root / audio / sdlaudio.c @ fd5723b3
History | View | Annotate | Download (10.4 kB)
1 |
/*
|
---|---|
2 |
* QEMU SDL audio driver
|
3 |
*
|
4 |
* Copyright (c) 2004-2005 Vassili Karpov (malc)
|
5 |
*
|
6 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
7 |
* of this software and associated documentation files (the "Software"), to deal
|
8 |
* in the Software without restriction, including without limitation the rights
|
9 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
10 |
* copies of the Software, and to permit persons to whom the Software is
|
11 |
* furnished to do so, subject to the following conditions:
|
12 |
*
|
13 |
* The above copyright notice and this permission notice shall be included in
|
14 |
* all copies or substantial portions of the Software.
|
15 |
*
|
16 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
17 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
18 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
19 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
20 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
21 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
22 |
* THE SOFTWARE.
|
23 |
*/
|
24 |
#include <SDL.h> |
25 |
#include <SDL_thread.h> |
26 |
#include "qemu-common.h" |
27 |
#include "audio.h" |
28 |
|
29 |
#ifndef _WIN32
|
30 |
#ifdef __sun__
|
31 |
#define _POSIX_PTHREAD_SEMANTICS 1 |
32 |
#elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
|
33 |
#include <pthread.h> |
34 |
#endif
|
35 |
#include <signal.h> |
36 |
#endif
|
37 |
|
38 |
#define AUDIO_CAP "sdl" |
39 |
#include "audio_int.h" |
40 |
|
41 |
typedef struct SDLVoiceOut { |
42 |
HWVoiceOut hw; |
43 |
int live;
|
44 |
int rpos;
|
45 |
int decr;
|
46 |
} SDLVoiceOut; |
47 |
|
48 |
static struct { |
49 |
int nb_samples;
|
50 |
} conf = { |
51 |
.nb_samples = 1024
|
52 |
}; |
53 |
|
54 |
static struct SDLAudioState { |
55 |
int exit;
|
56 |
SDL_mutex *mutex; |
57 |
SDL_sem *sem; |
58 |
int initialized;
|
59 |
} glob_sdl; |
60 |
typedef struct SDLAudioState SDLAudioState; |
61 |
|
62 |
static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...) |
63 |
{ |
64 |
va_list ap; |
65 |
|
66 |
va_start (ap, fmt); |
67 |
AUD_vlog (AUDIO_CAP, fmt, ap); |
68 |
va_end (ap); |
69 |
|
70 |
AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
|
71 |
} |
72 |
|
73 |
static int sdl_lock (SDLAudioState *s, const char *forfn) |
74 |
{ |
75 |
if (SDL_LockMutex (s->mutex)) {
|
76 |
sdl_logerr ("SDL_LockMutex for %s failed\n", forfn);
|
77 |
return -1; |
78 |
} |
79 |
return 0; |
80 |
} |
81 |
|
82 |
static int sdl_unlock (SDLAudioState *s, const char *forfn) |
83 |
{ |
84 |
if (SDL_UnlockMutex (s->mutex)) {
|
85 |
sdl_logerr ("SDL_UnlockMutex for %s failed\n", forfn);
|
86 |
return -1; |
87 |
} |
88 |
return 0; |
89 |
} |
90 |
|
91 |
static int sdl_post (SDLAudioState *s, const char *forfn) |
92 |
{ |
93 |
if (SDL_SemPost (s->sem)) {
|
94 |
sdl_logerr ("SDL_SemPost for %s failed\n", forfn);
|
95 |
return -1; |
96 |
} |
97 |
return 0; |
98 |
} |
99 |
|
100 |
static int sdl_wait (SDLAudioState *s, const char *forfn) |
