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";
35 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_set_access
);
48 MAKE_FUNC(snd_pcm_hw_params_set_format
);
49 MAKE_FUNC(snd_pcm_hw_params_set_channels
);
50 MAKE_FUNC(snd_pcm_hw_params_set_periods_near
);
51 MAKE_FUNC(snd_pcm_hw_params_set_rate_near
);
52 MAKE_FUNC(snd_pcm_hw_params_set_rate
);
53 MAKE_FUNC(snd_pcm_hw_params_set_rate_resample
);
54 MAKE_FUNC(snd_pcm_hw_params_set_buffer_time_near
);
55 MAKE_FUNC(snd_pcm_hw_params_set_period_time_near
);
56 MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_near
);
57 MAKE_FUNC(snd_pcm_hw_params_set_period_size_near
);
58 MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_min
);
59 MAKE_FUNC(snd_pcm_hw_params_get_buffer_size
);
60 MAKE_FUNC(snd_pcm_hw_params_get_period_size
);
61 MAKE_FUNC(snd_pcm_hw_params_get_access
);
62 MAKE_FUNC(snd_pcm_hw_params_get_periods
);
63 MAKE_FUNC(snd_pcm_hw_params_test_format
);
64 MAKE_FUNC(snd_pcm_hw_params_test_channels
);
65 MAKE_FUNC(snd_pcm_hw_params
);
66 MAKE_FUNC(snd_pcm_sw_params_malloc
);
67 MAKE_FUNC(snd_pcm_sw_params_current
);
68 MAKE_FUNC(snd_pcm_sw_params_set_avail_min
);
69 MAKE_FUNC(snd_pcm_sw_params_set_stop_threshold
);
70 MAKE_FUNC(snd_pcm_sw_params
);
71 MAKE_FUNC(snd_pcm_sw_params_free
);
72 MAKE_FUNC(snd_pcm_prepare
);
73 MAKE_FUNC(snd_pcm_start
);
74 MAKE_FUNC(snd_pcm_resume
);
75 MAKE_FUNC(snd_pcm_reset
);
76 MAKE_FUNC(snd_pcm_wait
);
77 MAKE_FUNC(snd_pcm_state
);
78 MAKE_FUNC(snd_pcm_avail_update
);
79 MAKE_FUNC(snd_pcm_areas_silence
);
80 MAKE_FUNC(snd_pcm_mmap_begin
);
81 MAKE_FUNC(snd_pcm_mmap_commit
);
82 MAKE_FUNC(snd_pcm_readi
);
83 MAKE_FUNC(snd_pcm_writei
);
84 MAKE_FUNC(snd_pcm_drain
);
85 MAKE_FUNC(snd_pcm_drop
);
86 MAKE_FUNC(snd_pcm_recover
);
87 MAKE_FUNC(snd_pcm_info_malloc
);
88 MAKE_FUNC(snd_pcm_info_free
);
89 MAKE_FUNC(snd_pcm_info_set_device
);
90 MAKE_FUNC(snd_pcm_info_set_subdevice
);
91 MAKE_FUNC(snd_pcm_info_set_stream
);
92 MAKE_FUNC(snd_pcm_info_get_name
);
93 MAKE_FUNC(snd_ctl_pcm_next_device
);
94 MAKE_FUNC(snd_ctl_pcm_info
);
95 MAKE_FUNC(snd_ctl_open
);
96 MAKE_FUNC(snd_ctl_close
);
97 MAKE_FUNC(snd_ctl_card_info_malloc
);
98 MAKE_FUNC(snd_ctl_card_info_free
);
99 MAKE_FUNC(snd_ctl_card_info
);
100 MAKE_FUNC(snd_ctl_card_info_get_name
);
101 MAKE_FUNC(snd_ctl_card_info_get_id
);
102 MAKE_FUNC(snd_card_next
);
105 #define snd_strerror psnd_strerror
106 #define snd_pcm_open psnd_pcm_open
107 #define snd_pcm_close psnd_pcm_close
108 #define snd_pcm_nonblock psnd_pcm_nonblock
109 #define snd_pcm_frames_to_bytes psnd_pcm_frames_to_bytes
110 #define snd_pcm_bytes_to_frames psnd_pcm_bytes_to_frames
111 #define snd_pcm_hw_params_malloc psnd_pcm_hw_params_malloc
112 #define snd_pcm_hw_params_free psnd_pcm_hw_params_free
113 #define snd_pcm_hw_params_any psnd_pcm_hw_params_any
114 #define snd_pcm_hw_params_set_access psnd_pcm_hw_params_set_access
115 #define snd_pcm_hw_params_set_format psnd_pcm_hw_params_set_format
116 #define snd_pcm_hw_params_set_channels psnd_pcm_hw_params_set_channels
117 #define snd_pcm_hw_params_set_periods_near psnd_pcm_hw_params_set_periods_near
118 #define snd_pcm_hw_params_set_rate_near psnd_pcm_hw_params_set_rate_near
119 #define snd_pcm_hw_params_set_rate psnd_pcm_hw_params_set_rate
120 #define snd_pcm_hw_params_set_rate_resample psnd_pcm_hw_params_set_rate_resample
