annotate src/audio/dma/SDL_dmaaudio.c @ 1361:19418e4422cb

New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
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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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Allow access to a raw mixing buffer */
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24
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25 #include <stdio.h>
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26 #include <string.h> /* For strerror() */
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27 #include <errno.h>
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28 #include <unistd.h>
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29 #include <fcntl.h>
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30 #include <signal.h>
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31 #include <sys/types.h>
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32 #include <sys/time.h>
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33 #include <sys/ioctl.h>
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34 #include <sys/stat.h>
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35 #include <sys/mman.h>
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36
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37 #include "SDL_config.h"
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38
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39 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H
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40 /* This is installed on some systems */
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41 #include <soundcard.h>
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42 #else
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43 /* This is recommended by OSS */
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44 #include <sys/soundcard.h>
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45 #endif
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46
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47 #ifndef MAP_FAILED
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48 #define MAP_FAILED ((Uint8 *)-1)
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49 #endif
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50
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51 #include "SDL_timer.h"
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52 #include "SDL_audio.h"
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53 #include "../SDL_audio_c.h"
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54 #include "../SDL_audiodev_c.h"
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55 #include "SDL_dmaaudio.h"
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56
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57 /* The tag name used by DMA audio */
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58 #define DMA_DRIVER_NAME "dma"
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59
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60 /* Open the audio device for playback, and don't block if busy */
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61 #define OPEN_FLAGS (O_RDWR|O_NONBLOCK)
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62
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63 /* Audio driver functions */
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64 static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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65 static void DMA_WaitAudio(_THIS);
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66 static void DMA_PlayAudio(_THIS);
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67 static Uint8 *DMA_GetAudioBuf(_THIS);
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68 static void DMA_CloseAudio(_THIS);
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69
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70 /* Audio driver bootstrap functions */
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71
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72 static int Audio_Available(void)
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73 {
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74 int available;
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75 int fd;
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76
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77 available = 0;
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78
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79 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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80 if ( fd >= 0 ) {
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81 int caps;
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82 struct audio_buf_info info;
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83
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84 if ( (ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) &&
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85 (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) &&
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86 (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0) ) {
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87 available = 1;
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88 }
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89 close(fd);
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90 }
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91 return(available);
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92 }
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93
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94 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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95 {
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96 SDL_free(device->hidden);
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97 SDL_free(device);
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98 }
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99
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100 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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101 {
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102 SDL_AudioDevice *this;
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103
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104 /* Initialize all variables that we clean on shutdown */
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105 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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106 if ( this ) {
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107 SDL_memset(this, 0, (sizeof *this));
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108 this->hidden = (struct SDL_PrivateAudioData *)
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109 SDL_malloc((sizeof *this->hidden));
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110 }
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111 if ( (this == NULL) || (this->hidden == NULL) ) {
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112 SDL_OutOfMemory();
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113 if ( this ) {
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114 SDL_free(this);
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115 }
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116 return(0);
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117 }
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118 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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119 audio_fd = -1;
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120
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121 /* Set the function pointers */
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122 this->OpenAudio = DMA_OpenAudio;
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123 this->WaitAudio = DMA_WaitAudio;
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124 this->PlayAudio = DMA_PlayAudio;
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125 this->GetAudioBuf = DMA_GetAudioBuf;
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126 this->CloseAudio = DMA_CloseAudio;
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127
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128 this->free = Audio_DeleteDevice;
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129
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130 return this;
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131 }
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132
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133 AudioBootStrap DMA_bootstrap = {
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134 DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio",
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135 Audio_Available, Audio_CreateDevice
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136 };
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137
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138 /* This function waits until it is possible to write a full sound buffer */
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139 static void DMA_WaitAudio(_THIS)
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140 {
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141 fd_set fdset;
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142
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143 /* Check to see if the thread-parent process is still alive */
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144 { static int cnt = 0;
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145 /* Note that this only works with thread implementations
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146 that use a different process id for each thread.