101 |
{ |
102 |
if (SDL_SemWait (s->sem)) {
|
103 |
sdl_logerr ("SDL_SemWait for %s failed\n", forfn);
|
104 |
return -1; |
105 |
} |
106 |
return 0; |
107 |
} |
108 |
|
109 |
static int sdl_unlock_and_post (SDLAudioState *s, const char *forfn) |
110 |
{ |
111 |
if (sdl_unlock (s, forfn)) {
|
112 |
return -1; |
113 |
} |
114 |
|
115 |
return sdl_post (s, forfn);
|
116 |
} |
117 |
|
118 |
static int aud_to_sdlfmt (audfmt_e fmt) |
119 |
{ |
120 |
switch (fmt) {
|
121 |
case AUD_FMT_S8:
|
122 |
return AUDIO_S8;
|
123 |
|
124 |
case AUD_FMT_U8:
|
125 |
return AUDIO_U8;
|
126 |
|
127 |
case AUD_FMT_S16:
|
128 |
return AUDIO_S16LSB;
|
129 |
|
130 |
case AUD_FMT_U16:
|
131 |
return AUDIO_U16LSB;
|
132 |
|
133 |
default:
|
134 |
dolog ("Internal logic error: Bad audio format %d\n", fmt);
|
135 |
#ifdef DEBUG_AUDIO
|
136 |
abort (); |
137 |
#endif
|
138 |
return AUDIO_U8;
|
139 |
} |
140 |
} |
141 |
|
142 |
static int sdl_to_audfmt (int sdlfmt, audfmt_e *fmt, int *endianess) |
143 |
{ |
144 |
switch (sdlfmt) {
|
145 |
case AUDIO_S8:
|
146 |
*endianess = 0;
|
147 |
*fmt = AUD_FMT_S8; |
148 |
break;
|
149 |
|
150 |
case AUDIO_U8:
|
151 |
*endianess = 0;
|
152 |
*fmt = AUD_FMT_U8; |
153 |
break;
|
154 |
|
155 |
case AUDIO_S16LSB:
|
156 |
*endianess = 0;
|
157 |
*fmt = AUD_FMT_S16; |
158 |
break;
|
159 |
|
160 |
case AUDIO_U16LSB:
|
161 |
*endianess = 0;
|
162 |
*fmt = AUD_FMT_U16; |
163 |
break;
|
164 |
|
165 |
case AUDIO_S16MSB:
|
166 |
*endianess = 1;
|
167 |
*fmt = AUD_FMT_S16; |
168 |
break;
|
169 |
|
170 |
case AUDIO_U16MSB:
|
171 |
*endianess = 1;
|
172 |
*fmt = AUD_FMT_U16; |
173 |
break;
|
174 |
|
175 |
default:
|
176 |
dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
|
177 |
return -1; |
178 |
} |
179 |
|
180 |
return 0; |
181 |
} |
182 |
|
183 |
static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt) |
184 |
{ |
185 |
int status;
|
186 |
#ifndef _WIN32
|
187 |
int err;
|
188 |
sigset_t new, old; |
189 |
|
190 |
/* Make sure potential threads created by SDL don't hog signals. */
|
191 |
err = sigfillset (&new); |
192 |
if (err) {
|
193 |
dolog ("sdl_open: sigfillset failed: %s\n", strerror (errno));
|
194 |
return -1; |
195 |
} |
196 |
err = pthread_sigmask (SIG_BLOCK, &new, &old); |
197 |
if (err) {
|
198 |
dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err));
|
199 |
return -1; |
200 |
} |
201 |
#endif
|
202 |
|
203 |
status = SDL_OpenAudio (req, obt); |
204 |
if (status) {
|
205 |
sdl_logerr ("SDL_OpenAudio failed\n");
|
206 |
} |
207 |
|
208 |
#ifndef _WIN32
|
209 |
err = pthread_sigmask (SIG_SETMASK, &old, NULL);
|
210 |
if (err) {
|
211 |
dolog ("sdl_open: pthread_sigmask (restore) failed: %s\n",
|
212 |
strerror (errno)); |
213 |
/* We have failed to restore original signal mask, all bets are off,
|
214 |
so exit the process */
|
215 |
exit (EXIT_FAILURE); |
216 |
} |
217 |
#endif
|
218 |
return status;
|
219 |
} |
220 |
|
221 |
static void sdl_close (SDLAudioState *s) |
222 |
{ |
223 |
if (s->initialized) {
|
224 |
sdl_lock (s, "sdl_close");
|
225 |
s->exit = 1;
|
226 |
