Mercurial > sdl-ios-xcode
annotate src/audio/amigaos/SDL_ahiaudio.c @ 3851:405a192b68e7 SDL-1.2
Backport from 1.3: most of the audio drivers can now handle data
conversion at a higher level when they can't open the hardware in the
exact format requested.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 01 Sep 2006 22:50:24 +0000 |
| parents | d910939febfa |
| children | 5b5e549382b3 |
| 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 |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
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24 /* Allow access to a raw mixing buffer (for AmigaOS) */ |
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25 |
| 0 | 26 #include "SDL_audio.h" |
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27 #include "../SDL_audio_c.h" |
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28 #include "SDL_ahiaudio.h" |
| 0 | 29 |
| 30 /* Audio driver functions */ | |
| 31 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 32 static void AHI_WaitAudio(_THIS); | |
| 33 static void AHI_PlayAudio(_THIS); | |
| 34 static Uint8 *AHI_GetAudioBuf(_THIS); | |
| 35 static void AHI_CloseAudio(_THIS); | |
| 36 | |
| 37 #ifndef __SASC | |
| 38 #define mymalloc(x) AllocVec(x,MEMF_PUBLIC) | |
| 39 #define myfree FreeVec | |
| 40 #else | |
| 41 #define mymalloc malloc | |
| 42 #define myfree free | |
| 43 #endif | |
| 44 | |
| 45 /* Audio driver bootstrap functions */ | |
| 46 | |
| 47 static int Audio_Available(void) | |
| 48 { | |
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49 int ok=0; |
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50 struct MsgPort *p; |
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51 struct AHIRequest *req; |
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52 |
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53 if(p=CreateMsgPort()) |
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54 { |
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55 if(req=(struct AHIRequest *)CreateIORequest(p,sizeof(struct AHIRequest))) |
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56 { |
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57 req->ahir_Version=4; |
| 0 | 58 |
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59 if(!OpenDevice(AHINAME,0,(struct IORequest *)req,NULL)) |
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60 { |
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61 D(bug("AHI available.\n")); |
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62 ok=1; |
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63 CloseDevice((struct IORequest *)req); |
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64 } |
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65 DeleteIORequest((struct IORequest *)req); |
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66 } |
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67 DeleteMsgPort(p); |
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68 } |
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69 |
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70 D(if(!ok) bug("AHI not available\n")); |
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71 return ok; |
| 0 | 72 } |
| 73 | |
| 74 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 75 { | |
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76 SDL_free(device->hidden); |
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77 SDL_free(device); |
| 0 | 78 } |
| 79 | |
| 80 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 81 { | |
| 82 SDL_AudioDevice *this; | |
| 83 | |
| 84 #ifndef NO_AMIGADEBUG | |
| 85 D(bug("AHI created...\n")); | |
| 86 #endif | |
| 87 | |
| 88 /* Initialize all variables that we clean on shutdown */ | |
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89 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 90 if ( this ) { |
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91 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 92 this->hidden = (struct SDL_PrivateAudioData *) |
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93 SDL_malloc((sizeof *this->hidden)); |
| 0 | 94 } |
| 95 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 96 SDL_OutOfMemory(); | |
| 97 if ( this ) { | |
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98 SDL_free(this); |
| 0 | 99 } |
| 100 return(0); | |
| 101 } | |
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102 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 103 |
| 104 /* Set the function pointers */ | |
| 105 this->OpenAudio = AHI_OpenAudio; | |
| 106 this->WaitAudio = AHI_WaitAudio; | |
| 107 this->PlayAudio = AHI_PlayAudio; | |
| 108 this->GetAudioBuf = AHI_GetAudioBuf; | |
| 109 this->CloseAudio = AHI_CloseAudio; | |
| 110 | |
| 111 this->free = Audio_DeleteDevice; | |
| 112 | |
| 113 return this; | |
| 114 } | |
| 115 | |
| 116 AudioBootStrap AHI_bootstrap = { | |
| 117 "AHI", Audio_Available, Audio_CreateDevice | |
| 118 }; | |
| 119 | |
| 120 | |
| 121 void static AHI_WaitAudio(_THIS) | |
| 122 { | |
| 123 if(!CheckIO((struct IORequest *)audio_req[current_buffer])) | |
| 124 { | |
| 125 WaitIO((struct IORequest *)audio_req[current_buffer]); | |
| 126 // AbortIO((struct IORequest *)audio_req[current_buffer]); | |
| 127 } | |
| 128 } | |
| 129 | |
| 130 static void AHI_PlayAudio(_THIS) | |
| 131 { | |
| 132 if(playing>1) | |
| 133 WaitIO((struct IORequest *)audio_req[current_buffer]); | |