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147 */
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148 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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149 if ( kill(parent, 0) < 0 ) {
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150 this->enabled = 0;
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151 }
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152 }
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153 }
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154
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155 /* See if we need to use timed audio synchronization */
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156 if ( frame_ticks ) {
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157 /* Use timer for general audio synchronization */
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158 Sint32 ticks;
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159
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160 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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161 if ( ticks > 0 ) {
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162 SDL_Delay(ticks);
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163 }
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164 } else {
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165 /* Use select() for audio synchronization */
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166 struct timeval timeout;
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167 FD_ZERO(&fdset);
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168 FD_SET(audio_fd, &fdset);
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169 timeout.tv_sec = 10;
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170 timeout.tv_usec = 0;
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171 #ifdef DEBUG_AUDIO
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172 fprintf(stderr, "Waiting for audio to get ready\n");
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173 #endif
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174 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) {
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175 const char *message =
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176 #ifdef AUDIO_OSPACE_HACK
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177 "Audio timeout - buggy audio driver? (trying ospace)";
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178 #else
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179 "Audio timeout - buggy audio driver? (disabled)";
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180 #endif
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181 /* In general we should never print to the screen,
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182 but in this case we have no other way of letting
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183 the user know what happened.
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184 */
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185 fprintf(stderr, "SDL: %s\n", message);
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186 #ifdef AUDIO_OSPACE_HACK
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187 /* We may be able to use GET_OSPACE trick */
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188 frame_ticks = (float)(this->spec->samples*1000) /
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189 this->spec->freq;
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190 next_frame = SDL_GetTicks()+frame_ticks;
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191 #else
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192 this->enabled = 0;
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193 /* Don't try to close - may hang */
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194 audio_fd = -1;
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195 #ifdef DEBUG_AUDIO
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196 fprintf(stderr, "Done disabling audio\n");
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197 #endif
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198 #endif /* AUDIO_OSPACE_HACK */
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199 }
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200 #ifdef DEBUG_AUDIO
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201 fprintf(stderr, "Ready!\n");
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202 #endif
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203 }
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204 }
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205
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206 static void DMA_PlayAudio(_THIS)
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207 {
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208 /* If timer synchronization is enabled, set the next write frame */
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209 if ( frame_ticks ) {
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210 next_frame += frame_ticks;
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211 }
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212 return;
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213 }
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214
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215 static Uint8 *DMA_GetAudioBuf(_THIS)
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216 {
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217 count_info info;
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218 int playing;
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219 int filling;
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diff changeset
220
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diff changeset
221 /* Get number of blocks, looping if we're not using select() */
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222 do {
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223 if ( ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0 ) {
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224 /* Uh oh... */
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225 this->enabled = 0;
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diff changeset
226 return(NULL);
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diff changeset
227 }
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228 } while ( frame_ticks && (info.blocks < 1) );
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229 #ifdef DEBUG_AUDIO
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diff changeset
230 if ( info.blocks > 1 ) {
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diff changeset
231 printf("Warning: audio underflow (%d frags)\n", info.blocks-1);
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232 }
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diff changeset
233 #endif
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234 playing = info.ptr / this->spec.size;
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235 filling = (playing + 1)%num_buffers;
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236 return (dma_buf + (filling * this->spec.size));
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237 }
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238
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parents:
diff changeset
239 static void DMA_CloseAudio(_THIS)
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parents:
diff changeset
240 {
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parents:
diff changeset
241 if ( dma_buf != NULL ) {
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diff changeset
242 munmap(dma_buf, dma_len);
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diff changeset
243 dma_buf = NULL;
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244 }
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245 if ( audio_fd >= 0 ) {
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diff changeset
246 close(audio_fd);
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diff changeset
247 audio_fd = -1;
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248 }
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249 }
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diff changeset
250
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diff changeset
251 static int DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo,
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252 SDL_AudioSpec *spec)
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253 {
