Mercurial > sdl-ios-xcode
annotate src/audio/amigaos/SDL_ahiaudio.c @ 136:717f739d6ec1
Added hardware stretching code to scale 640x480 to TV resolution
There's a bug of some kind in the 16bpp code. ??
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Aug 2001 08:41:45 +0000 |
| parents | 75a95f82bc1f |
| children | e8157fcb3114 |
| 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) | |
| 22 slouken@devolution.com | |
| 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 |
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32 #include <stdio.h> |
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33 #include <stdlib.h> |
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34 #include <string.h> |
| 0 | 35 |
| 36 #include "SDL_endian.h" | |
| 37 #include "SDL_audio.h" | |
| 38 #include "SDL_audiomem.h" | |
| 39 #include "SDL_audio_c.h" | |
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40 #include "SDL_ahiaudio.h" |
| 0 | 41 |
| 42 /* Audio driver functions */ | |
| 43 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 44 static void AHI_WaitAudio(_THIS); | |
| 45 static void AHI_PlayAudio(_THIS); | |
| 46 static Uint8 *AHI_GetAudioBuf(_THIS); | |
| 47 static void AHI_CloseAudio(_THIS); | |
| 48 | |
| 49 #ifndef __SASC | |
| 50 #define mymalloc(x) AllocVec(x,MEMF_PUBLIC) | |
| 51 #define myfree FreeVec | |
| 52 #else | |
| 53 #define mymalloc malloc | |
| 54 #define myfree free | |
| 55 #endif | |
| 56 | |
| 57 /* Audio driver bootstrap functions */ | |
| 58 | |
| 59 static int Audio_Available(void) | |
| 60 { | |
|
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61 int ok=0; |
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62 struct MsgPort *p; |
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63 struct AHIRequest *req; |
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64 |
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65 if(p=CreateMsgPort()) |
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66 { |
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67 if(req=(struct AHIRequest *)CreateIORequest(p,sizeof(struct AHIRequest))) |
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68 { |
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69 req->ahir_Version=4; |
| 0 | 70 |
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71 if(!OpenDevice(AHINAME,0,(struct IORequest *)req,NULL)) |
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72 { |
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73 D(bug("AHI available.\n")); |
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74 ok=1; |
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75 CloseDevice((struct IORequest *)req); |
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76 } |
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77 DeleteIORequest((struct IORequest *)req); |
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78 } |
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79 DeleteMsgPort(p); |
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80 } |
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81 |
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82 D(if(!ok) bug("AHI not available\n")); |
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83 return ok; |
| 0 | 84 } |
| 85 | |
| 86 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 87 { | |
| 88 free(device->hidden); | |
| 89 free(device); | |
| 90 } | |
| 91 | |
| 92 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 93 { | |
| 94 SDL_AudioDevice *this; | |
| 95 | |
| 96 #ifndef NO_AMIGADEBUG | |
| 97 D(bug("AHI created...\n")); | |
| 98 #endif | |
| 99 | |
| 100 /* Initialize all variables that we clean on shutdown */ | |
| 101 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 102 if ( this ) { | |
| 103 memset(this, 0, (sizeof *this)); | |
| 104 this->hidden = (struct SDL_PrivateAudioData *) | |
| 105 malloc((sizeof *this->hidden)); | |
| 106 } | |
| 107 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 108 SDL_OutOfMemory(); | |
| 109 if ( this ) { | |
| 110 free(this); | |
| 111 } | |
| 112 return(0); | |
| 113 } | |
| 114 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 115 | |
| 116 /* Set the function pointers */ | |
| 117 this->OpenAudio = AHI_OpenAudio; | |
| 118 this->WaitAudio = AHI_WaitAudio; | |
| 119 this->PlayAudio = AHI_PlayAudio; | |
| 120 this->GetAudioBuf = AHI_GetAudioBuf; | |
| 121 this->CloseAudio = AHI_CloseAudio; | |
| 122 | |
| 123 this->free = Audio_DeleteDevice; | |
| 124 | |
| 125 return this; | |
| 126 } | |
| 127 | |
| 128 AudioBootStrap AHI_bootstrap = { | |
| 129 "AHI", Audio_Available, Audio_CreateDevice | |
| 130 }; | |
| 131 | |
| 132 | |
| 133 void static AHI_WaitAudio(_THIS) | |
| 134 { | |
| 135 if(!CheckIO((struct IORequest *)audio_req[current_buffer])) | |
