Mercurial > sdl-ios-xcode
annotate src/audio/sun/SDL_sunaudio.c @ 3798:c8b3d3d13ed1 SDL-ryan-multiple-audio-device
Audio bootstraps can now specify that a driver is only to be used if
explicitly requested (for things like the "disk" driver that is always
available but you would never want to default to using).
Trimmed out code that can be handled by stubs in the core. The "dummy" driver
is pretty damned small now. :)
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Wed, 04 Oct 2006 21:27:53 +0000 |
parents | 152dcc2f089f |
children | 332a59e39ce1 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
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 Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* Allow access to a raw mixing buffer */ | |
25 | |
26 #include <fcntl.h> | |
27 #include <errno.h> | |
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28 #ifdef __NETBSD__ |
0 | 29 #include <sys/ioctl.h> |
30 #include <sys/audioio.h> | |
31 #endif | |
32 #ifdef __SVR4 | |
33 #include <sys/audioio.h> | |
34 #else | |
35 #include <sys/time.h> | |
36 #include <sys/types.h> | |
37 #endif | |
38 #include <unistd.h> | |
39 | |
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40 #include "SDL_timer.h" |
0 | 41 #include "SDL_audio.h" |
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42 #include "../SDL_audiomem.h" |
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43 #include "../SDL_audio_c.h" |
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44 #include "../SDL_audiodev_c.h" |
0 | 45 #include "SDL_sunaudio.h" |
46 | |
47 /* Open the audio device for playback, and don't block if busy */ | |
48 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) | |
49 | |
50 /* Audio driver functions */ | |
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51 static int DSP_OpenAudio(_THIS, SDL_AudioSpec * spec); |
0 | 52 static void DSP_WaitAudio(_THIS); |
53 static void DSP_PlayAudio(_THIS); | |
54 static Uint8 *DSP_GetAudioBuf(_THIS); | |
55 static void DSP_CloseAudio(_THIS); | |
56 | |
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57 static Uint8 snd2au(int sample); |
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58 |
0 | 59 /* Audio driver bootstrap functions */ |
60 | |
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61 static int |
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62 Audio_Available(void) |
0 | 63 { |
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64 int fd; |
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65 int available; |
0 | 66 |
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67 available = 0; |
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68 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 1); |
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69 if (fd >= 0) { |
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70 available = 1; |
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71 close(fd); |
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72 } |
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73 return (available); |
0 | 74 } |
75 | |
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76 static void |
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77 Audio_DeleteDevice(SDL_AudioDevice * device) |
0 | 78 { |
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79 SDL_free(device->hidden); |
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80 SDL_free(device); |
0 | 81 } |
82 | |
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83 static SDL_AudioDevice * |
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84 Audio_CreateDevice(int devindex) |
0 | 85 { |
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86 SDL_AudioDevice *this; |
0 | 87 |
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88 /* Initialize all variables that we clean on shutdown */ |
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89 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice)); |
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90 if (this) { |
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91 SDL_memset(this, 0, (sizeof *this)); |
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92 this->hidden = (struct SDL_PrivateAudioData *) |
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93 SDL_malloc((sizeof *this->hidden)); |
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94 } |
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95 if ((this == NULL) || (this->hidden == NULL)) { |
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96 SDL_OutOfMemory(); |
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97 if (this) { |
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98 SDL_free(this); |
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99 } |
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100 return (0); |
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101 } |
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102 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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103 audio_fd = -1; |
0 | 104 |
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105 /* Set the function pointers */ |
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106 this->OpenAudio = DSP_OpenAudio; |
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107 this->WaitAudio = DSP_WaitAudio; |
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108 this->PlayAudio = DSP_PlayAudio; |
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109 this->GetAudioBuf = DSP_GetAudioBuf; |
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110 this->CloseAudio = DSP_CloseAudio; |
0 | 111 |
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112 this->free = Audio_DeleteDevice; |
0 | 113 |
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114 return this; |
0 | 115 } |
116 | |
148
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117 AudioBootStrap SUNAUDIO_bootstrap = { |
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118 "audio", "UNIX /dev/audio interface", |
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119 Audio_Available, Audio_CreateDevice, 0 |
0 | 120 }; |
121 | |
122 #ifdef DEBUG_AUDIO | |
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123 void |
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124 CheckUnderflow(_THIS) |
0 | 125 { |
126 #ifdef AUDIO_GETINFO | |
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127 audio_info_t info; |
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128 int left; |
0 | 129 |
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130 ioctl(audio_fd, AUDIO_GETINFO, &info); |
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131 left = (written - info.play.samples); |
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132 if (written && (left == 0)) { |
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133 fprintf(stderr, "audio underflow!\n"); |
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134 } |
0 | 135 #endif |
136 } | |
137 #endif | |
138 | |
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139 void |
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140 DSP_WaitAudio(_THIS) |
