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annotate src/audio/paudio/SDL_paudio.c @ 3809:7852b5b78af5 SDL-ryan-multiple-audio-device

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Cleaning out SDL_audiodev.c and related references ...
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Oct 2006 01:13:47 +0000
parents c8b3d3d13ed1
children ca74a71063ac
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Carsten Griwodz
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20 griff@kom.tu-darmstadt.de
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21
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22 based on linux/SDL_dspaudio.c by Sam Lantinga
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23 */
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24 #include "SDL_config.h"
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25
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26 /* Allow access to a raw mixing buffer */
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27
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28 #include <errno.h>
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29 #include <unistd.h>
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30 #include <fcntl.h>
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31 #include <sys/time.h>
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32 #include <sys/ioctl.h>
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33 #include <sys/types.h>
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34 #include <sys/stat.h>
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35
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36 #include "SDL_timer.h"
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37 #include "SDL_audio.h"
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38 #include "SDL_stdinc.h"
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39 #include "../SDL_audiomem.h"
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40 #include "../SDL_audio_c.h"
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41 #include "SDL_paudio.h"
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42
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43 #define DEBUG_AUDIO 1
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44
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45 /* A conflict within AIX 4.3.3 <sys/> headers and probably others as well.
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46 * I guess nobody ever uses audio... Shame over AIX header files. */
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47 #include <sys/machine.h>
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48 #undef BIG_ENDIAN
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49 #include <sys/audio.h>
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50
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51 /* The tag name used by paud audio */
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52 #define Paud_DRIVER_NAME "paud"
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53
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54 /* Open the audio device for playback, and don't block if busy */
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55 /* #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) */
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56 #define OPEN_FLAGS O_WRONLY
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57
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58 /* Audio driver functions */
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59 static int Paud_OpenAudio(_THIS, SDL_AudioSpec * spec);
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60 static void Paud_WaitAudio(_THIS);
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61 static void Paud_PlayAudio(_THIS);
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62 static Uint8 *Paud_GetAudioBuf(_THIS);
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63 static void Paud_CloseAudio(_THIS);
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64
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65
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66 /* Get the name of the audio device we use for output */
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67
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68 #ifndef _PATH_DEV_DSP
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69 #define _PATH_DEV_DSP "/dev/%caud%c/%c"
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70 #endif
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71
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72 static char devsettings[][3] = {
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73 {'p', '0', '1'}, {'p', '0', '2'}, {'p', '0', '3'}, {'p', '0', '4'},
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74 {'p', '1', '1'}, {'p', '1', '2'}, {'p', '1', '3'}, {'p', '1', '4'},
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75 {'p', '2', '1'}, {'p', '2', '2'}, {'p', '2', '3'}, {'p', '2', '4'},
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76 {'p', '3', '1'}, {'p', '3', '2'}, {'p', '3', '3'}, {'p', '3', '4'},
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77 {'b', '0', '1'}, {'b', '0', '2'}, {'b', '0', '3'}, {'b', '0', '4'},
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78 {'b', '1', '1'}, {'b', '1', '2'}, {'b', '1', '3'}, {'b', '1', '4'},
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79 {'b', '2', '1'}, {'b', '2', '2'}, {'b', '2', '3'}, {'b', '2', '4'},
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80 {'b', '3', '1'}, {'b', '3', '2'}, {'b', '3', '3'}, {'b', '3', '4'},
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81 {'\0', '\0', '\0'}
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82 };
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83
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84 static int
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85 OpenUserDefinedDevice(char *path, int maxlen, int flags)
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86 {
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87 const char *audiodev;
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88 int audio_fd;
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89
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90 /* Figure out what our audio device is */
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91 if ((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) {
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92 audiodev = SDL_getenv("AUDIODEV");
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93 }
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94 if (audiodev == NULL) {
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95 return -1;
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96 }
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97 audio_fd = open(audiodev, flags, 0);
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98 if (path != NULL) {
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99 SDL_strlcpy(path, audiodev, maxlen);
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100 path[maxlen - 1] = '\0';
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101 }
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102 return audio_fd;
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103 }
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104
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105 int
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106 OpenAudioPath(char *path, int maxlen, int flags, int classic)
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107 {
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108 struct stat sb;
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109 int audio_fd;
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110 char audiopath[1024];
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111 int cycle;
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112
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113 audio_fd = OpenUserDefinedDevice(path, maxlen, flags);
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114 if (audio_fd != -1) {
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115 return audio_fd;
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116 }
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117
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118 cycle = 0;
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119 /* !!! FIXME: do we really need a table here? */
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120 while (devsettings[cycle][0] != '\0') {
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121 SDL_snprintf(audiopath, SDL_arraysize(audiopath),
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122 _PATH_DEV_DSP,
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123 devsettings[cycle][0],
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124 devsettings[cycle][1], devsettings[cycle][2]);
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125
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126 if (stat(audiopath, &sb) == 0) {
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127 audio_fd = open(audiopath, flags, 0);
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128 if (audio_fd > 0) {
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129 if (path != NULL) {
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130 SDL_strlcpy(path, audiopath, maxlen);
