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2
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1 /*
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2 =======================================================================
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3
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4 SHIFTBIT.C
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5 ~~~~~~~~~~
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6
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7 Description
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8 ~~~~~~~~~~~
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9
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10 Shift samples from input file (in Qx format) such that the output file
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11 will be in the Qy format, with sign extension. In fact, what this does
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12 is multiply by the factor 2**(y-x) (if left-shift) or divide by the
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13 factor 2**(x-y) (if right-shift) the input samples.
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14
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15 Includes:
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16 ~~~~~~~~~
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17 specific: ugstdemo.h
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18 system: stdio.h,stat.h
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19
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20 Author:
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21 ~~~~~~~
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22
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23 Simao Ferraz de Campos Neto
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24 DDS/Pr11 Tel: +55-192-39-1396
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25 CPqD/Telebras Fax: +55-192-53-4754
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26 13085 Campinas SP Brazil E-mail: <tdsimao@venus.cpqd.ansp.br>
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27
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28 History:
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29 ~~~~~~~~
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30 08.Feb.91 v1.0 Created!
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31
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32 =======================================================================
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33 */
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34
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35 #include "ugstdemo.h"
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36 #include <stdio.h>
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37
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38 /*
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39 * Includes dependent of the Operating System
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40 */
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41 #if defined(VMS)
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42 # include <stat.h>
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43 #elif defined (MSDOS)
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44 # include <sys\stat.h>
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45 #else
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46 # include <sys/stat.h>
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47 #endif
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48
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49 #define RIGHT 1
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50 #define LEFT -1
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51
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52 main(argc, argv)
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53 int argc;
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54 char *argv[];
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55 {
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56 char inp[50], out[50];
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57 short *buf;
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58 int qinp, qout, shift, dir;
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59 FILE *Fi, *Fo;
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60 int fi, fo;
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61 #ifdef VMS
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62 char mrs[15] = "mrs=512";
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63 #endif
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64 struct stat info;
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65 long l, k;
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66
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67 GET_PAR_S(1, "Input file: ......... ", inp);
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68 GET_PAR_I(2, "Input file is Q.", qinp);
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69 GET_PAR_S(3, "Output file: ........ ", out);
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70 GET_PAR_I(4, "Input file is Q.", qout);
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71
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72 if (qout == qinp)
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73 HARAKIRI("Makes no sense a shift of 0 ... \n", 7)
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74 else
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75 if (qout > qinp)
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76 dir = RIGHT;
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77 else
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78 dir = LEFT;
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79
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80 l = qout - qinp;
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81 if (l < 0)
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82 l = -l;
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83
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84 for (shift = 1, k = 0; k < l; k++)
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85 shift *= 2;
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86
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87 if ((Fi = fopen(inp, RB)) == NULL)
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88 KILL(inp, 2);
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89 fi = fileno(Fi);
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90 if ((Fo = fopen(out, WB)) == NULL)
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91 KILL(inp, 3);
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92 fo = fileno(Fo);
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93
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94 stat(inp, &info);
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95 if ((buf = (short *) malloc(info.st_size)) == NULL)
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96 HARAKIRI("Can't alloc inp\n", 4);
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97 l = info.st_size / 2;
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98
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99 fprintf(stderr, "%s: Reading, ", inp);
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100 for (k = 0; k < l; k += 256)
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101 if (read(fi, &buf[k], 512) < 0)
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102 KILL(inp, 5);
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103
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104 fprintf(stderr, "shifting, ");
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105 if (dir == RIGHT)
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106 for (k = 0; k < l; k++)
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107 buf[k] = (buf[k] * shift);
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108 else
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109 for (k = 0; k < l; k++)
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110 buf[k] = (buf[k] / shift);
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111
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112 fprintf(stderr, "and writing ... ");
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113 for (k = 0; k < l; k += 256)
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114 if (write(fo, &buf[k], 512) <= 0)
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115 KILL(inp, 6);
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116
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117 fprintf(stderr, "Done!\n");
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118 fclose(Fi);
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119 fclose(Fo);
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120 }
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