2 * OpenAL cross platform audio library
3 * Copyright (C) 1999-2007 by authors.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 * Or go to http://www.gnu.org/copyleft/lgpl.html
29 #include <alsa/asoundlib.h>
32 static const ALCchar alsaDevice
[] = "ALSA Default";
36 static void *alsa_handle
;
37 #define MAKE_FUNC(f) static typeof(f) * p##f
38 MAKE_FUNC(snd_strerror
);
39 MAKE_FUNC(snd_pcm_open
);
40 MAKE_FUNC(snd_pcm_close
);
41 MAKE_FUNC(snd_pcm_nonblock
);
42 MAKE_FUNC(snd_pcm_frames_to_bytes
);
43 MAKE_FUNC(snd_pcm_bytes_to_frames
);
44 MAKE_FUNC(snd_pcm_hw_params_malloc
);
45 MAKE_FUNC(snd_pcm_hw_params_free
);
46 MAKE_FUNC(snd_pcm_hw_params_any
);
47 MAKE_FUNC(snd_pcm_hw_params_current
);
48 MAKE_FUNC(snd_pcm_hw_params_set_access
);
49 MAKE_FUNC(snd_pcm_hw_params_set_format
);
50 MAKE_FUNC(snd_pcm_hw_params_set_channels
);
51 MAKE_FUNC(snd_pcm_hw_params_set_periods_near
);
52 MAKE_FUNC(snd_pcm_hw_params_set_rate_near
);
53 MAKE_FUNC(snd_pcm_hw_params_set_rate
);
54 MAKE_FUNC(snd_pcm_hw_params_set_rate_resample
);
55 MAKE_FUNC(snd_pcm_hw_params_set_buffer_time_near
);
56 MAKE_FUNC(snd_pcm_hw_params_set_period_time_near
);
57 MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_near
);
58 MAKE_FUNC(snd_pcm_hw_params_set_period_size_near
);
59 MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_min
);
60 MAKE_FUNC(snd_pcm_hw_params_get_buffer_time_min
);
61 MAKE_FUNC(snd_pcm_hw_params_get_buffer_time_max
);
62 MAKE_FUNC(snd_pcm_hw_params_get_period_time_min
);
63 MAKE_FUNC(snd_pcm_hw_params_get_period_time_max
);
64 MAKE_FUNC(snd_pcm_hw_params_get_buffer_size
);
65 MAKE_FUNC(snd_pcm_hw_params_get_period_size
);
66 MAKE_FUNC(snd_pcm_hw_params_get_access
);
67 MAKE_FUNC(snd_pcm_hw_params_get_periods
);
68 MAKE_FUNC(snd_pcm_hw_params_test_format
);
69 MAKE_FUNC(snd_pcm_hw_params_test_channels
);
70 MAKE_FUNC(snd_pcm_hw_params
);
71 MAKE_FUNC(snd_pcm_sw_params_malloc
);
72 MAKE_FUNC(snd_pcm_sw_params_current
);
73 MAKE_FUNC(snd_pcm_sw_params_set_avail_min
);
74 MAKE_FUNC(snd_pcm_sw_params_set_stop_threshold
);
75 MAKE_FUNC(snd_pcm_sw_params
);
76 MAKE_FUNC(snd_pcm_sw_params_free
);
77 MAKE_FUNC(snd_pcm_prepare
);
78 MAKE_FUNC(snd_pcm_start
);
79 MAKE_FUNC(snd_pcm_resume
);
80 MAKE_FUNC(snd_pcm_reset
);
81 MAKE_FUNC(snd_pcm_wait
);
82 MAKE_FUNC(snd_pcm_delay
);
83 MAKE_FUNC(snd_pcm_state
);
84 MAKE_FUNC(snd_pcm_avail_update
);
85 MAKE_FUNC(snd_pcm_areas_silence
);
86 MAKE_FUNC(snd_pcm_mmap_begin
);
87 MAKE_FUNC(snd_pcm_mmap_commit
);
88 MAKE_FUNC(snd_pcm_readi
);
89 MAKE_FUNC(snd_pcm_writei
);
90 MAKE_FUNC(snd_pcm_drain
);
91 MAKE_FUNC(snd_pcm_drop
);
92 MAKE_FUNC(snd_pcm_recover
);
93 MAKE_FUNC(snd_pcm_info_malloc
);
94 MAKE_FUNC(snd_pcm_info_free
);
95 MAKE_FUNC(snd_pcm_info_set_device
);
96 MAKE_FUNC(snd_pcm_info_set_subdevice
);
97 MAKE_FUNC(snd_pcm_info_set_stream
);
98 MAKE_FUNC(snd_pcm_info_get_name
);
99 MAKE_FUNC(snd_ctl_pcm_next_device
);
100 MAKE_FUNC(snd_ctl_pcm_info
);
101 MAKE_FUNC(snd_ctl_open
);
102 MAKE_FUNC(snd_ctl_close
);
103 MAKE_FUNC(snd_ctl_card_info_malloc
);
104 MAKE_FUNC(snd_ctl_card_info_free
);
105 MAKE_FUNC(snd_ctl_card_info
);
106 MAKE_FUNC(snd_ctl_card_info_get_name
);
107 MAKE_FUNC(snd_ctl_card_info_get_id
);
108 MAKE_FUNC(snd_card_next
);
111 #define snd_strerror psnd_strerror
112 #define snd_pcm_open psnd_pcm_open
113 #define snd_pcm_close psnd_pcm_close
114 #define snd_pcm_nonblock psnd_pcm_nonblock
115 #define snd_pcm_frames_to_bytes psnd_pcm_frames_to_bytes
116 #define snd_pcm_bytes_to_frames psnd_pcm_bytes_to_frames
117 #define snd_pcm_hw_params_malloc psnd_pcm_hw_params_malloc
118 #define snd_pcm_hw_params_free psnd_pcm_hw_params_free
119 #define snd_pcm_hw_params_any psnd_pcm_hw_params_any
120 #define snd_pcm_hw_params_current psnd_pcm_hw_params_current
121 #define snd_pcm_hw_params_set_access psnd_pcm_hw_params_set_access
122 #define snd_pcm_hw_params_set_format psnd_pcm_hw_params_set_format
