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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 #include "SDL_config.h" |
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23 |
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24 /* |
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25 * Driver for native OpenBSD/NetBSD audio(4). |
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26 * vedge@vedge.com.ar. |
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27 */ |
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28 |
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29 #include <errno.h> |
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30 #include <unistd.h> |
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31 #include <fcntl.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/types.h> |
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36 #include <sys/audioio.h> |
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37 |
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38 #include "SDL_timer.h" |
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39 #include "SDL_audio.h" |
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40 #include "../SDL_audiomem.h" |
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41 #include "../SDL_audio_c.h" |
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42 #include "../SDL_audiodev_c.h" |
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43 #include "SDL_bsdaudio.h" |
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44 |
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45 /* The tag name used by NetBSD/OpenBSD audio */ |
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46 #ifdef __NetBSD__ |
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47 #define BSD_AUDIO_DRIVER_NAME "netbsd" |
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48 #define BSD_AUDIO_DRIVER_DESC "Native NetBSD audio" |
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49 #else |
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50 #define BSD_AUDIO_DRIVER_NAME "openbsd" |
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51 #define BSD_AUDIO_DRIVER_DESC "Native OpenBSD audio" |
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52 #endif |
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53 |
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54 /* Open the audio device for playback, and don't block if busy */ |
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55 /* #define USE_BLOCKING_WRITES */ |
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56 |
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57 /* Use timer for synchronization */ |
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58 /* #define USE_TIMER_SYNC */ |
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59 |
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60 /* #define DEBUG_AUDIO */ |
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61 /* #define DEBUG_AUDIO_STREAM */ |
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62 |
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63 #ifdef USE_BLOCKING_WRITES |
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64 #define OPEN_FLAGS O_WRONLY |
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65 #else |
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66 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) |
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67 #endif |
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68 |
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69 /* Audio driver functions */ |
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70 static void OBSD_WaitAudio(_THIS); |
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71 static int OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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72 static void OBSD_PlayAudio(_THIS); |
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73 static Uint8 *OBSD_GetAudioBuf(_THIS); |
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74 static void OBSD_CloseAudio(_THIS); |
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75 |
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76 #ifdef DEBUG_AUDIO |
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77 static void OBSD_Status(_THIS); |
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78 #endif |
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79 |
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80 /* Audio driver bootstrap functions */ |
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81 |
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82 static int |
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83 Audio_Available(void) |
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84 { |
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85 int fd; |
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86 int available; |
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87 |
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88 available = 0; |
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89 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); |
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90 if(fd >= 0) { |
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91 available = 1; |
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92 close(fd); |
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93 } |
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94 return(available); |
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95 } |
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96 |
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97 static void |
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98 Audio_DeleteDevice(SDL_AudioDevice *device) |
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99 { |
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100 SDL_free(device->hidden); |
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101 SDL_free(device); |
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102 } |
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103 |
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104 static SDL_AudioDevice |
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105 *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*)SDL_malloc(sizeof(SDL_AudioDevice)); |
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111 if(this) { |
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112 SDL_memset(this, 0, (sizeof *this)); |
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113 this->hidden = |
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114 (struct SDL_PrivateAudioData*)SDL_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) SDL_free(this); |
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119 return(0); |
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120 } |
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121 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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122 audio_fd = -1; |
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123 |
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124 /* Set the function pointers */ |
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125 this->OpenAudio = OBSD_OpenAudio; |
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126 this->WaitAudio = OBSD_WaitAudio; |
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127 this->PlayAudio = OBSD_PlayAudio; |
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128 this->GetAudioBuf = OBSD_GetAudioBuf; |
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129 this->CloseAudio = OBSD_CloseAudio; |
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130 |
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131 this->free = Audio_DeleteDevice; |
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132 |
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133 return this; |
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134 } |
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135 |
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136 AudioBootStrap BSD_AUDIO_bootstrap = { |
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137 BSD_AUDIO_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC, |
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138 Audio_Available, Audio_CreateDevice |
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139 }; |
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140 |
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141 /* This function waits until it is possible to write a full sound buffer */ |
