124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
// Part of dump1090, a Mode S message decoder for RTLSDR devices.
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//
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// convert.c: support for various IQ -> magnitude conversions
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//
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// Copyright (c) 2015 Oliver Jowett <oliver@mutability.co.uk>
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//
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// This file is free software: you may copy, redistribute and/or modify it
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// under the terms of the GNU General Public License as published by the
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// Free Software Foundation, either version 2 of the License, or (at your
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// option) any later version.
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//
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// This file is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "dump1090.h"
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static void convert_uc8(void *iq_data,
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uint16_t *mag_data,
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unsigned nsamples,
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struct converter_state *state,
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double *out_mean_level,
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double *out_mean_power)
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{
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MODES_NOTUSED(state);
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const uc8_t *in = (const uc8_t *) iq_data;
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if (out_mean_level && out_mean_power) {
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if (STARCH_IS_ALIGNED(in) && STARCH_IS_ALIGNED(mag_data))
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starch_magnitude_power_uc8_aligned(in, mag_data, nsamples, out_mean_level, out_mean_power);
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else
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starch_magnitude_power_uc8(in, mag_data, nsamples, out_mean_level, out_mean_power);
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} else {
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if (STARCH_IS_ALIGNED(in) && STARCH_IS_ALIGNED(mag_data))
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starch_magnitude_uc8_aligned(in, mag_data, nsamples);
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else
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starch_magnitude_uc8(in, mag_data, nsamples);
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}
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}
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static void convert_sc16(void *iq_data,
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uint16_t *mag_data,
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unsigned nsamples,
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struct converter_state *state,
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double *out_mean_level,
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double *out_mean_power)
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{
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MODES_NOTUSED(state);
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const sc16_t *in = (const sc16_t *) iq_data;
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if (STARCH_IS_ALIGNED(in) && STARCH_IS_ALIGNED(mag_data))
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starch_magnitude_sc16_aligned(in, mag_data, nsamples);
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else
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starch_magnitude_sc16(in, mag_data, nsamples);
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if (out_mean_level && out_mean_power) {
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if (STARCH_IS_ALIGNED(mag_data))
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starch_mean_power_u16_aligned(mag_data, nsamples, out_mean_level, out_mean_power);
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else
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starch_mean_power_u16(mag_data, nsamples, out_mean_level, out_mean_power);
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}
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}
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static void convert_sc16q11(void *iq_data,
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uint16_t *mag_data,
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unsigned nsamples,
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struct converter_state *state,
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double *out_mean_level,
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double *out_mean_power)
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{
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MODES_NOTUSED(state);
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const sc16_t *in = (const sc16_t *) iq_data;
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if (STARCH_IS_ALIGNED(in) && STARCH_IS_ALIGNED(mag_data))
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starch_magnitude_sc16q11_aligned(in, mag_data, nsamples);
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else
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starch_magnitude_sc16q11(in, mag_data, nsamples);
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if (out_mean_level && out_mean_power) {
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if (STARCH_IS_ALIGNED(mag_data))
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starch_mean_power_u16_aligned(mag_data, nsamples, out_mean_level, out_mean_power);
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else
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starch_mean_power_u16(mag_data, nsamples, out_mean_level, out_mean_power);
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}
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}
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iq_convert_fn init_converter(input_format_t format,
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double sample_rate,
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int filter_dc,
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struct converter_state **out_state)
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{
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MODES_NOTUSED(sample_rate);
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MODES_NOTUSED(out_state);
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if (filter_dc) {
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fprintf(stderr, "DC filtering not supported (yet)\n");
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return NULL;
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}
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switch (format) {
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case INPUT_UC8:
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return convert_uc8;
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case INPUT_SC16:
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return convert_sc16;
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case INPUT_SC16Q11:
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return convert_sc16q11;
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default:
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fprintf(stderr, "no suitable converter for format=%u\n", (unsigned) format);
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return NULL;
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}
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}
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void cleanup_converter(struct converter_state *state)
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{
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MODES_NOTUSED(state);
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}
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