├── .gitignore ├── LICENSE ├── Makefile ├── README ├── ax25.c ├── ax25.h ├── ax25beacon.c └── ax25frame.c /.gitignore: -------------------------------------------------------------------------------- 1 | *~ 2 | *.wav 3 | *.o 4 | ax25beacon 5 | ax25frame 6 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | 2 | CC=gcc 3 | CFLAGS=-g -Wall -O3 4 | LDFLAGS=-g -lm 5 | 6 | AO_LDFLAGS=`pkg-config --libs ao` 7 | 8 | all: ax25beacon ax25frame 9 | 10 | ax25beacon: ax25.o ax25beacon.o 11 | $(CC) -o ax25beacon ax25.o ax25beacon.o $(LDFLAGS) $(AO_LDFLAGS) 12 | 13 | ax25frame: ax25.o ax25frame.o 14 | $(CC) -o ax25frame ax25.o ax25frame.o $(LDFLAGS) $(AO_LDFLAGS) 15 | 16 | .c.o: 17 | $(CC) $(CFLAGS) -c $< -o $@ 18 | 19 | install: 20 | cp -f ax25beacon /usr/local/bin/ 21 | cp -f ax25frame /usr/local/bin/ 22 | 23 | clean: 24 | rm -f *.o ax25beacon ax25frame 25 | 26 | -------------------------------------------------------------------------------- /README: -------------------------------------------------------------------------------- 1 | 2 | ax25beacon - Created by Philip Heron 3 | 4 | This simple command line program generates the audio tones for an 5 | AX.25 packet for use on the APRS network. It encodes position, altitude 6 | and an optional comment field. 7 | 8 | INSTALLING 9 | 10 | Run the following commands in the source folder to build and install ax25beacon: 11 | 12 | make 13 | make install 14 | 15 | Requires the libao development files to be installed. 16 | 17 | -Philip Heron 18 | 19 | -------------------------------------------------------------------------------- /ax25.c: -------------------------------------------------------------------------------- 1 | 2 | /* Copyright 2015 Philip Heron */ 3 | /* */ 4 | /* This program is free software: you can redistribute it and/or modify */ 5 | /* it under the terms of the GNU General Public License as published by */ 6 | /* the Free Software Foundation, either version 3 of the License, or */ 7 | /* (at your option) any later version. */ 8 | /* */ 9 | /* This program is distributed in the hope that it will be useful, */ 10 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 11 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ 12 | /* GNU General Public License for more details. */ 13 | /* */ 14 | /* You should have received a copy of the GNU General Public License */ 15 | /* along with this program. If not, see . */ 16 | 17 | #include 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include 23 | #include 24 | #include "ax25.h" 25 | 26 | /* Default configuration */ 27 | #define AX25_AFSK1200_SAMPLERATE (48000) 28 | #define AX25_AFSK1200_BITRATE (1200) 29 | #define AX25_AFSK1200_FREQ1 (1200) 30 | #define AX25_AFSK1200_FREQ2 (2200) 31 | #define AX25_AFSK1200_PREAMBLE_BYTES (25) 32 | #define AX25_AFSK1200_REST_BYTES (5) 33 | 34 | #define AX25_AFSK2400_SAMPLERATE (48000) 35 | #define AX25_AFSK2400_BITRATE (2400) 36 | #define AX25_AFSK2400_FREQ1 (2400) 37 | #define AX25_AFSK2400_FREQ2 (4400) 38 | #define AX25_AFSK2400_PREAMBLE_BYTES (25) 39 | #define AX25_AFSK2400_REST_BYTES (5) 40 | 41 | char *ax25_base91enc(char *s, uint8_t n, uint32_t v) 42 | { 43 | /* Creates a Base-91 representation of the value in v in the string */ 44 | /* pointed to by s, n-characters long. String length should be n+1. */ 45 | 46 | for(s += n, *s = '\0'; n; n--) 47 | { 48 | *(--s) = v % 91 + 33; 49 | v /= 91; 50 | } 51 | 52 | return(s); 53 | } 54 | 55 | /* This function is taken from avr-libc */ 56 | static uint16_t _crc_ccitt_update(uint16_t crc, uint8_t data) 57 | { 58 | data ^= crc & 0xFF; 59 | data ^= data << 4; 60 | 61 | return((((uint16_t) data << 8) | (crc >> 8)) ^ (uint8_t) (data >> 4) 62 | ^ ((uint16_t) data << 3)); 63 | } 64 | 65 | static uint8_t *_ax25_callsign(uint8_t *s, char *callsign) 66 | { 67 | char ssid; 68 | char i; 69 | for(i = 0; i < 6; i++) 70 | { 71 | if(*callsign && *callsign != '-') *(s++) = *(callsign++) << 1; 72 | else *(s++) = ' ' << 1; 73 | } 74 | 75 | if(*callsign == '-') ssid = atoi(callsign + 1); 76 | else ssid = 0; 77 | 78 | *(s++) = ('0' + ssid) << 1; 79 | return(s); 80 | } 81 | 82 | static size_t _ax25_txbit(ax25_t *ax25, int16_t **wav, uint8_t bit, uint8_t no_padding) 83 | { 84 | size_t len = ax25->samplerate / ax25->bitrate; 85 | int i; 86 | 87 | /* A zero bit is encoded by a change in frequency */ 88 | if(!bit) ax25->freq ^= ax25->freq1 ^ ax25->freq2; 89 | 90 | /* Generate the symbol */ 91 | for(i = 0; i < len; i++) 92 | { 93 | *((*wav)++) = (0.75 * 32768.0 * sin(ax25->phase)); 94 | ax25->phase += 2 * M_PI * ax25->freq / ax25->samplerate; 95 | } 96 | 97 | if(!no_padding) 98 | { 99 | /* If we have sent 5 one bits, stuff a zero bit in */ 100 | if(bit) ax25->bc++; else ax25->bc = 0; 101 | if(ax25->bc == 5) len += _ax25_txbit(ax25, wav, 0, 0); 102 | } 103 | else ax25->bc = 0; 104 | 105 | return(len); 106 | } 107 | 108 | static size_t _ax25_txbyte(ax25_t *ax25, int16_t **wav, uint8_t byte, uint8_t no_padding) 109 | { 110 | int i; 111 | size_t len = 0; 112 | 113 | for(i = 0; i < 8; i++) 114 | { 115 | len += _ax25_txbit(ax25, wav, byte & 1, no_padding); 116 | byte >>= 1; 117 | } 118 | 119 | return(len); 120 | } 121 | 122 | static size_t _ax25_tx(ax25_t *ax25, int16_t *wav, uint8_t *frame, size_t length) 123 | { 124 | int i; 125 | size_t len = 0; 126 | 127 | for(i = 0; i < ax25->preamble; i++) len += _ax25_txbyte(ax25, &wav, 0x7E, 1); 128 | for(i = 0; i < length; i++) len += _ax25_txbyte(ax25, &wav, frame[i], 0); 129 | for(i = 0; i < ax25->rest; i++) len += _ax25_txbyte(ax25, &wav, 0x7E, 1); 130 | 131 | return(len); 132 | } 133 | 134 | ax25_t *ax25_init(ax25_t *ax25, ax25_mode_t mode) 135 | { 136 | switch(mode) 137 | { 138 | case AX25_AFSK1200: 139 | ax25->samplerate = AX25_AFSK1200_SAMPLERATE; 140 | ax25->bitrate = AX25_AFSK1200_BITRATE; 141 | ax25->freq1 = AX25_AFSK1200_FREQ1; 142 | ax25->freq2 = AX25_AFSK1200_FREQ2; 143 | ax25->preamble = AX25_AFSK1200_PREAMBLE_BYTES; 144 | ax25->rest = AX25_AFSK1200_REST_BYTES; 145 | break; 146 | case AX25_AFSK2400: 147 | ax25->samplerate = AX25_AFSK2400_SAMPLERATE; 148 | ax25->bitrate = AX25_AFSK2400_BITRATE; 149 | ax25->freq1 = AX25_AFSK2400_FREQ1; 150 | ax25->freq2 = AX25_AFSK2400_FREQ2; 151 | ax25->preamble = AX25_AFSK2400_PREAMBLE_BYTES; 152 | ax25->rest = AX25_AFSK2400_REST_BYTES; 153 | break; 154 | } 155 | 156 | ax25->audio_callback = NULL; 157 | ax25->audio_callback_data = NULL; 158 | 159 | ax25->phase = 0; 160 | ax25->freq = ax25->freq1; 161 | ax25->bc = 0; 162 | 163 | return(ax25); 164 | } 165 | 166 | void ax25_set_audio_callback(ax25_t *ax25, void (*audio_callback)(void *, int16_t *, size_t), void *audio_callback_data) 167 | { 168 | ax25->audio_callback = audio_callback; 169 | ax25->audio_callback_data = audio_callback_data; 170 | } 171 | 172 | int ax25_frame(ax25_t *ax25, char *scallsign, char *dcallsign, char *path1, char *path2, char *data, ...) 