Mercurial > sdl-ios-xcode
annotate src/audio/dsp/SDL_dspaudio.c @ 1358:c71e05b4dc2e
More header massaging... works great on Windows. ;-)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 06:48:43 +0000 |
| parents | d02b552e5304 |
| children | 19418e4422cb |
| 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 */ |
| 25 | |
| 26 /* Allow access to a raw mixing buffer */ | |
| 27 | |
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28 #include <stdio.h> /* For perror() */ |
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29 #include <string.h> /* For strerror() */ |
| 0 | 30 #include <errno.h> |
| 31 #include <unistd.h> | |
| 32 #include <fcntl.h> | |
| 33 #include <signal.h> | |
| 34 #include <sys/time.h> | |
| 35 #include <sys/ioctl.h> | |
| 36 #include <sys/stat.h> | |
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37 #ifdef OSS_USE_SOUNDCARD_H |
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38 /* This is installed on some systems */ |
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39 #include <soundcard.h> |
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40 #else |
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41 /* This is recommended by OSS */ |
| 0 | 42 #include <sys/soundcard.h> |
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43 #endif |
| 0 | 44 |
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45 #include "SDL_timer.h" |
| 0 | 46 #include "SDL_audio.h" |
| 47 #include "SDL_audiomem.h" | |
| 48 #include "SDL_audio_c.h" | |
| 49 #include "SDL_audiodev_c.h" | |
| 50 #include "SDL_dspaudio.h" | |
| 51 | |
| 52 /* The tag name used by DSP audio */ | |
| 53 #define DSP_DRIVER_NAME "dsp" | |
| 54 | |
| 55 /* Open the audio device for playback, and don't block if busy */ | |
| 56 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) | |
| 57 | |
| 58 /* Audio driver functions */ | |
| 59 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 60 static void DSP_WaitAudio(_THIS); | |
| 61 static void DSP_PlayAudio(_THIS); | |
| 62 static Uint8 *DSP_GetAudioBuf(_THIS); | |
| 63 static void DSP_CloseAudio(_THIS); | |
| 64 | |
| 65 /* Audio driver bootstrap functions */ | |
| 66 | |
| 67 static int Audio_Available(void) | |
| 68 { | |
| 69 int fd; | |
| 70 int available; | |
| 71 | |
| 72 available = 0; | |
| 73 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); | |
| 74 if ( fd >= 0 ) { | |
| 75 available = 1; | |
| 76 close(fd); | |
| 77 } | |
| 78 return(available); | |
| 79 } | |
| 80 | |
| 81 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 82 { | |
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83 SDL_free(device->hidden); |
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84 SDL_free(device); |
| 0 | 85 } |
| 86 | |
| 87 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 88 { | |
| 89 SDL_AudioDevice *this; | |
| 90 | |
| 91 /* Initialize all variables that we clean on shutdown */ | |
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92 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 93 if ( this ) { |
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94 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 95 this->hidden = (struct SDL_PrivateAudioData *) |
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96 SDL_malloc((sizeof *this->hidden)); |
| 0 | 97 } |
| 98 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 99 SDL_OutOfMemory(); | |
| 100 if ( this ) { | |
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101 SDL_free(this); |
| 0 | 102 } |
| 103 return(0); | |
| 104 } | |
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105 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 106 audio_fd = -1; |
| 107 | |
| 108 /* Set the function pointers */ | |
| 109 this->OpenAudio = DSP_OpenAudio; | |
| 110 this->WaitAudio = DSP_WaitAudio; | |
| 111 this->PlayAudio = DSP_PlayAudio; | |
| 112 this->GetAudioBuf = DSP_GetAudioBuf; | |
| 113 this->CloseAudio = DSP_CloseAudio; | |
| 114 | |
| 115 this->free = Audio_DeleteDevice; | |
| 116 | |
| 117 return this; | |
| 118 } | |
| 119 | |
| 120 AudioBootStrap DSP_bootstrap = { | |
| 121 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio", | |
| 122 Audio_Available, Audio_CreateDevice | |
| 123 }; | |
| 124 | |
| 125 /* This function waits until it is possible to write a full sound buffer */ | |
| 126 static void DSP_WaitAudio(_THIS) | |
| 127 { | |
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128 /* Not needed at all since OSS handles waiting automagically */ |
| 0 | 129 } |
| 130 | |
| 131 static void DSP_PlayAudio(_THIS) | |
| 132 { | |
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133 if (write(audio_fd, mixbuf, mixlen)==-1) |
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134 { |
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135 perror("Audio write"); |
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136 this->enabled = 0; |
| 0 | 137 } |
| 138 | |
| 139 #ifdef DEBUG_AUDIO | |
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140 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen); |
| 0 | 141 #endif |
| 142 } | |
| 143 | |
| 144 static Uint8 *DSP_GetAudioBuf(_THIS) | |
| 145 { | |
| 146 return(mixbuf); | |
| 147 } | |
| 148 | |
| 149 static void DSP_CloseAudio(_THIS) | |
| 150 { | |
| 151 if ( mixbuf != NULL ) { | |
| 152 SDL_FreeAudioMem(mixbuf); | |
| 153 mixbuf = NULL; | |
| 154 } | |
| 155 if ( audio_fd >= 0 ) { | |
| 156 close(audio_fd); | |
| 157 audio_fd = -1; | |
| 158 } | |
| 159 } | |
| 160 | |
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161 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 0 | 162 { |
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163 char audiodev[1024]; |
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164 int format; |
| 0 | 165 int value; |
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166 int frag_spec; |
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167 Uint16 test_format; |
| 0 | 168 |
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169 /* Open the audio device */ |
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170 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| 0 | 171 if ( audio_fd < 0 ) { |
| 172 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | |
| 173 return(-1); | |
| 174 } | |
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175 mixbuf = NULL; |
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176 |
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177 /* Make the file descriptor use blocking writes with fcntl() */ |
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178 { long flags; |
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179 flags = fcntl(audio_fd, F_GETFL); |
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180 flags &= ~O_NONBLOCK; |
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181 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) { |
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182 SDL_SetError("Couldn't set audio blocking mode"); |
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183 DSP_CloseAudio(this); |
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184 return(-1); |
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185 } |
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186 } |
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187 |
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188 /* Get a list of supported hardware formats */ |
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189 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { |
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190 perror("SNDCTL_DSP_GETFMTS"); |
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191 SDL_SetError("Couldn't get audio format list"); |
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192 DSP_CloseAudio(this); |
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193 return(-1); |
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194 } |
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195 |
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196 /* Try for a closest match on audio format */ |
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197 format = 0; |
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198 for ( test_format = SDL_FirstAudioFormat(spec->format); |
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199 ! format && test_format; ) { |
