Added a level indicator to new mixer.

webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc

 /*
  *  Copyright (c) 2016 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 352 matching lines @@
   participant.fake_frame()->samples_per_channel_ = 8000 / 100;
 
   EXPECT_EQ(0, mixer->SetMixabilityStatus(&participant, true));
   for (size_t number_of_channels : {1, 2}) {
     EXPECT_CALL(participant, GetAudioFrameWithMuted(_, 8000)).Times(Exactly(1));
     mixer->Mix(8000, number_of_channels, &frame_for_mixing);
     EXPECT_EQ(number_of_channels, frame_for_mixing.num_channels_);
   }
 }
 
+// Test that the volume is reported as zero when the mixer input is
+// frames with no sound.
+TEST(AudioMixer, ZeroVolume) {
+  const int kId = 1;
+  std::unique_ptr<NewAudioConferenceMixer> mixer(
+      NewAudioConferenceMixer::Create(kId));
+  AudioFrame frame_for_mixing;
+
+  MockMixerAudioSource participant;
+  participant.fake_frame()->sample_rate_hz_ = 8000;
+  participant.fake_frame()->num_channels_ = 1;
+
+  // Frame duration 10ms.
+  participant.fake_frame()->samples_per_channel_ = 8000 / 100;
+
+  EXPECT_EQ(0, mixer->SetMixabilityStatus(&participant, true));
+  for (size_t i = 0; i < 11; i++) {
+    EXPECT_CALL(participant, GetAudioFrameWithMuted(_, 8000)).Times(Exactly(1));
+    mixer->Mix(8000, 1, &frame_for_mixing);
+  }
+
+  EXPECT_EQ(static_cast<uint32_t>(0), mixer->GetSpeechOutputLevel());
+  EXPECT_EQ(static_cast<uint32_t>(0), mixer->GetSpeechOutputLevelFullRange());
+}
+
+// Test that the volume is reported as full when the mixer input is
+// full frames.
+TEST(AudioMixer, FullVolume) {
+  const int kId = 1;
+  std::unique_ptr<NewAudioConferenceMixer> mixer(
+      NewAudioConferenceMixer::Create(kId));
+  AudioFrame frame_for_mixing;
+
+  MockMixerAudioSource participant;
+  participant.fake_frame()->sample_rate_hz_ = 8000;
+  participant.fake_frame()->num_channels_ = 1;
+
+  // Frame duration 10ms.
+  participant.fake_frame()->samples_per_channel_ = 8000 / 100;
+
+  // Fill participant frame data with maximal sound.
+  std::fill(participant.fake_frame()->data_,
+            participant.fake_frame()->data_ + 8000 / 100,
+            std::numeric_limits<int16_t>::max());
+
+  EXPECT_EQ(0, mixer->SetMixabilityStatus(&participant, true));
+  for (size_t i = 0; i < 11; i++) {
+    EXPECT_CALL(participant, GetAudioFrameWithMuted(_, 8000)).Times(Exactly(1));
+    mixer->Mix(8000, 1, &frame_for_mixing);
+  }
+
+  // 9 is the highest possible audio level
+  EXPECT_EQ(static_cast<uint32_t>(9), mixer->GetSpeechOutputLevel());
+
+  // 0x7fff = 32767 is the highest full range audio level.
+  EXPECT_EQ(static_cast<uint32_t>(std::numeric_limits<int16_t>::max()),
+            mixer->GetSpeechOutputLevelFullRange());
+}
+
 TEST_F(BothMixersTest, CompareInitialFrameAudio) {
   EXPECT_CALL(participant_, GetAudioFrameWithMuted(_, _)).Times(Exactly(1));
 
   // Make sure the participant is marked as 'non-mixed' so that it is
   // ramped in next round.
   ResetAudioSource();
 
   // Construct the expected sound for the first mixing round.
   mixing_round_frame.CopyFrom(*participant_.fake_frame());
   RampIn(mixing_round_frame);
@@ skipping 91 matching lines @@
                      MixerParticipant::AudioFrameInfo::kMuted);
     } else {
       AddParticipant(&audio_frames[i],
                      MixerParticipant::AudioFrameInfo::kNormal);
     }
     MixAndCompare();
   }
 }
 
 }  // namespace webrtc