173 | { 174 | uint8_t frame[AX25_MAX_LEN + 1]; 175 | int16_t *wav; 176 | size_t wav_len; 177 | uint8_t *s; 178 | uint16_t x; 179 | va_list va; 180 | 181 | va_start(va, data); 182 | 183 | /* Write in the callsigns and paths */ 184 | s = _ax25_callsign(frame, dcallsign); 185 | s = _ax25_callsign(s, scallsign); 186 | if(path1) s = _ax25_callsign(s, path1); 187 | if(path2) s = _ax25_callsign(s, path2); 188 | 189 | /* Mark the end of the callsigns */ 190 | s[-1] |= 1; 191 | 192 | *(s++) = 0x03; /* Control, 0x03 = APRS-UI frame */ 193 | *(s++) = 0xF0; /* Protocol ID: 0xF0 = no layer 3 data */ 194 | 195 | /* The maximum message length is AX25_MAX_LEN - callsigns - CRC */ 196 | /* 1 is added to allow room for vsnprintf's \0 at the end */ 197 | vsnprintf((char *) s, AX25_MAX_LEN - (s - frame) - 2 + 1, data, va); 198 | va_end(va); 199 | 200 | /* Calculate and append the checksum */ 201 | for(x = 0xFFFF, s = frame; *s; s++) 202 | x = _crc_ccitt_update(x, *s); 203 | 204 | *(s++) = ~(x & 0xFF); 205 | *(s++) = ~((x >> 8) & 0xFF); 206 | 207 | /* Allocate memory for the audio data */ 208 | wav_len = (s - frame + ax25->preamble + ax25->rest) * 8; /* Number of bits */ 209 | wav_len += wav_len / 5 + 1; /* Stuffing bits, worst case */ 210 | wav_len *= ax25->samplerate / ax25->bitrate; /* Samples per bit */ 211 | 212 | wav = calloc(wav_len, sizeof(int16_t)); 213 | if(!wav) return(AX25_OUT_OF_MEMORY); 214 | 215 | /* Generate the tones */ 216 | wav_len = _ax25_tx(ax25, wav, frame, s - frame); 217 | 218 | /* Fire the callback to play/save the audio data */ 219 | if(ax25->audio_callback) (*ax25->audio_callback)(ax25->audio_callback_data, wav, wav_len); 220 | 221 | free(wav); 222 | 223 | return(AX25_OK); 224 | } 225 | 226 | -------------------------------------------------------------------------------- /ax25.h: -------------------------------------------------------------------------------- 1 | 2 | /* Copyright 2015 Philip Heron */ 3 | /* */ 4 | /* This program is free software: you can redistribute it and/or modify */ 5 | /* it under the terms of the GNU General Public License as published by */ 6 | /* the Free Software Foundation, either version 3 of the License, or */ 7 | /* (at your option) any later version. */ 8 | /* */ 9 | /* This program is distributed in the hope that it will be useful, */ 10 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 11 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ 12 | /* GNU General Public License for more details. */ 13 | /* */ 14 | /* You should have received a copy of the GNU General Public License */ 15 | /* along with this program. If not, see . */ 16 | 17 | #ifndef _AX25_H 18 | #define _AX25_H 19 | #ifdef __cplusplus 20 | extern "C" { 21 | #endif 22 | 23 | #define AX25_OK (0) 24 | #define AX25_OUT_OF_MEMORY (1) 25 | 26 | /* AX.25 does not define a maximum packet size */ 27 | /* I set one here to keep things sensible */ 28 | #define AX25_MAX_LEN (512) 29 | 30 | typedef enum { 31 | AX25_AFSK1200 = 0, 32 | AX25_AFSK2400, 33 | } ax25_mode_t; 34 | 35 | typedef struct { 36 | 37 | /* Configuration */ 38 | uint16_t samplerate; 39 | ax25_mode_t mode; 40 | uint16_t bitrate; 41 | uint16_t freq1; 42 | uint16_t freq2; 43 | uint8_t preamble; 44 | uint8_t rest; 45 | 46 | /* Audio callback */ 47 | void (*audio_callback)(void *, int16_t *, size_t); 48 | void *audio_callback_data; 49 | 50 | /* State */ 51 | double phase; 52 | uint16_t freq; 53 | uint8_t bc; 54 | 55 | } ax25_t; 56 | 57 | extern char *ax25_base91enc(char *s, uint8_t n, uint32_t v); 58 | extern ax25_t *ax25_init(ax25_t *ax25, ax25_mode_t mode); 59 | extern void ax25_set_audio_callback(ax25_t *ax25, void (*audio_callback)(void *, int16_t *, size_t), void *audio_callback_data); 60 | extern int ax25_frame(ax25_t *ax25, char *scallsign, char *dcallsign, char *path1, char *path2, char *data, ...); 61 | 62 | #ifdef __cplusplus 63 | } 64 | #endif 65 | #endif 66 | 67 | -------------------------------------------------------------------------------- /ax25beacon.c: -------------------------------------------------------------------------------- 1 | 2 | /* Copyright 2015 Philip Heron */ 3 | /* */ 4 | /* This program is free software: you can redistribute it and/or modify */ 5 | /* it under the terms of the GNU General Public License as published by */ 6 | /* the Free Software Foundation, either version 3 of the License, or */ 7 | /* (at your option) any later version. */ 8 | /* */ 9 | /* This program is distributed in the hope that it will be useful, */ 10 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 11 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ 12 | /* GNU General Public License for more details. */ 13 | /* */ 14 | /* You should have received a copy of the GNU General Public License */ 15 | /* along with this program. If not, see . */ 16 | 17 | #include 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include "ax25.h" 23 | 24 | void _usage(void) 25 | { 26 | fprintf(stderr, 27 | "\n" 28 | "Usage: ax25beacon -s CALLSIGN[-NN] [-d CALLSIGN[-NN]] [-p PATH[-TTL]] [-r SAMPLERATE] [-P BYTES] [-R BYTES] [-o OUTPUT.WAV] [-t T] [-c C] LATITUDE LONGITUDE ALTITUDE [COMMENT]\n" 29 | "\n" 30 | " -s CALLSIGN[-NN] Sender callsign and optional SSID.\n" 31 | " -d CALLSIGN[-NN] Optional destination callsign and SSID.\n" 32 | " Defaults to \"APRS\".\n" 33 | " -p PATH[-TTL] Add a path with optional TTL.\n" 34 | " Up to two paths can be specified.\n" 35 | " -r SAMPLERATE The sample rate to use. Defaults to 48000Hz.\n" 36 | " -P BYTES Number of preamble bytes to send. Default is 25.\n" 37 | " -R BYTES Number of rest bytes to send. Default is 5.\n" 38 | " -o OUTPUT.WAV Output the audio to the specified WAV file.\n" 39 | " Defaults to the main audio device.\n" 40 | " -t T Set the symbol table to use. Default is '/'.\n" 41 | " -c C Set the symbol code to use. Default is 'O'.\n" 42 | " LATITUDE Latitude of the beacon position in decimal degrees.\n" 43 | " LONGITUDE Longitude of the beacon position in decimal degrees\n" 44 | " ALTITUDE Altitude of the beacon position in metres above sea level.\n" 45 | " COMMENT A comment to be appended to the packet.