| 136 { | |
| 137 WaitIO((struct IORequest *)audio_req[current_buffer]); | |
| 138 // AbortIO((struct IORequest *)audio_req[current_buffer]); | |
| 139 } | |
| 140 } | |
| 141 | |
| 142 static void AHI_PlayAudio(_THIS) | |
| 143 { | |
| 144 if(playing>1) | |
| 145 WaitIO((struct IORequest *)audio_req[current_buffer]); | |
| 146 | |
| 147 /* Write the audio data out */ | |
| 148 audio_req[current_buffer] -> ahir_Std. io_Message.mn_Node.ln_Pri = 60; | |
| 149 audio_req[current_buffer] -> ahir_Std. io_Data = mixbuf[current_buffer]; | |
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150 audio_req[current_buffer] -> ahir_Std. io_Length = this->hidden->size; |
| 0 | 151 audio_req[current_buffer] -> ahir_Std. io_Offset = 0; |
| 152 audio_req[current_buffer] -> ahir_Std . io_Command = CMD_WRITE; | |
| 153 audio_req[current_buffer] -> ahir_Frequency = this->hidden->freq; | |
| 154 audio_req[current_buffer] -> ahir_Volume = 0x10000; | |
| 155 audio_req[current_buffer] -> ahir_Type = this->hidden->type; | |
| 156 audio_req[current_buffer] -> ahir_Position = 0x8000; | |
| 157 audio_req[current_buffer] -> ahir_Link = (playing>0 ? audio_req[current_buffer^1] : NULL); | |
| 158 | |
| 159 SendIO((struct IORequest *)audio_req[current_buffer]); | |
| 160 current_buffer^=1; | |
| 161 | |
| 162 playing++; | |
| 163 } | |
| 164 | |
| 165 static Uint8 *AHI_GetAudioBuf(_THIS) | |
| 166 { | |
| 167 return(mixbuf[current_buffer]); | |
| 168 } | |
| 169 | |
| 170 static void AHI_CloseAudio(_THIS) | |
| 171 { | |
| 172 D(bug("Closing audio...\n")); | |
| 173 | |
| 174 playing=0; | |
| 175 | |
| 176 if(audio_req[0]) | |
| 177 { | |
| 178 if(audio_req[1]) | |
| 179 { | |
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180 D(bug("Break req[1]...\n")); |
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181 |
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182 AbortIO((struct IORequest *)audio_req[1]); |
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183 WaitIO((struct IORequest *)audio_req[1]); |
| 0 | 184 } |
| 185 | |
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186 D(bug("Break req[0]...\n")); |
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187 |
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188 AbortIO((struct IORequest *)audio_req[0]); |
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189 WaitIO((struct IORequest *)audio_req[0]); |
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190 |
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191 if(audio_req[1]) |
| 0 | 192 { |
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193 D(bug("Break AGAIN req[1]...\n")); |
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194 AbortIO((struct IORequest *)audio_req[1]); |
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195 WaitIO((struct IORequest *)audio_req[1]); |
| 0 | 196 } |
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197 // Double abort to be sure to break the dbuffering process. |
| 0 | 198 |
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199 SDL_Delay(200); |
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200 |
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201 D(bug("Reqs breaked, closing device...\n")); |
| 0 | 202 CloseDevice((struct IORequest *)audio_req[0]); |
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203 D(bug("Device closed, freeing memory...\n")); |
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204 myfree(audio_req[1]); |
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205 D(bug("Memory freed, deleting IOReq...\n")); |
| 0 | 206 DeleteIORequest((struct IORequest *)audio_req[0]); |
| 207 audio_req[0]=audio_req[1]=NULL; | |
| 208 } | |
| 209 | |
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210 D(bug("Freeing mixbuf[0]...\n")); |
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211 if ( mixbuf[0] != NULL ) { |
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212 myfree(mixbuf[0]); |
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213 // SDL_FreeAudioMem(mixbuf[0]); |
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214 mixbuf[0] = NULL; |
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215 } |
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216 |
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217 D(bug("Freeing mixbuf[1]...\n")); |
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218 if ( mixbuf[1] != NULL ) { |
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219 myfree(mixbuf[1]); |
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220 // SDL_FreeAudioMem(mixbuf[1]); |
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221 mixbuf[1] = NULL; |
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222 } |
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223 |
