fix comment

speechx/speechx/frontend/audio/audio_cache.h

@@ -30,7 +30,8 @@ class AudioCache : public FrontendInterface {
 
     virtual bool Read(kaldi::Vector<kaldi::BaseFloat>* waves);
 
-    // the audio dim is 1, one sample, we return size_ instead.
+    // the audio dim is 1, one sample, which is useless, 
+    // so we return size_(cache samples) instead.
     virtual size_t Dim() const { return size_; }
 
     virtual void SetFinished() {

speechx/speechx/frontend/audio/feature_common.h

@@ -25,7 +25,7 @@ class StreamingFeatureTpl : public FrontendInterface {
     typedef typename F::Options Options;
     StreamingFeatureTpl(const Options& opts, 
                         std::unique_ptr<FrontendInterface> base_extractor);
-    virtual void Accept(const kaldi::VectorBase<kaldi::BaseFloat>& inputs);
+    virtual void Accept(const kaldi::VectorBase<kaldi::BaseFloat>& waves);
     virtual bool Read(kaldi::Vector<kaldi::BaseFloat>* feats);
     
     // the dim_ is the dim of single frame feature
@@ -51,4 +51,4 @@ class StreamingFeatureTpl : public FrontendInterface {
 
 }  // namespace ppspeech
 
-#include "frontend/audio/feature_common_inl.h"
\ No newline at end of file
+#include "frontend/audio/feature_common_inl.h"

speechx/speechx/frontend/audio/feature_common_inl.h

@@ -25,8 +25,8 @@ StreamingFeatureTpl<F>::StreamingFeatureTpl(const Options& opts,
 }
 
 template <class F>
-void StreamingFeatureTpl<F>::Accept(const kaldi::VectorBase<kaldi::BaseFloat>& inputs) {
-    base_extractor_->Accept(inputs);
+void StreamingFeatureTpl<F>::Accept(const kaldi::VectorBase<kaldi::BaseFloat>& waves) {
+    base_extractor_->Accept(waves);
 }
 
 template <class F>
@@ -92,4 +92,4 @@ bool StreamingFeatureTpl<F>::Compute(const kaldi::Vector<kaldi::BaseFloat>& wave
     return true;
 }
 
-}  // namespace ppspeech
\ No newline at end of file
+}  // namespace ppspeech