annotate src/audio/dsp/SDL_dspaudio.c @ 297:f6ffac90895c

Updated copyright information for 2002
author Sam Lantinga <slouken@libsdl.org>
date Wed, 06 Mar 2002 11:23:08 +0000
parents e8157fcb3114
children 30935e76acb5
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, 1998, 1999, 2000, 2001, 2002 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/time.h>
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38 #include <sys/ioctl.h>
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39 #include <sys/stat.h>
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40 #ifdef OSS_USE_SOUNDCARD_H
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41 /* This is installed on some systems */
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42 #include <soundcard.h>
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43 #else
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44 /* This is recommended by OSS */
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45 #include <sys/soundcard.h>
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46 #endif
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47
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48 #include "SDL_audio.h"
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49 #include "SDL_error.h"
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50 #include "SDL_audiomem.h"
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51 #include "SDL_audio_c.h"
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52 #include "SDL_timer.h"
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53 #include "SDL_audiodev_c.h"
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54 #include "SDL_dspaudio.h"
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55
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56 /* The tag name used by DSP audio */
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57 #define DSP_DRIVER_NAME "dsp"
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58
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59 /* Open the audio device for playback, and don't block if busy */
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60 /*#define USE_BLOCKING_WRITES*/
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61 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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62
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63 /* Audio driver functions */
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64 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec);
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65 static void DSP_WaitAudio(_THIS);
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66 static void DSP_PlayAudio(_THIS);
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67 static Uint8 *DSP_GetAudioBuf(_THIS);
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68 static void DSP_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 fd;
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75 int available;
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76
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77 available = 0;
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78 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
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79 if ( fd >= 0 ) {
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80 available = 1;
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81 close(fd);
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82 }
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83 return(available);
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84 }
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85
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86 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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87 {
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88 free(device->hidden);
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89 free(device);
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90 }
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91
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92 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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93 {
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94 SDL_AudioDevice *this;
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95
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96 /* Initialize all variables that we clean on shutdown */
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97 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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98 if ( this ) {
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99 memset(this, 0, (sizeof *this));
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100 this->hidden = (struct SDL_PrivateAudioData *)
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101 malloc((sizeof *this->hidden));
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102 }
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103 if ( (this == NULL) || (this->hidden == NULL) ) {
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104 SDL_OutOfMemory();
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105 if ( this ) {
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106 free(this);
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107 }
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108 return(0);
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109 }
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110 memset(this->hidden, 0, (sizeof *this->hidden));
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111 audio_fd = -1;
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112
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113 /* Set the function pointers */
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114 this->OpenAudio = DSP_OpenAudio;
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115 this->WaitAudio = DSP_WaitAudio;
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116 this->PlayAudio = DSP_PlayAudio;
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117 this->GetAudioBuf = DSP_GetAudioBuf;
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118 this->CloseAudio = DSP_CloseAudio;
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119
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120 this->free = Audio_DeleteDevice;
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121
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122 return this;
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123 }
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124
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125 AudioBootStrap DSP_bootstrap = {
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126 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
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127 Audio_Available, Audio_CreateDevice
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128 };
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129
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130 /* This function waits until it is possible to write a full sound buffer */
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131 static void DSP_WaitAudio(_THIS)
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132 {
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133 /* Check to see if the thread-parent process is still alive */
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134 { static int cnt = 0;
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135 /* Note that this only works with thread implementations
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136 that use a different process id for each thread.
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137 */
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138 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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139 if ( kill(parent, 0) < 0 ) {
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140 this->enabled = 0;
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141 }
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142 }
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143 }
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144
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145 #ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */
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146 /* See if we need to use timed audio synchronization */
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147 if ( frame_ticks ) {
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148 /* Use timer for general audio synchronization */
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149 Sint32 ticks;
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150
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151 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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152 if ( ticks > 0 ) {
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153 SDL_Delay(ticks);
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154 }
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155 } else {
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156 /* Use select() for audio synchronization */
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157 fd_set fdset;
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158 struct timeval timeout;
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159
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160 FD_ZERO(&fdset);
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161 FD_SET(audio_fd, &fdset);
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162 timeout.tv_sec = 10;
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163 timeout.tv_usec = 0;
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164 #ifdef DEBUG_AUDIO
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165 fprintf(stderr, "Waiting for audio to get ready\n");
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166 #endif
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167 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) {
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168 const char *message =
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169 "Audio timeout - buggy audio driver? (disabled)";
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170 /* In general we should never print to the screen,
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171 but in this case we have no other way of letting
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172 the user know what happened.
