Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer.c @ 2349:0381047f2210 gsoc2008_iphone
The class SDL_uikitappdelegate acts as the UIApplicationDelegate for an iPhone SDL project. This class is reponsible for application control flow, including initial setup of working directory, forwarding command line arguments to the user's main function, and handling application termination.
author | Holmes Futrell <hfutrell@umail.ucsb.edu> |
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date | Thu, 17 Jul 2008 22:29:37 +0000 |
parents | 3ee59c43d784 |
children | 99210400e8b9 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
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 Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* This provides the default mixing callback for the SDL audio routines */ | |
25 | |
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26 #include "SDL_cpuinfo.h" |
0 | 27 #include "SDL_timer.h" |
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28 #include "SDL_audio.h" |
0 | 29 #include "SDL_sysaudio.h" |
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30 #include "SDL_mixer_MMX.h" |
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31 #include "SDL_mixer_MMX_VC.h" |
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32 #include "SDL_mixer_m68k.h" |
0 | 33 |
34 /* This table is used to add two sound values together and pin | |
35 * the value to avoid overflow. (used with permission from ARDI) | |
36 * Changed to use 0xFE instead of 0xFF for better sound quality. | |
37 */ | |
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38 static const Uint8 mix8[] = { |
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39 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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40 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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41 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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42 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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43 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
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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, 0x01, 0x02, 0x03, |
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51 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, |
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52 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, |
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53 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, |
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54 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, |
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55 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, |
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56 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, |
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57 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, |
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58 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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59 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, |
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60 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, |
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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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61 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, |
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62 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
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63 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, |
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64 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, |
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65 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, |
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66 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, |
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67 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, |
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68 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, |
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69 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, |
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70 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, |
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71 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, |
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72 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, |
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73 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE, |
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74 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
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75 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
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76 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
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77 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
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78 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
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79 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, |
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80 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 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 |
0 | 86 }; |
87 | |
88 /* The volume ranges from 0 - 128 */ | |
89 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME) | |
90 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128) | |
91 | |
1982
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92 |
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93 void |
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94 SDL_MixAudioFormat(Uint8 * dst, const Uint8 * src, SDL_AudioFormat format, |
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95 Uint32 len, int volume) |
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96 { |
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97 if (volume == 0) { |
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98 return; |
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99 } |
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100 |
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101 switch (format) { |
0 | 102 |
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103 case AUDIO_U8: |
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104 { |
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105 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) |
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106 SDL_MixAudio_m68k_U8((char *) dst, (char *) src, |
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107 (unsigned long) len, (long) volume, |
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108 (char *) mix8); |
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109 #else |
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110 Uint8 src_sample; |
0 | 111 |
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112 while (len--) { |
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113 src_sample = *src; |
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114 ADJUST_VOLUME_U8(src_sample, volume); |
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115 *dst = mix8[*dst + src_sample]; |
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116 ++dst; |
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117 ++src; |
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118 } |
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119 #endif |
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120 } |
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121 break; |
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123 case AUDIO_S8: |
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124 { |
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125 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) |
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126 if (SDL_HasMMX()) { |
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127 SDL_MixAudio_MMX_S8((char *) dst, (char *) src, |
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128 (unsigned int) len, (int) volume); |
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129 } else |
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130 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) |
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131 if (SDL_HasMMX()) { |
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132 SDL_MixAudio_MMX_S8_VC((char *) dst, (char *) src, |
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133 (unsigned int) len, (int) volume); |
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134 } else |
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135 #endif |
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136 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) |
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137 SDL_MixAudio_m68k_S8((char *) dst, (char *) src, |
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138 (unsigned long) len, (long) volume); |
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139 #else |
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140 { |
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141 Sint8 *dst8, *src8; |
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142 Sint8 src_sample; |
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143 int dst_sample; |
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144 const int max_audioval = ((1 << (8 - 1)) - 1); |
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145 const int min_audioval = -(1 << (8 - 1)); |
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147 src8 = (Sint8 *) src; |
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148 dst8 = (Sint8 *) dst; |
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149 while (len--) { |
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150 src_sample = *src8; |
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151 ADJUST_VOLUME(src_sample, volume); |
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152 dst_sample = *dst8 + src_sample; |