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142 static void |
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143 OBSD_WaitAudio(_THIS) |
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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 |
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190 OBSD_PlayAudio(_THIS) |
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191 { |
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192 int written, p=0; |
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193 |
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194 /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
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195 do { |
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196 written = write(audio_fd, &mixbuf[p], mixlen-p); |
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197 if (written>0) |
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198 p += written; |
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199 if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR) |
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200 { |
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201 /* Non recoverable error has occurred. It should be reported!!! */ |
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202 perror("audio"); |
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203 break; |
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204 } |
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205 |
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206 if ( p < written || ((written < 0) && ((errno == 0) || (errno == EAGAIN))) ) { |
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207 SDL_Delay(1); /* Let a little CPU time go by */ |
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208 } |
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209 } while ( p < written ); |
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210 |
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211 /* If timer synchronization is enabled, set the next write frame */ |
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212 if ( frame_ticks ) { |
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213 next_frame += frame_ticks; |
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214 } |
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215 |
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216 /* If we couldn't write, assume fatal error for now */ |
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217 if ( written < 0 ) { |
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218 this->enabled = 0; |
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219 } |
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220 #ifdef DEBUG_AUDIO |
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221 fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
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222 #endif |
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223 } |
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224 |
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225 static Uint8 |
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226 *OBSD_GetAudioBuf(_THIS) |
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227 { |
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228 return(mixbuf); |
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229 } |
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230 |
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231 static void |
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232 OBSD_CloseAudio(_THIS) |
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233 { |
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234 if(mixbuf != NULL) { |
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235 SDL_FreeAudioMem(mixbuf); |
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236 mixbuf = NULL; |
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237 } |
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238 if(audio_fd >= 0) { |
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239 close(audio_fd); |
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240 audio_fd = -1; |
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241 } |
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242 } |
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243 |
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244 #ifdef DEBUG_AUDIO |
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245 void |
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246 OBSD_Status(_THIS) |
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247 { |
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248 audio_info_t info; |
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249 |
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250 if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
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251 fprintf(stderr,"AUDIO_GETINFO failed.\n"); |
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252 return; |
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253 } |
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254 |
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255 fprintf(stderr,"\n" |
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256 "[play/record info]\n" |
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257 "buffer size : %d bytes\n" |
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258 "sample rate : %i Hz\n" |
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259 "channels : %i\n" |
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260 "precision : %i-bit\n" |
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261 "encoding : 0x%x\n" |
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262 "seek : %i\n" |
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263 "sample count : %i\n" |
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264 "EOF count : %i\n" |
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265 "paused : %s\n" |
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266 "error occured : %s\n" |
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267 "waiting : %s\n" |
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268 "active : %s\n" |
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269 "", |
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270 info.play.buffer_size, |
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271 info.play.sample_rate, |
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272 info.play.channels, |
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273 info.play.precision, |
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274 info.play.encoding, |
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275 info.play.seek, |
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276 info.play.samples, |
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277 info.play.eof, |
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278 info.play.pause ? "yes" : "no", |
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279 info.play.error ? "yes" : "no", |
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280 info.play.waiting ? "yes" : "no", |
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281 info.play.active ? "yes": "no"); |
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282 |
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283 fprintf(stderr,"\n" |
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284 "[audio info]\n" |
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285 "monitor_gain : %i\n" |
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286 "hw block size : %d bytes\n" |
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287 "hi watermark : %i\n" |
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288 "lo watermark : %i\n" |
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289 "audio mode : %s\n" |
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290 "", |
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291 info.monitor_gain, |
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292 info.blocksize, |
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293 info.hiwat, info.lowat, |
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294 (info.mode == AUMODE_PLAY) ? "PLAY" |
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295 : (info.mode = AUMODE_RECORD) ? "RECORD" |
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296 : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" |
