Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 06 Feb 2006 08:28:51 +0000 |
| parents | c9b51268668f |
| children | c71e05b4dc2e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
1
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* This provides the default mixing callback for the SDL audio routines */ | |
| 24 | |
| 25 #include "SDL_audio.h" | |
| 26 #include "SDL_mutex.h" | |
| 27 #include "SDL_timer.h" | |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
633
diff
changeset
|
28 #include "SDL_cpuinfo.h" |
| 0 | 29 #include "SDL_sysaudio.h" |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
633
diff
changeset
|
30 #include "SDL_cpuinfo.h" |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
31 #include "SDL_mixer_MMX.h" |
|
574
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
32 #include "SDL_mixer_MMX_VC.h" |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
33 #include "SDL_mixer_m68k.h" |
| 0 | 34 |
| 35 /* This table is used to add two sound values together and pin | |
| 36 * the value to avoid overflow. (used with permission from ARDI) | |
| 37 * Changed to use 0xFE instead of 0xFF for better sound quality. | |
| 38 */ | |
| 39 static const Uint8 mix8[] = | |
| 40 { | |
| 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, 0x00, 0x00, 0x00, | |
| 51 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
| 52 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, | |
| 53 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, | |
| 54 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, | |
| 55 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, | |
| 56 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, | |
| 57 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, | |
| 58 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, | |
| 59 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, | |
| 60 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, | |
| 61 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, | |
| 62 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, | |
| 63 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, | |
| 64 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, | |
| 65 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, | |
| 66 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, | |
| 67 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, | |
| 68 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, | |
| 69 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, | |
| 70 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, | |
| 71 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, | |
| 72 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, | |
| 73 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, | |
| 74 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, | |
| 75 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 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, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 86 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, | |
| 87 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE | |
| 88 }; | |
| 89 | |
| 90 /* The volume ranges from 0 - 128 */ | |
| 91 #define ADJUST_VOLUME(s, v) (s = (s*v)/SDL_MIX_MAXVOLUME) | |
| 92 #define ADJUST_VOLUME_U8(s, v) (s = (((s-128)*v)/SDL_MIX_MAXVOLUME)+128) | |
| 93 | |
|
1
cf2af46e9e2a
Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
94 void SDL_MixAudio (Uint8 *dst, const Uint8 *src, Uint32 len, int volume) |
| 0 | 95 { |
| 96 Uint16 format; | |
| 97 | |
| 98 if ( volume == 0 ) { | |
| 99 return; | |
| 100 } | |
| 101 /* Mix the user-level audio format */ | |
| 102 if ( current_audio ) { | |
| 103 if ( current_audio->convert.needed ) { | |
| 104 format = current_audio->convert.src_format; | |
| 105 } else { | |
| 106 format = current_audio->spec.format; | |
| 107 } | |
| 108 } else { | |
| 109 /* HACK HACK HACK */ | |
| 110 format = AUDIO_S16; | |
| 111 } | |
| 112 switch (format) { | |
| 113 | |
| 114 case AUDIO_U8: { | |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
115 #if defined(__M68000__) && defined(__GNUC__) |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
116 SDL_MixAudio_m68k_U8((char*)dst,(char*)src,(unsigned long)len,(long)volume,(char *)mix8); |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
117 #else |
| 0 | 118 Uint8 src_sample; |
| 119 | |
| 120 while ( len-- ) { | |
| 121 src_sample = *src; | |
| 122 ADJUST_VOLUME_U8(src_sample, volume); | |
| 123 *dst = mix8[*dst+src_sample]; | |
| 124 ++dst; | |
| 125 ++src; | |
| 126 } | |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
127 #endif |
| 0 | 128 } |
| 129 break; | |
| 130 | |
| 131 case AUDIO_S8: { | |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
132 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
633
diff
changeset
|
133 if (SDL_HasMMX()) |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
134 { |
|
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
135 SDL_MixAudio_MMX_S8((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
|
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
136 } |
|
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
137 else |
|
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
138 #endif |
|
574
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
139 #if defined(USE_ASM_MIXER_VC) |
|
746
72ef7ce609ef
Greatly simplified the SDL CPU info code
Sam Lantinga <slouken@libsdl.org>
parents:
739
diff
changeset
|
140 if (SDL_HasMMX()) |
|
574