123 #define snd_pcm_hw_params_set_channels psnd_pcm_hw_params_set_channels
124 #define snd_pcm_hw_params_set_periods_near psnd_pcm_hw_params_set_periods_near
125 #define snd_pcm_hw_params_set_rate_near psnd_pcm_hw_params_set_rate_near
126 #define snd_pcm_hw_params_set_rate psnd_pcm_hw_params_set_rate
127 #define snd_pcm_hw_params_set_rate_resample psnd_pcm_hw_params_set_rate_resample
128 #define snd_pcm_hw_params_set_buffer_time_near psnd_pcm_hw_params_set_buffer_time_near
129 #define snd_pcm_hw_params_set_period_time_near psnd_pcm_hw_params_set_period_time_near
130 #define snd_pcm_hw_params_set_buffer_size_near psnd_pcm_hw_params_set_buffer_size_near
131 #define snd_pcm_hw_params_set_period_size_near psnd_pcm_hw_params_set_period_size_near
132 #define snd_pcm_hw_params_set_buffer_size_min psnd_pcm_hw_params_set_buffer_size_min
133 #define snd_pcm_hw_params_get_buffer_time_min psnd_pcm_hw_params_get_buffer_time_min
134 #define snd_pcm_hw_params_get_buffer_time_max psnd_pcm_hw_params_get_buffer_time_max
135 #define snd_pcm_hw_params_get_period_time_min psnd_pcm_hw_params_get_period_time_min
136 #define snd_pcm_hw_params_get_period_time_max psnd_pcm_hw_params_get_period_time_max
137 #define snd_pcm_hw_params_get_buffer_size psnd_pcm_hw_params_get_buffer_size
138 #define snd_pcm_hw_params_get_period_size psnd_pcm_hw_params_get_period_size
139 #define snd_pcm_hw_params_get_access psnd_pcm_hw_params_get_access
140 #define snd_pcm_hw_params_get_periods psnd_pcm_hw_params_get_periods
141 #define snd_pcm_hw_params_test_format psnd_pcm_hw_params_test_format
142 #define snd_pcm_hw_params_test_channels psnd_pcm_hw_params_test_channels
143 #define snd_pcm_hw_params psnd_pcm_hw_params
144 #define snd_pcm_sw_params_malloc psnd_pcm_sw_params_malloc
145 #define snd_pcm_sw_params_current psnd_pcm_sw_params_current
146 #define snd_pcm_sw_params_set_avail_min psnd_pcm_sw_params_set_avail_min
147 #define snd_pcm_sw_params_set_stop_threshold psnd_pcm_sw_params_set_stop_threshold
148 #define snd_pcm_sw_params psnd_pcm_sw_params
149 #define snd_pcm_sw_params_free psnd_pcm_sw_params_free
150 #define snd_pcm_prepare psnd_pcm_prepare
151 #define snd_pcm_start psnd_pcm_start
152 #define snd_pcm_resume psnd_pcm_resume
153 #define snd_pcm_reset psnd_pcm_reset
154 #define snd_pcm_wait psnd_pcm_wait
155 #define snd_pcm_delay psnd_pcm_delay
156 #define snd_pcm_state psnd_pcm_state
157 #define snd_pcm_avail_update psnd_pcm_avail_update
158 #define snd_pcm_areas_silence psnd_pcm_areas_silence
159 #define snd_pcm_mmap_begin psnd_pcm_mmap_begin
160 #define snd_pcm_mmap_commit psnd_pcm_mmap_commit
161 #define snd_pcm_readi psnd_pcm_readi
162 #define snd_pcm_writei psnd_pcm_writei
163 #define snd_pcm_drain psnd_pcm_drain
164 #define snd_pcm_drop psnd_pcm_drop
165 #define snd_pcm_recover psnd_pcm_recover
166 #define snd_pcm_info_malloc psnd_pcm_info_malloc
167 #define snd_pcm_info_free psnd_pcm_info_free
168 #define snd_pcm_info_set_device psnd_pcm_info_set_device
169 #define snd_pcm_info_set_subdevice psnd_pcm_info_set_subdevice
170 #define snd_pcm_info_set_stream psnd_pcm_info_set_stream
171 #define snd_pcm_info_get_name psnd_pcm_info_get_name
172 #define snd_ctl_pcm_next_device psnd_ctl_pcm_next_device
173 #define snd_ctl_pcm_info psnd_ctl_pcm_info
174 #define snd_ctl_open psnd_ctl_open
175 #define snd_ctl_close psnd_ctl_close
176 #define snd_ctl_card_info_malloc psnd_ctl_card_info_malloc
177 #define snd_ctl_card_info_free psnd_ctl_card_info_free
178 #define snd_ctl_card_info psnd_ctl_card_info
179 #define snd_ctl_card_info_get_name psnd_ctl_card_info_get_name
180 #define snd_ctl_card_info_get_id psnd_ctl_card_info_get_id
181 #define snd_card_next psnd_card_next
185 static ALCboolean
alsa_load(void)
190 alsa_handle
= LoadLib("libasound.so.2");
194 #define LOAD_FUNC(f) do { \
195 p##f = GetSymbol(alsa_handle, #f); \
197 CloseLib(alsa_handle); \
