annotate src/audio/dma/SDL_dmaaudio.c @ 1228:f4a3a4129d04

From Mike Frysinger and/or Gentoo: - libsdl-SDL_stretch-PIC.patch ignoring the general fact of how SDL_stretch relies on executing dynamic code, the inline asm should let gcc handle the a details for getting the actual address for _copy_row as it will do the right thing test case: http://dev.gentoo.org/~vapier/libsdl/sdl-stretch.tar.bz2
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jan 2006 07:20:12 +0000
parents eec28a5278be
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Allow access to a raw mixing buffer */
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29
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30 #include <stdlib.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33 #include <errno.h>
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34 #include <unistd.h>
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35 #include <fcntl.h>
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36 #include <signal.h>
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37 #include <sys/types.h>
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38 #include <sys/time.h>
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39 #include <sys/ioctl.h>
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40 #include <sys/stat.h>
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41 #include <sys/mman.h>
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42 #ifdef OSS_USE_SOUNDCARD_H
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43 /* This is installed on some systems */
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44 #include <soundcard.h>
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45 #else
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46 /* This is recommended by OSS */
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47 #include <sys/soundcard.h>
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48 #endif
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49
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50 #ifndef MAP_FAILED
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51 #define MAP_FAILED ((Uint8 *)-1)
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52 #endif
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53
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54 #include "SDL_audio.h"
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55 #include "SDL_error.h"
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56 #include "SDL_audiomem.h"
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57 #include "SDL_audio_c.h"
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58 #include "SDL_timer.h"
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59 #include "SDL_audiodev_c.h"
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60 #include "SDL_dmaaudio.h"
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61
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62 /* The tag name used by DMA audio */
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63 #define DMA_DRIVER_NAME "dma"
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64
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65 /* Open the audio device for playback, and don't block if busy */
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66 #define OPEN_FLAGS (O_RDWR|O_NONBLOCK)
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67
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68 /* Audio driver functions */
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69 static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec);
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70 static void DMA_WaitAudio(_THIS);
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71 static void DMA_PlayAudio(_THIS);
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72 static Uint8 *DMA_GetAudioBuf(_THIS);
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73 static void DMA_CloseAudio(_THIS);
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74
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75 /* Audio driver bootstrap functions */
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76
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77 static int Audio_Available(void)
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78 {
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79 int available;
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80 int fd;
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81
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82 available = 0;
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83
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84 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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85 if ( fd >= 0 ) {
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86 int caps;
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87 struct audio_buf_info info;
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88
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89 if ( (ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) &&
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90 (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) &&
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91 (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0) ) {
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92 available = 1;
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93 }
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94 close(fd);
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95 }
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96 return(available);
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97 }
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98
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99 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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100 {
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101 free(device->hidden);
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102 free(device);
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103 }
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104
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105 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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106 {
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107 SDL_AudioDevice *this;
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108
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109 /* Initialize all variables that we clean on shutdown */
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110 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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111 if ( this ) {
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112 memset(this, 0, (sizeof *this));
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113 this->hidden = (struct SDL_PrivateAudioData *)
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114 malloc((sizeof *this->hidden));
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115 }
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116 if ( (this == NULL) || (this->hidden == NULL) ) {
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117 SDL_OutOfMemory();
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118 if ( this ) {
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119 free(this);
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120 }
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121 return(0);
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122 }
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123 memset(this->hidden, 0, (sizeof *this->hidden));
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124 audio_fd = -1;
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125
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126 /* Set the function pointers */
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127 this->OpenAudio = DMA_OpenAudio;
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128 this->WaitAudio = DMA_WaitAudio;
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129 this->PlayAudio = DMA_PlayAudio;
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130 this->GetAudioBuf = DMA_GetAudioBuf;
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131 this->CloseAudio = DMA_CloseAudio;
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132
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133 this->free = Audio_DeleteDevice;
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134
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135 return this;
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136 }
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137
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138 AudioBootStrap DMA_bootstrap = {
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139 DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio",
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140 Audio_Available, Audio_CreateDevice
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141 };
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142
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143 /* This function waits until it is possible to write a full sound buffer */
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144 static void DMA_WaitAudio(_THIS)
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145 {
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146 fd_set fdset;
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147
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148 /* Check to see if the thread-parent process is still alive */
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149 { static int cnt = 0;
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150 /* Note that this only works with thread implementations
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151 that use a different process id for each thread.
