This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_paudio.c
562 lines (503 loc) · 18 KB
1
/*
2
3
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 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
11
12
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
Lesser General Public License for more details.
14
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19
20
21
22
23
Carsten Griwodz
griff@kom.tu-darmstadt.de
based on linux/SDL_dspaudio.c by Sam Lantinga
*/
24
#include "SDL_config.h"
25
26
27
28
29
30
31
32
/* Allow access to a raw mixing buffer */
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/ioctl.h>
33
#include <sys/types.h>
34
35
#include <sys/stat.h>
36
#include "SDL_timer.h"
37
#include "SDL_audio.h"
38
#include "SDL_stdinc.h"
39
40
#include "../SDL_audiomem.h"
#include "../SDL_audio_c.h"
41
42
#include "SDL_paudio.h"
43
#define DEBUG_AUDIO 0
44
45
46
47
48
49
50
51
/* A conflict within AIX 4.3.3 <sys/> headers and probably others as well.
* I guess nobody ever uses audio... Shame over AIX header files. */
#include <sys/machine.h>
#undef BIG_ENDIAN
#include <sys/audio.h>
/* The tag name used by paud audio */
52
#define PAUDIO_DRIVER_NAME "paud"
53
54
55
56
57
/* Open the audio device for playback, and don't block if busy */
/* #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) */
#define OPEN_FLAGS O_WRONLY
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
/* Get the name of the audio device we use for output */
#ifndef _PATH_DEV_DSP
#define _PATH_DEV_DSP "/dev/%caud%c/%c"
#endif
static char devsettings[][3] = {
{'p', '0', '1'}, {'p', '0', '2'}, {'p', '0', '3'}, {'p', '0', '4'},
{'p', '1', '1'}, {'p', '1', '2'}, {'p', '1', '3'}, {'p', '1', '4'},
{'p', '2', '1'}, {'p', '2', '2'}, {'p', '2', '3'}, {'p', '2', '4'},
{'p', '3', '1'}, {'p', '3', '2'}, {'p', '3', '3'}, {'p', '3', '4'},
{'b', '0', '1'}, {'b', '0', '2'}, {'b', '0', '3'}, {'b', '0', '4'},
{'b', '1', '1'}, {'b', '1', '2'}, {'b', '1', '3'}, {'b', '1', '4'},
{'b', '2', '1'}, {'b', '2', '2'}, {'b', '2', '3'}, {'b', '2', '4'},
{'b', '3', '1'}, {'b', '3', '2'}, {'b', '3', '3'}, {'b', '3', '4'},
{'\0', '\0', '\0'}
};
static int
OpenUserDefinedDevice(char *path, int maxlen, int flags)
{
const char *audiodev;
80
int fd;
81
82
83
84
85
86
87
88
/* Figure out what our audio device is */
if ((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) {
audiodev = SDL_getenv("AUDIODEV");
}
if (audiodev == NULL) {
return -1;
}
89
fd = open(audiodev, flags, 0);
90
91
92
93
if (path != NULL) {
SDL_strlcpy(path, audiodev, maxlen);
path[maxlen - 1] = '\0';
}
94
return fd;
95
96
}
97
static int
98
99
100
OpenAudioPath(char *path, int maxlen, int flags, int classic)
{
struct stat sb;
101
102
int cycle = 0;
int fd = OpenUserDefinedDevice(path, maxlen, flags);
103
104
105
if (fd != -1) {
return fd;
106
107
108
109
}
/* !!! FIXME: do we really need a table here? */
while (devsettings[cycle][0] != '\0') {
110
char audiopath[1024];
111
112
113
114
115
116
SDL_snprintf(audiopath, SDL_arraysize(audiopath),
_PATH_DEV_DSP,
devsettings[cycle][0],
devsettings[cycle][1], devsettings[cycle][2]);
if (stat(audiopath, &sb) == 0) {
117
118
fd = open(audiopath, flags, 0);
if (fd > 0) {
119
120
121
if (path != NULL) {
SDL_strlcpy(path, audiopath, maxlen);
}
122
return fd;
123
124
125
126
127
128
129
}
}
}
return -1;
}
130
static int
131
PAUDIO_Available(void)
132
{
133
134
135
136
int fd;
int available;
available = 0;
137
fd = OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
138
139
140
141
142
if (fd >= 0) {
available = 1;
close(fd);
}
return (available);
143
144
145
146
}
/* This function waits until it is possible to write a full sound buffer */
147
static void
148
PAUDIO_WaitDevice(_THIS)
149
150
151
152
{
fd_set fdset;
/* See if we need to use timed audio synchronization */
153
if (this->hidden->frame_ticks) {
154
155
156
/* Use timer for general audio synchronization */
Sint32 ticks;
157
ticks = ((Sint32)(this->hidden->next_frame-SDL_GetTicks()))-FUDGE_TICKS;
