diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /third_party/libwebrtc/audio/utility/channel_mixing_matrix.h | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/libwebrtc/audio/utility/channel_mixing_matrix.h')
-rw-r--r-- | third_party/libwebrtc/audio/utility/channel_mixing_matrix.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/third_party/libwebrtc/audio/utility/channel_mixing_matrix.h b/third_party/libwebrtc/audio/utility/channel_mixing_matrix.h new file mode 100644 index 0000000000..ee00860846 --- /dev/null +++ b/third_party/libwebrtc/audio/utility/channel_mixing_matrix.h @@ -0,0 +1,76 @@ +/* + * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef AUDIO_UTILITY_CHANNEL_MIXING_MATRIX_H_ +#define AUDIO_UTILITY_CHANNEL_MIXING_MATRIX_H_ + +#include <vector> + +#include "api/audio/channel_layout.h" + +namespace webrtc { + +class ChannelMixingMatrix { + public: + ChannelMixingMatrix(ChannelLayout input_layout, + int input_channels, + ChannelLayout output_layout, + int output_channels); + + ~ChannelMixingMatrix(); + + // Create the transformation matrix of input channels to output channels. + // Updates the empty matrix with the transformation, and returns true + // if the transformation is just a remapping of channels (no mixing). + // The size of `matrix` is `output_channels` x `input_channels`, i.e., the + // number of rows equals the number of output channels and the number of + // columns corresponds to the number of input channels. + // This file is derived from Chromium's media/base/channel_mixing_matrix.h. + bool CreateTransformationMatrix(std::vector<std::vector<float>>* matrix); + + private: + const bool use_voip_channel_mapping_adjustments_; + + // Result transformation of input channels to output channels + std::vector<std::vector<float>>* matrix_; + + // Input and output channel layout provided during construction. + ChannelLayout input_layout_; + int input_channels_; + ChannelLayout output_layout_; + int output_channels_; + + // Helper variable for tracking which inputs are currently unaccounted, + // should be empty after construction completes. + std::vector<Channels> unaccounted_inputs_; + + // Helper methods for managing unaccounted input channels. + void AccountFor(Channels ch); + bool IsUnaccounted(Channels ch) const; + + // Helper methods for checking if `ch` exists in either `input_layout_` or + // `output_layout_` respectively. + bool HasInputChannel(Channels ch) const; + bool HasOutputChannel(Channels ch) const; + + // Helper methods for updating `matrix_` with the proper value for + // mixing `input_ch` into `output_ch`. MixWithoutAccounting() does not + // remove the channel from `unaccounted_inputs_`. + void Mix(Channels input_ch, Channels output_ch, float scale); + void MixWithoutAccounting(Channels input_ch, Channels output_ch, float scale); + + // Delete the copy constructor and assignment operator. + ChannelMixingMatrix(const ChannelMixingMatrix& other) = delete; + ChannelMixingMatrix& operator=(const ChannelMixingMatrix& other) = delete; +}; + +} // namespace webrtc + +#endif // AUDIO_UTILITY_CHANNEL_MIXING_MATRIX_H_ |