root / audio / sdlaudio.c @ cbeb0857
History | View | Annotate | Download (9.7 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 "vl.h" |
27 |
|
28 |
#define AUDIO_CAP "sdl" |
29 |
#include "audio_int.h" |
30 |
|
31 |
typedef struct SDLVoiceOut { |
32 |
HWVoiceOut hw; |
33 |
int live;
|
34 |
int rpos;
|
35 |
int decr;
|
36 |
} SDLVoiceOut; |
37 |
|
38 |
static struct { |
39 |
int nb_samples;
|
40 |
} conf = { |
41 |
1024
|
42 |
}; |
43 |
|
44 |
struct SDLAudioState {
|
45 |
int exit;
|
46 |
SDL_mutex *mutex; |
47 |
SDL_sem *sem; |
48 |
int initialized;
|
49 |
} glob_sdl; |
50 |
typedef struct SDLAudioState SDLAudioState; |
51 |
|
52 |
static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...) |
53 |
{ |
54 |
va_list ap; |
55 |
|
56 |
va_start (ap, fmt); |
57 |
AUD_vlog (AUDIO_CAP, fmt, ap); |
58 |
va_end (ap); |
59 |
|
60 |
AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
|
61 |
} |
62 |
|
63 |
static int sdl_lock (SDLAudioState *s, const char *forfn) |
64 |
{ |
65 |
if (SDL_LockMutex (s->mutex)) {
|
66 |
sdl_logerr ("SDL_LockMutex for %s failed\n", forfn);
|
67 |
return -1; |
68 |
} |
69 |
return 0; |
70 |
} |
71 |
|
72 |
static int sdl_unlock (SDLAudioState *s, const char *forfn) |
73 |
{ |
74 |
if (SDL_UnlockMutex (s->mutex)) {
|
75 |
sdl_logerr ("SDL_UnlockMutex for %s failed\n", forfn);
|
76 |
return -1; |
77 |
} |
78 |
return 0; |
79 |
} |
80 |
|
81 |
static int sdl_post (SDLAudioState *s, const char *forfn) |
82 |
{ |
83 |
if (SDL_SemPost (s->sem)) {
|
84 |
sdl_logerr ("SDL_SemPost for %s failed\n", forfn);
|
85 |
return -1; |
86 |
} |
87 |
return 0; |
88 |
} |
89 |
|
90 |
static int sdl_wait (SDLAudioState *s, const char *forfn) |
91 |
{ |
92 |
if (SDL_SemWait (s->sem)) {
|
93 |
sdl_logerr ("SDL_SemWait for %s failed\n", forfn);
|
94 |
return -1; |
95 |
} |
96 |
return 0; |
97 |
} |
98 |
|
99 |
static int sdl_unlock_and_post (SDLAudioState *s, const char *forfn) |
100 |
{ |
101 |
if (sdl_unlock (s, forfn)) {
|
102 |
return -1; |
103 |
} |
104 |
|
105 |
return sdl_post (s, forfn);
|
106 |
} |
107 |
|
108 |
static int aud_to_sdlfmt (audfmt_e fmt, int *shift) |
109 |
{ |
110 |
switch (fmt) {
|
111 |
case AUD_FMT_S8:
|
112 |
*shift = 0;
|
113 |
return AUDIO_S8;
|
114 |
|
115 |
case AUD_FMT_U8:
|
116 |
*shift = 0;
|
117 |
return AUDIO_U8;
|
118 |
|
119 |
case AUD_FMT_S16:
|
120 |
*shift = 1;
|
121 |
return AUDIO_S16LSB;
|
122 |
|
123 |
case AUD_FMT_U16:
|
124 |
*shift = 1;
|
125 |
return AUDIO_U16LSB;
|
126 |
|
127 |
default:
|
128 |
dolog ("Internal logic error: Bad audio format %d\n", fmt);
|
129 |
#ifdef DEBUG_AUDIO
|
130 |
