FreeCalypso > hg > gsm-codec-lib
annotate miscutil/pcm16-to-ulaw.c @ 242:f081a6850fb5
libgsmfrp: new refined implementation
The previous implementation exhibited the following defects,
which are now fixed:
1) The last received valid SID was cached forever for the purpose of
handling future invalid SIDs - we could have received some valid
SID ages ago, then lots of speech or NO_DATA, and if we then get
an invalid SID, we would resurrect the last valid SID from ancient
history - a bad design. In our new design, we handle invalid SID
based on the current state, much like BFI.
2) GSM 06.11 spec says clearly that after the second lost SID
(received BFI=1 && TAF=1 in CN state) we need to gradually decrease
the output level, rather than jump directly to emitting silence
frames - we previously failed to implement such logic.
3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes
in a SID frame. What should we do if we receive an otherwise valid
SID frame with different Xmaxc? Our previous approach would
replicate this Xmaxc oddity in every subsequent generated CN frame,
which is rather bad. In our new design, the very first CN frame
(which can be seen as a transformation of the SID frame itself)
retains the original 4 distinct Xmaxc, but all subsequent CN frames
are based on the Xmaxc from the last subframe of the most recent SID.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 09 May 2023 05:16:31 +0000 |
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rev | line source |
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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 |
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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 |
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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 |
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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]); |
234
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123 ins >>= 2; |
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124 if (truncate) |
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125 ins &= ~1; |
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126 putc(ulaw_compress(ins), outf); |
219
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127 } |
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128 fclose(outf); |
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129 exit(0); |
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130 } |