FreeCalypso > hg > sipout-test-utils
view test-fsk/modem_rx.c @ 8:eaf0e8f81a22
test-fsk: don't feed RTP to modem Rx during ringing
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 06 Mar 2024 21:33:49 -0800 |
parents | 6d832abad660 |
children |
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/* * In this module we implement modem Rx handling, revolving around * FSK demodulation via SpanDSP. */ #include <sys/types.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <spandsp.h> #include "../include/pstn_defs.h" extern int fsk_mode_rx; #define MAX_TEXT_LINE 80 static fsk_rx_state_t *fsk_rx_state; static u_char rx_line_buf[MAX_TEXT_LINE]; static unsigned rx_buf_fill; static void safe_print_char(c) { if (c >= ' ' && c <= '~') { putchar(c); return; } switch (c) { case '\t': putchar(c); return; case '\n': return; case '\r': putchar('\\'); putchar('r'); return; case '\b': putchar('\\'); putchar('b'); return; case '\f': putchar('\\'); putchar('f'); return; } printf("\\x%02X", c); } static void print_rx_line() { u_char *dp, *endp; int c; fputs("MRx:\t", stdout); dp = rx_line_buf; endp = rx_line_buf + rx_buf_fill; while (dp < endp) { c = *dp++; safe_print_char(c); } if (c != '\n') putchar('\\'); putchar('\n'); } static void byte_rx_func(user_data, byte) void *user_data; int byte; { if (byte < 0) { printf("Modem state change: %s\n", signal_status_to_str(byte)); return; } rx_line_buf[rx_buf_fill++] = byte; if (byte == '\n' || rx_buf_fill >= MAX_TEXT_LINE) { print_rx_line(); rx_buf_fill = 0; } } void init_modem_rx() { fsk_rx_state = fsk_rx_init(NULL, &preset_fsk_specs[fsk_mode_rx], FSK_FRAME_MODE_FRAMED, byte_rx_func, NULL); if (!fsk_rx_state) { fprintf(stderr, "error: fsk_rx_init() failed!\n"); exit(1); } } void process_rx_frame(samples) int16_t *samples; { fsk_rx(fsk_rx_state, samples, FRAME_20MS); }