198 alsa_handle = NULL; \
202 LOAD_FUNC(snd_strerror
);
203 LOAD_FUNC(snd_pcm_open
);
204 LOAD_FUNC(snd_pcm_close
);
205 LOAD_FUNC(snd_pcm_nonblock
);
206 LOAD_FUNC(snd_pcm_frames_to_bytes
);
207 LOAD_FUNC(snd_pcm_bytes_to_frames
);
208 LOAD_FUNC(snd_pcm_hw_params_malloc
);
209 LOAD_FUNC(snd_pcm_hw_params_free
);
210 LOAD_FUNC(snd_pcm_hw_params_any
);
211 LOAD_FUNC(snd_pcm_hw_params_current
);
212 LOAD_FUNC(snd_pcm_hw_params_set_access
);
213 LOAD_FUNC(snd_pcm_hw_params_set_format
);
214 LOAD_FUNC(snd_pcm_hw_params_set_channels
);
215 LOAD_FUNC(snd_pcm_hw_params_set_periods_near
);
216 LOAD_FUNC(snd_pcm_hw_params_set_rate_near
);
217 LOAD_FUNC(snd_pcm_hw_params_set_rate
);
218 LOAD_FUNC(snd_pcm_hw_params_set_rate_resample
);
219 LOAD_FUNC(snd_pcm_hw_params_set_buffer_time_near
);
220 LOAD_FUNC(snd_pcm_hw_params_set_period_time_near
);
221 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_near
);
222 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_min
);
223 LOAD_FUNC(snd_pcm_hw_params_set_period_size_near
);
224 LOAD_FUNC(snd_pcm_hw_params_get_buffer_time_min
);
225 LOAD_FUNC(snd_pcm_hw_params_get_buffer_time_max
);
226 LOAD_FUNC(snd_pcm_hw_params_get_period_time_min
);
227 LOAD_FUNC(snd_pcm_hw_params_get_period_time_max
);
228 LOAD_FUNC(snd_pcm_hw_params_get_buffer_size
);
229 LOAD_FUNC(snd_pcm_hw_params_get_period_size
);
230 LOAD_FUNC(snd_pcm_hw_params_get_access
);
231 LOAD_FUNC(snd_pcm_hw_params_get_periods
);
232 LOAD_FUNC(snd_pcm_hw_params_test_format
);
233 LOAD_FUNC(snd_pcm_hw_params_test_channels
);
234 LOAD_FUNC(snd_pcm_hw_params
);
235 LOAD_FUNC(snd_pcm_sw_params_malloc
);
236 LOAD_FUNC(snd_pcm_sw_params_current
);
237 LOAD_FUNC(snd_pcm_sw_params_set_avail_min
);
238 LOAD_FUNC(snd_pcm_sw_params_set_stop_threshold
);
239 LOAD_FUNC(snd_pcm_sw_params
);
240 LOAD_FUNC(snd_pcm_sw_params_free
);
241 LOAD_FUNC(snd_pcm_prepare
);
242 LOAD_FUNC(snd_pcm_start
);
243 LOAD_FUNC(snd_pcm_resume
);
244 LOAD_FUNC(snd_pcm_reset
);
245 LOAD_FUNC(snd_pcm_wait
);
246 LOAD_FUNC(snd_pcm_delay
);
247 LOAD_FUNC(snd_pcm_state
);
248 LOAD_FUNC(snd_pcm_avail_update
);
249 LOAD_FUNC(snd_pcm_areas_silence
);
250 LOAD_FUNC(snd_pcm_mmap_begin
);
251 LOAD_FUNC(snd_pcm_mmap_commit
);
252 LOAD_FUNC(snd_pcm_readi
);
253 LOAD_FUNC(snd_pcm_writei
);
254 LOAD_FUNC(snd_pcm_drain
);
255 LOAD_FUNC(snd_pcm_drop
);
256 LOAD_FUNC(snd_pcm_recover
);
257 LOAD_FUNC(snd_pcm_info_malloc
);
258 LOAD_FUNC(snd_pcm_info_free
);
259 LOAD_FUNC(snd_pcm_info_set_device
);
260 LOAD_FUNC(snd_pcm_info_set_subdevice
);
261 LOAD_FUNC(snd_pcm_info_set_stream
);
262 LOAD_FUNC(snd_pcm_info_get_name
);
263 LOAD_FUNC(snd_ctl_pcm_next_device
);
264 LOAD_FUNC(snd_ctl_pcm_info
);
265 LOAD_FUNC(snd_ctl_open
);
266 LOAD_FUNC(snd_ctl_close
);
267 LOAD_FUNC(snd_ctl_card_info_malloc
);
268 LOAD_FUNC(snd_ctl_card_info_free
);
269 LOAD_FUNC(snd_ctl_card_info
);
270 LOAD_FUNC(snd_ctl_card_info_get_name
);
271 LOAD_FUNC(snd_ctl_card_info_get_id
);
272 LOAD_FUNC(snd_card_next
);
281 snd_pcm_t
*pcmHandle
;
289 snd_pcm_sframes_t last_avail
;
291 volatile int killNow
;
300 static DevMap
*allDevNameMap
;
301 static ALuint numDevNames
;
302 static DevMap
*allCaptureDevNameMap
;
303 static ALuint numCaptureDevNames
;
306 static const char *prefix_name(snd_pcm_stream_t stream
)
308 assert(stream
== SND_PCM_STREAM_PLAYBACK
|| stream
== SND_PCM_STREAM_CAPTURE
);
309 return (stream
==SND_PCM_STREAM_PLAYBACK
) ? "device-prefix" : "capture-prefix";
312 static DevMap
*probe_devices(snd_pcm_stream_t stream
, ALuint
*count
)
314 const char *main_prefix
= "plughw:";
316 int card
, err
, dev
, idx
;
317 snd_ctl_card_info_t
*info
;
318 snd_pcm_info_t
*pcminfo
;
321 snd_ctl_card_info_malloc(&info
);
322 snd_pcm_info_malloc(&pcminfo
);
324 DevList
= malloc(sizeof(DevMap
) * 1);
325 DevList
[0].name
= strdup(alsaDevice
);
326 DevList
[0].device
= strdup(GetConfigValue("alsa", (stream
==SND_PCM_STREAM_PLAYBACK
) ?
