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annotate src/audio/dsp/SDL_dspaudio.c @ 1329:bc67bbf87818
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 04 Feb 2006 22:01:44 +0000 |
| parents | c9b51268668f |
| children | 3692456e7b0f |
| 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 | |
| 28 #include <stdlib.h> | |
| 29 #include <stdio.h> | |
| 30 #include <string.h> | |
| 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 #ifdef OSS_USE_SOUNDCARD_H |
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39 /* This is installed on some systems */ |
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40 #include <soundcard.h> |
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41 #else |
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42 /* This is recommended by OSS */ |
| 0 | 43 #include <sys/soundcard.h> |
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44 #endif |
| 0 | 45 |
| 46 #include "SDL_audio.h" | |
| 47 #include "SDL_error.h" | |
| 48 #include "SDL_audiomem.h" | |
| 49 #include "SDL_audio_c.h" | |
| 50 #include "SDL_timer.h" | |
| 51 #include "SDL_audiodev_c.h" | |
| 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 { | |
| 85 free(device->hidden); | |
| 86 free(device); | |
| 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 */ | |
| 94 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 95 if ( this ) { | |
| 96 memset(this, 0, (sizeof *this)); | |
| 97 this->hidden = (struct SDL_PrivateAudioData *) | |
| 98 malloc((sizeof *this->hidden)); | |
| 99 } | |
| 100 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 101 SDL_OutOfMemory(); | |
| 102 if ( this ) { | |
| 103 free(this); | |
| 104 } | |
| 105 return(0); | |
| 106 } | |
| 107 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 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 /* Open the audio device */ |
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172 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| 0 | 173 if ( audio_fd < 0 ) { |
| 174 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | |
| 175 return(-1); | |
| 176 } | |
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177 mixbuf = NULL; |
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178 |
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179 /* Make the file descriptor use blocking writes with fcntl() */ |
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180 { long flags; |
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181 flags = fcntl(audio_fd, F_GETFL); |
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182 flags &= ~O_NONBLOCK; |
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183 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) { |
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184 SDL_SetError("Couldn't set audio blocking mode"); |
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185 DSP_CloseAudio(this); |
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186 return(-1); |
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187 } |
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188 } |
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189 |
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190 /* Get a list of supported hardware formats */ |
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191 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { |
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192 perror("SNDCTL_DSP_GETFMTS"); |
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193 SDL_SetError("Couldn't get audio format list"); |
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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 /* Try for a closest match on audio format */ |
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199 format = 0; |
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200 for ( test_format = SDL_FirstAudioFormat(spec->format); |
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201 ! format && test_format; ) { |
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202 #ifdef DEBUG_AUDIO |
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203 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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204 #endif |
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205 switch ( test_format ) { |
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206 case AUDIO_U8: |
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207 if ( value & AFMT_U8 ) { |
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208 format = AFMT_U8; |
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209 } |
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210 break; |
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211 case AUDIO_S16LSB: |
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212 if ( value & AFMT_S16_LE ) { |
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213 format = AFMT_S16_LE; |
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214 } |
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215 break; |
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216 case AUDIO_S16MSB: |
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217 if ( value & AFMT_S16_BE ) { |
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218 format = AFMT_S16_BE; |
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219 } |
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220 break; |
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221 #if 0 |
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222 /* |
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223 * These formats are not used by any real life systems so they are not |
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224 * needed here. |
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225 */ |
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226 case AUDIO_S8: |
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227 if ( value & AFMT_S8 ) { |
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228 format = AFMT_S8; |
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229 } |
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230 break; |
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231 case AUDIO_U16LSB: |
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232 if ( value & AFMT_U16_LE ) { |
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233 format = AFMT_U16_LE; |
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234 } |
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235 break; |
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236 case AUDIO_U16MSB: |
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237 if ( value & AFMT_U16_BE ) { |
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238 format = AFMT_U16_BE; |
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239 } |
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240 break; |
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241 #endif |
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242 default: |
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243 format = 0; |
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244 break; |
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245 } |
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246 if ( ! format ) { |
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247 test_format = SDL_NextAudioFormat(); |
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248 } |
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249 } |
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250 if ( format == 0 ) { |
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251 SDL_SetError("Couldn't find any hardware audio formats"); |
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252 DSP_CloseAudio(this); |
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253 return(-1); |
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254 } |
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255 spec->format = test_format; |
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256 |
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257 /* Set the audio format */ |
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258 value = format; |
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259 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || |
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260 (value != format) ) { |
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261 perror("SNDCTL_DSP_SETFMT"); |
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262 SDL_SetError("Couldn't set audio format"); |
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263 DSP_CloseAudio(this); |
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264 return(-1); |
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265 } |
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266 |
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267 /* Set the number of channels of output */ |
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268 value = spec->channels; |
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269 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) { |
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270 perror("SNDCTL_DSP_CHANNELS"); |
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271 SDL_SetError("Cannot set the number of channels"); |
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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 spec->channels = value; |
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276 |
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277 /* Set the DSP frequency */ |
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278 value = spec->freq; |
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279 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { |
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280 perror("SNDCTL_DSP_SPEED"); |
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281 SDL_SetError("Couldn't set audio frequency"); |
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282 DSP_CloseAudio(this); |
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283 return(-1); |
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284 } |
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285 spec->freq = value; |
| 0 | 286 |
| 287 /* Calculate the final parameters for this audio specification */ | |
| 288 SDL_CalculateAudioSpec(spec); | |
| 289 | |
| 290 /* Determine the power of two of the fragment size */ | |
| 291 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 292 if ( (0x01<<frag_spec) != spec->size ) { | |
| 293 SDL_SetError("Fragment size must be a power of two"); | |
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294 DSP_CloseAudio(this); |
| 0 | 295 return(-1); |
| 296 } | |
| 297 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 298 | |
| 299 /* Set the audio buffering parameters */ | |
| 300 #ifdef DEBUG_AUDIO | |
| 301 fprintf(stderr, "Requesting %d fragments of size %d\n", | |
| 302 (frag_spec >> 16), 1<<(frag_spec&0xFFFF)); | |
| 303 #endif | |
| 304 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { | |
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305 perror("SNDCTL_DSP_SETFRAGMENT"); |
| 0 | 306 fprintf(stderr, "Warning: Couldn't set audio fragment size\n"); |
| 307 } | |
| 308 #ifdef DEBUG_AUDIO | |
| 309 { audio_buf_info info; | |
| 310 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info); | |
| 311 fprintf(stderr, "fragments = %d\n", info.fragments); | |
| 312 fprintf(stderr, "fragstotal = %d\n", info.fragstotal); | |
| 313 fprintf(stderr, "fragsize = %d\n", info.fragsize); | |
| 314 fprintf(stderr, "bytes = %d\n", info.bytes); | |
| 315 } | |
| 316 #endif | |
| 317 | |
| 318 /* Allocate mixing buffer */ | |
| 319 mixlen = spec->size; | |
| 320 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 321 if ( mixbuf == NULL ) { | |
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322 DSP_CloseAudio(this); |
| 0 | 323 return(-1); |
| 324 } | |
| 325 memset(mixbuf, spec->silence, spec->size); | |
| 326 | |
| 327 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 328 parent = getpid(); | |
| 329 | |
| 330 /* We're ready to rock and roll. :-) */ | |
| 331 return(0); | |
| 332 } |