Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 129 insertions, 0 deletions

diff --git a/third_party/libwebrtc/modules/audio_coding/neteq/comfort_noise.cc b/third_party/libwebrtc/modules/audio_coding/neteq/comfort_noise.cc
new file mode 100644
index 0000000000..8a906593d7
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_coding/neteq/comfort_noise.cc
@@ -0,0 +1,129 @@
+/*
+ *  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_coding/neteq/comfort_noise.h"
+
+#include <cstdint>
+#include <memory>
+
+#include "api/array_view.h"
+#include "modules/audio_coding/codecs/cng/webrtc_cng.h"
+#include "modules/audio_coding/neteq/audio_multi_vector.h"
+#include "modules/audio_coding/neteq/audio_vector.h"
+#include "modules/audio_coding/neteq/decoder_database.h"
+#include "modules/audio_coding/neteq/dsp_helper.h"
+#include "modules/audio_coding/neteq/sync_buffer.h"
+#include "rtc_base/buffer.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+void ComfortNoise::Reset() {
+  first_call_ = true;
+}
+
+int ComfortNoise::UpdateParameters(const Packet& packet) {
+  // Get comfort noise decoder.
+  if (decoder_database_->SetActiveCngDecoder(packet.payload_type) != kOK) {
+    return kUnknownPayloadType;
+  }
+  ComfortNoiseDecoder* cng_decoder = decoder_database_->GetActiveCngDecoder();
+  RTC_DCHECK(cng_decoder);
+  cng_decoder->UpdateSid(packet.payload);
+  return kOK;
+}
+
+int ComfortNoise::Generate(size_t requested_length, AudioMultiVector* output) {
+  // TODO(hlundin): Change to an enumerator and skip assert.
+  RTC_DCHECK(fs_hz_ == 8000 || fs_hz_ == 16000 || fs_hz_ == 32000 ||
+             fs_hz_ == 48000);
+  // Not adapted for multi-channel yet.
+  if (output->Channels() != 1) {
+    RTC_LOG(LS_ERROR) << "No multi-channel support";
+    return kMultiChannelNotSupported;
+  }
+
+  size_t number_of_samples = requested_length;
+  bool new_period = false;
+  if (first_call_) {
+    // Generate noise and overlap slightly with old data.
+    number_of_samples = requested_length + overlap_length_;
+    new_period = true;
+  }
+  output->AssertSize(number_of_samples);
+  // Get the decoder from the database.
+  ComfortNoiseDecoder* cng_decoder = decoder_database_->GetActiveCngDecoder();
+  if (!cng_decoder) {
+    RTC_LOG(LS_ERROR) << "Unknwown payload type";
+    return kUnknownPayloadType;
+  }
+
+  std::unique_ptr<int16_t[]> temp(new int16_t[number_of_samples]);
+  if (!cng_decoder->Generate(
+          rtc::ArrayView<int16_t>(temp.get(), number_of_samples), new_period)) {
+    // Error returned.
+    output->Zeros(requested_length);
+    RTC_LOG(LS_ERROR)
+        << "ComfortNoiseDecoder::Genererate failed to generate comfort noise";
+    return kInternalError;
+  }
+  (*output)[0].OverwriteAt(temp.get(), number_of_samples, 0);
+
+  if (first_call_) {
+    // Set tapering window parameters. Values are in Q15.
+    int16_t muting_window;              // Mixing factor for overlap data.
+    int16_t muting_window_increment;    // Mixing factor increment (negative).
+    int16_t unmuting_window;            // Mixing factor for comfort noise.
+    int16_t unmuting_window_increment;  // Mixing factor increment.
+    if (fs_hz_ == 8000) {
+      muting_window = DspHelper::kMuteFactorStart8kHz;
+      muting_window_increment = DspHelper::kMuteFactorIncrement8kHz;
+      unmuting_window = DspHelper::kUnmuteFactorStart8kHz;
+      unmuting_window_increment = DspHelper::kUnmuteFactorIncrement8kHz;
+    } else if (fs_hz_ == 16000) {
+      muting_window = DspHelper::kMuteFactorStart16kHz;
+      muting_window_increment = DspHelper::kMuteFactorIncrement16kHz;
+      unmuting_window = DspHelper::kUnmuteFactorStart16kHz;
+      unmuting_window_increment = DspHelper::kUnmuteFactorIncrement16kHz;
+    } else if (fs_hz_ == 32000) {
+      muting_window = DspHelper::kMuteFactorStart32kHz;
+      muting_window_increment = DspHelper::kMuteFactorIncrement32kHz;
+      unmuting_window = DspHelper::kUnmuteFactorStart32kHz;
+      unmuting_window_increment = DspHelper::kUnmuteFactorIncrement32kHz;
+    } else {  // fs_hz_ == 48000
+      muting_window = DspHelper::kMuteFactorStart48kHz;
+      muting_window_increment = DspHelper::kMuteFactorIncrement48kHz;
+      unmuting_window = DspHelper::kUnmuteFactorStart48kHz;
+      unmuting_window_increment = DspHelper::kUnmuteFactorIncrement48kHz;
+    }
+
+    // Do overlap-add between new vector and overlap.
+    size_t start_ix = sync_buffer_->Size() - overlap_length_;
+    for (size_t i = 0; i < overlap_length_; i++) {
+      /* overlapVec[i] = WinMute * overlapVec[i] + WinUnMute * outData[i] */
+      // The expression (*output)[0][i] is the i-th element in the first
+      // channel.
+      (*sync_buffer_)[0][start_ix + i] =
+          (((*sync_buffer_)[0][start_ix + i] * muting_window) +
+           ((*output)[0][i] * unmuting_window) + 16384) >>
+          15;
+      muting_window += muting_window_increment;
+      unmuting_window += unmuting_window_increment;
+    }
+    // Remove `overlap_length_` samples from the front of `output` since they
+    // were mixed into `sync_buffer_` above.
+    output->PopFront(overlap_length_);
+  }
+  first_call_ = false;
+  return kOK;
+}
+
+}  // namespace webrtc