diff options
Diffstat (limited to 'apps/plugins/sdl/src/audio/dma/SDL_dmaaudio.c')
-rw-r--r-- | apps/plugins/sdl/src/audio/dma/SDL_dmaaudio.c | 455 |
1 files changed, 0 insertions, 455 deletions
diff --git a/apps/plugins/sdl/src/audio/dma/SDL_dmaaudio.c b/apps/plugins/sdl/src/audio/dma/SDL_dmaaudio.c deleted file mode 100644 index 39f81d90ce..0000000000 --- a/apps/plugins/sdl/src/audio/dma/SDL_dmaaudio.c +++ /dev/null | |||
@@ -1,455 +0,0 @@ | |||
1 | /* | ||
2 | SDL - Simple DirectMedia Layer | ||
3 | Copyright (C) 1997-2012 Sam Lantinga | ||
4 | |||
5 | This library is free software; you can redistribute it and/or | ||
6 | modify it under the terms of the GNU Lesser General Public | ||
7 | License as published by the Free Software Foundation; either | ||
8 | version 2.1 of the License, or (at your option) any later version. | ||
9 | |||
10 | This library is distributed in the hope that it will be useful, | ||
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
13 | Lesser General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU Lesser General Public | ||
16 | License along with this library; if not, write to the Free Software | ||
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | ||
18 | |||
19 | Sam Lantinga | ||
20 | slouken@libsdl.org | ||
21 | */ | ||
22 | #include "SDL_config.h" | ||
23 | |||
24 | /* Allow access to a raw mixing buffer */ | ||
25 | |||
26 | #include <stdio.h> | ||
27 | #include <string.h> /* For strerror() */ | ||
28 | #include <errno.h> | ||
29 | #include <unistd.h> | ||
30 | #include <fcntl.h> | ||
31 | #include <signal.h> | ||
32 | #include <sys/types.h> | ||
33 | #include <sys/time.h> | ||
34 | #include <sys/ioctl.h> | ||
35 | #include <sys/stat.h> | ||
36 | #include <sys/mman.h> | ||
37 | |||
38 | #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H | ||
39 | /* This is installed on some systems */ | ||
40 | #include <soundcard.h> | ||
41 | #else | ||
42 | /* This is recommended by OSS */ | ||
43 | #include <sys/soundcard.h> | ||
44 | #endif | ||
45 | |||
46 | #ifndef MAP_FAILED | ||
47 | #define MAP_FAILED ((Uint8 *)-1) | ||
48 | #endif | ||
49 | |||
50 | #include "SDL_timer.h" | ||
51 | #include "SDL_audio.h" | ||
52 | #include "../SDL_audio_c.h" | ||
53 | #include "../SDL_audiodev_c.h" | ||
54 | #include "SDL_dmaaudio.h" | ||
55 | |||
56 | /* The tag name used by DMA audio */ | ||
57 | #define DMA_DRIVER_NAME "dma" | ||
58 | |||
59 | /* Open the audio device for playback, and don't block if busy */ | ||
60 | #define OPEN_FLAGS (O_RDWR|O_NONBLOCK) | ||
61 | |||
62 | /* Audio driver functions */ | ||
63 | static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec); | ||
64 | static void DMA_WaitAudio(_THIS); | ||
65 | static void DMA_PlayAudio(_THIS); | ||
66 | static Uint8 *DMA_GetAudioBuf(_THIS); | ||
67 | static void DMA_CloseAudio(_THIS); | ||
68 | |||
69 | /* Audio driver bootstrap functions */ | ||
70 | |||
71 | static int Audio_Available(void) | ||
72 | { | ||
73 | int available; | ||
74 | int fd; | ||
75 | |||
76 | available = 0; | ||
77 | |||
78 | fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); | ||
79 | if ( fd >= 0 ) { | ||
80 | int caps; | ||
81 | struct audio_buf_info info; | ||
82 | |||
83 | if ( (ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) && | ||
84 | (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) && | ||
85 | (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0) ) { | ||
86 | available = 1; | ||
87 | } | ||
88 | close(fd); | ||
89 | } | ||
90 | return(available); | ||
91 | } | ||
92 | |||
93 | static void Audio_DeleteDevice(SDL_AudioDevice *device) | ||
94 | { | ||
95 | SDL_free(device->hidden); | ||
96 | SDL_free(device); | ||
97 | } | ||
98 | |||
99 | static SDL_AudioDevice *Audio_CreateDevice(int devindex) | ||
100 | { | ||
101 | SDL_AudioDevice *this; | ||
102 | |||
103 | /* Initialize all variables that we clean on shutdown */ | ||
104 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); | ||
105 | if ( this ) { | ||