121 #define snd_pcm_hw_params_set_buffer_time_near psnd_pcm_hw_params_set_buffer_time_near
122 #define snd_pcm_hw_params_set_period_time_near psnd_pcm_hw_params_set_period_time_near
123 #define snd_pcm_hw_params_set_buffer_size_near psnd_pcm_hw_params_set_buffer_size_near
124 #define snd_pcm_hw_params_set_period_size_near psnd_pcm_hw_params_set_period_size_near
125 #define snd_pcm_hw_params_set_buffer_size_min psnd_pcm_hw_params_set_buffer_size_min
126 #define snd_pcm_hw_params_get_buffer_size psnd_pcm_hw_params_get_buffer_size
127 #define snd_pcm_hw_params_get_period_size psnd_pcm_hw_params_get_period_size
128 #define snd_pcm_hw_params_get_access psnd_pcm_hw_params_get_access
129 #define snd_pcm_hw_params_get_periods psnd_pcm_hw_params_get_periods
130 #define snd_pcm_hw_params_test_format psnd_pcm_hw_params_test_format
131 #define snd_pcm_hw_params_test_channels psnd_pcm_hw_params_test_channels
132 #define snd_pcm_hw_params psnd_pcm_hw_params
133 #define snd_pcm_sw_params_malloc psnd_pcm_sw_params_malloc
134 #define snd_pcm_sw_params_current psnd_pcm_sw_params_current
135 #define snd_pcm_sw_params_set_avail_min psnd_pcm_sw_params_set_avail_min
136 #define snd_pcm_sw_params_set_stop_threshold psnd_pcm_sw_params_set_stop_threshold
137 #define snd_pcm_sw_params psnd_pcm_sw_params
138 #define snd_pcm_sw_params_free psnd_pcm_sw_params_free
139 #define snd_pcm_prepare psnd_pcm_prepare
140 #define snd_pcm_start psnd_pcm_start
141 #define snd_pcm_resume psnd_pcm_resume
142 #define snd_pcm_reset psnd_pcm_reset
143 #define snd_pcm_wait psnd_pcm_wait
144 #define snd_pcm_state psnd_pcm_state
145 #define snd_pcm_avail_update psnd_pcm_avail_update
146 #define snd_pcm_areas_silence psnd_pcm_areas_silence
147 #define snd_pcm_mmap_begin psnd_pcm_mmap_begin
148 #define snd_pcm_mmap_commit psnd_pcm_mmap_commit
149 #define snd_pcm_readi psnd_pcm_readi
150 #define snd_pcm_writei psnd_pcm_writei
151 #define snd_pcm_drain psnd_pcm_drain
152 #define snd_pcm_drop psnd_pcm_drop
153 #define snd_pcm_recover psnd_pcm_recover
154 #define snd_pcm_info_malloc psnd_pcm_info_malloc
155 #define snd_pcm_info_free psnd_pcm_info_free
156 #define snd_pcm_info_set_device psnd_pcm_info_set_device
157 #define snd_pcm_info_set_subdevice psnd_pcm_info_set_subdevice
158 #define snd_pcm_info_set_stream psnd_pcm_info_set_stream
159 #define snd_pcm_info_get_name psnd_pcm_info_get_name
160 #define snd_ctl_pcm_next_device psnd_ctl_pcm_next_device
161 #define snd_ctl_pcm_info psnd_ctl_pcm_info
162 #define snd_ctl_open psnd_ctl_open
163 #define snd_ctl_close psnd_ctl_close
164 #define snd_ctl_card_info_malloc psnd_ctl_card_info_malloc
165 #define snd_ctl_card_info_free psnd_ctl_card_info_free
166 #define snd_ctl_card_info psnd_ctl_card_info
167 #define snd_ctl_card_info_get_name psnd_ctl_card_info_get_name
168 #define snd_ctl_card_info_get_id psnd_ctl_card_info_get_id
169 #define snd_card_next psnd_card_next
173 static ALCboolean
alsa_load(void)
178 alsa_handle
= LoadLib("libasound.so.2");
182 #define LOAD_FUNC(f) do { \
183 p##f = GetSymbol(alsa_handle, #f); \
185 CloseLib(alsa_handle); \
186 alsa_handle = NULL; \
190 LOAD_FUNC(snd_strerror
);
191 LOAD_FUNC(snd_pcm_open
);
192 LOAD_FUNC(snd_pcm_close
);
193 LOAD_FUNC(snd_pcm_nonblock
);
194 LOAD_FUNC(snd_pcm_frames_to_bytes
);
195 LOAD_FUNC(snd_pcm_bytes_to_frames
);
196 LOAD_FUNC(snd_pcm_hw_params_malloc
);
