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 "qemu/osdep.h"
27 #include <SDL_thread.h>
28 #include "qemu/module.h"
29 #include "qapi/error.h"
34 #define _POSIX_PTHREAD_SEMANTICS 1
35 #elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
40 #define AUDIO_CAP "sdl"
41 #include "audio_int.h"
43 typedef struct SDLVoiceOut {
48 SDL_AudioDeviceID devid;
51 typedef struct SDLVoiceIn {
56 SDL_AudioDeviceID devid;
59 static void G_GNUC_PRINTF (1, 2) sdl_logerr (const char *fmt, ...)
64 AUD_vlog (AUDIO_CAP, fmt, ap);
67 AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
70 static int aud_to_sdlfmt (AudioFormat fmt)
79 case AUDIO_FORMAT_S16:
82 case AUDIO_FORMAT_U16:
85 case AUDIO_FORMAT_S32:
88 /* no unsigned 32-bit support in SDL */
90 case AUDIO_FORMAT_F32:
94 dolog ("Internal logic error: Bad audio format %d\n", fmt);
102 static int sdl_to_audfmt(int sdlfmt, AudioFormat *fmt, int *endianness)
107 *fmt = AUDIO_FORMAT_S8;
112 *fmt = AUDIO_FORMAT_U8;
117 *fmt = AUDIO_FORMAT_S16;
122 *fmt = AUDIO_FORMAT_U16;
127 *fmt = AUDIO_FORMAT_S16;
132 *fmt = AUDIO_FORMAT_U16;
137 *fmt = AUDIO_FORMAT_S32;
142 *fmt = AUDIO_FORMAT_S32;
147 *fmt = AUDIO_FORMAT_F32;
152 *fmt = AUDIO_FORMAT_F32;
156 dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
163 static SDL_AudioDeviceID sdl_open(SDL_AudioSpec *req, SDL_AudioSpec *obt,
166 SDL_AudioDeviceID devid;
171 /* Make sure potential threads created by SDL don't hog signals. */
172 err = sigfillset (&new);
174 dolog ("sdl_open: sigfillset failed: %s\n", strerror (errno));
177 err = pthread_sigmask (SIG_BLOCK, &new, &old);
179 dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err));
184 devid = SDL_OpenAudioDevice(NULL, rec, req, obt, 0);
186 sdl_logerr("SDL_OpenAudioDevice for %s failed\n",
187 rec ? "recording" : "playback");
191 err = pthread_sigmask (SIG_SETMASK, &old, NULL);
193 dolog ("sdl_open: pthread_sigmask (restore) failed: %s\n",
195 /* We have failed to restore original signal mask, all bets are off,
196 so exit the process */
203 static void sdl_close_out(SDLVoiceOut *sdl)
205 if (sdl->initialized) {
206 SDL_LockAudioDevice(sdl->devid);
208 SDL_UnlockAudioDevice(sdl->devid);
209 SDL_PauseAudioDevice(sdl->devid, 1);
210 sdl->initialized = 0;
213 SDL_CloseAudioDevice(sdl->devid);
218 static void sdl_callback_out(void *opaque, Uint8 *buf, int len)
220 SDLVoiceOut *sdl = opaque;
221 HWVoiceOut *hw = &sdl->hw;
225 /* dolog("callback_out: len=%d avail=%zu\n", len, hw->pending_emul); */
227 while (hw->pending_emul && len) {
228 size_t write_len, start;
230 start = audio_ring_posb(hw->pos_emul, hw->pending_emul,
232 assert(start < hw->size_emul);
234 write_len = MIN(MIN(hw->pending_emul, len),
235 hw->size_emul - start);
237 memcpy(buf, hw->buf_emul + start, write_len);
238 hw->pending_emul -= write_len;
244 /* clear remaining buffer that we couldn't fill with data */
246 audio_pcm_info_clear_buf(&hw->info, buf,
247 len / hw->info.bytes_per_frame);
251 static void sdl_close_in(SDLVoiceIn *sdl)
253 if (sdl->initialized) {
254 SDL_LockAudioDevice(sdl->devid);
256 SDL_UnlockAudioDevice(sdl->devid);
257 SDL_PauseAudioDevice(sdl->devid, 1);
258 sdl->initialized = 0;
261 SDL_CloseAudioDevice(sdl->devid);
266 static void sdl_callback_in(void *opaque, Uint8 *buf, int len)
268 SDLVoiceIn *sdl = opaque;
269 HWVoiceIn *hw = &sdl->hw;
275 /* dolog("callback_in: len=%d pending=%zu\n", len, hw->pending_emul); */
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));
281 memcpy(hw->buf_emul + hw->pos_emul, buf, read_len);
283 hw->pending_emul += read_len;
284 hw->pos_emul = (hw->pos_emul + read_len) % hw->size_emul;
