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199
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1 /*
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2
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3 TiMidity -- Experimental MIDI to WAVE converter
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4 Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
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5
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6 This program is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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10
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program; if not, write to the Free Software
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18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19
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20 output.c
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21
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22 Audio output (to file / device) functions.
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23 */
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24
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25 #if HAVE_CONFIG_H
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26 # include <config.h>
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27 #endif
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28
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29 #include "SDL_sound.h"
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30
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31 #define __SDL_SOUND_INTERNAL__
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32 #include "SDL_sound_internal.h"
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33
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34 #include "options.h"
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35 #include "output.h"
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36
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37 /*****************************************************************/
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38 /* Some functions to convert signed 32-bit data to other formats */
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39
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40 void s32tos8(void *dp, Sint32 *lp, Sint32 c)
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41 {
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42 Sint8 *cp=(Sint8 *)(dp);
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43 Sint32 l;
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44 while (c--)
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45 {
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46 l=(*lp++)>>(32-8-GUARD_BITS);
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47 if (l>127) l=127;
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48 else if (l<-128) l=-128;
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49 *cp++ = (Sint8) (l);
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50 }
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51 }
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52
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53 void s32tou8(void *dp, Sint32 *lp, Sint32 c)
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54 {
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55 Uint8 *cp=(Uint8 *)(dp);
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56 Sint32 l;
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57 while (c--)
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58 {
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59 l=(*lp++)>>(32-8-GUARD_BITS);
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60 if (l>127) l=127;
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61 else if (l<-128) l=-128;
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62 *cp++ = 0x80 ^ ((Uint8) l);
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63 }
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64 }
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65
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66 void s32tos16(void *dp, Sint32 *lp, Sint32 c)
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67 {
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68 Sint16 *sp=(Sint16 *)(dp);
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69 Sint32 l;
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70 while (c--)
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71 {
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72 l=(*lp++)>>(32-16-GUARD_BITS);
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73 if (l > 32767) l=32767;
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74 else if (l<-32768) l=-32768;
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75 *sp++ = (Sint16)(l);
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76 }
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77 }
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78
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79 void s32tou16(void *dp, Sint32 *lp, Sint32 c)
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80 {
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81 Uint16 *sp=(Uint16 *)(dp);
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82 Sint32 l;
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83 while (c--)
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84 {
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85 l=(*lp++)>>(32-16-GUARD_BITS);
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86 if (l > 32767) l=32767;
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87 else if (l<-32768) l=-32768;
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88 *sp++ = 0x8000 ^ (Uint16)(l);
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89 }
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90 }
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91
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92 void s32tos16x(void *dp, Sint32 *lp, Sint32 c)
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93 {
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94 Sint16 *sp=(Sint16 *)(dp);
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95 Sint32 l;
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96 while (c--)
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97 {
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98 l=(*lp++)>>(32-16-GUARD_BITS);
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99 if (l > 32767) l=32767;
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100 else if (l<-32768) l=-32768;
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101 *sp++ = SDL_Swap16((Sint16)(l));
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102 }
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103 }
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104
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105 void s32tou16x(void *dp, Sint32 *lp, Sint32 c)
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106 {
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107 Uint16 *sp=(Uint16 *)(dp);
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108 Sint32 l;
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109 while (c--)
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110 {
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111 l=(*lp++)>>(32-16-GUARD_BITS);
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112 if (l > 32767) l=32767;
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113 else if (l<-32768) l=-32768;
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114 *sp++ = SDL_Swap16(0x8000 ^ (Uint16)(l));
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115 }
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116 }
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