158
159
if (ticks > 0) {
SDL_Delay(ticks);
160
161
}
} else {
162
audio_buffer paud_bufinfo;
163
164
165
166
/* Use select() for audio synchronization */
struct timeval timeout;
FD_ZERO(&fdset);
167
FD_SET(this->hidden->audio_fd, &fdset);
168
169
if (ioctl(this->hidden->audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0) {
170
171
172
#ifdef DEBUG_AUDIO
fprintf(stderr, "Couldn't get audio buffer information\n");
#endif
173
timeout.tv_sec = 10;
174
175
timeout.tv_usec = 0;
} else {
176
177
178
179
long ms_in_buf = paud_bufinfo.write_buf_time;
timeout.tv_sec = ms_in_buf / 1000;
ms_in_buf = ms_in_buf - timeout.tv_sec * 1000;
timeout.tv_usec = ms_in_buf * 1000;
180
#ifdef DEBUG_AUDIO
181
182
183
fprintf(stderr,
"Waiting for write_buf_time=%ld,%ld\n",
timeout.tv_sec, timeout.tv_usec);
184
#endif
185
}
186
187
188
189
#ifdef DEBUG_AUDIO
fprintf(stderr, "Waiting for audio to get ready\n");
#endif
190
if (select(this->hidden->audio_fd+1,NULL,&fdset,NULL,&timeout) <= 0) {
191
192
const char *message =
"Audio timeout - buggy audio driver? (disabled)";
193
/*
194
* In general we should never print to the screen,
195
196
197
198
199
200
* but in this case we have no other way of letting
* the user know what happened.
*/
fprintf(stderr, "SDL: %s - %s\n", strerror(errno), message);
this->enabled = 0;
/* Don't try to close - may hang */
201
this->hidden->audio_fd = -1;
202
203
204
205
206
207
208
209
210
211
#ifdef DEBUG_AUDIO
fprintf(stderr, "Done disabling audio\n");
#endif
}
#ifdef DEBUG_AUDIO
fprintf(stderr, "Ready!\n");
#endif
}
}
212
static void
213
PAUDIO_PlayDevice(_THIS)
214
{
215
216
217
int written = 0;
const Uint8 *mixbuf = this->hidden->mixbuf;
const size_t mixlen = this->hidden->mixlen;
218
219
220
/* Write the audio data, checking for EAGAIN on broken audio drivers */
do {
221
written = write(this->hidden->audio_fd, mixbuf, mixlen);
222
223
224
225
226
227
228
229
if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
SDL_Delay(1); /* Let a little CPU time go by */
}
}
while ((written < 0) &&
((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
/* If timer synchronization is enabled, set the next write frame */
230
231
if (this->hidden->frame_ticks) {
this->hidden->next_frame += this->hidden->frame_ticks;
232
233
234
235
236
237
}
/* If we couldn't write, assume fatal error for now */
if (written < 0) {
this->enabled = 0;
}
238
#ifdef DEBUG_AUDIO
239
fprintf(stderr, "Wrote %d bytes of audio data\n", written);
240
241
242
#endif
}
243
static Uint8 *
244
PAUDIO_GetDeviceBuf(_THIS)
245
{
246
return this->hidden->mixbuf;
247
248
}
249
static void
250
PAUDIO_CloseDevice(_THIS)
251
{
252
253
254
255
256
257
258
259
260
261
262
if (this->hidden != NULL) {
if (this->hidden->mixbuf != NULL) {
SDL_FreeAudioMem(this->hidden->mixbuf);
this->hidden->mixbuf = NULL;
}
if (this->hidden->audio_fd >= 0) {
close(this->hidden->audio_fd);
this->hidden->audio_fd = -1;
}
SDL_free(this->hidden);
this->hidden = NULL;
263
}
264
265
}
266
static int
267
PAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
268
{
269
const char *workaround = SDL_getenv("SDL_DSP_NOSELECT");
270
char audiodev[1024];
271
const char *err = NULL;
272
273
int format;
int bytes_per_sample;
274
SDL_AudioFormat test_format;
275
276
277
278
279
audio_init paud_init;
audio_buffer paud_bufinfo;
audio_status paud_status;
audio_control paud_control;
audio_change paud_change;
280
int fd = -1;
281
282
283
284
285
286
287
288
289
/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
if (this->hidden == NULL) {
SDL_OutOfMemory();
return 0;
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
290
291
/* Open the audio device */
292
293
294
295
fd = OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
this->hidden->audio_fd = fd;
if (fd < 0) {
PAUDIO_CloseDevice(this);
296
SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
297
return 0;
298
299
300
301
302
303
}
/*
* We can't set the buffer size - just ask the device for the maximum
* that we can have.
