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annotate amrefr/decode-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 65d20172e92a
children
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1 /*
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2 * amrefr-decode-r is a counterpart to gsmefr-decode-r, implementing
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3 * "alternative EFR" by way of libtwamr. Unlike standard gsmefr-decode-r,
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4 * this version cannot handle SID frames in input: they are not explicitly
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5 * checked for, but an input containing SIDs will not be decoded correctly.
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6 */
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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 "../libgsmefr/gsm_efr.h"
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12 #include "../libtwamr/tw_amr.h"
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13 #include "../libtest/binreader.h"
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14 #include "../libtest/robewrite.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 *binf, *outf;
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20 struct amr_decoder_state *state;
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21 uint8_t frame[BINFILE_MAX_FRAME];
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22 struct amr_param_frame amr_frame;
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23 int16_t pcm[160];
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24 int rc, bfi;
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26 if (argc != 3) {
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27 fprintf(stderr, "usage: %s input.gsmx output.robe\n", argv[0]);
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28 exit(1);
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29 }
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30 binf = fopen(argv[1], "r");
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31 if (!binf) {
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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 outf = fopen(argv[2], "w");
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36 if (!outf) {
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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_decoder_create();
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41 if (!state) {
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42 perror("amr_decoder_create()");
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43 exit(1);
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44 }
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45 amr_frame.mode = 0x87;
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46 for (;;) {
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47 rc = binfile_read_frame(binf, frame);
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48 if (rc < 0) {
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49 fprintf(stderr, "error: garbage in %s\n", argv[1]);
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50 exit(1);
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51 }
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52 if (!rc)
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53 break;
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54 if (frame[0] == 0xBF)
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55 bfi = 1;
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56 else if ((frame[0] & 0xF0) == 0xC0)
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57 bfi = 0;
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58 else {
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59 fprintf(stderr,
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60 "error: %s is not in EFR codec format\n",
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61 argv[1]);
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62 exit(1);
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63 }
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64 if (bfi)
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65 amr_frame.type = RX_NO_DATA;
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66 else {
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67 amr_frame.type = RX_SPEECH_GOOD;
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68 EFR_frame2params(frame, amr_frame.param);
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69 }
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70 amr_decode_frame(state, &amr_frame, pcm);
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71 write_pcm_to_robe(outf, pcm);
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72 }
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73 fclose(outf);
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74 exit(0);
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75 }