xref: /openbmc/qemu/audio/sdlaudio.c (revision 7d87775f)
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 
25 #include "qemu/osdep.h"
26 #include <SDL.h>
27 #include <SDL_thread.h>
28 #include "qemu/module.h"
29 #include "qapi/error.h"
30 #include "audio.h"
31 
32 #ifndef _WIN32
33 #ifdef __sun__
34 #define _POSIX_PTHREAD_SEMANTICS 1
35 #elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
36 #include <pthread.h>
37 #endif
38 #endif
39 
40 #define AUDIO_CAP "sdl"
41 #include "audio_int.h"
42 
43 typedef struct SDLVoiceOut {
44     HWVoiceOut hw;
45     int exit;
46     int initialized;
47     Audiodev *dev;
48     SDL_AudioDeviceID devid;
49 } SDLVoiceOut;
50 
51 typedef struct SDLVoiceIn {
52     HWVoiceIn hw;
53     int exit;
54     int initialized;
55     Audiodev *dev;
56     SDL_AudioDeviceID devid;
57 } SDLVoiceIn;
58 
59 static void G_GNUC_PRINTF (1, 2) sdl_logerr (const char *fmt, ...)
60 {
61     va_list ap;
62 
63     va_start (ap, fmt);
64     AUD_vlog (AUDIO_CAP, fmt, ap);
65     va_end (ap);
66 
67     AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
68 }
69 
70 static int aud_to_sdlfmt (AudioFormat fmt)
71 {
72     switch (fmt) {
73     case AUDIO_FORMAT_S8:
74         return AUDIO_S8;
75 
76     case AUDIO_FORMAT_U8:
77         return AUDIO_U8;
78 
79     case AUDIO_FORMAT_S16:
80         return AUDIO_S16LSB;
81 
82     case AUDIO_FORMAT_U16:
83         return AUDIO_U16LSB;
84 
85     case AUDIO_FORMAT_S32:
86         return AUDIO_S32LSB;
87 
88     /* no unsigned 32-bit support in SDL */
89 
90     case AUDIO_FORMAT_F32:
91         return AUDIO_F32LSB;
92 
93     default:
94         dolog ("Internal logic error: Bad audio format %d\n", fmt);
95 #ifdef DEBUG_AUDIO
96         abort ();
97 #endif
98         return AUDIO_U8;
99     }
100 }
101 
102 static int sdl_to_audfmt(int sdlfmt, AudioFormat *fmt, int *endianness)
103 {
104     switch (sdlfmt) {
105     case AUDIO_S8:
106         *endianness = 0;
107         *fmt = AUDIO_FORMAT_S8;
108         break;
109 
110     case AUDIO_U8:
111         *endianness = 0;
112         *fmt = AUDIO_FORMAT_U8;
113         break;
114 
115     case AUDIO_S16LSB:
116         *endianness = 0;
117         *fmt = AUDIO_FORMAT_S16;
118         break;
119 
120     case AUDIO_U16LSB:
121         *endianness = 0;
122         *fmt = AUDIO_FORMAT_U16;
123         break;
124 
125     case AUDIO_S16MSB:
126         *endianness = 1;
127         *fmt = AUDIO_FORMAT_S16;
128         break;
129 
130     case AUDIO_U16MSB:
131         *endianness = 1;
132         *fmt = AUDIO_FORMAT_U16;
133         break;
134 
135     case AUDIO_S32LSB:
136         *endianness = 0;
137         *fmt = AUDIO_FORMAT_S32;
138         break;
139 
140     case AUDIO_S32MSB:
141         *endianness = 1;
142         *fmt = AUDIO_FORMAT_S32;
143         break;
144 
145     case AUDIO_F32LSB:
146         *endianness = 0;
147         *fmt = AUDIO_FORMAT_F32;
148         break;
149 
150     case AUDIO_F32MSB:
151         *endianness = 1;
152         *fmt = AUDIO_FORMAT_F32;
153         break;
154 
155     default:
156         dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
157         return -1;
158     }
159 
160     return 0;
161 }
162 
163 static SDL_AudioDeviceID sdl_open(SDL_AudioSpec *req, SDL_AudioSpec *obt,
164                                   int rec)
165 {
166     SDL_AudioDeviceID devid;
167 #ifndef _WIN32
168     int err;
169     sigset_t new, old;
170 
171     /* Make sure potential threads created by SDL don't hog signals.  */
172     err = sigfillset (&new);
173     if (err) {
174         dolog ("sdl_open: sigfillset failed: %s\n", strerror (errno));
175         return 0;
176     }
177     err = pthread_sigmask (SIG_BLOCK, &new, &old);
178     if (err) {
