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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "PcmDsd.hxx"
#include "dsd2pcm/dsd2pcm.h"
#include "util/ConstBuffer.hxx"
#include <assert.h>
PcmDsd::PcmDsd()
{
dsd2pcm.fill(nullptr);
}
PcmDsd::~PcmDsd()
{
for (auto i : dsd2pcm)
if (i != nullptr)
dsd2pcm_destroy(i);
}
void
PcmDsd::Reset()
{
for (auto i : dsd2pcm)
if (i != nullptr)
dsd2pcm_reset(i);
}
ConstBuffer<float>
PcmDsd::ToFloat(unsigned channels, ConstBuffer<uint8_t> src)
{
assert(!src.IsNull());
assert(!src.IsEmpty());
assert(src.size % channels == 0);
assert(channels <= dsd2pcm.max_size());
const unsigned num_samples = src.size;
const unsigned num_frames = src.size / channels;
float *dest = buffer.GetT<float>(num_samples);
for (unsigned c = 0; c < channels; ++c) {
if (dsd2pcm[c] == nullptr) {
dsd2pcm[c] = dsd2pcm_init();
if (dsd2pcm[c] == nullptr)
return nullptr;
}
dsd2pcm_translate(dsd2pcm[c], num_frames,
src.data + c, channels,
false, dest + c, channels);
}
return { dest, num_samples };
}
/**
* Construct a 32 bit integer from four bytes.
*/
static constexpr inline uint32_t
Construct32(uint8_t a, uint8_t b, uint8_t c, uint8_t d)
{
return uint32_t(a) | (uint32_t(b) << 8) |
(uint32_t(c) << 16) | (uint32_t(d) << 24);
}
static constexpr inline uint32_t
Dsd8To32Sample(const uint8_t *src, unsigned channels)
{
return Construct32(src[0], src[channels],
src[2 * channels], src[3 * channels]);
}
ConstBuffer<uint32_t>
Dsd8To32(PcmBuffer &buffer, unsigned channels, ConstBuffer<uint8_t> _src)
{
const size_t in_frames = _src.size / channels;
const size_t out_frames = in_frames / 4;
const size_t out_samples = out_frames * channels;
const uint8_t *src = _src.data;
uint32_t *const dest0 = buffer.GetT<uint32_t>(out_samples);
uint32_t *dest = dest0;
for (size_t i = 0; i < out_frames; ++i) {
for (size_t c = 0; c < channels; ++c)
*dest++ = Dsd8To32Sample(src++, channels);
src += 3 * channels;
}
return {dest0, out_samples};
}
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