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152 */
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153 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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154 if ( kill(parent, 0) < 0 ) {
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155 this->enabled = 0;
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156 }
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157 }
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158 }
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159
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160 /* See if we need to use timed audio synchronization */
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161 if ( frame_ticks ) {
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162 /* Use timer for general audio synchronization */
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163 Sint32 ticks;
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164
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165 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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166 if ( ticks > 0 ) {
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167 SDL_Delay(ticks);
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168 }
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169 } else {
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170 /* Use select() for audio synchronization */
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171 struct timeval timeout;
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172 FD_ZERO(&fdset);
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173 FD_SET(audio_fd, &fdset);
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174 timeout.tv_sec = 10;
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175 timeout.tv_usec = 0;
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176 #ifdef DEBUG_AUDIO
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177 fprintf(stderr, "Waiting for audio to get ready\n");
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178 #endif
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179 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) {
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180 const char *message =
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181 #ifdef AUDIO_OSPACE_HACK
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182 "Audio timeout - buggy audio driver? (trying ospace)";
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183 #else
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184 "Audio timeout - buggy audio driver? (disabled)";
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185 #endif
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186 /* In general we should never print to the screen,
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187 but in this case we have no other way of letting
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188 the user know what happened.
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189 */
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190 fprintf(stderr, "SDL: %s\n", message);
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191 #ifdef AUDIO_OSPACE_HACK
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192 /* We may be able to use GET_OSPACE trick */
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193 frame_ticks = (float)(this->spec->samples*1000) /
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194 this->spec->freq;
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195 next_frame = SDL_GetTicks()+frame_ticks;
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196 #else
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197 this->enabled = 0;
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198 /* Don't try to close - may hang */
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199 audio_fd = -1;
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200 #ifdef DEBUG_AUDIO
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201 fprintf(stderr, "Done disabling audio\n");
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202 #endif
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203 #endif /* AUDIO_OSPACE_HACK */
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204 }
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205 #ifdef DEBUG_AUDIO
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206 fprintf(stderr, "Ready!\n");
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207 #endif
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208 }
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209 }
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210
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211 static void DMA_PlayAudio(_THIS)
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212 {
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213 /* If timer synchronization is enabled, set the next write frame */
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214 if ( frame_ticks ) {
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215 next_frame += frame_ticks;
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216 }
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217 return;
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218 }
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219
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220 static Uint8 *DMA_GetAudioBuf(_THIS)
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221 {
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222 count_info info;
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223 int playing;
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224 int filling;
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225
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226 /* Get number of blocks, looping if we're not using select() */
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227 do {
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228 if ( ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0 ) {
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229 /* Uh oh... */
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230 this->enabled = 0;
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231 return(NULL);
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232 }
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233 } while ( frame_ticks && (info.blocks < 1) );
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234 #ifdef DEBUG_AUDIO
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235 if ( info.blocks > 1 ) {
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236 printf("Warning: audio underflow (%d frags)\n", info.blocks-1);
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237 }
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diff changeset
238 #endif
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239 playing = info.ptr / this->spec.size;
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240 filling = (playing + 1)%num_buffers;
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241 return (dma_buf + (filling * this->spec.size));
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242 }
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243
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244 static void DMA_CloseAudio(_THIS)
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245 {
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diff changeset
246 if ( dma_buf != NULL ) {
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247 munmap(dma_buf, dma_len);
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248 dma_buf = NULL;
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249 }
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250 if ( audio_fd >= 0 ) {
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251 close(audio_fd);
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252 audio_fd = -1;
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253 }
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254 }
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255
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256 static int DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo,
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257 SDL_AudioSpec *spec)
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258 {
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259 int frag_spec;
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260 int value;
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diff changeset
261
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diff changeset
262 /* Close and then reopen the audio device */
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diff changeset
263 close(audio_fd);
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diff changeset
264 audio_fd = open(audiodev, O_RDWR, 0);
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diff changeset
265 if ( audio_fd < 0 ) {
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266 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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267 return(-1);