327 "device" : "capture", "default"));
331 if((err
=snd_card_next(&card
)) < 0)
332 ERR("Failed to find a card: %s\n", snd_strerror(err
));
333 ConfigValueStr("alsa", prefix_name(stream
), &main_prefix
);
336 const char *card_prefix
= main_prefix
;
337 const char *cardname
, *cardid
;
340 snprintf(name
, sizeof(name
), "hw:%d", card
);
341 if((err
= snd_ctl_open(&handle
, name
, 0)) < 0)
343 ERR("control open (hw:%d): %s\n", card
, snd_strerror(err
));
346 if((err
= snd_ctl_card_info(handle
, info
)) < 0)
348 ERR("control hardware info (hw:%d): %s\n", card
, snd_strerror(err
));
349 snd_ctl_close(handle
);
353 cardname
= snd_ctl_card_info_get_name(info
);
354 cardid
= snd_ctl_card_info_get_id(info
);
356 snprintf(name
, sizeof(name
), "%s-%s", prefix_name(stream
), cardid
);
357 ConfigValueStr("alsa", name
, &card_prefix
);
365 if(snd_ctl_pcm_next_device(handle
, &dev
) < 0)
366 ERR("snd_ctl_pcm_next_device failed\n");
370 snd_pcm_info_set_device(pcminfo
, dev
);
371 snd_pcm_info_set_subdevice(pcminfo
, 0);
372 snd_pcm_info_set_stream(pcminfo
, stream
);
373 if((err
= snd_ctl_pcm_info(handle
, pcminfo
)) < 0) {
375 ERR("control digital audio info (hw:%d): %s\n", card
, snd_strerror(err
));
379 temp
= realloc(DevList
, sizeof(DevMap
) * (idx
+1));
382 const char *device_prefix
= card_prefix
;
386 devname
= snd_pcm_info_get_name(pcminfo
);
388 snprintf(name
, sizeof(name
), "%s-%s-%d", prefix_name(stream
), cardid
, dev
);
389 ConfigValueStr("alsa", name
, &device_prefix
);
391 snprintf(name
, sizeof(name
), "%s, %s (CARD=%s,DEV=%d)",
392 cardname
, devname
, cardid
, dev
);
393 snprintf(device
, sizeof(device
), "%sCARD=%s,DEV=%d",
394 device_prefix
, cardid
, dev
);
396 TRACE("Got device \"%s\", \"%s\"\n", name
, device
);
397 DevList
[idx
].name
= strdup(name
);
398 DevList
[idx
].device
= strdup(device
);
402 snd_ctl_close(handle
);
404 if(snd_card_next(&card
) < 0) {
405 ERR("snd_card_next failed\n");
410 snd_pcm_info_free(pcminfo
);
411 snd_ctl_card_info_free(info
);
418 static int verify_state(snd_pcm_t
*handle
)
420 snd_pcm_state_t state
= snd_pcm_state(handle
);
425 case SND_PCM_STATE_OPEN
:
426 case SND_PCM_STATE_SETUP
:
427 case SND_PCM_STATE_PREPARED
:
428 case SND_PCM_STATE_RUNNING
:
429 case SND_PCM_STATE_DRAINING
:
430 case SND_PCM_STATE_PAUSED
:
434 case SND_PCM_STATE_XRUN
:
435 if((err
=snd_pcm_recover(handle
, -EPIPE
, 1)) < 0)
438 case SND_PCM_STATE_SUSPENDED
:
439 if((err
=snd_pcm_recover(handle
, -ESTRPIPE
, 1)) < 0)
442 case SND_PCM_STATE_DISCONNECTED
:
450 static ALuint
ALSAProc(ALvoid
*ptr
)
452 ALCdevice
*Device
= (ALCdevice
*)ptr
;
453 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
454 const snd_pcm_channel_area_t
*areas
= NULL
;
455 snd_pcm_uframes_t update_size
, num_updates
;
456 snd_pcm_sframes_t avail
, commitres
;
457 snd_pcm_uframes_t offset
, frames
;
463 update_size
= Device
->UpdateSize
;
464 num_updates
= Device
->NumUpdates
;
465 while(!data
->killNow
)
467 int state
= verify_state(data
->pcmHandle
);
470 ERR("Invalid state detected: %s\n", snd_strerror(state
));
471 aluHandleDisconnect(Device
);
475 avail
= snd_pcm_avail_update(data
->pcmHandle
);
478 ERR("available update failed: %s\n", snd_strerror(avail
));
482 if((snd_pcm_uframes_t
)avail
> update_size
*(num_updates
+1))
484 WARN("available samples exceeds the buffer size\n");
485 snd_pcm_reset(data
->pcmHandle
);
489 // make sure there's frames to process
490 if((snd_pcm_uframes_t
)avail
< update_size
)
492 if(state
!= SND_PCM_STATE_RUNNING
)
494 err
= snd_pcm_start(data
->pcmHandle
);
497 ERR("start failed: %s\n", snd_strerror(err
));
501 if(snd_pcm_wait(data
->pcmHandle
, 1000) == 0)
502 ERR("Wait timeout... buffer size too low?\n");
505 avail
-= avail
%update_size
;
507 // it is possible that contiguous areas are smaller, thus we use a loop
512 err
= snd_pcm_mmap_begin(data
->pcmHandle
, &areas
, &offset
, &frames
);
515 ERR("mmap begin error: %s\n", snd_strerror(err
));
519 WritePtr
= (char*)areas
->addr
+ (offset
* areas
->step
/ 8);
520 aluMixData(Device
, WritePtr
, frames
);
522 commitres
= snd_pcm_mmap_commit(data
->pcmHandle
, offset
, frames
);
523 if(commitres
< 0 || (commitres
-frames
) != 0)
525 ERR("mmap commit error: %s\n",
526 snd_strerror(commitres
>= 0 ? -EPIPE
: commitres
));
537 static ALuint
ALSANoMMapProc(ALvoid
*ptr
)
539 ALCdevice
*Device
= (ALCdevice
*)ptr
;
