mono_from_soundfield_node.cc

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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/mono_from_soundfield_node.h"

#include "base/constants_and_types.h"

namespace vraudio {

MonoFromSoundfieldNode::MonoFromSoundfieldNode(

    SourceId source_id, const SystemSettings& system_settings)

    : output_buffer_(kNumMonoChannels, system_settings.GetFramesPerBuffer()) {

  output_buffer_.set_source_id(source_id);

  output_buffer_.Clear();

const AudioBuffer* MonoFromSoundfieldNode::AudioProcess(

    const NodeInput& input) {

  const AudioBuffer* input_buffer = input.GetSingleInput();

  DCHECK(input_buffer);

  DCHECK_EQ(input_buffer->source_id(), output_buffer_.source_id());

  DCHECK_NE(input_buffer->num_channels(), 0U);

  DCHECK_EQ(input_buffer->num_frames(), output_buffer_.num_frames());

  // Get W channel of the ambisonic input.

  output_buffer_[0] = (*input_buffer)[0];

  return &output_buffer_;

}  // namespace vraudio