sdl_unlock_and_post (s, "sdl_close");
|
227 |
SDL_PauseAudio (1);
|
228 |
SDL_CloseAudio (); |
229 |
s->initialized = 0;
|
230 |
} |
231 |
} |
232 |
|
233 |
static void sdl_callback (void *opaque, Uint8 *buf, int len) |
234 |
{ |
235 |
SDLVoiceOut *sdl = opaque; |
236 |
SDLAudioState *s = &glob_sdl; |
237 |
HWVoiceOut *hw = &sdl->hw; |
238 |
int samples = len >> hw->info.shift;
|
239 |
|
240 |
if (s->exit) {
|
241 |
return;
|
242 |
} |
243 |
|
244 |
while (samples) {
|
245 |
int to_mix, decr;
|
246 |
|
247 |
/* dolog ("in callback samples=%d\n", samples); */
|
248 |
sdl_wait (s, "sdl_callback");
|
249 |
if (s->exit) {
|
250 |
return;
|
251 |
} |
252 |
|
253 |
if (sdl_lock (s, "sdl_callback")) { |
254 |
return;
|
255 |
} |
256 |
|
257 |
if (audio_bug (AUDIO_FUNC, sdl->live < 0 || sdl->live > hw->samples)) { |
258 |
dolog ("sdl->live=%d hw->samples=%d\n",
|
259 |
sdl->live, hw->samples); |
260 |
return;
|
261 |
} |
262 |
|
263 |
if (!sdl->live) {
|
264 |
goto again;
|
265 |
} |
266 |
|
267 |
/* dolog ("in callback live=%d\n", live); */
|
268 |
to_mix = audio_MIN (samples, sdl->live); |
269 |
decr = to_mix; |
270 |
while (to_mix) {
|
271 |
int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
|
272 |
struct st_sample *src = hw->mix_buf + hw->rpos;
|
273 |
|
274 |
/* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
|
275 |
hw->clip (buf, src, chunk); |
276 |
sdl->rpos = (sdl->rpos + chunk) % hw->samples; |
277 |
to_mix -= chunk; |
278 |
buf += chunk << hw->info.shift; |
279 |
} |
280 |
samples -= decr; |
281 |
sdl->live -= decr; |
282 |
sdl->decr += decr; |
283 |
|
284 |
again:
|
285 |
if (sdl_unlock (s, "sdl_callback")) { |
286 |
return;
|
287 |
} |
288 |
} |
289 |
/* dolog ("done len=%d\n", len); */
|
290 |
} |
291 |
|
292 |
static int sdl_write_out (SWVoiceOut *sw, void *buf, int len) |
293 |
{ |
294 |
return audio_pcm_sw_write (sw, buf, len);
|
295 |
} |
296 |
|
297 |
static int sdl_run_out (HWVoiceOut *hw, int live) |
298 |
{ |
299 |
int decr;
|
300 |
SDLVoiceOut *sdl = (SDLVoiceOut *) hw; |
301 |
SDLAudioState *s = &glob_sdl; |
302 |
|
303 |
if (sdl_lock (s, "sdl_run_out")) { |
304 |
return 0; |
305 |
} |
306 |
|
307 |
if (sdl->decr > live) {
|
308 |
ldebug ("sdl->decr %d live %d sdl->live %d\n",
|
309 |
sdl->decr, |
310 |
live, |
311 |
sdl->live); |
312 |
} |
313 |
|
314 |
decr = audio_MIN (sdl->decr, live); |
315 |
sdl->decr -= decr; |
316 |
|
317 |
sdl->live = live - decr; |
318 |
hw->rpos = sdl->rpos; |
319 |
|
320 |
if (sdl->live > 0) { |
321 |
sdl_unlock_and_post (s, "sdl_run_out");
|
322 |
} |
323 |
else {
|
324 |
sdl_unlock (s, "sdl_run_out");
|
325 |
} |
326 |
return decr;
|
327 |
} |
328 |
|
329 |
static void sdl_fini_out (HWVoiceOut *hw) |
330 |
{ |
331 |
(void) hw;
|
332 |
|
333 |
sdl_close (&glob_sdl); |
334 |
} |
335 |
|
336 |
static int sdl_init_out (HWVoiceOut *hw, struct audsettings *as) |
337 |
{ |
338 |
SDLVoiceOut *sdl = (SDLVoiceOut *) hw; |
339 |
SDLAudioState *s = &glob_sdl; |
340 |
SDL_AudioSpec req, obt; |
341 |
int endianess;
|
342 |
int err;
|
343 |
audfmt_e effective_fmt; |
344 |
struct audsettings obt_as;
