Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer.c @ 666:fbec2501cf9f
ate: Mon, 4 Aug 2003 19:10:14 +0300
From: "Mike Gorchak"
Subject: SDL/QNX forgotten fixes
Just found, that one chunk for configure.in has not been applied and one for\
gotten by me :) Please add it to CVS.
P.S. Now QNX6.2.1 have the dlopen in libc and in the libltdl. So libc's vari\
ant more prefered, and ltdl rest for compatibility. In this small patch I wa\
s added proper checks.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 06 Aug 2003 20:20:30 +0000 |
| parents | 873c2598f969 |
| children | 22dbf364c017 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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" | |
| 37 #include "SDL_sysaudio.h" | |
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38 #include "SDL_mixer_MMX.h" |
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39 #include "SDL_mixer_MMX_VC.h" |
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40 #include "SDL_mixer_m68k.h" |
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42 /* Function to check the CPU flags */ |
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43 #define MMX_CPU 0x800000 |
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44 #ifdef USE_ASMBLIT |
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45 #define CPU_Flags() Hermes_X86_CPU() |
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46 #else |
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47 #define CPU_Flags() 0L |
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48 #endif |
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49 |
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50 #ifdef USE_ASMBLIT |
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51 #define X86_ASSEMBLER |
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52 #define HermesConverterInterface void |
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53 #define HermesClearInterface void |
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54 #define STACKCALL |
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55 |
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56 #include "HeadX86.h" |
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57 #endif |
| 0 | 58 |
| 59 /* This table is used to add two sound values together and pin | |
| 60 * the value to avoid overflow. (used with permission from ARDI) | |
| 61 * Changed to use 0xFE instead of 0xFF for better sound quality. | |
| 62 */ | |
| 63 static const Uint8 mix8[] = | |
| 64 { | |
| 65 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 66 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 67 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 68 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 69 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 70 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 71 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 72 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 73 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 74 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 75 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 76 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, | |
| 77 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, | |
| 78 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, | |
| 79 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, | |
| 80 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, | |
| 81 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, | |
| 82 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, | |
| 83 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, | |
| 84 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, | |
| 85 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, | |
| 86 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, | |
| 87 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, | |
| 88 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | |
| 89 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, | |
| 90 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, | |
| 91 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, | |
| 92 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, | |
| 93 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, | |
| 94 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, | |
| 95 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, | |
| 96 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, | |
| 97 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, | |
| 98 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, | |
| 99 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFE, 0xFE, | |
| 100 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 101 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 102 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 103 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 104 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 105 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 106 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 107 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 108 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 109 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 110 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 111 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE | |
| 112 }; | |
| 113 | |
| 114 /* The volume ranges from 0 - 128 */ | |
| 115 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME) | |
| 116 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128) | |
| 117 | |
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118 void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume) |
| 0 | 119 { |
| 120 Uint16 format; | |
| 121 | |
| 122 if ( volume == 0 ) { | |
| 123 return; | |
| 124 } | |
| 125 /* Mix the user-level audio format */ | |
| 126 if ( current_audio ) { | |
| 127 if ( current_audio->convert.needed ) { | |
| 128 format = current_audio->convert.src_format; | |
| 129 } else { | |
| 130 format = current_audio->spec.format; | |
| 131 } | |
| 132 } else { | |
| 133 /* HACK HACK HACK */ | |
| 134 format = AUDIO_S16; | |
| 135 } | |
| 136 switch (format) { | |
| 137 | |
| 138 case AUDIO_U8: { | |
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139 #if defined(__M68000__) && defined(__GNUC__) |
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140 SDL_MixAudio_m68k_U8((char*)dst,(char*)src,(unsigned long)len,(long)volume,(char *)mix8); |
