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annotate pcmu2efr/gen160.c @ 21:3eb407b08b4c

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pcmu2efr: confirm that we got 280 distinct outputs so far
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 May 2024 03:15:23 +0000
parents 528eef871e23
children f4420403219a
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1 /*
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2 * The code in this module generates 160 versions of linearized seqsyncu,
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3 * shifted by one sample each, intended for feeding to EFR and AMR encoders.
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4 */
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5
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6 #include <stdint.h>
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7
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8 extern const uint8_t seqsyncu_last_frame[160];
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9 extern const uint16_t pcmu_decode_table[256];
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10
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11 uint16_t linear_inputs[160][160];
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13 static void
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14 gen_first_seq(void)
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15 {
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16 unsigned n;
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17
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18 for (n = 0; n < 160; n++)
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19 linear_inputs[0][n] = pcmu_decode_table[seqsyncu_last_frame[n]];
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20 }
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21
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22 static void
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23 gen_sequence_m(unsigned m)
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24 {
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25 unsigned n, s;
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26
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27 for (n = 0; n < m; n++)
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28 linear_inputs[m][n] = 0x0008;
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29 for (s = 0; n < 160; n++, s++)
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30 linear_inputs[m][n] = linear_inputs[0][s];
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31 }
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32
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33 void
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34 generate_linear_inputs(void)
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35 {
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36 unsigned m;
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37
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38 gen_first_seq();
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39 for (m = 1; m < 160; m++)
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40 gen_sequence_m(m);
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41 }