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annotate src/audio/bsd/SDL_bsdaudio.c @ 1668:4da1ee79c9af SDL-1.3

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more tweaking indent options
author Sam Lantinga <slouken@libsdl.org>
date Mon, 29 May 2006 04:04:35 +0000
parents 782fd950bd46
children
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 #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 = (struct SDL_PrivateAudioData *)
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114 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)
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119 SDL_free(this);
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120 return (0);
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121 }
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122 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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123 audio_fd = -1;
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124
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125 /* Set the function pointers */
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126 this->OpenAudio = OBSD_OpenAudio;
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127 this->WaitAudio = OBSD_WaitAudio;
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128 this->PlayAudio = OBSD_PlayAudio;
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129 this->GetAudioBuf = OBSD_GetAudioBuf;
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130 this->CloseAudio = OBSD_CloseAudio;
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131
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132 this->free = Audio_DeleteDevice;
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133
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134 return this;
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135 }
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136
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137 AudioBootStrap BSD_AUDIO_bootstrap = {
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138 BSD_AUDIO_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC,
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139 Audio_Available, Audio_CreateDevice
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140 };
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141
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142 /* This function waits until it is possible to write a full sound buffer */
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143 static void
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144 OBSD_WaitAudio(_THIS)
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145 {
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146 #ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */
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147 /* See if we need to use timed audio synchronization */
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148 if (frame_ticks) {
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149 /* Use timer for general audio synchronization */
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150 Sint32 ticks;
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151
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152 ticks = ((Sint32) (next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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153 if (ticks > 0) {
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154 SDL_Delay(ticks);
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155 }
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156 } else {
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157 /* Use select() for audio synchronization */
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158 fd_set fdset;
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159 struct timeval timeout;
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160
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161 FD_ZERO(&fdset);
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162 FD_SET(audio_fd, &fdset);
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163 timeout.tv_sec = 10;
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164 timeout.tv_usec = 0;
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165 #ifdef DEBUG_AUDIO
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166 fprintf(stderr, "Waiting for audio to get ready\n");
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167 #endif
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168 if (select(audio_fd + 1, NULL, &fdset, NULL, &timeout) <= 0) {
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169 const char *message =
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170 "Audio timeout - buggy audio driver? (disabled)";
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171 /* In general we should never print to the screen,
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172 but in this case we have no other way of letting
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173 the user know what happened.
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174 */
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175 fprintf(stderr, "SDL: %s\n", message);
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176 this->enabled = 0;
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177 /* Don't try to close - may hang */
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178 audio_fd = -1;
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179 #ifdef DEBUG_AUDIO
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180 fprintf(stderr, "Done disabling audio\n");
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181 #endif
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182 }
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183 #ifdef DEBUG_AUDIO
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184 fprintf(stderr, "Ready!\n");
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185 #endif
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186 }
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187 #endif /* !USE_BLOCKING_WRITES */
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188 }
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189
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190 static void
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191 OBSD_PlayAudio(_THIS)
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192 {
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193 int written, p = 0;
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194
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195 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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196 do {
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197 written = write(audio_fd, &mixbuf[p], mixlen - p);
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198 if (written > 0)
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199 p += written;
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200 if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR) {
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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
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207 || ((written < 0) && ((errno == 0) || (errno == EAGAIN)))) {
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208 SDL_Delay(1); /* Let a little CPU time go by */
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209 }
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210 }
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211 while (p < written);
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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
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218 /* If we couldn't write, assume fatal error for now */
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219 if (written < 0) {
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220 this->enabled = 0;
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221 }
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222 #ifdef DEBUG_AUDIO
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223 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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224 #endif
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225 }
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226
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227 static Uint8 *
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228 OBSD_GetAudioBuf(_THIS)
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229 {
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230 return (mixbuf);
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231 }
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232
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233 static void
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234 OBSD_CloseAudio(_THIS)
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235 {
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236 if (mixbuf != NULL) {
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237 SDL_FreeAudioMem(mixbuf);
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238 mixbuf = NULL;
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239 }
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240 if (audio_fd >= 0) {
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241 close(audio_fd);
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242 audio_fd = -1;
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243 }
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244 }
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245
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246 #ifdef DEBUG_AUDIO
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247 void
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248 OBSD_Status(_THIS)
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249 {
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250 audio_info_t info;
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251
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252 if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
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253 fprintf(stderr, "AUDIO_GETINFO failed.\n");
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254 return;
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255 }
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256
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257 fprintf(stderr, "\n"
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258 "[play/record info]\n"
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259 "buffer size : %d bytes\n"
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260 "sample rate : %i Hz\n"
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261 "channels : %i\n"
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262 "precision : %i-bit\n"
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263 "encoding : 0x%x\n"
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264 "seek : %i\n"
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265 "sample count : %i\n"
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266 "EOF count : %i\n"
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267 "paused : %s\n"
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268 "error occured : %s\n"
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269 "waiting : %s\n"
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270 "active : %s\n"
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271 "",
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272 info.
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273 play.
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274 buffer_size,
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275 info.
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276 play.
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277 sample_rate,
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278 info.
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279 play.
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280 channels,
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281 info.
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282 play.
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283 precision,
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284 info.
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285 play.
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286 encoding,
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287 info.
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288 play.
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diff changeset
289 seek,
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290 info.
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291 play.
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diff changeset
292 samples,
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293 info.
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294 play.
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diff changeset
295 eof,
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296 info.
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297 play.
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diff changeset
298 pause
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diff changeset
299 ?
