Conversational speech tool, simualtor + unit tests

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

Index: webrtc/modules/audio_processing/test/conversational_speech/multiend_call.h
diff --git a/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.h b/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.h
index 6dae8220661e5d41ec909dc9a2e923e6f08e827e..5efe3258061733a0c02c225f391317ee2627b9b2 100644
--- a/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.h
+++ b/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.h
@@ -53,6 +53,7 @@ class MultiEndCall {
   const std::map<std::string, std::unique_ptr<WavReaderInterface>>&
       audiotrack_readers() const;
   bool valid() const;
+  int sample_rate() const;
   std::size_t total_duration_samples() const;
   const std::vector<SpeakingTurn>& speaking_turns() const;
 
@@ -60,8 +61,10 @@ class MultiEndCall {
   // 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.
@@ -79,6 +82,7 @@ class MultiEndCall {
   std::map<std::string, std::unique_ptr<WavReaderInterface>>
       audiotrack_readers_;
   bool valid_;
+  int sample_rate_;
   std::size_t total_duration_samples_;
   std::vector<SpeakingTurn> speaking_turns_;