1 files changed, 54 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_erl.h b/third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_erl.h
new file mode 100644
index 0000000000..4ac13b1bc3
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_processing/aec3/adaptive_fir_filter_erl.h
@@ -0,0 +1,54 @@
+/*
+ *  Copyright (c) 2019 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_ADAPTIVE_FIR_FILTER_ERL_H_
+#define MODULES_AUDIO_PROCESSING_AEC3_ADAPTIVE_FIR_FILTER_ERL_H_
+
+#include <stddef.h>
+
+#include <array>
+#include <vector>
+
+#include "api/array_view.h"
+#include "modules/audio_processing/aec3/aec3_common.h"
+#include "rtc_base/system/arch.h"
+
+namespace webrtc {
+namespace aec3 {
+
+// Computes and stores the echo return loss estimate of the filter, which is the
+// sum of the partition frequency responses.
+void ErlComputer(const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
+                 rtc::ArrayView<float> erl);
+#if defined(WEBRTC_HAS_NEON)
+void ErlComputer_NEON(
+    const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
+    rtc::ArrayView<float> erl);
+#endif
+#if defined(WEBRTC_ARCH_X86_FAMILY)
+void ErlComputer_SSE2(
+    const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
+    rtc::ArrayView<float> erl);
+
+void ErlComputer_AVX2(
+    const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
+    rtc::ArrayView<float> erl);
+#endif
+
+}  // namespace aec3
+
+// Computes the echo return loss based on a frequency response.
+void ComputeErl(const Aec3Optimization& optimization,
+                const std::vector<std::array<float, kFftLengthBy2Plus1>>& H2,
+                rtc::ArrayView<float> erl);
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_AEC3_ADAPTIVE_FIR_FILTER_ERL_H_