179         dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err));
180         return 0;
181     }
182 #endif
183 
184     devid = SDL_OpenAudioDevice(NULL, rec, req, obt, 0);
185     if (!devid) {
186         sdl_logerr("SDL_OpenAudioDevice for %s failed\n",
187                    rec ? "recording" : "playback");
188     }
189 
190 #ifndef _WIN32
191     err = pthread_sigmask (SIG_SETMASK, &old, NULL);
192     if (err) {
193         dolog ("sdl_open: pthread_sigmask (restore) failed: %s\n",
194                strerror (errno));
195         /* We have failed to restore original signal mask, all bets are off,
196            so exit the process */
197         exit (EXIT_FAILURE);
198     }
199 #endif
200     return devid;
201 }
202 
203 static void sdl_close_out(SDLVoiceOut *sdl)
204 {
205     if (sdl->initialized) {
206         SDL_LockAudioDevice(sdl->devid);
207         sdl->exit = 1;
208         SDL_UnlockAudioDevice(sdl->devid);
209         SDL_PauseAudioDevice(sdl->devid, 1);
210         sdl->initialized = 0;
211     }
212     if (sdl->devid) {
213         SDL_CloseAudioDevice(sdl->devid);
214         sdl->devid = 0;
215     }
216 }
217 
218 static void sdl_callback_out(void *opaque, Uint8 *buf, int len)
219 {
220     SDLVoiceOut *sdl = opaque;
221     HWVoiceOut *hw = &sdl->hw;
222 
223     if (!sdl->exit) {
224 
225         /* dolog("callback_out: len=%d avail=%zu\n", len, hw->pending_emul); */
226 
227         while (hw->pending_emul && len) {
228             size_t write_len, start;
229 
230             start = audio_ring_posb(hw->pos_emul, hw->pending_emul,
231                                     hw->size_emul);
232             assert(start < hw->size_emul);
233 
234             write_len = MIN(MIN(hw->pending_emul, len),
235                             hw->size_emul - start);
236 
237             memcpy(buf, hw->buf_emul + start, write_len);
238             hw->pending_emul -= write_len;
239             len -= write_len;
240             buf += write_len;
241         }
242     }
243 
244     /* clear remaining buffer that we couldn't fill with data */
245     if (len) {
246         audio_pcm_info_clear_buf(&hw->info, buf,
247                                  len / hw->info.bytes_per_frame);
248     }
249 }
250 
251 static void sdl_close_in(SDLVoiceIn *sdl)
252 {
253     if (sdl->initialized) {
254         SDL_LockAudioDevice(sdl->devid);
255         sdl->exit = 1;
256         SDL_UnlockAudioDevice(sdl->devid);
257         SDL_PauseAudioDevice(sdl->devid, 1);
258         sdl->initialized = 0;
259     }
260     if (sdl->devid) {
261         SDL_CloseAudioDevice(sdl->devid);
262         sdl->devid = 0;
263     }
264 }
265 
266 static void sdl_callback_in(void *opaque, Uint8 *buf, int len)
267 {
268     SDLVoiceIn *sdl = opaque;
269     HWVoiceIn *hw = &sdl->hw;
270 
271     if (sdl->exit) {
272         return;
273     }
274 
275     /* dolog("callback_in: len=%d pending=%zu\n", len, hw->pending_emul); */
276 
277     while (hw->pending_emul < hw->size_emul && len) {
278         size_t read_len = MIN(len, MIN(hw->size_emul - hw->pos_emul,
279                                        hw->size_emul - hw->pending_emul));
280 
281         memcpy(hw->buf_emul + hw->pos_emul, buf, read_len);
282 
283         hw->pending_emul += read_len;
284         hw->pos_emul = (hw->pos_emul + read_len) % hw->size_emul;
285         len -= read_len;
286         buf += read_len;
287     }
288 }
289 
290 #define SDL_WRAPPER_FUNC(name, ret_type, args_decl, args, dir) \
291     static ret_type glue(sdl_, name)args_decl                  \
292     {                                                          \
293         ret_type ret;                                          \