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173 */
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174 fprintf(stderr, "SDL: %s\n", message);
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175 this->enabled = 0;
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176 /* Don't try to close - may hang */
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177 audio_fd = -1;
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178 #ifdef DEBUG_AUDIO
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179 fprintf(stderr, "Done disabling audio\n");
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180 #endif
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181 }
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182 #ifdef DEBUG_AUDIO
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183 fprintf(stderr, "Ready!\n");
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184 #endif
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185 }
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186 #endif /* !USE_BLOCKING_WRITES */
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187 }
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188
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189 static void DSP_PlayAudio(_THIS)
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190 {
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191 int written, p=0;
0
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192
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193 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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194 do {
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195 written = write(audio_fd, &mixbuf[p], mixlen-p);
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196 if (written>0)
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197 p += written;
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198 if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR)
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199 {
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200 /* Non recoverable error has occurred. It should be reported!!! */
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201 perror("audio");
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202 break;
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203 }
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204
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205 if ( p < written || ((written < 0) && ((errno == 0) || (errno == EAGAIN))) ) {
0
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206 SDL_Delay(1); /* Let a little CPU time go by */
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207 }
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208 } while ( p < written );
0
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209
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210 /* If timer synchronization is enabled, set the next write frame */
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211 if ( frame_ticks ) {
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212 next_frame += frame_ticks;
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213 }
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214
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215 /* If we couldn't write, assume fatal error for now */
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216 if ( written < 0 ) {
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217 this->enabled = 0;
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218 }
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219 #ifdef DEBUG_AUDIO
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220 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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221 #endif
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222 }
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223
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224 static Uint8 *DSP_GetAudioBuf(_THIS)
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225 {
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226 return(mixbuf);
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227 }
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228
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229 static void DSP_CloseAudio(_THIS)
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230 {
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231 if ( mixbuf != NULL ) {
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232 SDL_FreeAudioMem(mixbuf);
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233 mixbuf = NULL;
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234 }
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235 if ( audio_fd >= 0 ) {
248
8e47ebb7bced Reset the device before closing it - fixes a hang with some audio drivers
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236 int value;
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237 ioctl(audio_fd, SNDCTL_DSP_RESET, &value);
0
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238 close(audio_fd);
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239 audio_fd = -1;
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240 }
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241 }
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242
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243 static int DSP_ReopenAudio(_THIS, const char *audiodev, int format,
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244 SDL_AudioSpec *spec)
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245 {
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246 int frag_spec;
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247 int value;
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248
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249 /* Close and then reopen the audio device */
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250 close(audio_fd);
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251 audio_fd = open(audiodev, O_WRONLY, 0);
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252 if ( audio_fd < 0 ) {
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253 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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254 return(-1);
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255 }
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256
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257 /* Calculate the final parameters for this audio specification */
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258 SDL_CalculateAudioSpec(spec);
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259
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260 /* Determine the power of two of the fragment size */
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261 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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262 if ( (0x01<<frag_spec) != spec->size ) {
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263 SDL_SetError("Fragment size must be a power of two");
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264 return(-1);
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265 }
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266 frag_spec |= 0x00020000; /* two fragments, for low latency */
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267
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268 /* Set the audio buffering parameters */
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269 #ifdef DEBUG_AUDIO
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270 fprintf(stderr, "Requesting %d fragments of size %d\n",
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271 (frag_spec >> 16), 1<<(frag_spec&0xFFFF));
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272 #endif
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273 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
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274 fprintf(stderr, "Warning: Couldn't set audio fragment size\n");
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275 }
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276 #ifdef DEBUG_AUDIO
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277 { audio_buf_info info;
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278 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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279 fprintf(stderr, "fragments = %d\n", info.fragments);