290 #define SDL_WRAPPER_FUNC(name, ret_type, args_decl, args, dir) \
291 static ret_type glue(sdl_, name)args_decl \
294 glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw; \
296 SDL_LockAudioDevice(sdl->devid); \
297 ret = glue(audio_generic_, name)args; \
298 SDL_UnlockAudioDevice(sdl->devid); \
303 #define SDL_WRAPPER_VOID_FUNC(name, args_decl, args, dir) \
304 static void glue(sdl_, name)args_decl \
306 glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw; \
308 SDL_LockAudioDevice(sdl->devid); \
309 glue(audio_generic_, name)args; \
310 SDL_UnlockAudioDevice(sdl->devid); \
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),
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),
322 SDL_WRAPPER_FUNC(get_buffer_in, void *, (HWVoiceIn *hw, size_t *size),
324 SDL_WRAPPER_VOID_FUNC(put_buffer_in, (HWVoiceIn *hw, void *buf, size_t size),
326 #undef SDL_WRAPPER_FUNC
327 #undef SDL_WRAPPER_VOID_FUNC
329 static void sdl_fini_out(HWVoiceOut *hw)
331 SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
336 static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as,
339 SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
340 SDL_AudioSpec req, obt;
343 AudioFormat effective_fmt;
344 Audiodev *dev = drv_opaque;
345 AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.out;
346 struct audsettings obt_as;
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;
358 sdl->devid = sdl_open(&req, &obt, 0);
363 err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness);
369 obt_as.freq = obt.freq;
370 obt_as.nchannels = obt.channels;
371 obt_as.fmt = effective_fmt;
372 obt_as.endianness = endianness;
374 audio_pcm_init_info (&hw->info, &obt_as);
375 hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) *
378 sdl->initialized = 1;
383 static void sdl_enable_out(HWVoiceOut *hw, bool enable)
385 SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
387 SDL_PauseAudioDevice(sdl->devid, !enable);
390 static void sdl_fini_in(HWVoiceIn *hw)
392 SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
397 static int sdl_init_in(HWVoiceIn *hw, audsettings *as, void *drv_opaque)
399 SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
400 SDL_AudioSpec req, obt;
403 AudioFormat effective_fmt;
404 Audiodev *dev = drv_opaque;
405 AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.in;
406 struct audsettings obt_as;
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;
418 sdl->devid = sdl_open(&req, &obt, 1);
423 err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness);
429 obt_as.freq = obt.freq;
430 obt_as.nchannels = obt.channels;
431 obt_as.fmt = effective_fmt;
432 obt_as.endianness = endianness;
434 audio_pcm_init_info(&hw->info, &obt_as);
435 hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) *
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;
441 sdl->initialized = 1;
446 static void sdl_enable_in(HWVoiceIn *hw, bool enable)
448 SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
450 SDL_PauseAudioDevice(sdl->devid, !enable);
453 static void *sdl_audio_init(Audiodev *dev, Error **errp)
455 if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
456 error_setg(errp, "SDL failed to initialize audio subsystem");
463 static void sdl_audio_fini (void *opaque)
465 SDL_QuitSubSystem (SDL_INIT_AUDIO);
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 */
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 */
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,
491 static struct audio_driver sdl_audio_driver = {
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),
503 static void register_audio_sdl(void)
505 audio_driver_register(&sdl_audio_driver);
507 type_init(register_audio_sdl);