Mercurial > sdl-ios-xcode
annotate src/audio/dsp/SDL_dspaudio.c @ 1245:fe7d081a4955
Patched to compile with debugging enabled.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 13 Jan 2006 01:30:21 +0000 |
| parents | c5dedfdb4e42 |
| children | 644b39bf7253 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 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 */ |
| 25 | |
| 26 #ifdef SAVE_RCSID | |
| 27 static char rcsid = | |
| 28 "@(#) $Id$"; | |
| 29 #endif | |
| 30 | |
| 31 /* Allow access to a raw mixing buffer */ | |
| 32 | |
| 33 #include <stdlib.h> | |
| 34 #include <stdio.h> | |
| 35 #include <string.h> | |
| 36 #include <errno.h> | |
| 37 #include <unistd.h> | |
| 38 #include <fcntl.h> | |
| 39 #include <signal.h> | |
| 40 #include <sys/time.h> | |
| 41 #include <sys/ioctl.h> | |
| 42 #include <sys/stat.h> | |
|
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43 #ifdef OSS_USE_SOUNDCARD_H |
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44 /* This is installed on some systems */ |
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45 #include <soundcard.h> |
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46 #else |
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47 /* This is recommended by OSS */ |
| 0 | 48 #include <sys/soundcard.h> |
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49 #endif |
| 0 | 50 |
| 51 #include "SDL_audio.h" | |
| 52 #include "SDL_error.h" | |
| 53 #include "SDL_audiomem.h" | |
| 54 #include "SDL_audio_c.h" | |
| 55 #include "SDL_timer.h" | |
| 56 #include "SDL_audiodev_c.h" | |
| 57 #include "SDL_dspaudio.h" | |
| 58 | |
| 59 /* The tag name used by DSP audio */ | |
| 60 #define DSP_DRIVER_NAME "dsp" | |
| 61 | |
| 62 /* Open the audio device for playback, and don't block if busy */ | |
| 63 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) | |
| 64 | |
| 65 /* Audio driver functions */ | |
| 66 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 67 static void DSP_WaitAudio(_THIS); | |
| 68 static void DSP_PlayAudio(_THIS); | |
| 69 static Uint8 *DSP_GetAudioBuf(_THIS); | |
| 70 static void DSP_CloseAudio(_THIS); | |
| 71 | |
| 72 /* Audio driver bootstrap functions */ | |
| 73 | |
| 74 static int Audio_Available(void) | |
| 75 { | |
| 76 int fd; | |
| 77 int available; | |
| 78 | |
| 79 available = 0; | |
| 80 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); | |
| 81 if ( fd >= 0 ) { | |
| 82 available = 1; | |
| 83 close(fd); | |
| 84 } | |
| 85 return(available); | |
| 86 } | |
| 87 | |
| 88 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 89 { | |
| 90 free(device->hidden); | |
| 91 free(device); | |
| 92 } | |
| 93 | |
| 94 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 95 { | |
| 96 SDL_AudioDevice *this; | |
| 97 | |
| 98 /* Initialize all variables that we clean on shutdown */ | |
| 99 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 100 if ( this ) { | |
| 101 memset(this, 0, (sizeof *this)); | |
| 102 this->hidden = (struct SDL_PrivateAudioData *) | |
| 103 malloc((sizeof *this->hidden)); | |
| 104 } | |
| 105 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 106 SDL_OutOfMemory(); | |
| 107 if ( this ) { | |
| 108 free(this); | |
| 109 } | |
| 110 return(0); | |
| 111 } | |
| 112 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 113 audio_fd = -1; | |
| 114 | |
| 115 /* Set the function pointers */ | |
| 116 this->OpenAudio = DSP_OpenAudio; | |
| 117 this->WaitAudio = DSP_WaitAudio; | |
| 118 this->PlayAudio = DSP_PlayAudio; | |
| 119 this->GetAudioBuf = DSP_GetAudioBuf; | |
| 120 this->CloseAudio = DSP_CloseAudio; | |
| 121 | |
| 122 this->free = Audio_DeleteDevice; | |
| 123 | |
| 124 return this; | |
| 125 } | |
| 126 | |
| 127 AudioBootStrap DSP_bootstrap = { | |
| 128 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio", | |
| 129 Audio_Available, Audio_CreateDevice | |
| 130 }; | |
| 131 | |
| 132 /* This function waits until it is possible to write a full sound buffer */ | |
| 133 static void DSP_WaitAudio(_THIS) | |
| 134 { | |
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135 /* Not needed at all since OSS handles waiting automagically */ |
| 0 | 136 } |
| 137 | |
| 138 static void DSP_PlayAudio(_THIS) | |
| 139 { | |
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140 if (write(audio_fd, mixbuf, mixlen)==-1) |
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141 { |
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142 perror("Audio write"); |
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143 this->enabled = 0; |
| 0 | 144 } |
| 145 | |
| 146 #ifdef DEBUG_AUDIO | |
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147 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen); |
| 0 | 148 #endif |
| 149 } | |
| 150 | |
| 151 static Uint8 *DSP_GetAudioBuf(_THIS) | |
| 152 { | |
| 153 return(mixbuf); | |
| 154 } | |
| 155 | |
| 156 static void DSP_CloseAudio(_THIS) | |
| 157 { | |
| 158 if ( mixbuf != NULL ) { | |
| 159 SDL_FreeAudioMem(mixbuf); | |
| 160 mixbuf = NULL; | |
| 161 } | |
| 162 if ( audio_fd >= 0 ) { | |
| 163 close(audio_fd); | |
| 164 audio_fd = -1; | |
| 165 } | |
| 166 } | |
| 167 | |
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168 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 0 | 169 { |
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170 char audiodev[1024]; |
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171 int format; |
| 0 | 172 int value; |
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173 int frag_spec; |