540 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
541 snd_pcm_sframes_t avail
;
546 while(!data
->killNow
)
548 int state
= verify_state(data
->pcmHandle
);
551 ERR("Invalid state detected: %s\n", snd_strerror(state
));
552 aluHandleDisconnect(Device
);
556 WritePtr
= data
->buffer
;
557 avail
= data
->size
/ snd_pcm_frames_to_bytes(data
->pcmHandle
, 1);
558 aluMixData(Device
, WritePtr
, avail
);
562 int ret
= snd_pcm_writei(data
->pcmHandle
, WritePtr
, avail
);
570 ret
= snd_pcm_recover(data
->pcmHandle
, ret
, 1);
577 WritePtr
+= snd_pcm_frames_to_bytes(data
->pcmHandle
, ret
);
584 ret
= snd_pcm_prepare(data
->pcmHandle
);
594 static ALCenum
alsa_open_playback(ALCdevice
*device
, const ALCchar
*deviceName
)
596 const char *driver
= NULL
;
605 allDevNameMap
= probe_devices(SND_PCM_STREAM_PLAYBACK
, &numDevNames
);
607 for(idx
= 0;idx
< numDevNames
;idx
++)
609 if(strcmp(deviceName
, allDevNameMap
[idx
].name
) == 0)
611 driver
= allDevNameMap
[idx
].device
;
615 if(idx
== numDevNames
)
616 return ALC_INVALID_VALUE
;
620 deviceName
= alsaDevice
;
621 driver
= GetConfigValue("alsa", "device", "default");
624 data
= (alsa_data
*)calloc(1, sizeof(alsa_data
));
626 err
= snd_pcm_open(&data
->pcmHandle
, driver
, SND_PCM_STREAM_PLAYBACK
, SND_PCM_NONBLOCK
);
629 err
= snd_pcm_nonblock(data
->pcmHandle
, 0);
630 if(err
< 0) snd_pcm_close(data
->pcmHandle
);
635 ERR("Could not open playback device '%s': %s\n", driver
, snd_strerror(err
));
636 return ALC_OUT_OF_MEMORY
;
639 device
->DeviceName
= strdup(deviceName
);
640 device
->ExtraData
= data
;
644 static void alsa_close_playback(ALCdevice
*device
)
646 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
648 snd_pcm_close(data
->pcmHandle
);
650 device
->ExtraData
= NULL
;
653 static ALCboolean
alsa_reset_playback(ALCdevice
*device
)
655 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
656 snd_pcm_uframes_t periodSizeInFrames
;
657 unsigned int periodLen
, bufferLen
;
658 snd_pcm_sw_params_t
*sp
= NULL
;
659 snd_pcm_hw_params_t
*hp
= NULL
;
660 snd_pcm_access_t access
;
661 snd_pcm_format_t format
;
662 unsigned int periods
;
669 switch(device
->FmtType
)
672 format
= SND_PCM_FORMAT_S8
;
675 format
= SND_PCM_FORMAT_U8
;
678 format
= SND_PCM_FORMAT_S16
;
681 format
= SND_PCM_FORMAT_U16
;
684 format
= SND_PCM_FORMAT_S32
;
687 format
= SND_PCM_FORMAT_U32
;
690 format
= SND_PCM_FORMAT_FLOAT
;
694 allowmmap
= GetConfigValueBool("alsa", "mmap", 1);
695 periods
= device
->NumUpdates
;
696 periodLen
= (ALuint64
)device
->UpdateSize
* 1000000 / device
->Frequency
;
697 bufferLen
= periodLen
* periods
;
698 rate
= device
->Frequency
;
700 snd_pcm_hw_params_malloc(&hp
);
701 #define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error
702 CHECK(snd_pcm_hw_params_any(data
->pcmHandle
, hp
));
703 /* set interleaved access */
704 if(!allowmmap
|| snd_pcm_hw_params_set_access(data
->pcmHandle
, hp
, SND_PCM_ACCESS_MMAP_INTERLEAVED
) < 0)
709 bufferLen
= periodLen
* periods
;
711 CHECK(snd_pcm_hw_params_set_access(data
->pcmHandle
, hp
, SND_PCM_ACCESS_RW_INTERLEAVED
));
713 /* test and set format (implicitly sets sample bits) */
714 if(snd_pcm_hw_params_test_format(data
->pcmHandle
, hp
, format
) < 0)
716 static const struct {
717 snd_pcm_format_t format
;
718 enum DevFmtType fmttype
;
720 { SND_PCM_FORMAT_FLOAT
, DevFmtFloat
},
721 { SND_PCM_FORMAT_S32
, DevFmtInt
},
722 { SND_PCM_FORMAT_U32
, DevFmtUInt
},
723 { SND_PCM_FORMAT_S16
, DevFmtShort
},
724 { SND_PCM_FORMAT_U16
, DevFmtUShort
},
725 { SND_PCM_FORMAT_S8
, DevFmtByte
},
726 { SND_PCM_FORMAT_U8
, DevFmtUByte
},
730 for(k
= 0;k
< COUNTOF(formatlist
);k
++)
732 format
= formatlist
[k
].format
;
733 if(snd_pcm_hw_params_test_format(data
->pcmHandle
, hp
, format
) >= 0)
735 device
->FmtType
= formatlist
[k
].fmttype
;
740 CHECK(snd_pcm_hw_params_set_format(data
->pcmHandle
, hp
, format
));
741 /* test and set channels (implicitly sets frame bits) */
742 if(snd_pcm_hw_params_test_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(device
->FmtChans
)) < 0)
744 static const enum DevFmtChannels channellist
[] = {
753 for(k
= 0;k
< COUNTOF(channellist
);k
++)
755 if(snd_pcm_hw_params_test_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(channellist
[k
])) >= 0)
757 device
->FmtChans
= channellist
[k
];
762 CHECK(snd_pcm_hw_params_set_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(device