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141 #else |
| 0 | 142 Uint8 src_sample; |
| 143 | |
| 144 while ( len-- ) { | |
| 145 src_sample = *src; | |
| 146 ADJUST_VOLUME_U8(src_sample, volume); | |
| 147 *dst = mix8[*dst+src_sample]; | |
| 148 ++dst; | |
| 149 ++src; | |
| 150 } | |
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151 #endif |
| 0 | 152 } |
| 153 break; | |
| 154 | |
| 155 case AUDIO_S8: { | |
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156 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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157 if (CPU_Flags() & MMX_CPU) |
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158 { |
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159 SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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160 } |
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161 else |
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162 #endif |
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163 #if defined(USE_ASM_MIXER_VC) |
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164 if (SDL_IsMMX_VC()) |
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165 { |
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166 SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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167 } |
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168 else |
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169 #endif |
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170 #if defined(__M68000__) && defined(__GNUC__) |
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171 SDL_MixAudio_m68k_S8((char*)dst,(char*)src,(unsigned long)len,(long)volume); |
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172 #else |
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173 { |
| 0 | 174 Sint8 *dst8, *src8; |
| 175 Sint8 src_sample; | |
| 176 int dst_sample; | |
| 177 const int max_audioval = ((1<<(8-1))-1); | |
| 178 const int min_audioval = -(1<<(8-1)); | |
| 179 | |
| 180 src8 = (Sint8 *)src; | |
| 181 dst8 = (Sint8 *)dst; | |
| 182 while ( len-- ) { | |
| 183 src_sample = *src8; | |
| 184 ADJUST_VOLUME(src_sample, volume); | |
| 185 dst_sample = *dst8 + src_sample; | |
| 186 if ( dst_sample > max_audioval ) { | |
| 187 *dst8 = max_audioval; | |
| 188 } else | |
| 189 if ( dst_sample < min_audioval ) { | |
| 190 *dst8 = min_audioval; | |
| 191 } else { | |
| 192 *dst8 = dst_sample; | |
| 193 } | |
| 194 ++dst8; | |
| 195 ++src8; | |
| 196 } | |
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197 } |
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198 #endif |
| 0 | 199 } |
| 200 break; | |
| 201 | |
| 202 case AUDIO_S16LSB: { | |
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203 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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204 if (CPU_Flags() & MMX_CPU) |
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205 { |
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206 SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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207 } |
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208 else |
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209 #elif defined(USE_ASM_MIXER_VC) |
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210 if (SDL_IsMMX_VC()) |
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211 { |
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212 SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
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213 } |
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214 else |
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215 #endif |
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216 #if defined(__M68000__) && defined(__GNUC__) |
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217 SDL_MixAudio_m68k_S16LSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
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218 #else |
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219 { |
| 0 | 220 Sint16 src1, src2; |
| 221 int dst_sample; | |
| 222 const int max_audioval = ((1<<(16-1))-1); | |
| 223 const int min_audioval = -(1<<(16-1)); | |
| 224 | |
| 225 len /= 2; | |
| 226 while ( len-- ) { | |
| 227 src1 = ((src[1])<<8|src[0]); | |
| 228 ADJUST_VOLUME(src1, volume); | |
| 229 src2 = ((dst[1])<<8|dst[0]); | |
| 230 src += 2; | |
| 231 dst_sample = src1+src2; | |
| 232 if ( dst_sample > max_audioval ) { | |
| 233 dst_sample = max_audioval; | |
| 234 } else | |
| 235 if ( dst_sample < min_audioval ) { | |
| 236 dst_sample = min_audioval; | |
| 237 } | |
| 238 dst[0] = dst_sample&0xFF; | |
| 239 dst_sample >>= 8; | |
| 240 dst[1] = dst_sample&0xFF; | |
| 241 dst += 2; | |
| 242 } | |
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243 } |
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244 #endif |
| 0 | 245 } |
| 246 break; | |
| 247 | |
| 248 case AUDIO_S16MSB: { | |
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249 #if defined(__M68000__) && defined(__GNUC__) |
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250 SDL_MixAudio_m68k_S16MSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
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251 #else |
| 0 | 252 Sint16 src1, src2; |
| 253 int dst_sample; | |
| 254 const int max_audioval = ((1<<(16-1))-1); | |
| 255 const int min_audioval = -(1<<(16-1)); | |
| 256 | |
| 257 len /= 2; | |
| 258 while ( len-- ) { | |
| 259 src1 = ((src[0])<<8|src[1]); | |
| 260 ADJUST_VOLUME(src1, volume); | |
| 261 src2 = ((dst[0])<<8|dst[1]); | |
| 262 src += 2; | |
| 263 dst_sample = src1+src2; | |
| 264 if ( dst_sample > max_audioval ) { | |
| 265 dst_sample = max_audioval; | |
| 266 } else | |
| 267 if ( dst_sample < min_audioval ) { | |
| 268 dst_sample = min_audioval; | |
| 269 } | |
| 270 dst[1] = dst_sample&0xFF; | |
| 271 dst_sample >>= 8; | |
| 272 dst[0] = dst_sample&0xFF; | |
| 273 dst += 2; | |
| 274 } | |
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275 #endif |
| 0 | 276 } |
| 277 break; | |
| 278 | |
| 279 default: /* If this happens... FIXME! */ | |
| 280 SDL_SetError("SDL_MixAudio(): unknown audio format"); | |
| 281 return; | |
| 282 } | |
| 283 } | |
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284 |