86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/*
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* Copyright (C) 2026 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "audio/MusicNNEmbeddings.hpp"
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#include <bit>
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#include <cstring>
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#include <limits>
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#include "audio/Exception.hpp"
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namespace lms::audio
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{
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static_assert(sizeof(float) == 4);
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static_assert(std::numeric_limits<float>::is_iec559);
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namespace
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{
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constexpr uint32_t byteswap32(uint32_t x)
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{
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return (x >> 24) | ((x >> 8) & 0x0000FF00u) | ((x << 8) & 0x00FF0000u) | (x << 24);
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}
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void writeFloats(std::span<const float> data, std::span<std::byte> blob)
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{
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if (blob.size() < data.size() * sizeof(uint32_t))
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throw Exception{ "Buffer too small to write MusicNN embeddings" };
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for (std::size_t i{}; i < data.size(); ++i)
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{
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uint32_t bits{ std::bit_cast<uint32_t>(data[i]) };
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if constexpr (std::endian::native == std::endian::little)
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bits = byteswap32(bits);
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std::memcpy(blob.data() + i * 4, &bits, 4);
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}
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}
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void readFloats(std::span<const std::byte> blob, std::span<float> data)
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{
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if (blob.size() < data.size() * sizeof(uint32_t))
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throw Exception{ "Buffer too small to read MusicNN embeddings" };
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for (std::size_t i{}; i < data.size(); ++i)
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{
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uint32_t bits{};
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std::memcpy(&bits, blob.data() + i * 4, 4);
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if constexpr (std::endian::native == std::endian::little)
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bits = byteswap32(bits);
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data[i] = std::bit_cast<float>(bits);
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}
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}
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} // anonymous namespace
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void trackMusicNNEmbeddingsToBlob(const TrackMusicNNEmbeddings& embeddings, std::span<std::byte> buffer)
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{
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if (buffer.size() < sizeof(TrackMusicNNEmbeddings))
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throw Exception{ "Buffer too small to write TrackMusicNNEmbeddings" };
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writeFloats(embeddings.mean.values, buffer.subspan(0, MusicNNEmbedding::size * sizeof(float)));
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}
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void trackMusicNNEmbeddingsFromBlob(std::span<const std::byte> buffer, TrackMusicNNEmbeddings& embeddings)
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{
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if (buffer.size() < sizeof(TrackMusicNNEmbeddings))
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throw Exception{ "Buffer too small to read TrackMusicNNEmbeddings" };
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readFloats(buffer.subspan(0, MusicNNEmbedding::size * sizeof(float)), embeddings.mean.values);
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}
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} // namespace lms::audio
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