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174 Uint16 test_format; |
| 0 | 175 |
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176 /* Open the audio device */ |
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177 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| 0 | 178 if ( audio_fd < 0 ) { |
| 179 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | |
| 180 return(-1); | |
| 181 } | |
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182 mixbuf = NULL; |
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183 |
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184 /* Make the file descriptor use blocking writes with fcntl() */ |
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185 { long flags; |
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186 flags = fcntl(audio_fd, F_GETFL); |
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187 flags &= ~O_NONBLOCK; |
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188 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) { |
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189 SDL_SetError("Couldn't set audio blocking mode"); |
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190 DSP_CloseAudio(this); |
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191 return(-1); |
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192 } |
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193 } |
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194 |
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195 /* Get a list of supported hardware formats */ |
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196 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { |
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197 perror("SNDCTL_DSP_GETFMTS"); |
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198 SDL_SetError("Couldn't get audio format list"); |
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199 DSP_CloseAudio(this); |
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200 return(-1); |
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201 } |
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202 |
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203 /* Try for a closest match on audio format */ |
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204 format = 0; |
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205 for ( test_format = SDL_FirstAudioFormat(spec->format); |
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206 ! format && test_format; ) { |
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207 #ifdef DEBUG_AUDIO |
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208 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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209 #endif |
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210 switch ( test_format ) { |
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211 case AUDIO_U8: |
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212 if ( value & AFMT_U8 ) { |
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213 format = AFMT_U8; |
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214 } |
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215 break; |
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216 case AUDIO_S16LSB: |
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217 if ( value & AFMT_S16_LE ) { |
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218 format = AFMT_S16_LE; |
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219 } |
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220 break; |
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221 case AUDIO_S16MSB: |
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222 if ( value & AFMT_S16_BE ) { |
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223 format = AFMT_S16_BE; |
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224 } |
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225 break; |
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226 #if 0 |
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227 /* |
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228 * These formats are not used by any real life systems so they are not |
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229 * needed here. |
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230 */ |
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231 case AUDIO_S8: |
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232 if ( value & AFMT_S8 ) { |
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233 format = AFMT_S8; |
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234 } |
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235 break; |
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236 case AUDIO_U16LSB: |
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237 if ( value & AFMT_U16_LE ) { |
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238 format = AFMT_U16_LE; |
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239 } |
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240 break; |
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241 case AUDIO_U16MSB: |
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242 if ( value & AFMT_U16_BE ) { |
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243 format = AFMT_U16_BE; |
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244 } |
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245 break; |
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246 #endif |