->FmtChans
)));
763 /* set rate (implicitly constrains period/buffer parameters) */
764 if(snd_pcm_hw_params_set_rate_resample(data
->pcmHandle
, hp
, 0) < 0)
765 ERR("Failed to disable ALSA resampler\n");
766 CHECK(snd_pcm_hw_params_set_rate_near(data
->pcmHandle
, hp
, &rate
, NULL
));
767 /* set buffer time (implicitly constrains period/buffer parameters) */
768 if(snd_pcm_hw_params_set_buffer_time_near(data
->pcmHandle
, hp
, &bufferLen
, NULL
) < 0)
769 ERR("snd_pcm_hw_params_set_buffer_time_near failed: %s\n", snd_strerror(err
));
770 /* set period time (implicitly sets buffer size/bytes/time and period size/bytes) */
771 if(snd_pcm_hw_params_set_period_time_near(data
->pcmHandle
, hp
, &periodLen
, NULL
) < 0)
772 ERR("snd_pcm_hw_params_set_period_time_near failed: %s\n", snd_strerror(err
));
773 /* install and prepare hardware configuration */
774 CHECK(snd_pcm_hw_params(data
->pcmHandle
, hp
));
775 /* retrieve configuration info */
776 CHECK(snd_pcm_hw_params_get_access(hp
, &access
));
777 CHECK(snd_pcm_hw_params_get_period_size(hp
, &periodSizeInFrames
, NULL
));
778 CHECK(snd_pcm_hw_params_get_periods(hp
, &periods
, NULL
));
780 snd_pcm_hw_params_free(hp
);
782 snd_pcm_sw_params_malloc(&sp
);
784 CHECK(snd_pcm_sw_params_current(data
->pcmHandle
, sp
));
785 CHECK(snd_pcm_sw_params_set_avail_min(data
->pcmHandle
, sp
, periodSizeInFrames
));
786 CHECK(snd_pcm_sw_params_set_stop_threshold(data
->pcmHandle
, sp
, periodSizeInFrames
*periods
));
787 CHECK(snd_pcm_sw_params(data
->pcmHandle
, sp
));
789 snd_pcm_sw_params_free(sp
);
792 /* Increase periods by one, since the temp buffer counts as an extra
794 if(access
== SND_PCM_ACCESS_RW_INTERLEAVED
)
795 device
->NumUpdates
= periods
+1;
797 device
->NumUpdates
= periods
;
798 device
->UpdateSize
= periodSizeInFrames
;
799 device
->Frequency
= rate
;
801 SetDefaultChannelOrder(device
);
806 ERR("%s failed: %s\n", funcerr
, snd_strerror(err
));
807 if(hp
) snd_pcm_hw_params_free(hp
);
808 if(sp
) snd_pcm_sw_params_free(sp
);
812 static ALCboolean
alsa_start_playback(ALCdevice
*device
)
814 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
815 snd_pcm_hw_params_t
*hp
= NULL
;
816 snd_pcm_access_t access
;
820 snd_pcm_hw_params_malloc(&hp
);
821 #define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error
822 CHECK(snd_pcm_hw_params_current(data
->pcmHandle
, hp
));
823 /* retrieve configuration info */
824 CHECK(snd_pcm_hw_params_get_access(hp
, &access
));
826 snd_pcm_hw_params_free(hp
);
829 data
->size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, device
->UpdateSize
);
830 if(access
== SND_PCM_ACCESS_RW_INTERLEAVED
)
832 data
->buffer
= malloc(data
->size
);
835 ERR("buffer malloc failed\n");
838 data
->thread
= StartThread(ALSANoMMapProc
, device
);
842 err
= snd_pcm_prepare(data
->pcmHandle
);
845 ERR("snd_pcm_prepare(data->pcmHandle) failed: %s\n", snd_strerror(err
));
848 data
->thread
= StartThread(ALSAProc
, device
);
850 if(data
->thread
== NULL
)
852 ERR("Could not create playback thread\n");
861 ERR("%s failed: %s\n", funcerr
, snd_strerror(err
));
862 if(hp
) snd_pcm_hw_params_free(hp
);
866 static void alsa_stop_playback(ALCdevice
*device
)
868 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
873 StopThread(data
->thread
);
882 static ALCenum
alsa_open_capture(ALCdevice
*Device
, const ALCchar
*deviceName
)
884 const char *driver
= NULL
;
885 snd_pcm_hw_params_t
*hp
;
886 snd_pcm_uframes_t bufferSizeInFrames
;
887 snd_pcm_uframes_t periodSizeInFrames
;
888 ALboolean needring
= AL_FALSE
;
889 snd_pcm_format_t format
;
898 if(!allCaptureDevNameMap
)
899 allCaptureDevNameMap
= probe_devices(SND_PCM_STREAM_CAPTURE
, &numCaptureDevNames
);
901 for(idx
= 0;idx
< numCaptureDevNames
;idx
++)
903 if(strcmp(deviceName
, allCaptureDevNameMap
[idx
].name
) == 0)
905 driver
= allCaptureDevNameMap
[idx
].device
;
909 if(idx
== numCaptureDevNames
)
910 return ALC_INVALID_VALUE
;
914 deviceName
= alsaDevice
;
915 driver
= GetConfigValue("alsa", "capture", "default");
918 data
= (alsa_data
*)calloc(1, sizeof(alsa_data
));
920 err
= snd_pcm_open(&data
->pcmHandle
, driver
, SND_PCM_STREAM_CAPTURE
, SND_PCM_NONBLOCK
);
923 ERR("Could not open capture device '%s': %s\n", driver
, snd_strerror(err
));
925 return ALC_INVALID_VALUE
;
929 switch(Device
->FmtType
)
932 format
= SND_PCM_FORMAT_S8
;
935 format
