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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.
*/
#include "graph/stereo_mixing_panner_node.h"
#include "base/constants_and_types.h"
#include "base/logging.h"
#include "base/spherical_angle.h"
#include "dsp/stereo_panner.h"
namespace vraudio {
StereoMixingPannerNode::StereoMixingPannerNode(
const SystemSettings& system_settings)
: system_settings_(system_settings),
gain_mixer_(kNumStereoChannels, system_settings_.GetFramesPerBuffer()),
coefficients_(kNumStereoChannels) {}
const AudioBuffer* StereoMixingPannerNode::AudioProcess(
const NodeInput& input) {
const WorldPosition& listener_position = system_settings_.GetHeadPosition();
const WorldRotation& listener_rotation = system_settings_.GetHeadRotation();
gain_mixer_.Reset();
for (auto& input_buffer : input.GetInputBuffers()) {
const int source_id = input_buffer->source_id();
const auto source_parameters =
system_settings_.GetSourceParameters(source_id);
DCHECK_NE(source_id, kInvalidSourceId);
DCHECK_EQ(input_buffer->num_channels(), 1U);
// Compute the relative source direction in spherical angles.
const ObjectTransform& source_transform =
source_parameters->object_transform;
WorldPosition relative_direction;
GetRelativeDirection(listener_position, listener_rotation,
source_transform.position, &relative_direction);
const SphericalAngle source_direction =
SphericalAngle::FromWorldPosition(relative_direction);
CalculateStereoPanGains(source_direction, &coefficients_);
gain_mixer_.AddInputChannel((*input_buffer)[0], source_id, coefficients_);
}
return gain_mixer_.GetOutput();
}
} // namespace vraudio
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