0 | 141 { |
142 #ifdef AUDIO_GETINFO | |
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143 #define SLEEP_FUDGE 10 /* 10 ms scheduling fudge factor */ |
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144 audio_info_t info; |
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145 Sint32 left; |
0 | 146 |
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147 ioctl(audio_fd, AUDIO_GETINFO, &info); |
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148 left = (written - info.play.samples); |
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149 if (left > fragsize) { |
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150 Sint32 sleepy; |
0 | 151 |
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152 sleepy = ((left - fragsize) / frequency); |
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153 sleepy -= SLEEP_FUDGE; |
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154 if (sleepy > 0) { |
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155 SDL_Delay(sleepy); |
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156 } |
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157 } |
0 | 158 #else |
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159 fd_set fdset; |
0 | 160 |
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161 FD_ZERO(&fdset); |
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162 FD_SET(audio_fd, &fdset); |
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163 select(audio_fd + 1, NULL, &fdset, NULL, NULL); |
0 | 164 #endif |
165 } | |
166 | |
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167 void |
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168 DSP_PlayAudio(_THIS) |
0 | 169 { |
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170 /* Write the audio data */ |
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171 if (ulaw_only) { |
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172 /* Assuming that this->spec.freq >= 8000 Hz */ |
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173 int accum, incr, pos; |
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174 Uint8 *aubuf; |
0 | 175 |
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176 accum = 0; |
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177 incr = this->spec.freq / 8; |
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178 aubuf = ulaw_buf; |
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179 switch (audio_fmt & 0xFF) { |
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180 case 8: |
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181 { |
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182 Uint8 *sndbuf; |
0 | 183 |
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184 sndbuf = mixbuf; |
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185 for (pos = 0; pos < fragsize; ++pos) { |
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186 *aubuf = snd2au((0x80 - *sndbuf) * 64); |
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187 accum += incr; |
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188 while (accum > 0) { |
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189 accum -= 1000; |
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190 sndbuf += 1; |
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191 } |
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192 aubuf += 1; |
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193 } |
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194 } |
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195 break; |
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196 case 16: |
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197 { |
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198 Sint16 *sndbuf; |
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199 |
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200 sndbuf = (Sint16 *) mixbuf; |
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201 for (pos = 0; pos < fragsize; ++pos) { |
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202 *aubuf = snd2au(*sndbuf / 4); |
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203 accum += incr; |
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204 while (accum > 0) { |
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205 accum -= 1000; |
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206 sndbuf += 1; |
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207 } |
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208 aubuf += 1; |
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209 } |
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210 } |
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211 break; |
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212 } |
0 | 213 #ifdef DEBUG_AUDIO |
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214 CheckUnderflow(this); |
0 | 215 #endif |
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216 if (write(audio_fd, ulaw_buf, fragsize) < 0) { |
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217 /* Assume fatal error, for now */ |
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218 this->enabled = 0; |
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219 } |
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220 written += fragsize; |
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221 } else { |
0 | 222 #ifdef DEBUG_AUDIO |
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223 CheckUnderflow(this); |
0 | 224 #endif |
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225 if (write(audio_fd, mixbuf, this->spec.size) < 0) { |
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226 /* Assume fatal error, for now */ |
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227 this->enabled = 0; |
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228 } |
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229 written += fragsize; |
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230 } |
0 | 231 } |
232 | |
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233 Uint8 * |
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234 DSP_GetAudioBuf(_THIS) |
0 | 235 { |
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236 return (mixbuf); |
0 | 237 } |
238 | |
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239 void |
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240 DSP_CloseAudio(_THIS) |
0 | 241 { |
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242 if (mixbuf != NULL) { |
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243 SDL_FreeAudioMem(mixbuf); |
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244 mixbuf = NULL; |
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245 } |
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246 if (ulaw_buf != NULL) { |
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247 SDL_free(ulaw_buf); |
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248 ulaw_buf = NULL; |
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249 } |
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250 close(audio_fd); |
0 | 251 } |
252 | |
