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/legacy_ns/noise_suppression.c b/modules/audio_processing/legacy_ns/noise_suppression.c
new file mode 100644
index 0000000..8b95640
--- /dev/null
+++ b/modules/audio_processing/legacy_ns/noise_suppression.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2012 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/legacy_ns/noise_suppression.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+#include "modules/audio_processing/legacy_ns/defines.h"
+#include "modules/audio_processing/legacy_ns/ns_core.h"
+
+NsHandle* WebRtcNs_Create() {
+ NoiseSuppressionC* self = malloc(sizeof(NoiseSuppressionC));
+ self->initFlag = 0;
+ return (NsHandle*)self;
+}
+
+void WebRtcNs_Free(NsHandle* NS_inst) {
+ free(NS_inst);
+}
+
+int WebRtcNs_Init(NsHandle* NS_inst, uint32_t fs) {
+ return WebRtcNs_InitCore((NoiseSuppressionC*)NS_inst, fs);
+}
+
+int WebRtcNs_set_policy(NsHandle* NS_inst, int mode) {
+ return WebRtcNs_set_policy_core((NoiseSuppressionC*)NS_inst, mode);
+}
+
+void WebRtcNs_Analyze(NsHandle* NS_inst, const float* spframe) {
+ WebRtcNs_AnalyzeCore((NoiseSuppressionC*)NS_inst, spframe);
+}
+
+void WebRtcNs_Process(NsHandle* NS_inst,
+ const float* const* spframe,
+ size_t num_bands,
+ float* const* outframe) {
+ WebRtcNs_ProcessCore((NoiseSuppressionC*)NS_inst, spframe, num_bands,
+ outframe);
+}
+
+float WebRtcNs_prior_speech_probability(NsHandle* handle) {
+ NoiseSuppressionC* self = (NoiseSuppressionC*)handle;
+ if (handle == NULL) {
+ return -1;
+ }
+ if (self->initFlag == 0) {
+ return -1;
+ }
+ return self->priorSpeechProb;
+}
+
+const float* WebRtcNs_noise_estimate(const NsHandle* handle) {
+ const NoiseSuppressionC* self = (const NoiseSuppressionC*)handle;
+ if (handle == NULL || self->initFlag == 0) {
+ return NULL;
+ }
+ return self->noise;
+}
+
+size_t WebRtcNs_num_freq() {
+ return HALF_ANAL_BLOCKL;
+}