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/*
* This file is part of the bladeRF project:
* http://www.github.com/nuand/bladeRF
*
* Copyright (C) 2017 Nuand LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <libbladeRF.h>
#include "helpers/interleave.h"
size_t _interleave_calc_num_channels(bladerf_channel_layout layout)
{
switch (layout) {
case BLADERF_RX_X1:
case BLADERF_TX_X1:
return 1;
case BLADERF_RX_X2:
case BLADERF_TX_X2:
return 2;
}
return 0;
}
size_t _interleave_calc_bytes_per_sample(bladerf_format format)
{
switch (format) {
case BLADERF_FORMAT_SC8_Q7:
case BLADERF_FORMAT_SC8_Q7_META:
return 2;
case BLADERF_FORMAT_SC16_Q11:
case BLADERF_FORMAT_SC16_Q11_META:
case BLADERF_FORMAT_PACKET_META:
return 4;
}
return 0;
}
size_t _interleave_calc_metadata_bytes(bladerf_format format)
{
switch (format) {
case BLADERF_FORMAT_SC8_Q7_META:
case BLADERF_FORMAT_SC16_Q11_META:
case BLADERF_FORMAT_PACKET_META:
return 0x10;
case BLADERF_FORMAT_SC8_Q7:
case BLADERF_FORMAT_SC16_Q11:
return 0;
}
return 0;
}
int _interleave_interleave_buf(bladerf_channel_layout layout,
bladerf_format format,
unsigned int buffer_size,
void *samples)
{
void *buf;
uint8_t *srcptr, *dstptr;
size_t num_channels = _interleave_calc_num_channels(layout);
size_t samp_size, meta_size, samps_per_ch;
size_t srcidx, dstidx, samp, ch;
// Easy:
if (num_channels < 2) {
return 0;
}
// Placeholder for an actually efficient algorithm
samp_size = _interleave_calc_bytes_per_sample(format);
meta_size = _interleave_calc_metadata_bytes(format);
samps_per_ch = buffer_size / num_channels;
buf = malloc(samp_size * buffer_size);
srcptr = samples;
dstptr = buf;
if (NULL == buf) {
return BLADERF_ERR_MEM;
}
// Copy metadata if applicable
if (meta_size > 0) {
memcpy(dstptr, srcptr, meta_size);
srcptr += meta_size;
dstptr += meta_size;
samps_per_ch -= (meta_size / samp_size / num_channels);
}
// Iterate...
for (ch = 0; ch < num_channels; ++ch) {
srcidx = samps_per_ch * ch;
for (samp = 0; samp < samps_per_ch; ++samp) {
dstidx = (samp * num_channels) + ch;
memcpy(dstptr + (dstidx * samp_size),
srcptr + ((srcidx + samp) * samp_size),
samp_size);
}
}
// Copy back...
memcpy(samples, buf, buffer_size * samp_size);
// Done
free(buf);
return 0;
}
int _interleave_deinterleave_buf(bladerf_channel_layout layout,
bladerf_format format,
unsigned int buffer_size,
void *samples)
{
void *buf;
uint8_t *srcptr, *dstptr;
size_t num_channels = _interleave_calc_num_channels(layout);
size_t samp_size, meta_size, samps_per_ch;
size_t srcidx, dstidx, samp, ch;
// Easy:
if (num_channels < 2) {
return 0;
}
// Placeholder for an actually efficient algorithm
samp_size = _interleave_calc_bytes_per_sample(format);
meta_size = _interleave_calc_metadata_bytes(format);
samps_per_ch = buffer_size / num_channels;
buf = malloc(samp_size * buffer_size);
srcptr = samples;
dstptr = buf;
if (NULL == buf) {
return BLADERF_ERR_MEM;
}
// Copy metadata if applicable
if (meta_size > 0) {
memcpy(dstptr, srcptr, meta_size);
srcptr += meta_size;
dstptr += meta_size;
samps_per_ch -= (meta_size / samp_size / num_channels);
}
// Iterate...
for (samp = 0; samp < samps_per_ch; ++samp) {
srcidx = num_channels * samp;
for (ch = 0; ch < num_channels; ++ch) {
dstidx = (samps_per_ch * ch) + samp;
memcpy(dstptr + (dstidx * samp_size),
srcptr + ((srcidx + ch) * samp_size), samp_size);
}
}
// Copy back...
memcpy(samples, buf, buffer_size * samp_size);
// Done
free(buf);
return 0;
}
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