197 LOAD_FUNC(snd_pcm_hw_params_free
);
198 LOAD_FUNC(snd_pcm_hw_params_any
);
199 LOAD_FUNC(snd_pcm_hw_params_set_access
);
200 LOAD_FUNC(snd_pcm_hw_params_set_format
);
201 LOAD_FUNC(snd_pcm_hw_params_set_channels
);
202 LOAD_FUNC(snd_pcm_hw_params_set_periods_near
);
203 LOAD_FUNC(snd_pcm_hw_params_set_rate_near
);
204 LOAD_FUNC(snd_pcm_hw_params_set_rate
);
205 LOAD_FUNC(snd_pcm_hw_params_set_rate_resample
);
206 LOAD_FUNC(snd_pcm_hw_params_set_buffer_time_near
);
207 LOAD_FUNC(snd_pcm_hw_params_set_period_time_near
);
208 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_near
);
209 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_min
);
210 LOAD_FUNC(snd_pcm_hw_params_set_period_size_near
);
211 LOAD_FUNC(snd_pcm_hw_params_get_buffer_size
);
212 LOAD_FUNC(snd_pcm_hw_params_get_period_size
);
213 LOAD_FUNC(snd_pcm_hw_params_get_access
);
214 LOAD_FUNC(snd_pcm_hw_params_get_periods
);
215 LOAD_FUNC(snd_pcm_hw_params_test_format
);
216 LOAD_FUNC(snd_pcm_hw_params_test_channels
);
217 LOAD_FUNC(snd_pcm_hw_params
);
218 LOAD_FUNC(snd_pcm_sw_params_malloc
);
219 LOAD_FUNC(snd_pcm_sw_params_current
);
220 LOAD_FUNC(snd_pcm_sw_params_set_avail_min
);
221 LOAD_FUNC(snd_pcm_sw_params_set_stop_threshold
);
222 LOAD_FUNC(snd_pcm_sw_params
);
223 LOAD_FUNC(snd_pcm_sw_params_free
);
224 LOAD_FUNC(snd_pcm_prepare
);
225 LOAD_FUNC(snd_pcm_start
);
226 LOAD_FUNC(snd_pcm_resume
);
227 LOAD_FUNC(snd_pcm_reset
);
228 LOAD_FUNC(snd_pcm_wait
);
229 LOAD_FUNC(snd_pcm_state
);
230 LOAD_FUNC(snd_pcm_avail_update
);
231 LOAD_FUNC(snd_pcm_areas_silence
);
232 LOAD_FUNC(snd_pcm_mmap_begin
);
233 LOAD_FUNC(snd_pcm_mmap_commit
);
234 LOAD_FUNC(snd_pcm_readi
);
235 LOAD_FUNC(snd_pcm_writei
);
236 LOAD_FUNC(snd_pcm_drain
);
237 LOAD_FUNC(snd_pcm_drop
);
238 LOAD_FUNC(snd_pcm_recover
);
239 LOAD_FUNC(snd_pcm_info_malloc
);
240 LOAD_FUNC(snd_pcm_info_free
);
241 LOAD_FUNC(snd_pcm_info_set_device
);
242 LOAD_FUNC(snd_pcm_info_set_subdevice
);
243 LOAD_FUNC(snd_pcm_info_set_stream
);
244 LOAD_FUNC(snd_pcm_info_get_name
);
245 LOAD_FUNC(snd_ctl_pcm_next_device
);
246 LOAD_FUNC(snd_ctl_pcm_info
);
247 LOAD_FUNC(snd_ctl_open
);
248 LOAD_FUNC(snd_ctl_close
);
249 LOAD_FUNC(snd_ctl_card_info_malloc
);
250 LOAD_FUNC(snd_ctl_card_info_free
);
251 LOAD_FUNC(snd_ctl_card_info
);
252 LOAD_FUNC(snd_ctl_card_info_get_name
);
253 LOAD_FUNC(snd_ctl_card_info_get_id
);
254 LOAD_FUNC(snd_card_next
);
257 alsa_handle
= (void*)0xDEADBEEF;
265 snd_pcm_t
*pcmHandle
;
273 snd_pcm_sframes_t last_avail
;
275 volatile int killNow
;
284 static DevMap
*allDevNameMap
;
285 static ALuint numDevNames
;
286 static DevMap
*allCaptureDevNameMap
;
287 static ALuint numCaptureDevNames
;
290 static const char *prefix_name(snd_pcm_stream_t stream
)
292 assert(stream
== SND_PCM_STREAM_PLAYBACK
|| stream
== SND_PCM_STREAM_CAPTURE
);
293 return (stream
==SND_PCM_STREAM_PLAYBACK
) ? "device-prefix" : "capture-prefix";
296 static DevMap
*probe_devices(snd_pcm_stream_t stream
, ALuint
*count
)
298 const char *main_prefix
= "plughw:";
300 int card
, err
, dev
, idx
;
301 snd_ctl_card_info_t
*info
;
302 snd_pcm_info_t
*pcminfo
;
305 snd_ctl_card_info_malloc(&info
);
306 snd_pcm_info_malloc(&pcminfo
);
308 DevList
= malloc(sizeof(DevMap
) * 1);
309 DevList
[0].name
= strdup(alsaDevice
);
310 DevList
[0].device
= strdup(GetConfigValue("alsa", (stream
==SND_PCM_STREAM_PLAYBACK
) ?
