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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/foa_rotator_node.h"
#include "base/logging.h"
namespace vraudio {
FoaRotatorNode::FoaRotatorNode(SourceId source_id,
const SystemSettings& system_settings)
: system_settings_(system_settings),
output_buffer_(kNumFirstOrderAmbisonicChannels,
system_settings.GetFramesPerBuffer()) {
output_buffer_.Clear();
output_buffer_.set_source_id(source_id);
}
const AudioBuffer* FoaRotatorNode::AudioProcess(const NodeInput& input) {
// Get the soundfield input buffer.
const AudioBuffer* input_buffer = input.GetSingleInput();
DCHECK(input_buffer);
DCHECK_GT(input_buffer->num_frames(), 0U);
DCHECK_EQ(input_buffer->num_channels(), 4U);
DCHECK_EQ(input_buffer->source_id(), output_buffer_.source_id());
// Rotate soundfield buffer by the inverse head orientation.
const auto source_parameters =
system_settings_.GetSourceParameters(input_buffer->source_id());
if (source_parameters == nullptr) {
LOG(WARNING) << "Could not find source parameters";
return nullptr;
}
const WorldRotation& source_rotation =
source_parameters->object_transform.rotation;
const WorldRotation inverse_head_rotation =
system_settings_.GetHeadRotation().conjugate();
const WorldRotation rotation = inverse_head_rotation * source_rotation;
const bool rotation_applied =
foa_rotator_.Process(rotation, *input_buffer, &output_buffer_);
if (!rotation_applied) {
return input_buffer;
}
// Copy buffer parameters.
return &output_buffer_;
}
} // namespace vraudio
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