normal.h - mozsearch

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/*

 *  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 MODULES_AUDIO_CODING_NETEQ_NORMAL_H_

#define MODULES_AUDIO_CODING_NETEQ_NORMAL_H_

#include <stdint.h>

#include <string.h>  // Access to size_t.

#include "api/neteq/neteq.h"

#include "modules/audio_coding/neteq/statistics_calculator.h"

#include "rtc_base/checks.h"

#include "rtc_base/numerics/safe_conversions.h"

namespace webrtc {

// Forward declarations.

class AudioMultiVector;

class BackgroundNoise;

class DecoderDatabase;

class Expand;

// This class provides the "Normal" DSP operation, that is performed when

// there is no data loss, no need to stretch the timing of the signal, and

// no other "special circumstances" are at hand.

class Normal {

 public:

  Normal(int fs_hz,

         DecoderDatabase* decoder_database,

         const BackgroundNoise& background_noise,

         Expand* expand,

         StatisticsCalculator* statistics)

      : fs_hz_(fs_hz),

        decoder_database_(decoder_database),

        background_noise_(background_noise),

        expand_(expand),

        samples_per_ms_(rtc::CheckedDivExact(fs_hz_, 1000)),

        default_win_slope_Q14_(

            rtc::dchecked_cast<uint16_t>((1 << 14) / samples_per_ms_)),

        statistics_(statistics) {}

  virtual ~Normal() {}

  Normal(const Normal&) = delete;

  Normal& operator=(const Normal&) = delete;

  // Performs the "Normal" operation. The decoder data is supplied in `input`,

  // having `length` samples in total for all channels (interleaved). The

  // result is written to `output`. The number of channels allocated in

  // `output` defines the number of channels that will be used when

  // de-interleaving `input`. `last_mode` contains the mode used in the previous

  // GetAudio call (i.e., not the current one).

  int Process(const int16_t* input,

              size_t length,

              NetEq::Mode last_mode,

              AudioMultiVector* output);

 private:

  int fs_hz_;

  DecoderDatabase* decoder_database_;

  const BackgroundNoise& background_noise_;

  Expand* expand_;

  const size_t samples_per_ms_;

  const int16_t default_win_slope_Q14_;

  StatisticsCalculator* const statistics_;

};

}  // namespace webrtc

#endif  // MODULES_AUDIO_CODING_NETEQ_NORMAL_H_