| 134 | |
| 135 /* Write the audio data out */ | |
| 136 audio_req[current_buffer] -> ahir_Std. io_Message.mn_Node.ln_Pri = 60; | |
| 137 audio_req[current_buffer] -> ahir_Std. io_Data = mixbuf[current_buffer]; | |
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138 audio_req[current_buffer] -> ahir_Std. io_Length = this->hidden->size; |
| 0 | 139 audio_req[current_buffer] -> ahir_Std. io_Offset = 0; |
| 140 audio_req[current_buffer] -> ahir_Std . io_Command = CMD_WRITE; | |
| 141 audio_req[current_buffer] -> ahir_Frequency = this->hidden->freq; | |
| 142 audio_req[current_buffer] -> ahir_Volume = 0x10000; | |
| 143 audio_req[current_buffer] -> ahir_Type = this->hidden->type; | |
| 144 audio_req[current_buffer] -> ahir_Position = 0x8000; | |
| 145 audio_req[current_buffer] -> ahir_Link = (playing>0 ? audio_req[current_buffer^1] : NULL); | |
| 146 | |
| 147 SendIO((struct IORequest *)audio_req[current_buffer]); | |
| 148 current_buffer^=1; | |
| 149 | |
| 150 playing++; | |
| 151 } | |
| 152 | |
| 153 static Uint8 *AHI_GetAudioBuf(_THIS) | |
| 154 { | |
| 155 return(mixbuf[current_buffer]); | |
| 156 } | |
| 157 | |
| 158 static void AHI_CloseAudio(_THIS) | |
| 159 { | |
| 160 D(bug("Closing audio...\n")); | |
| 161 | |
| 162 playing=0; | |
| 163 | |
| 164 if(audio_req[0]) | |
| 165 { | |
| 166 if(audio_req[1]) | |
| 167 { | |
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168 D(bug("Break req[1]...\n")); |
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169 |
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170 AbortIO((struct IORequest *)audio_req[1]); |
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171 WaitIO((struct IORequest *)audio_req[1]); |
| 0 | 172 } |
| 173 | |
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174 D(bug("Break req[0]...\n")); |
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175 |
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176 AbortIO((struct IORequest *)audio_req[0]); |
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177 WaitIO((struct IORequest *)audio_req[0]); |
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178 |
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179 if(audio_req[1]) |
| 0 | 180 { |
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181 D(bug("Break AGAIN req[1]...\n")); |
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182 AbortIO((struct IORequest *)audio_req[1]); |
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183 WaitIO((struct IORequest *)audio_req[1]); |
| 0 | 184 } |
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185 // Double abort to be sure to break the dbuffering process. |
| 0 | 186 |
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187 SDL_Delay(200); |
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188 |
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189 D(bug("Reqs breaked, closing device...\n")); |
| 0 | 190 CloseDevice((struct IORequest *)audio_req[0]); |
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191 D(bug("Device closed, freeing memory...\n")); |
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192 myfree(audio_req[1]); |
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193 D(bug("Memory freed, deleting IOReq...\n")); |
| 0 | 194 DeleteIORequest((struct IORequest *)audio_req[0]); |
| 195 audio_req[0]=audio_req[1]=NULL; | |
| 196 } | |
| 197 | |
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198 D(bug("Freeing mixbuf[0]...\n")); |
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199 if ( mixbuf[0] != NULL ) { |
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200 myfree(mixbuf[0]); |
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201 // SDL_FreeAudioMem(mixbuf[0]); |
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202 mixbuf[0] = NULL; |
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203 } |
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204 |
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205 D(bug("Freeing mixbuf[1]...\n")); |
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206 if ( mixbuf[1] != NULL ) { |
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207 myfree(mixbuf[1]); |
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208 // SDL_FreeAudioMem(mixbuf[1]); |
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209 mixbuf[1] = NULL; |
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210 } |
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211 |
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212 D(bug("Freeing audio_port...\n")); |
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213 |
| 0 | 214 if ( audio_port != NULL ) { |
| 215 DeleteMsgPort(audio_port); | |
| 216 audio_port = NULL; | |
| 217 } | |
| 218 D(bug("...done!\n")); | |
| 219 } | |
| 220 | |
| 221 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 222 { | |
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223 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format); |
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224 int valid_datatype = 1; |
| 0 | 225 |
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226 D(bug("AHI opening...\n")); |
| 0 | 227 |
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228 /* Determine the audio parameters from the AudioSpec */ |
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229 while ((!valid_datatype) && (test_format)) { |
