1 /*
2  *  Copyright (c) 2016 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 MODULES_AUDIO_PROCESSING_AEC3_BLOCK_FRAMER_H_
12 #define MODULES_AUDIO_PROCESSING_AEC3_BLOCK_FRAMER_H_
13 
14 #include <vector>
15 
16 #include "api/array_view.h"
17 #include "modules/audio_processing/aec3/aec3_common.h"
18 #include "rtc_base/constructormagic.h"
19 
20 namespace webrtc {
21 
22 // Class for producing frames consisting of 1 or 2 subframes of 80 samples each
23 // from 64 sample blocks. The class is designed to work together with the
24 // FrameBlocker class which performs the reverse conversion. Used together with
25 // that, this class produces output frames are the same rate as frames are
26 // received by the FrameBlocker class. Note that the internal buffers will
27 // overrun if any other rate of packets insertion is used.
28 class BlockFramer {
29  public:
30   explicit BlockFramer(size_t num_bands);
31   ~BlockFramer();
32   // Adds a 64 sample block into the data that will form the next output frame.
33   void InsertBlock(const std::vector<std::vector<float>>& block);
34   // Adds a 64 sample block and extracts an 80 sample subframe.
35   void InsertBlockAndExtractSubFrame(
36       const std::vector<std::vector<float>>& block,
37       std::vector<rtc::ArrayView<float>>* sub_frame);
38 
39  private:
40   const size_t num_bands_;
41   std::vector<std::vector<float>> buffer_;
42 
43   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(BlockFramer);
44 };
45 }  // namespace webrtc
46 
47 #endif  // MODULES_AUDIO_PROCESSING_AEC3_BLOCK_FRAMER_H_
48