112 lines
2.7 KiB
C++
112 lines
2.7 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 "Interleave.hxx"
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#include <string.h>
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static void
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GenericPcmInterleave(uint8_t *gcc_restrict dest,
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std::span<const uint8_t *const> src,
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size_t n_frames, size_t sample_size) noexcept
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{
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for (size_t frame = 0; frame < n_frames; ++frame) {
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for (size_t channel = 0; channel < src.size(); ++channel) {
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memcpy(dest, src[channel] + frame * sample_size,
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sample_size);
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dest += sample_size;
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}
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}
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}
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template<typename T>
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static void
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PcmInterleaveStereo(T *gcc_restrict dest,
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const T *gcc_restrict src1,
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const T *gcc_restrict src2,
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size_t n_frames) noexcept
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{
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for (size_t i = 0; i != n_frames; ++i) {
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*dest++ = *src1++;
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*dest++ = *src2++;
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}
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}
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template<typename T>
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static void
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PcmInterleaveT(T *gcc_restrict dest,
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const std::span<const T *const> src,
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size_t n_frames) noexcept
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{
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switch (src.size()) {
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case 2:
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PcmInterleaveStereo(dest, src[0], src[1], n_frames);
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return;
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}
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for (const auto *s : src) {
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auto *d = dest++;
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for (const auto *const s_end = s + n_frames;
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s != s_end; ++s, d += src.size())
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*d = *s;
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}
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}
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static void
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PcmInterleave16(int16_t *gcc_restrict dest,
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const std::span<const int16_t *const> src,
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size_t n_frames) noexcept
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{
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PcmInterleaveT(dest, src, n_frames);
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}
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void
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PcmInterleave32(int32_t *gcc_restrict dest,
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const std::span<const int32_t *const> src,
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size_t n_frames) noexcept
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{
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PcmInterleaveT(dest, src, n_frames);
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}
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void
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PcmInterleave(void *gcc_restrict dest,
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std::span<const void *const> src,
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size_t n_frames, size_t sample_size) noexcept
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{
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switch (sample_size) {
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case 2:
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PcmInterleave16((int16_t *)dest,
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{(const int16_t *const*)src.data(), src.size()},
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n_frames);
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break;
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case 4:
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PcmInterleave32((int32_t *)dest,
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{(const int32_t *const*)src.data(), src.size()},
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n_frames);
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break;
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default:
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GenericPcmInterleave((uint8_t *)dest,
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{(const uint8_t *const*)src.data(), src.size()},
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n_frames, sample_size);
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}
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}
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