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280 fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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281 fprintf(stderr, "fragsize = %d\n", info.fragsize);
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282 fprintf(stderr, "bytes = %d\n", info.bytes);
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283 }
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284 #endif
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285
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286 /* Set the audio format */
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287 value = format;
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288 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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diff changeset
289 (value != format) ) {
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diff changeset
290 SDL_SetError("Couldn't set audio format");
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diff changeset
291 return(-1);
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diff changeset
292 }
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293
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diff changeset
294 /* Set the number of channels of output */
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diff changeset
295 value = spec->channels;
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diff changeset
296 #ifdef SNDCTL_DSP_CHANNELS
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diff changeset
297 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) {
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diff changeset
298 #endif
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diff changeset
299 value = (spec->channels > 1);
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diff changeset
300 ioctl(audio_fd, SNDCTL_DSP_STEREO, &value);
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diff changeset
301 value = (value ? 2 : 1);
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diff changeset
302 #ifdef SNDCTL_DSP_CHANNELS
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diff changeset
303 }
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diff changeset
304 #endif
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diff changeset
305 if ( value != spec->channels ) {
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diff changeset
306 SDL_SetError("Couldn't set audio channels");
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diff changeset
307 return(-1);
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parents:
diff changeset
308 }
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diff changeset
309
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parents:
diff changeset
310 /* Set the DSP frequency */
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parents:
diff changeset
311 value = spec->freq;
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diff changeset
312 if ( ioctl(audio_fd, SOUND_PCM_WRITE_RATE, &value) < 0 ) {
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diff changeset
313 SDL_SetError("Couldn't set audio frequency");
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diff changeset
314 return(-1);
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diff changeset
315 }
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diff changeset
316 spec->freq = value;
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diff changeset
317
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parents:
diff changeset
318 /* We successfully re-opened the audio */
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parents:
diff changeset
319 return(0);
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parents:
diff changeset
320 }
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diff changeset
321
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322 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
323 {
74212992fb08 Initial revision
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parents:
diff changeset
324 char audiodev[1024];
74212992fb08 Initial revision
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parents:
diff changeset
325 int format;
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diff changeset
326 int value;
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diff changeset
327 Uint16 test_format;
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diff changeset
328
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diff changeset
329 /* Reset the timer synchronization flag */
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diff changeset
330 frame_ticks = 0.0;
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diff changeset
331
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diff changeset
332 /* Open the audio device */
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diff changeset
333 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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334 if ( audio_fd < 0 ) {
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335 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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336 return(-1);
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337 }
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338 mixbuf = NULL;
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339
96
799bea5504e2 Fixed blocking open bug when using blocking audio writes
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340 #ifdef USE_BLOCKING_WRITES
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341 /* Make the file descriptor use blocking writes with fcntl() */
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342 { long flags;
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343 flags = fcntl(audio_fd, F_GETFL);
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344 flags &= ~O_NONBLOCK;
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345 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) {
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346 SDL_SetError("Couldn't set audio blocking mode");
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347 return(-1);
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348 }
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349 }
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350 #endif
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351
0
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352 /* Get a list of supported hardware formats */
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353 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
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354 SDL_SetError("Couldn't get audio format list");
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355 return(-1);
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356 }
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357
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358 /* Try for a closest match on audio format */
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359 format = 0;
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360 for ( test_format = SDL_FirstAudioFormat(spec->format);
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361 ! format && test_format; ) {
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362 #ifdef DEBUG_AUDIO
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363 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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364 #endif
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365 switch ( test_format ) {
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366 case AUDIO_U8:
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367 if ( value & AFMT_U8 ) {
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368 format = AFMT_U8;
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369 }
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370 break;
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371 case AUDIO_S8:
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372 if ( value & AFMT_S8 ) {
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373 format = AFMT_S8;
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374 }
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375 break;
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376 case AUDIO_S16LSB:
