Reland of Conversational speech tool, simualtor + unit tests

webrtc/modules/audio_processing/test/conversational_speech/multiend_call.h

 /*
  *  Copyright (c) 2017 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 32 matching lines @@
     std::string audiotrack_file_name;
     size_t begin;
     size_t end;
   };
 
   MultiEndCall(
       rtc::ArrayView<const Turn> timing, const std::string& audiotracks_path,
       std::unique_ptr<WavReaderAbstractFactory> wavreader_abstract_factory);
   ~MultiEndCall();
 
-  const std::set<std::string>& speaker_names() const;
+  const std::set<std::string>& speaker_names() const { return speaker_names_; }
   const std::map<std::string, std::unique_ptr<WavReaderInterface>>&
-      audiotrack_readers() const;
-  bool valid() const;
-  size_t total_duration_samples() const;
-  const std::vector<SpeakingTurn>& speaking_turns() const;
+      audiotrack_readers() const { return audiotrack_readers_; }
+  bool valid() const { return valid_; }
+  int sample_rate() const { return sample_rate_hz_; }
+  size_t total_duration_samples() const { return total_duration_samples_; }
+  const std::vector<SpeakingTurn>& speaking_turns() const {
+      return speaking_turns_; }
 
  private:
   // Finds unique speaker names.
   void FindSpeakerNames();
 
-  // Creates one WavReader instance for each unique audiotrack.
-  void CreateAudioTrackReaders();
+  // Creates one WavReader instance for each unique audiotrack. It returns false
+  // if the audio tracks do not have the same sample rate or if they are not
+  // mono.
+  bool CreateAudioTrackReaders();
 
   // Validates the speaking turns timing information. Accepts cross-talk, but
   // only up to 2 speakers. Rejects unordered turns and self cross-talk.
   bool CheckTiming();
 
   rtc::ArrayView<const Turn> timing_;
   const std::string& audiotracks_path_;
   std::unique_ptr<WavReaderAbstractFactory> wavreader_abstract_factory_;
   std::set<std::string> speaker_names_;
   std::map<std::string, std::unique_ptr<WavReaderInterface>>
       audiotrack_readers_;
   bool valid_;
+  int sample_rate_hz_;
   size_t total_duration_samples_;
   std::vector<SpeakingTurn> speaking_turns_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(MultiEndCall);
 };
 
 }  // namespace conversational_speech
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TEST_CONVERSATIONAL_SPEECH_MULTIEND_CALL_H_