311 "device" : "capture", "default"));
315 if((err
=snd_card_next(&card
)) < 0)
316 ERR("Failed to find a card: %s\n", snd_strerror(err
));
317 ConfigValueStr("alsa", prefix_name(stream
), &main_prefix
);
320 const char *card_prefix
= main_prefix
;
321 const char *cardname
, *cardid
;
324 snprintf(name
, sizeof(name
), "hw:%d", card
);
325 if((err
= snd_ctl_open(&handle
, name
, 0)) < 0)
327 ERR("control open (hw:%d): %s\n", card
, snd_strerror(err
));
330 if((err
= snd_ctl_card_info(handle
, info
)) < 0)
332 ERR("control hardware info (hw:%d): %s\n", card
, snd_strerror(err
));
333 snd_ctl_close(handle
);
337 cardname
= snd_ctl_card_info_get_name(info
);
338 cardid
= snd_ctl_card_info_get_id(info
);
340 snprintf(name
, sizeof(name
), "%s-%s", prefix_name(stream
), cardid
);
341 ConfigValueStr("alsa", name
, &card_prefix
);
349 if(snd_ctl_pcm_next_device(handle
, &dev
) < 0)
350 ERR("snd_ctl_pcm_next_device failed\n");
354 snd_pcm_info_set_device(pcminfo
, dev
);
355 snd_pcm_info_set_subdevice(pcminfo
, 0);
356 snd_pcm_info_set_stream(pcminfo
, stream
);
357 if((err
= snd_ctl_pcm_info(handle
, pcminfo
)) < 0) {
359 ERR("control digital audio info (hw:%d): %s\n", card
, snd_strerror(err
));
363 temp
= realloc(DevList
, sizeof(DevMap
) * (idx
+1));
366 const char *device_prefix
= card_prefix
;
370 devname
= snd_pcm_info_get_name(pcminfo
);
372 snprintf(name
, sizeof(name
), "%s-%s-%d", prefix_name(stream
), cardid
, dev
);
373 ConfigValueStr("alsa", name
, &device_prefix
);
375 snprintf(name
, sizeof(name
), "%s, %s (CARD=%s,DEV=%d)",
376 cardname
, devname
, cardid
, dev
);
377 snprintf(device
, sizeof(device
), "%sCARD=%s,DEV=%d",
378 device_prefix
, cardid
, dev
);
380 TRACE("Got device \"%s\", \"%s\"\n", name
, device
);
381 DevList
[idx
].name
= strdup(name
);
382 DevList
[idx
].device
= strdup(device
);
386 snd_ctl_close(handle
);
388 if(snd_card_next(&card
) < 0) {
389 ERR("snd_card_next failed\n");
394 snd_pcm_info_free(pcminfo
);
395 snd_ctl_card_info_free(info
);
402 static int verify_state(snd_pcm_t
*handle
)
404 snd_pcm_state_t state
= snd_pcm_state(handle
);
409 case SND_PCM_STATE_OPEN
:
410 case SND_PCM_STATE_SETUP
:
411 case SND_PCM_STATE_PREPARED
:
412 case SND_PCM_STATE_RUNNING
:
413 case SND_PCM_STATE_DRAINING
:
414 case SND_PCM_STATE_PAUSED
:
418 case SND_PCM_STATE_XRUN
:
419 if((err
=snd_pcm_recover(handle
, -EPIPE
, 1)) < 0)
422 case SND_PCM_STATE_SUSPENDED
:
423 if((err
=snd_pcm_recover(handle
, -ESTRPIPE
, 1)) < 0)
426 case SND_PCM_STATE_DISCONNECTED
:
434 static ALuint
ALSAProc(ALvoid
*ptr
)
436 ALCdevice
*pDevice
= (ALCdevice
*)ptr
;
437 alsa_data
*data
= (alsa_data
*)pDevice
->ExtraData
;
438 const snd_pcm_channel_area_t
*areas
= NULL
;
439 snd_pcm_uframes_t update_size
, num_updates
;
440 snd_pcm_sframes_t avail
, commitres
;
441 snd_pcm_uframes_t offset
, frames
;
447 update_size
= pDevice
->UpdateSize
;
448 num_updates
= pDevice
->NumUpdates
;
449 while(!data
->killNow
)
451 int state
= verify_state(data
->pcmHandle
);
454 ERR("Invalid state detected: %s\n", snd_strerror(state
));
455 aluHandleDisconnect(pDevice
);
459 avail
= snd_pcm_avail_update(data
->pcmHandle
);
462 ERR("available update failed: %s\n", snd_strerror(avail
));
466 if((snd_pcm_uframes_t
)avail
> update_size
*(num_updates
+1))
468 WARN("available samples exceeds the buffer size\n");
469 snd_pcm_reset(data
->pcmHandle
);
473 // make sure there's frames to process
474 if((snd_pcm_uframes_t
)avail
< update_size
)
476 if(state
!= SND_PCM_STATE_RUNNING
)
478 err
= snd_pcm_start(data
->pcmHandle
);
481 ERR("start failed: %s\n", snd_strerror(err
));
485 if(snd_pcm_wait(data
->pcmHandle
, 1000) == 0)
486 ERR("Wait timeout... buffer size too low?\n");
489 avail
-= avail
%update_size
;
491 // it is possible that contiguous areas are smaller, thus we use a loop
496 err
= snd_pcm_mmap_begin(data
->pcmHandle
, &areas
, &offset
, &frames
);
499 ERR("mmap begin error: %s\n", snd_strerror(err
));
503 WritePtr
= (char*)areas
->addr
+ (offset
* areas
->step
/ 8);
504 aluMixData(pDevice
, WritePtr
, frames
);
506 commitres
= snd_pcm_mmap_commit(data
->pcmHandle
, offset
, frames
