Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer.c @ 1358:c71e05b4dc2e
More header massaging... works great on Windows. ;-)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 06:48:43 +0000 |
| parents | 450721ad5436 |
| children | d910939febfa |
| rev | line source |
|---|---|
| 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 */ |
| 22 | |
| 23 /* This provides the default mixing callback for the SDL audio routines */ | |
| 24 | |
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25 #include "SDL_cpuinfo.h" |
| 0 | 26 #include "SDL_timer.h" |
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27 #include "SDL_audio.h" |
| 0 | 28 #include "SDL_sysaudio.h" |
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29 #include "SDL_mixer_MMX.h" |
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30 #include "SDL_mixer_MMX_VC.h" |
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31 #include "SDL_mixer_m68k.h" |
| 0 | 32 |
| 33 /* This table is used to add two sound values together and pin | |
| 34 * the value to avoid overflow. (used with permission from ARDI) | |
| 35 * Changed to use 0xFE instead of 0xFF for better sound quality. | |
| 36 */ | |
| 37 static const Uint8 mix8[] = | |
| 38 { | |
| 39 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 40 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 41 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 42 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 43 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 44 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 45 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 46 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 47 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 48 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 49 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, | |
| 51 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, | |
| 52 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, | |
| 53 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, | |
| 54 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, | |
| 55 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, | |
| 56 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, | |
| 57 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, | |
| 58 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, | |
| 59 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, | |
| 60 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, | |
| 61 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, | |
| 62 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | |
| 63 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, | |
| 64 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, | |
| 65 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, | |
| 66 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, | |
| 67 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, | |
| 68 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, | |
| 69 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, | |
| 70 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, | |
| 71 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, | |
| 72 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, | |
| 73 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE, | |
| 74 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 75 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 76 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 77 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 78 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 79 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 80 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 81 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 82 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 83 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 84 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 85 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE | |
| 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 | |
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92 void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume) |
| 0 | 93 { |
| 94 Uint16 format; | |
| 95 | |
| 96 if ( volume == 0 ) { | |
| 97 return; | |
| 98 } | |
| 99 /* Mix the user-level audio format */ | |
| 100 if ( current_audio ) { | |
| 101 if ( current_audio->convert.needed ) { | |
| 102 format = current_audio->convert.src_format; | |
| 103 } else { | |
| 104 format = current_audio->spec.format; | |
| 105 } | |
| 106 } else { | |
| 107 /* HACK HACK HACK */ | |
| 108 format = AUDIO_S16; | |
| 109 } | |
| 110 switch (format) { | |
| 111 | |
| 112 case AUDIO_U8: { | |
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113 #if defined(__M68000__) && defined(__GNUC__) |
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114 SDL_MixAudio_m68k_U8((char*)dst,(char*)src,(unsigned long)len,(long)volume,(char *)mix8); |
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115 #else |
| 0 | 116 Uint8 src_sample; |
| 117 | |
| 118 while ( len-- ) { | |
| 119 src_sample = *src; | |
| 120 ADJUST_VOLUME_U8(src_sample, volume); | |
| 121 *dst = mix8[*dst+src_sample]; | |
| 122 ++dst; | |
| 123 ++src; | |
| 124 } | |
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125 #endif |
| 0 | 126 } |
| 127 break; | |
| 128 | |
| 129 case AUDIO_S8: { | |
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130 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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131 if (SDL_HasMMX()) |
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132 { |
