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/*
Copyright (C) 2005 The Pentagram team
Copyright (C) 2010-2022 The Exult Team
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "pent_include.h"
#include "RawAudioSample.h"
#include "endianio.h"
#include <cstring>
#include <new>
namespace Pentagram {
RawAudioSample::RawAudioSample(
std::unique_ptr<uint8[]> buffer_, uint32 size_, uint32 rate_,
bool signeddata_, bool stereo_)
: AudioSample(std::move(buffer_), size_), signeddata(signeddata_) {
sample_rate = rate_;
bits = 8;
stereo = stereo_;
frame_size = 512;
decompressor_size = sizeof(RawDecompData);
decompressor_align = alignof(RawDecompData);
length = size_;
start_pos = 0;
byte_swap = false;
}
void RawAudioSample::initDecompressor(void* DecompData) const {
auto* decomp = new (DecompData) RawDecompData;
decomp->pos = start_pos;
}
void RawAudioSample::freeDecompressor(void* DecompData) const {
auto* decomp = static_cast<RawDecompData*>(DecompData);
decomp->~RawDecompData();
}
uint32 RawAudioSample::decompressFrame(
void* DecompData, void* samples) const {
auto* decomp = static_cast<RawDecompData*>(DecompData);
if (decomp->pos == buffer_limit) {
return 0;
}
uint32 count = frame_size;
if (decomp->pos + count > buffer_limit) {
count = buffer_limit - decomp->pos;
}
count &= bits == 16 ? 0xFFFFFFFE : 0xFFFFFFFF;
if (count == 0) {
return 0;
}
if ((!signeddata && bits == 8)
|| (signeddata && bits == 16 && !byte_swap)) {
// 8 bit unsigned, or 16 Bit signed
std::memcpy(samples, buffer.get() + decomp->pos, count);
} else if (bits == 8) {
// 8 bit signed
auto* dest = static_cast<uint8*>(samples);
uint8* end = static_cast<uint8*>(samples) + count;
const uint8* src = buffer.get() + decomp->pos;
while (dest != end) {
*dest++ = *src++ + 128;
}
} else if (signeddata && bits == 16 && byte_swap) {
// 16 bit signed with byte swap
auto* dest = static_cast<sint16*>(samples);
sint16* end = static_cast<sint16*>(samples) + count / 2;
const uint8* src = buffer.get() + decomp->pos;
while (dest != end) {
*dest++ = big_endian::Read2(src);
}
} else if (!signeddata && bits == 16 && !byte_swap) {
// 16 bit unsigned
auto* dest = static_cast<sint16*>(samples);
sint16* end = static_cast<sint16*>(samples) + count / 2;
const uint8* src = buffer.get() + decomp->pos;
while (dest != end) {
*dest++ = little_endian::Read2(src) - 32768;
}
} else if (!signeddata && bits == 16 && byte_swap) {
// 16 bit unsigned with byte swap
auto* dest = static_cast<sint16*>(samples);
sint16* end = static_cast<sint16*>(samples) + count / 2;
const uint8* src = buffer.get() + decomp->pos;
while (dest != end) {
*dest++ = big_endian::Read2(src) - 32768;
}
}
decomp->pos += count;
return count;
}
} // namespace Pentagram
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