106 | SDL_memset(this, 0, (sizeof *this)); | ||
107 | this->hidden = (struct SDL_PrivateAudioData *) | ||
108 | SDL_malloc((sizeof *this->hidden)); | ||
109 | } | ||
110 | if ( (this == NULL) || (this->hidden == NULL) ) { | ||
111 | SDL_OutOfMemory(); | ||
112 | if ( this ) { | ||
113 | SDL_free(this); | ||
114 | } | ||
115 | return(0); | ||
116 | } | ||
117 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); | ||
118 | audio_fd = -1; | ||
119 | |||
120 | /* Set the function pointers */ | ||
121 | this->OpenAudio = DMA_OpenAudio; | ||
122 | this->WaitAudio = DMA_WaitAudio; | ||
123 | this->PlayAudio = DMA_PlayAudio; | ||
124 | this->GetAudioBuf = DMA_GetAudioBuf; | ||
125 | this->CloseAudio = DMA_CloseAudio; | ||
126 | |||
127 | this->free = Audio_DeleteDevice; | ||
128 | |||
129 | return this; | ||
130 | } | ||
131 | |||
132 | AudioBootStrap DMA_bootstrap = { | ||
133 | DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio", | ||
134 | Audio_Available, Audio_CreateDevice | ||
135 | }; | ||
136 | |||
137 | /* This function waits until it is possible to write a full sound buffer */ | ||
138 | static void DMA_WaitAudio(_THIS) | ||
139 | { | ||
140 | fd_set fdset; | ||
141 | |||
142 | /* Check to see if the thread-parent process is still alive */ | ||
143 | { static int cnt = 0; | ||
144 | /* Note that this only works with thread implementations | ||
145 | that use a different process id for each thread. | ||
146 | */ | ||
147 | if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | ||
148 | if ( kill(parent, 0) < 0 ) { | ||
149 | this->enabled = 0; | ||
150 | } | ||
151 | } | ||
152 | } | ||
153 | |||
154 | /* See if we need to use timed audio synchronization */ | ||
155 | if ( frame_ticks ) { | ||
156 | /* Use timer for general audio synchronization */ | ||
157 | Sint32 ticks; | ||
158 | |||
159 | ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | ||
160 | if ( ticks > 0 ) { | ||
161 | SDL_Delay(ticks); | ||
162 | } | ||
163 | } else { | ||
164 | /* Use select() for audio synchronization */ | ||
165 | struct timeval timeout; | ||
166 | FD_ZERO(&fdset); | ||
167 | FD_SET(audio_fd, &fdset); | ||
168 | timeout.tv_sec = 10; | ||
169 | timeout.tv_usec = 0; | ||
170 | #ifdef DEBUG_AUDIO | ||
171 | fprintf(stderr, "Waiting for audio to get ready\n"); | ||
172 | #endif | ||
173 | if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) { | ||
174 | const char *message = | ||
175 | #ifdef AUDIO_OSPACE_HACK | ||
176 | "Audio timeout - buggy audio driver? (trying ospace)"; | ||
177 | #else | ||
178 | "Audio timeout - buggy audio driver? (disabled)"; | ||
179 | #endif | ||
180 | /* In general we should never print to the screen, | ||
181 | but in this case we have no other way of letting | ||
182 | the user know what happened. | ||
183 | */ | ||
184 | fprintf(stderr, "SDL: %s\n", message); | ||
185 | #ifdef AUDIO_OSPACE_HACK | ||
186 | /* We may be able to use GET_OSPACE trick */ | ||
187 | frame_ticks = (float)(this->spec->samples*1000) / | ||
188 | this->spec->freq; | ||
189 | next_frame = SDL_GetTicks()+frame_ticks; | ||
190 | #else | ||
191 | this->enabled = 0; | ||
192 | /* Don't try to close - may hang */ | ||
193 | audio_fd = -1; | ||
194 | #ifdef DEBUG_AUDIO | ||
195 | fprintf(stderr, "Done disabling audio\n"); | ||
196 | #endif | ||
197 | #endif /* AUDIO_OSPACE_HACK */ | ||
198 | } | ||
199 | #ifdef DEBUG_AUDIO | ||
200 | fprintf(stderr, "Ready!\n"); | ||
201 | #endif | ||
202 | } | ||
203 | } | ||
204 | |||
205 | static void DMA_PlayAudio(_THIS) | ||
206 | { | ||
207 | /* If timer synchronization is enabled, set the next write frame */ | ||
208 | if ( frame_ticks ) { | ||
209 | next_frame += frame_ticks; | ||
210 | } | ||
211 | return; | ||
212 | } | ||
213 | |||
214 | static Uint8 *DMA_GetAudioBuf(_THIS) | ||
215 | { | ||
216 | count_info info; | ||
217 | int playing; | ||
218 | int filling; | ||
219 | |||
220 | /* Get number of blocks, looping if we're not using select() */ | ||
221 | do { | ||