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254 int frag_spec;
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diff changeset
255 int value;
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parents:
diff changeset
256
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parents:
diff changeset
257 /* Close and then reopen the audio device */
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parents:
diff changeset
258 close(audio_fd);
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diff changeset
259 audio_fd = open(audiodev, O_RDWR, 0);
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diff changeset
260 if ( audio_fd < 0 ) {
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diff changeset
261 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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diff changeset
262 return(-1);
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parents:
diff changeset
263 }
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parents:
diff changeset
264
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parents:
diff changeset
265 /* Calculate the final parameters for this audio specification */
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diff changeset
266 SDL_CalculateAudioSpec(spec);
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parents:
diff changeset
267
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parents:
diff changeset
268 /* Determine the power of two of the fragment size */
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parents:
diff changeset
269 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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parents:
diff changeset
270 if ( (0x01<<frag_spec) != spec->size ) {
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parents:
diff changeset
271 SDL_SetError("Fragment size must be a power of two");
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parents:
diff changeset
272 return(-1);
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parents:
diff changeset
273 }
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parents:
diff changeset
274
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parents:
diff changeset
275 /* Set the audio buffering parameters */
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parents:
diff changeset
276 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
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parents:
diff changeset
277 SDL_SetError("Couldn't set audio fragment spec");
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parents:
diff changeset
278 return(-1);
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parents:
diff changeset
279 }
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parents:
diff changeset
280
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parents:
diff changeset
281 /* Set the audio format */
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parents:
diff changeset
282 value = format;
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parents:
diff changeset
283 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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parents:
diff changeset
284 (value != format) ) {
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parents:
diff changeset
285 SDL_SetError("Couldn't set audio format");
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parents:
diff changeset
286 return(-1);
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parents:
diff changeset
287 }
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parents:
diff changeset
288
74212992fb08 Initial revision
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parents:
diff changeset
289 /* Set mono or stereo audio */
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parents:
diff changeset
290 value = (spec->channels > 1);
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parents:
diff changeset
291 if ( (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) ||
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parents:
diff changeset
292 (value != stereo) ) {
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parents:
diff changeset
293 SDL_SetError("Couldn't set audio channels");
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diff changeset
294 return(-1);
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parents:
diff changeset
295 }
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parents:
diff changeset
296
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parents:
diff changeset
297 /* Set the DSP frequency */
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parents:
diff changeset
298 value = spec->freq;
960
eec28a5278be Date: Sat, 9 Oct 2004 02:46:18 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
299 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
0
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parents:
diff changeset
300 SDL_SetError("Couldn't set audio frequency");
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parents:
diff changeset
301 return(-1);
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parents:
diff changeset
302 }
74212992fb08 Initial revision
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parents:
diff changeset
303 spec->freq = value;
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parents:
diff changeset
304
74212992fb08 Initial revision
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parents:
diff changeset
305 /* We successfully re-opened the audio */
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parents:
diff changeset
306 return(0);
74212992fb08 Initial revision
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parents:
diff changeset
307 }
74212992fb08 Initial revision
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parents:
diff changeset
308
74212992fb08 Initial revision
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parents:
diff changeset
309 static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec)
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parents:
diff changeset
310 {
74212992fb08 Initial revision
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parents:
diff changeset
311 char audiodev[1024];
74212992fb08 Initial revision
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parents:
diff changeset
312 int format;
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parents:
diff changeset
313 int stereo;
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parents:
diff changeset
314 int value;
74212992fb08 Initial revision
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parents:
diff changeset
315 Uint16 test_format;
74212992fb08 Initial revision
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parents:
diff changeset
316 struct audio_buf_info info;
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parents:
diff changeset
317
74212992fb08 Initial revision
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parents:
diff changeset
318 /* Reset the timer synchronization flag */
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parents:
diff changeset
319 frame_ticks = 0.0;
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parents:
diff changeset
320
74212992fb08 Initial revision
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parents:
diff changeset
321 /* Open the audio device */
74212992fb08 Initial revision
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parents:
diff changeset
322 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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parents:
diff changeset
323 if ( audio_fd < 0 ) {
74212992fb08 Initial revision
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parents:
diff changeset
324 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
74212992fb08 Initial revision
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parents:
diff changeset
325 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
326 }
74212992fb08 Initial revision
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parents:
diff changeset
327 dma_buf = NULL;
74212992fb08 Initial revision
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parents:
diff changeset
328 ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
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parents:
diff changeset
329
74212992fb08 Initial revision
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parents:
diff changeset
330 /* Get a list of supported hardware formats */
74212992fb08 Initial revision
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parents:
diff changeset
331 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332 SDL_SetError("Couldn't get audio format list");