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131 }
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132 return audio_fd;
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133 }
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134 }
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135 }
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136 return -1;
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137 }
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138
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139
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140 /* Audio driver bootstrap functions */
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141
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142 static int
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143 Audio_Available(void)
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144 {
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145 int fd;
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146 int available;
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147
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148 available = 0;
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149 fd = OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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150 if (fd >= 0) {
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151 available = 1;
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152 close(fd);
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153 }
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154 return (available);
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155 }
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156
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157 static void
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158 Audio_DeleteDevice(SDL_AudioDevice * device)
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159 {
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160 SDL_free(device->hidden);
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161 SDL_free(device);
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162 }
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163
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164 static SDL_AudioDevice *
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165 Audio_CreateDevice(int devindex)
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166 {
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167 SDL_AudioDevice *this;
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168
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169 /* Initialize all variables that we clean on shutdown */
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170 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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171 if (this) {
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172 SDL_memset(this, 0, (sizeof *this));
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173 this->hidden = (struct SDL_PrivateAudioData *)
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174 SDL_malloc((sizeof *this->hidden));
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175 }
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176 if ((this == NULL) || (this->hidden == NULL)) {
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177 SDL_OutOfMemory();
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178 if (this) {
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179 SDL_free(this);
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180 }
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181 return (0);
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182 }
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183 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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184 audio_fd = -1;
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185
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186 /* Set the function pointers */
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187 this->OpenAudio = Paud_OpenAudio;
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188 this->WaitAudio = Paud_WaitAudio;
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189 this->PlayAudio = Paud_PlayAudio;
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190 this->GetAudioBuf = Paud_GetAudioBuf;
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191 this->CloseAudio = Paud_CloseAudio;
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192
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193 this->free = Audio_DeleteDevice;
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194
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195 return this;
0
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196 }
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197
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198 AudioBootStrap Paud_bootstrap = {
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199 Paud_DRIVER_NAME, "AIX Paudio",
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200 Audio_Available, Audio_CreateDevice, 0
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201 };
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202
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203 /* This function waits until it is possible to write a full sound buffer */
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204 static void
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205 Paud_WaitAudio(_THIS)
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206 {
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207 fd_set fdset;
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208
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209 /* See if we need to use timed audio synchronization */
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210 if (frame_ticks) {
0
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211 /* Use timer for general audio synchronization */
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212 Sint32 ticks;
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213
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214 ticks = ((Sint32) (next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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215 if (ticks > 0) {
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216 SDL_Delay(ticks);
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217 }
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218 } else {
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219 audio_buffer paud_bufinfo;
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220
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221 /* Use select() for audio synchronization */
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222 struct timeval timeout;
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223 FD_ZERO(&fdset);
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224 FD_SET(audio_fd, &fdset);
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225
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226 if (ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0) {
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227 #ifdef DEBUG_AUDIO
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228 fprintf(stderr, "Couldn't get audio buffer information\n");
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229 #endif
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230 timeout.tv_sec = 10;
0
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231 timeout.tv_usec = 0;
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232 } else {
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233 long ms_in_buf = paud_bufinfo.write_buf_time;
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234 timeout.tv_sec = ms_in_buf / 1000;
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235 ms_in_buf = ms_in_buf - timeout.tv_sec * 1000;
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236 timeout.tv_usec = ms_in_buf * 1000;
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237 #ifdef DEBUG_AUDIO
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238 fprintf(stderr,
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239 "Waiting for write_buf_time=%ld,%ld\n",
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240 timeout.tv_sec, timeout.tv_usec);
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241 #endif
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242 }
0
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243
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244 #ifdef DEBUG_AUDIO
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245 fprintf(stderr, "Waiting for audio to get ready\n");
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246 #endif
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247 if (select(audio_fd + 1, NULL, &fdset, NULL, &timeout) <= 0) {
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248 const char *message =
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249 "Audio timeout - buggy audio driver? (disabled)";
0
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250 /*
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251 * In general we should never print to the screen,
0
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252 * but in this case we have no other way of letting
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253 * the user know what happened.
