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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2017
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
This flowgraph block converts complexf to signed integer.
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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 3 of the
License, or (at your option) any later version.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#include "FormatConverter.h"
#include "PcDebug.h"
#include <sys/types.h>
#include <string.h>
#include <stdexcept>
#include <assert.h>
#ifdef __SSE__
# include <xmmintrin.h>
#endif
FormatConverter::FormatConverter(const std::string& format) :
ModCodec(),
m_offset_by_127(format == "u8")
{ }
/* Expect the input samples to be in the range [-255.0, 255.0] */
int FormatConverter::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("FormatConverter::process(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
size_t sizeIn = dataIn->getLength() / sizeof(float);
dataOut->setLength(sizeIn * sizeof(int8_t));
float* in = reinterpret_cast<float*>(dataIn->getData());
#if 0
#error "TODO: SSE FormatConvert does not support u8 yet"
// Disabled because subscripting a __m64 doesn't seem to work
// on all platforms.
/*
_mm_cvtps_pi8 does:
|<----------- 128 bits ------------>|
__m128 | I1 | Q1 | I2 | Q2 | in float
__m64 |I1Q1I2Q2|00000000| in int8_t
*/
uint32_t* out = reinterpret_cast<uint32_t*>(dataOut->getData());
assert(sizeIn % 16 == 0);
assert((uintptr_t)in % 16 == 0);
for(size_t i = 0, j = 0; i < sizeIn; i+=16, j+=4)
{
__m128 a1 = _mm_load_ps(in+i+0);
__m128 a2 = _mm_load_ps(in+i+4);
__m128 a3 = _mm_load_ps(in+i+8);
__m128 a4 = _mm_load_ps(in+i+12);
__m64 b1 = _mm_cvtps_pi8(a1);
__m64 b2 = _mm_cvtps_pi8(a2);
__m64 b3 = _mm_cvtps_pi8(a3);
__m64 b4 = _mm_cvtps_pi8(a4);
out[j+0] = b1[0];
out[j+1] = b2[0];
out[j+2] = b3[0];
out[j+3] = b4[0];
}
#else
// Slow implementation that uses _ftol()
if (m_offset_by_127) {
uint8_t* out = reinterpret_cast<uint8_t*>(dataOut->getData());
for (size_t i = 0; i < sizeIn; i++) {
out[i] = in[i] + 128;
}
}
else {
int8_t* out = reinterpret_cast<int8_t*>(dataOut->getData());
for (size_t i = 0; i < sizeIn; i++) {
out[i] = in[i];
}
}
#endif
return 1;
}
const char* FormatConverter::name()
{
return "FormatConverter";
}
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