2 * QEMU SDL audio driver
4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
25 #include <SDL_thread.h>
26 #include "qemu-common.h"
31 #define _POSIX_PTHREAD_SEMANTICS 1
32 #elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
38 #define AUDIO_CAP "sdl"
39 #include "audio_int.h"
41 typedef struct SDLVoiceOut {
54 static struct SDLAudioState {
60 typedef struct SDLAudioState SDLAudioState;
62 static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...)
67 AUD_vlog (AUDIO_CAP, fmt, ap);
70 AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
73 static int sdl_lock (SDLAudioState *s, const char *forfn)
75 if (SDL_LockMutex (s->mutex)) {
76 sdl_logerr ("SDL_LockMutex for %s failed\n", forfn);
82 static int sdl_unlock (SDLAudioState *s, const char *forfn)
84 if (SDL_UnlockMutex (s->mutex)) {
85 sdl_logerr ("SDL_UnlockMutex for %s failed\n", forfn);
91 static int sdl_post (SDLAudioState *s, const char *forfn)
93 if (SDL_SemPost (s->sem)) {
94 sdl_logerr ("SDL_SemPost for %s failed\n", forfn);
100 static int sdl_wait (SDLAudioState *s, const char *forfn)
102 if (SDL_SemWait (s->sem)) {
103 sdl_logerr ("SDL_SemWait for %s failed\n", forfn);
109 static int sdl_unlock_and_post (SDLAudioState *s, const char *forfn)
111 if (sdl_unlock (s, forfn)) {
115 return sdl_post (s, forfn);
118 static int aud_to_sdlfmt (audfmt_e fmt)
134 dolog ("Internal logic error: Bad audio format %d\n", fmt);
142 static int sdl_to_audfmt (int sdlfmt, audfmt_e *fmt, int *endianess)
176 dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
183 static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt)
189 /* Make sure potential threads created by SDL don't hog signals. */
191 pthread_sigmask (SIG_BLOCK, &new, &old);
194 status = SDL_OpenAudio (req, obt);
196 sdl_logerr ("SDL_OpenAudio failed\n");
200 pthread_sigmask (SIG_SETMASK, &old, NULL);
205 static void sdl_close (SDLAudioState *s)
207 if (s->initialized) {
208 sdl_lock (s, "sdl_close");
210 sdl_unlock_and_post (s, "sdl_close");
217 static void sdl_callback (void *opaque, Uint8 *buf, int len)
219 SDLVoiceOut *sdl = opaque;
220 SDLAudioState *s = &glob_sdl;
221 HWVoiceOut *hw = &sdl->hw;
222 int samples = len >> hw->info.shift;
231 /* dolog ("in callback samples=%d\n", samples); */
232 sdl_wait (s, "sdl_callback");
237 if (sdl_lock (s, "sdl_callback")) {
241 if (audio_bug (AUDIO_FUNC, sdl->live < 0 || sdl->live > hw->samples)) {
242 dolog ("sdl->live=%d hw->samples=%d\n",
243 sdl->live, hw->samples);
251 /* dolog ("in callback live=%d\n", live); */
252 to_mix = audio_MIN (samples, sdl->live);
255 int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
256 struct st_sample *src = hw->mix_buf + hw->rpos;
258 /* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
259 hw->clip (buf, src, chunk);
260 sdl->rpos = (sdl->rpos + chunk) % hw->samples;
262 buf += chunk << hw->info.shift;
269 if (sdl_unlock (s, "sdl_callback")) {
273 /* dolog ("done len=%d\n", len); */
276 static int sdl_write_out (SWVoiceOut *sw, void *buf, int len)
278 return audio_pcm_sw_write (sw, buf, len);
281 static int sdl_run_out (HWVoiceOut *hw, int live)
284 SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
285 SDLAudioState *s = &glob_sdl;
287 if (sdl_lock (s, "sdl_run_out")) {
291 if (sdl->decr > live) {
292 ldebug ("sdl->decr %d live %d sdl->live %d\n",
298 decr = audio_MIN (sdl->decr, live);
301 sdl->live = live - decr;
302 hw->rpos = sdl->rpos;
305 sdl_unlock_and_post (s, "sdl_run_out");
308 sdl_unlock (s, "sdl_run_out");
313 static void sdl_fini_out (HWVoiceOut *hw)
317 sdl_close (&glob_sdl);
320 static int sdl_init_out (HWVoiceOut *hw, struct audsettings *as)
322 SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
323 SDLAudioState *s = &glob_sdl;
324 SDL_AudioSpec req, obt;
327 audfmt_e effective_fmt;
328 struct audsettings obt_as;
331 req.format = aud_to_sdlfmt (as->fmt);
332 req.channels = as->nchannels;
333 req.samples = conf.nb_samples;
334 req.callback = sdl_callback;
337 if (sdl_open (&req, &obt)) {
341 err = sdl_to_audfmt (obt.format, &effective_fmt, &endianess);
347 obt_as.freq = obt.freq;
348 obt_as.nchannels = obt.channels;
349 obt_as.fmt = effective_fmt;
350 obt_as.endianness = endianess;
352 audio_pcm_init_info (&hw->info, &obt_as);
353 hw->samples = obt.samples;
361 static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...)
377 static void *sdl_audio_init (void)
379 SDLAudioState *s = &glob_sdl;
381 if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
382 sdl_logerr ("SDL failed to initialize audio subsystem\n");
386 s->mutex = SDL_CreateMutex ();
388 sdl_logerr ("Failed to create SDL mutex\n");
389 SDL_QuitSubSystem (SDL_INIT_AUDIO);
393 s->sem = SDL_CreateSemaphore (0);
395 sdl_logerr ("Failed to create SDL semaphore\n");
396 SDL_DestroyMutex (s->mutex);
397 SDL_QuitSubSystem (SDL_INIT_AUDIO);
404 static void sdl_audio_fini (void *opaque)
406 SDLAudioState *s = opaque;
408 SDL_DestroySemaphore (s->sem);
409 SDL_DestroyMutex (s->mutex);
410 SDL_QuitSubSystem (SDL_INIT_AUDIO);
413 static struct audio_option sdl_options[] = {
417 .valp = &conf.nb_samples,
418 .descr = "Size of SDL buffer in samples"
420 { /* End of list */ }
423 static struct audio_pcm_ops sdl_pcm_ops = {
424 .init_out = sdl_init_out,
425 .fini_out = sdl_fini_out,
426 .run_out = sdl_run_out,
427 .write = sdl_write_out,
428 .ctl_out = sdl_ctl_out,
431 struct audio_driver sdl_audio_driver = {
433 .descr = "SDL http://www.libsdl.org",
434 .options = sdl_options,
435 .init = sdl_audio_init,
436 .fini = sdl_audio_fini,
437 .pcm_ops = &sdl_pcm_ops,
441 .voice_size_out = sizeof (SDLVoiceOut),