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annotate src/audio/SDL_audiodev.c @ 5213:1be088cec098

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At least allow returning the values that were set.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 06 Feb 2011 10:24:08 -0800
parents ba9ac6bb0c75
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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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
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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.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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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
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Get the name of the audio device we use for output */
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25
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26 #if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
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27
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28 #include <fcntl.h>
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29 #include <sys/types.h>
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30 #include <sys/stat.h>
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31 #include <unistd.h> /* For close() */
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32
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33 #include "SDL_stdinc.h"
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34 #include "SDL_audiodev_c.h"
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35
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36 #ifndef _PATH_DEV_DSP
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37 #if defined(__NETBSD__) || defined(__OPENBSD__)
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38 #define _PATH_DEV_DSP "/dev/audio"
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39 #else
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40 #define _PATH_DEV_DSP "/dev/dsp"
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41 #endif
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42 #endif
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43 #ifndef _PATH_DEV_DSP24
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44 #define _PATH_DEV_DSP24 "/dev/sound/dsp"
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45 #endif
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46 #ifndef _PATH_DEV_AUDIO
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47 #define _PATH_DEV_AUDIO "/dev/audio"
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48 #endif
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49
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50 static inline void
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51 test_device(const char *fname, int flags, int (*test) (int fd),
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52 char ***devices, int *devCount)
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53 {
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54 struct stat sb;
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55 if ((stat(fname, &sb) == 0) && (S_ISCHR(sb.st_mode))) {
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56 int audio_fd = open(fname, flags, 0);
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57 if ((audio_fd >= 0) && (test(audio_fd))) {
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58 void *p =
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59 SDL_realloc(*devices, ((*devCount) + 1) * sizeof(char *));
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60 if (p != NULL) {
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61 size_t len = strlen(fname) + 1;
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62 char *str = (char *) SDL_malloc(len);
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63 *devices = (char **) p;
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64 if (str != NULL) {
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65 SDL_strlcpy(str, fname, len);
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66 (*devices)[(*devCount)++] = str;
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67 }
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68 }
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69 close(audio_fd);
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70 }
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71 }
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72 }
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73
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74 void
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75 SDL_FreeUnixAudioDevices(char ***devices, int *devCount)
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76 {
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77 int i = *devCount;
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78 if ((i > 0) && (*devices != NULL)) {
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79 while (i--) {
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80 SDL_free((*devices)[i]);
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81 }
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82 }
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83
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84 if (*devices != NULL) {
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85 SDL_free(*devices);
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86 }
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87
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88 *devices = NULL;
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89 *devCount = 0;
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90 }
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91
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92 static int
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93 test_stub(int fd)
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94 {
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95 return 1;
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96 }
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97
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98 void
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99 SDL_EnumUnixAudioDevices(int flags, int classic, int (*test) (int fd),
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100 char ***devices, int *devCount)
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101 {
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102 const char *audiodev;
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103 char audiopath[1024];
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104
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105 if (test == NULL)
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106 test = test_stub;
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107
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108 /* Figure out what our audio device is */
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109 if (((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) &&
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110 ((audiodev = SDL_getenv("AUDIODEV")) == NULL)) {
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111 if (classic) {
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112 audiodev = _PATH_DEV_AUDIO;
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113 } else {
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114 struct stat sb;
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115
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116 /* Added support for /dev/sound/\* in Linux 2.4 */
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117 if (((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode))
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118 && ((stat(_PATH_DEV_DSP24, &sb) == 0)
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119 && S_ISCHR(sb.st_mode))) {
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120 audiodev = _PATH_DEV_DSP24;
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121 } else {
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122 audiodev = _PATH_DEV_DSP;
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123 }
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124 }
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125 }
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126 test_device(audiodev, flags, test, devices, devCount);
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127
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128 if (SDL_strlen(audiodev) < (sizeof(audiopath) - 3)) {
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129 int instance = 0;
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130 while (instance++ <= 64) {
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131 SDL_snprintf(audiopath, SDL_arraysize(audiopath),
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132 "%s%d", audiodev, instance);
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133 test_device(audiopath, flags, test, devices, devCount);
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134 }
0
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135 }
74212992fb08 Initial revision
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136 }
74212992fb08 Initial revision
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137
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d910939febfa Use consistent identifiers for the various platforms we support.
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138 #endif /* Audio driver selection */
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139 /* vi: set ts=4 sw=4 expandtab: */