Rewrote UpdateToMix in the audio mixer.

webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc

Index: webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
diff --git a/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc b/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
index 447724080d541bdbe7a5b876f546b37b60f1542e..8e4d0fc1edc540f3329649a72e464e5d222c2876 100644
--- a/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
+++ b/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
@@ -9,9 +9,12 @@
  */
 
 #include <memory>
+#include <utility>
 
 #include "testing/gmock/include/gmock/gmock.h"
 
+#include "webrtc/modules/audio_conference_mixer/include/audio_conference_mixer.h"
+#include "webrtc/modules/audio_conference_mixer/include/audio_conference_mixer_defines.h"
 #include "webrtc/modules/audio_conference_mixer/source/audio_frame_manipulator.h"
 #include "webrtc/modules/audio_mixer/audio_mixer.h"
 #include "webrtc/modules/audio_mixer/include/audio_mixer_defines.h"
@@ -26,30 +29,154 @@ using testing::Return;
 using webrtc::voe::AudioMixer;
 
 namespace webrtc {
+class MockAudioMixerParticipant : public MixerParticipant {
+ public:
+  MockAudioMixerParticipant()
+      : fake_audio_frame_info_(MixerParticipant::AudioFrameInfo::kNormal) {
+    ON_CALL(*this, GetAudioFrameWithMuted(_, _))
+        .WillByDefault(
+            Invoke(this, &MockAudioMixerParticipant::FakeAudioFrameWithMuted));
+  }
+
+  MOCK_METHOD2(GetAudioFrameWithMuted,
+               AudioFrameInfo(const int32_t id, AudioFrame* audio_frame));
+  MOCK_CONST_METHOD1(NeededFrequency, int32_t(const int32_t id));
+
+  AudioFrame* fake_frame() { return &fake_frame_; }
+  AudioFrameInfo fake_info() { return this->fake_audio_frame_info_; }
+  void set_fake_info(const AudioFrameInfo audio_frame_info) {
+    fake_audio_frame_info_ = audio_frame_info;
+  }
+
+ private:
+  AudioFrame fake_frame_;
+  AudioFrameInfo fake_audio_frame_info_;
+  AudioFrameInfo FakeAudioFrameWithMuted(const int32_t id,
+                                         AudioFrame* audio_frame) {
+    audio_frame->CopyFrom(*fake_frame());
+    return fake_info();
+  }
+};
+
 class MockMixerAudioSource : public MixerAudioSource {
  public:
-  MockMixerAudioSource() {
+  MockMixerAudioSource()
+      : fake_audio_frame_info_(MixerAudioSource::AudioFrameInfo::kNormal) {
     ON_CALL(*this, GetAudioFrameWithMuted(_, _))
         .WillByDefault(
             Invoke(this, &MockMixerAudioSource::FakeAudioFrameWithMuted));
   }
+
   MOCK_METHOD2(GetAudioFrameWithMuted,
-               AudioFrameWithInfo(const int32_t id, int sample_rate_hz));
+               AudioFrameWithMuted(const int32_t id, int sample_rate_hz));
   MOCK_CONST_METHOD1(NeededFrequency, int32_t(const int32_t id));
 
   AudioFrame* fake_frame() { return &fake_frame_; }
+  AudioFrameInfo fake_info() { return fake_audio_frame_info_; }
+  void set_fake_info(const AudioFrameInfo audio_frame_info) {
+    fake_audio_frame_info_ = audio_frame_info;
+  }
 
  private:
   AudioFrame fake_frame_;
-  AudioFrameWithInfo FakeAudioFrameWithMuted(const int32_t id,
-                                             int sample_rate_hz) {
+  AudioFrameInfo fake_audio_frame_info_;
+  AudioFrameWithMuted FakeAudioFrameWithMuted(const int32_t id,
+                                              int sample_rate_hz) {
     return {
-        fake_frame(),             // audio_frame_pointer
-        AudioFrameInfo::kNormal,  // audio_frame_info
+        fake_frame(),  // audio_frame_pointer
+        fake_info(),   // audio_frame_info
     };
   }
 };
 
