NetEq: Add functionality to assist with delay analysis and tooling

webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc

 /*
  *  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.
  */
 
@@ skipping 1253 matching lines @@
   UseNoMocks();
   CreateInstance();
   ASSERT_TRUE(tick_timer_);
   EXPECT_EQ(0u, tick_timer_->ticks());
   AudioFrame output;
   bool muted;
   EXPECT_EQ(NetEq::kOK, neteq_->GetAudio(&output, &muted));
   EXPECT_EQ(1u, tick_timer_->ticks());
 }
 
+TEST_F(NetEqImplTest, TargetDelayMs) {
+  UseNoMocks();
+  use_mock_delay_manager_ = true;
+  CreateInstance();
+  // Let the dummy target delay be 17 packets.
+  constexpr int kTargetLevelPacketsQ8 = 17 << 8;
+  EXPECT_CALL(*mock_delay_manager_, TargetLevel())
+      .WillOnce(Return(kTargetLevelPacketsQ8));
+  // Default packet size before any packet has been decoded is 30 ms, so we are
+  // expecting 17 * 30 = 510 ms target delay.
+  EXPECT_EQ(17 * 30, neteq_->TargetDelayMs());
+}
+
 class Decoder120ms : public AudioDecoder {
  public:
   Decoder120ms(int sample_rate_hz, SpeechType speech_type)
       : sample_rate_hz_(sample_rate_hz),
         next_value_(1),
         speech_type_(speech_type) {}
 
   int DecodeInternal(const uint8_t* encoded,
                      size_t encoded_len,
                      int sample_rate_hz,
@@ skipping 205 matching lines @@
   EXPECT_CALL(*mock_delay_manager_, BufferLimits(_, _))
       .Times(1)
       .WillOnce(DoAll(SetArgPointee<0>(1), SetArgPointee<1>(2)));
 
   bool muted;
   EXPECT_EQ(NetEq::kOK, neteq_->GetAudio(&output_, &muted));
   EXPECT_EQ(kAccelerate, neteq_->last_operation_for_test());
 }
 
 }// namespace webrtc