abort (); |
131 |
#endif
|
132 |
return AUDIO_U8;
|
133 |
} |
134 |
} |
135 |
|
136 |
static int sdl_to_audfmt (int sdlfmt, audfmt_e *fmt, int *endianess) |
137 |
{ |
138 |
switch (sdlfmt) {
|
139 |
case AUDIO_S8:
|
140 |
*endianess = 0;
|
141 |
*fmt = AUD_FMT_S8; |
142 |
break;
|
143 |
|
144 |
case AUDIO_U8:
|
145 |
*endianess = 0;
|
146 |
*fmt = AUD_FMT_U8; |
147 |
break;
|
148 |
|
149 |
case AUDIO_S16LSB:
|
150 |
*endianess = 0;
|
151 |
*fmt = AUD_FMT_S16; |
152 |
break;
|
153 |
|
154 |
case AUDIO_U16LSB:
|
155 |
*endianess = 0;
|
156 |
*fmt = AUD_FMT_U16; |
157 |
break;
|
158 |
|
159 |
case AUDIO_S16MSB:
|
160 |
*endianess = 1;
|
161 |
*fmt = AUD_FMT_S16; |
162 |
break;
|
163 |
|
164 |
case AUDIO_U16MSB:
|
165 |
*endianess = 1;
|
166 |
*fmt = AUD_FMT_U16; |
167 |
break;
|
168 |
|
169 |
default:
|
170 |
dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
|
171 |
return -1; |
172 |
} |
173 |
|
174 |
return 0; |
175 |
} |
176 |
|
177 |
static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt) |
178 |
{ |
179 |
int status;
|
180 |
|
181 |
status = SDL_OpenAudio (req, obt); |
182 |
if (status) {
|
183 |
sdl_logerr ("SDL_OpenAudio failed\n");
|
184 |
} |
185 |
return status;
|
186 |
} |
187 |
|
188 |
static void sdl_close (SDLAudioState *s) |
189 |
{ |
190 |
if (s->initialized) {
|
191 |
sdl_lock (s, "sdl_close");
|
192 |
s->exit = 1;
|
193 |
sdl_unlock_and_post (s, "sdl_close");
|
194 |
SDL_PauseAudio (1);
|
195 |
SDL_CloseAudio (); |
196 |
s->initialized = 0;
|
197 |
} |
198 |
} |
199 |
|
200 |
static void sdl_callback (void *opaque, Uint8 *buf, int len) |
201 |
{ |
202 |
SDLVoiceOut *sdl = opaque; |
203 |
SDLAudioState *s = &glob_sdl; |
204 |
HWVoiceOut *hw = &sdl->hw; |
205 |
int samples = len >> hw->info.shift;
|
206 |
|
207 |
if (s->exit) {
|
208 |
return;
|
209 |
} |
210 |
|
211 |
while (samples) {
|
212 |
int to_mix, decr;
|
213 |
|
214 |
/* dolog ("in callback samples=%d\n", samples); */
|
215 |
sdl_wait (s, "sdl_callback");
|
216 |
if (s->exit) {
|
217 |
return;
|
218 |
} |
219 |
|
220 |
if (sdl_lock (s, "sdl_callback")) { |
221 |
return;
|
222 |
} |
223 |
|
224 |
if (audio_bug (AUDIO_FUNC, sdl->live < 0 || sdl->live > hw->samples)) { |
225 |
dolog ("sdl->live=%d hw->samples=%d\n",
|
226 |
sdl->live, hw->samples); |
227 |
return;
|
228 |
} |
229 |
|
230 |
if (!sdl->live) {
|
231 |
goto again;
|
232 |
} |
233 |
|
234 |
/* dolog ("in callback live=%d\n", live); */
|
235 |
to_mix = audio_MIN (samples, sdl->live); |
236 |
decr = to_mix; |
237 |
while (to_mix) {
|
238 |
int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
|
