Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_
      12             : #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_
      13             : 
      14             : #include <string.h>  // size_t
      15             : 
      16             : #include "webrtc/base/constructormagic.h"
      17             : #include "webrtc/typedefs.h"
      18             : 
      19             : namespace webrtc {
      20             : 
      21             : // This class generates pseudo-random samples.
      22             : class RandomVector {
      23             :  public:
      24             :   static const size_t kRandomTableSize = 256;
      25             :   static const int16_t kRandomTable[kRandomTableSize];
      26             : 
      27           0 :   RandomVector()
      28           0 :       : seed_(777),
      29           0 :         seed_increment_(1) {
      30           0 :   }
      31             : 
      32             :   void Reset();
      33             : 
      34             :   void Generate(size_t length, int16_t* output);
      35             : 
      36             :   void IncreaseSeedIncrement(int16_t increase_by);
      37             : 
      38             :   // Accessors and mutators.
      39             :   int16_t seed_increment() { return seed_increment_; }
      40           0 :   void set_seed_increment(int16_t value) { seed_increment_ = value; }
      41             : 
      42             :  private:
      43             :   uint32_t seed_;
      44             :   int16_t seed_increment_;
      45             : 
      46             :   RTC_DISALLOW_COPY_AND_ASSIGN(RandomVector);
      47             : };
      48             : 
      49             : }  // namespace webrtc
      50             : #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_RANDOM_VECTOR_H_