FreeCalypso > hg > gsm-codec-lib

annotate miscutil/pcm16-to-ulaw.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents c7f02428bda6
children
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1 /*
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2 * This program reads a 16-bit PCM recording in raw format (robe by default,
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3 * or LE with -l option) and converts it to 8-bit PCM in North American
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4 * mu-law encoding. It is based on the ulaw_compress() function from ITU-T
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5 * G.191 STL, using the most significant 14 bits of each input linear PCM
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6 * sample, rather than just 13. A command line option is also provided
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7 * to truncate each input value to 13 bits prior to mu-law encoding, to
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8 * replicate the effect of using a table lookup conversion method that
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9 * only considers the upper 13 bits - specify -t option to select this mode.
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10 */
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11
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12 #include <stdio.h>
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13 #include <stdint.h>
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14 #include <stdlib.h>
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15 #include <string.h>
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16 #include <strings.h>
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17 #include <unistd.h>
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18
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19 static unsigned
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20 ulaw_compress(input)
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21 unsigned input;
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22 {
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23 short i; /* aux.var. */
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24 short absno; /* absolute value of linear (input) sample */
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25 short segno; /* segment (Table 2/G711, column 1) */
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26 short low_nibble; /* low nibble of log companded sample */
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27 short high_nibble; /* high nibble of log companded sample */
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28 unsigned output;
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29
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30 /* -------------------------------------------------------------------- */
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31 /* Input is 14-bit right-justified in this version */
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32 /* Compute absolute value; adjust for easy processing */
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33 /* -------------------------------------------------------------------- */
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34 absno = input >= 0x2000 /* compute 1's complement in case of */
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35 ? (~input & 0x1FFF) + 33 /* negative samples */
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36 : input + 33; /* NB: 33 is the difference value */
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37 /* between the thresholds for */
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38 /* A-law and u-law. */
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39 if (absno > (0x1FFF)) /* limitation to "absno" < 8192 */
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40 absno = (0x1FFF);
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41
229
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42 /* Determination of sample's segment */
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43 i = absno >> 6;
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44 segno = 1;
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45 while (i != 0) {
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46 segno++;
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47 i >>= 1;
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48 }
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49
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50 /* Mounting the high-nibble of the log-PCM sample */
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51 high_nibble = (0x0008) - segno;
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52
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53 /* Mounting the low-nibble of the log PCM sample */
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54 low_nibble = (absno >> segno) /* right shift of mantissa and */
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55 &(0x000F); /* masking away leading '1' */
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56 low_nibble = (0x000F) - low_nibble;
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57
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58 /* Joining the high-nibble and the low-nibble of the log PCM sample */
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59 output = (high_nibble << 4) | low_nibble;
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60
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61 /* Add sign bit */
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62 if (input < 0x2000)
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63 output = output | (0x0080);
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64
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65 return output;
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66 }
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67
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68 main(argc, argv)
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69 char **argv;
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70 {
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71 int opt, little_endian = 0, truncate = 0;
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72 char *infname, *outfname;
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73 FILE *inf, *outf;
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74 uint8_t inb[2];
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75 uint16_t ins;
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76 int cc;
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77 extern int optind;
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78
234
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79 while ((opt = getopt(argc, argv, "lt")) != EOF) {
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80 switch (opt) {
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81 case 'l':
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82 little_endian = 1;
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83 continue;
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84 case 't':
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85 truncate = 1;
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86 continue;
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87 default:
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88 usage:
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89 fprintf(stderr,
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90 "usage: %s [-l] [-t] input.pcm16 output.ulaw\n",
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91 argv[0]);
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92 exit(1);
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93 }
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94 }
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95 if (argc != optind + 2)
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96 goto usage;
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97 infname = argv[optind];
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98 outfname = argv[optind+1];
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99
219
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100 inf = fopen(infname, "r");
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101 if (!inf) {
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102 perror(infname);
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103 exit(1);
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104 }
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105 outf = fopen(outfname, "w");
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106 if (!outf) {
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107 perror(outfname);
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108 exit(1);
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109 }
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110 for (;;) {
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111 cc = fread(inb, 1, 2, inf);
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112 if (cc <= 0)
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113 break;
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114 if (cc & 1) {
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115 fprintf(stderr, "error: %s has odd number of bytes\n",
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116 infname);
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117 exit(1);
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118 }
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119 if (little_endian)
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120 ins = ((uint16_t) inb[1] << 8) | ((uint16_t) inb[0]);
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121 else
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122 ins = ((uint16_t) inb[0] << 8) | ((uint16_t) inb[1]);
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123 ins >>= 2;
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124 if (truncate)
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diff changeset
125 ins &= ~1;
c7f02428bda6 pcm16-to-ulaw: add -t option for 13-bit mode
Mychaela Falconia <falcon@freecalypso.org>
parents: 231
diff changeset
126 putc(ulaw_compress(ins), outf);
219
dc52c3857bf7 miscutil: new program pcm16-to-alaw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 }
dc52c3857bf7 miscutil: new program pcm16-to-alaw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 fclose(outf);
dc52c3857bf7 miscutil: new program pcm16-to-alaw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 exit(0);
dc52c3857bf7 miscutil: new program pcm16-to-alaw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 }