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333 return(-1);
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parents:
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334 }
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335
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parents:
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336 /* Try for a closest match on audio format */
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337 format = 0;
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338 for ( test_format = SDL_FirstAudioFormat(spec->format);
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339 ! format && test_format; ) {
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340 #ifdef DEBUG_AUDIO
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341 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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342 #endif
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343 switch ( test_format ) {
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344 case AUDIO_U8:
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345 if ( value & AFMT_U8 ) {
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346 format = AFMT_U8;
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347 }
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348 break;
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349 case AUDIO_S8:
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350 if ( value & AFMT_S8 ) {
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351 format = AFMT_S8;
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352 }
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353 break;
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354 case AUDIO_S16LSB:
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355 if ( value & AFMT_S16_LE ) {
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356 format = AFMT_S16_LE;
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357 }
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358 break;
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diff changeset
359 case AUDIO_S16MSB:
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parents:
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360 if ( value & AFMT_S16_BE ) {
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361 format = AFMT_S16_BE;
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parents:
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362 }
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363 break;
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parents:
diff changeset
364 case AUDIO_U16LSB:
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365 if ( value & AFMT_U16_LE ) {
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366 format = AFMT_U16_LE;
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parents:
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367 }
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368 break;
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369 case AUDIO_U16MSB:
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370 if ( value & AFMT_U16_BE ) {
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371 format = AFMT_U16_BE;
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parents:
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372 }
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373 break;
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374 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
375 format = 0;
0
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parents:
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376 break;
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parents:
diff changeset
377 }
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Sam Lantinga <slouken@lokigames.com>
parents:
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378 if ( ! format ) {
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diff changeset
379 test_format = SDL_NextAudioFormat();
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parents:
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380 }
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parents:
diff changeset
381 }
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parents:
diff changeset
382 if ( format == 0 ) {
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383 SDL_SetError("Couldn't find any hardware audio formats");
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parents:
diff changeset
384 return(-1);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
385 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 spec->format = test_format;
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parents:
diff changeset
387
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parents:
diff changeset
388 /* Set the audio format */
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parents:
diff changeset
389 value = format;
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parents:
diff changeset
390 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391 (value != format) ) {
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parents:
diff changeset
392 SDL_SetError("Couldn't set audio format");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393 return(-1);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
394 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 /* Set mono or stereo audio (currently only two channels supported) */
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parents:
diff changeset
397 stereo = (spec->channels > 1);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398 ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 if ( stereo ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400 spec->channels = 2;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 spec->channels = 1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 /* Because some drivers don't allow setting the buffer size
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 after setting the format, we must re-open the audio device
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 once we know what format and channels are supported
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409 if ( DMA_ReopenAudio(this, audiodev, format, stereo, spec) < 0 ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 /* Error is set by DMA_ReopenAudio() */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 /* Memory map the audio buffer */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 if ( ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 SDL_SetError("Couldn't get OSPACE parameters");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 spec->size = info.fragsize;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 spec->samples = spec->size / ((spec->format & 0xFF) / 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 spec->samples /= spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 num_buffers = info.fragstotal;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 dma_len = num_buffers*spec->size;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 dma_buf = (Uint8 *)mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 audio_fd, 0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 if ( dma_buf == MAP_FAILED ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 SDL_SetError("DMA memory map failed");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 dma_buf = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
431 SDL_memset(dma_buf, spec->silence, dma_len);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 /* Check to see if we need to use select() workaround */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 { char *workaround;
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
435 workaround = SDL_getenv("SDL_DSP_NOSELECT");
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 if ( workaround ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 frame_ticks = (float)(spec->samples*1000)/spec->freq;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 next_frame = SDL_GetTicks()+frame_ticks;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 /* Trigger audio playback */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 value = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 value = PCM_ENABLE_OUTPUT;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446 if ( ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 SDL_SetError("Couldn't trigger audio output");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 /* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 parent = getpid();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 }