text: /*
   *  Copyright (c) 2013 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_CODING_NETEQ4_TOOLS_INPUT_AUDIO_FILE_H_
  #define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_TOOLS_INPUT_AUDIO_FILE_H_
  
  #include <cstdio>
  #include <string>
  
  #include "webrtc/system_wrappers/interface/constructor_magic.h"
  #include "webrtc/typedefs.h"
  
  namespace webrtc {
  namespace test {
  
  // Class for handling a looping input audio file.
  class InputAudioFile {
   public:
    explicit InputAudioFile(const std::string file_name) {
      fp_ = fopen(file_name.c_str(), "rb");
    }
  
    virtual ~InputAudioFile() {
      fclose(fp_);
    }
  
    // Reads |samples| elements from source file to |destination|. Returns true
    // if the read was successful, otherwise false. If the file end is reached,
    // the file is rewound and reading continues from the beginning.
    // The output |destination| must have the capacity to hold |samples| elements.
    bool Read(size_t samples, int16_t* destination);
  
    // Creates a multi-channel signal from a mono signal. Each sample is repeated
    // |channels| times to create an interleaved multi-channel signal where all
    // channels are identical. The output |destination| must have the capacity to
    // hold samples * channels elements.
    static void DuplicateInterleaved(const int16_t* source, size_t samples,
                                     size_t channels, int16_t* destination);
  
   private:
    FILE* fp_;
    DISALLOW_COPY_AND_ASSIGN(InputAudioFile);
  };
  
  }  // namespace test
  }  // namespace webrtc
  #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ4_TOOLS_INPUT_AUDIO_FILE_H_
  