Mercurial > sdl-ios-xcode
annotate src/audio/esd/SDL_esdaudio.c @ 864:0c892e99b65b
Date: Sun, 29 Feb 2004 20:28:27 +0200
From: Martin_Storsj
Subject: Slight bug in ESD and aRts
When I experimented with the ALSA-patch, I found a slight bug in the
Load{ESD,ARTS}Library-functions. The check of whether a function pointer
was correctly loaded looks like this right now:
*esd_functions[i].func = SDL_LoadFunction(esd_handle,
esd_functions[i].name);
if ( ! esd_functions[i].func )
Isn't that supposed to be ( ! *esd_functions[i].func )?
author | Sam Lantinga <slouken@libsdl.org> |
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date | Tue, 02 Mar 2004 12:45:22 +0000 |
parents | b8d311d90021 |
children | c9b51268668f |
rev | line source |
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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 |
0 | 21 */ |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
26 #endif | |
27 | |
28 /* Allow access to an ESD network stream mixing buffer */ | |
29 | |
30 #ifdef ESD_SUPPORT | |
31 | |
32 #include <stdlib.h> | |
33 #include <stdio.h> | |
34 #include <string.h> | |
35 #include <errno.h> | |
36 #include <signal.h> | |
37 #include <unistd.h> | |
38 | |
39 #include <esd.h> | |
40 | |
41 #include "SDL_audio.h" | |
42 #include "SDL_error.h" | |
43 #include "SDL_audiomem.h" | |
44 #include "SDL_audio_c.h" | |
45 #include "SDL_timer.h" | |
46 #include "SDL_audiodev_c.h" | |
47 #include "SDL_esdaudio.h" | |
48 | |
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49 #ifdef ESD_DYNAMIC |
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50 #include "SDL_name.h" |
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51 #include "SDL_loadso.h" |
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52 #else |
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53 #define SDL_NAME(X) X |
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54 #endif |
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55 |
0 | 56 /* The tag name used by ESD audio */ |
57 #define ESD_DRIVER_NAME "esd" | |
58 | |
59 /* Audio driver functions */ | |
60 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
61 static void ESD_WaitAudio(_THIS); | |
62 static void ESD_PlayAudio(_THIS); | |
63 static Uint8 *ESD_GetAudioBuf(_THIS); | |
64 static void ESD_CloseAudio(_THIS); | |
65 | |
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66 #ifdef ESD_DYNAMIC |
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67 |
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68 static const char *esd_library = ESD_DYNAMIC; |
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69 static void *esd_handle = NULL; |
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70 static int esd_loaded = 0; |
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71 |
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72 static int (*SDL_NAME(esd_open_sound))( const char *host ); |
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73 static int (*SDL_NAME(esd_close))( int esd ); |
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74 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate, |
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75 const char *host, const char *name ); |
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76 static struct { |
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77 const char *name; |
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78 void **func; |
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79 } esd_functions[] = { |
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80 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) }, |
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81 { "esd_close", (void **)&SDL_NAME(esd_close) }, |
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82 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) }, |
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83 }; |
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84 |
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85 static void UnloadESDLibrary() |
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86 { |
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87 if ( esd_loaded ) { |
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88 SDL_UnloadObject(esd_handle); |
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89 esd_handle = NULL; |
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90 esd_loaded = 0; |
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91 } |
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92 } |
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93 |
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94 static int LoadESDLibrary(void) |
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95 { |
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96 int i, retval = -1; |
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97 |
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98 esd_handle = SDL_LoadObject(esd_library); |
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99 if ( esd_handle ) { |
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100 esd_loaded = 1; |
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101 retval = 0; |
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102 for ( i=0; i<SDL_TABLESIZE(esd_functions); ++i ) { |
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103 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); |
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104 if ( !*esd_functions[i].func ) { |
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105 retval = -1; |
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106 UnloadESDLibrary(); |
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107 break; |
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108 } |
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109 } |
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110 } |
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111 return retval; |
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112 } |
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113 |
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114 #else |
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115 |
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116 static void UnloadESDLibrary() |
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117 { |
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118 return; |
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119 } |
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120 |
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121 static int LoadESDLibrary(void) |
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122 { |