239 |
st_sample_t *src = hw->mix_buf + hw->rpos; |
240 |
|
241 |
/* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
|
242 |
hw->clip (buf, src, chunk); |
243 |
sdl->rpos = (sdl->rpos + chunk) % hw->samples; |
244 |
to_mix -= chunk; |
245 |
buf += chunk << hw->info.shift; |
246 |
} |
247 |
samples -= decr; |
248 |
sdl->live -= decr; |
249 |
sdl->decr += decr; |
250 |
|
251 |
again:
|
252 |
if (sdl_unlock (s, "sdl_callback")) { |
253 |
return;
|
254 |
} |
255 |
} |
256 |
/* dolog ("done len=%d\n", len); */
|
257 |
} |
258 |
|
259 |
static int sdl_write_out (SWVoiceOut *sw, void *buf, int len) |
260 |
{ |
261 |
return audio_pcm_sw_write (sw, buf, len);
|
262 |
} |
263 |
|
264 |
static int sdl_run_out (HWVoiceOut *hw) |
265 |
{ |
266 |
int decr, live;
|
267 |
SDLVoiceOut *sdl = (SDLVoiceOut *) hw; |
268 |
SDLAudioState *s = &glob_sdl; |
269 |
|
270 |
if (sdl_lock (s, "sdl_callback")) { |
271 |
return 0; |
272 |
} |
273 |
|
274 |
live = audio_pcm_hw_get_live_out (hw); |
275 |
|
276 |
if (sdl->decr > live) {
|
277 |
ldebug ("sdl->decr %d live %d sdl->live %d\n",
|
278 |
sdl->decr, |
279 |
live, |
280 |
sdl->live); |
281 |
} |
282 |
|
283 |
decr = audio_MIN (sdl->decr, live); |
284 |
sdl->decr -= decr; |
285 |
|
286 |
sdl->live = live - decr; |
287 |
hw->rpos = sdl->rpos; |
288 |
|
289 |
if (sdl->live > 0) { |
290 |
sdl_unlock_and_post (s, "sdl_callback");
|
291 |
} |
292 |
else {
|
293 |
sdl_unlock (s, "sdl_callback");
|
294 |
} |
295 |
return decr;
|
296 |
} |
297 |
|
298 |
static void sdl_fini_out (HWVoiceOut *hw) |
299 |
{ |
300 |
(void) hw;
|
301 |
|
302 |
sdl_close (&glob_sdl); |
303 |
} |
304 |
|
305 |
static int sdl_init_out (HWVoiceOut *hw, audsettings_t *as) |
306 |
{ |
307 |
SDLVoiceOut *sdl = (SDLVoiceOut *) hw; |
308 |
SDLAudioState *s = &glob_sdl; |
309 |
SDL_AudioSpec req, obt; |
310 |
int shift;
|
311 |
int endianess;
|
312 |
int err;
|
313 |
audfmt_e effective_fmt; |
314 |
audsettings_t obt_as; |
315 |
|
316 |
shift <<= as->nchannels == 2;
|
317 |
|
318 |
req.freq = as->freq; |
319 |
req.format = aud_to_sdlfmt (as->fmt, &shift); |
320 |
req.channels = as->nchannels; |
321 |
req.samples = conf.nb_samples; |
322 |
req.callback = sdl_callback; |
323 |
req.userdata = sdl; |
324 |
|
325 |
if (sdl_open (&req, &obt)) {
|
326 |
return -1; |
327 |
} |
328 |
|
329 |
err = sdl_to_audfmt (obt.format, &effective_fmt, &endianess); |
330 |
if (err) {
|
331 |
sdl_close (s); |
332 |
return -1; |
333 |
} |
334 |
|
335 |
obt_as.freq = obt.freq; |
336 |
obt_as.nchannels = obt.channels; |
337 |
obt_as.fmt = effective_fmt; |
338 |
obt_as.endianness = endianess; |
