Mercurial > sdl-ios-xcode
annotate src/audio/dsp/SDL_dspaudio.c @ 1135:cf6133247d34
Mac Classic and CodeWarrior patches.
--ryan.
From: =?ISO-8859-1?Q?Anders_F_Bj=F6rklund?= <afb@algonet.se>
Subject: Re: [SDL] Updated Mac patch
Date: Tue, 6 Sep 2005 15:21:27 +0200
To: A list for developers using the SDL library <sdl@libsdl.org>
Earlier, I wrote:
> Updated the previous Mac patch to disable Carbon by default.
> Also "fixed" the SDL.spec again, so that it builds on Darwin.
>
> http://www.algonet.se/~afb/SDL-1.2.9-mac.patch
> Also applied fine to SDL12 CVS, when I tried it.
>
> Haven't completed any new packaging or projects for Xcode/PB,
> but it seems to build and install fine here (in development).
Tested the new patch to build with old CodeWarrior and MPW,
and it seems it needed some hacks with those old headers...
Just in case you want to support the archeological versions -
here is a small add-on to the above patch, to fix those...
http://www.algonet.se/~afb/SDL-1.2.9-classic.patch
I couldn't get the old CW5 projects to build without a few
modifications - such as deleting the stray old header in:
"CWprojects/Support/Carbon/Include/ConditionalMacros.h" ?
But I updated both projects to CW6 too and built for Carbon,
and it ran all of the Mac test projects without any problems.
The MPW file seems to have compiled, with a small order change.
As long as you're still shipping the CWProjects and MPWmake
with the download, they should probably be updated/fixed ?
(another "solution" would of course be to just delete them)
I'll post my new projects along with the new Xcode projects
later on, along with XML exports of the various .mcp files.
(CW5 builds for Classic / "PPC", and CW6 builds for Carbon)
It'll be packaged as a part of the next SpriteWorld X release...
http://spriteworldx.sourceforge.net/ [Classic/Carbon/Win/X11]
--anders
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 08 Sep 2005 06:34:28 +0000 |
| parents | c5dedfdb4e42 |
| children | 644b39bf7253 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 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 | |
|
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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 */ |
| 25 | |
| 26 #ifdef SAVE_RCSID | |
| 27 static char rcsid = | |
| 28 "@(#) $Id$"; | |
| 29 #endif | |
| 30 | |
| 31 /* Allow access to a raw mixing buffer */ | |
| 32 | |
| 33 #include <stdlib.h> | |
| 34 #include <stdio.h> | |
| 35 #include <string.h> | |
| 36 #include <errno.h> | |
| 37 #include <unistd.h> | |
| 38 #include <fcntl.h> | |
| 39 #include <signal.h> | |
| 40 #include <sys/time.h> | |
| 41 #include <sys/ioctl.h> | |
| 42 #include <sys/stat.h> | |
|
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43 #ifdef OSS_USE_SOUNDCARD_H |
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44 /* This is installed on some systems */ |
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45 #include <soundcard.h> |
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46 #else |
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47 /* This is recommended by OSS */ |
| 0 | 48 #include <sys/soundcard.h> |
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49 #endif |
| 0 | 50 |
| 51 #include "SDL_audio.h" | |
| 52 #include "SDL_error.h" | |
| 53 #include "SDL_audiomem.h" | |
| 54 #include "SDL_audio_c.h" | |
| 55 #include "SDL_timer.h" | |
| 56 #include "SDL_audiodev_c.h" | |
| 57 #include "SDL_dspaudio.h" | |
| 58 | |
| 59 /* The tag name used by DSP audio */ | |
| 60 #define DSP_DRIVER_NAME "dsp" | |
| 61 | |
| 62 /* Open the audio device for playback, and don't block if busy */ | |
| 63 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) | |
| 64 | |
| 65 /* Audio driver functions */ | |
| 66 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 67 static void DSP_WaitAudio(_THIS); | |
| 68 static void DSP_PlayAudio(_THIS); | |
| 69 static Uint8 *DSP_GetAudioBuf(_THIS); | |
| 70 static void DSP_CloseAudio(_THIS); | |
| 71 | |
| 72 /* Audio driver bootstrap functions */ | |
| 73 | |
| 74 static int Audio_Available(void) | |
| 75 { | |
| 76 int fd; | |
| 77 int available; | |
| 78 | |
| 79 available = 0; | |
| 80 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); | |
| 81 if ( fd >= 0 ) { | |
| 82 available = 1; | |
| 83 close(fd); | |
| 84 } | |
| 85 return(available); | |
| 86 } | |
| 87 | |
| 88 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 89 { | |
| 90 free(device->hidden); | |
| 91 free(device); | |
| 92 } | |
| 93 | |
| 94 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 95 { | |
| 96 SDL_AudioDevice *this; | |
| 97 | |
| 98 /* Initialize all variables that we clean on shutdown */ | |
| 99 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 100 if ( this ) { | |
| 101 memset(this, 0, (sizeof *this)); | |
| 102 this->hidden = (struct SDL_PrivateAudioData *) | |
| 103 malloc((sizeof *this->hidden)); | |
| 104 } | |
| 105 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 106 SDL_OutOfMemory(); | |
| 107 if ( this ) { | |
| 108 free(this); | |
| 109 } | |
| 110 return(0); | |
| 111 } | |
| 112 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 113 audio_fd = -1; | |
| 114 | |
| 115 /* Set the function pointers */ | |
| 116 this->OpenAudio = DSP_OpenAudio; | |
| 117 this->WaitAudio = DSP_WaitAudio; | |
| 118 this->PlayAudio = DSP_PlayAudio; | |
| 119 this->GetAudioBuf = DSP_GetAudioBuf; | |
| 120 this->CloseAudio = DSP_CloseAudio; | |
| 121 | |
| 122 this->free = Audio_DeleteDevice; | |
| 123 | |
| 124 return this; | |
| 125 } | |
| 126 | |
| 127 AudioBootStrap DSP_bootstrap = { | |
| 128 DSP_DRIVER_NAME, "OSS /dev/dsp standard audio", | |
| 129 Audio_Available, Audio_CreateDevice | |
| 130 }; | |
| 131 | |
| 132 /* This function waits until it is possible to write a full sound buffer */ | |
| 133 static void DSP_WaitAudio(_THIS) | |
| 134 { | |
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135 /* Not needed at all since OSS handles waiting automagically */ |
| 0 | 136 } |
| 137 | |
| 138 static void DSP_PlayAudio(_THIS) | |
| 139 { | |
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140 if (write(audio_fd, mixbuf, mixlen)==-1) |
