52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "Dsd32.hxx"
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/**
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* Construct a 32 bit integer from four bytes.
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*/
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static constexpr uint32_t
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Construct32(std::byte a, std::byte b, std::byte c, std::byte d) noexcept
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{
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/* "a" is the oldest byte, which must be in the most
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significant byte */
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return uint32_t(d) | (uint32_t(c) << 8) |
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(uint32_t(b) << 16) | (uint32_t(a) << 24);
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}
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static constexpr uint32_t
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Dsd8To32Sample(const std::byte *src, unsigned channels) noexcept
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{
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return Construct32(src[0], src[channels],
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src[2 * channels], src[3 * channels]);
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}
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static void
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Dsd8To32(uint32_t *dest, const std::byte *src,
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size_t out_frames, unsigned channels) noexcept
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{
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for (size_t i = 0; i < out_frames; ++i) {
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for (size_t c = 0; c < channels; ++c)
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*dest++ = Dsd8To32Sample(src++, channels);
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src += 3 * channels;
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}
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}
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void
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Dsd32Converter::Open(unsigned _channels) noexcept
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{
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channels = _channels;
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rest_buffer.Open(channels);
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}
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std::span<const uint32_t>
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Dsd32Converter::Convert(std::span<const std::byte> src) noexcept
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{
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return rest_buffer.Process<uint32_t>(buffer, src, channels,
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[this](auto && arg1, auto && arg2, auto && arg3) { return Dsd8To32(arg1, arg2, arg3, channels); });
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}
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