);
507 if(commitres
< 0 || (commitres
-frames
) != 0)
509 ERR("mmap commit error: %s\n",
510 snd_strerror(commitres
>= 0 ? -EPIPE
: commitres
));
521 static ALuint
ALSANoMMapProc(ALvoid
*ptr
)
523 ALCdevice
*pDevice
= (ALCdevice
*)ptr
;
524 alsa_data
*data
= (alsa_data
*)pDevice
->ExtraData
;
525 snd_pcm_sframes_t avail
;
530 while(!data
->killNow
)
532 int state
= verify_state(data
->pcmHandle
);
535 ERR("Invalid state detected: %s\n", snd_strerror(state
));
536 aluHandleDisconnect(pDevice
);
540 WritePtr
= data
->buffer
;
541 avail
= data
->size
/ snd_pcm_frames_to_bytes(data
->pcmHandle
, 1);
542 aluMixData(pDevice
, WritePtr
, avail
);
546 int ret
= snd_pcm_writei(data
->pcmHandle
, WritePtr
, avail
);
554 ret
= snd_pcm_recover(data
->pcmHandle
, ret
, 1);
561 WritePtr
+= snd_pcm_frames_to_bytes(data
->pcmHandle
, ret
);
568 ret
= snd_pcm_prepare(data
->pcmHandle
);
578 static ALCenum
alsa_open_playback(ALCdevice
*device
, const ALCchar
*deviceName
)
580 const char *driver
= NULL
;
585 allDevNameMap
= probe_devices(SND_PCM_STREAM_PLAYBACK
, &numDevNames
);
587 if(!deviceName
&& numDevNames
> 0)
589 deviceName
= allDevNameMap
[0].name
;
590 driver
= allDevNameMap
[0].device
;
596 for(idx
= 0;idx
< numDevNames
;idx
++)
598 if(strcmp(deviceName
, allDevNameMap
[idx
].name
) == 0)
600 driver
= allDevNameMap
[idx
].device
;
604 if(idx
== numDevNames
)
605 return ALC_INVALID_VALUE
;
608 data
= (alsa_data
*)calloc(1, sizeof(alsa_data
));
610 err
= snd_pcm_open(&data
->pcmHandle
, driver
, SND_PCM_STREAM_PLAYBACK
, SND_PCM_NONBLOCK
);
613 err
= snd_pcm_nonblock(data
->pcmHandle
, 0);
614 if(err
< 0) snd_pcm_close(data
->pcmHandle
);
619 ERR("Could not open playback device '%s': %s\n", driver
, snd_strerror(err
));
620 return ALC_OUT_OF_MEMORY
;
623 device
->szDeviceName
= strdup(deviceName
);
624 device
->ExtraData
= data
;
628 static void alsa_close_playback(ALCdevice
*device
)
630 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
632 snd_pcm_close(data
->pcmHandle
);
634 device
->ExtraData
= NULL
;
637 static ALCboolean
alsa_reset_playback(ALCdevice
*device
)
639 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
640 snd_pcm_uframes_t periodSizeInFrames
;
641 unsigned int periodLen
, bufferLen
;
642 snd_pcm_sw_params_t
*sp
= NULL
;
643 snd_pcm_hw_params_t
*hp
= NULL
;
644 snd_pcm_access_t access
;
645 snd_pcm_format_t format
;
646 unsigned int periods
;
654 switch(device
->FmtType
)
657 format
= SND_PCM_FORMAT_S8
;
660 format
= SND_PCM_FORMAT_U8
;
663 format
= SND_PCM_FORMAT_S16
;
666 format
= SND_PCM_FORMAT_U16
;
669 format
= SND_PCM_FORMAT_S32
;
672 format
= SND_PCM_FORMAT_U32
;
675 format
= SND_PCM_FORMAT_FLOAT
;
679 allowmmap
= GetConfigValueBool("alsa", "mmap", 1);
680 periods
= device
->NumUpdates
;
681 periodLen
= (ALuint64
)device
->UpdateSize
* 1000000 / device
->Frequency
;
682 bufferLen
= periodLen
* periods
;
683 rate
= device
->Frequency
;
685 snd_pcm_hw_params_malloc(&hp
);
686 #define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error
687 CHECK(snd_pcm_hw_params_any(data
->pcmHandle
, hp
));
688 /* set interleaved access */
689 if(!allowmmap
|| snd_pcm_hw_params_set_access(data
->pcmHandle
, hp
, SND_PCM_ACCESS_MMAP_INTERLEAVED
) < 0)
694 bufferLen
= periodLen
* periods
;
696 CHECK(snd_pcm_hw_params_set_access(data
->pcmHandle
, hp
, SND_PCM_ACCESS_RW_INTERLEAVED
));
698 /* test and set format (implicitly sets sample bits) */
699 if(snd_pcm_hw_params_test_format(data
->pcmHandle
, hp
, format
) < 0)
701 static const struct {
702 snd_pcm_format_t format
;
703 enum DevFmtType fmttype
;
705 { SND_PCM_FORMAT_FLOAT
, DevFmtFloat
},
706 { SND_PCM_FORMAT_S32
, DevFmtInt
},
707 { SND_PCM_FORMAT_U32
, DevFmtUInt
},
708 { SND_PCM_FORMAT_S16
, DevFmtShort
},
709 { SND_PCM_FORMAT_U16
, DevFmtUShort
},
710 { SND_PCM_FORMAT_S8
, DevFmtByte
},
711 { SND_PCM_FORMAT_U8
, DevFmtUByte
},
715 for(k
= 0;k
< COUNTOF(formatlist
);k
++)
717 format
= formatlist
[k
].format
;
718 if(snd_pcm_hw_params_test_format(data
->pcmHandle
, hp
, format
) >= 0)
720 device
->FmtType
= formatlist
[k
].fmttype
;
725 CHECK(snd_pcm_hw_params_set_format(data
->pcmHandle
