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annotate amrtest/encode.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 526a7f0e027d
children
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1 /*
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2 * twamr-encode is a speech encoder utility going from WAV input
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3 * to RFC 4867 storage format (.amr) output. It logically replaces
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4 * amrnb-enc from opencore-amr package, but its command line structure
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5 * for specifying AMR modes follows that of twamr-tseq-enc.
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6 */
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7
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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 <string.h>
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12 #include <strings.h>
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13 #include <unistd.h>
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14 #include "../libtwamr/tw_amr.h"
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15 #include "../libtest/wavreader.h"
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16 #include "../libtest/wavrdhelp.h"
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17
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18 main(argc, argv)
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19 char **argv;
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20 {
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21 char *infname, *outfname, *mode_arg;
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22 void *wav;
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23 FILE *outf;
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24 struct amr_encoder_state *state;
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25 enum Mode mode_val;
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26 int16_t pcm[160];
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27 struct amr_param_frame frame;
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28 uint8_t out_bytes[AMR_IETF_MAX_PL];
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29 int opt, dtx = 0, vad2 = 0, use_mode_file = 0, rc;
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30 unsigned nbytes;
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31 extern int optind;
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32
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33 while ((opt = getopt(argc, argv, "d2")) != EOF) {
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34 switch (opt) {
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35 case 'd':
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36 dtx = 1;
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37 continue;
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38 case '2':
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39 vad2 = 1;
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40 continue;
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41 default:
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42 usage:
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43 fprintf(stderr,
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44 "usage: %s [-d] [-2] input.wav mode output.amr\n",
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45 argv[0]);
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46 exit(1);
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47 }
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48 }
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49 if (argc != optind + 3)
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50 goto usage;
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51 infname = argv[optind];
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52 mode_arg = argv[optind+1];
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53 outfname = argv[optind+2];
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54
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55 wav = wav_read_open(infname);
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56 if (!wav) {
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57 perror(infname);
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58 exit(1);
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59 }
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60 rc = wavrd_check_header(wav, infname);
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61 if (rc < 0)
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62 exit(1); /* error msg already printed */
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63 if (!strncmp(mode_arg, "file:", 5)) {
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64 open_mode_file(mode_arg + 5);
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65 use_mode_file = 1;
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66 } else {
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67 rc = grok_mode_name(mode_arg, &mode_val);
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68 if (rc < 0) {
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69 fprintf(stderr, "error: invalid mode argument \"%s\"\n",
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70 mode_arg);
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71 exit(1);
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72 }
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73 }
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74 outf = fopen(outfname, "w");
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75 if (!outf) {
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76 perror(outfname);
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77 exit(1);
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78 }
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79 state = amr_encoder_create(dtx, vad2);
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80 if (!state) {
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81 perror("amr_encoder_create()");
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82 exit(1);
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83 }
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84 fwrite(amr_file_header_magic, 1, AMR_IETF_HDR_LEN, outf);
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85 for (;;) {
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86 rc = wavrd_get_pcm_block(wav, pcm);
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87 if (!rc)
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88 break;
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89 if (use_mode_file)
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90 read_mode_file_line(&mode_val);
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91 amr_encode_frame(state, mode_val, pcm, &frame);
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92 nbytes = amr_frame_to_ietf(&frame, out_bytes);
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93 fwrite(out_bytes, 1, nbytes, outf);
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94 }
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95 fclose(outf);
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96 exit(0);
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97 }