\n" 46 | "\n" 47 | "NOTE: When sending a negative coordinate, you must place -- before the value,\n" 48 | "otherwise the value will be treated as an option. For example:\n" 49 | "\n" 50 | " ax25beacon -s MYCALL -- 54.61 -6.40 0\n" 51 | "\n" 52 | ); 53 | exit(-1); 54 | } 55 | 56 | void _die(char *message) 57 | { 58 | fprintf(stderr, "%s", message); 59 | _usage(); 60 | } 61 | 62 | void audio_callback(void *data, int16_t *wav, size_t wav_len) 63 | { 64 | ao_device *ao = data; 65 | ao_play(ao, (char *) wav, wav_len * sizeof(int16_t)); 66 | } 67 | 68 | int main(int argc, char *argv[]) 69 | { 70 | int x; 71 | ao_device *ao_out; 72 | ao_sample_format ao_format; 73 | ax25_t ax25; 74 | char *wavfile = NULL; 75 | char *src_callsign = NULL; 76 | char *dst_callsign = NULL; 77 | char *path1 = NULL; 78 | char *path2 = NULL; 79 | float latitude, longitude, altitude; 80 | char sym_table = '/'; 81 | char sym_code = 'O'; 82 | char slat[5], slng[5]; 83 | char *comment = NULL; 84 | 85 | ax25_init(&ax25, AX25_AFSK1200); 86 | 87 | while((x = getopt(argc, argv, "s:d:p:r:P:R:o:t:c:")) != -1) 88 | { 89 | switch(x) 90 | { 91 | case 's': /* Sender callsign */ 92 | if(src_callsign) _die("Only one sender callsign can be used\n"); 93 | src_callsign = strdup(optarg); 94 | break; 95 | case 'd': /* Destination callsign */ 96 | if(dst_callsign) _die("Only one destination callsign can be used\n"); 97 | dst_callsign = strdup(optarg); 98 | break; 99 | case 'p': /* Add a path */ 100 | if(!path1) path1 = strdup(optarg); 101 | else if(!path2) path2 = strdup(optarg); 102 | else _die("Error: More than 2 paths specified\n"); 103 | break; 104 | case 'r': /* Sample Rate */ 105 | ax25.samplerate = atoi(optarg); 106 | break; 107 | case 'P': /* Preamble bytes */ 108 | ax25.preamble = atoi(optarg); 109 | break; 110 | case 'R': /* Rest bytes */ 111 | ax25.rest = atoi(optarg); 112 | break; 113 | case 'o': /* Output WAV filename */ 114 | if(wavfile) _die("Only one output WAV file can be used\n"); 115 | wavfile = strdup(optarg); 116 | break; 117 | case 't': /* Symbol table character */ 118 | sym_table = optarg[0]; 119 | break; 120 | case 'c': /* Symbol code character */ 121 | sym_code = optarg[0]; 122 | break; 123 | case '?': _usage(); 124 | } 125 | } 126 | 127 | if(!src_callsign) _die("No sender callsign specified\n"); 128 | if(!dst_callsign) dst_callsign = strdup("APRS"); 129 | 130 | x = argc - optind; 131 | if(x != 3 && x != 4) _usage(); 132 | 133 | latitude = atof(argv[optind + 0]); 134 | longitude = atof(argv[optind + 1]); 135 | altitude = atof(argv[optind + 2]); 136 | if(x == 4) comment = argv[optind + 3]; 137 | 138 | /* Setup AO */ 139 | ao_initialize(); 140 | 141 | /* Setup the output format */ 142 | memset(&ao_format, 0, sizeof(ao_format)); 143 | ao_format.bits = 16; 144 | ao_format.channels = 1; 145 | ao_format.rate = ax25.samplerate; 146 | ao_format.byte_format = AO_FMT_NATIVE; 147 | 148 | /* Open either the output audio device or WAV file */ 149 | if(wavfile) 150 | { 151 | /* A wav file has been specified */ 152 | x = ao_driver_id("wav"); 153 | ao_out = ao_open_file(x, wavfile, 1, &ao_format, NULL); 154 | } 155 | else 156 | { 157 | /* Output to the default sound device */ 158 | x = ao_default_driver_id(); 159 | ao_out = ao_open_live(x, &ao_format, NULL); 160 | } 161 | 162 | /* Was the driver opened OK? */ 163 | if(!ao_out) 164 | { 165 | fprintf(stderr, "Error opening output\n"); 166 | return(-1); 167 | } 168 | 169 | /* Set the audio callback to our AO player */ 170 | ax25_set_audio_callback(&ax25, &audio_callback, (void *) ao_out); 171 | 172 | /* Warn if