FreeCalypso > hg > ice1-trau-tester

annotate pcm/pcm_tx.c @ 9:e3d16d490ce2

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pcm: implement dmw-on and dmw-off commands
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 23 Jun 2024 19:34:08 +0000
parents 70aa8cbdbde9
children 5cf7818a7d08
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1 /*
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2 * In this module we implement PCM Tx toward the TRAU.
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3 */
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4
8
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5 #include <ctype.h>
7
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6 #include <stdint.h>
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7 #include <stdbool.h>
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <unistd.h>
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12
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13 #include <osmocom/core/select.h>
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14
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15 #include "globals.h"
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16
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17 static const uint8_t dmw_alaw[8] =
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18 {0x34, 0x21, 0x21, 0x34, 0xB4, 0xA1, 0xA1, 0xB4};
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19
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20 static uint8_t pcm_fill_octet = 0x54;
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21 static bool dmw_active;
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22 static uint8_t *play_buffer;
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23 static unsigned play_buf_nframes, play_buf_ptr;
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24
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25 static void fill_with_dmw(uint8_t *buf)
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26 {
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27 unsigned n;
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28
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29 for (n = 0; n < 20; n++) {
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30 memcpy(buf, dmw_alaw, 8);
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31 buf += 8;
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32 }
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33 }
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34
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35 static void fill_with_play(uint8_t *outbuf)
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36 {
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37 memcpy(outbuf, play_buffer + play_buf_ptr * 160, 160);
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38 play_buf_ptr++;
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39 if (play_buf_ptr < play_buf_nframes)
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40 return;
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41 free(play_buffer);
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42 play_buffer = 0;
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43 printf("file play finished\n");
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44 }
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45
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46 void transmit_pcm_20ms(void)
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47 {
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48 uint8_t buf[160];
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49
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50 if (play_buffer)
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51 fill_with_play(buf);
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52 else if (dmw_active)
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53 fill_with_dmw(buf);
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54 else
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55 memset(buf, pcm_fill_octet, 160);
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56 write(ts_fd, buf, 160);
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57 }
8
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58
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59 void cmd_pcm_fill(int argc, char **argv)
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60 {
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61 u_long val;
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62 char *cp;
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63
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64 if (argc != 2) {
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65 printf("error: pcm-fill command needs 1 argument\n");
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66 return;
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67 }
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68 if (!isxdigit(argv[1][0])) {
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69 inv_arg: printf("error: argument is not a valid hex octet\n");
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70 return;
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71 }
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72 val = strtoul(argv[1], &cp, 16);
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73 if (*cp)
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74 goto inv_arg;
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75 if (val > 0xFF)
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76 goto inv_arg;
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77 pcm_fill_octet = val;
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78 }
9
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79
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80 void cmd_dmw_on(int argc, char **argv)
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81 {
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82 dmw_active = true;
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83 }
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84
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85 void cmd_dmw_off(int argc, char **argv)
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86 {
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87 dmw_active = false;
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88 }