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+/*
+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.
+*/
+
+#ifndef RESONANCE_AUDIO_BASE_SOURCE_PARAMETERS_H_
+#define RESONANCE_AUDIO_BASE_SOURCE_PARAMETERS_H_
+
+#include "api/resonance_audio_api.h"
+
+#include "base/constants_and_types.h"
+#include "base/object_transform.h"
+
+namespace vraudio {
+
+// Gain attenuation types for audio sources.
+enum AttenuationType {
+  kInput = 0,
+  kDirect,
+  kReflections,
+  kReverb,
+  kNumAttenuationTypes
+};
+
+// Parameters describing an audio source.
+struct SourceParameters {
+  // Object transform associated with this buffer.
+  ObjectTransform object_transform;
+
+  // Angular spread in degrees. Range [0, 360].
+  float spread_deg = 0.0f;
+
+  // Source gain factor.
+  float gain = 1.0f;
+
+  // Source gain attenuation factors to be calculated per each buffer.
+  float attenuations[kNumAttenuationTypes];
+
+  // Distance attenuation. Value 1 represents no attenuation should be applied,
+  // value 0 will fully attenuate the volume. Range [0, 1].
+  float distance_attenuation = 1.0f;
+
+  // Distance attenuation rolloff model to use.
+  DistanceRolloffModel distance_rolloff_model =
+      DistanceRolloffModel::kLogarithmic;
+
+  // Minimum distance at which to apply distance attenuation.
+  float minimum_distance = 0.0f;
+
+  // Maximum distance at which to apply distance attenuation.
+  float maximum_distance = 500.0f;
+
+  // Alpha weighting of source's directivity pattern. This sets the balance
+  // between the dipole and omnidirectional directivity patterns which combine
+  // to produce the single directivity output value. Range [0, 1], where 0 is
+  // fully omnidirectional and 1 is fully dipole.
+  float directivity_alpha = 0.0f;
+
+  // Source directivity order. Increasing this value increases the directivity
+  // towards the front of the source. Range [1, inf).
+  float directivity_order = 1.0f;
+
+  // Alpha weighting of listener's directivity pattern. This sets the balance
+  // between the dipole and omnidirectional pickup patterns which combine to
+  // produce the single output value. Range [0, 1], where 0 is fully
+  // omnidirectional and 1 is fully dipole.
+  float listener_directivity_alpha = 0.0f;
+
+  // Listener directivity order. Increasing this value increases the directivity
+  // towards the front of the listener. Range [1, inf).
+  float listener_directivity_order = 1.0f;
+
+  // Occlusion intensity. Value 0 represents no occlusion, values greater than 1
+  // represent multiple occlusions. The intensity of each occlusion is scaled
+  // in range [0, 1].
+  float occlusion_intensity = 0.0f;
+
+  // Near field effect gain. Range [0, 9].
+  float near_field_gain = 0.0f;
+
+  // Source gain factor for the room effects.
+  float room_effects_gain = 1.0f;
+
+  // Whether the source uses binaural rendering or stereo panning.
+  bool enable_hrtf = true;
+};
+
+}  // namespace vraudio
+
+#endif  // RESONANCE_AUDIO_BASE_SOURCE_PARAMETERS_H_