/
SDL_pulseaudio.c
566 lines (499 loc) · 15.4 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2009 Sam Lantinga
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
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
Lesser General Public License for more details.
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
Stéphan Kochen
stephan@kochen.nl
22
23
24
25
26
27
28
29
30
31
Based on parts of the ALSA and ESounD output drivers.
*/
#include "SDL_config.h"
/* Allow access to an PulseAudio network stream mixing buffer */
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
32
#include <pulse/pulseaudio.h>
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
#include <pulse/simple.h>
#include "SDL_timer.h"
#include "SDL_audio.h"
#include "../SDL_audiomem.h"
#include "../SDL_audio_c.h"
#include "../SDL_audiodev_c.h"
#include "SDL_pulseaudio.h"
#ifdef SDL_AUDIO_DRIVER_PULSE_DYNAMIC
#include "SDL_name.h"
#include "SDL_loadso.h"
#else
#define SDL_NAME(X) X
#endif
/* The tag name used by the driver */
#define PULSE_DRIVER_NAME "pulse"
/* Audio driver functions */
static int PULSE_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void PULSE_WaitAudio(_THIS);
static void PULSE_PlayAudio(_THIS);
static Uint8 *PULSE_GetAudioBuf(_THIS);
static void PULSE_CloseAudio(_THIS);
58
static void PULSE_WaitDone(_THIS);
59
static void PULSE_SetCaption(_THIS, const char *str);
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
#ifdef SDL_AUDIO_DRIVER_PULSE_DYNAMIC
static const char *pulse_library = SDL_AUDIO_DRIVER_PULSE_DYNAMIC;
static void *pulse_handle = NULL;
static int pulse_loaded = 0;
static pa_simple* (*SDL_NAME(pa_simple_new))(
const char *server,
const char *name,
pa_stream_direction_t dir,
const char *dev,
const char *stream_name,
const pa_sample_spec *ss,
const pa_channel_map *map,
const pa_buffer_attr *attr,
int *error
);
static void (*SDL_NAME(pa_simple_free))(pa_simple *s);
80
81
82
83
84
static pa_channel_map* (*SDL_NAME(pa_channel_map_init_auto))(
pa_channel_map *m,
unsigned channels,
pa_channel_map_def_t def
);
86
87
88
89
static pa_mainloop * (*SDL_NAME(pa_mainloop_new))(void);
static pa_mainloop_api * (*SDL_NAME(pa_mainloop_get_api))(pa_mainloop *m);
static int (*SDL_NAME(pa_mainloop_iterate))(pa_mainloop *m, int block, int *retval);
static void (*SDL_NAME(pa_mainloop_free))(pa_mainloop *m);
91
92
93
static pa_operation_state_t (*SDL_NAME(pa_operation_get_state))(pa_operation *o);
static void (*SDL_NAME(pa_operation_cancel))(pa_operation *o);
static void (*SDL_NAME(pa_operation_unref))(pa_operation *o);
95
static pa_context * (*SDL_NAME(pa_context_new))(
96
pa_mainloop_api *m, const char *name);
97
static int (*SDL_NAME(pa_context_connect))(
98
99
pa_context *c, const char *server,
pa_context_flags_t flags, const pa_spawn_api *api);
100
101
102
static pa_context_state_t (*SDL_NAME(pa_context_get_state))(pa_context *c);
static void (*SDL_NAME(pa_context_disconnect))(pa_context *c);
static void (*SDL_NAME(pa_context_unref))(pa_context *c);
104
static pa_stream * (*SDL_NAME(pa_stream_new))(pa_context *c,
105
const char *name, const pa_sample_spec *ss, const pa_channel_map *map);
106
static int (*SDL_NAME(pa_stream_connect_playback))(pa_stream *s, const char *dev,
107
108
const pa_buffer_attr *attr, pa_stream_flags_t flags,
pa_cvolume *volume, pa_stream *sync_stream);
109
110
111
static pa_stream_state_t (*SDL_NAME(pa_stream_get_state))(pa_stream *s);
static size_t (*SDL_NAME(pa_stream_writable_size))(pa_stream *s);
static int (*SDL_NAME(pa_stream_write))(pa_stream *s, const void *data, size_t nbytes,
112
pa_free_cb_t free_cb, int64_t offset, pa_seek_mode_t seek);
113
static pa_operation * (*SDL_NAME(pa_stream_drain))(pa_stream *s,
114
pa_stream_success_cb_t cb, void *userdata);
115
116
static int (*SDL_NAME(pa_stream_disconnect))(pa_stream *s);
static void (*SDL_NAME(pa_stream_unref))(pa_stream *s);
