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1.1 root 1: /*
2: * QEMU SDL audio output driver
3: *
4: * Copyright (c) 2004 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: #include <SDL.h>
25: #include <SDL_thread.h>
26: #include "vl.h"
27:
28: #include "audio/audio_int.h"
29:
30: typedef struct SDLVoice {
31: HWVoice hw;
32: } SDLVoice;
33:
34: #define dolog(...) AUD_log ("sdl", __VA_ARGS__)
35: #ifdef DEBUG
36: #define ldebug(...) dolog (__VA_ARGS__)
37: #else
38: #define ldebug(...)
39: #endif
40:
41: #define QC_SDL_SAMPLES "QEMU_SDL_SAMPLES"
42:
43: #define errstr() SDL_GetError ()
44:
45: static struct {
46: int nb_samples;
47: } conf = {
48: 1024
49: };
50:
51: struct SDLAudioState {
52: int exit;
53: SDL_mutex *mutex;
54: SDL_sem *sem;
55: int initialized;
56: } glob_sdl;
57: typedef struct SDLAudioState SDLAudioState;
58:
59: static void sdl_hw_run (HWVoice *hw)
60: {
61: (void) hw;
62: }
63:
64: static int sdl_lock (SDLAudioState *s)
65: {
66: if (SDL_LockMutex (s->mutex)) {
67: dolog ("SDL_LockMutex failed\nReason: %s\n", errstr ());
68: return -1;
69: }
70: return 0;
71: }
72:
73: static int sdl_unlock (SDLAudioState *s)
74: {
75: if (SDL_UnlockMutex (s->mutex)) {
76: dolog ("SDL_UnlockMutex failed\nReason: %s\n", errstr ());
77: return -1;
78: }
79: return 0;
80: }
81:
82: static int sdl_post (SDLAudioState *s)
83: {
84: if (SDL_SemPost (s->sem)) {
85: dolog ("SDL_SemPost failed\nReason: %s\n", errstr ());
86: return -1;
87: }
88: return 0;
89: }
90:
91: static int sdl_wait (SDLAudioState *s)
92: {
93: if (SDL_SemWait (s->sem)) {
94: dolog ("SDL_SemWait failed\nReason: %s\n", errstr ());
95: return -1;
96: }
97: return 0;
98: }
99:
100: static int sdl_unlock_and_post (SDLAudioState *s)
101: {
102: if (sdl_unlock (s))
103: return -1;
104:
105: return sdl_post (s);
106: }
107:
108: static int sdl_hw_write (SWVoice *sw, void *buf, int len)
109: {
110: int ret;
111: SDLAudioState *s = &glob_sdl;
112: sdl_lock (s);
113: ret = pcm_hw_write (sw, buf, len);
114: sdl_unlock_and_post (s);
115: return ret;
116: }
117:
118: static int AUD_to_sdlfmt (audfmt_e fmt, int *shift)
119: {
120: *shift = 0;
121: switch (fmt) {
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;
126: default:
127: dolog ("Internal logic error: Bad audio format %d\nAborting\n", fmt);
128: exit (EXIT_FAILURE);
129: }
130: }
131:
132: static int sdl_to_audfmt (int fmt)
133: {
134: switch (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;
139: default:
140: dolog ("Internal logic error: Unrecognized SDL audio format %d\n"
141: "Aborting\n", fmt);
142: exit (EXIT_FAILURE);
143: }
144: }
145:
146: static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt)
147: {
148: int status;
149:
150: status = SDL_OpenAudio (req, obt);
151: if (status) {
152: dolog ("SDL_OpenAudio failed\nReason: %s\n", errstr ());
153: }
154: return status;
155: }
156:
157: static void sdl_close (SDLAudioState *s)
158: {
159: if (s->initialized) {
160: sdl_lock (s);
161: s->exit = 1;
162: sdl_unlock_and_post (s);
163: SDL_PauseAudio (1);
164: SDL_CloseAudio ();
165: s->initialized = 0;
166: }
167: }
168:
169: static void sdl_callback (void *opaque, Uint8 *buf, int len)
170: {
171: SDLVoice *sdl = opaque;
172: SDLAudioState *s = &glob_sdl;
173: HWVoice *hw = &sdl->hw;
174: int samples = len >> hw->shift;
175:
176: if (s->exit) {
177: return;
178: }
179:
180: while (samples) {
181: int to_mix, live, decr;
182:
183: /* dolog ("in callback samples=%d\n", samples); */
