1 files changed, 113 insertions, 0 deletions
diff --git a/src/3rdparty/resonance-audio/resonance_audio/graph/reflections_node.cc b/src/3rdparty/resonance-audio/resonance_audio/graph/reflections_node.cc
new file mode 100644
index 000000000..1223fe7e8
--- /dev/null
+++ b/src/3rdparty/resonance-audio/resonance_audio/graph/reflections_node.cc
@@ -0,0 +1,113 @@
+/*
+Copyright 2018 Google Inc. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS-IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "graph/reflections_node.h"
+
+#include "base/constants_and_types.h"
+#include "base/logging.h"
+#include "base/misc_math.h"
+
+
+namespace vraudio {
+
+ReflectionsNode::ReflectionsNode(const SystemSettings& system_settings)
+    : system_settings_(system_settings),
+      reflections_processor_(system_settings_.GetSampleRateHz(),
+                             system_settings_.GetFramesPerBuffer()),
+      num_frames_processed_on_empty_input_(
+          system_settings_.GetFramesPerBuffer()),
+      output_buffer_(kNumFirstOrderAmbisonicChannels,
+                     system_settings_.GetFramesPerBuffer()),
+      silence_mono_buffer_(kNumMonoChannels,
+                           system_settings_.GetFramesPerBuffer()) {
+  silence_mono_buffer_.Clear();
+  EnableProcessOnEmptyInput(true);
+}
+
+void ReflectionsNode::Update() {
+
+  const auto& current_reflection_properties = reflection_properties_;
+  const auto& new_reflection_properties =
+      system_settings_.GetReflectionProperties();
+  const bool room_position_changed =
+      !EqualSafe(std::begin(current_reflection_properties.room_position),
+                 std::end(current_reflection_properties.room_position),
+                 std::begin(new_reflection_properties.room_position),
+                 std::end(new_reflection_properties.room_position));
+  const bool room_rotation_changed =
+      !EqualSafe(std::begin(current_reflection_properties.room_rotation),
+                 std::end(current_reflection_properties.room_rotation),
+                 std::begin(new_reflection_properties.room_rotation),
+                 std::end(new_reflection_properties.room_rotation));
+  const bool room_dimensions_changed =
+      !EqualSafe(std::begin(current_reflection_properties.room_dimensions),
+                 std::end(current_reflection_properties.room_dimensions),
+                 std::begin(new_reflection_properties.room_dimensions),
+                 std::end(new_reflection_properties.room_dimensions));
+  const bool cutoff_frequency_changed =
+      current_reflection_properties.cutoff_frequency !=
+      new_reflection_properties.cutoff_frequency;
+  const bool coefficients_changed =
+      !EqualSafe(std::begin(current_reflection_properties.coefficients),
+                 std::end(current_reflection_properties.coefficients),
+                 std::begin(new_reflection_properties.coefficients),
+                 std::end(new_reflection_properties.coefficients));
+  const auto& current_listener_position = listener_position_;
+  const auto& new_listener_position = system_settings_.GetHeadPosition();
+  const bool listener_position_changed =
+      current_listener_position != new_listener_position;
+  if (room_position_changed || room_rotation_changed ||
+      room_dimensions_changed || cutoff_frequency_changed ||
+      coefficients_changed || listener_position_changed) {
+    // Update reflections processor if necessary.
+    reflection_properties_ = new_reflection_properties;
+    listener_position_ = new_listener_position;
+    reflections_processor_.Update(reflection_properties_, listener_position_);
+  }
+}
+
+const AudioBuffer* ReflectionsNode::AudioProcess(const NodeInput& input) {
+
+  const AudioBuffer* input_buffer = input.GetSingleInput();
+  const size_t num_frames = system_settings_.GetFramesPerBuffer();
+  if (input_buffer == nullptr) {
+    // If we have no input, generate a silent input buffer until the node states
+    // are cleared.
+    if (num_frames_processed_on_empty_input_ <
+        reflections_processor_.num_frames_to_process_on_empty_input()) {
+      num_frames_processed_on_empty_input_ += num_frames;
+      input_buffer = &silence_mono_buffer_;
+    } else {
+      // Skip processing entirely when the states are fully cleared.
+      return nullptr;
+    }
+  } else {
+    num_frames_processed_on_empty_input_ = 0;
+    DCHECK_EQ(input_buffer->num_channels(), kNumMonoChannels);
+  }
+  output_buffer_.Clear();
+  reflections_processor_.Process(*input_buffer, &output_buffer_);
+
+  // Rotate the reflections with respect to listener's orientation.
+  const WorldRotation inverse_head_rotation =
+      system_settings_.GetHeadRotation().conjugate();
+  foa_rotator_.Process(inverse_head_rotation, output_buffer_, &output_buffer_);
+
+  // Copy buffer parameters.
+  return &output_buffer_;
+}
+
+}  // namespace vraudio