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200 #ifdef DEBUG_AUDIO |
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201 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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202 #endif |
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203 switch ( test_format ) { |
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204 case AUDIO_U8: |
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205 if ( value & AFMT_U8 ) { |
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206 format = AFMT_U8; |
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207 } |
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208 break; |
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209 case AUDIO_S16LSB: |
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210 if ( value & AFMT_S16_LE ) { |
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211 format = AFMT_S16_LE; |
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212 } |
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213 break; |
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214 case AUDIO_S16MSB: |
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215 if ( value & AFMT_S16_BE ) { |
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216 format = AFMT_S16_BE; |
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217 } |
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218 break; |
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219 #if 0 |
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220 /* |
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221 * These formats are not used by any real life systems so they are not |
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222 * needed here. |
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223 */ |
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224 case AUDIO_S8: |
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225 if ( value & AFMT_S8 ) { |
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226 format = AFMT_S8; |
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227 } |
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228 break; |
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229 case AUDIO_U16LSB: |
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230 if ( value & AFMT_U16_LE ) { |
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231 format = AFMT_U16_LE; |
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232 } |
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233 break; |
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234 case AUDIO_U16MSB: |
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235 if ( value & AFMT_U16_BE ) { |
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236 format = AFMT_U16_BE; |
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237 } |
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238 break; |
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239 #endif |
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240 default: |
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241 format = 0; |
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242 break; |
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243 } |
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244 if ( ! format ) { |
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245 test_format = SDL_NextAudioFormat(); |
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246 } |
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247 } |
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248 if ( format == 0 ) { |
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249 SDL_SetError("Couldn't find any hardware audio formats"); |
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250 DSP_CloseAudio(this); |
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251 return(-1); |
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252 } |
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253 spec->format = test_format; |
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254 |
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255 /* Set the audio format */ |
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256 value = format; |
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257 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || |
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258 (value != format) ) { |
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259 perror("SNDCTL_DSP_SETFMT"); |
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260 SDL_SetError("Couldn't set audio format"); |
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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 |
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265 /* Set the number of channels of output */ |
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266 value = spec->channels; |
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267 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) { |
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268 perror("SNDCTL_DSP_CHANNELS"); |
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269 SDL_SetError("Cannot set the number of channels"); |
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270 DSP_CloseAudio(this); |
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271 return(-1); |
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272 } |
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273 spec->channels = value; |
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274 |
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275 /* Set the DSP frequency */ |
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276 value = spec->freq; |
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277 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { |
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278 perror("SNDCTL_DSP_SPEED"); |
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279 SDL_SetError("Couldn't set audio frequency"); |
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280 DSP_CloseAudio(this); |
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281 return(-1); |
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282 } |
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283 spec->freq = value; |
| 0 | 284 |
| 285 /* Calculate the final parameters for this audio specification */ | |
| 286 SDL_CalculateAudioSpec(spec); | |
| 287 | |
| 288 /* Determine the power of two of the fragment size */ | |
| 289 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 290 if ( (0x01<<frag_spec) != spec->size ) { | |
| 291 SDL_SetError("Fragment size must be a power of two"); | |
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292 DSP_CloseAudio(this); |
| 0 | 293 return(-1); |
| 294 } | |
| 295 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 296 | |
| 297 /* Set the audio buffering parameters */ | |
| 298 #ifdef DEBUG_AUDIO | |
| 299 fprintf(stderr, "Requesting %d fragments of size %d\n", | |
| 300 (frag_spec >> 16), 1<<(frag_spec&0xFFFF)); | |
| 301 #endif | |
| 302 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { | |
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303 perror("SNDCTL_DSP_SETFRAGMENT"); |
| 0 | 304 } |
| 305 #ifdef DEBUG_AUDIO | |
| 306 { audio_buf_info info; | |
| 307 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info); | |
| 308 fprintf(stderr, "fragments = %d\n", info.fragments); | |
| 309 fprintf(stderr, "fragstotal = %d\n", info.fragstotal); | |
| 310 fprintf(stderr, "fragsize = %d\n", info.fragsize); | |
| 311 fprintf(stderr, "bytes = %d\n", info.bytes); | |
| 312 } | |
| 313 #endif | |
| 314 | |
| 315 /* Allocate mixing buffer */ | |
| 316 mixlen = spec->size; | |
| 317 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 318 if ( mixbuf == NULL ) { | |
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319 DSP_CloseAudio(this); |
| 0 | 320 return(-1); |
| 321 } | |
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322 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 323 |
| 324 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 325 parent = getpid(); | |
| 326 | |
| 327 /* We're ready to rock and roll. :-) */ | |
| 328 return(0); | |
| 329 } |