184: sdl_wait (s);
185: if (s->exit) {
186: return;
187: }
188:
189: sdl_lock (s);
190: live = pcm_hw_get_live (hw);
191: if (live <= 0)
192: goto again;
193:
194: /* dolog ("in callback live=%d\n", live); */
195: to_mix = audio_MIN (samples, live);
196: decr = to_mix;
197: while (to_mix) {
198: int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
199: st_sample_t *src = hw->mix_buf + hw->rpos;
200:
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;
205: to_mix -= chunk;
206: buf += chunk << hw->shift;
207: }
208: samples -= decr;
209: pcm_hw_dec_live (hw, decr);
210:
211: again:
212: sdl_unlock (s);
213: }
214: /* dolog ("done len=%d\n", len); */
215: }
216:
217: static void sdl_hw_fini (HWVoice *hw)
218: {
219: ldebug ("sdl_hw_fini %d fixed=%d\n",
220: glob_sdl.initialized, audio_state.fixed_format);
221: sdl_close (&glob_sdl);
222: }
223:
224: static int sdl_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
225: {
226: SDLVoice *sdl = (SDLVoice *) hw;
227: SDLAudioState *s = &glob_sdl;
228: SDL_AudioSpec req, obt;
229: int shift;
230:
231: ldebug ("sdl_hw_init %d freq=%d fixed=%d\n",
232: s->initialized, freq, audio_state.fixed_format);
233:
234: if (nchannels != 2) {
235: dolog ("Bogus channel count %d\n", nchannels);
236: return -1;
237: }
238:
239: req.freq = freq;
240: req.format = AUD_to_sdlfmt (fmt, &shift);
241: req.channels = nchannels;
242: req.samples = conf.nb_samples;
243: shift <<= nchannels == 2;
244:
245: req.callback = sdl_callback;
246: req.userdata = sdl;
247:
248: if (sdl_open (&req, &obt))
249: return -1;
250:
251: hw->freq = obt.freq;
252: hw->fmt = sdl_to_audfmt (obt.format);
253: hw->nchannels = obt.channels;
254: hw->bufsize = obt.samples << shift;
255:
256: s->initialized = 1;
257: s->exit = 0;
258: SDL_PauseAudio (0);
259: return 0;
260: }
261:
262: static int sdl_hw_ctl (HWVoice *hw, int cmd, ...)
263: {
264: (void) hw;
265:
266: switch (cmd) {
267: case VOICE_ENABLE:
268: SDL_PauseAudio (0);
269: break;
270:
271: case VOICE_DISABLE:
272: SDL_PauseAudio (1);
273: break;
274: }
275: return 0;
276: }
277:
278: static void *sdl_audio_init (void)
279: {
280: SDLAudioState *s = &glob_sdl;
281: conf.nb_samples = audio_get_conf_int (QC_SDL_SAMPLES, conf.nb_samples);
282:
283: if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
284: dolog ("SDL failed to initialize audio subsystem\nReason: %s\n",
285: errstr ());
286: return NULL;
287: }
288:
289: s->mutex = SDL_CreateMutex ();
290: if (!s->mutex) {
291: dolog ("Failed to create SDL mutex\nReason: %s\n", errstr ());
292: SDL_QuitSubSystem (SDL_INIT_AUDIO);
293: return NULL;
294: }
295:
296: s->sem = SDL_CreateSemaphore (0);
297: if (!s->sem) {
298: dolog ("Failed to create SDL semaphore\nReason: %s\n", errstr ());
299: SDL_DestroyMutex (s->mutex);
300: SDL_QuitSubSystem (SDL_INIT_AUDIO);
301: return NULL;
302: }
303:
304: return s;
305: }
306:
307: static void sdl_audio_fini (void *opaque)
308: {
309: SDLAudioState *s = opaque;
310: sdl_close (s);
311: SDL_DestroySemaphore (s->sem);
312: SDL_DestroyMutex (s->mutex);
313: SDL_QuitSubSystem (SDL_INIT_AUDIO);
314: }
315:
316: struct pcm_ops sdl_pcm_ops = {
317: sdl_hw_init,
318: sdl_hw_fini,
319: sdl_hw_run,
320: sdl_hw_write,
321: sdl_hw_ctl
322: };
323:
324: struct audio_output_driver sdl_output_driver = {
325: "sdl",
326: sdl_audio_init,
327: sdl_audio_fini,
328: &sdl_pcm_ops,
329: 1,
330: 1,
331: sizeof (SDLVoice)
332: };
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