timestamp in consecutive RTCP SR to decrease.
Example:
// Frame1 46371: timestamp:2732, capture_ms:46373, rtcp SR ms: 46423 -> estimated current RTP timestamp:2732+(46423-46373)*90 = 7232
// Frame2 46404: timestamp:5702, capture_ms:46412, rtcp SR ms: 46428 -> estimated current RTP timestamp:5702+(46428-46412)*90 = 7142
// Diff: 33 ms: 33 ms, 39 ms, 5 ms
BUG=b/31154867
Review-Url: https://codereview.webrtc.org/2354843003
Cr-Commit-Position: refs/heads/master@{#14454}
diff --git a/webrtc/system_wrappers/source/rtp_to_ntp.cc b/webrtc/system_wrappers/source/rtp_to_ntp.cc
index 6504737..0509146 100644
--- a/webrtc/system_wrappers/source/rtp_to_ntp.cc
+++ b/webrtc/system_wrappers/source/rtp_to_ntp.cc
@@ -110,6 +110,9 @@
&rtcp_timestamp_new)) {
return false;
}
+ if (rtcp_timestamp_new < rtcp_timestamp_old)
+ return false;
+
double freq_khz;
if (!CalculateFrequency(rtcp_ntp_ms_new,
rtcp_timestamp_new,
diff --git a/webrtc/system_wrappers/source/rtp_to_ntp_unittest.cc b/webrtc/system_wrappers/source/rtp_to_ntp_unittest.cc
index 0e81e4d8..ce1f26d 100644
--- a/webrtc/system_wrappers/source/rtp_to_ntp_unittest.cc
+++ b/webrtc/system_wrappers/source/rtp_to_ntp_unittest.cc
@@ -136,6 +136,20 @@
EXPECT_FALSE(RtpToNtpMs(timestamp, rtcp, ×tamp_in_ms));
}
+TEST(RtpToNtpTests, FailsForDecreasingRtpTimestamp) {
+ const uint32_t kNtpSec1 = 3683354930;
+ const uint32_t kNtpFrac1 = 699925050;
+ const uint32_t kTimestamp1 = 2192705742;
+ const uint32_t kNtpSec2 = kNtpSec1;
+ const uint32_t kNtpFrac2 = kNtpFrac1 + kOneMsInNtpFrac;
+ const uint32_t kTimestamp2 = kTimestamp1 - kTimestampTicksPerMs;
+ RtcpList rtcp;
+ rtcp.push_front(RtcpMeasurement(kNtpSec1, kNtpFrac1, kTimestamp1));
+ rtcp.push_front(RtcpMeasurement(kNtpSec2, kNtpFrac2, kTimestamp2));
+ int64_t timestamp_in_ms = -1;
+ EXPECT_FALSE(RtpToNtpMs(kTimestamp1, rtcp, ×tamp_in_ms));
+}
+
TEST(UpdateRtcpListTests, InjectRtcpSrWithEqualNtp) {
RtcpList rtcp;
uint32_t ntp_sec = 0;