117
118
static pa_operation* (*SDL_NAME(pa_context_set_name))(pa_context *c,
const char *name, pa_context_success_cb_t cb, void *userdata);
119
120
121
122
123
124
125
126
127
128
129
static struct {
const char *name;
void **func;
} pulse_functions[] = {
{ "pa_simple_new",
(void **)&SDL_NAME(pa_simple_new) },
{ "pa_simple_free",
(void **)&SDL_NAME(pa_simple_free) },
{ "pa_channel_map_init_auto",
(void **)&SDL_NAME(pa_channel_map_init_auto) },
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
{ "pa_mainloop_new",
(void **)&SDL_NAME(pa_mainloop_new) },
{ "pa_mainloop_get_api",
(void **)&SDL_NAME(pa_mainloop_get_api) },
{ "pa_mainloop_iterate",
(void **)&SDL_NAME(pa_mainloop_iterate) },
{ "pa_mainloop_free",
(void **)&SDL_NAME(pa_mainloop_free) },
{ "pa_operation_get_state",
(void **)&SDL_NAME(pa_operation_get_state) },
{ "pa_operation_cancel",
(void **)&SDL_NAME(pa_operation_cancel) },
{ "pa_operation_unref",
(void **)&SDL_NAME(pa_operation_unref) },
{ "pa_context_new",
(void **)&SDL_NAME(pa_context_new) },
{ "pa_context_connect",
(void **)&SDL_NAME(pa_context_connect) },
{ "pa_context_get_state",
(void **)&SDL_NAME(pa_context_get_state) },
{ "pa_context_disconnect",
(void **)&SDL_NAME(pa_context_disconnect) },
{ "pa_context_unref",
(void **)&SDL_NAME(pa_context_unref) },
{ "pa_stream_new",
(void **)&SDL_NAME(pa_stream_new) },
{ "pa_stream_connect_playback",
(void **)&SDL_NAME(pa_stream_connect_playback) },
{ "pa_stream_get_state",
(void **)&SDL_NAME(pa_stream_get_state) },
{ "pa_stream_writable_size",
(void **)&SDL_NAME(pa_stream_writable_size) },
{ "pa_stream_write",
(void **)&SDL_NAME(pa_stream_write) },
{ "pa_stream_drain",
(void **)&SDL_NAME(pa_stream_drain) },
{ "pa_stream_disconnect",
(void **)&SDL_NAME(pa_stream_disconnect) },
{ "pa_stream_unref",
(void **)&SDL_NAME(pa_stream_unref) },
170
171
{ "pa_context_set_name",
(void **)&SDL_NAME(pa_context_set_name) },
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
};
static void UnloadPulseLibrary()
{
if ( pulse_loaded ) {
SDL_UnloadObject(pulse_handle);
pulse_handle = NULL;
pulse_loaded = 0;
}
}
static int LoadPulseLibrary(void)
{
int i, retval = -1;
pulse_handle = SDL_LoadObject(pulse_library);
if ( pulse_handle ) {
pulse_loaded = 1;
retval = 0;
for ( i=0; i<SDL_arraysize(pulse_functions); ++i ) {
*pulse_functions[i].func = SDL_LoadFunction(pulse_handle, pulse_functions[i].name);
if ( !*pulse_functions[i].func ) {
retval = -1;
UnloadPulseLibrary();
break;
}
}
}
return retval;
}
#else
static void UnloadPulseLibrary()
{
return;
}
static int LoadPulseLibrary(void)
{
return 0;
}
#endif /* SDL_AUDIO_DRIVER_PULSE_DYNAMIC */
/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
pa_sample_spec paspec;
pa_simple *connection;
int available;
available = 0;
if ( LoadPulseLibrary() < 0 ) {
return available;
}
230
231
232
233
234
/* Connect with a dummy format. */
paspec.format = PA_SAMPLE_U8;
paspec.rate = 11025;
paspec.channels = 1;
connection = SDL_NAME(pa_simple_new)(
235
NULL, /* server */
236
237
"Test stream", /* application name */
PA_STREAM_PLAYBACK, /* playback mode */
238
NULL, /* device on the server */
239
240
241
242
243
244
245
246
247
248
"Simple DirectMedia Layer", /* stream description */
&paspec, /* sample format spec */
NULL, /* channel map */
NULL, /* buffering attributes */
NULL /* error code */
);
if ( connection != NULL ) {
available = 1;
SDL_NAME(pa_simple_free)(connection);
}
250
251
252
253
254
255
UnloadPulseLibrary();
return(available);
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
256
SDL_free(device->hidden->caption);
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
SDL_free(device->hidden);
SDL_free(device);
UnloadPulseLibrary();
}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
LoadPulseLibrary();
this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
if ( this ) {
SDL_memset(this, 0, (sizeof *this));
