FreeCalypso > hg > gsm-codec-lib

annotate dev/efr-sid-insert.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 3b5958f28a40
children
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1 /*
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2 * We need to implement a function that inserts the 95 bit wide SID
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3 * codeword into the frame, and we would like to do it more efficiently
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4 * than calling a "set bit" function for each of the 95 bits. This
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5 * program will produce a more efficient solution.
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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13 static const uint8_t SID_codeword_bit_idx[95] =
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14 {
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15 45, 46, 48, 49, 50, 51, 52, 53, 54, 55,
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16 56, 57, 58, 59, 60, 61, 62, 63, 64, 65,
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17 66, 67, 68, 94, 95, 96, 98, 99, 100, 101,
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24 217, 218, 219, 220, 221
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25 };
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27 static void set_bit(uint8_t *frame, unsigned bitnum)
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28 {
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29 unsigned bytenum = bitnum >> 3;
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30 unsigned bit_in_byte = 7 - (bitnum & 7);
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31 unsigned bitmask = 1 << bit_in_byte;
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32
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33 frame[bytenum] |= bitmask;
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34 }
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36 main(argc, argv)
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37 char **argv;
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38 {
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39 uint8_t bytes[31];
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40 unsigned n;
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41
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42 memset(bytes, 0, 31);
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43 for (n = 0; n < 95; n++)
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44 set_bit(bytes, SID_codeword_bit_idx[n] + 4);
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45 for (n = 0; n < 31; n++)
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46 if (bytes[n])
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47 printf("\tframe[%u] |= 0x%02X;\n", n, bytes[n]);
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48 exit(0);
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49 }