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230 valid_datatype = 1; |
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231 switch (test_format) { |
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232 case AUDIO_S8: |
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233 D(bug("AUDIO_S8...\n")); |
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234 spec->format = AUDIO_S8; |
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235 this->hidden->bytespersample = 1; |
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236 if (spec->channels < 2) |
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237 this->hidden->type = AHIST_M8S; |
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238 else |
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239 this->hidden->type = AHIST_S8S; |
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240 break; |
| 0 | 241 |
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242 case AUDIO_S16MSB: |
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243 D(bug("AUDIO_S16MSB...\n")); |
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244 spec->format = AUDIO_S16MSB; |
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245 this->hidden->bytespersample = 2; |
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246 if (spec->channels < 2) |
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247 this->hidden->type = AHIST_M16S; |
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248 else |
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249 this->hidden->type = AHIST_S16S; |
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250 break; |
| 0 | 251 |
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252 default: |
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253 valid_datatype = 0; |
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254 test_format = SDL_NextAudioFormat(); |
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255 break; |
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256 } |
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257 } |
| 0 | 258 |
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259 if (!valid_datatype) { /* shouldn't happen, but just in case... */ |
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260 SDL_SetError("Unsupported audio format"); |
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261 return (-1); |
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262 } |
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263 |
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264 if (spec->channels > 2) { |
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265 spec->channels = 2; /* will convert at higher level. */ |
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266 } |
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267 |
| 0 | 268 D(bug("Before CalculateAudioSpec\n")); |
| 269 /* Update the fragment size as size in bytes */ | |
| 270 SDL_CalculateAudioSpec(spec); | |
| 271 | |
| 272 D(bug("Before CreateMsgPort\n")); | |
| 273 | |
| 274 if(!(audio_port=CreateMsgPort())) | |
| 275 { | |
| 276 SDL_SetError("Unable to create a MsgPort"); | |
| 277 return -1; | |
| 278 } | |
| 279 | |
| 280 D(bug("Before CreateIORequest\n")); | |
| 281 | |
| 282 if(!(audio_req[0]=(struct AHIRequest *)CreateIORequest(audio_port,sizeof(struct AHIRequest)))) | |
| 283 { | |
| 284 SDL_SetError("Unable to create an AHIRequest"); | |
| 285 DeleteMsgPort(audio_port); | |
| 286 return -1; | |
| 287 } | |
| 288 | |
| 289 audio_req[0]->ahir_Version = 4; | |
| 290 | |
| 291 if(OpenDevice(AHINAME,0,(struct IORequest *)audio_req[0],NULL)) | |
| 292 { | |
| 293 SDL_SetError("Unable to open AHI device!\n"); | |
| 294 DeleteIORequest((struct IORequest *)audio_req[0]); | |
| 295 DeleteMsgPort(audio_port); | |
| 296 return -1; | |
| 297 } | |
| 298 | |
| 299 D(bug("AFTER opendevice\n")); | |
| 300 | |
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301 /* Set output frequency and size */ |
| 0 | 302 this->hidden->freq = spec->freq; |
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303 this->hidden->size = spec->size; |
| 0 | 304 |
| 305 D(bug("Before buffer allocation\n")); | |
| 306 | |
| 307 /* Allocate mixing buffer */ | |
| 308 mixbuf[0] = (Uint8 *)mymalloc(spec->size); | |
| 309 mixbuf[1] = (Uint8 *)mymalloc(spec->size); | |
| 310 | |
| 311 D(bug("Before audio_req allocation\n")); | |
| 312 | |
| 313 if(!(audio_req[1]=mymalloc(sizeof(struct AHIRequest)))) | |
| 314 { | |
| 315 SDL_OutOfMemory(); | |
| 316 return(-1); | |
| 317 } | |
| 318 | |
| 319 D(bug("Before audio_req memcpy\n")); | |
| 320 | |
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321 SDL_memcpy(audio_req[1],audio_req[0],sizeof(struct AHIRequest)); |
| 0 | 322 |
| 323 if ( mixbuf[0] == NULL || mixbuf[1] == NULL ) { | |
| 324 SDL_OutOfMemory(); | |
| 325 return(-1); | |
| 326 } | |
| 327 | |
| 328 D(bug("Before mixbuf memset\n")); | |
| 329 | |
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330 SDL_memset(mixbuf[0], spec->silence, spec->size); |
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331 SDL_memset(mixbuf[1], spec->silence, spec->size); |
| 0 | 332 |
| 333 current_buffer=0; | |
| 334 playing=0; | |
| 335 | |
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336 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 | 337 |
| 338 /* We're ready to rock and roll. :-) */ | |
| 339 return(0); | |
| 340 } |