Line data    Source code

       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 WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_
      12             : #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_
      13             : 
      14             : #include <stddef.h>
      15             : 
      16             : namespace webrtc {
      17             : 
      18             : constexpr size_t kFftLengthBy2 = 64;
      19             : constexpr size_t kFftLengthBy2Plus1 = kFftLengthBy2 + 1;
      20             : constexpr size_t kFftLength = 2 * kFftLengthBy2;
      21             : 
      22             : constexpr size_t kMaxNumBands = 3;
      23             : constexpr size_t kSubFrameLength = 80;
      24             : 
      25             : constexpr size_t kBlockSize = kFftLengthBy2;
      26             : constexpr size_t kExtendedBlockSize = 2 * kFftLengthBy2;
      27             : constexpr size_t kSubBlockSize = 16;
      28             : 
      29           0 : constexpr size_t NumBandsForRate(int sample_rate_hz) {
      30           0 :   return static_cast<size_t>(sample_rate_hz == 8000 ? 1
      31           0 :                                                     : sample_rate_hz / 16000);
      32             : }
      33           0 : constexpr int LowestBandRate(int sample_rate_hz) {
      34           0 :   return sample_rate_hz == 8000 ? sample_rate_hz : 16000;
      35             : }
      36             : 
      37             : static_assert(1 == NumBandsForRate(8000), "Number of bands for 8 kHz");
      38             : static_assert(1 == NumBandsForRate(16000), "Number of bands for 16 kHz");
      39             : static_assert(2 == NumBandsForRate(32000), "Number of bands for 32 kHz");
      40             : static_assert(3 == NumBandsForRate(48000), "Number of bands for 48 kHz");
      41             : 
      42             : static_assert(8000 == LowestBandRate(8000), "Sample rate of band 0 for 8 kHz");
      43             : static_assert(16000 == LowestBandRate(16000),
      44             :               "Sample rate of band 0 for 16 kHz");
      45             : static_assert(16000 == LowestBandRate(32000),
      46             :               "Sample rate of band 0 for 32 kHz");
      47             : static_assert(16000 == LowestBandRate(48000),
      48             :               "Sample rate of band 0 for 48 kHz");
      49             : 
      50             : }  // namespace webrtc
      51             : 
      52             : #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_AEC3_CONSTANTS_H_