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253 int |
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254 DSP_OpenAudio(_THIS, SDL_AudioSpec * spec) |
0 | 255 { |
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256 char audiodev[1024]; |
0 | 257 #ifdef AUDIO_SETINFO |
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258 int enc; |
0 | 259 #endif |
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260 int desired_freq = spec->freq; |
0 | 261 |
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262 /* Initialize our freeable variables, in case we fail */ |
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263 audio_fd = -1; |
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264 mixbuf = NULL; |
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265 ulaw_buf = NULL; |
0 | 266 |
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267 /* Determine the audio parameters from the AudioSpec */ |
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268 switch (SDL_AUDIO_BITSIZE(spec->format)) { |
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269 |
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270 case 8: |
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271 { /* Unsigned 8 bit audio data */ |
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272 spec->format = AUDIO_U8; |
0 | 273 #ifdef AUDIO_SETINFO |
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274 enc = AUDIO_ENCODING_LINEAR8; |
0 | 275 #endif |
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276 } |
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277 break; |
0 | 278 |
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279 case 16: |
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280 { /* Signed 16 bit audio data */ |
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281 spec->format = AUDIO_S16SYS; |
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282 #ifdef AUDIO_SETINFO |
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283 enc = AUDIO_ENCODING_LINEAR; |
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284 #endif |
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285 } |
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286 break; |
0 | 287 |
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288 default: |
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289 { |
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290 /* !!! FIXME: fallback to conversion on unsupported types! */ |
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291 SDL_SetError("Unsupported audio format"); |
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292 return (-1); |
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293 } |
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294 } |
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295 audio_fmt = spec->format; |
0 | 296 |
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297 /* Open the audio device */ |
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298 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 1); |
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299 if (audio_fd < 0) { |
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300 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
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301 return (-1); |
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302 } |
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303 |
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304 ulaw_only = 0; /* modern Suns do support linear audio */ |
0 | 305 #ifdef AUDIO_SETINFO |
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306 for (;;) { |
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307 audio_info_t info; |
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308 AUDIO_INITINFO(&info); /* init all fields to "no change" */ |
0 | 309 |
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310 /* Try to set the requested settings */ |
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311 info.play.sample_rate = spec->freq; |
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312 info.play.channels = spec->channels; |
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313 info.play.precision = (enc == AUDIO_ENCODING_ULAW) |
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314 ? 8 : spec->format & 0xff; |
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315 info.play.encoding = enc; |
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316 if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0) { |
0 | 317 |
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318 /* Check to be sure we got what we wanted */ |
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319 if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
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320 SDL_SetError("Error getting audio parameters: %s", |
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321 strerror(errno)); |
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322 return -1; |
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323 } |
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324 if (info.play.encoding == enc |
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325 && info.play.precision == (spec->format & 0xff) |
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326 && info.play.channels == spec->channels) { |
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327 /* Yow! All seems to be well! */ |
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328 spec->freq = info.play.sample_rate; |
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329 break; |
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330 } |
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331 } |
0 | 332 |
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333 switch (enc) { |
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334 case AUDIO_ENCODING_LINEAR8: |
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335 /* unsigned 8bit apparently not supported here */ |
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336 enc = AUDIO_ENCODING_LINEAR; |
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337 spec->format = AUDIO_S16SYS; |
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338 break; /* try again */ |
0 | 339 |
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340 case AUDIO_ENCODING_LINEAR: |
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341 /* linear 16bit didn't work either, resort to µ-law */ |
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342 enc = AUDIO_ENCODING_ULAW; |
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343 spec->channels = 1; |
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344 spec->freq = 8000; |
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345 spec->format = AUDIO_U8; |
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346 ulaw_only = 1; |
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347 break; |
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348 |
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349 default: |
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350 /* oh well... */ |
