2 * QEMU SDL audio output driver
4 * Copyright (c) 2004 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 #include "audio/audio_int.h"
30 typedef struct SDLVoice {
34 #define dolog(...) AUD_log ("sdl", __VA_ARGS__)
36 #define ldebug(...) dolog (__VA_ARGS__)
41 #define QC_SDL_SAMPLES "QEMU_SDL_SAMPLES"
43 #define errstr() SDL_GetError ()
51 struct SDLAudioState {
57 typedef struct SDLAudioState SDLAudioState;
59 static void sdl_hw_run (HWVoice *hw)
64 static int sdl_lock (SDLAudioState *s)
66 if (SDL_LockMutex (s->mutex)) {
67 dolog ("SDL_LockMutex failed\nReason: %s\n", errstr ());
73 static int sdl_unlock (SDLAudioState *s)
75 if (SDL_UnlockMutex (s->mutex)) {
76 dolog ("SDL_UnlockMutex failed\nReason: %s\n", errstr ());
82 static int sdl_post (SDLAudioState *s)
84 if (SDL_SemPost (s->sem)) {
85 dolog ("SDL_SemPost failed\nReason: %s\n", errstr ());
91 static int sdl_wait (SDLAudioState *s)
93 if (SDL_SemWait (s->sem)) {
94 dolog ("SDL_SemWait failed\nReason: %s\n", errstr ());
100 static int sdl_unlock_and_post (SDLAudioState *s)
108 static int sdl_hw_write (SWVoice *sw, void *buf, int len)
111 SDLAudioState *s = &glob_sdl;
113 ret = pcm_hw_write (sw, buf, len);
114 sdl_unlock_and_post (s);
118 static int AUD_to_sdlfmt (audfmt_e fmt, int *shift)
122 case AUD_FMT_S8: return AUDIO_S8;
123 case AUD_FMT_U8: return AUDIO_U8;
124 case AUD_FMT_S16: *shift = 1; return AUDIO_S16LSB;
125 case AUD_FMT_U16: *shift = 1; return AUDIO_U16LSB;
127 dolog ("Internal logic error: Bad audio format %d\nAborting\n", fmt);
132 static int sdl_to_audfmt (int fmt)
135 case AUDIO_S8: return AUD_FMT_S8;
136 case AUDIO_U8: return AUD_FMT_U8;
137 case AUDIO_S16LSB: return AUD_FMT_S16;
138 case AUDIO_U16LSB: return AUD_FMT_U16;
140 dolog ("Internal logic error: Unrecognized SDL audio format %d\n"
146 static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt)
150 status = SDL_OpenAudio (req, obt);
152 dolog ("SDL_OpenAudio failed\nReason: %s\n", errstr ());
157 static void sdl_close (SDLAudioState *s)
159 if (s->initialized) {
162 sdl_unlock_and_post (s);
169 static void sdl_callback (void *opaque, Uint8 *buf, int len)
171 SDLVoice *sdl = opaque;
172 SDLAudioState *s = &glob_sdl;
173 HWVoice *hw = &sdl->hw;
174 int samples = len >> hw->shift;
181 int to_mix, live, decr;
183 /* dolog ("in callback samples=%d\n", samples); */
190 live = pcm_hw_get_live (hw);
194 /* dolog ("in callback live=%d\n", live); */
195 to_mix = audio_MIN (samples, live);
198 int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
199 st_sample_t *src = hw->mix_buf + hw->rpos;
201 /* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
202 hw->clip (buf, src, chunk);
203 memset (src, 0, chunk * sizeof (st_sample_t));
204 hw->rpos = (hw->rpos + chunk) % hw->samples;
206 buf += chunk << hw->shift;
209 pcm_hw_dec_live (hw, decr);
214 /* dolog ("done len=%d\n", len); */
217 static void sdl_hw_fini (HWVoice *hw)
219 ldebug ("sdl_hw_fini %d fixed=%d\n",
220 glob_sdl.initialized, audio_state.fixed_format);
221 sdl_close (&glob_sdl);
224 static int sdl_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
226 SDLVoice *sdl = (SDLVoice *) hw;
227 SDLAudioState *s = &glob_sdl;
228 SDL_AudioSpec req, obt;
231 ldebug ("sdl_hw_init %d freq=%d fixed=%d\n",
232 s->initialized, freq, audio_state.fixed_format);
234 if (nchannels != 2) {
235 dolog ("Bogus channel count %d\n", nchannels);
240 req.format = AUD_to_sdlfmt (fmt, &shift);
241 req.channels = nchannels;
242 req.samples = conf.nb_samples;
243 shift <<= nchannels == 2;
245 req.callback = sdl_callback;
248 if (sdl_open (&req, &obt))
252 hw->fmt = sdl_to_audfmt (obt.format);
253 hw->nchannels = obt.channels;
254 hw->bufsize = obt.samples << shift;
262 static int sdl_hw_ctl (HWVoice *hw, int cmd, ...)
278 static void *sdl_audio_init (void)
280 SDLAudioState *s = &glob_sdl;
281 conf.nb_samples = audio_get_conf_int (QC_SDL_SAMPLES, conf.nb_samples);
283 if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
284 dolog ("SDL failed to initialize audio subsystem\nReason: %s\n",
289 s->mutex = SDL_CreateMutex ();
291 dolog ("Failed to create SDL mutex\nReason: %s\n", errstr ());
292 SDL_QuitSubSystem (SDL_INIT_AUDIO);
296 s->sem = SDL_CreateSemaphore (0);
298 dolog ("Failed to create SDL semaphore\nReason: %s\n", errstr ());
299 SDL_DestroyMutex (s->mutex);
300 SDL_QuitSubSystem (SDL_INIT_AUDIO);
307 static void sdl_audio_fini (void *opaque)
309 SDLAudioState *s = opaque;
311 SDL_DestroySemaphore (s->sem);
312 SDL_DestroyMutex (s->mutex);
313 SDL_QuitSubSystem (SDL_INIT_AUDIO);
316 struct pcm_ops sdl_pcm_ops = {
324 struct audio_output_driver sdl_output_driver = {