294         glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw;  \
295                                                                \
296         SDL_LockAudioDevice(sdl->devid);                       \
297         ret = glue(audio_generic_, name)args;                  \
298         SDL_UnlockAudioDevice(sdl->devid);                     \
299                                                                \
300         return ret;                                            \
301     }
302 
303 #define SDL_WRAPPER_VOID_FUNC(name, args_decl, args, dir)      \
304     static void glue(sdl_, name)args_decl                      \
305     {                                                          \
306         glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw;  \
307                                                                \
308         SDL_LockAudioDevice(sdl->devid);                       \
309         glue(audio_generic_, name)args;                        \
310         SDL_UnlockAudioDevice(sdl->devid);                     \
311     }
312 
313 SDL_WRAPPER_FUNC(buffer_get_free, size_t, (HWVoiceOut *hw), (hw), Out)
314 SDL_WRAPPER_FUNC(get_buffer_out, void *, (HWVoiceOut *hw, size_t *size),
315                  (hw, size), Out)
316 SDL_WRAPPER_FUNC(put_buffer_out, size_t,
317                  (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out)
318 SDL_WRAPPER_FUNC(write, size_t,
319                  (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out)
320 SDL_WRAPPER_FUNC(read, size_t, (HWVoiceIn *hw, void *buf, size_t size),
321                  (hw, buf, size), In)
322 SDL_WRAPPER_FUNC(get_buffer_in, void *, (HWVoiceIn *hw, size_t *size),
323                  (hw, size), In)
324 SDL_WRAPPER_VOID_FUNC(put_buffer_in, (HWVoiceIn *hw, void *buf, size_t size),
325                       (hw, buf, size), In)
326 #undef SDL_WRAPPER_FUNC
327 #undef SDL_WRAPPER_VOID_FUNC
328 
329 static void sdl_fini_out(HWVoiceOut *hw)
330 {
331     SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
332 
333     sdl_close_out(sdl);
334 }
335 
336 static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as,
337                         void *drv_opaque)
338 {
339     SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
340     SDL_AudioSpec req, obt;
341     int endianness;
342     int err;
343     AudioFormat effective_fmt;
344     Audiodev *dev = drv_opaque;
345     AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.out;
346     struct audsettings obt_as;
347 
348     req.freq = as->freq;
349     req.format = aud_to_sdlfmt (as->fmt);
350     req.channels = as->nchannels;
351     /* SDL samples are QEMU frames */
352     req.samples = audio_buffer_frames(
353         qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610);
354     req.callback = sdl_callback_out;
355     req.userdata = sdl;
356 
357     sdl->dev = dev;
358     sdl->devid = sdl_open(&req, &obt, 0);
359     if (!sdl->devid) {
360         return -1;
361     }
362 
363     err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness);
364     if (err) {
365         sdl_close_out(sdl);
366         return -1;
367     }
368 
369     obt_as.freq = obt.freq;
370     obt_as.nchannels = obt.channels;
371     obt_as.fmt = effective_fmt;
372     obt_as.endianness = endianness;
373 
374     audio_pcm_init_info (&hw->info, &obt_as);
375     hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) *
376         obt.samples;
377 
378     sdl->initialized = 1;
379     sdl->exit = 0;
380     return 0;
381 }
382 
383 static void sdl_enable_out(HWVoiceOut *hw, bool enable)
384 {
385     SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
386 
387     SDL_PauseAudioDevice(sdl->devid, !enable);
388 }
389 
390 static void sdl_fini_in(HWVoiceIn *hw)