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254 */
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255 fprintf(stderr, "SDL: %s - %s\n", strerror(errno), message);
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256 this->enabled = 0;
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257 /* Don't try to close - may hang */
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258 audio_fd = -1;
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259 #ifdef DEBUG_AUDIO
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260 fprintf(stderr, "Done disabling audio\n");
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261 #endif
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262 }
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263 #ifdef DEBUG_AUDIO
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264 fprintf(stderr, "Ready!\n");
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265 #endif
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266 }
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267 }
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268
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269 static void
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270 Paud_PlayAudio(_THIS)
0
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271 {
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272 int written;
0
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273
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274 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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275 do {
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276 written = write(audio_fd, mixbuf, mixlen);
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277 if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
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278 SDL_Delay(1); /* Let a little CPU time go by */
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279 }
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280 }
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281 while ((written < 0) &&
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282 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
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283
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284 /* If timer synchronization is enabled, set the next write frame */
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285 if (frame_ticks) {
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286 next_frame += frame_ticks;
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287 }
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288
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289 /* If we couldn't write, assume fatal error for now */
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290 if (written < 0) {
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291 this->enabled = 0;
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292 }
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293 #ifdef DEBUG_AUDIO
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294 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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295 #endif
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296 }
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297
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298 static Uint8 *
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299 Paud_GetAudioBuf(_THIS)
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300 {
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301 return mixbuf;
0
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302 }
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303
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304 static void
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305 Paud_CloseAudio(_THIS)
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306 {
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307 if (mixbuf != NULL) {
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308 SDL_FreeAudioMem(mixbuf);
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309 mixbuf = NULL;
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310 }
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311 if (audio_fd >= 0) {
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312 close(audio_fd);
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313 audio_fd = -1;
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314 }
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315 }
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316
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317 static int
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318 Paud_OpenAudio(_THIS, SDL_AudioSpec * spec)
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319 {
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320 char audiodev[1024];
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321 int format;
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322 int bytes_per_sample;
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3b4ce57c6215 First shot at new audio data types (int32 and float32).
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323 SDL_AudioFormat test_format;
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324 audio_init paud_init;
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325 audio_buffer paud_bufinfo;
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326 audio_status paud_status;
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327 audio_control paud_control;
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328 audio_change paud_change;
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329
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330 /* Reset the timer synchronization flag */
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331 frame_ticks = 0.0;
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332
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333 /* Open the audio device */
3809
7852b5b78af5 Cleaning out SDL_audiodev.c and related references ...
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334 audio_fd = OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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335 if (audio_fd < 0) {
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336 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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337 return -1;
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338 }
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339
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340 /*
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341 * We can't set the buffer size - just ask the device for the maximum
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342 * that we can have.
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343 */
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344 if (ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0) {
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345 SDL_SetError("Couldn't get audio buffer information");
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346 return -1;
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347 }
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348
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349 mixbuf = NULL;
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350
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351 if (spec->channels > 1)
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352 spec->channels = 2;
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353 else
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354 spec->channels = 1;
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355
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356 /*
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357 * Fields in the audio_init structure:
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358 *
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359 * Ignored by us:
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360 *
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361 * paud.loadpath[LOAD_PATH]; * DSP code to load, MWave chip only?
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362 * paud.slot_number; * slot number of the adapter
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363 * paud.device_id; * adapter identification number
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364 *
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365 * Input:
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366 *
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367 * paud.srate; * the sampling rate in Hz
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368 * paud.bits_per_sample; * 8, 16, 32, ...
