Mercurial > sdl-ios-xcode
annotate src/audio/dsp/SDL_dspaudio.c @ 4135:cd98d1dc385c SDL-1.2
Damien Carbery fixed bug #542
In SDL 1.2.13 sdl.m4 the AM_PATH_SDL function looks for sdl-config.
It sets the PATH:
PATH="$prefix/bin:$prefix/usr/bin:$PATH"
but does not save the current PATH or restore the current PATH at the end.
This breaks the build on Solaris because we have GNU tools in another dir
(listed at the top of PATH) but non-GNU tools with the same names in
$prefix/bin. Later configure tests finds the non-GNU tools and quits in error
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 24 Jan 2008 15:50:20 +0000 |
| parents | aeb55f698ee3 |
| children | a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 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 |
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21 |
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22 Modified in Oct 2004 by Hannu Savolainen |
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23 hannu@opensound.com |
| 0 | 24 */ |
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25 #include "SDL_config.h" |
| 0 | 26 |
| 27 /* Allow access to a raw mixing buffer */ | |
| 28 | |
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29 #include <stdio.h> /* For perror() */ |
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30 #include <string.h> /* For strerror() */ |
| 0 | 31 #include <errno.h> |
| 32 #include <unistd.h> | |
| 33 #include <fcntl.h> | |
| 34 #include <signal.h> | |
| 35 #include <sys/time.h> | |
| 36 #include <sys/ioctl.h> | |
| 37 #include <sys/stat.h> | |
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38 |
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39 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H |
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40 /* This is installed on some systems */ |
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41 #include <soundcard.h> |
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42 #else |
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43 /* This is recommended by OSS */ |
| 0 | 44 #include <sys/soundcard.h> |
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45 #endif |
| 0 | 46 |
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47 #include "SDL_timer.h" |
| 0 | 48 #include "SDL_audio.h" |
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49 #include "../SDL_audiomem.h" |
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50 #include "../SDL_audio_c.h" |
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51 #include "../SDL_audiodev_c.h" |
| 0 | 52 #include "SDL_dspaudio.h" |
| 53 | |
| 54 /* The tag name used by DSP audio */ | |
| 55 #define DSP_DRIVER_NAME "dsp" | |
| 56 | |
| 57 /* Open the audio device for playback, and don't block if busy */ | |
| 58 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) | |
| 59 | |
| 60 /* Audio driver functions */ | |
| 61 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 62 static void DSP_WaitAudio(_THIS); | |
| 63 static void DSP_PlayAudio(_THIS); | |
| 64 static Uint8 *DSP_GetAudioBuf(_THIS); | |
| 65 static void DSP_CloseAudio(_THIS); | |
| 66 | |
| 67 /* Audio driver bootstrap functions */ | |
| 68 | |
| 69 static int Audio_Available(void) | |
| 70 { | |
| 71 int fd; | |
| 72 int available; | |
| 73 | |
| 74 available = 0; | |
| 75 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); | |
| 76 if ( fd >= 0 ) { | |
| 77 available = 1; | |
| 78 close(fd); | |
| 79 } | |
| 80 return(available); | |
| 81 } | |
| 82 | |
| 83 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 84 { | |
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85 SDL_free(device->hidden); |
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86 SDL_free(device); |
| 0 | 87 } |
| 88 | |
| 89 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 90 { | |
| 91 SDL_AudioDevice *this; | |
| 92 | |
| 93 /* Initialize all variables that we clean on shutdown */ | |
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94 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 95 if ( this ) { |
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96 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 97 this->hidden = (struct SDL_PrivateAudioData *) |
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98 SDL_malloc((sizeof *this->hidden)); |
| 0 | 99 } |
| 100 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 101 SDL_OutOfMemory(); | |
| 102 if ( this ) { | |
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103 SDL_free(this); |
| 0 | 104 } |
| 105 return(0); | |
| 106 } | |
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107 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 108 audio_fd = -1; |
| 109 | |
| 110 /* Set the function pointers */ | |
| 111 this->OpenAudio = DSP_OpenAudio; | |
| 112 this->WaitAudio = DSP_WaitAudio; | |
| 113 this->PlayAudio = DSP_PlayAudio; | |
| 114 this->GetAudioBuf = DSP_GetAudioBuf; | |
| 115 this->CloseAudio = DSP_CloseAudio; | |
| 116 | |
| 117 this->free = Audio_DeleteDevice; | |
| 118 | |
| 119 return this; | |
| 120 } | |
| 121 | |
| 122 AudioBootStrap DSP_bootstrap = { | |
| 123 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio", | |
| 124 Audio_Available, Audio_CreateDevice | |
| 125 }; | |
| 126 | |
| 127 /* This function waits until it is possible to write a full sound buffer */ | |
| 128 static void DSP_WaitAudio(_THIS) | |
| 129 { | |
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130 /* Not needed at all since OSS handles waiting automagically */ |
| 0 | 131 } |
| 132 | |
| 133 static void DSP_PlayAudio(_THIS) | |
| 134 { | |
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135 if (write(audio_fd, mixbuf, mixlen)==-1) |
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136 { |
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137 perror("Audio write"); |
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138 this->enabled = 0; |
| 0 | 139 } |
| 140 | |
| 141 #ifdef DEBUG_AUDIO | |
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142 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen); |
| 0 | 143 #endif |
| 144 } | |
| 145 | |
| 146 static Uint8 *DSP_GetAudioBuf(_THIS) | |
| 147 { | |
| 148 return(mixbuf); | |
| 149 } | |
| 150 | |
| 151 static void DSP_CloseAudio(_THIS) | |
