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ece6a51e5b
Add voice transcoding during phone call with two basic transforms: - sample rate downscaling by a factor of 2 with a decimator - sample rate upscaling by a factor of 2 with an interpolator (no low-pass filter) Signed-off-by: Marcin Smoczyński <smoczynski.marcin@gmail.com>
42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
// Copyright (c) 2017-2021, Mudita Sp. z.o.o. All rights reserved.
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// For licensing, see https://github.com/mudita/MuditaOS/LICENSE.md
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#include "MonoToStereo.hpp"
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#include <Audio/AudioFormat.hpp>
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using audio::transcode::MonoToStereo;
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auto MonoToStereo::transform(const Span &span, const Span &transformSpace) const -> Span
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{
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auto outputSpan = Span{.data = transformSpace.data, .dataSize = transformBlockSize(span.dataSize)};
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auto outputBuffer = reinterpret_cast<std::uint16_t *>(transformSpace.data);
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auto inputBuffer = reinterpret_cast<std::uint16_t *>(span.data);
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for (std::size_t i = span.dataSize / sizeof(std::uint16_t); i > 0; i--) {
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outputBuffer[i * 2 - 1] = outputBuffer[i * 2 - 2] = inputBuffer[i - 1];
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}
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return outputSpan;
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}
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auto MonoToStereo::transformBlockSize(std::size_t inputBufferSize) const noexcept -> std::size_t
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{
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return 2 * inputBufferSize;
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}
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auto MonoToStereo::transformBlockSizeInverted(std::size_t outputBufferSize) const noexcept -> std::size_t
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{
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return outputBufferSize / 2;
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}
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auto MonoToStereo::validateInputFormat(const audio::AudioFormat &inputFormat) const noexcept -> bool
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{
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return inputFormat.getChannels() == 1;
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}
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auto MonoToStereo::transformFormat(const audio::AudioFormat &inputFormat) const noexcept -> audio::AudioFormat
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{
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return audio::AudioFormat(inputFormat.getSampleRate(), inputFormat.getBitWidth(), 2);
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}
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