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annotate amrefr/encode-r.c @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 0c4e1bc06740
children
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1 /*
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2 * amrefr-encode-r is a counterpart to gsmefr-encode-r, implementing
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3 * "alternative EFR" by way of libtwamr. Unlike standard gsmefr-encode-r,
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4 * there is no -d option and no DTX support in this version.
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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 <string.h>
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11 #include <strings.h>
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12 #include "../libgsmefr/gsm_efr.h"
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13 #include "../libtwamr/tw_amr.h"
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14 #include "../libtest/roberead.h"
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16 main(argc, argv)
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17 char **argv;
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18 {
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19 FILE *inf, *binf;
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20 struct amr_encoder_state *state;
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21 int16_t pcm[160];
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22 struct amr_param_frame amr_frame;
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23 uint8_t efr_frame[EFR_RTP_FRAME_LEN];
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24 int rc;
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25
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26 if (argc != 3) {
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27 fprintf(stderr, "usage: %s input.robe output.gsmx\n", argv[0]);
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28 exit(1);
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29 }
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30 inf = fopen(argv[1], "r");
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31 if (!inf) {
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32 perror(argv[1]);
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33 exit(1);
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34 }
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35 binf = fopen(argv[2], "w");
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36 if (!binf) {
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37 perror(argv[2]);
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38 exit(1);
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39 }
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40 state = amr_encoder_create(0, 0);
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41 if (!state) {
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42 perror("amr_encoder_create()");
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43 exit(1);
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44 }
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45 for (;;) {
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46 rc = robe_get_pcm_block(inf, pcm);
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47 if (!rc)
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48 break;
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49 amr_encode_frame(state, MR122, pcm, &amr_frame);
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50 amr_dhf_subst_efr2(&amr_frame, pcm);
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51 EFR_params2frame(amr_frame.param, efr_frame);
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52 fwrite(efr_frame, 1, sizeof efr_frame, binf);
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53 }
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54 fclose(binf);
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55 exit(0);
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56 }