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153 if (dst_sample > max_audioval) { |
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154 *dst8 = max_audioval; |
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155 } else if (dst_sample < min_audioval) { |
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156 *dst8 = min_audioval; |
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157 } else { |
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158 *dst8 = dst_sample; |
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159 } |
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160 ++dst8; |
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161 ++src8; |
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162 } |
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163 } |
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164 #endif |
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165 } |
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166 break; |
0 | 167 |
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168 case AUDIO_S16LSB: |
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169 { |
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170 #if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) |
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171 if (SDL_HasMMX()) { |
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172 SDL_MixAudio_MMX_S16((char *) dst, (char *) src, |
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173 (unsigned int) len, (int) volume); |
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174 } else |
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175 #elif ((defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)) && defined(SDL_ASSEMBLY_ROUTINES) |
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176 if (SDL_HasMMX()) { |
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177 SDL_MixAudio_MMX_S16_VC((char *) dst, (char *) src, |
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178 (unsigned int) len, (int) volume); |
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179 } else |
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180 #endif |
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181 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) |
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182 SDL_MixAudio_m68k_S16LSB((short *) dst, (short *) src, |
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183 (unsigned long) len, (long) volume); |
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184 #else |
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185 { |
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186 Sint16 src1, src2; |
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187 int dst_sample; |
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188 const int max_audioval = ((1 << (16 - 1)) - 1); |
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189 const int min_audioval = -(1 << (16 - 1)); |
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191 len /= 2; |
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192 while (len--) { |
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193 src1 = ((src[1]) << 8 | src[0]); |
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194 ADJUST_VOLUME(src1, volume); |
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195 src2 = ((dst[1]) << 8 | dst[0]); |
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196 src += 2; |
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197 dst_sample = src1 + src2; |
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198 if (dst_sample > max_audioval) { |
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199 dst_sample = max_audioval; |
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200 } else if (dst_sample < min_audioval) { |
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201 dst_sample = min_audioval; |
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202 } |
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203 dst[0] = dst_sample & 0xFF; |
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204 dst_sample >>= 8; |
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205 dst[1] = dst_sample & 0xFF; |
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206 dst += 2; |
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207 } |
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208 } |
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209 #endif |
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210 } |
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211 break; |
0 | 212 |
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213 case AUDIO_S16MSB: |
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214 { |
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215 #if defined(__GNUC__) && defined(__M68000__) && defined(SDL_ASSEMBLY_ROUTINES) |
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216 SDL_MixAudio_m68k_S16MSB((short *) dst, (short *) src, |
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217 (unsigned long) len, (long) volume); |
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218 #else |
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219 Sint16 src1, src2; |
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220 int dst_sample; |
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221 const int max_audioval = ((1 << (16 - 1)) - 1); |
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222 const int min_audioval = -(1 << (16 - 1)); |
0 | 223 |
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224 len /= 2; |
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225 while (len--) { |
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226 src1 = ((src[0]) << 8 | src[1]); |
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227 ADJUST_VOLUME(src1, volume); |
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228 src2 = ((dst[0]) << 8 | dst[1]); |
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229 src += 2; |
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230 dst_sample = src1 + src2; |
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231 if (dst_sample > max_audioval) { |
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232 dst_sample = max_audioval; |
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233 } else if (dst_sample < min_audioval) { |
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234 dst_sample = min_audioval; |
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235 } |
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236 dst[1] = dst_sample & 0xFF; |
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237 dst_sample >>= 8; |
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238 dst[0] = dst_sample & 0xFF; |
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239 dst += 2; |
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240 } |
633
873c2598f969
Add m68k assembly mixing routines
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241 #endif |
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242 } |
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243 break; |
0 | 244 |
1982
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245 case AUDIO_S32LSB: |
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246 { |
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247 const Uint32 *src32 = (Uint32 *) src; |
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248 Uint32 *dst32 = (Uint32 *) dst; |
2013
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Fixed S32 audio mixing, but I'm a bit nervous about the use of 64-bit
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249 Sint64 src1, src2; |
1982
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250 Sint64 dst_sample; |
1985
8055185ae4ed
Added source color and alpha modulation support.
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1982
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251 const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); |
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Added source color and alpha modulation support.
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252 const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); |
1982
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253 |
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254 len /= 4; |
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255 while (len--) { |
2013
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1985
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256 src1 = (Sint64) ((Sint32) SDL_SwapLE32(*src32)); |
1982
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257 src32++; |
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258 ADJUST_VOLUME(src1, volume); |
2013
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259 src2 = (Sint64) ((Sint32) SDL_SwapLE32(*dst32)); |
1982
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260 dst_sample = src1 + src2; |
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261 if (dst_sample > max_audioval) { |
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262 dst_sample = max_audioval; |
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263 } else if (dst_sample < min_audioval) { |
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264 dst_sample = min_audioval; |
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265 } |
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266 *(dst32++) = SDL_SwapLE32((Uint32) ((Sint32) dst_sample)); |
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267 } |
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268 } |
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269 break; |
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270 |
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271 case AUDIO_S32MSB: |
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272 { |
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273 const Uint32 *src32 = (Uint32 *) src; |
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274 Uint32 *dst32 = (Uint32 *) dst; |
2013
0615fa58c0be
Fixed S32 audio mixing, but I'm a bit nervous about the use of 64-bit
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1985
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275 Sint64 src1, src2; |
1982
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|
276 Sint64 dst_sample; |
1985
8055185ae4ed
Added source color and alpha modulation support.
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parents:
1982
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|
277 const Sint64 max_audioval = ((((Sint64) 1) << (32 - 1)) - 1); |
8055185ae4ed
Added source color and alpha modulation support.