222 | if ( ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0 ) { | ||
223 | /* Uh oh... */ | ||
224 | this->enabled = 0; | ||
225 | return(NULL); | ||
226 | } | ||
227 | } while ( frame_ticks && (info.blocks < 1) ); | ||
228 | #ifdef DEBUG_AUDIO | ||
229 | if ( info.blocks > 1 ) { | ||
230 | printf("Warning: audio underflow (%d frags)\n", info.blocks-1); | ||
231 | } | ||
232 | #endif | ||
233 | playing = info.ptr / this->spec.size; | ||
234 | filling = (playing + 1)%num_buffers; | ||
235 | return (dma_buf + (filling * this->spec.size)); | ||
236 | } | ||
237 | |||
238 | static void DMA_CloseAudio(_THIS) | ||
239 | { | ||
240 | if ( dma_buf != NULL ) { | ||
241 | munmap(dma_buf, dma_len); | ||
242 | dma_buf = NULL; | ||
243 | } | ||
244 | if ( audio_fd >= 0 ) { | ||
245 | close(audio_fd); | ||
246 | audio_fd = -1; | ||
247 | } | ||
248 | } | ||
249 | |||
250 | static int DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo, | ||
251 | SDL_AudioSpec *spec) | ||
252 | { | ||
253 | int frag_spec; | ||
254 | int value; | ||
255 | |||
256 | /* Close and then reopen the audio device */ | ||
257 | close(audio_fd); | ||
258 | audio_fd = open(audiodev, O_RDWR, 0); | ||
259 | if ( audio_fd < 0 ) { | ||
260 | SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | ||
261 | return(-1); | ||
262 | } | ||
263 | |||
264 | /* Calculate the final parameters for this audio specification */ | ||
265 | SDL_CalculateAudioSpec(spec); | ||
266 | |||
267 | /* Determine the power of two of the fragment size */ | ||
268 | for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | ||
269 | if ( (0x01<<frag_spec) != spec->size ) { | ||
270 | SDL_SetError("Fragment size must be a power of two"); | ||
271 | return(-1); | ||
272 | } | ||
273 | |||
274 | /* Set the audio buffering parameters */ | ||
275 | if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { | ||
276 | SDL_SetError("Couldn't set audio fragment spec"); | ||
277 | return(-1); | ||
278 | } | ||
279 | |||
280 | /* Set the audio format */ | ||
281 | value = format; | ||
282 | if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || | ||
283 | (value != format) ) { | ||
284 | SDL_SetError("Couldn't set audio format"); | ||
285 | return(-1); | ||
286 | } | ||
287 | |||
288 | /* Set mono or stereo audio */ | ||
289 | value = (spec->channels > 1); | ||
290 | if ( (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) || | ||
291 | (value != stereo) ) { | ||
292 | SDL_SetError("Couldn't set audio channels"); | ||
293 | return(-1); | ||
294 | } | ||
295 | |||
296 | /* Set the DSP frequency */ | ||
297 | value = spec->freq; | ||
298 | if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { | ||
299 | SDL_SetError("Couldn't set audio frequency"); | ||
300 | return(-1); | ||
301 | } | ||
302 | spec->freq = value; | ||
303 | |||
304 | /* We successfully re-opened the audio */ | ||
305 | return(0); | ||
306 | } | ||
307 | |||
308 | static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec) | ||
309 | { | ||
310 | char audiodev[1024]; | ||
311 | int format; | ||
312 | int stereo; | ||
313 | int value; | ||
314 | Uint16 test_format; | ||
315 | struct audio_buf_info info; | ||
316 | |||
317 | /* Reset the timer synchronization flag */ | ||
318 | frame_ticks = 0.0; | ||
319 | |||
320 | /* Open the audio device */ | ||
321 | audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); | ||
322 | if ( audio_fd < 0 ) { | ||
323 | SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | ||
324 | return(-1); | ||
325 | } | ||
326 | dma_buf = NULL; | ||
327 | ioctl(audio_fd, SNDCTL_DSP_RESET, 0); | ||
328 | |||
329 | /* Get a list of supported hardware formats */ | ||
330 | if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { | ||
331 | SDL_SetError("Couldn't get audio format list"); | ||
332 | return(-1); | ||
333 | } | ||
334 | |||
335 | /* Try for a closest match on audio format */ | ||
336 | format = 0; | ||
337 | for ( test_format = SDL_FirstAudioFormat(spec->format); | ||