*/
304
305
if (ioctl(fd, AUDIO_BUFFER, &paud_bufinfo) < 0) {
PAUDIO_CloseDevice(this);
306
SDL_SetError("Couldn't get audio buffer information");
307
return 0;
308
309
}
310
311
if (this->spec.channels > 1)
this->spec.channels = 2;
312
else
313
this->spec.channels = 1;
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
* Fields in the audio_init structure:
*
* Ignored by us:
*
* paud.loadpath[LOAD_PATH]; * DSP code to load, MWave chip only?
* paud.slot_number; * slot number of the adapter
* paud.device_id; * adapter identification number
*
* Input:
*
* paud.srate; * the sampling rate in Hz
* paud.bits_per_sample; * 8, 16, 32, ...
* paud.bsize; * block size for this rate
* paud.mode; * ADPCM, PCM, MU_LAW, A_LAW, SOURCE_MIX
* paud.channels; * 1=mono, 2=stereo
* paud.flags; * FIXED - fixed length data
* * LEFT_ALIGNED, RIGHT_ALIGNED (var len only)
* * TWOS_COMPLEMENT - 2's complement data
* * SIGNED - signed? comment seems wrong in sys/audio.h
* * BIG_ENDIAN
* paud.operation; * PLAY, RECORD
*
* Output:
*
* paud.flags; * PITCH - pitch is supported
* * INPUT - input is supported
* * OUTPUT - output is supported
* * MONITOR - monitor is supported
* * VOLUME - volume is supported
* * VOLUME_DELAY - volume delay is supported
* * BALANCE - balance is supported
* * BALANCE_DELAY - balance delay is supported
* * TREBLE - treble control is supported
* * BASS - bass control is supported
* * BESTFIT_PROVIDED - best fit returned
* * LOAD_CODE - DSP load needed
* paud.rc; * NO_PLAY - DSP code can't do play requests
* * NO_RECORD - DSP code can't do record requests
* * INVALID_REQUEST - request was invalid
* * CONFLICT - conflict with open's flags
* * OVERLOADED - out of DSP MIPS or memory
* paud.position_resolution; * smallest increment for position
*/
360
paud_init.srate = this->spec.freq;
361
362
paud_init.mode = PCM;
paud_init.operation = PLAY;
363
paud_init.channels = this->spec.channels;
364
365
366
/* Try for a closest match on audio format */
format = 0;
367
for (test_format = SDL_FirstAudioFormat(this->spec.format);
368
!format && test_format;) {
369
#ifdef DEBUG_AUDIO
370
fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
371
#endif
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
switch (test_format) {
case AUDIO_U8:
bytes_per_sample = 1;
paud_init.bits_per_sample = 8;
paud_init.flags = TWOS_COMPLEMENT | FIXED;
format = 1;
break;
case AUDIO_S8:
bytes_per_sample = 1;
paud_init.bits_per_sample = 8;
paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED;
format = 1;
break;
case AUDIO_S16LSB:
bytes_per_sample = 2;
paud_init.bits_per_sample = 16;
paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED;
format = 1;
break;
case AUDIO_S16MSB:
bytes_per_sample = 2;
paud_init.bits_per_sample = 16;
paud_init.flags = BIG_ENDIAN | SIGNED | TWOS_COMPLEMENT | FIXED;
format = 1;
break;
case AUDIO_U16LSB:
bytes_per_sample = 2;
paud_init.bits_per_sample = 16;
paud_init.flags = TWOS_COMPLEMENT | FIXED;
format = 1;
break;
case AUDIO_U16MSB:
bytes_per_sample = 2;
paud_init.bits_per_sample = 16;
paud_init.flags = BIG_ENDIAN | TWOS_COMPLEMENT | FIXED;
format = 1;
break;
default:
break;
}
if (!format) {
test_format = SDL_NextAudioFormat();
}
}
if (format == 0) {
417
#ifdef DEBUG_AUDIO
418
fprintf(stderr, "Couldn't find any hardware audio formats\n");
419
#endif
420
PAUDIO_CloseDevice(this);
421
SDL_SetError("Couldn't find any hardware audio formats");
422
return 0;
423
}
424
this->spec.format = test_format;
425
426
427
/*
* We know the buffer size and the max number of subsequent writes
428
429
430
* that can be pending. If more than one can pend, allow the application
* to do something like double buffering between our write buffer and
* the device's own buffer that we are filling with write() anyway.
431
*
432
433
434
* We calculate this->spec.samples like this because
* SDL_CalculateAudioSpec() will give put paud_bufinfo.write_buf_cap
* (or paud_bufinfo.write_buf_cap/2) into this->spec.size in return.
