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librtlsdr
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injection of received SNR into packet

development
David Rowe 2020-11-13 23:15:23 +00:00
parent c3e944f7a4
commit e03a0bfa41
1 changed files with 9 additions and 5 deletions
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14
src/rtl_fsk.c
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@ -111,6 +111,7 @@ static int verbose = 0;
static int data_bytes_per_frame; static int data_bytes_per_frame;
static int periodic_output = 0; static int periodic_output = 0;
static uint8_t filter = 0; static uint8_t filter = 0;
static int inject_snr = 0;
void usage(void) void usage(void)
{ {
@ -124,7 +125,6 @@ void usage(void)
"\t[-g gain (default: 0 for auto)]\n" "\t[-g gain (default: 0 for auto)]\n"
"\t[-p ppm_error (default: 0)]\n" "\t[-p ppm_error (default: 0)]\n"
"\t[-M modn order (default: 2)]\n" "\t[-M modn order (default: 2)]\n"
"\t[-b output_block_size (default: 16 * 16384)]\n"
"\t[-n number of samples to read (default: 0, infinite)]\n" "\t[-n number of samples to read (default: 0, infinite)]\n"
"\t[-q periodic | status byte | data bytes | output (default: off)]\n" "\t[-q periodic | status byte | data bytes | output (default: off)]\n"
"\t[-S force sync output (default: async)]\n" "\t[-S force sync output (default: async)]\n"
@ -137,6 +137,7 @@ void usage(void)
"\t[--listcodes List available LDPC codes]\n" "\t[--listcodes List available LDPC codes]\n"
"\t[--testframes] Built in testframe mode\n" "\t[--testframes] Built in testframe mode\n"
"\t[--filter Byte Filter (don't output) FSK_LDPC frames starting with (non-zero) Byte\n" "\t[--filter Byte Filter (don't output) FSK_LDPC frames starting with (non-zero) Byte\n"
"\t[--injectsnr inject S and N floats into packet output\n"
"\tfilename ( '-' dumps bits to stdout)\n\n", DEFAULT_MODEM_SAMPLE_RATE, DEFAULT_SAMPLE_RATE, DEFAULT_SYMBOL_RATE, DEFAULT_M); "\tfilename ( '-' dumps bits to stdout)\n\n", DEFAULT_MODEM_SAMPLE_RATE, DEFAULT_SAMPLE_RATE, DEFAULT_SYMBOL_RATE, DEFAULT_M);
exit(1); exit(1);
} }
@ -378,10 +379,12 @@ static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
if (bytes_out[0] == filter) if (bytes_out[0] == filter)
rx_status &= ~FREEDV_RX_BITS; rx_status &= ~FREEDV_RX_BITS;
} }
if (rx_status & FREEDV_RX_BITS) { if (inject_snr && (rx_status & FREEDV_RX_BITS)) {
float S,N; float S,N;
freedv_get_fsk_S_and_N(freedv, &S, &N); freedv_get_fsk_S_and_N(freedv, &S, &N);
fprintf(stderr, "S: %f N: %f snr: %f\n", S, N, 10*log10(S/N)); //fprintf(stderr, "S: %f N: %f snr: %f\n", S, N, 10*log10(S/N));
memcpy(&bytes_out[2], (uint8_t*)&S, sizeof(float));
memcpy(&bytes_out[6], (uint8_t*)&N, sizeof(float));
} }
} }
@ -470,10 +473,11 @@ int main(int argc, char **argv)
{"vv", no_argument, 0, 'l'}, {"vv", no_argument, 0, 'l'},
{"mask", required_argument, 0, 't'}, {"mask", required_argument, 0, 't'},
{"filter", required_argument, 0, 'o'}, {"filter", required_argument, 0, 'o'},
{"injectsnr", no_argument, 0, 'n'},
{0, 0, 0, 0} {0, 0, 0, 0}
}; };
opt = getopt_long(argc,argv,"a:d:e:f:g:s:b:n:p:S:u:r:m:c:M:R:xt:w:jk:vq",long_opts,&opt_idx); opt = getopt_long(argc,argv,"a:d:e:f:g:s:bn:p:S:u:r:m:c:M:R:xt:w:jk:vq",long_opts,&opt_idx);
if (opt != -1) { if (opt != -1) {
switch (opt) { switch (opt) {
case 'a': case 'a':
@ -523,7 +527,7 @@ int main(int argc, char **argv)
periodic_output = 1; periodic_output = 1;
break; break;
case 'b': case 'b':
out_block_size = (uint32_t)atof(optarg); inject_snr = 1;
break; break;
case 'n': case 'n':
bytes_to_read = (uint32_t)atof(optarg) * 2; bytes_to_read = (uint32_t)atof(optarg) * 2;