96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
/*
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* Copyright 2003-2022 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "Dop.hxx"
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#include "ChannelDefs.hxx"
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#include <cassert>
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#include <functional>
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static constexpr uint32_t
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pcm_two_dsd_to_dop_marker1(uint8_t a, uint8_t b) noexcept
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{
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return 0xff050000 | (a << 8) | b;
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}
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static constexpr uint32_t
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pcm_two_dsd_to_dop_marker2(uint8_t a, uint8_t b) noexcept
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{
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return 0xfffa0000 | (a << 8) | b;
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}
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/**
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* @param num_dop_quads the number of "quad" bytes per channel in the
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* source buffer; each "quad" will be converted to two 24 bit samples
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* in the destination buffer, one for each marker
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*/
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static void
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DsdToDop(uint32_t *dest, const uint8_t *src,
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size_t num_dop_quads, unsigned channels) noexcept
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{
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for (size_t i = num_dop_quads; i > 0; --i) {
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for (unsigned c = channels; c > 0; --c) {
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/* each 24 bit sample has 16 DSD sample bits
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plus the magic 0x05 marker */
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*dest++ = pcm_two_dsd_to_dop_marker1(src[0], src[channels]);
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/* seek the source pointer to the next
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channel */
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++src;
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}
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/* skip the second byte of each channel, because we
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have already copied it */
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src += channels;
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for (unsigned c = channels; c > 0; --c) {
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/* each 24 bit sample has 16 DSD sample bits
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plus the magic 0xfa marker */
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*dest++ = pcm_two_dsd_to_dop_marker2(src[0], src[channels]);
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/* seek the source pointer to the next
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channel */
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++src;
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}
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/* skip the second byte of each channel, because we
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have already copied it */
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src += channels;
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}
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}
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void
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DsdToDopConverter::Open(unsigned _channels) noexcept
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{
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assert(audio_valid_channel_count(_channels));
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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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DsdToDopConverter::Convert(std::span<const uint8_t> src) noexcept
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{
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return rest_buffer.Process<uint32_t>(buffer, src, 2 * channels,
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[this](auto && arg1, auto && arg2, auto && arg3) { return DsdToDop(arg1, arg2, arg3, channels); });
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}
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