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parents:
1982
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|
278 const Sint64 min_audioval = -(((Sint64) 1) << (32 - 1)); |
1982
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279 |
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280 len /= 4; |
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|
281 while (len--) { |
2013
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Fixed S32 audio mixing, but I'm a bit nervous about the use of 64-bit
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1985
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|
282 src1 = (Sint64) ((Sint32) SDL_SwapBE32(*src32)); |
1982
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|
283 src32++; |
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|
284 ADJUST_VOLUME(src1, volume); |
2013
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Fixed S32 audio mixing, but I'm a bit nervous about the use of 64-bit
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parents:
1985
diff
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|
285 src2 = (Sint64) ((Sint32) SDL_SwapBE32(*dst32)); |
1982
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|
286 dst_sample = src1 + src2; |
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287 if (dst_sample > max_audioval) { |
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|
288 dst_sample = max_audioval; |
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289 } else if (dst_sample < min_audioval) { |
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|
290 dst_sample = min_audioval; |
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|
291 } |
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|
292 *(dst32++) = SDL_SwapBE32((Uint32) ((Sint32) dst_sample)); |
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|
293 } |
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|
294 } |
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|
295 break; |
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|
296 |
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|
297 case AUDIO_F32LSB: |
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|
298 { |
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|
299 const float fmaxvolume = 1.0f / ((float) SDL_MIX_MAXVOLUME); |
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300 const float fvolume = (float) volume; |
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|
301 const float *src32 = (float *) src; |
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|
302 float *dst32 = (float *) dst; |
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303 float src1, src2; |
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|
304 double dst_sample; |
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|
305 /* !!! FIXME: are these right? */ |
2130
3ee59c43d784
Fixes for compiling with Visual C++ 8.0 Express Edition
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parents:
2049
diff
changeset
|
306 const double max_audioval = 3.402823466e+38F; |
3ee59c43d784
Fixes for compiling with Visual C++ 8.0 Express Edition
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parents:
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changeset
|
307 const double min_audioval = -3.402823466e+38F; |
1982
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|
308 |
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|
309 len /= 4; |
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|
310 while (len--) { |
2014
7abe37467fa5
Replaced unions with calls to SDL_SwapFloat...
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parents:
2013
diff
changeset
|
311 src1 = ((SDL_SwapFloatLE(*src32) * fvolume) * fmaxvolume); |
7abe37467fa5
Replaced unions with calls to SDL_SwapFloat...
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parents:
2013
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|
312 src2 = SDL_SwapFloatLE(*dst32); |
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parents:
2013
diff
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|
313 src32++; |
1982
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First shot at new audio data types (int32 and float32).
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|
314 |
2014
7abe37467fa5
Replaced unions with calls to SDL_SwapFloat...
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parents:
2013
diff
changeset
|
315 dst_sample = ((double) src1) + ((double) src2); |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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|
316 if (dst_sample > max_audioval) { |
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|
317 dst_sample = max_audioval; |
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|
318 } else if (dst_sample < min_audioval) { |
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|
319 dst_sample = min_audioval; |
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|
320 } |
2014
7abe37467fa5
Replaced unions with calls to SDL_SwapFloat...
Ryan C. Gordon <icculus@icculus.org>
parents:
2013
diff
changeset
|
321 *(dst32++) = SDL_SwapFloatLE((float) dst_sample); |
1982
3b4ce57c6215
First shot at new audio data types (int32 and float32).
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|
322 } |
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|
323 } |
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|
324 break; |
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|
325 |
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|
326 case AUDIO_F32MSB: |
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|
327 { |
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|
328 const float fmaxvolume = 1.0f / ((float) SDL_MIX_MAXVOLUME); |
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|
329 const float fvolume = (float) volume; |
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|
330 const float *src32 = (float *) src; |
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|
331 float *dst32 = (float *) dst; |
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332 float src1, src2; |
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333 double dst_sample; |
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334 /* !!! FIXME: are these right? */ |
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335 const double max_audioval = 3.402823466e+38F; |
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336 const double min_audioval = -3.402823466e+38F; |
1982
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337 |
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338 len /= 4; |
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339 while (len--) { |
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340 src1 = ((SDL_SwapFloatBE(*src32) * fvolume) * fmaxvolume); |
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341 src2 = SDL_SwapFloatBE(*dst32); |
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342 src32++; |
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343 |
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344 dst_sample = ((double) src1) + ((double) src2); |
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345 if (dst_sample > max_audioval) { |
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346 dst_sample = max_audioval; |
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347 } else if (dst_sample < min_audioval) { |
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348 dst_sample = min_audioval; |
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349 } |
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350 *(dst32++) = SDL_SwapFloatBE((float) dst_sample); |
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351 } |
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352 } |
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353 break; |
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354 |
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355 default: /* If this happens... FIXME! */ |
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356 SDL_SetError("SDL_MixAudio(): unknown audio format"); |
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357 return; |
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358 } |
0 | 359 } |
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360 |
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361 /* vi: set ts=4 sw=4 expandtab: */ |