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141 { |
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142 perror("Audio write"); |
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143 this->enabled = 0; |
| 0 | 144 } |
| 145 | |
| 146 #ifdef DEBUG_AUDIO | |
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147 fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen); |
| 0 | 148 #endif |
| 149 } | |
| 150 | |
| 151 static Uint8 *DSP_GetAudioBuf(_THIS) | |
| 152 { | |
| 153 return(mixbuf); | |
| 154 } | |
| 155 | |
| 156 static void DSP_CloseAudio(_THIS) | |
| 157 { | |
| 158 if ( mixbuf != NULL ) { | |
| 159 SDL_FreeAudioMem(mixbuf); | |
| 160 mixbuf = NULL; | |
| 161 } | |
| 162 if ( audio_fd >= 0 ) { | |
| 163 close(audio_fd); | |
| 164 audio_fd = -1; | |
| 165 } | |
| 166 } | |
| 167 | |
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168 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 0 | 169 { |
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170 char audiodev[1024]; |
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171 int format; |
| 0 | 172 int value; |
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173 int frag_spec; |
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174 Uint16 test_format; |
| 0 | 175 |
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176 /* Open the audio device */ |
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177 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| 0 | 178 if ( audio_fd < 0 ) { |
| 179 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | |
| 180 return(-1); | |
| 181 } | |
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182 mixbuf = NULL; |
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183 |
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184 /* Make the file descriptor use blocking writes with fcntl() */ |
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185 { long flags; |
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186 flags = fcntl(audio_fd, F_GETFL); |
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187 flags &= ~O_NONBLOCK; |
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188 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) { |
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189 SDL_SetError("Couldn't set audio blocking mode"); |
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190 DSP_CloseAudio(this); |
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191 return(-1); |
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192 } |
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193 } |
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194 |
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195 /* Get a list of supported hardware formats */ |
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196 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { |
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197 perror("SNDCTL_DSP_GETFMTS"); |
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198 SDL_SetError("Couldn't get audio format list"); |
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199 DSP_CloseAudio(this); |
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200 return(-1); |
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201 } |
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202 |
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203 /* Try for a closest match on audio format */ |
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204 format = 0; |
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205 for ( test_format = SDL_FirstAudioFormat(spec->format); |
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206 ! format && test_format; ) { |
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207 #ifdef DEBUG_AUDIO |
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208 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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209 #endif |
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210 switch ( test_format ) { |
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211 case AUDIO_U8: |
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212 if ( value & AFMT_U8 ) { |
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213 format = AFMT_U8; |
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214 } |
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215 break; |
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216 case AUDIO_S16LSB: |
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217 if ( value & AFMT_S16_LE ) { |
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218 format = AFMT_S16_LE; |
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219 } |
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220 break; |
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221 case AUDIO_S16MSB: |
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222 if ( value & AFMT_S16_BE ) { |
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223 format = AFMT_S16_BE; |
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224 } |
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225 break; |
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226 #if 0 |
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227 /* |
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228 * These formats are not used by any real life systems so they are not |
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229 * needed here. |
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230 */ |
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231 case AUDIO_S8: |
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232 if ( value & AFMT_S8 ) { |
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233 format = AFMT_S8; |
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234 } |
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235 break; |
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236 case AUDIO_U16LSB: |
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237 if ( value & AFMT_U16_LE ) { |