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133 SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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134 } |
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135 else |
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136 #endif |
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137 #if defined(USE_ASM_MIXER_VC) |
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138 if (SDL_HasMMX()) |
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139 { |
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140 SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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141 } |
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142 else |
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143 #endif |
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144 #if defined(__M68000__) && defined(__GNUC__) |
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145 SDL_MixAudio_m68k_S8((char*)dst,(char*)src,(unsigned long)len,(long)volume); |
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146 #else |
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147 { |
| 0 | 148 Sint8 *dst8, *src8; |
| 149 Sint8 src_sample; | |
| 150 int dst_sample; | |
| 151 const int max_audioval = ((1<<(8-1))-1); | |
| 152 const int min_audioval = -(1<<(8-1)); | |
| 153 | |
| 154 src8 = (Sint8 *)src; | |
| 155 dst8 = (Sint8 *)dst; | |
| 156 while ( len-- ) { | |
| 157 src_sample = *src8; | |
| 158 ADJUST_VOLUME(src_sample, volume); | |
| 159 dst_sample = *dst8 + src_sample; | |
| 160 if ( dst_sample > max_audioval ) { | |
| 161 *dst8 = max_audioval; | |
| 162 } else | |
| 163 if ( dst_sample < min_audioval ) { | |
| 164 *dst8 = min_audioval; | |
| 165 } else { | |
| 166 *dst8 = dst_sample; | |
| 167 } | |
| 168 ++dst8; | |
| 169 ++src8; | |
| 170 } | |
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171 } |
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172 #endif |
| 0 | 173 } |
| 174 break; | |
| 175 | |
| 176 case AUDIO_S16LSB: { | |
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177 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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178 if (SDL_HasMMX()) |
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179 { |
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180 SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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181 } |
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182 else |
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183 #elif defined(USE_ASM_MIXER_VC) |
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184 if (SDL_HasMMX()) |
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185 { |
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186 SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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187 } |
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188 else |
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189 #endif |
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190 #if defined(__M68000__) && defined(__GNUC__) |
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191 SDL_MixAudio_m68k_S16LSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
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192 #else |
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193 { |
| 0 | 194 Sint16 src1, src2; |
| 195 int dst_sample; | |
| 196 const int max_audioval = ((1<<(16-1))-1); | |
| 197 const int min_audioval = -(1<<(16-1)); | |
| 198 | |
| 199 len /= 2; | |
| 200 while ( len-- ) { | |
| 201 src1 = ((src[1])<<8|src[0]); | |
| 202 ADJUST_VOLUME(src1, volume); | |
| 203 src2 = ((dst[1])<<8|dst[0]); | |
| 204 src += 2; | |
| 205 dst_sample = src1+src2; | |
| 206 if ( dst_sample > max_audioval ) { | |
| 207 dst_sample = max_audioval; | |
| 208 } else | |
| 209 if ( dst_sample < min_audioval ) { | |
| 210 dst_sample = min_audioval; | |
| 211 } | |
| 212 dst[0] = dst_sample&0xFF; | |
| 213 dst_sample >>= 8; | |
| 214 dst[1] = dst_sample&0xFF; | |
| 215 dst += 2; | |
| 216 } | |
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217 } |
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218 #endif |
| 0 | 219 } |
| 220 break; | |
| 221 | |
| 222 case AUDIO_S16MSB: { | |
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223 #if defined(__M68000__) && defined(__GNUC__) |
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224 SDL_MixAudio_m68k_S16MSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
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225 #else |
| 0 | 226 Sint16 src1, src2; |
| 227 int dst_sample; | |
| 228 const int max_audioval = ((1<<(16-1))-1); | |
| 229 const int min_audioval = -(1<<(16-1)); | |
| 230 | |
| 231 len /= 2; | |
| 232 while ( len-- ) { | |
| 233 src1 = ((src[0])<<8|src[1]); | |
| 234 ADJUST_VOLUME(src1, volume); | |
| 235 src2 = ((dst[0])<<8|dst[1]); | |
| 236 src += 2; | |
| 237 dst_sample = src1+src2; | |
| 238 if ( dst_sample > max_audioval ) { | |
| 239 dst_sample = max_audioval; | |
| 240 } else | |
| 241 if ( dst_sample < min_audioval ) { | |
| 242 dst_sample = min_audioval; | |
| 243 } | |
| 244 dst[1] = dst_sample&0xFF; | |
| 245 dst_sample >>= 8; | |
| 246 dst[0] = dst_sample&0xFF; | |
| 247 dst += 2; | |
| 248 } | |
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249 #endif |
| 0 | 250 } |
| 251 break; | |
| 252 | |
| 253 default: /* If this happens... FIXME! */ | |
| 254 SDL_SetError("SDL_MixAudio(): unknown audio format"); | |
| 255 return; | |
| 256 } | |
| 257 } | |
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258 |