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247 default: |
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248 format = 0; |
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249 break; |
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250 } |
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251 if ( ! format ) { |
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252 test_format = SDL_NextAudioFormat(); |
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253 } |
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254 } |
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255 if ( format == 0 ) { |
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256 SDL_SetError("Couldn't find any hardware audio formats"); |
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257 DSP_CloseAudio(this); |
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258 return(-1); |
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259 } |
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260 spec->format = test_format; |
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261 |
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262 /* Set the audio format */ |
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263 value = format; |
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264 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || |
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265 (value != format) ) { |
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266 perror("SNDCTL_DSP_SETFMT"); |
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267 SDL_SetError("Couldn't set audio format"); |
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268 DSP_CloseAudio(this); |
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269 return(-1); |
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270 } |
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271 |
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272 /* Set the number of channels of output */ |
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273 value = spec->channels; |
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274 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) { |
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275 perror("SNDCTL_DSP_CHANNELS"); |
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276 SDL_SetError("Cannot set the number of channels"); |
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277 DSP_CloseAudio(this); |
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278 return(-1); |
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279 } |
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280 spec->channels = value; |
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281 |
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282 /* Set the DSP frequency */ |
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283 value = spec->freq; |
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284 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { |
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285 perror("SNDCTL_DSP_SPEED"); |
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286 SDL_SetError("Couldn't set audio frequency"); |
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287 DSP_CloseAudio(this); |
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288 return(-1); |
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289 } |
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290 spec->freq = value; |
| 0 | 291 |
| 292 /* Calculate the final parameters for this audio specification */ | |
| 293 SDL_CalculateAudioSpec(spec); | |
| 294 | |
| 295 /* Determine the power of two of the fragment size */ | |
| 296 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 297 if ( (0x01<<frag_spec) != spec->size ) { | |
| 298 SDL_SetError("Fragment size must be a power of two"); | |
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299 DSP_CloseAudio(this); |
| 0 | 300 return(-1); |
| 301 } | |
| 302 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 303 | |
| 304 /* Set the audio buffering parameters */ | |
| 305 #ifdef DEBUG_AUDIO | |
| 306 fprintf(stderr, "Requesting %d fragments of size %d\n", | |
| 307 (frag_spec >> 16), 1<<(frag_spec&0xFFFF)); | |
| 308 #endif | |
| 309 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { | |
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310 perror("SNDCTL_DSP_SETFRAGMENT"); |
| 0 | 311 fprintf(stderr, "Warning: Couldn't set audio fragment size\n"); |
| 312 } | |
| 313 #ifdef DEBUG_AUDIO | |
| 314 { audio_buf_info info; | |
| 315 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info); | |
| 316 fprintf(stderr, "fragments = %d\n", info.fragments); | |
| 317 fprintf(stderr, "fragstotal = %d\n", info.fragstotal); | |
| 318 fprintf(stderr, "fragsize = %d\n", info.fragsize); | |
| 319 fprintf(stderr, "bytes = %d\n", info.bytes); | |
| 320 } | |
| 321 #endif | |
| 322 | |
| 323 /* Allocate mixing buffer */ | |
| 324 mixlen = spec->size; | |
| 325 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 326 if ( mixbuf == NULL ) { | |
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327 DSP_CloseAudio(this); |
| 0 | 328 return(-1); |
| 329 } | |
| 330 memset(mixbuf, spec->silence, spec->size); | |
| 331 | |
| 332 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 333 parent = getpid(); | |
| 334 | |
| 335 /* We're ready to rock and roll. :-) */ | |
| 336 return(0); | |
| 337 } |