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377 if ( value & AFMT_S16_LE ) {
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378 format = AFMT_S16_LE;
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379 }
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380 break;
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381 case AUDIO_S16MSB:
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382 if ( value & AFMT_S16_BE ) {
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383 format = AFMT_S16_BE;
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384 }
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385 break;
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386 case AUDIO_U16LSB:
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387 if ( value & AFMT_U16_LE ) {
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388 format = AFMT_U16_LE;
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389 }
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390 break;
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391 case AUDIO_U16MSB:
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392 if ( value & AFMT_U16_BE ) {
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393 format = AFMT_U16_BE;
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394 }
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395 break;
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396 default:
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397 break;
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398 }
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399 if ( ! format ) {
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400 test_format = SDL_NextAudioFormat();
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401 }
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diff changeset
402 }
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parents:
diff changeset
403 if ( format == 0 ) {
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diff changeset
404 SDL_SetError("Couldn't find any hardware audio formats");
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diff changeset
405 return(-1);
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parents:
diff changeset
406 }
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407 spec->format = test_format;
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diff changeset
408
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diff changeset
409 /* Set the audio format */
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diff changeset
410 value = format;
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411 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
74212992fb08 Initial revision
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parents:
diff changeset
412 (value != format) ) {
74212992fb08 Initial revision
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diff changeset
413 SDL_SetError("Couldn't set audio format");
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parents:
diff changeset
414 return(-1);
74212992fb08 Initial revision
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parents:
diff changeset
415 }
74212992fb08 Initial revision
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diff changeset
416
74212992fb08 Initial revision
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diff changeset
417 /* Set the number of channels of output */
74212992fb08 Initial revision
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diff changeset
418 value = spec->channels;
74212992fb08 Initial revision
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diff changeset
419 #ifdef SNDCTL_DSP_CHANNELS
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420 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) {
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diff changeset
421 #endif
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diff changeset
422 value = (spec->channels > 1);
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diff changeset
423 ioctl(audio_fd, SNDCTL_DSP_STEREO, &value);
74212992fb08 Initial revision
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diff changeset
424 value = (value ? 2 : 1);
74212992fb08 Initial revision
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diff changeset
425 #ifdef SNDCTL_DSP_CHANNELS
74212992fb08 Initial revision
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diff changeset
426 }
74212992fb08 Initial revision
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parents:
diff changeset
427 #endif
74212992fb08 Initial revision
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diff changeset
428 spec->channels = value;
74212992fb08 Initial revision
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diff changeset
429
74212992fb08 Initial revision
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parents:
diff changeset
430 /* Because some drivers don't allow setting the buffer size
74212992fb08 Initial revision
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parents:
diff changeset
431 after setting the format, we must re-open the audio device
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
432 once we know what format and channels are supported
74212992fb08 Initial revision
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parents:
diff changeset
433 */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 if ( DSP_ReopenAudio(this, audiodev, format, spec) < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 /* Error is set by DSP_ReopenAudio() */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
437 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
438
74212992fb08 Initial revision
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parents:
diff changeset
439 /* Allocate mixing buffer */
74212992fb08 Initial revision
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parents:
diff changeset
440 mixlen = spec->size;
74212992fb08 Initial revision
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parents:
diff changeset
441 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
74212992fb08 Initial revision
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parents:
diff changeset
442 if ( mixbuf == NULL ) {
74212992fb08 Initial revision
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parents:
diff changeset
443 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445 memset(mixbuf, spec->silence, spec->size);
74212992fb08 Initial revision
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parents:
diff changeset
446
74212992fb08 Initial revision
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parents:
diff changeset
447 #ifndef USE_BLOCKING_WRITES
74212992fb08 Initial revision
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parents:
diff changeset
448 /* Check to see if we need to use select() workaround */
74212992fb08 Initial revision
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parents:
diff changeset
449 { char *workaround;
74212992fb08 Initial revision
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parents:
diff changeset
450 workaround = getenv("SDL_DSP_NOSELECT");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451 if ( workaround ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
452 frame_ticks = (float)(spec->samples*1000)/spec->freq;
74212992fb08 Initial revision
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parents:
diff changeset
453 next_frame = SDL_GetTicks()+frame_ticks;
74212992fb08 Initial revision
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parents:
diff changeset
454 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 }
74212992fb08 Initial revision
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parents:
diff changeset
456 #endif /* !USE_BLOCKING_WRITES */
74212992fb08 Initial revision
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parents:
diff changeset
457
74212992fb08 Initial revision
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parents:
diff changeset
458 /* Get the parent process id (we're the parent of the audio thread) */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 parent = getpid();
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
460
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
461 /* We're ready to rock and roll. :-) */
74212992fb08 Initial revision
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parents:
diff changeset
462 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 }