96 lines
2.0 KiB
C++
96 lines
2.0 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
// Copyright The Music Player Daemon Project
|
|
|
|
#include "Interleave.hxx"
|
|
|
|
#include <string.h>
|
|
|
|
static void
|
|
GenericPcmInterleave(std::byte *gcc_restrict dest,
|
|
std::span<const std::byte *const> src,
|
|
size_t n_frames, size_t sample_size) noexcept
|
|
{
|
|
for (size_t frame = 0; frame < n_frames; ++frame) {
|
|
for (size_t channel = 0; channel < src.size(); ++channel) {
|
|
memcpy(dest, src[channel] + frame * sample_size,
|
|
sample_size);
|
|
dest += sample_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
static void
|
|
PcmInterleaveStereo(T *gcc_restrict dest,
|
|
const T *gcc_restrict src1,
|
|
const T *gcc_restrict src2,
|
|
size_t n_frames) noexcept
|
|
{
|
|
for (size_t i = 0; i != n_frames; ++i) {
|
|
*dest++ = *src1++;
|
|
*dest++ = *src2++;
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
static void
|
|
PcmInterleaveT(T *gcc_restrict dest,
|
|
const std::span<const T *const> src,
|
|
size_t n_frames) noexcept
|
|
{
|
|
switch (src.size()) {
|
|
case 2:
|
|
PcmInterleaveStereo(dest, src[0], src[1], n_frames);
|
|
return;
|
|
}
|
|
|
|
for (const auto *s : src) {
|
|
auto *d = dest++;
|
|
|
|
for (const auto *const s_end = s + n_frames;
|
|
s != s_end; ++s, d += src.size())
|
|
*d = *s;
|
|
}
|
|
}
|
|
|
|
static void
|
|
PcmInterleave16(int16_t *gcc_restrict dest,
|
|
const std::span<const int16_t *const> src,
|
|
size_t n_frames) noexcept
|
|
{
|
|
PcmInterleaveT(dest, src, n_frames);
|
|
}
|
|
|
|
void
|
|
PcmInterleave32(int32_t *gcc_restrict dest,
|
|
const std::span<const int32_t *const> src,
|
|
size_t n_frames) noexcept
|
|
{
|
|
PcmInterleaveT(dest, src, n_frames);
|
|
}
|
|
|
|
void
|
|
PcmInterleave(void *gcc_restrict dest,
|
|
std::span<const void *const> src,
|
|
size_t n_frames, size_t sample_size) noexcept
|
|
{
|
|
switch (sample_size) {
|
|
case 2:
|
|
PcmInterleave16((int16_t *)dest,
|
|
{(const int16_t *const*)src.data(), src.size()},
|
|
n_frames);
|
|
break;
|
|
|
|
case 4:
|
|
PcmInterleave32((int32_t *)dest,
|
|
{(const int32_t *const*)src.data(), src.size()},
|
|
n_frames);
|
|
break;
|
|
|
|
default:
|
|
GenericPcmInterleave((std::byte *)dest,
|
|
{(const std::byte *const*)src.data(), src.size()},
|
|
n_frames, sample_size);
|
|
}
|
|
}
|