| 152 { | |
| 153 if ( mixbuf != NULL ) { | |
| 154 SDL_FreeAudioMem(mixbuf); | |
| 155 mixbuf = NULL; | |
| 156 } | |
| 157 if ( audio_fd >= 0 ) { | |
| 158 close(audio_fd); | |
| 159 audio_fd = -1; | |
| 160 } | |
| 161 } | |
| 162 | |
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163 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 0 | 164 { |
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165 char audiodev[1024]; |
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166 int format; |
| 0 | 167 int value; |
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168 int frag_spec; |
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169 Uint16 test_format; |
| 0 | 170 |
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171 /* Make sure fragment size stays a power of 2, or OSS fails. */ |
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172 /* I don't know which of these are actually legal values, though... */ |
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173 if (spec->channels > 8) |
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174 spec->channels = 8; |
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175 else if (spec->channels > 4) |
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176 spec->channels = 4; |
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177 else if (spec->channels > 2) |
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178 spec->channels = 2; |
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179 |
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180 /* Open the audio device */ |
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181 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| 0 | 182 if ( audio_fd < 0 ) { |
| 183 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | |
| 184 return(-1); | |
| 185 } | |
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186 mixbuf = NULL; |
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187 |
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188 /* Make the file descriptor use blocking writes with fcntl() */ |
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189 { long flags; |
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190 flags = fcntl(audio_fd, F_GETFL); |
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191 flags &= ~O_NONBLOCK; |
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192 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) { |
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193 SDL_SetError("Couldn't set audio blocking mode"); |
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194 DSP_CloseAudio(this); |
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195 return(-1); |
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196 } |
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197 } |
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198 |
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199 /* Get a list of supported hardware formats */ |
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200 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { |
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201 perror("SNDCTL_DSP_GETFMTS"); |
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202 SDL_SetError("Couldn't get audio format list"); |
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203 DSP_CloseAudio(this); |
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204 return(-1); |
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205 } |
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206 |
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207 /* Try for a closest match on audio format */ |
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208 format = 0; |
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209 for ( test_format = SDL_FirstAudioFormat(spec->format); |
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210 ! format && test_format; ) { |
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211 #ifdef DEBUG_AUDIO |
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212 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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213 #endif |
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214 switch ( test_format ) { |
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215 case AUDIO_U8: |
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216 if ( value & AFMT_U8 ) { |
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217 format = AFMT_U8; |
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218 } |
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219 break; |
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220 case AUDIO_S16LSB: |
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221 if ( value & AFMT_S16_LE ) { |
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222 format = AFMT_S16_LE; |
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223 } |
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224 break; |
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225 case AUDIO_S16MSB: |
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226 if ( value & AFMT_S16_BE ) { |
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227 format = AFMT_S16_BE; |
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228 } |
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229 break; |
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230 #if 0 |
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231 /* |
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232 * These formats are not used by any real life systems so they are not |
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233 * needed here. |
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234 */ |
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235 case AUDIO_S8: |
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236 if ( value & AFMT_S8 ) { |
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237 format = AFMT_S8; |
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238 } |
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239 break; |
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240 case AUDIO_U16LSB: |
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241 if ( value & AFMT_U16_LE ) { |