|
345 |
|
346 |
req.freq = as->freq; |
347 |
req.format = aud_to_sdlfmt (as->fmt); |
348 |
req.channels = as->nchannels; |
349 |
req.samples = conf.nb_samples; |
350 |
req.callback = sdl_callback; |
351 |
req.userdata = sdl; |
352 |
|
353 |
if (sdl_open (&req, &obt)) {
|
354 |
return -1; |
355 |
} |
356 |
|
357 |
err = sdl_to_audfmt (obt.format, &effective_fmt, &endianess); |
358 |
if (err) {
|
359 |
sdl_close (s); |
360 |
return -1; |
361 |
} |
362 |
|
363 |
obt_as.freq = obt.freq; |
364 |
obt_as.nchannels = obt.channels; |
365 |
obt_as.fmt = effective_fmt; |
366 |
obt_as.endianness = endianess; |
367 |
|
368 |
audio_pcm_init_info (&hw->info, &obt_as); |
369 |
hw->samples = obt.samples; |
370 |
|
371 |
s->initialized = 1;
|
372 |
s->exit = 0;
|
373 |
SDL_PauseAudio (0);
|
374 |
return 0; |
375 |
} |
376 |
|
377 |
static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...) |
378 |
{ |
379 |
(void) hw;
|
380 |
|
381 |
switch (cmd) {
|
382 |
case VOICE_ENABLE:
|
383 |
SDL_PauseAudio (0);
|
384 |
break;
|
385 |
|
386 |
case VOICE_DISABLE:
|
387 |
SDL_PauseAudio (1);
|
388 |
break;
|
389 |
} |
390 |
return 0; |
391 |
} |
392 |
|
393 |
static void *sdl_audio_init (void) |
394 |
{ |
395 |
SDLAudioState *s = &glob_sdl; |
396 |
|
397 |
if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
|
398 |
sdl_logerr ("SDL failed to initialize audio subsystem\n");
|
399 |
return NULL; |
400 |
} |
401 |
|
402 |
s->mutex = SDL_CreateMutex (); |
403 |
if (!s->mutex) {
|
404 |
sdl_logerr ("Failed to create SDL mutex\n");
|
405 |
SDL_QuitSubSystem (SDL_INIT_AUDIO); |
406 |
return NULL; |
407 |
} |
408 |
|
409 |
s->sem = SDL_CreateSemaphore (0);
|
410 |
if (!s->sem) {
|
411 |
sdl_logerr ("Failed to create SDL semaphore\n");
|
412 |
SDL_DestroyMutex (s->mutex); |
413 |
SDL_QuitSubSystem (SDL_INIT_AUDIO); |
414 |
return NULL; |
415 |
} |
416 |
|
417 |
return s;
|
418 |
} |
419 |
|
420 |
static void sdl_audio_fini (void *opaque) |
421 |
{ |
422 |
SDLAudioState *s = opaque; |
423 |
sdl_close (s); |
424 |
SDL_DestroySemaphore (s->sem); |
425 |
SDL_DestroyMutex (s->mutex); |
426 |
SDL_QuitSubSystem (SDL_INIT_AUDIO); |
427 |
} |
428 |
|
429 |
static struct audio_option sdl_options[] = { |
430 |
{ |
431 |
.name = "SAMPLES",
|
432 |
.tag = AUD_OPT_INT, |
433 |
.valp = &conf.nb_samples, |
434 |
.descr = "Size of SDL buffer in samples"
|
435 |
}, |
436 |
{ /* End of list */ }
|
437 |
}; |
438 |
|
439 |
static struct audio_pcm_ops sdl_pcm_ops = { |
440 |
.init_out = sdl_init_out, |
441 |
.fini_out = sdl_fini_out, |
442 |
.run_out = sdl_run_out, |
443 |
.write = sdl_write_out, |
444 |
.ctl_out = sdl_ctl_out, |
445 |
}; |
446 |
|
447 |
struct audio_driver sdl_audio_driver = {
|
448 |
.name = "sdl",
|
449 |
.descr = "SDL http://www.libsdl.org",
|
450 |
.options = sdl_options, |
451 |
.init = sdl_audio_init, |
452 |
.fini = sdl_audio_fini, |
453 |
.pcm_ops = &sdl_pcm_ops, |
454 |
.can_be_default = 1,
|
455 |
.max_voices_out = 1,
|
456 |
.max_voices_in = 0,
|
457 |
.voice_size_out = sizeof (SDLVoiceOut),
|
458 |
.voice_size_in = 0
|
459 |
}; |