annotate src/audio/SDL_mixer.c @ 297:f6ffac90895c

Updated copyright information for 2002
author Sam Lantinga <slouken@libsdl.org>
date Wed, 06 Mar 2002 11:23:08 +0000
parents e8157fcb3114
children a9e38f3b8e4d
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* This provides the default mixing callback for the SDL audio routines */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 #include "SDL_audio.h"
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35 #include "SDL_mutex.h"
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36 #include "SDL_timer.h"
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37 #include "SDL_sysaudio.h"
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38
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39
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40 /* This table is used to add two sound values together and pin
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41 * the value to avoid overflow. (used with permission from ARDI)
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42 * Changed to use 0xFE instead of 0xFF for better sound quality.
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43 */
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44 static const Uint8 mix8[] =
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45 {
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46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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49 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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51 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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52 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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53 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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54 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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55 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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57 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
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58 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
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59 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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60 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24,
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61 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
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62 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,
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63 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
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64 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
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65 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B,
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66 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
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67 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
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68 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,
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69 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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70 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92,
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71 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D,
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72 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,
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73 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3,
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74 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE,
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75 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9,
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76 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4,
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77 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
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78 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
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79 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5,
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80 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE,
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81 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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82 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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83 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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84 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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85 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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86 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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87 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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88 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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89 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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90 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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91 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
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92 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE
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93 };
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94
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95 /* The volume ranges from 0 - 128 */
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96 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME)
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97 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128)
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98
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99 void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume)
0
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100 {
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101 Uint16 format;
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102
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103 if ( volume == 0 ) {
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104 return;
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105 }
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106 /* Mix the user-level audio format */
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107 if ( current_audio ) {
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108 if ( current_audio->convert.needed ) {
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109 format = current_audio->convert.src_format;
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110 } else {
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111 format = current_audio->spec.format;
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112 }
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113 } else {
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114 /* HACK HACK HACK */
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115 format = AUDIO_S16;
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116 }
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117 switch (format) {
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118
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119 case AUDIO_U8: {
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120 Uint8 src_sample;
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121
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122 while ( len-- ) {
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123 src_sample = *src;
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124 ADJUST_VOLUME_U8(src_sample, volume);
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125 *dst = mix8[*dst+src_sample];
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126 ++dst;
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127 ++src;
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128 }
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129 }
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130 break;
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131
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132 case AUDIO_S8: {
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133 Sint8 *dst8, *src8;
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134 Sint8 src_sample;
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135 int dst_sample;
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136 const int max_audioval = ((1<<(8-1))-1);
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137 const int min_audioval = -(1<<(8-1));
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138
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139 src8 = (Sint8 *)src;
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140 dst8 = (Sint8 *)dst;
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141 while ( len-- ) {
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142 src_sample = *src8;
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143 ADJUST_VOLUME(src_sample, volume);
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144 dst_sample = *dst8 + src_sample;
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145 if ( dst_sample > max_audioval ) {
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146 *dst8 = max_audioval;
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147 } else
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148 if ( dst_sample < min_audioval ) {
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149 *dst8 = min_audioval;
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150 } else {
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151 *dst8 = dst_sample;
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152 }
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153 ++dst8;
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154 ++src8;
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155 }
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156 }
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157 break;
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158
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159 case AUDIO_S16LSB: {
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160 Sint16 src1, src2;
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161 int dst_sample;
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162 const int max_audioval = ((1<<(16-1))-1);
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163 const int min_audioval = -(1<<(16-1));
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164
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165 len /= 2;
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166 while ( len-- ) {
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167 src1 = ((src[1])<<8|src[0]);
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168 ADJUST_VOLUME(src1, volume);
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169 src2 = ((dst[1])<<8|dst[0]);
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170 src += 2;
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171 dst_sample = src1+src2;
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172 if ( dst_sample > max_audioval ) {
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173 dst_sample = max_audioval;
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174 } else
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175 if ( dst_sample < min_audioval ) {
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176 dst_sample = min_audioval;
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177 }
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178 dst[0] = dst_sample&0xFF;
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179 dst_sample >>= 8;
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180 dst[1] = dst_sample&0xFF;
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181 dst += 2;
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182 }
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183 }
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184 break;
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185
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186 case AUDIO_S16MSB: {
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187 Sint16 src1, src2;
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188 int dst_sample;
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189 const int max_audioval = ((1<<(16-1))-1);
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190 const int min_audioval = -(1<<(16-1));
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191
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192 len /= 2;
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193 while ( len-- ) {
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194 src1 = ((src[0])<<8|src[1]);
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195 ADJUST_VOLUME(src1, volume);
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196 src2 = ((dst[0])<<8|dst[1]);
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197 src += 2;
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198 dst_sample = src1+src2;
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199 if ( dst_sample > max_audioval ) {
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200 dst_sample = max_audioval;
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201 } else
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202 if ( dst_sample < min_audioval ) {
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203 dst_sample = min_audioval;
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parents:
diff changeset
204 }
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205 dst[1] = dst_sample&0xFF;
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206 dst_sample >>= 8;
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diff changeset
207 dst[0] = dst_sample&0xFF;
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208 dst += 2;
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diff changeset
209 }
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parents:
diff changeset
210 }
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parents:
diff changeset
211 break;
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parents:
diff changeset
212
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213 default: /* If this happens... FIXME! */
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214 SDL_SetError("SDL_MixAudio(): unknown audio format");
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diff changeset
215 return;
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parents:
diff changeset
216 }
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diff changeset
217 }