block_framer.h - mozsearch

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/*

 *  Copyright (c) 2016 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_PROCESSING_AEC3_BLOCK_FRAMER_H_

#define MODULES_AUDIO_PROCESSING_AEC3_BLOCK_FRAMER_H_

#include <vector>

#include "api/array_view.h"

#include "modules/audio_processing/aec3/aec3_common.h"

#include "modules/audio_processing/aec3/block.h"

namespace webrtc {

// Class for producing frames consisting of 2 subframes of 80 samples each

// from 64 sample blocks. The class is designed to work together with the

// FrameBlocker class which performs the reverse conversion. Used together with

// that, this class produces output frames are the same rate as frames are

// received by the FrameBlocker class. Note that the internal buffers will

// overrun if any other rate of packets insertion is used.

class BlockFramer {

 public:

  BlockFramer(size_t num_bands, size_t num_channels);

  ~BlockFramer();

  BlockFramer(const BlockFramer&) = delete;

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

  // Adds a 64 sample block into the data that will form the next output frame.

  void InsertBlock(const Block& block);

  // Adds a 64 sample block and extracts an 80 sample subframe.

  void InsertBlockAndExtractSubFrame(

      const Block& block,

      std::vector<std::vector<rtc::ArrayView<float>>>* sub_frame);

 private:

  const size_t num_bands_;

  const size_t num_channels_;

  std::vector<std::vector<std::vector<float>>> buffer_;

};

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_AEC3_BLOCK_FRAMER_H_