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
SDL_free(this);
}
return(0);
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
/* Set the function pointers */
this->OpenAudio = PULSE_OpenAudio;
this->WaitAudio = PULSE_WaitAudio;
this->PlayAudio = PULSE_PlayAudio;
this->GetAudioBuf = PULSE_GetAudioBuf;
this->CloseAudio = PULSE_CloseAudio;
289
this->WaitDone = PULSE_WaitDone;
290
this->SetCaption = PULSE_SetCaption;
291
292
293
294
295
296
297
298
299
300
301
302
303
304
this->free = Audio_DeleteDevice;
return this;
}
AudioBootStrap PULSE_bootstrap = {
PULSE_DRIVER_NAME, "PulseAudio",
Audio_Available, Audio_CreateDevice
};
/* This function waits until it is possible to write a full sound buffer */
static void PULSE_WaitAudio(_THIS)
{
305
306
307
308
309
310
311
int size;
while(1) {
if (SDL_NAME(pa_context_get_state)(context) != PA_CONTEXT_READY ||
SDL_NAME(pa_stream_get_state)(stream) != PA_STREAM_READY ||
SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
this->enabled = 0;
return;
312
}
313
314
315
size = SDL_NAME(pa_stream_writable_size)(stream);
if (size >= mixlen)
return;
316
317
318
319
320
321
}
}
static void PULSE_PlayAudio(_THIS)
{
/* Write the audio data */
322
if (SDL_NAME(pa_stream_write)(stream, mixbuf, mixlen, NULL, 0LL, PA_SEEK_RELATIVE) < 0)
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
this->enabled = 0;
}
static Uint8 *PULSE_GetAudioBuf(_THIS)
{
return(mixbuf);
}
static void PULSE_CloseAudio(_THIS)
{
if ( mixbuf != NULL ) {
SDL_FreeAudioMem(mixbuf);
mixbuf = NULL;
}
if ( stream != NULL ) {
338
339
SDL_NAME(pa_stream_disconnect)(stream);
SDL_NAME(pa_stream_unref)(stream);
340
341
stream = NULL;
}
342
343
344
345
346
347
348
349
350
if (context != NULL) {
SDL_NAME(pa_context_disconnect)(context);
SDL_NAME(pa_context_unref)(context);
context = NULL;
}
if (mainloop != NULL) {
SDL_NAME(pa_mainloop_free)(mainloop);
mainloop = NULL;
}
351
352
353
354
355
356
}
/* Try to get the name of the program */
static char *get_progname(void)
{
#ifdef __LINUX__
357
char *progname = NULL;
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
FILE *fp;
static char temp[BUFSIZ];
SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
fp = fopen(temp, "r");
if ( fp != NULL ) {
if ( fgets(temp, sizeof(temp)-1, fp) ) {
progname = SDL_strrchr(temp, '/');
if ( progname == NULL ) {
progname = temp;
} else {
progname = progname+1;
}
}
fclose(fp);
}
return(progname);
375
376
377
378
379
#elif defined(__NetBSD__)
return getprogname();
#else
return("unknown");
#endif
380
381
}
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
static void caption_set_complete(pa_context *c, int success, void *userdata)
{
/* no-op. */
}
static void PULSE_SetCaption(_THIS, const char *str)
{
SDL_free(this->hidden->caption);
if ((str == NULL) || (*str == '\0')) {
str = get_progname(); /* set a default so SOMETHING shows up. */
}
this->hidden->caption = SDL_strdup(str);
if (context != NULL) {
SDL_NAME(pa_context_set_name)(context, this->hidden->caption,
caption_set_complete, 0);
}
}
static void stream_drain_complete(pa_stream *s, int success, void *userdata)
{
/* no-op. */
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
}
static void PULSE_WaitDone(_THIS)
{
pa_operation *o;
o = SDL_NAME(pa_stream_drain)(stream, stream_drain_complete, NULL);
if (!o)
return;
while (SDL_NAME(pa_operation_get_state)(o) != PA_OPERATION_DONE) {
if (SDL_NAME(pa_context_get_state)(context) != PA_CONTEXT_READY ||
SDL_NAME(pa_stream_get_state)(stream) != PA_STREAM_READY ||
SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
SDL_NAME(pa_operation_cancel)(o);
break;
}
}
SDL_NAME(pa_operation_unref)(o);
}
424
425
static int PULSE_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
426
int state;
427
428
429
430
Uint16 test_format;
pa_sample_spec paspec;
pa_buffer_attr paattr;
pa_channel_map pacmap;
431
pa_stream_flags_t flags = 0;
