Mercurial > sdl-ios-xcode
annotate src/audio/amigaos/SDL_ahiaudio.c @ 1199:2d6dc7de1145
From: Mike Frysinger <vapier@gentoo.org>
To: sdl@libsdl.org
Date: Sun, 11 Dec 2005 22:57:37 -0500
Subject: [SDL] exec stack in libsdl update
i posted back in September a patch to remove executable stacks:
http://www.devolution.com/pipermail/sdl/2005-September/070626.html
later in November, a similar patch was merged it seems:
http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm
however, this lacks the additional output format checks that i posted in my
patch ... this isnt a problem if the hermes asm code is only ever used to
produce ELF objects, but if this is not true, then the additional checks in
my original patch will need to be merged
-mike
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 12 Dec 2005 09:13:12 +0000 |
| parents | dcb5e869f8b5 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998 Sam Lantinga | |
| 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 | |
| 20 5635-34 Springhouse Dr. | |
| 21 Pleasanton, CA 94588 (USA) | |
|
252
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22 slouken@libsdl.org |
| 0 | 23 */ |
| 24 | |
| 25 #ifdef SAVE_RCSID | |
| 26 static char rcsid = | |
| 27 "@(#) $Id$"; | |
| 28 #endif | |
| 29 | |
|
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30 /* Allow access to a raw mixing buffer (for AmigaOS) */ |
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31 |
| 0 | 32 #include "SDL_endian.h" |
| 33 #include "SDL_audio.h" | |
| 34 #include "SDL_audiomem.h" | |
| 35 #include "SDL_audio_c.h" | |
|
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36 #include "SDL_ahiaudio.h" |
| 0 | 37 |
| 38 /* Audio driver functions */ | |
| 39 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 40 static void AHI_WaitAudio(_THIS); | |
| 41 static void AHI_PlayAudio(_THIS); | |
| 42 static Uint8 *AHI_GetAudioBuf(_THIS); | |
| 43 static void AHI_CloseAudio(_THIS); | |
| 44 | |
| 45 #ifndef __SASC | |
| 46 #define mymalloc(x) AllocVec(x,MEMF_PUBLIC) | |
| 47 #define myfree FreeVec | |
| 48 #else | |
| 49 #define mymalloc malloc | |
| 50 #define myfree free | |
| 51 #endif | |
| 52 | |
| 53 /* Audio driver bootstrap functions */ | |
| 54 | |
| 55 static int Audio_Available(void) | |
| 56 { | |
|
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57 int ok=0; |
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58 struct MsgPort *p; |
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59 struct AHIRequest *req; |
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60 |
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61 if(p=CreateMsgPort()) |
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62 { |
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63 if(req=(struct AHIRequest *)CreateIORequest(p,sizeof(struct AHIRequest))) |
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64 { |
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65 req->ahir_Version=4; |
| 0 | 66 |
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67 if(!OpenDevice(AHINAME,0,(struct IORequest *)req,NULL)) |
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68 { |
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69 D(bug("AHI available.\n")); |
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70 ok=1; |
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71 CloseDevice((struct IORequest *)req); |
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72 } |
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73 DeleteIORequest((struct IORequest *)req); |
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74 } |
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75 DeleteMsgPort(p); |
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76 } |
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77 |
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78 D(if(!ok) bug("AHI not available\n")); |
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79 return ok; |
| 0 | 80 } |
| 81 | |
| 82 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 83 { | |
| 84 free(device->hidden); | |
| 85 free(device); | |
| 86 } | |
| 87 | |
| 88 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 89 { | |
| 90 SDL_AudioDevice *this; | |
| 91 | |
| 92 #ifndef NO_AMIGADEBUG | |
| 93 D(bug("AHI created...\n")); | |
| 94 #endif | |
| 95 | |
| 96 /* Initialize all variables that we clean on shutdown */ | |
| 97 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 98 if ( this ) { | |
| 99 memset(this, 0, (sizeof *this)); | |
| 100 this->hidden = (struct SDL_PrivateAudioData *) | |
| 101 malloc((sizeof *this->hidden)); | |
| 102 } | |
| 103 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 104 SDL_OutOfMemory(); | |
| 105 if ( this ) { | |
| 106 free(this); | |
| 107 } | |
| 108 return(0); | |
| 109 } | |
| 110 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 111 | |
| 112 /* Set the function pointers */ | |
| 113 this->OpenAudio = AHI_OpenAudio; | |
| 114 this->WaitAudio = AHI_WaitAudio; | |
| 115 this->PlayAudio = AHI_PlayAudio; | |
