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annotate pcm/pcm_tx.c @ 7:ca351324187a

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pcm: implement Tx on the E1 timeslot
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 23 Jun 2024 19:21:00 +0000
parents
children 70aa8cbdbde9
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7
ca351324187a pcm: implement Tx on the E1 timeslot
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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
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5 #include <stdint.h>
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6 #include <stdbool.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <unistd.h>
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11
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12 #include <osmocom/core/select.h>
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13
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14 #include "globals.h"
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15
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16 static const uint8_t dmw_alaw[8] =
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17 {0x34, 0x21, 0x21, 0x34, 0xB4, 0xA1, 0xA1, 0xB4};
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18
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19 static uint8_t pcm_fill_octet = 0x54;
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20 static bool dmw_active;
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21 static uint8_t *play_buffer;
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22 static unsigned play_buf_nframes, play_buf_ptr;
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23
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24 static void fill_with_dmw(uint8_t *buf)
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25 {
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26 unsigned n;
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27
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28 for (n = 0; n < 20; n++) {
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29 memcpy(buf, dmw_alaw, 8);
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30 buf += 8;
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31 }
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32 }
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33
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34 static void fill_with_play(uint8_t *outbuf)
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35 {
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36 memcpy(outbuf, play_buffer + play_buf_ptr * 160, 160);
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37 play_buf_ptr++;
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38 if (play_buf_ptr < play_buf_nframes)
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39 return;
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40 free(play_buffer);
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41 play_buffer = 0;
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42 printf("file play finished\n");
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43 }
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44
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45 void transmit_pcm_20ms(void)
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46 {
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47 uint8_t buf[160];
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48
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49 if (play_buffer)
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50 fill_with_play(buf);
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51 else if (dmw_active)
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52 fill_with_dmw(buf);
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53 else
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54 memset(buf, pcm_fill_octet, 160);
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55 write(ts_fd, buf, 160);
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56 }