, hp
, format
));
726 /* test and set channels (implicitly sets frame bits) */
727 if(snd_pcm_hw_params_test_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(device
->FmtChans
)) < 0)
729 static const enum DevFmtChannels channellist
[] = {
738 for(k
= 0;k
< COUNTOF(channellist
);k
++)
740 if(snd_pcm_hw_params_test_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(channellist
[k
])) >= 0)
742 device
->FmtChans
= channellist
[k
];
747 CHECK(snd_pcm_hw_params_set_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(device
->FmtChans
)));
748 /* set rate (implicitly constrains period/buffer parameters) */
749 if(snd_pcm_hw_params_set_rate_resample(data
->pcmHandle
, hp
, 0) < 0)
750 ERR("Failed to disable ALSA resampler\n");
751 CHECK(snd_pcm_hw_params_set_rate_near(data
->pcmHandle
, hp
, &rate
, NULL
));
752 /* set buffer time (implicitly constrains period/buffer parameters) */
753 CHECK(snd_pcm_hw_params_set_buffer_time_near(data
->pcmHandle
, hp
, &bufferLen
, NULL
));
754 /* set period time (implicitly sets buffer size/bytes/time and period size/bytes) */
755 CHECK(snd_pcm_hw_params_set_period_time_near(data
->pcmHandle
, hp
, &periodLen
, NULL
));
756 /* install and prepare hardware configuration */
757 CHECK(snd_pcm_hw_params(data
->pcmHandle
, hp
));
758 /* retrieve configuration info */
759 CHECK(snd_pcm_hw_params_get_access(hp
, &access
));
760 CHECK(snd_pcm_hw_params_get_period_size(hp
, &periodSizeInFrames
, NULL
));
761 CHECK(snd_pcm_hw_params_get_periods(hp
, &periods
, NULL
));
763 snd_pcm_hw_params_free(hp
);
765 snd_pcm_sw_params_malloc(&sp
);
767 CHECK(snd_pcm_sw_params_current(data
->pcmHandle
, sp
));
768 CHECK(snd_pcm_sw_params_set_avail_min(data
->pcmHandle
, sp
, periodSizeInFrames
));
769 CHECK(snd_pcm_sw_params_set_stop_threshold(data
->pcmHandle
, sp
, periodSizeInFrames
*periods
));
770 CHECK(snd_pcm_sw_params(data
->pcmHandle
, sp
));
772 snd_pcm_sw_params_free(sp
);
775 device
->Frequency
= rate
;
776 SetDefaultChannelOrder(device
);
778 data
->size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, periodSizeInFrames
);
779 if(access
== SND_PCM_ACCESS_RW_INTERLEAVED
)
781 /* Increase periods by one, since the temp buffer counts as an extra
784 data
->buffer
= malloc(data
->size
);
787 ERR("buffer malloc failed\n");
790 device
->UpdateSize
= periodSizeInFrames
;
791 device
->NumUpdates
= periods
;
792 data
->thread
= StartThread(ALSANoMMapProc
, device
);
796 err
= snd_pcm_prepare(data
->pcmHandle
);
799 ERR("snd_pcm_prepare(data->pcmHandle) failed: %s\n", snd_strerror(err
));
802 device
->UpdateSize
= periodSizeInFrames
;
803 device
->NumUpdates
= periods
;
804 data
->thread
= StartThread(ALSAProc
, device
);
806 if(data
->thread
== NULL
)
808 ERR("Could not create playback thread\n");
817 ERR("%s failed: %s\n", funcerr
, snd_strerror(err
));
818 if(hp
) snd_pcm_hw_params_free(hp
);
819 if(sp
) snd_pcm_sw_params_free(sp
);
823 static void alsa_stop_playback(ALCdevice
*device
)
825 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
830 StopThread(data
->thread
);
839 static ALCenum
alsa_open_capture(ALCdevice
*pDevice
, const ALCchar
*deviceName
)
841 const char *driver
= NULL
;
842 snd_pcm_hw_params_t
*hp
;
843 snd_pcm_uframes_t bufferSizeInFrames
;
844 snd_pcm_uframes_t periodSizeInFrames
;
845 ALboolean needring
= AL_FALSE
;
846 snd_pcm_format_t format
;
851 if(!allCaptureDevNameMap
)
852 allCaptureDevNameMap
= probe_devices(SND_PCM_STREAM_CAPTURE
, &numCaptureDevNames
);
854 if(!deviceName
&& numCaptureDevNames
> 0)
856 deviceName
= allCaptureDevNameMap
[0].name
;
857 driver
= allCaptureDevNameMap
[0].device
;
863 for(idx
= 0;idx
< numCaptureDevNames
;idx
++)
865 if(strcmp(deviceName
, allCaptureDevNameMap
[idx
].name
) == 0)
867 driver
= allCaptureDevNameMap
[idx
].device
;
871 if(idx
== numCaptureDevNames
)
872 return ALC_INVALID_VALUE
;
875 data
= (alsa_data
*)calloc(1, sizeof(alsa_data
));
877 err
= snd_pcm_open(&data
->pcmHandle
, driver
, SND_PCM_STREAM_CAPTURE
, SND_PCM_NONBLOCK
);
880 ERR("Could not open capture device '%s': %s\n", driver
, snd_strerror(err
));
882 return ALC_INVALID_VALUE
;
886 switch(pDevice
