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-// itf/online-feature-itf.h
-
-// Copyright    2013  Johns Hopkins University (author: Daniel Povey)
-
-// See ../../COPYING for clarification regarding multiple authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//  http://www.apache.org/licenses/LICENSE-2.0
-//
-// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
-// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
-// MERCHANTABLITY OR NON-INFRINGEMENT.
-// See the Apache 2 License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef KALDI_ITF_ONLINE_FEATURE_ITF_H_
-#define KALDI_ITF_ONLINE_FEATURE_ITF_H_ 1
-#include "base/kaldi-common.h"
-#include "matrix/matrix-lib.h"
-
-namespace kaldi {
-/// @ingroup Interfaces
-/// @{
-
-/**
-   OnlineFeatureInterface is an interface for online feature processing (it is
-   also usable in the offline setting, but currently we're not using it for
-   that).  This is for use in the online2/ directory, and it supersedes the
-   interface in ../online/online-feat-input.h.  We have a slighty different
-   model that puts more control in the hands of the calling thread, and won't
-   involve waiting on semaphores in the decoding thread.
-
-   This interface only specifies how the object *outputs* the features.
-   How it obtains the features, e.g. from a previous object or objects of type
-   OnlineFeatureInterface, is not specified in the interface and you will
-   likely define new constructors or methods in the derived type to do that.
-
-   You should appreciate that this interface is designed to allow random
-   access to features, as long as they are ready.  That is, the user
-   can call GetFrame for any frame less than NumFramesReady(), and when
-   implementing a child class you must not make assumptions about the
-   order in which the user makes these calls.
-*/
-   
-class OnlineFeatureInterface {
- public:
-  virtual int32 Dim() const = 0; /// returns the feature dimension.
-  
-  /// Returns the total number of frames, since the start of the utterance, that
-  /// are now available.  In an online-decoding context, this will likely
-  /// increase with time as more data becomes available.
-  virtual int32 NumFramesReady() const = 0;
-
-  /// Returns true if this is the last frame.  Frame indices are zero-based, so the
-  /// first frame is zero.  IsLastFrame(-1) will return false, unless the file
-  /// is empty (which is a case that I'm not sure all the code will handle, so
-  /// be careful).  This function may return false for some frame if
-  /// we haven't yet decided to terminate decoding, but later true if we decide
-  /// to terminate decoding.  This function exists mainly to correctly handle
-  /// end effects in feature extraction, and is not a mechanism to determine how
-  /// many frames are in the decodable object (as it used to be, and for backward
-  /// compatibility, still is, in the Decodable interface).
-  virtual bool IsLastFrame(int32 frame) const = 0;
-  
-  /// Gets the feature vector for this frame.  Before calling this for a given
-  /// frame, it is assumed that you called NumFramesReady() and it returned a
-  /// number greater than "frame".  Otherwise this call will likely crash with
-  /// an assert failure.  This function is not declared const, in case there is
-  /// some kind of caching going on, but most of the time it shouldn't modify
-  /// the class.
-  virtual void GetFrame(int32 frame, VectorBase<BaseFloat> *feat) = 0;
-
-  /// Virtual destructor.  Note: constructors that take another member of
-  /// type OnlineFeatureInterface are not expected to take ownership of
-  /// that pointer; the caller needs to keep track of that manually.
-  virtual ~OnlineFeatureInterface() { }  
-};
-
-
-/// Add a virtual class for "source" features such as MFCC or PLP or pitch
-/// features.
-class OnlineBaseFeature: public OnlineFeatureInterface {
- public:
-  /// This would be called from the application, when you get more wave data.
-  /// Note: the sampling_rate is typically only provided so the code can assert
-  /// that it matches the sampling rate expected in the options.
-  virtual void AcceptWaveform(BaseFloat sampling_rate,
-                              const VectorBase<BaseFloat> &waveform) = 0;
-
-  /// InputFinished() tells the class you won't be providing any
-  /// more waveform.  This will help flush out the last few frames
-  /// of delta or LDA features (it will typically affect the return value
-  /// of IsLastFrame.
-  virtual void InputFinished() = 0;
-};
-
-
-/// @}
-}  // namespace Kaldi
-
-#endif  // KALDI_ITF_ONLINE_FEATURE_ITF_H_