Mercurial > sdl-ios-xcode

annotate src/audio/bsd/SDL_bsdaudio.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
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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diff changeset
286 encoding,
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diff changeset
287 info.
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288 play.
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diff changeset
289 seek,
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diff changeset
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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diff changeset
296 info.
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diff changeset
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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diff changeset
302 "no",
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diff changeset
303 info.
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diff changeset
304 play.
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diff changeset
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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diff changeset
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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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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312
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313 fprintf(stderr, "\n"
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diff changeset
314 "[audio info]\n"
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315 "monitor_gain : %i\n"
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diff changeset
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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diff changeset
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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parents:
diff changeset
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.
Sam Lantinga <slouken@libsdl.org>
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330 static int
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331 OBSD_OpenAudio(_THIS, SDL_AudioSpec * spec)
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parents:
diff changeset
332 {
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
333 char audiodev[64];
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
334 Uint16 format;
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parents:
diff changeset
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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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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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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parents:
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341
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
342 #ifdef USE_TIMER_SYNC
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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parents:
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343 frame_ticks = 0.0;
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parents:
diff changeset
344 #endif
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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parents:
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345
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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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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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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parents:
diff changeset
351 }
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diff changeset
352
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12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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diff changeset
353 /* Set to play mode */
12b6d331d82a Good idea, renaming OpenBSD audio to BSD audio.
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parents:
diff changeset
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.
Sam Lantinga <slouken@libsdl.org>
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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parents: 1583
diff changeset
365 case AUDIO_U8:
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
366 info.play.encoding = AUDIO_ENCODING_ULINEAR;
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diff changeset
367 info.play.precision = 8;
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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parents: 1583
diff changeset
368 break;
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diff changeset
369 case AUDIO_S8:
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diff changeset
370 info.play.encoding = AUDIO_ENCODING_SLINEAR;
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diff changeset
371 info.play.precision = 8;
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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parents: 1583
diff changeset
372 break;
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parents: 1583
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;
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
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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Sam Lantinga <slouken@libsdl.org>
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diff changeset
383 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.
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:
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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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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parents: 1583
diff changeset
388 break;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
389 default:
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Sam Lantinga <slouken@libsdl.org>
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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Sam Lantinga <slouken@libsdl.org>
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);
1567
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);
1567
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)
1662
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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406 spec->channels = 1;
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407 AUDIO_INITINFO(&info);
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408 info.play.sample_rate = spec->freq;
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409 info.blocksize = spec->size;
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410 info.hiwat = 5;
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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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415 /* Allocate mixing buffer */
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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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425
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426 #ifdef DEBUG_AUDIO
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427 OBSD_Status(this);
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428 #endif
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429
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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: */