->FmtType
)
889 format
= SND_PCM_FORMAT_S8
;
892 format
= SND_PCM_FORMAT_U8
;
895 format
= SND_PCM_FORMAT_S16
;
898 format
= SND_PCM_FORMAT_U16
;
901 format
= SND_PCM_FORMAT_S32
;
904 format
= SND_PCM_FORMAT_U32
;
907 format
= SND_PCM_FORMAT_FLOAT
;
912 bufferSizeInFrames
= maxu(pDevice
->UpdateSize
*pDevice
->NumUpdates
,
913 100*pDevice
->Frequency
/1000);
914 periodSizeInFrames
= minu(bufferSizeInFrames
, 25*pDevice
->Frequency
/1000);
916 snd_pcm_hw_params_malloc(&hp
);
917 #define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error
918 CHECK(snd_pcm_hw_params_any(data
->pcmHandle
, hp
));
919 /* set interleaved access */
920 CHECK(snd_pcm_hw_params_set_access(data
->pcmHandle
, hp
, SND_PCM_ACCESS_RW_INTERLEAVED
));
921 /* set format (implicitly sets sample bits) */
922 CHECK(snd_pcm_hw_params_set_format(data
->pcmHandle
, hp
, format
));
923 /* set channels (implicitly sets frame bits) */
924 CHECK(snd_pcm_hw_params_set_channels(data
->pcmHandle
, hp
, ChannelsFromDevFmt(pDevice
->FmtChans
)));
925 /* set rate (implicitly constrains period/buffer parameters) */
926 CHECK(snd_pcm_hw_params_set_rate(data
->pcmHandle
, hp
, pDevice
->Frequency
, 0));
927 /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
928 if(snd_pcm_hw_params_set_buffer_size_min(data
->pcmHandle
, hp
, &bufferSizeInFrames
) < 0)
930 TRACE("Buffer too large, using intermediate ring buffer\n");
932 CHECK(snd_pcm_hw_params_set_buffer_size_near(data
->pcmHandle
, hp
, &bufferSizeInFrames
));
934 /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
935 CHECK(snd_pcm_hw_params_set_period_size_near(data
->pcmHandle
, hp
, &periodSizeInFrames
, NULL
));
936 /* install and prepare hardware configuration */
937 CHECK(snd_pcm_hw_params(data
->pcmHandle
, hp
));
938 /* retrieve configuration info */
939 CHECK(snd_pcm_hw_params_get_period_size(hp
, &periodSizeInFrames
, NULL
));
941 snd_pcm_hw_params_free(hp
);
946 data
->ring
= CreateRingBuffer(FrameSizeFromDevFmt(pDevice
->FmtChans
, pDevice
->FmtType
),
947 pDevice
->UpdateSize
*pDevice
->NumUpdates
);
950 ERR("ring buffer create failed\n");
954 data
->size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, periodSizeInFrames
);
955 data
->buffer
= malloc(data
->size
);
958 ERR("buffer malloc failed\n");
963 pDevice
->szDeviceName
= strdup(deviceName
);
965 pDevice
->ExtraData
= data
;
969 ERR("%s failed: %s\n", funcerr
, snd_strerror(err
));
970 if(hp
) snd_pcm_hw_params_free(hp
);
974 DestroyRingBuffer(data
->ring
);
975 snd_pcm_close(data
->pcmHandle
);
978 pDevice
->ExtraData
= NULL
;
979 return ALC_INVALID_VALUE
;
982 static void alsa_close_capture(ALCdevice
*pDevice
)
984 alsa_data
*data
= (alsa_data
*)pDevice
->ExtraData
;
986 snd_pcm_close(data
->pcmHandle
);
987 DestroyRingBuffer(data
->ring
);
991 pDevice
->ExtraData
= NULL
;
994 static void alsa_start_capture(ALCdevice
*Device
)
996 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
999 err
= snd_pcm_start(data
->pcmHandle
);
1002 ERR("start failed: %s\n", snd_strerror(err
));
1003 aluHandleDisconnect(Device
);
1006 data
->doCapture
= AL_TRUE
;
1009 static ALCenum
alsa_capture_samples(ALCdevice
*Device
, ALCvoid
*Buffer
, ALCuint Samples
)
1011 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1015 ReadRingBuffer(data
->ring
, Buffer
, Samples
);
1016 return ALC_NO_ERROR
;
1019 data
->last_avail
-= Samples
;
1020 while(Device
->Connected
&& Samples
> 0)
1022 snd_pcm_sframes_t amt
= 0;
1026 /* First get any data stored from the last stop */
1027 amt
= snd_pcm_bytes_to_frames(data
->pcmHandle
, data
->size
);
1028 if((snd_pcm_uframes_t
)amt
> Samples
) amt
= Samples
;
1030 amt
= snd_pcm_frames_to_bytes(data
->pcmHandle
, amt
);
1031 memmove(Buffer
, data
->buffer
, amt
);
1033 if(data
->size
> amt
)
1035 memmove(data
->buffer
, data
->buffer
+amt
, data
->size
- amt
);
1041 data
->buffer
= NULL
;
1044 amt
= snd_pcm_bytes_to_frames(data
->pcmHandle
, amt
);
1046 else if(data
->doCapture
)
1047 amt
= snd_pcm_readi(data
->pcmHandle
, Buffer
, Samples
);
1050 ERR("read error: %s\n", snd_strerror(amt
));
1054 if((amt
=snd_pcm_recover(data
->pcmHandle
, amt
