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, int *shift)
138 dolog ("Internal logic error: Bad audio format %d\n", fmt);
146 static int sdl_to_audfmt (int sdlfmt, audfmt_e *fmt, int *endianess)
180 dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
187 static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt)
193 /* Make sure potential threads created by SDL don't hog signals. */
195 pthread_sigmask (SIG_BLOCK, &new, &old);
198 status = SDL_OpenAudio (req, obt);
200 sdl_logerr ("SDL_OpenAudio failed\n");
204 pthread_sigmask (SIG_SETMASK, &old, NULL);
209 static void sdl_close (SDLAudioState *s)
211 if (s->initialized) {
212 sdl_lock (s, "sdl_close");
214 sdl_unlock_and_post (s, "sdl_close");
221 static void sdl_callback (void *opaque, Uint8 *buf, int len)
223 SDLVoiceOut *sdl = opaque;
224 SDLAudioState *s = &glob_sdl;
225 HWVoiceOut *hw = &sdl->hw;
226 int samples = len >> hw->info.shift;
235 /* dolog ("in callback samples=%d\n", samples); */
236 sdl_wait (s, "sdl_callback");
241 if (sdl_lock (s, "sdl_callback")) {
245 if (audio_bug (AUDIO_FUNC, sdl->live < 0 || sdl->live > hw->samples)) {
246 dolog ("sdl->live=%d hw->samples=%d\n",
247 sdl->live, hw->samples);
255 /* dolog ("in callback live=%d\n", live); */
256 to_mix = audio_MIN (samples, sdl->live);
259 int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
260 struct st_sample *src = hw->mix_buf + hw->rpos;
262 /* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
263 hw->clip (buf, src, chunk);
264 sdl->rpos = (sdl->rpos + chunk) % hw->samples;
266 buf += chunk << hw->info.shift;
273 if (sdl_unlock (s, "sdl_callback")) {
277 /* dolog ("done len=%d\n", len); */
280 static int sdl_write_out (SWVoiceOut *sw, void *buf, int len)
282 return audio_pcm_sw_write (sw, buf, len);
285 static int sdl_run_out (HWVoiceOut *hw)
288 SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
289 SDLAudioState *s = &glob_sdl;
291 if (sdl_lock (s, "sdl_run_out")) {
295 live = audio_pcm_hw_get_live_out (hw);
297 if (sdl->decr > live) {
298 ldebug ("sdl->decr %d live %d sdl->live %d\n",
304 decr = audio_MIN (sdl->decr, live);
307 sdl->live = live - decr;
308 hw->rpos = sdl->rpos;
311 sdl_unlock_and_post (s, "sdl_run_out");
314 sdl_unlock (s, "sdl_run_out");
319 static void sdl_fini_out (HWVoiceOut *hw)
323 sdl_close (&glob_sdl);
326 static int sdl_init_out (HWVoiceOut *hw, struct audsettings *as)
328 SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
329 SDLAudioState *s = &glob_sdl;
330 SDL_AudioSpec req, obt;
334 audfmt_e effective_fmt;
335 struct audsettings obt_as;
337 shift <<= as->nchannels == 2;
340 req.format = aud_to_sdlfmt (as->fmt, &shift);
341 req.channels = as->nchannels;
342 req.samples = conf.nb_samples;
343 req.callback = sdl_callback;
346 if (sdl_open (&req, &obt)) {
350 err = sdl_to_audfmt (obt.format, &effective_fmt, &endianess);
356 obt_as.freq = obt.freq;
357 obt_as.nchannels = obt.channels;
358 obt_as.fmt = effective_fmt;
359 obt_as.endianness = endianess;
361 audio_pcm_init_info (&hw->info, &obt_as);
362 hw->samples = obt.samples;
370 static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...)
386 static void *sdl_audio_init (void)
388 SDLAudioState *s = &glob_sdl;
390 if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
391 sdl_logerr ("SDL failed to initialize audio subsystem\n");
395 s->mutex = SDL_CreateMutex ();
397 sdl_logerr ("Failed to create SDL mutex\n");
398 SDL_QuitSubSystem (SDL_INIT_AUDIO);
402 s->sem = SDL_CreateSemaphore (0);
404 sdl_logerr ("Failed to create SDL semaphore\n");
405 SDL_DestroyMutex (s->mutex);
406 SDL_QuitSubSystem (SDL_INIT_AUDIO);
413 static void sdl_audio_fini (void *opaque)
415 SDLAudioState *s = opaque;
417 SDL_DestroySemaphore (s->sem);
418 SDL_DestroyMutex (s->mutex);
419 SDL_QuitSubSystem (SDL_INIT_AUDIO);
422 static struct audio_option sdl_options[] = {
426 .valp = &conf.nb_samples,
427 .descr = "Size of SDL buffer in samples"
429 { /* End of list */ }
432 static struct audio_pcm_ops sdl_pcm_ops = {
433 .init_out = sdl_init_out,
434 .fini_out = sdl_fini_out,
435 .run_out = sdl_run_out,
436 .write = sdl_write_out,
437 .ctl_out = sdl_ctl_out,
440 struct audio_driver sdl_audio_driver = {
442 .descr = "SDL http://www.libsdl.org",
443 .options = sdl_options,
444 .init = sdl_audio_init,
445 .fini = sdl_audio_fini,
446 .pcm_ops = &sdl_pcm_ops,
450 .voice_size_out = sizeof (SDLVoiceOut),