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>
28 #define AUDIO_CAP "sdl"
29 #include "audio_int.h"
31 typedef struct SDLVoiceOut {
44 struct SDLAudioState {
50 typedef struct SDLAudioState SDLAudioState;
52 static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...)
57 AUD_vlog (AUDIO_CAP, fmt, ap);
60 AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
63 static int sdl_lock (SDLAudioState *s, const char *forfn)
65 if (SDL_LockMutex (s->mutex)) {
66 sdl_logerr ("SDL_LockMutex for %s failed\n", forfn);
72 static int sdl_unlock (SDLAudioState *s, const char *forfn)
74 if (SDL_UnlockMutex (s->mutex)) {
75 sdl_logerr ("SDL_UnlockMutex for %s failed\n", forfn);
81 static int sdl_post (SDLAudioState *s, const char *forfn)
83 if (SDL_SemPost (s->sem)) {
84 sdl_logerr ("SDL_SemPost for %s failed\n", forfn);
90 static int sdl_wait (SDLAudioState *s, const char *forfn)
92 if (SDL_SemWait (s->sem)) {
93 sdl_logerr ("SDL_SemWait for %s failed\n", forfn);
99 static int sdl_unlock_and_post (SDLAudioState *s, const char *forfn)
101 if (sdl_unlock (s, forfn)) {
105 return sdl_post (s, forfn);
108 static int aud_to_sdlfmt (audfmt_e fmt, int *shift)
128 dolog ("Internal logic error: Bad audio format %d\n", fmt);
136 static int sdl_to_audfmt (int sdlfmt, audfmt_e *fmt, int *endianess)
170 dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
177 static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt)
181 status = SDL_OpenAudio (req, obt);
183 sdl_logerr ("SDL_OpenAudio failed\n");
188 static void sdl_close (SDLAudioState *s)
190 if (s->initialized) {
191 sdl_lock (s, "sdl_close");
193 sdl_unlock_and_post (s, "sdl_close");
200 static void sdl_callback (void *opaque, Uint8 *buf, int len)
202 SDLVoiceOut *sdl = opaque;
203 SDLAudioState *s = &glob_sdl;
204 HWVoiceOut *hw = &sdl->hw;
205 int samples = len >> hw->info.shift;
214 /* dolog ("in callback samples=%d\n", samples); */
215 sdl_wait (s, "sdl_callback");
220 if (sdl_lock (s, "sdl_callback")) {
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);
234 /* dolog ("in callback live=%d\n", live); */
235 to_mix = audio_MIN (samples, sdl->live);
238 int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
239 st_sample_t *src = hw->mix_buf + hw->rpos;
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;
245 buf += chunk << hw->info.shift;
252 if (sdl_unlock (s, "sdl_callback")) {
256 /* dolog ("done len=%d\n", len); */
259 static int sdl_write_out (SWVoiceOut *sw, void *buf, int len)
261 return audio_pcm_sw_write (sw, buf, len);
264 static int sdl_run_out (HWVoiceOut *hw)
267 SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
268 SDLAudioState *s = &glob_sdl;
270 if (sdl_lock (s, "sdl_callback")) {
274 live = audio_pcm_hw_get_live_out (hw);
276 if (sdl->decr > live) {
277 ldebug ("sdl->decr %d live %d sdl->live %d\n",
283 decr = audio_MIN (sdl->decr, live);
286 sdl->live = live - decr;
287 hw->rpos = sdl->rpos;
290 sdl_unlock_and_post (s, "sdl_callback");
293 sdl_unlock (s, "sdl_callback");
298 static void sdl_fini_out (HWVoiceOut *hw)
302 sdl_close (&glob_sdl);
305 static int sdl_init_out (HWVoiceOut *hw, audsettings_t *as)
307 SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
308 SDLAudioState *s = &glob_sdl;
309 SDL_AudioSpec req, obt;
313 audfmt_e effective_fmt;
314 audsettings_t obt_as;
316 shift <<= as->nchannels == 2;
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;
325 if (sdl_open (&req, &obt)) {
329 err = sdl_to_audfmt (obt.format, &effective_fmt, &endianess);
335 obt_as.freq = obt.freq;
336 obt_as.nchannels = obt.channels;
337 obt_as.fmt = effective_fmt;
339 audio_pcm_init_info (
342 audio_need_to_swap_endian (endianess)
344 hw->samples = obt.samples;
352 static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...)
368 static void *sdl_audio_init (void)
370 SDLAudioState *s = &glob_sdl;
372 if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
373 sdl_logerr ("SDL failed to initialize audio subsystem\n");
377 s->mutex = SDL_CreateMutex ();
379 sdl_logerr ("Failed to create SDL mutex\n");
380 SDL_QuitSubSystem (SDL_INIT_AUDIO);
384 s->sem = SDL_CreateSemaphore (0);
386 sdl_logerr ("Failed to create SDL semaphore\n");
387 SDL_DestroyMutex (s->mutex);
388 SDL_QuitSubSystem (SDL_INIT_AUDIO);
395 static void sdl_audio_fini (void *opaque)
397 SDLAudioState *s = opaque;
399 SDL_DestroySemaphore (s->sem);
400 SDL_DestroyMutex (s->mutex);
401 SDL_QuitSubSystem (SDL_INIT_AUDIO);
404 static struct audio_option sdl_options[] = {
405 {"SAMPLES", AUD_OPT_INT, &conf.nb_samples,
406 "Size of SDL buffer in samples", NULL, 0},
407 {NULL, 0, NULL, NULL, NULL, 0}
410 static struct audio_pcm_ops sdl_pcm_ops = {
424 struct audio_driver sdl_audio_driver = {
425 INIT_FIELD (name = ) "sdl",
426 INIT_FIELD (descr = ) "SDL http://www.libsdl.org",
427 INIT_FIELD (options = ) sdl_options,
428 INIT_FIELD (init = ) sdl_audio_init,
429 INIT_FIELD (fini = ) sdl_audio_fini,
430 INIT_FIELD (pcm_ops = ) &sdl_pcm_ops,
431 INIT_FIELD (can_be_default = ) 1,
432 INIT_FIELD (max_voices_out = ) 1,
433 INIT_FIELD (max_voices_in = ) 0,
434 INIT_FIELD (voice_size_out = ) sizeof (SDLVoiceOut),
435 INIT_FIELD (voice_size_in = ) 0