the sample rate doesn't divide cleanly into the bit rate */ 173 | if(ax25.samplerate % ax25.bitrate != 0) printf("Warning: The sample rate %d does not divide evently into %d. The bit rate will be %.2f\n", ax25.samplerate, ax25.bitrate, (float) ax25.samplerate / (ax25.samplerate / ax25.bitrate)); 174 | 175 | /* Convert the position to the format APRS requires */ 176 | latitude = ( 90.0 - latitude) * 380926; 177 | longitude = (180.0 + longitude) * 190463; 178 | altitude = altitude * 3.2808399; 179 | 180 | ax25_base91enc(slat, 4, latitude); 181 | ax25_base91enc(slng, 4, longitude); 182 | 183 | /* Generate the audio tones and send to ao */ 184 | ax25_frame( 185 | &ax25, 186 | src_callsign, dst_callsign, 187 | path1, path2, 188 | "!%c%s%s%c /A=%06.0f%s", 189 | sym_table, slat, slng, sym_code, altitude, 190 | (comment ? comment : "") 191 | ); 192 | 193 | /* Close and shutdown AO */ 194 | ao_close(ao_out); 195 | ao_shutdown(); 196 | 197 | /* Free memory */ 198 | free(src_callsign); 199 | free(dst_callsign); 200 | if(path1) free(path1); 201 | if(path2) free(path2); 202 | if(wavfile) free(wavfile); 203 | 204 | return(0); 205 | } 206 | 207 | -------------------------------------------------------------------------------- /ax25frame.c: -------------------------------------------------------------------------------- 1 | 2 | /* Copyright 2015 Philip Heron */ 3 | /* */ 4 | /* This program is free software: you can redistribute it and/or modify */ 5 | /* it under the terms of the GNU General Public License as published by */ 6 | /* the Free Software Foundation, either version 3 of the License, or */ 7 | /* (at your option) any later version. */ 8 | /* */ 9 | /* This program is distributed in the hope that it will be useful, */ 10 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ 11 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ 12 | /* GNU General Public License for more details. */ 13 | /* */ 14 | /* You should have received a copy of the GNU General Public License */ 15 | /* along with this program. If not, see . */ 16 | 17 | #include 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include "ax25.h" 23 | 24 | void _usage(void) 25 | { 26 | fprintf(stderr, 27 | "\n" 28 | "Usage: ax25frame -s CALLSIGN[-NN] [-d CALLSIGN[-NN]] [-p PATH[-TTL]] [-r SAMPLERATE] [-P BYTES] [-R BYTES] [-o OUTPUT.WAV] DATA\n" 29 | "\n" 30 | " -s CALLSIGN[-NN] Sender callsign and optional SSID.\n" 31 | " -d CALLSIGN[-NN] Optional destination callsign and SSID.\n" 32 | " Defaults to \"APRS\".\n" 33 | " -p PATH[-TTL] Add a path with optional TTL.\n" 34 | " Up to two paths can be specified.\n" 35 | " -r SAMPLERATE The sample rate to use. Defaults to 48000Hz.\n" 36 | " -P BYTES Number of preamble bytes to send. Default is 25.\n" 37 | " -R BYTES Number of rest bytes to send. Default is 5.\n" 38 | " -o OUTPUT.WAV Output the audio to the specified WAV file.\n" 39 | " Defaults to the main audio device.\n" 40 | " DATA The packet contents.