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
paspec.format = PA_SAMPLE_INVALID;
for ( test_format = SDL_FirstAudioFormat(spec->format); test_format; ) {
switch ( test_format ) {
case AUDIO_U8:
paspec.format = PA_SAMPLE_U8;
break;
case AUDIO_S16LSB:
paspec.format = PA_SAMPLE_S16LE;
break;
case AUDIO_S16MSB:
paspec.format = PA_SAMPLE_S16BE;
break;
}
if ( paspec.format != PA_SAMPLE_INVALID )
break;
}
if (paspec.format == PA_SAMPLE_INVALID ) {
SDL_SetError("Couldn't find any suitable audio formats");
return(-1);
}
spec->format = test_format;
455
456
457
458
paspec.channels = spec->channels;
paspec.rate = spec->freq;
/* Calculate the final parameters for this audio specification */
459
460
461
#ifdef PA_STREAM_ADJUST_LATENCY
spec->samples /= 2; /* Mix in smaller chunck to avoid underruns */
#endif
462
463
464
465
466
467
468
469
470
SDL_CalculateAudioSpec(spec);
/* Allocate mixing buffer */
mixlen = spec->size;
mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
if ( mixbuf == NULL ) {
return(-1);
}
SDL_memset(mixbuf, spec->silence, spec->size);
472
/* Reduced prebuffering compared to the defaults. */
473
474
475
476
477
478
479
480
#ifdef PA_STREAM_ADJUST_LATENCY
paattr.tlength = mixlen * 4; /* 2x original requested bufsize */
paattr.prebuf = -1;
paattr.maxlength = -1;
paattr.minreq = mixlen; /* -1 can lead to pa_stream_writable_size()
>= mixlen never becoming true */
flags = PA_STREAM_ADJUST_LATENCY;
#else
481
482
483
paattr.tlength = mixlen*2;
paattr.prebuf = mixlen*2;
paattr.maxlength = mixlen*2;
484
485
paattr.minreq = mixlen;
#endif
487
488
489
490
/* The SDL ALSA output hints us that we use Windows' channel mapping */
/* http://bugzilla.libsdl.org/show_bug.cgi?id=110 */
SDL_NAME(pa_channel_map_init_auto)(
&pacmap, spec->channels, PA_CHANNEL_MAP_WAVEEX);
492
493
494
495
496
497
498
/* Set up a new main loop */
if (!(mainloop = SDL_NAME(pa_mainloop_new)())) {
PULSE_CloseAudio(this);
SDL_SetError("pa_mainloop_new() failed");
return(-1);
}
499
500
501
502
if (this->hidden->caption == NULL) {
this->hidden->caption = SDL_strdup(get_progname());
}
503
mainloop_api = SDL_NAME(pa_mainloop_get_api)(mainloop);
504
505
if (!(context = SDL_NAME(pa_context_new)(mainloop_api,
this->hidden->caption))) {
506
507
508
509
510
PULSE_CloseAudio(this);
SDL_SetError("pa_context_new() failed");
return(-1);
}
511
/* Connect to the PulseAudio server */
512
513
if (SDL_NAME(pa_context_connect)(context, NULL, 0, NULL) < 0) {
PULSE_CloseAudio(this);
514
SDL_SetError("Could not setup connection to PulseAudio");
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
return(-1);
}
do {
if (SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
PULSE_CloseAudio(this);
SDL_SetError("pa_mainloop_iterate() failed");
return(-1);
}
state = SDL_NAME(pa_context_get_state)(context);
if (!PA_CONTEXT_IS_GOOD(state)) {
PULSE_CloseAudio(this);
SDL_SetError("Could not connect to PulseAudio");
return(-1);
}
} while (state != PA_CONTEXT_READY);
stream = SDL_NAME(pa_stream_new)(
context,
534
535
"Simple DirectMedia Layer", /* stream description */
&paspec, /* sample format spec */
536
&pacmap /* channel map */
537
538
539
);
if ( stream == NULL ) {
PULSE_CloseAudio(this);
540
SDL_SetError("Could not setup PulseAudio stream");
541
542
543
return(-1);
}
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
if (SDL_NAME(pa_stream_connect_playback)(stream, NULL, &paattr, flags,
NULL, NULL) < 0) {
PULSE_CloseAudio(this);
SDL_SetError("Could not connect PulseAudio stream");
return(-1);
}
do {
if (SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
PULSE_CloseAudio(this);
SDL_SetError("pa_mainloop_iterate() failed");
return(-1);
}
state = SDL_NAME(pa_stream_get_state)(stream);
if (!PA_STREAM_IS_GOOD(state)) {
PULSE_CloseAudio(this);
SDL_SetError("Could not create to PulseAudio stream");
return(-1);
}
} while (state != PA_STREAM_READY);
565
566
return(0);
}