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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) 2023
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>
FormatConverter::FormatConverter(const std::string& format) :
ModCodec(),
m_format(format)
{ }
/* Expect the input samples to be in the correct range for the required format */
int FormatConverter::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("FormatConverter::process(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
size_t num_clipped_samples = 0;
size_t sizeIn = dataIn->getLength() / sizeof(float);
float* in = reinterpret_cast<float*>(dataIn->getData());
if (m_format == "s16") {
dataOut->setLength(sizeIn * sizeof(int16_t));
int16_t* out = reinterpret_cast<int16_t*>(dataOut->getData());
for (size_t i = 0; i < sizeIn; i++) {
if (in[i] < INT16_MIN) {
out[i] = INT16_MIN;
num_clipped_samples++;
}
else if (in[i] > INT16_MAX) {
out[i] = INT16_MAX;
num_clipped_samples++;
}
else {
out[i] = in[i];
}
}
}
else if (m_format == "u8") {
dataOut->setLength(sizeIn * sizeof(int8_t));
uint8_t* out = reinterpret_cast<uint8_t*>(dataOut->getData());
for (size_t i = 0; i < sizeIn; i++) {
const auto samp = in[i] + 128.0f;
if (samp < 0) {
out[i] = 0;
num_clipped_samples++;
}
else if (samp > INT8_MAX) {
out[i] = INT8_MAX;
num_clipped_samples++;
}
else {
out[i] = samp;
}
}
}
else if (m_format == "s8") {
dataOut->setLength(sizeIn * sizeof(int8_t));
int8_t* out = reinterpret_cast<int8_t*>(dataOut->getData());
for (size_t i = 0; i < sizeIn; i++) {
if (in[i] < INT8_MIN) {
out[i] = INT8_MIN;
num_clipped_samples++;
}
else if (in[i] > INT8_MAX) {
out[i] = INT8_MAX;
num_clipped_samples++;
}
else {
out[i] = in[i];
}
}
}
else {
throw std::runtime_error("FormatConverter: Invalid format " + m_format);
}
m_num_clipped_samples.store(num_clipped_samples);
return dataOut->getLength();
}
const char* FormatConverter::name()
{
return "FormatConverter";
}
size_t FormatConverter::get_num_clipped_samples() const
{
return m_num_clipped_samples.load();
}
size_t FormatConverter::get_format_size(const std::string& format)
{
// Returns 2*sizeof(SAMPLE_TYPE) because we have I + Q
if (format == "s16") {
return 4;
}
else if (format == "u8") {
return 2;
}
else if (format == "s8") {
return 2;
}
else {
throw std::runtime_error("FormatConverter: Invalid format " + format);
}
}
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