\n" 41 | "\n" 42 | ); 43 | 44 | exit(-1); 45 | } 46 | 47 | void _die(char *message) 48 | { 49 | fprintf(stderr, "%s", message); 50 | _usage(); 51 | } 52 | 53 | void audio_callback(void *data, int16_t *wav, size_t wav_len) 54 | { 55 | ao_device *ao = data; 56 | ao_play(ao, (char *) wav, wav_len * sizeof(int16_t)); 57 | } 58 | 59 | int main(int argc, char *argv[]) 60 | { 61 | int x; 62 | ao_device *ao_out; 63 | ao_sample_format ao_format; 64 | ax25_t ax25; 65 | char *wavfile = NULL; 66 | char *src_callsign = NULL; 67 | char *dst_callsign = NULL; 68 | char *path1 = NULL; 69 | char *path2 = NULL; 70 | 71 | ax25_init(&ax25, AX25_AFSK1200); 72 | 73 | while((x = getopt(argc, argv, "s:d:p:r:P:R:o:")) != -1) 74 | { 75 | switch(x) 76 | { 77 | case 's': /* Sender callsign */ 78 | if(src_callsign) _die("Only one sender callsign can be used\n"); 79 | src_callsign = strdup(optarg); 80 | break; 81 | case 'd': /* Destination callsign */ 82 | if(dst_callsign) _die("Only one destination callsign can be used\n"); 83 | dst_callsign = strdup(optarg); 84 | break; 85 | case 'p': /* Add a path */ 86 | if(!path1) path1 = strdup(optarg); 87 | else if(!path2) path2 = strdup(optarg); 88 | else _die("Error: More than 2 paths specified\n"); 89 | break; 90 | case 'r': /* Sample Rate */ 91 | ax25.samplerate = atoi(optarg); 92 | break; 93 | case 'P': /* Preamble bytes */ 94 | ax25.preamble = atoi(optarg); 95 | break; 96 | case 'R': /* Rest bytes */ 97 | ax25.rest = atoi(optarg); 98 | break; 99 | case 'o': /* Output WAV filename */ 100 | if(wavfile) _die("Only one output WAV file can be used\n"); 101 | wavfile = strdup(optarg); 102 | break; 103 | case '?': _usage(); 104 | } 105 | } 106 | 107 | if(!src_callsign) _die("No sender callsign specified\n"); 108 | if(!dst_callsign) dst_callsign = strdup("APRS"); 109 | 110 | x = argc - optind; 111 | if(x != 1) _usage(); 112 | 113 | /* Setup AO */ 114 | ao_initialize(); 115 | 116 | /* Setup the output format */ 117 | memset(&ao_format, 0, sizeof(ao_format)); 118 | ao_format.bits = 16; 119 | ao_format.channels = 1; 120 | ao_format.rate = ax25.samplerate; 121 | ao_format.byte_format = AO_FMT_NATIVE; 122 | 123 | /* Open either the output audio device or WAV file */ 124 | if(wavfile) 125 | { 126 | /* A wav file has been specified */ 127 | x = ao_driver_id("wav"); 128 | ao_out = ao_open_file(x, wavfile, 1, &ao_format, NULL); 129 | } 130 | else 131 | { 132 | /* Output to the default sound device */ 133 | x = ao_default_driver_id(); 134 | ao_out = ao_open_live(x, &ao_format, NULL); 135 | } 136 | 137 | /* Was the driver opened OK? */ 138 | if(!ao_out) 139 | { 140 | fprintf(stderr, "Error opening output\n"); 141 | return(-1); 142 | } 143 | 144 | /* Set the audio callback to our AO player */ 145 | ax25_set_audio_callback(&ax25, &audio_callback, (void *) ao_out); 146 | 147 | /* Warn if the sample rate doesn't divide cleanly into the bit rate */ 148 | if(ax25.samplerate % ax25.bitrate != 0) printf("Warning: The sample rate %d does not divide evently into %d. The bit rate will be %.2f\n", ax25.samplerate, ax25.bitrate, (float) ax25.samplerate / (ax25.samplerate / ax25.bitrate)); 149 | 150 | /* Generate the packet audio */ 151 | ax25_frame( 152 | &ax25, 153 | src_callsign, dst_callsign, 154 | path1, path2, 155 | "%s", argv[optind] 156 | ); 157 | 158 | /* Close and shutdown AO */ 159 | ao_close(ao_out); 160 | ao_shutdown(); 161 | 162 | /* Free memory */ 163 | free(src_callsign); 164 | free(dst_callsign); 165 | if(path1) free(path1); 166 | if(path2) free(path2); 167 | if(wavfile) free(wavfile); 168 | 169 | return(0); 170 | } 171 | 172 | --------------------------------------------------------------------------------