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1b4059e84f
This CL changes the AEC3 behavior to be more transparent when there is uncertainty about the amount of echo in the microphone signal. Bug: webrtc:8398, chromium:774868 Change-Id: I88e681f8decd892f44397b753df371a1c4b90af0 Reviewed-on: https://webrtc-review.googlesource.com/10801 Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Commit-Queue: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20319}
117 lines
4.4 KiB
C++
117 lines
4.4 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_
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#include <stddef.h>
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#include "typedefs.h" // NOLINT(build/include)
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namespace webrtc {
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#ifdef _MSC_VER /* visual c++ */
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#define ALIGN16_BEG __declspec(align(16))
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#define ALIGN16_END
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#else /* gcc or icc */
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#define ALIGN16_BEG
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#define ALIGN16_END __attribute__((aligned(16)))
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#endif
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enum class Aec3Optimization { kNone, kSse2, kNeon };
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constexpr int kNumBlocksPerSecond = 250;
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constexpr int kMetricsReportingIntervalBlocks = 10 * kNumBlocksPerSecond;
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constexpr int kMetricsComputationBlocks = 9;
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constexpr int kMetricsCollectionBlocks =
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kMetricsReportingIntervalBlocks - kMetricsComputationBlocks;
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constexpr size_t kFftLengthBy2 = 64;
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constexpr size_t kFftLengthBy2Plus1 = kFftLengthBy2 + 1;
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constexpr size_t kFftLengthBy2Minus1 = kFftLengthBy2 - 1;
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constexpr size_t kFftLength = 2 * kFftLengthBy2;
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constexpr int kAdaptiveFilterLength = 12;
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constexpr int kUnknownDelayRenderWindowSize = 30;
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constexpr int kAdaptiveFilterTimeDomainLength =
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kAdaptiveFilterLength * kFftLengthBy2;
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constexpr size_t kMaxNumBands = 3;
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constexpr size_t kSubFrameLength = 80;
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constexpr size_t kBlockSize = kFftLengthBy2;
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constexpr size_t kExtendedBlockSize = 2 * kFftLengthBy2;
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constexpr size_t kSubBlockSize = 16;
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constexpr size_t kNumMatchedFilters = 4;
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constexpr size_t kMatchedFilterWindowSizeSubBlocks = 32;
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constexpr size_t kMatchedFilterAlignmentShiftSizeSubBlocks =
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kMatchedFilterWindowSizeSubBlocks * 3 / 4;
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constexpr size_t kDownsampledRenderBufferSize =
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kSubBlockSize *
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(kMatchedFilterAlignmentShiftSizeSubBlocks * kNumMatchedFilters +
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kMatchedFilterWindowSizeSubBlocks +
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1);
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constexpr size_t kRenderDelayBufferSize =
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(3 * kDownsampledRenderBufferSize) / (4 * kSubBlockSize);
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constexpr size_t kMinEchoPathDelayBlocks = 5;
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constexpr size_t kMaxApiCallsJitterBlocks = 26;
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constexpr size_t kRenderTransferQueueSize = kMaxApiCallsJitterBlocks / 2;
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static_assert(2 * kRenderTransferQueueSize >= kMaxApiCallsJitterBlocks,
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"Requirement to ensure buffer overflow detection");
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constexpr size_t kEchoPathChangeConvergenceBlocks = 2 * kNumBlocksPerSecond;
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// TODO(peah): Integrate this with how it is done inside audio_processing_impl.
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constexpr size_t NumBandsForRate(int sample_rate_hz) {
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return static_cast<size_t>(sample_rate_hz == 8000 ? 1
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: sample_rate_hz / 16000);
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}
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constexpr int LowestBandRate(int sample_rate_hz) {
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return sample_rate_hz == 8000 ? sample_rate_hz : 16000;
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}
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constexpr bool ValidFullBandRate(int sample_rate_hz) {
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return sample_rate_hz == 8000 || sample_rate_hz == 16000 ||
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sample_rate_hz == 32000 || sample_rate_hz == 48000;
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}
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// Detects what kind of optimizations to use for the code.
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Aec3Optimization DetectOptimization();
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static_assert(1 == NumBandsForRate(8000), "Number of bands for 8 kHz");
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static_assert(1 == NumBandsForRate(16000), "Number of bands for 16 kHz");
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static_assert(2 == NumBandsForRate(32000), "Number of bands for 32 kHz");
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static_assert(3 == NumBandsForRate(48000), "Number of bands for 48 kHz");
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static_assert(8000 == LowestBandRate(8000), "Sample rate of band 0 for 8 kHz");
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static_assert(16000 == LowestBandRate(16000),
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"Sample rate of band 0 for 16 kHz");
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static_assert(16000 == LowestBandRate(32000),
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"Sample rate of band 0 for 32 kHz");
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static_assert(16000 == LowestBandRate(48000),
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"Sample rate of band 0 for 48 kHz");
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static_assert(ValidFullBandRate(8000),
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"Test that 8 kHz is a valid sample rate");
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static_assert(ValidFullBandRate(16000),
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"Test that 16 kHz is a valid sample rate");
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static_assert(ValidFullBandRate(32000),
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"Test that 32 kHz is a valid sample rate");
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static_assert(ValidFullBandRate(48000),
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"Test that 48 kHz is a valid sample rate");
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static_assert(!ValidFullBandRate(8001),
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"Test that 8001 Hz is not a valid sample rate");
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_
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