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351 SDL_SetError("Error setting audio parameters: %s", |
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352 strerror(errno)); |
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353 return -1; |
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354 } |
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355 } |
0 | 356 #endif /* AUDIO_SETINFO */ |
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357 written = 0; |
0 | 358 |
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359 /* We can actually convert on-the-fly to U-Law */ |
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360 if (ulaw_only) { |
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361 spec->freq = desired_freq; |
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362 fragsize = (spec->samples * 1000) / (spec->freq / 8); |
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363 frequency = 8; |
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364 ulaw_buf = (Uint8 *) SDL_malloc(fragsize); |
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365 if (ulaw_buf == NULL) { |
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366 SDL_OutOfMemory(); |
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367 return (-1); |
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368 } |
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369 spec->channels = 1; |
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370 } else { |
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371 fragsize = spec->samples; |
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372 frequency = spec->freq / 1000; |
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373 } |
0 | 374 #ifdef DEBUG_AUDIO |
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375 fprintf(stderr, "Audio device %s U-Law only\n", |
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376 ulaw_only ? "is" : "is not"); |
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377 fprintf(stderr, "format=0x%x chan=%d freq=%d\n", |
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378 spec->format, spec->channels, spec->freq); |
0 | 379 #endif |
380 | |
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381 /* Update the fragment size as size in bytes */ |
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382 SDL_CalculateAudioSpec(spec); |
0 | 383 |
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384 /* Allocate mixing buffer */ |
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385 mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size); |
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386 if (mixbuf == NULL) { |
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387 SDL_OutOfMemory(); |
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388 return (-1); |
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389 } |
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390 SDL_memset(mixbuf, spec->silence, spec->size); |
0 | 391 |
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392 /* We're ready to rock and roll. :-) */ |
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393 return (0); |
0 | 394 } |
395 | |
396 /************************************************************************/ | |
397 /* This function (snd2au()) copyrighted: */ | |
398 /************************************************************************/ | |
399 /* Copyright 1989 by Rich Gopstein and Harris Corporation */ | |
400 /* */ | |
401 /* Permission to use, copy, modify, and distribute this software */ | |
402 /* and its documentation for any purpose and without fee is */ | |
403 /* hereby granted, provided that the above copyright notice */ | |
404 /* appears in all copies and that both that copyright notice and */ | |
405 /* this permission notice appear in supporting documentation, and */ | |
406 /* that the name of Rich Gopstein and Harris Corporation not be */ | |
407 /* used in advertising or publicity pertaining to distribution */ | |
408 /* of the software without specific, written prior permission. */ | |
409 /* Rich Gopstein and Harris Corporation make no representations */ | |
410 /* about the suitability of this software for any purpose. It */ | |
411 /* provided "as is" without express or implied warranty. */ | |
412 /************************************************************************/ | |
413 | |
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414 static Uint8 |
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415 snd2au(int sample) |
0 | 416 { |
417 | |
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418 int mask; |
0 | 419 |
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420 if (sample < 0) { |
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421 sample = -sample; |
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422 mask = 0x7f; |
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423 } else { |
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424 mask = 0xff; |
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425 } |
0 | 426 |
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427 if (sample < 32) { |
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428 sample = 0xF0 | (15 - sample / 2); |
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429 } else if (sample < 96) { |
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430 sample = 0xE0 | (15 - (sample - 32) / 4); |
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431 } else if (sample < 224) { |
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432 sample = 0xD0 | (15 - (sample - 96) / 8); |
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433 } else if (sample < 480) { |
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434 sample = 0xC0 | (15 - (sample - 224) / 16); |
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435 } else if (sample < 992) { |
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436 sample = 0xB0 | (15 - (sample - 480) / 32); |
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437 } else if (sample < 2016) { |
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438 sample = 0xA0 | (15 - (sample - 992) / 64); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
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439 } else if (sample < 4064) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
440 sample = 0x90 | (15 - (sample - 2016) / 128); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
441 } else if (sample < 8160) { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
442 sample = 0x80 | (15 - (sample - 4064) / 256); |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
443 } else { |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
444 sample = 0x80; |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
445 } |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
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446 return (mask & sample); |
0 | 447 } |
1895
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
448 |
c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
1464
diff
changeset
|
449 /* vi: set ts=4 sw=4 expandtab: */ |