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123 return 0; |
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124 } |
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125 |
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126 #endif /* ESD_DYNAMIC */ |
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127 |
0 | 128 /* Audio driver bootstrap functions */ |
129 | |
130 static int Audio_Available(void) | |
131 { | |
132 int connection; | |
133 int available; | |
134 | |
135 available = 0; | |
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136 if ( LoadESDLibrary() < 0 ) { |
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137 return available; |
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138 } |
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139 connection = SDL_NAME(esd_open_sound)(NULL); |
0 | 140 if ( connection >= 0 ) { |
141 available = 1; | |
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142 SDL_NAME(esd_close)(connection); |
0 | 143 } |
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144 UnloadESDLibrary(); |
0 | 145 return(available); |
146 } | |
147 | |
148 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
149 { | |
150 free(device->hidden); | |
151 free(device); | |
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152 UnloadESDLibrary(); |
0 | 153 } |
154 | |
155 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
156 { | |
157 SDL_AudioDevice *this; | |
158 | |
159 /* Initialize all variables that we clean on shutdown */ | |
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160 LoadESDLibrary(); |
0 | 161 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
162 if ( this ) { | |
163 memset(this, 0, (sizeof *this)); | |
164 this->hidden = (struct SDL_PrivateAudioData *) | |
165 malloc((sizeof *this->hidden)); | |
166 } | |
167 if ( (this == NULL) || (this->hidden == NULL) ) { | |
168 SDL_OutOfMemory(); | |
169 if ( this ) { | |
170 free(this); | |
171 } | |
172 return(0); | |
173 } | |
174 memset(this->hidden, 0, (sizeof *this->hidden)); | |
175 audio_fd = -1; | |
176 | |
177 /* Set the function pointers */ | |
178 this->OpenAudio = ESD_OpenAudio; | |
179 this->WaitAudio = ESD_WaitAudio; | |
180 this->PlayAudio = ESD_PlayAudio; | |
181 this->GetAudioBuf = ESD_GetAudioBuf; | |
182 this->CloseAudio = ESD_CloseAudio; | |
183 | |
184 this->free = Audio_DeleteDevice; | |
185 | |
186 return this; | |
187 } | |
188 | |
189 AudioBootStrap ESD_bootstrap = { | |
190 ESD_DRIVER_NAME, "Enlightened Sound Daemon", | |
191 Audio_Available, Audio_CreateDevice | |
192 }; | |
193 | |
194 /* This function waits until it is possible to write a full sound buffer */ | |
195 static void ESD_WaitAudio(_THIS) | |
196 { | |
197 Sint32 ticks; | |
198 | |
199 /* Check to see if the thread-parent process is still alive */ | |
200 { static int cnt = 0; | |
201 /* Note that this only works with thread implementations | |
202 that use a different process id for each thread. | |
203 */ | |
204 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
205 if ( kill(parent, 0) < 0 ) { | |
206 this->enabled = 0; | |
207 } | |
208 } | |
209 } | |
210 | |
211 /* Use timer for general audio synchronization */ | |
212 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
213 if ( ticks > 0 ) { | |
214 SDL_Delay(ticks); | |
215 } | |
216 } | |
217 | |
218 static void ESD_PlayAudio(_THIS) | |
219 { | |
220 int written; | |
221 | |
222 /* Write the audio data, checking for EAGAIN on broken audio drivers */ | |
223 do { | |
224 written = write(audio_fd, mixbuf, mixlen); | |
225 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { | |
226 SDL_Delay(1); /* Let a little CPU time go by */ | |
227 } | |
228 } while ( (written < 0) && | |
229 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); | |
230 | |
231 /* Set the next write frame */ | |
232 next_frame += frame_ticks; | |
233 | |
234 /* If we couldn't write, assume fatal error for now */ | |
235 if ( written < 0 ) { | |
236 this->enabled = 0; | |
237 } | |
238 } | |
239 | |
240 static Uint8 *ESD_GetAudioBuf(_THIS) | |
241 { | |
242 return(mixbuf); | |
243 } | |
244 | |
245 static void ESD_CloseAudio(_THIS) | |
246 { | |
247 if ( mixbuf != NULL ) { | |
248 SDL_FreeAudioMem(mixbuf); | |
249 mixbuf = NULL; | |
250 } | |
251 if ( audio_fd >= 0 ) { | |
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252 SDL_NAME(esd_close)(audio_fd); |
0 | 253 audio_fd = -1; |
254 } | |
255 } | |
256 | |
257 /* Try to get the name of the program */ | |
258 static char *get_progname(void) | |
259 { | |
260 char *progname = NULL; | |
261 #ifdef linux | |
262 FILE *fp; | |
263 static char temp[BUFSIZ]; | |
264 | |
265 sprintf(temp, "/proc/%d/cmdline", getpid()); | |
266 fp = fopen(temp, "r"); | |
267 if ( fp != NULL ) { | |
268 if ( fgets(temp, sizeof(temp)-1, fp) ) { | |
269 progname = strrchr(temp, '/'); | |
270 if ( progname == NULL ) { | |
271 progname = temp; | |
272 } else { | |
273 progname = progname+1; | |
274 } | |
275 } | |
276 fclose(fp); | |
277 } | |
278 #endif | |
279 return(progname); | |
280 } | |
281 | |
282 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
283 { | |
284 esd_format_t format; | |
285 | |
286 /* Convert audio spec to the ESD audio format */ | |
287 format = (ESD_STREAM | ESD_PLAY); | |
288 switch ( spec->format & 0xFF ) { | |
289 case 8: | |
290 format |= ESD_BITS8; | |
291 break; | |
292 case 16: | |
293 format |= ESD_BITS16; | |
294 break; | |
295 default: | |
296 SDL_SetError("Unsupported ESD audio format"); | |
297 return(-1); | |
298 } | |
299 if ( spec->channels == 1 ) { | |
300 format |= ESD_MONO; | |
301 } else { | |
302 format |= ESD_STEREO; | |
303 } | |
304 #if 0 | |
305 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ | |
306 #endif | |
307 | |
308 /* Open a connection to the ESD audio server */ | |
294
d2d48e10f370
Added a new header file: SDL_loadso.h
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
309 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname()); |
0 | 310 if ( audio_fd < 0 ) { |
311 SDL_SetError("Couldn't open ESD connection"); | |
312 return(-1); | |
313 } | |
314 | |
315 /* Calculate the final parameters for this audio specification */ | |
316 SDL_CalculateAudioSpec(spec); | |
317 frame_ticks = (float)(spec->samples*1000)/spec->freq; | |
318 next_frame = SDL_GetTicks()+frame_ticks; | |
319 | |
320 /* Allocate mixing buffer */ | |
321 mixlen = spec->size; | |
322 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
323 if ( mixbuf == NULL ) { | |
324 return(-1); | |
325 } | |
326 memset(mixbuf, spec->silence, spec->size); | |
327 | |
328 /* Get the parent process id (we're the parent of the audio thread) */ | |
329 parent = getpid(); | |
330 | |
331 /* We're ready to rock and roll. :-) */ | |
332 return(0); | |
333 } | |
334 | |
335 #endif /* ESD_SUPPORT */ |