Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/third_party/libwebrtc/modules/audio_processing/splitting_filter.h b/third_party/libwebrtc/modules/audio_processing/splitting_filter.h
new file mode 100644
index 0000000000..e578dd07c1
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_processing/splitting_filter.h
@@ -0,0 +1,72 @@
+/*
+ *  Copyright (c) 2014 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_SPLITTING_FILTER_H_
+#define MODULES_AUDIO_PROCESSING_SPLITTING_FILTER_H_
+
+#include <cstring>
+#include <memory>
+#include <vector>
+
+#include "common_audio/channel_buffer.h"
+#include "modules/audio_processing/three_band_filter_bank.h"
+
+namespace webrtc {
+
+struct TwoBandsStates {
+  TwoBandsStates() {
+    memset(analysis_state1, 0, sizeof(analysis_state1));
+    memset(analysis_state2, 0, sizeof(analysis_state2));
+    memset(synthesis_state1, 0, sizeof(synthesis_state1));
+    memset(synthesis_state2, 0, sizeof(synthesis_state2));
+  }
+
+  static const int kStateSize = 6;
+  int analysis_state1[kStateSize];
+  int analysis_state2[kStateSize];
+  int synthesis_state1[kStateSize];
+  int synthesis_state2[kStateSize];
+};
+
+// Splitting filter which is able to split into and merge from 2 or 3 frequency
+// bands. The number of channels needs to be provided at construction time.
+//
+// For each block, Analysis() is called to split into bands and then Synthesis()
+// to merge these bands again. The input and output signals are contained in
+// ChannelBuffers and for the different bands an array of ChannelBuffers is
+// used.
+class SplittingFilter {
+ public:
+  SplittingFilter(size_t num_channels, size_t num_bands, size_t num_frames);
+  ~SplittingFilter();
+
+  void Analysis(const ChannelBuffer<float>* data, ChannelBuffer<float>* bands);
+  void Synthesis(const ChannelBuffer<float>* bands, ChannelBuffer<float>* data);
+
+ private:
+  // Two-band analysis and synthesis work for 640 samples or less.
+  void TwoBandsAnalysis(const ChannelBuffer<float>* data,
+                        ChannelBuffer<float>* bands);
+  void TwoBandsSynthesis(const ChannelBuffer<float>* bands,
+                         ChannelBuffer<float>* data);
+  void ThreeBandsAnalysis(const ChannelBuffer<float>* data,
+                          ChannelBuffer<float>* bands);
+  void ThreeBandsSynthesis(const ChannelBuffer<float>* bands,
+                           ChannelBuffer<float>* data);
+  void InitBuffers();
+
+  const size_t num_bands_;
+  std::vector<TwoBandsStates> two_bands_states_;
+  std::vector<ThreeBandFilterBank> three_band_filter_banks_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_SPLITTING_FILTER_H_