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297 : "?")); |
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298 } |
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299 #endif /* DEBUG_AUDIO */ |
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300 |
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301 static int |
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302 OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec) |
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303 { |
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304 char audiodev[64]; |
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305 Uint16 format; |
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306 audio_info_t info; |
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307 |
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308 AUDIO_INITINFO(&info); |
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309 |
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310 /* Calculate the final parameters for this audio specification */ |
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311 SDL_CalculateAudioSpec(spec); |
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312 |
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313 #ifdef USE_TIMER_SYNC |
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314 frame_ticks = 0.0; |
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315 #endif |
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316 |
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317 /* Open the audio device */ |
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318 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
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319 if(audio_fd < 0) { |
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320 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
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321 return(-1); |
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322 } |
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323 |
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324 /* Set to play mode */ |
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325 info.mode = AUMODE_PLAY; |
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326 if(ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) { |
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327 SDL_SetError("Couldn't put device into play mode"); |
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328 return(-1); |
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329 } |
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330 |
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331 mixbuf = NULL; |
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332 AUDIO_INITINFO(&info); |
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333 for (format = SDL_FirstAudioFormat(spec->format); |
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334 format; format = SDL_NextAudioFormat()) |
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335 { |
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336 switch(format) { |
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337 case AUDIO_U8: |
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338 info.play.encoding = AUDIO_ENCODING_ULINEAR; |
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339 info.play.precision = 8; |
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340 break; |
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341 case AUDIO_S8: |
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342 info.play.encoding = AUDIO_ENCODING_SLINEAR; |
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343 info.play.precision = 8; |
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344 break; |
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345 case AUDIO_S16LSB: |
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346 info.play.encoding = AUDIO_ENCODING_SLINEAR_LE; |
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347 info.play.precision = 16; |
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348 break; |
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349 case AUDIO_S16MSB: |
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350 info.play.encoding = AUDIO_ENCODING_SLINEAR_BE; |
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351 info.play.precision = 16; |
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352 break; |
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353 case AUDIO_U16LSB: |
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354 info.play.encoding = AUDIO_ENCODING_ULINEAR_LE; |
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355 info.play.precision = 16; |
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356 break; |
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357 case AUDIO_U16MSB: |
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358 info.play.encoding = AUDIO_ENCODING_ULINEAR_BE; |
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359 info.play.precision = 16; |
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360 break; |
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361 default: |
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362 continue; |
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363 } |
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364 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0) |
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365 break; |
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366 } |
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367 |
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368 if(!format) { |
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369 SDL_SetError("No supported encoding for 0x%x", spec->format); |
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370 return(-1); |
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371 } |
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372 |
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373 spec->format = format; |
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374 |
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375 AUDIO_INITINFO(&info); |
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376 info.play.channels = spec->channels; |
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377 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1) |
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378 spec->channels = 1; |
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379 AUDIO_INITINFO(&info); |
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380 info.play.sample_rate = spec->freq; |
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381 info.blocksize = spec->size; |
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382 info.hiwat = 5; |
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383 info.lowat = 3; |
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384 (void)ioctl(audio_fd, AUDIO_SETINFO, &info); |
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385 (void)ioctl(audio_fd, AUDIO_GETINFO, &info); |
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386 spec->freq = info.play.sample_rate; |
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387 /* Allocate mixing buffer */ |
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388 mixlen = spec->size; |
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389 mixbuf = (Uint8*)SDL_AllocAudioMem(mixlen); |
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390 if(mixbuf == NULL) { |
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391 return(-1); |
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392 } |
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393 SDL_memset(mixbuf, spec->silence, spec->size); |
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394 |
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395 /* Get the parent process id (we're the parent of the audio thread) */ |
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396 parent = getpid(); |
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397 |
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398 #ifdef DEBUG_AUDIO |
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399 OBSD_Status(this); |
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400 #endif |
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401 |
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402 /* We're ready to rock and roll. :-) */ |
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403 return(0); |
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404 } |