= SND_PCM_FORMAT_U8
;
938 format
= SND_PCM_FORMAT_S16
;
941 format
= SND_PCM_FORMAT_U16
;
944 format
= SND_PCM_FORMAT_S32
;
947 format
= SND_PCM_FORMAT_U32
;
950 format
= SND_PCM_FORMAT_FLOAT
;
955 bufferSizeInFrames
= maxu(Device
->UpdateSize
*Device
->NumUpdates
,
956 100*Device
->Frequency
/1000);
957 periodSizeInFrames
= minu(bufferSizeInFrames
, 25*Device
->Frequency
/1000);
959 snd_pcm_hw_params_malloc(&hp
);
960 #define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error
961 CHECK(snd_pcm_hw_params_any(data
->pcmHandle
, hp
));
962 /* set interleaved access */
963 CHECK(snd_pcm_hw_params_set_access(data
->pcmHandle
, hp
, SND_PCM_ACCESS_RW_INTERLEAVED
));
964 /* set format (implicitly sets sample bits) */
965 CHECK(snd_pcm_hw_params_set_format(data
->pcmHandle
, hp
, format
));
966 /* set channels (implicitly sets frame bits) */
967 CHECK(snd_pcm_hw_params_set_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(Device
->FmtChans
)));
968 /* set rate (implicitly constrains period/buffer parameters) */
969 CHECK(snd_pcm_hw_params_set_rate(data
->pcmHandle
, hp
, Device
->Frequency
, 0));
970 /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
971 if(snd_pcm_hw_params_set_buffer_size_min(data
->pcmHandle
, hp
, &bufferSizeInFrames
) < 0)
973 TRACE("Buffer too large, using intermediate ring buffer\n");
975 CHECK(snd_pcm_hw_params_set_buffer_size_near(data
->pcmHandle
, hp
, &bufferSizeInFrames
));
977 /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
978 CHECK(snd_pcm_hw_params_set_period_size_near(data
->pcmHandle
, hp
, &periodSizeInFrames
, NULL
));
979 /* install and prepare hardware configuration */
980 CHECK(snd_pcm_hw_params(data
->pcmHandle
, hp
));
981 /* retrieve configuration info */
982 CHECK(snd_pcm_hw_params_get_period_size(hp
, &periodSizeInFrames
, NULL
));
984 snd_pcm_hw_params_free(hp
);
989 data
->ring
= CreateRingBuffer(FrameSizeFromDevFmt(Device
->FmtChans
, Device
->FmtType
),
990 Device
->UpdateSize
*Device
->NumUpdates
);
993 ERR("ring buffer create failed\n");
997 data
->size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, periodSizeInFrames
);
998 data
->buffer
= malloc(data
->size
);
1001 ERR("buffer malloc failed\n");
1006 Device
->DeviceName
= strdup(deviceName
);
1008 Device
->ExtraData
= data
;
1009 return ALC_NO_ERROR
;
1012 ERR("%s failed: %s\n", funcerr
, snd_strerror(err
));
1013 if(hp
) snd_pcm_hw_params_free(hp
);
1017 DestroyRingBuffer(data
->ring
);
1018 snd_pcm_close(data
->pcmHandle
);
1021 Device
->ExtraData
= NULL
;
1022 return ALC_INVALID_VALUE
;
1025 static void alsa_close_capture(ALCdevice
*Device
)
1027 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1029 snd_pcm_close(data
->pcmHandle
);
1030 DestroyRingBuffer(data
->ring
);
1034 Device
->ExtraData
= NULL
;
1037 static void alsa_start_capture(ALCdevice
*Device
)
1039 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1042 err
= snd_pcm_start(data
->pcmHandle
);
1045 ERR("start failed: %s\n", snd_strerror(err
));
1046 aluHandleDisconnect(Device
);
1049 data
->doCapture
= AL_TRUE
;
1052 static ALCenum
alsa_capture_samples(ALCdevice
*Device
, ALCvoid
*Buffer
, ALCuint Samples
)
1054 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1058 ReadRingBuffer(data
->ring
, Buffer
, Samples
);
1059 return ALC_NO_ERROR
;
1062 data
->last_avail
-= Samples
;
1063 while(Device
->Connected
&& Samples
> 0)
1065 snd_pcm_sframes_t amt
= 0;
1069 /* First get any data stored from the last stop */
1070 amt
= snd_pcm_bytes_to_frames(data
->pcmHandle
, data
->size
);
1071 if((snd_pcm_uframes_t
)amt
> Samples
) amt
= Samples
;
1073 amt
= snd_pcm_frames_to_bytes(data
->pcmHandle
, amt
);
1074 memmove(Buffer
, data
->buffer
, amt
);
1076 if(data
->size
> amt
)
1078 memmove(data
->buffer
, data
->buffer
+amt
, data
->size
- amt
);
1084 data
->buffer
= NULL
;
1087 amt
= snd_pcm_bytes_to_frames(data
->pcmHandle
, amt
);
1089 else if(data
->doCapture
)
1090 amt
= snd_pcm_readi(data
->pcmHandle
, Buffer
, Samples
);
1093 ERR("read error: %s\n", snd_strerror(amt
));
1097 if((amt
=snd_pcm_recover(data
->pcmHandle
, amt
, 1)) >= 0)
1099 amt
= snd_pcm_start(data
->pcmHandle
);
1101 amt
= snd_pcm_avail_update(data
->pcmHandle
);
1105 ERR("restore error: %s\n", snd_strerror(amt
));
1106 aluHandleDisconnect(Device
);
1109 /* If the amount available is less than what's asked, we lost it
