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annotate pcmu2efr/gen-amr-2fr.c @ 23:2628a34fe75b

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pcmu2efr: encode 2nd frame for AMR-EFR offsets 120-159
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 May 2024 04:24:15 +0000
parents pcmu2efr/gen-amrefr.c@f4420403219a
children
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1 /*
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2 * The code in this module takes linear_input_array[] from gen160.c
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3 * and generates EFR-format frames by way of libtwamr encoder.
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4 * This version does a second frame pass on offsets 120-159.
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <gsm_efr.h>
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11 #include <tw_amr.h>
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12
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13 extern uint16_t linear_input_array[480];
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15 uint8_t amr_efr[160][31];
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17 void
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18 generate_amr_efr(void)
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19 {
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20 struct amr_encoder_state *st;
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21 struct amr_param_frame amr_frame;
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22 unsigned m;
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23
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24 st = amr_encoder_create(0, 0);
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25 if (!st) {
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26 fprintf(stderr, "error: amr_encoder_create() failed\n");
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27 exit(1);
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28 }
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29 for (m = 0; m < 160; m++) {
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30 amr_encoder_reset(st, 0, 0);
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31 amr_encode_frame(st, MR122,
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32 (const int16_t *) linear_input_array + 160 - m,
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33 &amr_frame);
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34 if (m >= 120) {
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35 amr_encode_frame(st, MR122,
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36 (const int16_t *) linear_input_array + 320 - m,
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37 &amr_frame);
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38 }
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39 EFR_params2frame(amr_frame.param, amr_efr[m]);
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40 }
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41 free(st);
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42 }