, 1)) >= 0)
1057 amt
= snd_pcm_start(data
->pcmHandle
);
1059 amt
= snd_pcm_avail_update(data
->pcmHandle
);
1063 ERR("restore error: %s\n", snd_strerror(amt
));
1064 aluHandleDisconnect(Device
);
1067 /* If the amount available is less than what's asked, we lost it
1068 * during recovery. So just give silence instead. */
1069 if((snd_pcm_uframes_t
)amt
< Samples
)
1074 Buffer
= (ALbyte
*)Buffer
+ amt
;
1078 memset(Buffer
, ((Device
->FmtType
== DevFmtUByte
) ? 0x80 : 0),
1079 snd_pcm_frames_to_bytes(data
->pcmHandle
, Samples
));
1081 return ALC_NO_ERROR
;
1084 static ALCuint
alsa_available_samples(ALCdevice
*Device
)
1086 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1087 snd_pcm_sframes_t avail
= 0;
1089 if(Device
->Connected
&& data
->doCapture
)
1090 avail
= snd_pcm_avail_update(data
->pcmHandle
);
1093 ERR("avail update failed: %s\n", snd_strerror(avail
));
1095 if((avail
=snd_pcm_recover(data
->pcmHandle
, avail
, 1)) >= 0)
1098 avail
= snd_pcm_start(data
->pcmHandle
);
1100 avail
= snd_pcm_avail_update(data
->pcmHandle
);
1104 ERR("restore error: %s\n", snd_strerror(avail
));
1105 aluHandleDisconnect(Device
);
1111 if(avail
< 0) avail
= 0;
1112 avail
+= snd_pcm_bytes_to_frames(data
->pcmHandle
, data
->size
);
1113 if(avail
> data
->last_avail
) data
->last_avail
= avail
;
1114 return data
->last_avail
;
1119 snd_pcm_sframes_t amt
;
1121 amt
= snd_pcm_bytes_to_frames(data
->pcmHandle
, data
->size
);
1122 if(avail
< amt
) amt
= avail
;
1124 amt
= snd_pcm_readi(data
->pcmHandle
, data
->buffer
, amt
);
1127 ERR("read error: %s\n", snd_strerror(amt
));
1131 if((amt
=snd_pcm_recover(data
->pcmHandle
, amt
, 1)) >= 0)
1134 amt
= snd_pcm_start(data
->pcmHandle
);
1136 amt
= snd_pcm_avail_update(data
->pcmHandle
);
1140 ERR("restore error: %s\n", snd_strerror(amt
));
1141 aluHandleDisconnect(Device
);
1148 WriteRingBuffer(data
->ring
, data
->buffer
, amt
);
1152 return RingBufferSize(data
->ring
);
1155 static void alsa_stop_capture(ALCdevice
*Device
)
1157 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1161 /* OpenAL requires access to unread audio after stopping, but ALSA's
1162 * snd_pcm_drain is unreliable and snd_pcm_drop drops it. Capture what's
1163 * available now so it'll be available later after the drop. */
1164 avail
= alsa_available_samples(Device
);
1165 if(!data
->ring
&& avail
> 0)
1167 /* The ring buffer implicitly captures when checking availability.
1168 * Direct access needs to explicitly capture it into temp storage. */
1172 size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, avail
);
1173 ptr
= realloc(data
->buffer
, size
);
1177 alsa_capture_samples(Device
, data
->buffer
, avail
);
1181 err
= snd_pcm_drop(data
->pcmHandle
);
1183 ERR("drop failed: %s\n", snd_strerror(err
));
1184 data
->doCapture
= AL_FALSE
;
1188 static const BackendFuncs alsa_funcs
= {
1190 alsa_close_playback
,
1191 alsa_reset_playback
,
1197 alsa_capture_samples
,
1198 alsa_available_samples
1201 ALCboolean
alc_alsa_init(BackendFuncs
*func_list
)
1205 *func_list
= alsa_funcs
;
1209 void alc_alsa_deinit(void)
1213 for(i
= 0;i
< numDevNames
;++i
)
1214 free(allDevNameMap
[i
].device
);
1215 free(allDevNameMap
);
1216 allDevNameMap
= NULL
;
1219 for(i
= 0;i
< numCaptureDevNames
;++i
)
1220 free(allCaptureDevNameMap
[i
].device
);
1221 free(allCaptureDevNameMap
);
1222 allCaptureDevNameMap
= NULL
;
1223 numCaptureDevNames
= 0;
1227 CloseLib(alsa_handle
);
1232 void alc_alsa_probe(enum DevProbe type
)
1238 case ALL_DEVICE_PROBE
:
1239 for(i
= 0;i
< numDevNames
;++i
)
1240 free(allDevNameMap
[i
].device
);
1242 free(allDevNameMap
);
1243 allDevNameMap
= probe_devices(SND_PCM_STREAM_PLAYBACK
, &numDevNames
);
1245 for(i
= 0;i
< numDevNames
;++i
)
1246 AppendAllDeviceList(allDevNameMap
[i
].name
);
1249 case CAPTURE_DEVICE_PROBE
:
1250 for(i
= 0;i
< numCaptureDevNames
;++i
)
1251 free(allCaptureDevNameMap
[i
].device
);
1253 free(allCaptureDevNameMap
);
1254 allCaptureDevNameMap
= probe_devices(SND_PCM_STREAM_CAPTURE
, &numCaptureDevNames
);
1256 for(i
= 0;i
< numCaptureDevNames
;++i
)
1257 AppendCaptureDeviceList(allCaptureDevNameMap
[i
].name
);