Compensate for the IntelligibilityEnhancer processing delay in high bands

webrtc/common_audio/lapped_transform.h

 /*
  *  Copyright (c) 2014 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 68 matching lines @@
 
   // Get the number of output channels.
   //
   // This is the number of arrays that must be passed to ProcessChunk via
   // out_chunk.
   //
   // Returns the same num_out_channels passed to the LappedTransform
   // constructor.
   size_t num_out_channels() const { return num_out_channels_; }
 
+  // Get the initial delay.
+  //
+  // This is the delay introduced by the |blocker_| to be able to get and return
+  // chunks of |chunk_length|, but process blocks of |block_length|.
+  size_t initial_delay() const { return blocker_.initial_delay(); }
+
  private:
   // Internal middleware callback, given to the blocker. Transforms each block
   // and hands it over to the processing method given at construction time.
   class BlockThunk : public BlockerCallback {
    public:
     explicit BlockThunk(LappedTransform* parent) : parent_(parent) {}
 
  void ProcessBlock(const float* const* input,
                               size_t num_frames,
                               size_t num_input_channels,
@@ skipping 17 matching lines @@
   const size_t cplx_length_;
   AlignedArray<float> real_buf_;
   AlignedArray<std::complex<float> > cplx_pre_;
   AlignedArray<std::complex<float> > cplx_post_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_AUDIO_LAPPED_TRANSFORM_H_