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parents:
diff changeset
268 }
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parents:
diff changeset
269
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diff changeset
270 /* Calculate the final parameters for this audio specification */
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diff changeset
271 SDL_CalculateAudioSpec(spec);
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diff changeset
272
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parents:
diff changeset
273 /* Determine the power of two of the fragment size */
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parents:
diff changeset
274 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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parents:
diff changeset
275 if ( (0x01<<frag_spec) != spec->size ) {
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parents:
diff changeset
276 SDL_SetError("Fragment size must be a power of two");
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parents:
diff changeset
277 return(-1);
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parents:
diff changeset
278 }
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parents:
diff changeset
279
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parents:
diff changeset
280 /* Set the audio buffering parameters */
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parents:
diff changeset
281 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
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parents:
diff changeset
282 SDL_SetError("Couldn't set audio fragment spec");
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parents:
diff changeset
283 return(-1);
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parents:
diff changeset
284 }
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parents:
diff changeset
285
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parents:
diff changeset
286 /* Set the audio format */
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parents:
diff changeset
287 value = format;
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parents:
diff changeset
288 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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parents:
diff changeset
289 (value != format) ) {
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parents:
diff changeset
290 SDL_SetError("Couldn't set audio format");
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parents:
diff changeset
291 return(-1);
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parents:
diff changeset
292 }
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parents:
diff changeset
293
74212992fb08 Initial revision
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parents:
diff changeset
294 /* Set mono or stereo audio */
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parents:
diff changeset
295 value = (spec->channels > 1);
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parents:
diff changeset
296 if ( (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) ||
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parents:
diff changeset
297 (value != stereo) ) {
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parents:
diff changeset
298 SDL_SetError("Couldn't set audio channels");
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diff changeset
299 return(-1);
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parents:
diff changeset
300 }
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parents:
diff changeset
301
74212992fb08 Initial revision
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parents:
diff changeset
302 /* Set the DSP frequency */
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parents:
diff changeset
303 value = spec->freq;
960
eec28a5278be Date: Sat, 9 Oct 2004 02:46:18 +0300 (EEST)
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
304 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
0
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parents:
diff changeset
305 SDL_SetError("Couldn't set audio frequency");
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parents:
diff changeset
306 return(-1);
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parents:
diff changeset
307 }
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parents:
diff changeset
308 spec->freq = value;
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parents:
diff changeset
309
74212992fb08 Initial revision
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parents:
diff changeset
310 /* We successfully re-opened the audio */
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parents:
diff changeset
311 return(0);
74212992fb08 Initial revision
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parents:
diff changeset
312 }
74212992fb08 Initial revision
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parents:
diff changeset
313
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parents:
diff changeset
314 static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec)
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parents:
diff changeset
315 {
74212992fb08 Initial revision
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parents:
diff changeset
316 char audiodev[1024];
74212992fb08 Initial revision
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parents:
diff changeset
317 int format;
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parents:
diff changeset
318 int stereo;
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parents:
diff changeset
319 int value;
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parents:
diff changeset
320 Uint16 test_format;
74212992fb08 Initial revision
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parents:
diff changeset
321 struct audio_buf_info info;
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parents:
diff changeset
322
74212992fb08 Initial revision
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parents:
diff changeset
323 /* Reset the timer synchronization flag */
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parents:
diff changeset
324 frame_ticks = 0.0;
74212992fb08 Initial revision
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parents:
diff changeset
325
74212992fb08 Initial revision
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parents:
diff changeset
326 /* Open the audio device */
74212992fb08 Initial revision
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parents:
diff changeset
327 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
74212992fb08 Initial revision
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parents:
diff changeset
328 if ( audio_fd < 0 ) {
74212992fb08 Initial revision
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parents:
diff changeset
329 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
74212992fb08 Initial revision
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parents:
diff changeset
330 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
331 }
74212992fb08 Initial revision
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parents:
diff changeset
332 dma_buf = NULL;
74212992fb08 Initial revision
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parents:
diff changeset
333 ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
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parents:
diff changeset
334
74212992fb08 Initial revision
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parents:
diff changeset
335 /* Get a list of supported hardware formats */
74212992fb08 Initial revision
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parents:
diff changeset
336 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
74212992fb08 Initial revision
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parents:
diff changeset
337 SDL_SetError("Couldn't get audio format list");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338 return(-1);
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parents:
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339 }
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parents:
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340
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parents:
diff changeset
341 /* Try for a closest match on audio format */
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parents:
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342 format = 0;
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parents:
diff changeset
343 for ( test_format = SDL_FirstAudioFormat(spec->format);
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parents:
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344 ! format && test_format; ) {
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parents:
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345 #ifdef DEBUG_AUDIO
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346 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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347 #endif
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348 switch ( test_format ) {
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parents:
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349 case AUDIO_U8:
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parents:
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350 if ( value & AFMT_U8 ) {
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parents:
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351 format = AFMT_U8;
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parents:
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352 }
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parents:
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353 break;
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parents:
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354 case AUDIO_S8:
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parents:
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355 if ( value & AFMT_S8 ) {
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356 format = AFMT_S8;
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parents:
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357 }
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358 break;
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359 case AUDIO_S16LSB:
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parents:
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360 if ( value & AFMT_S16_LE ) {
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parents:
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361 format = AFMT_S16_LE;
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parents:
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362 }
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parents:
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363 break;
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parents:
diff changeset
364 case AUDIO_S16MSB:
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parents:
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365 if ( value & AFMT_S16_BE ) {
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parents:
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366 format = AFMT_S16_BE;
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parents:
diff changeset
367 }
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parents:
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368 break;
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parents:
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369 case AUDIO_U16LSB:
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parents:
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370 if ( value & AFMT_U16_LE ) {
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parents:
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371 format = AFMT_U16_LE;
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parents:
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372 }
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parents:
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373 break;
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parents:
diff changeset
374 case AUDIO_U16MSB:
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parents:
diff changeset
375 if ( value & AFMT_U16_BE ) {
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376 format = AFMT_U16_BE;
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parents:
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377 }
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378 break;
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379 default:
354
30935e76acb5 Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
380 format = 0;
0
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parents:
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381 break;
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parents:
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382 }
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Sam Lantinga <slouken@lokigames.com>
parents:
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383 if ( ! format ) {
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parents:
diff changeset
384 test_format = SDL_NextAudioFormat();
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parents:
diff changeset
385 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
386 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
387 if ( format == 0 ) {
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parents:
diff changeset
388 SDL_SetError("Couldn't find any hardware audio formats");
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parents:
diff changeset
389 return(-1);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
390 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
391 spec->format = test_format;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
392
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
393 /* Set the audio format */
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parents:
diff changeset
394 value = format;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
395 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
396 (value != format) ) {
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parents:
diff changeset
397 SDL_SetError("Couldn't set audio format");
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
398 return(-1);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
399 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
400
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
401 /* Set mono or stereo audio (currently only two channels supported) */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
402 stereo = (spec->channels > 1);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
403 ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
404 if ( stereo ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
405 spec->channels = 2;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
406 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
407 spec->channels = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
408 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
410 /* Because some drivers don't allow setting the buffer size
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
411 after setting the format, we must re-open the audio device
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 once we know what format and channels are supported
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 if ( DMA_ReopenAudio(this, audiodev, format, stereo, spec) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 /* Error is set by DMA_ReopenAudio() */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
416 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
419 /* Memory map the audio buffer */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
420 if ( ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
421 SDL_SetError("Couldn't get OSPACE parameters");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
422 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
423 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
424 spec->size = info.fragsize;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
425 spec->samples = spec->size / ((spec->format & 0xFF) / 8);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 spec->samples /= spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 num_buffers = info.fragstotal;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 dma_len = num_buffers*spec->size;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
429 dma_buf = (Uint8 *)mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
430 audio_fd, 0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
431 if ( dma_buf == MAP_FAILED ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 SDL_SetError("DMA memory map failed");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
433 dma_buf = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 memset(dma_buf, spec->silence, dma_len);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438 /* Check to see if we need to use select() workaround */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 { char *workaround;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 workaround = getenv("SDL_DSP_NOSELECT");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 if ( workaround ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 frame_ticks = (float)(spec->samples*1000)/spec->freq;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 next_frame = SDL_GetTicks()+frame_ticks;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
446
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
447 /* Trigger audio playback */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
448 value = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
449 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 value = PCM_ENABLE_OUTPUT;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 if ( ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 SDL_SetError("Couldn't trigger audio output");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
453 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
454 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 /* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
457 parent = getpid();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 }