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369 * paud.bsize; * block size for this rate
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370 * paud.mode; * ADPCM, PCM, MU_LAW, A_LAW, SOURCE_MIX
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371 * paud.channels; * 1=mono, 2=stereo
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372 * paud.flags; * FIXED - fixed length data
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373 * * LEFT_ALIGNED, RIGHT_ALIGNED (var len only)
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374 * * TWOS_COMPLEMENT - 2's complement data
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375 * * SIGNED - signed? comment seems wrong in sys/audio.h
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376 * * BIG_ENDIAN
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377 * paud.operation; * PLAY, RECORD
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378 *
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379 * Output:
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380 *
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381 * paud.flags; * PITCH - pitch is supported
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382 * * INPUT - input is supported
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383 * * OUTPUT - output is supported
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384 * * MONITOR - monitor is supported
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385 * * VOLUME - volume is supported
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386 * * VOLUME_DELAY - volume delay is supported
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387 * * BALANCE - balance is supported
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388 * * BALANCE_DELAY - balance delay is supported
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389 * * TREBLE - treble control is supported
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390 * * BASS - bass control is supported
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391 * * BESTFIT_PROVIDED - best fit returned
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392 * * LOAD_CODE - DSP load needed
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393 * paud.rc; * NO_PLAY - DSP code can't do play requests
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394 * * NO_RECORD - DSP code can't do record requests
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395 * * INVALID_REQUEST - request was invalid
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396 * * CONFLICT - conflict with open's flags
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397 * * OVERLOADED - out of DSP MIPS or memory
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398 * paud.position_resolution; * smallest increment for position
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399 */
0
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400
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401 paud_init.srate = spec->freq;
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402 paud_init.mode = PCM;
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403 paud_init.operation = PLAY;
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diff changeset
404 paud_init.channels = spec->channels;
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diff changeset
405
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diff changeset
406 /* Try for a closest match on audio format */
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diff changeset
407 format = 0;
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diff changeset
408 for (test_format = SDL_FirstAudioFormat(spec->format);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
409 !format && test_format;) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 #ifdef DEBUG_AUDIO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
411 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
413 switch (test_format) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
414 case AUDIO_U8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
415 bytes_per_sample = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
416 paud_init.bits_per_sample = 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
417 paud_init.flags = TWOS_COMPLEMENT | FIXED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
418 format = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
419 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
420 case AUDIO_S8:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
421 bytes_per_sample = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
422 paud_init.bits_per_sample = 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
423 paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
424 format = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
425 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
426 case AUDIO_S16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
427 bytes_per_sample = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
428 paud_init.bits_per_sample = 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
429 paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
430 format = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
431 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
432 case AUDIO_S16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
433 bytes_per_sample = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
434 paud_init.bits_per_sample = 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
435 paud_init.flags = BIG_ENDIAN | SIGNED | TWOS_COMPLEMENT | FIXED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
436 format = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
437 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
438 case AUDIO_U16LSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
439 bytes_per_sample = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
440 paud_init.bits_per_sample = 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
441 paud_init.flags = TWOS_COMPLEMENT | FIXED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
442 format = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
443 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
444 case AUDIO_U16MSB:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
445 bytes_per_sample = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
446 paud_init.bits_per_sample = 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
447 paud_init.flags = BIG_ENDIAN | TWOS_COMPLEMENT | FIXED;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
448 format = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
449 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
450 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
451 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
452 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
453 if (!format) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
454 test_format = SDL_NextAudioFormat();
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
455 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
456 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
457 if (format == 0) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 #ifdef DEBUG_AUDIO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
459 fprintf(stderr, "Couldn't find any hardware audio formats\n");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
461 SDL_SetError("Couldn't find any hardware audio formats");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
462 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
463 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
464 spec->format = test_format;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
466 /*
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
467 * We know the buffer size and the max number of subsequent writes
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
468 * that can be pending. If more than one can pend, allow the application
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
469 * to do something like double buffering between our write buffer and
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
470 * the device's own buffer that we are filling with write() anyway.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
471 *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
472 * We calculate spec->samples like this because SDL_CalculateAudioSpec()
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
473 * will give put paud_bufinfo.write_buf_cap (or paud_bufinfo.write_buf_cap/2)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
474 * into spec->size in return.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
475 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
476 if (paud_bufinfo.request_buf_cap == 1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
477 spec->samples = paud_bufinfo.write_buf_cap
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
478 / bytes_per_sample / spec->channels;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
479 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
480 spec->samples = paud_bufinfo.write_buf_cap
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
481 / bytes_per_sample / spec->channels / 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
482 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
