Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer.c @ 1258:b2283b0ded26
Date: Thu, 19 Jan 2006 20:02:29 +0200
From: Vassilis Virvilis <vasvir@iit.demokritos.gr>
Subject: [SDL] Request: Please reconsider adding tag in SDL_Event
Hi,
Patch in question:
--- include/SDL_events.h 20 Aug 2004 18:57:01 -0000 1.11
+++ include/SDL_events.h 19 Jan 2006 17:35:09 -0000
@@ -214,7 +214,7 @@
} SDL_SysWMEvent;
/* General event structure */
-typedef union {
+typedef union SDL_Event {
Uint8 type;
SDL_ActiveEvent active;
SDL_KeyboardEvent key;
Reasoning:
----------
1) Allows forward declaration of the SDL_Event union in C++. Please
note that in plain C it is possible to forward declare it.
2) Forward declaration is good because it allows encapsulation. It hides
the specific implementation and does not necessarily exposes SDL staff
to my appication's namespace
3) It can't harm plain C because tags are living in a different namespace
than typenames
4) It is already done like this in other places in SDL. Check for example
SDL_KeySym, and SDL_.*Event structures.
5) Right now I have to include SDL/event.h from a C++ header file. See 2)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 20 Jan 2006 13:07:25 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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|
3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* This provides the default mixing callback for the SDL audio routines */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 | |
| 34 #include "SDL_audio.h" | |
| 35 #include "SDL_mutex.h" | |
| 36 #include "SDL_timer.h" | |
|
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37 #include "SDL_cpuinfo.h" |
| 0 | 38 #include "SDL_sysaudio.h" |
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39 #include "SDL_cpuinfo.h" |
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40 #include "SDL_mixer_MMX.h" |
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41 #include "SDL_mixer_MMX_VC.h" |
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42 #include "SDL_mixer_m68k.h" |
| 0 | 43 |
| 44 /* This table is used to add two sound values together and pin | |
| 45 * the value to avoid overflow. (used with permission from ARDI) | |
| 46 * Changed to use 0xFE instead of 0xFF for better sound quality. | |
| 47 */ | |
| 48 static const Uint8 mix8[] = | |
| 49 { | |
| 50 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 51 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 52 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 53 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 54 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 55 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 56 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 57 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 58 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 59 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 60 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, | |
| 62 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, | |
| 63 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, | |
| 64 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, | |
| 65 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, | |
| 66 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, | |
| 67 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, | |
| 68 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, | |
| 69 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, | |
| 70 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, | |
| 71 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, | |
| 72 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, | |
| 73 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | |
| 74 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, | |
| 75 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, | |
| 76 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, | |
| 77 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, | |
| 78 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, | |
| 79 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, | |
| 80 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, | |
| 81 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, | |
| 82 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, | |
| 83 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, | |
| 84 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE, | |
| 85 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 86 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 87 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 88 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 89 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 90 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 91 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 92 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 93 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 94 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 95 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 96 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE | |
| 97 }; | |
| 98 | |
| 99 /* The volume ranges from 0 - 128 */ | |
| 100 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME) | |
| 101 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128) | |
| 102 | |
|
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103 void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume) |
| 0 | 104 { |
| 105 Uint16 format; | |
| 106 | |
| 107 if ( volume == 0 ) { | |
| 108 return; | |
| 109 } | |
| 110 /* Mix the user-level audio format */ | |
| 111 if ( current_audio ) { | |
| 112 if ( current_audio->convert.needed ) { | |
| 113 format = current_audio->convert.src_format; | |
| 114 } else { | |
| 115 format = current_audio->spec.format; | |
| 116 } | |
| 117 } else { | |
| 118 /* HACK HACK HACK */ | |
| 119 format = AUDIO_S16; | |
| 120 } | |
| 121 switch (format) { | |
| 122 | |
| 123 case AUDIO_U8: { | |
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124 #if defined(__M68000__) && defined(__GNUC__) |
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125 SDL_MixAudio_m68k_U8((char*)dst,(char*)src,(unsigned long)len,(long)volume,(char *)mix8); |
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126 #else |