339 |
|
340 |
audio_pcm_init_info (&hw->info, &obt_as); |
341 |
hw->samples = obt.samples; |
342 |
|
343 |
s->initialized = 1;
|
344 |
s->exit = 0;
|
345 |
SDL_PauseAudio (0);
|
346 |
return 0; |
347 |
} |
348 |
|
349 |
static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...) |
350 |
{ |
351 |
(void) hw;
|
352 |
|
353 |
switch (cmd) {
|
354 |
case VOICE_ENABLE:
|
355 |
SDL_PauseAudio (0);
|
356 |
break;
|
357 |
|
358 |
case VOICE_DISABLE:
|
359 |
SDL_PauseAudio (1);
|
360 |
break;
|
361 |
} |
362 |
return 0; |
363 |
} |
364 |
|
365 |
static void *sdl_audio_init (void) |
366 |
{ |
367 |
SDLAudioState *s = &glob_sdl; |
368 |
|
369 |
if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
|
370 |
sdl_logerr ("SDL failed to initialize audio subsystem\n");
|
371 |
return NULL; |
372 |
} |
373 |
|
374 |
s->mutex = SDL_CreateMutex (); |
375 |
if (!s->mutex) {
|
376 |
sdl_logerr ("Failed to create SDL mutex\n");
|
377 |
SDL_QuitSubSystem (SDL_INIT_AUDIO); |
378 |
return NULL; |
379 |
} |
380 |
|
381 |
s->sem = SDL_CreateSemaphore (0);
|
382 |
if (!s->sem) {
|
383 |
sdl_logerr ("Failed to create SDL semaphore\n");
|
384 |
SDL_DestroyMutex (s->mutex); |
385 |
SDL_QuitSubSystem (SDL_INIT_AUDIO); |
386 |
return NULL; |
387 |
} |
388 |
|
389 |
return s;
|
390 |
} |
391 |
|
392 |
static void sdl_audio_fini (void *opaque) |
393 |
{ |
394 |
SDLAudioState *s = opaque; |
395 |
sdl_close (s); |
396 |
SDL_DestroySemaphore (s->sem); |
397 |
SDL_DestroyMutex (s->mutex); |
398 |
SDL_QuitSubSystem (SDL_INIT_AUDIO); |
399 |
} |
400 |
|
401 |
static struct audio_option sdl_options[] = { |
402 |
{"SAMPLES", AUD_OPT_INT, &conf.nb_samples,
|
403 |
"Size of SDL buffer in samples", NULL, 0}, |
404 |
{NULL, 0, NULL, NULL, NULL, 0} |
405 |
}; |
406 |
|
407 |
static struct audio_pcm_ops sdl_pcm_ops = { |
408 |
sdl_init_out, |
409 |
sdl_fini_out, |
410 |
sdl_run_out, |
411 |
sdl_write_out, |
412 |
sdl_ctl_out, |
413 |
|
414 |
NULL,
|
415 |
NULL,
|
416 |
NULL,
|
417 |
NULL,
|
418 |
NULL
|
419 |
}; |
420 |
|
421 |
struct audio_driver sdl_audio_driver = {
|
422 |
INIT_FIELD (name = ) "sdl",
|
423 |
INIT_FIELD (descr = ) "SDL http://www.libsdl.org",
|
424 |
INIT_FIELD (options = ) sdl_options, |
425 |
INIT_FIELD (init = ) sdl_audio_init, |
426 |
INIT_FIELD (fini = ) sdl_audio_fini, |
427 |
INIT_FIELD (pcm_ops = ) &sdl_pcm_ops, |
428 |
INIT_FIELD (can_be_default = ) 1,
|
429 |
INIT_FIELD (max_voices_out = ) 1,
|
430 |
INIT_FIELD (max_voices_in = ) 0,
|
431 |
INIT_FIELD (voice_size_out = ) sizeof (SDLVoiceOut),
|
432 |
INIT_FIELD (voice_size_in = ) 0
|
433 |
}; |