1 files changed, 121 insertions, 0 deletions
diff --git a/chromium/third_party/webrtc/modules/audio_coding/neteq/delay_peak_detector_unittest.cc b/chromium/third_party/webrtc/modules/audio_coding/neteq/delay_peak_detector_unittest.cc
new file mode 100644
index 00000000000..080309be014
--- /dev/null
+++ b/chromium/third_party/webrtc/modules/audio_coding/neteq/delay_peak_detector_unittest.cc
@@ -0,0 +1,121 @@
+/*
+ *  Copyright (c) 2012 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.
+ */
+
+// Unit tests for DelayPeakDetector class.
+
+#include "webrtc/modules/audio_coding/neteq/delay_peak_detector.h"
+
+#include "gtest/gtest.h"
+
+namespace webrtc {
+
+TEST(DelayPeakDetector, CreateAndDestroy) {
+  DelayPeakDetector* detector = new DelayPeakDetector();
+  EXPECT_FALSE(detector->peak_found());
+  delete detector;
+}
+
+TEST(DelayPeakDetector, EmptyHistory) {
+  DelayPeakDetector detector;
+  EXPECT_EQ(-1, detector.MaxPeakHeight());
+  EXPECT_EQ(-1, detector.MaxPeakPeriod());
+}
+
+// Inject a series of packet arrivals into the detector. Three of the packets
+// have suffered delays. After the third delay peak, peak-mode is expected to
+// start. This should then continue until it is disengaged due to lack of peaks.
+TEST(DelayPeakDetector, TriggerPeakMode) {
+  DelayPeakDetector detector;
+  const int kPacketSizeMs = 30;
+  detector.SetPacketAudioLength(kPacketSizeMs);
+
+  // Load up normal arrival times; 0 ms, 30 ms, 60 ms, 90 ms, ...
+  const int kNumPackets = 1000;
+  int arrival_times_ms[kNumPackets];
+  for (int i = 0; i < kNumPackets; ++i) {
+    arrival_times_ms[i] = i * kPacketSizeMs;
+  }
+
+  // Delay three packets.
+  const int kPeakDelayMs = 100;
+  // First delay peak.
+  arrival_times_ms[100] += kPeakDelayMs;
+  // Second delay peak.
+  arrival_times_ms[200] += kPeakDelayMs;
+  // Third delay peak. Trigger peak-mode after this packet.
+  arrival_times_ms[400] += kPeakDelayMs;
+  // The second peak period is the longest, 200 packets.
+  const int kWorstPeakPeriod = 200 * kPacketSizeMs;
+  int peak_mode_start_ms = arrival_times_ms[400];
+  // Expect to disengage after no peaks are observed for two period times.
+  int peak_mode_end_ms = peak_mode_start_ms + 2 * kWorstPeakPeriod;
+
+  // Load into detector.
+  int time = 0;
+  int next = 1;  // Start with the second packet to get a proper IAT.
+  while (next < kNumPackets) {
+    while (next < kNumPackets && arrival_times_ms[next] <= time) {
+      int iat_packets = (arrival_times_ms[next] - arrival_times_ms[next - 1]) /
+          kPacketSizeMs;
+      const int kTargetBufferLevel = 1;  // Define peaks to be iat > 2.
+      if (time < peak_mode_start_ms || time > peak_mode_end_ms) {
+        EXPECT_FALSE(detector.Update(iat_packets, kTargetBufferLevel));
+      } else {
+        EXPECT_TRUE(detector.Update(iat_packets, kTargetBufferLevel));
+        EXPECT_EQ(kWorstPeakPeriod, detector.MaxPeakPeriod());
+        EXPECT_EQ(kPeakDelayMs / kPacketSizeMs + 1, detector.MaxPeakHeight());
+      }
+      ++next;
+    }
+    detector.IncrementCounter(10);
+    time += 10;  // Increase time 10 ms.
+  }
+}
+
+// Same test as TriggerPeakMode, but with base target buffer level increased to
+// 2, in order to raise the bar for delay peaks to inter-arrival times > 4.
+// The delay pattern has peaks with delay = 3, thus should not trigger.
+TEST(DelayPeakDetector, DoNotTriggerPeakMode) {
+  DelayPeakDetector detector;
+  const int kPacketSizeMs = 30;
+  detector.SetPacketAudioLength(kPacketSizeMs);
+
+  // Load up normal arrival times; 0 ms, 30 ms, 60 ms, 90 ms, ...
+  const int kNumPackets = 1000;
+  int arrival_times_ms[kNumPackets];
+  for (int i = 0; i < kNumPackets; ++i) {
+    arrival_times_ms[i] = i * kPacketSizeMs;
+  }
+
+  // Delay three packets.
+  const int kPeakDelayMs = 100;
+  // First delay peak.
+  arrival_times_ms[100] += kPeakDelayMs;
+  // Second delay peak.
+  arrival_times_ms[200] += kPeakDelayMs;
+  // Third delay peak.
+  arrival_times_ms[400] += kPeakDelayMs;
+
+  // Load into detector.
+  int time = 0;
+  int next = 1;  // Start with the second packet to get a proper IAT.
+  while (next < kNumPackets) {
+    while (next < kNumPackets && arrival_times_ms[next] <= time) {
+      int iat_packets = (arrival_times_ms[next] - arrival_times_ms[next - 1]) /
+          kPacketSizeMs;
+      const int kTargetBufferLevel = 2;  // Define peaks to be iat > 4.
+      EXPECT_FALSE(detector.Update(iat_packets, kTargetBufferLevel));
+      ++next;
+    }
+    detector.IncrementCounter(10);
+    time += 10;  // Increase time 10 ms.
+  }
+}
+}  // namespace webrtc