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
141 { |
|
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
142 SDL_MixAudio_MMX_S8_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
|
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
143 } |
|
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
144 else |
|
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
145 #endif |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
146 #if defined(__M68000__) && defined(__GNUC__) |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
147 SDL_MixAudio_m68k_S8((char*)dst,(char*)src,(unsigned long)len,(long)volume); |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
148 #else |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
149 { |
| 0 | 150 Sint8 *dst8, *src8; |
| 151 Sint8 src_sample; | |
| 152 int dst_sample; | |
| 153 const int max_audioval = ((1<<(8-1))-1); | |
| 154 const int min_audioval = -(1<<(8-1)); | |
| 155 | |
| 156 src8 = (Sint8 *)src; | |
| 157 dst8 = (Sint8 *)dst; | |
| 158 while ( len-- ) { | |
| 159 src_sample = *src8; | |
| 160 ADJUST_VOLUME(src_sample, volume); | |
| 161 dst_sample = *dst8 + src_sample; | |
| 162 if ( dst_sample > max_audioval ) { | |
| 163 *dst8 = max_audioval; | |
| 164 } else | |
| 165 if ( dst_sample < min_audioval ) { | |
| 166 *dst8 = min_audioval; | |
| 167 } else { | |
| 168 *dst8 = dst_sample; | |
| 169 } | |
| 170 ++dst8; | |
| 171 ++src8; | |
| 172 } | |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
173 } |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
174 #endif |
| 0 | 175 } |
| 176 break; | |
| 177 | |
| 178 case AUDIO_S16LSB: { | |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
179 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
633
diff
changeset
|
180 if (SDL_HasMMX()) |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
181 { |
|
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
182 SDL_MixAudio_MMX_S16((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
|
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
183 } |
|
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
184 else |
|
574
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
185 #elif defined(USE_ASM_MIXER_VC) |
|
746
72ef7ce609ef
Greatly simplified the SDL CPU info code
Sam Lantinga <slouken@libsdl.org>
parents:
739
diff
changeset
|
186 if (SDL_HasMMX()) |
|
574
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
187 { |
|
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
188 SDL_MixAudio_MMX_S16_VC((char*)dst,(char*)src,(unsigned int)len,(int)volume); |
|
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
189 } |
|
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
190 else |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
191 #endif |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
192 #if defined(__M68000__) && defined(__GNUC__) |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
193 SDL_MixAudio_m68k_S16LSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
194 #else |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
195 { |
| 0 | 196 Sint16 src1, src2; |
| 197 int dst_sample; | |
| 198 const int max_audioval = ((1<<(16-1))-1); | |
| 199 const int min_audioval = -(1<<(16-1)); | |
| 200 | |
| 201 len /= 2; | |
| 202 while ( len-- ) { | |
| 203 src1 = ((src[1])<<8|src[0]); | |
| 204 ADJUST_VOLUME(src1, volume); | |
| 205 src2 = ((dst[1])<<8|dst[0]); | |
| 206 src += 2; | |
| 207 dst_sample = src1+src2; | |
| 208 if ( dst_sample > max_audioval ) { | |
| 209 dst_sample = max_audioval; | |
| 210 } else | |
| 211 if ( dst_sample < min_audioval ) { | |
| 212 dst_sample = min_audioval; | |
| 213 } | |
| 214 dst[0] = dst_sample&0xFF; | |
| 215 dst_sample >>= 8; | |
| 216 dst[1] = dst_sample&0xFF; | |
| 217 dst += 2; | |
| 218 } | |
|
539
a9e38f3b8e4d
Added MMX audio mixing code for gcc (thanks Stephane!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
219 } |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
220 #endif |
| 0 | 221 } |
| 222 break; | |
| 223 | |
| 224 case AUDIO_S16MSB: { | |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
225 #if defined(__M68000__) && defined(__GNUC__) |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
226 SDL_MixAudio_m68k_S16MSB((short*)dst,(short*)src,(unsigned long)len,(long)volume); |
|
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
227 #else |
| 0 | 228 Sint16 src1, src2; |
| 229 int dst_sample; | |
| 230 const int max_audioval = ((1<<(16-1))-1); | |
| 231 const int min_audioval = -(1<<(16-1)); | |
| 232 | |
| 233 len /= 2; | |
| 234 while ( len-- ) { | |
| 235 src1 = ((src[0])<<8|src[1]); | |
| 236 ADJUST_VOLUME(src1, volume); | |
| 237 src2 = ((dst[0])<<8|dst[1]); | |
| 238 src += 2; | |
| 239 dst_sample = src1+src2; | |
| 240 if ( dst_sample > max_audioval ) { | |
| 241 dst_sample = max_audioval; | |
| 242 } else | |
| 243 if ( dst_sample < min_audioval ) { | |
| 244 dst_sample = min_audioval; | |
| 245 } | |
| 246 dst[1] = dst_sample&0xFF; | |
| 247 dst_sample >>= 8; | |
| 248 dst[0] = dst_sample&0xFF; | |
| 249 dst += 2; | |
| 250 } | |
|
633
873c2598f969
Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
574
diff
changeset
|
251 #endif |
| 0 | 252 } |
| 253 break; | |
| 254 | |
| 255 default: /* If this happens... FIXME! */ | |
| 256 SDL_SetError("SDL_MixAudio(): unknown audio format"); | |
| 257 return; | |
| 258 } | |
| 259 } | |
|
574
64fe373be3dc
Cth converted the MMX audio mixing routines to VC++ syntax
Sam Lantinga <slouken@libsdl.org>
parents:
539
diff
changeset
|
260 |