Reland "Refactoring of the noise suppressor and adding true multichannel support"
This is a reland of 87a7b82520b83a6cf42da27cdc46142c2eb6248c
Original change's description:
> Refactoring of the noise suppressor and adding true multichannel support
>
> This CL adds proper multichannel support to the noise suppressor.
> To accomplish that in a safe way, a full refactoring of the noise
> suppressor code has been done.
>
> Due to floating point precision, the changes made are not entirely
> bitexact. They are, however, very close to being bitexact.
>
> As a safety measure, the former noise suppressor code is preserved
> and a kill-switch is added to allow revering to the legacy noise
> suppressor in case issues arise.
>
> Bug: webrtc:10895, b/143344262
> Change-Id: I0b071011b23265ac12e6d4b3956499d122286657
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158407
> Commit-Queue: Per Åhgren <peah@webrtc.org>
> Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#29646}
Bug: webrtc:10895, b/143344262
Change-Id: I236f1e67bb0baa4e30908a4cf7a8a7bb55fbced3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158747
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Commit-Queue: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29663}
diff --git a/modules/audio_processing/ns/suppression_params.cc b/modules/audio_processing/ns/suppression_params.cc
new file mode 100644
index 0000000..9a6bd5a
--- /dev/null
+++ b/modules/audio_processing/ns/suppression_params.cc
@@ -0,0 +1,49 @@
+/*
+ * 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.
+ */
+
+#include "modules/audio_processing/ns/suppression_params.h"
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+SuppressionParams::SuppressionParams(
+ NsConfig::SuppressionLevel suppression_level) {
+ switch (suppression_level) {
+ case NsConfig::SuppressionLevel::k6dB:
+ over_subtraction_factor = 1.f;
+ // 6 dB attenuation.
+ minimum_attenuating_gain = 0.5f;
+ use_attenuation_adjustment = false;
+ break;
+ case NsConfig::SuppressionLevel::k12dB:
+ over_subtraction_factor = 1.f;
+ // 12 dB attenuation.
+ minimum_attenuating_gain = 0.25f;
+ use_attenuation_adjustment = true;
+ break;
+ case NsConfig::SuppressionLevel::k18dB:
+ over_subtraction_factor = 1.1f;
+ // 18 dB attenuation.
+ minimum_attenuating_gain = 0.125f;
+ use_attenuation_adjustment = true;
+ break;
+ case NsConfig::SuppressionLevel::k21dB:
+ over_subtraction_factor = 1.25f;
+ // 20.9 dB attenuation.
+ minimum_attenuating_gain = 0.09f;
+ use_attenuation_adjustment = true;
+ break;
+ default:
+ RTC_NOTREACHED();
+ }
+}
+
+} // namespace webrtc