1110 * during recovery. So just give silence instead. */
1111 if((snd_pcm_uframes_t
)amt
< Samples
)
1116 Buffer
= (ALbyte
*)Buffer
+ amt
;
1120 memset(Buffer
, ((Device
->FmtType
== DevFmtUByte
) ? 0x80 : 0),
1121 snd_pcm_frames_to_bytes(data
->pcmHandle
, Samples
));
1123 return ALC_NO_ERROR
;
1126 static ALCuint
alsa_available_samples(ALCdevice
*Device
)
1128 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1129 snd_pcm_sframes_t avail
= 0;
1131 if(Device
->Connected
&& data
->doCapture
)
1132 avail
= snd_pcm_avail_update(data
->pcmHandle
);
1135 ERR("avail update failed: %s\n", snd_strerror(avail
));
1137 if((avail
=snd_pcm_recover(data
->pcmHandle
, avail
, 1)) >= 0)
1140 avail
= snd_pcm_start(data
->pcmHandle
);
1142 avail
= snd_pcm_avail_update(data
->pcmHandle
);
1146 ERR("restore error: %s\n", snd_strerror(avail
));
1147 aluHandleDisconnect(Device
);
1153 if(avail
< 0) avail
= 0;
1154 avail
+= snd_pcm_bytes_to_frames(data
->pcmHandle
, data
->size
);
1155 if(avail
> data
->last_avail
) data
->last_avail
= avail
;
1156 return data
->last_avail
;
1161 snd_pcm_sframes_t amt
;
1163 amt
= snd_pcm_bytes_to_frames(data
->pcmHandle
, data
->size
);
1164 if(avail
< amt
) amt
= avail
;
1166 amt
= snd_pcm_readi(data
->pcmHandle
, data
->buffer
, amt
);
1169 ERR("read error: %s\n", snd_strerror(amt
));
1173 if((amt
=snd_pcm_recover(data
->pcmHandle
, amt
, 1)) >= 0)
1176 amt
= snd_pcm_start(data
->pcmHandle
);
1178 amt
= snd_pcm_avail_update(data
->pcmHandle
);
1182 ERR("restore error: %s\n", snd_strerror(amt
));
1183 aluHandleDisconnect(Device
);
1190 WriteRingBuffer(data
->ring
, data
->buffer
, amt
);
1194 return RingBufferSize(data
->ring
);
1197 static void alsa_stop_capture(ALCdevice
*Device
)
1199 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1203 /* OpenAL requires access to unread audio after stopping, but ALSA's
1204 * snd_pcm_drain is unreliable and snd_pcm_drop drops it. Capture what's
1205 * available now so it'll be available later after the drop. */
1206 avail
= alsa_available_samples(Device
);
1207 if(!data
->ring
&& avail
> 0)
1209 /* The ring buffer implicitly captures when checking availability.
1210 * Direct access needs to explicitly capture it into temp storage. */
1214 size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, avail
);
1215 ptr
= realloc(data
->buffer
, size
);
1219 alsa_capture_samples(Device
, data
->buffer
, avail
);
1223 err
= snd_pcm_drop(data
->pcmHandle
);
1225 ERR("drop failed: %s\n", snd_strerror(err
));
1226 data
->doCapture
= AL_FALSE
;
1230 static ALint64
alsa_get_latency(ALCdevice
*device
)
1232 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
1233 snd_pcm_sframes_t delay
= 0;
1236 if((err
=snd_pcm_delay(data
->pcmHandle
, &delay
)) < 0)
1238 ERR("Failed to get latency!\n");
1241 return maxi64((ALint64
)delay
*1000000000/device
->Frequency
, 0);
1245 static const BackendFuncs alsa_funcs
= {
1247 alsa_close_playback
,
1248 alsa_reset_playback
,
1249 alsa_start_playback
,
1255 alsa_capture_samples
,
1256 alsa_available_samples
,
1260 ALCboolean
alc_alsa_init(BackendFuncs
*func_list
)
1264 *func_list
= alsa_funcs
;
1268 void alc_alsa_deinit(void)
1272 for(i
= 0;i
< numDevNames
;++i
)
1274 free(allDevNameMap
[i
].name
);
1275 free(allDevNameMap
[i
].device
);
1277 free(allDevNameMap
);
1278 allDevNameMap
= NULL
;
1281 for(i
= 0;i
< numCaptureDevNames
;++i
)
1283 free(allCaptureDevNameMap
[i
].name
);
1284 free(allCaptureDevNameMap
[i
].device
);
1286 free(allCaptureDevNameMap
);
1287 allCaptureDevNameMap
= NULL
;
1288 numCaptureDevNames
= 0;
1292 CloseLib(alsa_handle
);
1297 void alc_alsa_probe(enum DevProbe type
)
1303 case ALL_DEVICE_PROBE
:
1304 for(i
= 0;i
< numDevNames
;++i
)
1306 free(allDevNameMap
[i
].name
);
1307 free(allDevNameMap
[i
].device
);
1310 free(allDevNameMap
);
1311 allDevNameMap
= probe_devices(SND_PCM_STREAM_PLAYBACK
, &numDevNames
);
1313 for(i
= 0;i
< numDevNames
;++i
)
1314 AppendAllDevicesList(allDevNameMap
[i
].name
);
1317 case CAPTURE_DEVICE_PROBE
:
1318 for(i
= 0;i
< numCaptureDevNames
;++i
)
1320 free(allCaptureDevNameMap
[i
].name
);
1321 free(allCaptureDevNameMap
[i
].device
);
1324 free(allCaptureDevNameMap
);
1325 allCaptureDevNameMap
= probe_devices(SND_PCM_STREAM_CAPTURE
, &numCaptureDevNames
);
1327 for(i
= 0;i
< numCaptureDevNames
;++i
)
1328 AppendCaptureDeviceList(allCaptureDevNameMap
[i
].name
);