Change name of files and class in agc/histogram* in order to avoid file-name clash.

webrtc/modules/audio_processing/agc/histogram.h

-/*
- *  Copyright (c) 2012 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.
- */
-
-#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AGC_HISTOGRAM_H_
-#define WEBRTC_MODULES_AUDIO_PROCESSING_AGC_HISTOGRAM_H_
-
-#include <string.h>
-
-#include <memory>
-
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-// This class implements the histogram of loudness with circular buffers so that
-// the histogram tracks the last T seconds of the loudness.
-class Histogram {
- public:
-  // Create a non-sliding Histogram.
-  static Histogram* Create();
-
-  // Create a sliding Histogram, i.e. the histogram represents the last
-  // |window_size| samples.
-  static Histogram* Create(int window_size);
-  ~Histogram();
-
-  // Insert RMS and the corresponding activity probability.
-  void Update(double rms, double activity_probability);
-
-  // Reset the histogram, forget the past.
-  void Reset();
-
-  // Current loudness, which is actually the mean of histogram in loudness
-  // domain.
-  double CurrentRms() const;
-
-  // Sum of the histogram content.
-  double AudioContent() const;
-
-  // Number of times the histogram has been updated.
-  int num_updates() const { return num_updates_; }
-
- private:
-  Histogram();
-  explicit Histogram(int window);
-
-  // Find the histogram bin associated with the given |rms|.
-  int GetBinIndex(double rms);
-
-  void RemoveOldestEntryAndUpdate();
-  void InsertNewestEntryAndUpdate(int activity_prob_q10, int hist_index);
-  void UpdateHist(int activity_prob_q10, int hist_index);
-  void RemoveTransient();
-
-  // Number of histogram bins.
-  static const int kHistSize = 77;
-
-  // Number of times the histogram is updated
-  int num_updates_;
-  // Audio content, this should be equal to the sum of the components of
-  // |bin_count_q10_|.
-  int64_t audio_content_q10_;
-
-  // Histogram of input RMS in Q10 with |kHistSize_| bins. In each 'Update(),'
-  // we increment the associated histogram-bin with the given probability. The
-  // increment is implemented in Q10 to avoid rounding errors.
-  int64_t bin_count_q10_[kHistSize];
-
-  // Circular buffer for probabilities
-  std::unique_ptr<int[]> activity_probability_;
-  // Circular buffer for histogram-indices of probabilities.
-  std::unique_ptr<int[]> hist_bin_index_;
-  // Current index of circular buffer, where the newest data will be written to,
-  // therefore, pointing to the oldest data if buffer is full.
-  int buffer_index_;
-  // Indicating if buffer is full and we had a wrap around.
-  int buffer_is_full_;
-  // Size of circular buffer.
-  int len_circular_buffer_;
-  int len_high_activity_;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_HISTOGRAM_H_