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224 D(bug("Freeing audio_port...\n")); |
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225 |
| 0 | 226 if ( audio_port != NULL ) { |
| 227 DeleteMsgPort(audio_port); | |
| 228 audio_port = NULL; | |
| 229 } | |
| 230 D(bug("...done!\n")); | |
| 231 } | |
| 232 | |
| 233 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 234 { | |
| 235 // int width; | |
| 236 | |
| 237 D(bug("AHI opening...\n")); | |
| 238 | |
| 239 /* Determine the audio parameters from the AudioSpec */ | |
| 240 switch ( spec->format & 0xFF ) { | |
| 241 | |
| 242 case 8: { /* Signed 8 bit audio data */ | |
| 243 D(bug("Samples a 8 bit...\n")); | |
| 244 spec->format = AUDIO_S8; | |
| 245 this->hidden->bytespersample=1; | |
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246 if(spec->channels<2) |
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247 this->hidden->type = AHIST_M8S; |
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248 else |
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249 this->hidden->type = AHIST_S8S; |
| 0 | 250 } |
| 251 break; | |
| 252 | |
| 253 case 16: { /* Signed 16 bit audio data */ | |
| 254 D(bug("Samples a 16 bit...\n")); | |
| 255 spec->format = AUDIO_S16MSB; | |
| 256 this->hidden->bytespersample=2; | |
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257 if(spec->channels<2) |
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258 this->hidden->type = AHIST_M16S; |
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259 else |
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260 this->hidden->type = AHIST_S16S; |
| 0 | 261 } |
| 262 break; | |
| 263 | |
| 264 default: { | |
| 265 SDL_SetError("Unsupported audio format"); | |
| 266 return(-1); | |
| 267 } | |
| 268 } | |
| 269 | |
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270 if(spec->channels!=1 && spec->channels!=2) |
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271 { |
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272 D(bug("Wrong channel number!\n")); |
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273 SDL_SetError("Channel number non supported"); |
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274 return -1; |
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275 } |
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276 |
| 0 | 277 D(bug("Before CalculateAudioSpec\n")); |
| 278 /* Update the fragment size as size in bytes */ | |
| 279 SDL_CalculateAudioSpec(spec); | |
| 280 | |
| 281 D(bug("Before CreateMsgPort\n")); | |
| 282 | |
| 283 if(!(audio_port=CreateMsgPort())) | |
| 284 { | |
| 285 SDL_SetError("Unable to create a MsgPort"); | |
| 286 return -1; | |
| 287 } | |
| 288 | |
| 289 D(bug("Before CreateIORequest\n")); | |
| 290 | |
| 291 if(!(audio_req[0]=(struct AHIRequest *)CreateIORequest(audio_port,sizeof(struct AHIRequest)))) | |
| 292 { | |
| 293 SDL_SetError("Unable to create an AHIRequest"); | |
| 294 DeleteMsgPort(audio_port); | |
| 295 return -1; | |
| 296 } | |
| 297 | |
| 298 audio_req[0]->ahir_Version = 4; | |
| 299 | |
| 300 if(OpenDevice(AHINAME,0,(struct IORequest *)audio_req[0],NULL)) | |
| 301 { | |
| 302 SDL_SetError("Unable to open AHI device!\n"); | |
| 303 DeleteIORequest((struct IORequest *)audio_req[0]); | |
| 304 DeleteMsgPort(audio_port); | |
| 305 return -1; | |
| 306 } | |
| 307 | |
| 308 D(bug("AFTER opendevice\n")); | |
| 309 | |
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310 /* Set output frequency and size */ |
| 0 | 311 this->hidden->freq = spec->freq; |
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312 this->hidden->size = spec->size; |
| 0 | 313 |
| 314 D(bug("Before buffer allocation\n")); | |
| 315 | |
| 316 /* Allocate mixing buffer */ | |
| 317 mixbuf[0] = (Uint8 *)mymalloc(spec->size); | |
| 318 mixbuf[1] = (Uint8 *)mymalloc(spec->size); | |
| 319 | |
| 320 D(bug("Before audio_req allocation\n")); | |
| 321 | |
| 322 if(!(audio_req[1]=mymalloc(sizeof(struct AHIRequest)))) | |
| 323 { | |
| 324 SDL_OutOfMemory(); | |
| 325 return(-1); | |
| 326 } | |
| 327 | |
| 328 D(bug("Before audio_req memcpy\n")); | |
| 329 | |
| 330 memcpy(audio_req[1],audio_req[0],sizeof(struct AHIRequest)); | |
| 331 | |
| 332 if ( mixbuf[0] == NULL || mixbuf[1] == NULL ) { | |
| 333 SDL_OutOfMemory(); | |
| 334 return(-1); | |
| 335 } | |
| 336 | |
| 337 D(bug("Before mixbuf memset\n")); | |
| 338 | |
| 339 memset(mixbuf[0], spec->silence, spec->size); | |
| 340 memset(mixbuf[1], spec->silence, spec->size); | |
| 341 | |
| 342 current_buffer=0; | |
| 343 playing=0; | |
| 344 | |
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345 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 | 346 |
| 347 /* We're ready to rock and roll. :-) */ | |
| 348 return(0); | |
| 349 } |