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annotate efrtest/tidsp.c @ 256:a33edf624061

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libgsmfr2: start with API definition and port of libgsmfrp code
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Apr 2024 20:49:53 +0000
parents 5efc377326da
children
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1 /*
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2 * The utility function implemented in this module extracts a 244-bit EFR
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3 * codec frame from a 33-byte readout of Calypso DSP buffer, and presents
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4 * this frame in the RTP encoding format of ETSI TS 101 318.
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5 */
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6
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7 #include <stdint.h>
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8
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9 static const uint16_t efr_to_tidsp_table[244] = {
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10 50, 24, 25, 37, 38, 43, 44, 26, 42, 27, 39, 40,
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11 45, 51, 52, 41, 46, 28, 29, 47, 53, 77, 78, 30,
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12 54, 55, 79, 56, 80, 109, 110, 111, 112, 113, 114, 115,
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13 180, 181, 0, 1, 2, 3, 4, 5, 20, 31, 32, 16,
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14 73, 105, 157, 81, 118, 138, 165, 82, 119, 139, 166, 83,
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15 120, 140, 167, 84, 121, 141, 168, 85, 122, 186, 200, 204,
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16 224, 244, 205, 225, 245, 206, 226, 246, 207, 227, 247, 208,
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17 228, 248, 17, 61, 101, 153, 161, 12, 13, 22, 35, 48,
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18 116, 18, 74, 106, 158, 86, 123, 142, 169, 87, 124, 143,
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19 170, 88, 125, 144, 171, 89, 126, 145, 172, 90, 127, 189,
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20 201, 209, 229, 249, 210, 230, 250, 211, 231, 251, 212, 232,
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21 252, 213, 233, 253, 19, 62, 102, 154, 162, 6, 7, 8,
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22 9, 10, 11, 21, 33, 34, 57, 75, 107, 159, 91, 128,
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23 146, 173, 92, 129, 147, 174, 93, 130, 148, 175, 94, 131,
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24 149, 176, 95, 132, 192, 202, 214, 234, 254, 215, 235, 255,
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25 216, 236, 256, 217, 237, 257, 218, 238, 258, 59, 63, 103,
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26 155, 163, 14, 15, 23, 36, 49, 117, 58, 76, 108, 160,
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27 96, 133, 150, 177, 97, 134, 198, 199, 98, 135, 151, 178,
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28 99, 136, 152, 179, 100, 137, 195, 203, 219, 239, 259, 220,
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29 240, 260, 221, 241, 261, 222, 242, 262, 223, 243, 263, 60,
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30 64, 104, 156, 164
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31 };
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32
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33 static int
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34 msb_get_bit(buf, bn)
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35 uint8_t *buf;
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36 {
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37 int pos_byte = bn >> 3;
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38 int pos_bit = 7 - (bn & 7);
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39
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40 return (buf[pos_byte] >> pos_bit) & 1;
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41 }
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42
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43 static void
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44 msb_set_bit(buf, bn, bit)
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45 uint8_t *buf;
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46 {
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47 int pos_byte = bn >> 3;
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48 int pos_bit = 7 - (bn & 7);
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49
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50 if (bit)
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51 buf[pos_byte] |= (1 << pos_bit);
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52 else
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53 buf[pos_byte] &= ~(1 << pos_bit);
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54 }
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55
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56 void
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57 efr_tidsp_to_std(inbytes, outbytes)
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58 uint8_t *inbytes, *outbytes;
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59 {
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60 int i, si;
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61
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62 outbytes[0] = 0xC0;
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63 for (i = 0; i < 244; i++) {
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64 si = efr_to_tidsp_table[i];
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65 msb_set_bit(outbytes, i + 4, msb_get_bit(inbytes, si));
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66 }
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67 }