2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 // Unit tests for DelayPeakDetector class.
13 #include "webrtc/modules/audio_coding/neteq/delay_peak_detector.h"
15 #include "testing/gtest/include/gtest/gtest.h"
19 TEST(DelayPeakDetector, CreateAndDestroy) {
20 DelayPeakDetector* detector = new DelayPeakDetector();
21 EXPECT_FALSE(detector->peak_found());
25 TEST(DelayPeakDetector, EmptyHistory) {
26 DelayPeakDetector detector;
27 EXPECT_EQ(-1, detector.MaxPeakHeight());
28 EXPECT_EQ(-1, detector.MaxPeakPeriod());
31 // Inject a series of packet arrivals into the detector. Three of the packets
32 // have suffered delays. After the third delay peak, peak-mode is expected to
33 // start. This should then continue until it is disengaged due to lack of peaks.
34 TEST(DelayPeakDetector, TriggerPeakMode) {
35 DelayPeakDetector detector;
36 const int kPacketSizeMs = 30;
37 detector.SetPacketAudioLength(kPacketSizeMs);
39 // Load up normal arrival times; 0 ms, 30 ms, 60 ms, 90 ms, ...
40 const int kNumPackets = 1000;
41 int arrival_times_ms[kNumPackets];
42 for (int i = 0; i < kNumPackets; ++i) {
43 arrival_times_ms[i] = i * kPacketSizeMs;
46 // Delay three packets.
47 const int kPeakDelayMs = 100;
49 arrival_times_ms[100] += kPeakDelayMs;
51 arrival_times_ms[200] += kPeakDelayMs;
52 // Third delay peak. Trigger peak-mode after this packet.
53 arrival_times_ms[400] += kPeakDelayMs;
54 // The second peak period is the longest, 200 packets.
55 const int kWorstPeakPeriod = 200 * kPacketSizeMs;
56 int peak_mode_start_ms = arrival_times_ms[400];
57 // Expect to disengage after no peaks are observed for two period times.
58 int peak_mode_end_ms = peak_mode_start_ms + 2 * kWorstPeakPeriod;
60 // Load into detector.
62 int next = 1; // Start with the second packet to get a proper IAT.
63 while (next < kNumPackets) {
64 while (next < kNumPackets && arrival_times_ms[next] <= time) {
65 int iat_packets = (arrival_times_ms[next] - arrival_times_ms[next - 1]) /
67 const int kTargetBufferLevel = 1; // Define peaks to be iat > 2.
68 if (time < peak_mode_start_ms || time > peak_mode_end_ms) {
69 EXPECT_FALSE(detector.Update(iat_packets, kTargetBufferLevel));
71 EXPECT_TRUE(detector.Update(iat_packets, kTargetBufferLevel));
72 EXPECT_EQ(kWorstPeakPeriod, detector.MaxPeakPeriod());
73 EXPECT_EQ(kPeakDelayMs / kPacketSizeMs + 1, detector.MaxPeakHeight());
77 detector.IncrementCounter(10);
78 time += 10; // Increase time 10 ms.
82 // Same test as TriggerPeakMode, but with base target buffer level increased to
83 // 2, in order to raise the bar for delay peaks to inter-arrival times > 4.
84 // The delay pattern has peaks with delay = 3, thus should not trigger.
85 TEST(DelayPeakDetector, DoNotTriggerPeakMode) {
86 DelayPeakDetector detector;
87 const int kPacketSizeMs = 30;
88 detector.SetPacketAudioLength(kPacketSizeMs);
90 // Load up normal arrival times; 0 ms, 30 ms, 60 ms, 90 ms, ...
91 const int kNumPackets = 1000;
92 int arrival_times_ms[kNumPackets];
93 for (int i = 0; i < kNumPackets; ++i) {
94 arrival_times_ms[i] = i * kPacketSizeMs;
97 // Delay three packets.
98 const int kPeakDelayMs = 100;
100 arrival_times_ms[100] += kPeakDelayMs;
101 // Second delay peak.
102 arrival_times_ms[200] += kPeakDelayMs;
104 arrival_times_ms[400] += kPeakDelayMs;
106 // Load into detector.
108 int next = 1; // Start with the second packet to get a proper IAT.
109 while (next < kNumPackets) {
110 while (next < kNumPackets && arrival_times_ms[next] <= time) {
111 int iat_packets = (arrival_times_ms[next] - arrival_times_ms[next - 1]) /
113 const int kTargetBufferLevel = 2; // Define peaks to be iat > 4.
114 EXPECT_FALSE(detector.Update(iat_packets, kTargetBufferLevel));
117 detector.IncrementCounter(10);
118 time += 10; // Increase time 10 ms.
121 } // namespace webrtc