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242 format = AFMT_U16_LE; |
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243 } |
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244 break; |
|
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245 case AUDIO_U16MSB: |
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246 if ( value & AFMT_U16_BE ) { |
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247 format = AFMT_U16_BE; |
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248 } |
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249 break; |
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250 #endif |
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251 default: |
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252 format = 0; |
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253 break; |
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254 } |
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255 if ( ! format ) { |
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256 test_format = SDL_NextAudioFormat(); |
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257 } |
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258 } |
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259 if ( format == 0 ) { |
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260 SDL_SetError("Couldn't find any hardware audio formats"); |
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261 DSP_CloseAudio(this); |
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262 return(-1); |
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263 } |
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264 spec->format = test_format; |
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265 |
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266 /* Set the audio format */ |
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267 value = format; |
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268 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || |
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269 (value != format) ) { |
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270 perror("SNDCTL_DSP_SETFMT"); |
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271 SDL_SetError("Couldn't set audio format"); |
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272 DSP_CloseAudio(this); |
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273 return(-1); |
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274 } |
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275 |
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276 /* Set the number of channels of output */ |
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277 value = spec->channels; |
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278 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) { |
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279 perror("SNDCTL_DSP_CHANNELS"); |
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280 SDL_SetError("Cannot set the number of channels"); |
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281 DSP_CloseAudio(this); |
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282 return(-1); |
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283 } |
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284 spec->channels = value; |
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285 |
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286 /* Set the DSP frequency */ |
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287 value = spec->freq; |
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288 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { |
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289 perror("SNDCTL_DSP_SPEED"); |
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290 SDL_SetError("Couldn't set audio frequency"); |
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291 DSP_CloseAudio(this); |
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292 return(-1); |
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293 } |
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294 spec->freq = value; |
| 0 | 295 |
| 296 /* Calculate the final parameters for this audio specification */ | |
| 297 SDL_CalculateAudioSpec(spec); | |
| 298 | |
| 299 /* Determine the power of two of the fragment size */ | |
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300 for ( frag_spec = 0; (0x01U<<frag_spec) < spec->size; ++frag_spec ); |
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301 if ( (0x01U<<frag_spec) != spec->size ) { |
| 0 | 302 SDL_SetError("Fragment size must be a power of two"); |
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303 DSP_CloseAudio(this); |
| 0 | 304 return(-1); |
| 305 } | |
| 306 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 307 | |
| 308 /* Set the audio buffering parameters */ | |
| 309 #ifdef DEBUG_AUDIO | |
| 310 fprintf(stderr, "Requesting %d fragments of size %d\n", | |
| 311 (frag_spec >> 16), 1<<(frag_spec&0xFFFF)); | |
| 312 #endif | |
| 313 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { | |
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314 perror("SNDCTL_DSP_SETFRAGMENT"); |
| 0 | 315 } |
| 316 #ifdef DEBUG_AUDIO | |
| 317 { audio_buf_info info; | |
| 318 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info); | |
| 319 fprintf(stderr, "fragments = %d\n", info.fragments); | |
| 320 fprintf(stderr, "fragstotal = %d\n", info.fragstotal); | |
| 321 fprintf(stderr, "fragsize = %d\n", info.fragsize); | |
| 322 fprintf(stderr, "bytes = %d\n", info.bytes); | |
| 323 } | |
| 324 #endif | |
| 325 | |
| 326 /* Allocate mixing buffer */ | |
| 327 mixlen = spec->size; | |
| 328 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 329 if ( mixbuf == NULL ) { | |
|
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330 DSP_CloseAudio(this); |
| 0 | 331 return(-1); |
| 332 } | |
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333 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 334 |
| 335 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 336 parent = getpid(); | |
| 337 | |
| 338 /* We're ready to rock and roll. :-) */ | |
| 339 return(0); | |
| 340 } |