Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audiodev.c @ 4001:6831b8723a85 SDL-1.2
Don't initialize the audio buffer passed to the application's audio callback,
since they are expected to entirely fill it with data or silence.
For legacy apps that might expect the buffer to already have silence and thus
may not fill the buffer in the callback, there's an environment variable to
expose the old behaviour.
Fixes Bugzilla #416.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 05 Jul 2007 02:24:36 +0000 |
| parents | 12b6d331d82a |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| 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 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Get the name of the audio device we use for output */ | |
| 25 | |
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26 #if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO |
| 0 | 27 |
| 28 #include <fcntl.h> | |
| 29 #include <sys/types.h> | |
| 30 #include <sys/stat.h> | |
| 31 | |
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32 #include "SDL_stdinc.h" |
| 0 | 33 #include "SDL_audiodev_c.h" |
| 34 | |
| 35 #ifndef _PATH_DEV_DSP | |
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36 #if defined(__NETBSD__) || defined(__OPENBSD__) |
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37 #define _PATH_DEV_DSP "/dev/audio" |
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38 #else |
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39 #define _PATH_DEV_DSP "/dev/dsp" |
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40 #endif |
| 0 | 41 #endif |
| 42 #ifndef _PATH_DEV_DSP24 | |
| 43 #define _PATH_DEV_DSP24 "/dev/sound/dsp" | |
| 44 #endif | |
| 45 #ifndef _PATH_DEV_AUDIO | |
| 46 #define _PATH_DEV_AUDIO "/dev/audio" | |
| 47 #endif | |
| 48 | |
| 49 | |
| 50 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic) | |
| 51 { | |
| 52 const char *audiodev; | |
| 53 int audio_fd; | |
| 54 char audiopath[1024]; | |
| 55 | |
| 56 /* Figure out what our audio device is */ | |
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57 if ( ((audiodev=SDL_getenv("SDL_PATH_DSP")) == NULL) && |
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58 ((audiodev=SDL_getenv("AUDIODEV")) == NULL) ) { |
| 0 | 59 if ( classic ) { |
| 60 audiodev = _PATH_DEV_AUDIO; | |
| 61 } else { | |
| 62 struct stat sb; | |
| 63 | |
| 64 /* Added support for /dev/sound/\* in Linux 2.4 */ | |
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65 if ( ((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode)) && |
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66 ((stat(_PATH_DEV_DSP24, &sb) == 0) && S_ISCHR(sb.st_mode)) ) { |
| 0 | 67 audiodev = _PATH_DEV_DSP24; |
| 68 } else { | |
| 69 audiodev = _PATH_DEV_DSP; | |
| 70 } | |
| 71 } | |
| 72 } | |
| 73 audio_fd = open(audiodev, flags, 0); | |
| 74 | |
| 75 /* If the first open fails, look for other devices */ | |
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76 if ( (audio_fd < 0) && (SDL_strlen(audiodev) < (sizeof(audiopath)-3)) ) { |
| 0 | 77 int exists, instance; |
| 78 struct stat sb; | |
| 79 | |
| 80 instance = 1; | |
| 81 do { /* Don't use errno ENOENT - it may not be thread-safe */ | |
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82 SDL_snprintf(audiopath, SDL_arraysize(audiopath), |
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83 "%s%d", audiodev, instance++); |
| 0 | 84 exists = 0; |
| 85 if ( stat(audiopath, &sb) == 0 ) { | |
| 86 exists = 1; | |
| 87 audio_fd = open(audiopath, flags, 0); | |
| 88 } | |
| 89 } while ( exists && (audio_fd < 0) ); | |
| 90 audiodev = audiopath; | |
| 91 } | |
| 92 if ( path != NULL ) { | |
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93 SDL_strlcpy(path, audiodev, maxlen); |
| 0 | 94 path[maxlen-1] = '\0'; |
| 95 } | |
| 96 return(audio_fd); | |
| 97 } | |
| 98 | |
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99 #elif SDL_AUDIO_DRIVER_PAUD |
| 0 | 100 |
| 101 /* Get the name of the audio device we use for output */ | |
| 102 | |
| 103 #include <sys/types.h> | |
| 104 #include <sys/stat.h> | |
| 105 | |
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106 #include "SDL_stdinc.h" |
| 0 | 107 #include "SDL_audiodev_c.h" |
| 108 | |
| 109 #ifndef _PATH_DEV_DSP | |
| 110 #define _PATH_DEV_DSP "/dev/%caud%c/%c" | |
| 111 #endif | |
| 112 | |
| 113 char devsettings[][3] = | |
| 114 { | |
| 115 { 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' }, | |
| 116 { 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' }, | |
| 117 { 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' }, | |
| 118 { 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' }, | |
| 119 { 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' }, | |
| 120 { 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' }, | |
| 121 { 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' }, | |
| 122 { 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' }, | |
| 123 { '\0', '\0', '\0' } | |
| 124 }; | |
| 125 | |
| 126 static int OpenUserDefinedDevice(char *path, int maxlen, int flags) | |
| 127 { | |
| 128 const char *audiodev; | |
| 129 int audio_fd; | |
| 130 | |
| 131 /* Figure out what our audio device is */ | |
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132 if ((audiodev=SDL_getenv("SDL_PATH_DSP")) == NULL) { |
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133 audiodev=SDL_getenv("AUDIODEV"); |
| 0 | 134 } |
| 135 if ( audiodev == NULL ) { | |
| 136 return -1; | |
| 137 } | |
| 138 audio_fd = open(audiodev, flags, 0); | |
| 139 if ( path != NULL ) { | |
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140 SDL_strlcpy(path, audiodev, maxlen); |
| 0 | 141 path[maxlen-1] = '\0'; |
| 142 } | |
| 143 return audio_fd; | |
| 144 } | |
| 145 | |
| 146 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic) | |
| 147 { | |
| 148 struct stat sb; | |
| 149 int audio_fd; | |
| 150 char audiopath[1024]; | |
| 151 int cycle; | |
| 152 | |
| 153 audio_fd = OpenUserDefinedDevice(path,maxlen,flags); | |
| 154 if ( audio_fd != -1 ) { | |
| 155 return audio_fd; | |
| 156 } | |
| 157 | |
| 158 cycle = 0; | |
| 159 while( devsettings[cycle][0] != '\0' ) { | |
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160 SDL_snprintf( audiopath, SDL_arraysize(audiopath), |
| 0 | 161 _PATH_DEV_DSP, |
| 162 devsettings[cycle][0], | |
| 163 devsettings[cycle][1], | |
| 164 devsettings[cycle][2]); | |
| 165 | |
| 166 if ( stat(audiopath, &sb) == 0 ) { | |
| 167 audio_fd = open(audiopath, flags, 0); | |
| 168 if ( audio_fd > 0 ) { | |
| 169 if ( path != NULL ) { | |
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170 SDL_strlcpy( path, audiopath, maxlen ); |
| 0 | 171 } |
| 172 return audio_fd; | |
| 173 } | |
| 174 } | |
| 175 } | |
| 176 return -1; | |
| 177 } | |
| 178 | |
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179 #endif /* Audio driver selection */ |