| 1 | /* |
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| 2 | Copyright 2018 Google Inc. All Rights Reserved. |
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| 3 | |
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| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
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| 5 | you may not use this file except in compliance with the License. |
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| 6 | You may obtain a copy of the License at |
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| 7 | |
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| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
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| 9 | |
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| 10 | Unless required by applicable law or agreed to in writing, software |
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| 11 | distributed under the License is distributed on an "AS-IS" BASIS, |
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| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 13 | See the License for the specific language governing permissions and |
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| 14 | limitations under the License. |
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| 15 | */ |
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| 16 | |
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| 17 | #include "base/audio_buffer.h" |
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| 18 | |
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| 19 | namespace vraudio { |
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| 20 | |
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| 21 | AudioBuffer::AudioBuffer() : num_frames_(0), source_id_(kInvalidSourceId) {} |
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| 22 | |
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| 23 | AudioBuffer::AudioBuffer(size_t num_channels, size_t num_frames) |
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| 24 | : num_frames_(num_frames), source_id_(kInvalidSourceId) { |
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| 25 | |
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| 26 | InitChannelViews(num_channels); |
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| 27 | } |
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| 28 | |
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| 29 | // Copy assignment from AudioBuffer. |
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| 30 | AudioBuffer& AudioBuffer::operator=(const AudioBuffer& other) { |
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| 31 | if (this != &other) { |
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| 32 | num_frames_ = other.num_frames_; |
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| 33 | source_id_ = other.source_id_; |
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| 34 | InitChannelViews(num_channels: other.num_channels()); |
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| 35 | for (size_t i = 0; i < num_channels(); ++i) { |
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| 36 | channel_views_[i] = other.channel_views_[i]; |
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| 37 | } |
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| 38 | } |
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| 39 | return *this; |
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| 40 | } |
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| 41 | |
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| 42 | AudioBuffer::AudioBuffer(AudioBuffer&& other) { |
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| 43 | num_frames_ = other.num_frames_; |
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| 44 | other.num_frames_ = 0; |
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| 45 | data_ = std::move(other.data_); |
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| 46 | data_size_ = other.data_size_; |
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| 47 | other.data_size_ = 0; |
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| 48 | channel_views_ = std::move(other.channel_views_); |
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| 49 | source_id_ = other.source_id_; |
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| 50 | other.source_id_ = kInvalidSourceId; |
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| 51 | } |
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| 52 | |
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| 53 | void AudioBuffer::InitChannelViews(size_t num_channels) { |
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| 54 | |
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| 55 | |
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| 56 | const size_t num_frames_to_next_channel = FindNextAlignedArrayIndex( |
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| 57 | length: num_frames_, type_size_bytes: sizeof(float), memory_alignment_bytes: kMemoryAlignmentBytes); |
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| 58 | |
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| 59 | data_size_ = num_channels * num_frames_to_next_channel; |
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| 60 | data_.resize(new_size: data_size_); |
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| 61 | |
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| 62 | channel_views_.clear(); |
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| 63 | channel_views_.reserve(n: num_channels); |
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| 64 | |
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| 65 | float* itr = data_.data(); |
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| 66 | |
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| 67 | for (size_t i = 0; i < num_channels; ++i) { |
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| 68 | ChannelView new_channel_view(itr, num_frames_); |
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| 69 | channel_views_.push_back(x: new_channel_view); |
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| 70 | itr += num_frames_to_next_channel; |
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| 71 | } |
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| 72 | } |
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| 73 | |
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| 74 | } // namespace vraudio |
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| 75 | |
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