435
436
*/
if (paud_bufinfo.request_buf_cap == 1) {
437
438
this->spec.samples = paud_bufinfo.write_buf_cap
/ bytes_per_sample / this->spec.channels;
439
} else {
440
441
this->spec.samples = paud_bufinfo.write_buf_cap
/ bytes_per_sample / this->spec.channels / 2;
442
}
443
paud_init.bsize = bytes_per_sample * this->spec.channels;
444
445
SDL_CalculateAudioSpec(&this->spec);
446
447
448
449
450
451
452
453
454
/*
* The AIX paud device init can't modify the values of the audio_init
* structure that we pass to it. So we don't need any recalculation
* of this stuff and no reinit call as in linux dsp and dma code.
*
* /dev/paud supports all of the encoding formats, so we don't need
* to do anything like reopening the device, either.
*/
455
if (ioctl(fd, AUDIO_INIT, &paud_init) < 0) {
456
457
switch (paud_init.rc) {
case 1:
458
err = "Couldn't set audio format: DSP can't do play requests";
459
460
break;
case 2:
461
err = "Couldn't set audio format: DSP can't do record requests";
462
463
break;
case 4:
464
err = "Couldn't set audio format: request was invalid";
465
466
break;
case 5:
467
err = "Couldn't set audio format: conflict with open's flags";
468
469
break;
case 6:
470
err = "Couldn't set audio format: out of DSP MIPS or memory";
471
472
break;
default:
473
err = "Couldn't set audio format: not documented in sys/audio.h";
474
475
476
477
break;
}
}
478
479
480
481
482
483
if (err != NULL) {
PAUDIO_CloseDevice(this);
SDL_SetError("Paudio: %s", err);
return 0;
}
484
/* Allocate mixing buffer */
485
486
487
488
489
490
this->hidden->mixlen = this->spec.size;
this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
if (this->hidden->mixbuf == NULL) {
PAUDIO_CloseDevice(this);
SDL_OutOfMemory();
return 0;
491
}
492
SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
/*
* Set some paramters: full volume, first speaker that we can find.
* Ignore the other settings for now.
*/
paud_change.input = AUDIO_IGNORE; /* the new input source */
paud_change.output = OUTPUT_1; /* EXTERNAL_SPEAKER,INTERNAL_SPEAKER,OUTPUT_1 */
paud_change.monitor = AUDIO_IGNORE; /* the new monitor state */
paud_change.volume = 0x7fffffff; /* volume level [0-0x7fffffff] */
paud_change.volume_delay = AUDIO_IGNORE; /* the new volume delay */
paud_change.balance = 0x3fffffff; /* the new balance */
paud_change.balance_delay = AUDIO_IGNORE; /* the new balance delay */
paud_change.treble = AUDIO_IGNORE; /* the new treble state */
paud_change.bass = AUDIO_IGNORE; /* the new bass state */
paud_change.pitch = AUDIO_IGNORE; /* the new pitch state */
paud_control.ioctl_request = AUDIO_CHANGE;
paud_control.request_info = (char *) &paud_change;
511
if (ioctl(fd, AUDIO_CONTROL, &paud_control) < 0) {
512
#ifdef DEBUG_AUDIO
513
fprintf(stderr, "Can't change audio display settings\n");
514
#endif
515
516
517
518
519
520
521
522
}
/*
* Tell the device to expect data. Actual start will wait for
* the first write() call.
*/
paud_control.ioctl_request = AUDIO_START;
paud_control.position = 0;
523
524
if (ioctl(fd, AUDIO_CONTROL, &paud_control) < 0) {
PAUDIO_CloseDevice(this);
525
#ifdef DEBUG_AUDIO
526
fprintf(stderr, "Can't start audio play\n");
527
#endif
528
SDL_SetError("Can't start audio play");
529
return 0;
530
531
532
}
/* Check to see if we need to use select() workaround */
533
534
535
536
if (workaround != NULL) {
this->hidden->frame_ticks = (float) (this->spec.samples * 1000) /
this->spec.freq;
this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks;
537
}
538
539
/* We're ready to rock and roll. :-) */
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
return 1;
}
static int
PAUDIO_Init(SDL_AudioDriverImpl *impl)
{
/* Set the function pointers */
impl->OpenDevice = DSP_OpenDevice;
impl->PlayDevice = DSP_PlayDevice;
impl->PlayDevice = DSP_WaitDevice;
impl->GetDeviceBuf = DSP_GetDeviceBuf;
impl->CloseDevice = DSP_CloseDevice;
impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: add device enum! */
return 1;
555
556
}
557
558
559
560
561
AudioBootStrap PAUDIO_bootstrap = {
PAUDIO_DRIVER_NAME, "AIX Paudio",
PAUDIO_Available, PAUDIO_Init, 0
};
562
/* vi: set ts=4 sw=4 expandtab: */