| 1 | /* |
|---|---|
| 2 | Copyright 2018 Google Inc. All Rights Reserved. |
| 3 | |
| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | you may not use this file except in compliance with the License. |
| 6 | You may obtain a copy of the License at |
| 7 | |
| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | Unless required by applicable law or agreed to in writing, software |
| 11 | distributed under the License is distributed on an "AS-IS" BASIS, |
| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | See the License for the specific language governing permissions and |
| 14 | limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "graph/mono_from_soundfield_node.h" |
| 18 | |
| 19 | #include "base/constants_and_types.h" |
| 20 | |
| 21 | namespace vraudio { |
| 22 | |
| 23 | MonoFromSoundfieldNode::MonoFromSoundfieldNode( |
| 24 | SourceId source_id, const SystemSettings& system_settings) |
| 25 | : output_buffer_(kNumMonoChannels, system_settings.GetFramesPerBuffer()) { |
| 26 | output_buffer_.set_source_id(source_id); |
| 27 | output_buffer_.Clear(); |
| 28 | } |
| 29 | |
| 30 | const AudioBuffer* MonoFromSoundfieldNode::AudioProcess( |
| 31 | const NodeInput& input) { |
| 32 | |
| 33 | |
| 34 | const AudioBuffer* input_buffer = input.GetSingleInput(); |
| 35 | DCHECK(input_buffer); |
| 36 | DCHECK_EQ(input_buffer->source_id(), output_buffer_.source_id()); |
| 37 | DCHECK_NE(input_buffer->num_channels(), 0U); |
| 38 | DCHECK_EQ(input_buffer->num_frames(), output_buffer_.num_frames()); |
| 39 | // Get W channel of the ambisonic input. |
| 40 | output_buffer_[0] = (*input_buffer)[0]; |
| 41 | |
| 42 | return &output_buffer_; |
| 43 | } |
| 44 | |
| 45 | } // namespace vraudio |
| 46 |