Conversational speech tool, simualtor + unit tests

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

Index: webrtc/modules/audio_processing/test/conversational_speech/multiend_call.cc
diff --git a/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.cc b/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.cc
index ce8b60b466044c58023a7752d31a97bde1d9d7da..ac24b969d81e6cfe8ec9a1f3cd35450f38050daf 100644
--- a/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.cc
+++ b/webrtc/modules/audio_processing/test/conversational_speech/multiend_call.cc
@@ -21,10 +21,11 @@ MultiEndCall::MultiEndCall(
     rtc::ArrayView<const Turn> timing, const std::string& audiotracks_path,
     std::unique_ptr<WavReaderAbstractFactory> wavreader_abstract_factory)
         : timing_(timing), audiotracks_path_(audiotracks_path),
-          wavreader_abstract_factory_(std::move(wavreader_abstract_factory)) {
+          wavreader_abstract_factory_(std::move(wavreader_abstract_factory)),
+          valid_(false) {
   FindSpeakerNames();
-  CreateAudioTrackReaders();
-  valid_ = CheckTiming();
+  if (CreateAudioTrackReaders())
+    valid_ = CheckTiming();
 }
 
 MultiEndCall::~MultiEndCall() = default;
@@ -42,6 +43,10 @@ bool MultiEndCall::valid() const {
   return valid_;
 }
 
+int MultiEndCall::sample_rate() const {
+  return sample_rate_;
+}
+
 std::size_t MultiEndCall::total_duration_samples() const {
   return total_duration_samples_;
 }
@@ -58,8 +63,9 @@ void MultiEndCall::FindSpeakerNames() {
   }
 }
 
-void MultiEndCall::CreateAudioTrackReaders() {
+bool MultiEndCall::CreateAudioTrackReaders() {
   RTC_DCHECK(audiotrack_readers_.empty());
+  sample_rate_ = 0;  // Sample rate will be set when reading the first track.
   for (const Turn& turn : timing_) {
     auto it = audiotrack_readers_.find(turn.audiotrack_file_name);
     if (it != audiotrack_readers_.end())
@@ -72,9 +78,24 @@ void MultiEndCall::CreateAudioTrackReaders() {
     // Map the audiotrack file name to a new instance of WavReaderInterface.
     std::unique_ptr<WavReaderInterface> wavreader =
         wavreader_abstract_factory_->Create(audiotrack_file_path.pathname());
+
+    if (sample_rate_ == 0) {
+      sample_rate_ = wavreader->SampleRate();
+    } else if (sample_rate_ != wavreader->SampleRate()) {
+      LOG(LS_ERROR) << "all the audio tracks should have the same sample rate";
+      return false;
+    }
+
+    if (wavreader->NumChannels() != 1) {
+      LOG(LS_ERROR) << "only mono audio tracks supported";
+      return false;
+    }
+
     audiotrack_readers_.emplace(
         turn.audiotrack_file_name, std::move(wavreader));
   }
+
+  return true;
 }
 
 bool MultiEndCall::CheckTiming() {