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238 format = AFMT_U16_LE; |
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239 } |
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240 break; |
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241 case AUDIO_U16MSB: |
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242 if ( value & AFMT_U16_BE ) { |
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243 format = AFMT_U16_BE; |
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244 } |
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245 break; |
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246 #endif |
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247 default: |
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248 format = 0; |
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249 break; |
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250 } |
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251 if ( ! format ) { |
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252 test_format = SDL_NextAudioFormat(); |
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253 } |
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254 } |
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255 if ( format == 0 ) { |
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256 SDL_SetError("Couldn't find any hardware audio formats"); |
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257 DSP_CloseAudio(this); |
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258 return(-1); |
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259 } |
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260 spec->format = test_format; |
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261 |
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262 /* Set the audio format */ |
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263 value = format; |
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264 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || |
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265 (value != format) ) { |
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266 perror("SNDCTL_DSP_SETFMT"); |
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267 SDL_SetError("Couldn't set audio format"); |
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268 DSP_CloseAudio(this); |
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269 return(-1); |
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270 } |
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271 |
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272 /* Set the number of channels of output */ |
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273 value = spec->channels; |
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274 if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) { |
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275 perror("SNDCTL_DSP_CHANNELS"); |
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276 SDL_SetError("Cannot set the number of channels"); |
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277 DSP_CloseAudio(this); |
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278 return(-1); |
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279 } |
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280 spec->channels = value; |
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281 |
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282 /* Set the DSP frequency */ |
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283 value = spec->freq; |
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284 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { |
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285 perror("SNDCTL_DSP_SPEED"); |
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286 SDL_SetError("Couldn't set audio frequency"); |
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287 DSP_CloseAudio(this); |
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288 return(-1); |
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289 } |
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290 spec->freq = value; |
| 0 | 291 |
| 292 /* Calculate the final parameters for this audio specification */ | |
| 293 SDL_CalculateAudioSpec(spec); | |
| 294 | |
| 295 /* Determine the power of two of the fragment size */ | |
| 296 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 297 if ( (0x01<<frag_spec) != spec->size ) { | |
| 298 SDL_SetError("Fragment size must be a power of two"); | |
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299 DSP_CloseAudio(this); |
| 0 | 300 return(-1); |
| 301 } | |
| 302 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 303 | |
| 304 /* Set the audio buffering parameters */ | |
| 305 #ifdef DEBUG_AUDIO | |
| 306 fprintf(stderr, "Requesting %d fragments of size %d\n", | |
| 307 (frag_spec >> 16), 1<<(frag_spec&0xFFFF)); | |
| 308 #endif | |
| 309 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { | |
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310 perror("SNDCTL_DSP_SETFRAGMENT"); |
| 0 | 311 fprintf(stderr, "Warning: Couldn't set audio fragment size\n"); |
| 312 } | |
| 313 #ifdef DEBUG_AUDIO | |
| 314 { audio_buf_info info; | |
| 315 ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info); | |
| 316 fprintf(stderr, "fragments = %d\n", info.fragments); | |
| 317 fprintf(stderr, "fragstotal = %d\n", info.fragstotal); | |
| 318 fprintf(stderr, "fragsize = %d\n", info.fragsize); | |
| 319 fprintf(stderr, "bytes = %d\n", info.bytes); | |
| 320 } | |
| 321 #endif | |
| 322 | |
| 323 /* Allocate mixing buffer */ | |
| 324 mixlen = spec->size; | |
| 325 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 326 if ( mixbuf == NULL ) { | |
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327 DSP_CloseAudio(this); |
| 0 | 328 return(-1); |
| 329 } | |
| 330 memset(mixbuf, spec->silence, spec->size); | |
| 331 | |
| 332 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 333 parent = getpid(); | |
| 334 | |
| 335 /* We're ready to rock and roll. :-) */ | |
| 336 return(0); | |
| 337 } |