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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_AEC3_COMMON_H_
#define MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_
#include <stddef.h>
#include "typedefs.h" // NOLINT(build/include)
namespace webrtc {
#ifdef _MSC_VER /* visual c++ */
#define ALIGN16_BEG __declspec(align(16))
#define ALIGN16_END
#else /* gcc or icc */
#define ALIGN16_BEG
#define ALIGN16_END __attribute__((aligned(16)))
#endif
enum class Aec3Optimization { kNone, kSse2, kNeon };
constexpr int kNumBlocksPerSecond = 250;
constexpr int kMetricsReportingIntervalBlocks = 10 * kNumBlocksPerSecond;
constexpr int kMetricsComputationBlocks = 9;
constexpr int kMetricsCollectionBlocks =
kMetricsReportingIntervalBlocks - kMetricsComputationBlocks;
constexpr size_t kFftLengthBy2 = 64;
constexpr size_t kFftLengthBy2Plus1 = kFftLengthBy2 + 1;
constexpr size_t kFftLengthBy2Minus1 = kFftLengthBy2 - 1;
constexpr size_t kFftLength = 2 * kFftLengthBy2;
constexpr int kAdaptiveFilterLength = 12;
constexpr int kUnknownDelayRenderWindowSize = 30;
constexpr int kAdaptiveFilterTimeDomainLength =
kAdaptiveFilterLength * kFftLengthBy2;
constexpr size_t kMaxNumBands = 3;
constexpr size_t kSubFrameLength = 80;
constexpr size_t kBlockSize = kFftLengthBy2;
constexpr size_t kExtendedBlockSize = 2 * kFftLengthBy2;
constexpr size_t kSubBlockSize = 16;
constexpr size_t kNumMatchedFilters = 4;
constexpr size_t kMatchedFilterWindowSizeSubBlocks = 32;
constexpr size_t kMatchedFilterAlignmentShiftSizeSubBlocks =
kMatchedFilterWindowSizeSubBlocks * 3 / 4;
constexpr size_t kDownsampledRenderBufferSize =
kSubBlockSize *
(kMatchedFilterAlignmentShiftSizeSubBlocks * kNumMatchedFilters +
kMatchedFilterWindowSizeSubBlocks +
1);
constexpr size_t kRenderDelayBufferSize =
(3 * kDownsampledRenderBufferSize) / (4 * kSubBlockSize);
constexpr size_t kMinEchoPathDelayBlocks = 5;
constexpr size_t kMaxApiCallsJitterBlocks = 26;
constexpr size_t kRenderTransferQueueSize = kMaxApiCallsJitterBlocks / 2;
static_assert(2 * kRenderTransferQueueSize >= kMaxApiCallsJitterBlocks,
"Requirement to ensure buffer overflow detection");
constexpr size_t kEchoPathChangeConvergenceBlocks = 2 * kNumBlocksPerSecond;
// TODO(peah): Integrate this with how it is done inside audio_processing_impl.
constexpr size_t NumBandsForRate(int sample_rate_hz) {
return static_cast<size_t>(sample_rate_hz == 8000 ? 1
: sample_rate_hz / 16000);
}
constexpr int LowestBandRate(int sample_rate_hz) {
return sample_rate_hz == 8000 ? sample_rate_hz : 16000;
}
constexpr bool ValidFullBandRate(int sample_rate_hz) {
return sample_rate_hz == 8000 || sample_rate_hz == 16000 ||
sample_rate_hz == 32000 || sample_rate_hz == 48000;
}
// Detects what kind of optimizations to use for the code.
Aec3Optimization DetectOptimization();
static_assert(1 == NumBandsForRate(8000), "Number of bands for 8 kHz");
static_assert(1 == NumBandsForRate(16000), "Number of bands for 16 kHz");
static_assert(2 == NumBandsForRate(32000), "Number of bands for 32 kHz");
static_assert(3 == NumBandsForRate(48000), "Number of bands for 48 kHz");
static_assert(8000 == LowestBandRate(8000), "Sample rate of band 0 for 8 kHz");
static_assert(16000 == LowestBandRate(16000),
"Sample rate of band 0 for 16 kHz");
static_assert(16000 == LowestBandRate(32000),
"Sample rate of band 0 for 32 kHz");
static_assert(16000 == LowestBandRate(48000),
"Sample rate of band 0 for 48 kHz");
static_assert(ValidFullBandRate(8000),
"Test that 8 kHz is a valid sample rate");
static_assert(ValidFullBandRate(16000),
"Test that 16 kHz is a valid sample rate");
static_assert(ValidFullBandRate(32000),
"Test that 32 kHz is a valid sample rate");
static_assert(ValidFullBandRate(48000),
"Test that 48 kHz is a valid sample rate");
static_assert(!ValidFullBandRate(8001),
"Test that 8001 Hz is not a valid sample rate");
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_AEC3_COMMON_H_
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