483 paud_init.bsize = bytes_per_sample * spec->channels;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
485 SDL_CalculateAudioSpec(spec);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
486
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
487 /*
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
488 * The AIX paud device init can't modify the values of the audio_init
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
489 * structure that we pass to it. So we don't need any recalculation
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
490 * of this stuff and no reinit call as in linux dsp and dma code.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
491 *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
492 * /dev/paud supports all of the encoding formats, so we don't need
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
493 * to do anything like reopening the device, either.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
494 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
495 if (ioctl(audio_fd, AUDIO_INIT, &paud_init) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
496 switch (paud_init.rc) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
497 case 1:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
498 SDL_SetError
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
499 ("Couldn't set audio format: DSP can't do play requests");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
500 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
501 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
502 case 2:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
503 SDL_SetError
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
504 ("Couldn't set audio format: DSP can't do record requests");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
505 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
506 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
507 case 4:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
508 SDL_SetError("Couldn't set audio format: request was invalid");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
509 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
510 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
511 case 5:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
512 SDL_SetError
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
513 ("Couldn't set audio format: conflict with open's flags");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
514 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
515 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
516 case 6:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
517 SDL_SetError
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
518 ("Couldn't set audio format: out of DSP MIPS or memory");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
519 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
520 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
521 default:
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
522 SDL_SetError
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
523 ("Couldn't set audio format: not documented in sys/audio.h");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
524 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
525 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
526 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
527 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
528
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
529 /* Allocate mixing buffer */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
530 mixlen = spec->size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
531 mixbuf = (Uint8 *) SDL_AllocAudioMem(mixlen);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
532 if (mixbuf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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533 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
534 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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535 SDL_memset(mixbuf, spec->silence, spec->size);
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parents:
diff changeset
536
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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537 /*
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
538 * Set some paramters: full volume, first speaker that we can find.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
539 * Ignore the other settings for now.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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540 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
541 paud_change.input = AUDIO_IGNORE; /* the new input source */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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542 paud_change.output = OUTPUT_1; /* EXTERNAL_SPEAKER,INTERNAL_SPEAKER,OUTPUT_1 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
543 paud_change.monitor = AUDIO_IGNORE; /* the new monitor state */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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544 paud_change.volume = 0x7fffffff; /* volume level [0-0x7fffffff] */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
545 paud_change.volume_delay = AUDIO_IGNORE; /* the new volume delay */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
546 paud_change.balance = 0x3fffffff; /* the new balance */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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547 paud_change.balance_delay = AUDIO_IGNORE; /* the new balance delay */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
548 paud_change.treble = AUDIO_IGNORE; /* the new treble state */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
549 paud_change.bass = AUDIO_IGNORE; /* the new bass state */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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550 paud_change.pitch = AUDIO_IGNORE; /* the new pitch state */
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74212992fb08 Initial revision
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diff changeset
551
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
552 paud_control.ioctl_request = AUDIO_CHANGE;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
553 paud_control.request_info = (char *) &paud_change;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
554 if (ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
555 #ifdef DEBUG_AUDIO
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
556 fprintf(stderr, "Can't change audio display settings\n");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
557 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
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558 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
559
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
560 /*
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
561 * Tell the device to expect data. Actual start will wait for
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
562 * the first write() call.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
563 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
564 paud_control.ioctl_request = AUDIO_START;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
565 paud_control.position = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
566 if (ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
567 #ifdef DEBUG_AUDIO
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
568 fprintf(stderr, "Can't start audio play\n");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
569 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
570 SDL_SetError("Can't start audio play");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
571 return -1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
572 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
573
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
574 /* Check to see if we need to use select() workaround */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
575 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
576 char *workaround;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
577 workaround = SDL_getenv("SDL_DSP_NOSELECT");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
578 if (workaround) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
579 frame_ticks = (float) (spec->samples * 1000) / spec->freq;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
580 next_frame = SDL_GetTicks() + frame_ticks;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
581 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
582 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
583
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
584 /* Get the parent process id (we're the parent of the audio thread) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
585 parent = getpid();
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
586
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
587 /* We're ready to rock and roll. :-) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
588 return 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
589 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
590
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
591 /* vi: set ts=4 sw=4 expandtab: */