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sdr_ifile.c
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sdr_ifile.c
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// Part of readsb, a Mode-S/ADSB/TIS message decoder.
//
// sdr_ifile.c: "file" SDR support
//
// Copyright (c) 2020 Michael Wolf <michael@mictronics.de>
//
// This code is based on a detached fork of dump1090-fa.
//
// Copyright (c) 2014-2017 Oliver Jowett <oliver@mutability.co.uk>
// Copyright (c) 2017 FlightAware LLC
//
// This file 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
// any later version.
//
// This file 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, see <http://www.gnu.org/licenses/>.
//
// This file incorporates work covered by the following copyright and
// license:
//
// Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "readsb.h"
#include "sdr_ifile.h"
static struct {
input_format_t input_format;
int fd;
unsigned bytes_per_sample;
bool throttle;
unsigned bufsize;
char *readbuf;
iq_convert_fn converter;
struct converter_state *converter_state;
const char *filename;
} ifile;
void ifileInitConfig(void) {
ifile.filename = NULL;
ifile.input_format = INPUT_UC8;
ifile.throttle = false;
ifile.fd = -1;
ifile.bytes_per_sample = 0;
ifile.bufsize = 0;
ifile.readbuf = NULL;
ifile.converter = NULL;
ifile.converter_state = NULL;
}
bool ifileHandleOption(int argc, char *argv) {
switch (argc) {
case OptIfileName:
ifile.filename = strdup(argv);
Modes.sdr_type = SDR_IFILE;
break;
case OptIfileFormat:
if (!strcasecmp(argv, "uc8")) {
ifile.input_format = INPUT_UC8;
} else if (!strcasecmp(argv, "sc16")) {
ifile.input_format = INPUT_SC16;
} else if (!strcasecmp(argv, "sc16q11")) {
ifile.input_format = INPUT_SC16Q11;
} else {
fprintf(stderr, "Input format '%s' not understood (supported values: UC8, SC16, SC16Q11)\n",
argv);
return false;
}
break;
case OptIfileThrottle:
ifile.throttle = true;
break;
}
return true;
}
//
//=========================================================================
//
// This is used when --ifile is specified in order to read data from file
// instead of using an RTLSDR device
//
bool ifileOpen(void) {
if (!ifile.filename) {
fprintf(stderr, "SDR type 'ifile' requires an --ifile argument\n");
return false;
}
if (!strcmp(ifile.filename, "-")) {
ifile.fd = STDIN_FILENO;
} else if ((ifile.fd = open(ifile.filename, O_RDONLY)) < 0) {
fprintf(stderr, "ifile: could not open %s: %s\n",
ifile.filename, strerror(errno));
return false;
}
switch (ifile.input_format) {
case INPUT_UC8:
ifile.bytes_per_sample = 2;
break;
case INPUT_SC16:
case INPUT_SC16Q11:
ifile.bytes_per_sample = 4;
break;
default:
fprintf(stderr, "ifile: unhandled input format\n");
ifileClose();
return false;
}
ifile.bufsize = ifile.bytes_per_sample * MODES_MAG_BUF_SAMPLES; /* ~1M samples, about half a second's worth */
if (!(ifile.readbuf = malloc(ifile.bufsize))) {
fprintf(stderr, "ifile: failed to allocate read buffer\n");
ifileClose();
return false;
}
ifile.converter = init_converter(ifile.input_format,
Modes.sample_rate,
Modes.dc_filter,
&ifile.converter_state);
if (!ifile.converter) {
fprintf(stderr, "ifile: can't initialize sample converter\n");
ifileClose();
return false;
}
return true;
}
void ifileRun() {
if (ifile.fd < 0)
return;
struct timespec next_buffer_delivery;
clock_gettime(CLOCK_MONOTONIC, &next_buffer_delivery);
bool eof = false;
uint64_t sampleCounter = 0;
while (!Modes.exit && !eof) {
/* wait for up to 1000ms for a buffer */
struct mag_buf *outbuf = fifo_acquire(100 /* milliseconds */);
if (!outbuf) {
// maybe we're slow, maybe we halted
continue;
}
sdrMonitor();
// Compute the sample timestamp for the start of the block
outbuf->sampleTimestamp = sampleCounter * 12e6 / Modes.sample_rate;
// Get the system time for the start of this block
outbuf->sysTimestamp = outbuf->sampleTimestamp / 12000U + Modes.startup_time;
unsigned bytes_wanted = (outbuf->totalLength - outbuf->overlap) * ifile.bytes_per_sample;
if (bytes_wanted > ifile.bufsize) {
bytes_wanted = ifile.bufsize;
}
unsigned bytes_read = 0;
while (bytes_read < bytes_wanted) {
ssize_t nread = read(ifile.fd, ifile.readbuf + bytes_read, bytes_wanted - bytes_read);
if (nread <= 0) {
if (nread < 0) {
fprintf(stderr, "ifile: error reading input file: %s\n", strerror(errno));
}
// Done.
eof = true;
break;
}
bytes_read += nread;
}
unsigned samples_read = bytes_read / ifile.bytes_per_sample;
// Convert the new data
ifile.converter(ifile.readbuf, &outbuf->data[outbuf->overlap], samples_read, ifile.converter_state, &outbuf->mean_level, &outbuf->mean_power);
outbuf->validLength = outbuf->overlap + samples_read;
outbuf->flags = 0;
if (ifile.throttle || Modes.interactive) {
// Wait until we are allowed to release this buffer to the FIFO
while (clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, &next_buffer_delivery, NULL) == EINTR)
;
// compute the time we can deliver the next buffer.
next_buffer_delivery.tv_nsec += samples_read * 1e9 / Modes.sample_rate;
normalize_timespec(&next_buffer_delivery);
}
// Push the new data to the FIFO
fifo_enqueue(outbuf);
sampleCounter += samples_read;
}
// Wait for the FIFO to drain so we don't throw away trailing data
fifo_drain();
Modes.exit = 1;
}
void ifileClose() {
if (ifile.converter) {
cleanup_converter(ifile.converter_state);
ifile.converter = NULL;
ifile.converter_state = NULL;
}
if (ifile.readbuf) {
free(ifile.readbuf);
ifile.readbuf = NULL;
}
if (ifile.fd >= 0 && ifile.fd != STDIN_FILENO) {
close(ifile.fd);
ifile.fd = -1;
}
}