Mercurial > sdl-ios-xcode
annotate src/audio/amigaos/SDL_ahiaudio.c @ 1147:b580f7201543
From: "Alex Volkov" <avcp-sdlmail@usa.net>
To: "'A list for developers using the SDL library. \(includesSDL-announce\)'" <sdl@libsdl.org>
Date: Mon, 19 Sep 2005 18:59:43 -0400
Subject: [SDL] [patch] Volume multiplier bug in
The volume multiplier in SDL_MixAudio_MMX_S8() is formed from the wrong
register.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 27 Sep 2005 12:14:17 +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 } |