| 116 this->GetAudioBuf = AHI_GetAudioBuf; | |
| 117 this->CloseAudio = AHI_CloseAudio; | |
| 118 | |
| 119 this->free = Audio_DeleteDevice; | |
| 120 | |
| 121 return this; | |
| 122 } | |
| 123 | |
| 124 AudioBootStrap AHI_bootstrap = { | |
| 125 "AHI", Audio_Available, Audio_CreateDevice | |
| 126 }; | |
| 127 | |
| 128 | |
| 129 void static AHI_WaitAudio(_THIS) | |
| 130 { | |
| 131 if(!CheckIO((struct IORequest *)audio_req[current_buffer])) | |
| 132 { | |
| 133 WaitIO((struct IORequest *)audio_req[current_buffer]); | |
| 134 // AbortIO((struct IORequest *)audio_req[current_buffer]); | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 static void AHI_PlayAudio(_THIS) | |
| 139 { | |
| 140 if(playing>1) | |
| 141 WaitIO((struct IORequest *)audio_req[current_buffer]); | |
| 142 | |
| 143 /* Write the audio data out */ | |
| 144 audio_req[current_buffer] -> ahir_Std. io_Message.mn_Node.ln_Pri = 60; | |
| 145 audio_req[current_buffer] -> ahir_Std. io_Data = mixbuf[current_buffer]; | |
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146 audio_req[current_buffer] -> ahir_Std. io_Length = this->hidden->size; |
| 0 | 147 audio_req[current_buffer] -> ahir_Std. io_Offset = 0; |
| 148 audio_req[current_buffer] -> ahir_Std . io_Command = CMD_WRITE; | |
| 149 audio_req[current_buffer] -> ahir_Frequency = this->hidden->freq; | |
| 150 audio_req[current_buffer] -> ahir_Volume = 0x10000; | |
| 151 audio_req[current_buffer] -> ahir_Type = this->hidden->type; | |
| 152 audio_req[current_buffer] -> ahir_Position = 0x8000; | |
| 153 audio_req[current_buffer] -> ahir_Link = (playing>0 ? audio_req[current_buffer^1] : NULL); | |
| 154 | |
| 155 SendIO((struct IORequest *)audio_req[current_buffer]); | |
| 156 current_buffer^=1; | |
| 157 | |
| 158 playing++; | |
| 159 } | |
| 160 | |
| 161 static Uint8 *AHI_GetAudioBuf(_THIS) | |
| 162 { | |
| 163 return(mixbuf[current_buffer]); | |
| 164 } | |
| 165 | |
| 166 static void AHI_CloseAudio(_THIS) | |
| 167 { | |
| 168 D(bug("Closing audio...\n")); | |
| 169 | |
| 170 playing=0; | |
| 171 | |
| 172 if(audio_req[0]) | |
| 173 { | |
| 174 if(audio_req[1]) | |
| 175 { | |
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176 D(bug("Break req[1]...\n")); |
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177 |
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178 AbortIO((struct IORequest *)audio_req[1]); |
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179 WaitIO((struct IORequest *)audio_req[1]); |
| 0 | 180 } |
| 181 | |
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182 D(bug("Break req[0]...\n")); |
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183 |
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184 AbortIO((struct IORequest *)audio_req[0]); |
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185 WaitIO((struct IORequest *)audio_req[0]); |
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186 |
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187 if(audio_req[1]) |
| 0 | 188 { |
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189 D(bug("Break AGAIN req[1]...\n")); |
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190 AbortIO((struct IORequest *)audio_req[1]); |
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191 WaitIO((struct IORequest *)audio_req[1]); |
| 0 | 192 } |
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193 // Double abort to be sure to break the dbuffering process. |
| 0 | 194 |
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195 SDL_Delay(200); |
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196 |
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197 D(bug("Reqs breaked, closing device...\n")); |
| 0 | 198 CloseDevice((struct IORequest *)audio_req[0]); |
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199 D(bug("Device closed, freeing memory...\n")); |
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200 myfree(audio_req[1]); |
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201 D(bug("Memory freed, deleting IOReq...\n")); |
| 0 | 202 DeleteIORequest((struct IORequest *)audio_req[0]); |
| 203 audio_req[0]=audio_req[1]=NULL; | |
| 204 } | |
| 205 | |
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206 D(bug("Freeing mixbuf[0]...\n")); |
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207 if ( mixbuf[0] != NULL ) { |
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208 myfree(mixbuf[0]); |
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209 // SDL_FreeAudioMem(mixbuf[0]); |
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210 mixbuf[0] = NULL; |
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211 } |
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212 |
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213 D(bug("Freeing mixbuf[1]...\n")); |
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214 if ( mixbuf[1] != NULL ) { |
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215 myfree(mixbuf[1]); |
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216 // SDL_FreeAudioMem(mixbuf[1]); |
