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_FRAME_BLOCKER_H_
12 #define MODULES_AUDIO_PROCESSING_AEC3_FRAME_BLOCKER_H_
13 
14 #include <stddef.h>
15 #include <vector>
16 
17 #include "api/array_view.h"
18 #include "modules/audio_processing/aec3/aec3_common.h"
19 #include "rtc_base/constructormagic.h"
20 
21 namespace webrtc {
22 
23 // Class for producing 64 sample multiband blocks from frames consisting of 1 or
24 // 2 subframes of 80 samples.
25 class FrameBlocker {
26  public:
27   explicit FrameBlocker(size_t num_bands);
28   ~FrameBlocker();
29   // Inserts one 80 sample multiband subframe from the multiband frame and
30   // extracts one 64 sample multiband block.
31   void InsertSubFrameAndExtractBlock(
32       const std::vector<rtc::ArrayView<float>>& sub_frame,
33       std::vector<std::vector<float>>* block);
34   // Reports whether a multiband block of 64 samples is available for
35   // extraction.
36   bool IsBlockAvailable() const;
37   // Extracts a multiband block of 64 samples.
38   void ExtractBlock(std::vector<std::vector<float>>* block);
39 
40  private:
41   const size_t num_bands_;
42   std::vector<std::vector<float>> buffer_;
43 
44   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FrameBlocker);
45 };
46 }  // namespace webrtc
47 
48 #endif  // MODULES_AUDIO_PROCESSING_AEC3_FRAME_BLOCKER_H_
49