338 | ! format && test_format; ) { | ||
339 | #ifdef DEBUG_AUDIO | ||
340 | fprintf(stderr, "Trying format 0x%4.4x\n", test_format); | ||
341 | #endif | ||
342 | switch ( test_format ) { | ||
343 | case AUDIO_U8: | ||
344 | if ( value & AFMT_U8 ) { | ||
345 | format = AFMT_U8; | ||
346 | } | ||
347 | break; | ||
348 | case AUDIO_S8: | ||
349 | if ( value & AFMT_S8 ) { | ||
350 | format = AFMT_S8; | ||
351 | } | ||
352 | break; | ||
353 | case AUDIO_S16LSB: | ||
354 | if ( value & AFMT_S16_LE ) { | ||
355 | format = AFMT_S16_LE; | ||
356 | } | ||
357 | break; | ||
358 | case AUDIO_S16MSB: | ||
359 | if ( value & AFMT_S16_BE ) { | ||
360 | format = AFMT_S16_BE; | ||
361 | } | ||
362 | break; | ||
363 | case AUDIO_U16LSB: | ||
364 | if ( value & AFMT_U16_LE ) { | ||
365 | format = AFMT_U16_LE; | ||
366 | } | ||
367 | break; | ||
368 | case AUDIO_U16MSB: | ||
369 | if ( value & AFMT_U16_BE ) { | ||
370 | format = AFMT_U16_BE; | ||
371 | } | ||
372 | break; | ||
373 | default: | ||
374 | format = 0; | ||
375 | break; | ||
376 | } | ||
377 | if ( ! format ) { | ||
378 | test_format = SDL_NextAudioFormat(); | ||
379 | } | ||
380 | } | ||
381 | if ( format == 0 ) { | ||
382 | SDL_SetError("Couldn't find any hardware audio formats"); | ||
383 | return(-1); | ||
384 | } | ||
385 | spec->format = test_format; | ||
386 | |||
387 | /* Set the audio format */ | ||
388 | value = format; | ||
389 | if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || | ||
390 | (value != format) ) { | ||
391 | SDL_SetError("Couldn't set audio format"); | ||
392 | return(-1); | ||
393 | } | ||
394 | |||
395 | /* Set mono or stereo audio (currently only two channels supported) */ | ||
396 | stereo = (spec->channels > 1); | ||
397 | ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo); | ||
398 | if ( stereo ) { | ||
399 | spec->channels = 2; | ||
400 | } else { | ||
401 | spec->channels = 1; | ||
402 | } | ||
403 | |||
404 | /* Because some drivers don't allow setting the buffer size | ||
405 | after setting the format, we must re-open the audio device | ||
406 | once we know what format and channels are supported | ||
407 | */ | ||
408 | if ( DMA_ReopenAudio(this, audiodev, format, stereo, spec) < 0 ) { | ||
409 | /* Error is set by DMA_ReopenAudio() */ | ||
410 | return(-1); | ||
411 | } | ||
412 | |||
413 | /* Memory map the audio buffer */ | ||
414 | if ( ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0 ) { | ||
415 | SDL_SetError("Couldn't get OSPACE parameters"); | ||
416 | return(-1); | ||
417 | } | ||
418 | spec->size = info.fragsize; | ||
419 | spec->samples = spec->size / ((spec->format & 0xFF) / 8); | ||
420 | spec->samples /= spec->channels; | ||
421 | num_buffers = info.fragstotal; | ||
422 | dma_len = num_buffers*spec->size; | ||
423 | dma_buf = (Uint8 *)mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED, | ||
424 | audio_fd, 0); | ||
425 | if ( dma_buf == MAP_FAILED ) { | ||
426 | SDL_SetError("DMA memory map failed"); | ||
427 | dma_buf = NULL; | ||
428 | return(-1); | ||
429 | } | ||
430 | SDL_memset(dma_buf, spec->silence, dma_len); | ||
431 | |||
432 | /* Check to see if we need to use select() workaround */ | ||
433 | { char *workaround; | ||
434 | workaround = SDL_getenv("SDL_DSP_NOSELECT"); | ||
435 | if ( workaround ) { | ||
436 | frame_ticks = (float)(spec->samples*1000)/spec->freq; | ||
437 | next_frame = SDL_GetTicks()+frame_ticks; | ||
438 | } | ||
439 | } | ||
440 | |||
441 | /* Trigger audio playback */ | ||
442 | value = 0; | ||
443 | ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value); | ||
444 | value = PCM_ENABLE_OUTPUT; | ||
445 | if ( ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0 ) { | ||
446 | SDL_SetError("Couldn't trigger audio output"); | ||
447 | return(-1); | ||
448 | } | ||
449 | |||
450 | /* Get the parent process id (we're the parent of the audio thread) */ | ||
451 | parent = getpid(); | ||
452 | |||
453 | /* We're ready to rock and roll. :-) */ | ||
454 | return(0); | ||
455 | } | ||