+// Keeps two identical sets of participants and two mixers to test
+// that the same participants are chosen for mixing.
+class CompareWithOldMixerTest : public testing::Test, AudioMixerOutputReceiver {
+ protected:
+  constexpr static int kId = 1;
+  constexpr static int kSampleRateHz = 32000;
+
+  CompareWithOldMixerTest()
+      : old_mixer_(AudioConferenceMixer::Create(kId)),
+        new_mixer_(NewAudioConferenceMixer::Create(kId)) {}
+
+  ~CompareWithOldMixerTest() { Reset(); }
+
+  // Mixes with both mixers and compares results: resulting frames and
+  // mix statuses.
+  void MixAndCompare() {
+    old_mixer_->Process();
+    new_mixer_->Mix(&new_mixer_frame_);
+    EXPECT_EQ(0, memcmp(old_mixer_frame_.data_, new_mixer_frame_.data_,
+                        sizeof(old_mixer_frame_.data_)));
+
+    for (auto& participant_pair : participants_) {
+      EXPECT_EQ(participant_pair.first->IsMixed(),
+                participant_pair.second->IsMixed());
+    }
+  }
+
+  std::unique_ptr<AudioFrame> last_mixed_audio_old() {
+    std::unique_ptr<AudioFrame> result(new AudioFrame);
+    result->CopyFrom(old_mixer_frame_);
+    return result;
+  }
+
+  void Reset() {
+    old_mixer_.reset(AudioConferenceMixer::Create(kId));
+    new_mixer_.reset(NewAudioConferenceMixer::Create(kId));
+    for (auto& participant_pair : participants_) {
+      delete participant_pair.first;
+      delete participant_pair.second;
+    }
+    participants_.clear();
+  }
+
+  void ResetFrame(AudioFrame* audio_frame) {
+    audio_frame->sample_rate_hz_ = kSampleRateHz;
+    audio_frame->speech_type_ = AudioFrame::kNormalSpeech;
+    audio_frame->vad_activity_ = AudioFrame::kVadActive;
+    audio_frame->num_channels_ = 1;
+  }
+
+  void AddParticipant(AudioFrame* audio_frame,
+                      MixerParticipant::AudioFrameInfo audio_frame_info) {
+    auto old_participant = new MockAudioMixerParticipant;
+    auto new_participant = new MockMixerAudioSource;
+    old_participant->fake_frame()->CopyFrom(*audio_frame);
+    new_participant->fake_frame()->CopyFrom(*audio_frame);
+    old_participant->set_fake_info(audio_frame_info);
+    MixerAudioSource::AudioFrameInfo new_audio_frame_info;
+    switch (audio_frame_info) {
+      case MixerParticipant::AudioFrameInfo::kNormal:
+        new_audio_frame_info = MixerAudioSource::AudioFrameInfo::kNormal;
+        break;
+      case MixerParticipant::AudioFrameInfo::kMuted:
+        new_audio_frame_info = MixerAudioSource::AudioFrameInfo::kMuted;
+        break;
+      default:
+        new_audio_frame_info = MixerAudioSource::AudioFrameInfo::kError;
+    }
+    new_participant->set_fake_info(new_audio_frame_info);
+    participants_.emplace_back(old_participant, new_participant);
+  }
+
+  void NewMixedAudio(const int32_t id,
+                     const AudioFrame& generalAudioFrame,
+                     const AudioFrame** uniqueAudioFrames,
+                     const uint32_t size) override {
+    old_mixer_frame_.CopyFrom(generalAudioFrame);
+  }
+
+  AudioFrame old_mixer_frame_;
+  AudioFrame new_mixer_frame_;
+
+  std::vector<std::pair<MockAudioMixerParticipant*, MockMixerAudioSource*>>
+      participants_;
+  std::unique_ptr<AudioConferenceMixer> old_mixer_;
+  std::unique_ptr<NewAudioConferenceMixer> new_mixer_;
+};
+
 class BothMixersTest : public testing::Test {
  protected:
   BothMixersTest() {
@@ -246,4 +373,71 @@ TEST_F(BothMixersTest, CompareSecondFrameAudio) {
                    sizeof(mixing_round_frame.data_)));
 }
 
+TEST_F(CompareWithOldMixerTest, TwoParticipantsNormalFrames) {
+  Reset();
+  AudioFrame first_frame, second_frame;
+
+  ResetFrame(&first_frame);
+  ResetFrame(&second_frame);
+
+  first_frame.id_ = 1;
+  second_frame.id_ = 2;
+
+  AddParticipant(&first_frame, MixerParticipant::AudioFrameInfo::kNormal);
+  AddParticipant(&second_frame, MixerParticipant::AudioFrameInfo::kNormal);
+
+  for (int i = 0; i < 3; ++i) {
+    MixAndCompare();
+  }
+}
+
+TEST_F(CompareWithOldMixerTest, ThreeParticipantsDifferentFrames) {
+  Reset();
+  AudioFrame first_frame, second_frame, third_frame;
+
+  ResetFrame(&first_frame);
+  ResetFrame(&second_frame);
+  ResetFrame(&third_frame);
+
+  first_frame.id_ = 1;
+  second_frame.id_ = 2;
+  third_frame.id_ = 3;
+  second_frame.vad_activity_ = AudioFrame::kVadPassive;
+
+  AddParticipant(&first_frame, MixerParticipant::AudioFrameInfo::kNormal);
+  AddParticipant(&second_frame, MixerParticipant::AudioFrameInfo::kMuted);
+  AddParticipant(&third_frame, MixerParticipant::AudioFrameInfo::kMuted);
+
+  for (int i = 0; i < 3; ++i) {
+    MixAndCompare();
+  }
+}
+
+TEST_F(CompareWithOldMixerTest, ManyParticipantsDifferentFrames) {
+  Reset();
+  constexpr int num_participants = 20;
+  AudioFrame audio_frames[num_participants];
+
+  for (int i = 0; i < num_participants; ++i) {
+    ResetFrame(&audio_frames[i]);
+    audio_frames[i].id_ = 1;
+    audio_frames[i].data_[10] = 100 * (i % 5);
+    audio_frames[i].data_[100] = 100 * (i % 5);
+    if (i % 2 == 0) {
+      audio_frames[i].vad_activity_ = AudioFrame::kVadPassive;
+    }
+  }
+
+  for (int i = 0; i < num_participants; ++i) {
+    if (i % 2 == 0) {
+      AddParticipant(&audio_frames[i],
+                     MixerParticipant::AudioFrameInfo::kMuted);
+    } else {
+      AddParticipant(&audio_frames[i],
+                     MixerParticipant::AudioFrameInfo::kNormal);
+    }
+    MixAndCompare();
+  }
+}
+
 }  // namespace webrtc