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300 "yes"
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diff changeset
301 :
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302 "no",
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diff changeset
303 info.
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304 play.
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305 error
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diff changeset
306 ?
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diff changeset
307 "yes"
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diff changeset
308 :
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309 "no",
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310 info.
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311 play.waiting ? "yes" : "no", info.play.active ? "yes" : "no");
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312
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313 fprintf(stderr, "\n"
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314 "[audio info]\n"
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315 "monitor_gain : %i\n"
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316 "hw block size : %d bytes\n"
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diff changeset
317 "hi watermark : %i\n"
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diff changeset
318 "lo watermark : %i\n"
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319 "audio mode : %s\n"
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320 "",
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321 info.monitor_gain,
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322 info.blocksize,
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diff changeset
323 info.hiwat, info.lowat,
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324 (info.mode == AUMODE_PLAY) ? "PLAY"
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325 : (info.mode = AUMODE_RECORD) ? "RECORD"
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326 : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" : "?"));
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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327 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
328 #endif /* DEBUG_AUDIO */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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329
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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330 static int
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331 OBSD_OpenAudio(_THIS, SDL_AudioSpec * spec)
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diff changeset
332 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
333 char audiodev[64];
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parents:
diff changeset
334 Uint16 format;
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335 audio_info_t info;
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336
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337 AUDIO_INITINFO(&info);
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338
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339 /* Calculate the final parameters for this audio specification */
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340 SDL_CalculateAudioSpec(spec);
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341
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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parents:
diff changeset
342 #ifdef USE_TIMER_SYNC
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343 frame_ticks = 0.0;
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diff changeset
344 #endif
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345
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diff changeset
346 /* Open the audio device */
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347 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
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348 if (audio_fd < 0) {
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349 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
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350 return (-1);
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parents:
diff changeset
351 }
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diff changeset
352
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diff changeset
353 /* Set to play mode */
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354 info.mode = AUMODE_PLAY;
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355 if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) {
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356 SDL_SetError("Couldn't put device into play mode");
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357 return (-1);
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
358 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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parents:
diff changeset
359
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360 mixbuf = NULL;
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361 AUDIO_INITINFO(&info);
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362 for (format = SDL_FirstAudioFormat(spec->format);
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363 format; format = SDL_NextAudioFormat()) {
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diff changeset
364 switch (format) {
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diff changeset
365 case AUDIO_U8:
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366 info.play.encoding = AUDIO_ENCODING_ULINEAR;
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367 info.play.precision = 8;
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diff changeset
368 break;
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369 case AUDIO_S8:
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370 info.play.encoding = AUDIO_ENCODING_SLINEAR;
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diff changeset
371 info.play.precision = 8;
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parents: 1583
diff changeset
372 break;
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diff changeset
373 case AUDIO_S16LSB:
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diff changeset
374 info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
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diff changeset
375 info.play.precision = 16;
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diff changeset
376 break;
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parents: 1583
diff changeset
377 case AUDIO_S16MSB:
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diff changeset
378 info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
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diff changeset
379 info.play.precision = 16;
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diff changeset
380 break;
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diff changeset
381 case AUDIO_U16LSB:
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diff changeset
382 info.play.encoding = AUDIO_ENCODING_ULINEAR_LE;
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diff changeset
383 info.play.precision = 16;
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Sam Lantinga <slouken@libsdl.org>
parents: 1583
diff changeset
384 break;
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Sam Lantinga <slouken@libsdl.org>
parents: 1583
diff changeset
385 case AUDIO_U16MSB:
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parents: 1583
diff changeset
386 info.play.encoding = AUDIO_ENCODING_ULINEAR_BE;
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diff changeset
387 info.play.precision = 16;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
388 break;
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diff changeset
389 default:
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parents: 1583
diff changeset
390 continue;
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
391 }
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392 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0)
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diff changeset
393 break;
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parents: 1583
diff changeset
394 }
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
Sam Lantinga <slouken@libsdl.org>
parents: 1583
diff changeset
395
782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
396 if (!format) {
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397 SDL_SetError("No supported encoding for 0x%x", spec->format);
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diff changeset
398 return (-1);
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
399 }
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
400
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
401 spec->format = format;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
402
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403 AUDIO_INITINFO(&info);
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
404 info.play.channels = spec->channels;
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diff changeset
405 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1)
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782fd950bd46 Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API.
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diff changeset
406 spec->channels = 1;
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diff changeset
407 AUDIO_INITINFO(&info);
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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408 info.play.sample_rate = spec->freq;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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409 info.blocksize = spec->size;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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410 info.hiwat = 5;
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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411 info.lowat = 3;
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412 (void) ioctl(audio_fd, AUDIO_SETINFO, &info);
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413 (void) ioctl(audio_fd, AUDIO_GETINFO, &info);
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414 spec->freq = info.play.sample_rate;
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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415 /* Allocate mixing buffer */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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416 mixlen = spec->size;
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417 mixbuf = (Uint8 *) SDL_AllocAudioMem(mixlen);
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418 if (mixbuf == NULL) {
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419 return (-1);
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420 }
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421 SDL_memset(mixbuf, spec->silence, spec->size);
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422
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423 /* Get the parent process id (we're the parent of the audio thread) */
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424 parent = getpid();
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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425
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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426 #ifdef DEBUG_AUDIO
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427 OBSD_Status(this);
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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428 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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429
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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430 /* We're ready to rock and roll. :-) */
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431 return (0);
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432 }
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433
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434 /* vi: set ts=4 sw=4 expandtab: */