391 {
392     SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
393 
394     sdl_close_in(sdl);
395 }
396 
397 static int sdl_init_in(HWVoiceIn *hw, audsettings *as, void *drv_opaque)
398 {
399     SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
400     SDL_AudioSpec req, obt;
401     int endianness;
402     int err;
403     AudioFormat effective_fmt;
404     Audiodev *dev = drv_opaque;
405     AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.in;
406     struct audsettings obt_as;
407 
408     req.freq = as->freq;
409     req.format = aud_to_sdlfmt(as->fmt);
410     req.channels = as->nchannels;
411     /* SDL samples are QEMU frames */
412     req.samples = audio_buffer_frames(
413         qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610);
414     req.callback = sdl_callback_in;
415     req.userdata = sdl;
416 
417     sdl->dev = dev;
418     sdl->devid = sdl_open(&req, &obt, 1);
419     if (!sdl->devid) {
420         return -1;
421     }
422 
423     err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness);
424     if (err) {
425         sdl_close_in(sdl);
426         return -1;
427     }
428 
429     obt_as.freq = obt.freq;
430     obt_as.nchannels = obt.channels;
431     obt_as.fmt = effective_fmt;
432     obt_as.endianness = endianness;
433 
434     audio_pcm_init_info(&hw->info, &obt_as);
435     hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) *
436         obt.samples;
437     hw->size_emul = hw->samples * hw->info.bytes_per_frame;
438     hw->buf_emul = g_malloc(hw->size_emul);
439     hw->pos_emul = hw->pending_emul = 0;
440 
441     sdl->initialized = 1;
442     sdl->exit = 0;
443     return 0;
444 }
445 
446 static void sdl_enable_in(HWVoiceIn *hw, bool enable)
447 {
448     SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
449 
450     SDL_PauseAudioDevice(sdl->devid, !enable);
451 }
452 
453 static void *sdl_audio_init(Audiodev *dev, Error **errp)
454 {
455     if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
456         error_setg(errp, "SDL failed to initialize audio subsystem");
457         return NULL;
458     }
459 
460     return dev;
461 }
462 
463 static void sdl_audio_fini (void *opaque)
464 {
465     SDL_QuitSubSystem (SDL_INIT_AUDIO);
466 }
467 
468 static struct audio_pcm_ops sdl_pcm_ops = {
469     .init_out = sdl_init_out,
470     .fini_out = sdl_fini_out,
471   /* wrapper for audio_generic_write */
472     .write    = sdl_write,
473   /* wrapper for audio_generic_buffer_get_free */
474     .buffer_get_free = sdl_buffer_get_free,
475   /* wrapper for audio_generic_get_buffer_out */
476     .get_buffer_out = sdl_get_buffer_out,
477   /* wrapper for audio_generic_put_buffer_out */
478     .put_buffer_out = sdl_put_buffer_out,
479     .enable_out = sdl_enable_out,
480     .init_in = sdl_init_in,
481     .fini_in = sdl_fini_in,
482   /* wrapper for audio_generic_read */
483     .read = sdl_read,
484   /* wrapper for audio_generic_get_buffer_in */
485     .get_buffer_in = sdl_get_buffer_in,
486   /* wrapper for audio_generic_put_buffer_in */
487     .put_buffer_in = sdl_put_buffer_in,
488     .enable_in = sdl_enable_in,
489 };
490 
491 static struct audio_driver sdl_audio_driver = {
492     .name           = "sdl",
493     .descr          = "SDL http://www.libsdl.org",
494     .init           = sdl_audio_init,
495     .fini           = sdl_audio_fini,
496     .pcm_ops        = &sdl_pcm_ops,
497     .max_voices_out = INT_MAX,
498     .max_voices_in  = INT_MAX,
499     .voice_size_out = sizeof(SDLVoiceOut),
500     .voice_size_in  = sizeof(SDLVoiceIn),
501 };
502 
503 static void register_audio_sdl(void)
504 {
505     audio_driver_register(&sdl_audio_driver);
506 }
507 type_init(register_audio_sdl);
508