Mercurial > sdl-ios-xcode
annotate src/audio/dsp/SDL_dspaudio.c @ 1643:51038e80ae59
More general fix for bug #189
The clipping is done at a higher level, and the low level functions are
passed clipped rectangles. Drivers which don't support source clipping
have not been changed, so the image will be squished instead of clipped,
but at least they will no longer crash when the destination rect was out
of bounds.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 17 Apr 2006 06:47:23 +0000 |
| parents | 97d0966f4bf7 |
| children | 782fd950bd46 c121d94672cb aeb55f698ee3 |
| 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 /* 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 */ | |
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291 for ( frag_spec = 0; (0x01U<<frag_spec) < spec->size; ++frag_spec ); |
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292 if ( (0x01U<<frag_spec) != spec->size ) { |
| 0 | 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 } |
| 307 #ifdef DEBUG_AUDIO | |
| 308 { audio_buf_info info; | |
| 309 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info); | |
| 310 fprintf(stderr, "fragments = %d\n", info.fragments); | |
| 311 fprintf(stderr, "fragstotal = %d\n", info.fragstotal); | |
| 312 fprintf(stderr, "fragsize = %d\n", info.fragsize); | |
| 313 fprintf(stderr, "bytes = %d\n", info.bytes); | |
| 314 } | |
| 315 #endif | |
| 316 | |
| 317 /* Allocate mixing buffer */ | |
| 318 mixlen = spec->size; | |
| 319 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 320 if ( mixbuf == NULL ) { | |
|
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321 DSP_CloseAudio(this); |
| 0 | 322 return(-1); |
| 323 } | |
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324 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 325 |
| 326 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 327 parent = getpid(); | |
| 328 | |
| 329 /* We're ready to rock and roll. :-) */ | |
| 330 return(0); | |
| 331 } |