| 0 | 127 Uint8 src_sample; |
| 128 | |
| 129 while ( len-- ) { | |
| 130 src_sample = *src; | |
| 131 ADJUST_VOLUME_U8(src_sample, volume); | |
| 132 *dst = mix8[*dst+src_sample]; | |
| 133 ++dst; | |
| 134 ++src; | |
| 135 } | |
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136 #endif |
| 0 | 137 } |
| 138 break; | |
| 139 | |
| 140 case AUDIO_S8: { | |
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141 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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142 if (SDL_HasMMX()) |
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143 { |
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144 SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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145 } |
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146 else |
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147 #endif |
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148 #if defined(USE_ASM_MIXER_VC) |
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149 if (SDL_HasMMX()) |
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150 { |
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151 SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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152 } |
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153 else |
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154 #endif |
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155 #if defined(__M68000__) && defined(__GNUC__) |
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156 SDL_MixAudio_m68k_S8((char*)dst,(char*)src,(unsigned long)len,(long)volume); |
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157 #else |
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158 { |
| 0 | 159 Sint8 *dst8, *src8; |
| 160 Sint8 src_sample; | |
| 161 int dst_sample; | |
| 162 const int max_audioval = ((1<<(8-1))-1); | |
| 163 const int min_audioval = -(1<<(8-1)); | |
| 164 | |
| 165 src8 = (Sint8 *)src; | |
| 166 dst8 = (Sint8 *)dst; | |
| 167 while ( len-- ) { | |
| 168 src_sample = *src8; | |
| 169 ADJUST_VOLUME(src_sample, volume); | |
| 170 dst_sample = *dst8 + src_sample; | |
| 171 if ( dst_sample > max_audioval ) { | |
| 172 *dst8 = max_audioval; | |
| 173 } else | |
| 174 if ( dst_sample < min_audioval ) { | |
| 175 *dst8 = min_audioval; | |
| 176 } else { | |
| 177 *dst8 = dst_sample; | |
| 178 } | |
| 179 ++dst8; | |
| 180 ++src8; | |
| 181 } | |
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182 } |
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183 #endif |
| 0 | 184 } |
| 185 break; | |
| 186 | |
| 187 case AUDIO_S16LSB: { | |
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188 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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189 if (SDL_HasMMX()) |
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190 { |
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191 SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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192 } |
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193 else |
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194 #elif defined(USE_ASM_MIXER_VC) |
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195 if (SDL_HasMMX()) |
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196 { |
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197 SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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198 } |
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199 else |
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200 #endif |
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201 #if defined(__M68000__) && defined(__GNUC__) |
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202 SDL_MixAudio_m68k_S16LSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
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203 #else |
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204 { |
| 0 | 205 Sint16 src1, src2; |
| 206 int dst_sample; | |
| 207 const int max_audioval = ((1<<(16-1))-1); | |
| 208 const int min_audioval = -(1<<(16-1)); | |
| 209 | |
| 210 len /= 2; | |
| 211 while ( len-- ) { | |
| 212 src1 = ((src[1])<<8|src[0]); | |
| 213 ADJUST_VOLUME(src1, volume); | |
| 214 src2 = ((dst[1])<<8|dst[0]); | |
| 215 src += 2; | |
| 216 dst_sample = src1+src2; | |
| 217 if ( dst_sample > max_audioval ) { | |
| 218 dst_sample = max_audioval; | |
| 219 } else | |
| 220 if ( dst_sample < min_audioval ) { | |
| 221 dst_sample = min_audioval; | |
| 222 } | |
| 223 dst[0] = dst_sample&0xFF; | |
| 224 dst_sample >>= 8; | |
| 225 dst[1] = dst_sample&0xFF; | |
| 226 dst += 2; | |
| 227 } | |
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228 } |
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229 #endif |
| 0 | 230 } |
| 231 break; | |
| 232 | |
| 233 case AUDIO_S16MSB: { | |
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234 #if defined(__M68000__) && defined(__GNUC__) |
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235 SDL_MixAudio_m68k_S16MSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
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236 #else |
| 0 | 237 Sint16 src1, src2; |
| 238 int dst_sample; | |
| 239 const int max_audioval = ((1<<(16-1))-1); | |
| 240 const int min_audioval = -(1<<(16-1)); | |
| 241 | |
| 242 len /= 2; | |
| 243 while ( len-- ) { | |
| 244 src1 = ((src[0])<<8|src[1]); | |
| 245 ADJUST_VOLUME(src1, volume); | |
| 246 src2 = ((dst[0])<<8|dst[1]); | |
| 247 src += 2; | |
| 248 dst_sample = src1+src2; | |
| 249 if ( dst_sample > max_audioval ) { | |
| 250 dst_sample = max_audioval; | |
| 251 } else | |
| 252 if ( dst_sample < min_audioval ) { | |
| 253 dst_sample = min_audioval; | |
| 254 } | |
| 255 dst[1] = dst_sample&0xFF; | |
| 256 dst_sample >>= 8; | |
| 257 dst[0] = dst_sample&0xFF; | |
| 258 dst += 2; | |
| 259 } | |
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260 #endif |
| 0 | 261 } |
| 262 break; | |
| 263 | |
| 264 default: /* If this happens... FIXME! */ | |
| 265 SDL_SetError("SDL_MixAudio(): unknown audio format"); | |
| 266 return; | |
| 267 } | |
| 268 } | |
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269 |