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217 mixbuf[1] = NULL; |
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218 } |
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219 |
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220 D(bug("Freeing audio_port...\n")); |
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221 |
| 0 | 222 if ( audio_port != NULL ) { |
| 223 DeleteMsgPort(audio_port); | |
| 224 audio_port = NULL; | |
| 225 } | |
| 226 D(bug("...done!\n")); | |
| 227 } | |
| 228 | |
| 229 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 230 { | |
| 231 // int width; | |
| 232 | |
| 233 D(bug("AHI opening...\n")); | |
| 234 | |
| 235 /* Determine the audio parameters from the AudioSpec */ | |
| 236 switch ( spec->format & 0xFF ) { | |
| 237 | |
| 238 case 8: { /* Signed 8 bit audio data */ | |
| 239 D(bug("Samples a 8 bit...\n")); | |
| 240 spec->format = AUDIO_S8; | |
| 241 this->hidden->bytespersample=1; | |
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242 if(spec->channels<2) |
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243 this->hidden->type = AHIST_M8S; |
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244 else |
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245 this->hidden->type = AHIST_S8S; |
| 0 | 246 } |
| 247 break; | |
| 248 | |
| 249 case 16: { /* Signed 16 bit audio data */ | |
| 250 D(bug("Samples a 16 bit...\n")); | |
| 251 spec->format = AUDIO_S16MSB; | |
| 252 this->hidden->bytespersample=2; | |
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253 if(spec->channels<2) |
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254 this->hidden->type = AHIST_M16S; |
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255 else |
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256 this->hidden->type = AHIST_S16S; |
| 0 | 257 } |
| 258 break; | |
| 259 | |
| 260 default: { | |
| 261 SDL_SetError("Unsupported audio format"); | |
| 262 return(-1); | |
| 263 } | |
| 264 } | |
| 265 | |
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266 if(spec->channels!=1 && spec->channels!=2) |
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267 { |
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268 D(bug("Wrong channel number!\n")); |
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269 SDL_SetError("Channel number non supported"); |
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270 return -1; |
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271 } |
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272 |
| 0 | 273 D(bug("Before CalculateAudioSpec\n")); |
| 274 /* Update the fragment size as size in bytes */ | |
| 275 SDL_CalculateAudioSpec(spec); | |
| 276 | |
| 277 D(bug("Before CreateMsgPort\n")); | |
| 278 | |
| 279 if(!(audio_port=CreateMsgPort())) | |
| 280 { | |
| 281 SDL_SetError("Unable to create a MsgPort"); | |
| 282 return -1; | |
| 283 } | |
| 284 | |
| 285 D(bug("Before CreateIORequest\n")); | |
| 286 | |
| 287 if(!(audio_req[0]=(struct AHIRequest *)CreateIORequest(audio_port,sizeof(struct AHIRequest)))) | |
| 288 { | |
| 289 SDL_SetError("Unable to create an AHIRequest"); | |
| 290 DeleteMsgPort(audio_port); | |
| 291 return -1; | |
| 292 } | |
| 293 | |
| 294 audio_req[0]->ahir_Version = 4; | |
| 295 | |
| 296 if(OpenDevice(AHINAME,0,(struct IORequest *)audio_req[0],NULL)) | |
| 297 { | |
| 298 SDL_SetError("Unable to open AHI device!\n"); | |
| 299 DeleteIORequest((struct IORequest *)audio_req[0]); | |
| 300 DeleteMsgPort(audio_port); | |
| 301 return -1; | |
| 302 } | |
| 303 | |
| 304 D(bug("AFTER opendevice\n")); | |
| 305 | |
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306 /* Set output frequency and size */ |
| 0 | 307 this->hidden->freq = spec->freq; |
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308 this->hidden->size = spec->size; |
| 0 | 309 |
| 310 D(bug("Before buffer allocation\n")); | |
| 311 | |
| 312 /* Allocate mixing buffer */ | |
| 313 mixbuf[0] = (Uint8 *)mymalloc(spec->size); | |
| 314 mixbuf[1] = (Uint8 *)mymalloc(spec->size); | |
| 315 | |
| 316 D(bug("Before audio_req allocation\n")); | |
| 317 | |
| 318 if(!(audio_req[1]=mymalloc(sizeof(struct AHIRequest)))) | |
| 319 { | |
| 320 SDL_OutOfMemory(); | |
| 321 return(-1); | |
| 322 } | |
| 323 | |
| 324 D(bug("Before audio_req memcpy\n")); | |
| 325 | |
| 326 memcpy(audio_req[1],audio_req[0],sizeof(struct AHIRequest)); | |
| 327 | |
| 328 if ( mixbuf[0] == NULL || mixbuf[1] == NULL ) { | |
| 329 SDL_OutOfMemory(); | |
| 330 return(-1); | |
| 331 } | |
| 332 | |
| 333 D(bug("Before mixbuf memset\n")); | |
| 334 | |
| 335 memset(mixbuf[0], spec->silence, spec->size); | |
| 336 memset(mixbuf[1], spec->silence, spec->size); | |
| 337 | |
| 338 current_buffer=0; | |
| 339 playing=0; | |
| 340 | |
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341 D(bug("AHI opened: freq:%ld mixbuf:%lx/%lx buflen:%ld bits:%ld channels:%ld\n",spec->freq,mixbuf[0],mixbuf[1],spec->size,this->hidden->bytespersample*8,spec->channels)); |
| 0 | 342 |
| 343 /* We're ready to rock and roll. :-) */ | |
| 344 return(0); | |
| 345 } |