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
);
64 MAKE_FUNC(snd_pcm_sw_params_malloc
);
65 MAKE_FUNC(snd_pcm_sw_params_current
);
66 MAKE_FUNC(snd_pcm_sw_params_set_avail_min
);
67 MAKE_FUNC(snd_pcm_sw_params_set_stop_threshold
);
68 MAKE_FUNC(snd_pcm_sw_params
);
69 MAKE_FUNC(snd_pcm_sw_params_free
);
70 MAKE_FUNC(snd_pcm_prepare
);
71 MAKE_FUNC(snd_pcm_start
);
72 MAKE_FUNC(snd_pcm_resume
);
73 MAKE_FUNC(snd_pcm_reset
);
74 MAKE_FUNC(snd_pcm_wait
);
75 MAKE_FUNC(snd_pcm_state
);
76 MAKE_FUNC(snd_pcm_avail_update
);
77 MAKE_FUNC(snd_pcm_areas_silence
);
78 MAKE_FUNC(snd_pcm_mmap_begin
);
79 MAKE_FUNC(snd_pcm_mmap_commit
);
80 MAKE_FUNC(snd_pcm_readi
);
81 MAKE_FUNC(snd_pcm_writei
);
82 MAKE_FUNC(snd_pcm_drain
);
83 MAKE_FUNC(snd_pcm_recover
);
84 MAKE_FUNC(snd_pcm_info_malloc
);
85 MAKE_FUNC(snd_pcm_info_free
);
86 MAKE_FUNC(snd_pcm_info_set_device
);
87 MAKE_FUNC(snd_pcm_info_set_subdevice
);
88 MAKE_FUNC(snd_pcm_info_set_stream
);
89 MAKE_FUNC(snd_pcm_info_get_name
);
90 MAKE_FUNC(snd_ctl_pcm_next_device
);
91 MAKE_FUNC(snd_ctl_pcm_info
);
92 MAKE_FUNC(snd_ctl_open
);
93 MAKE_FUNC(snd_ctl_close
);
94 MAKE_FUNC(snd_ctl_card_info_malloc
);
95 MAKE_FUNC(snd_ctl_card_info_free
);
96 MAKE_FUNC(snd_ctl_card_info
);
97 MAKE_FUNC(snd_ctl_card_info_get_name
);
98 MAKE_FUNC(snd_ctl_card_info_get_id
);
99 MAKE_FUNC(snd_card_next
);
102 #define snd_strerror psnd_strerror
103 #define snd_pcm_open psnd_pcm_open
104 #define snd_pcm_close psnd_pcm_close
105 #define snd_pcm_nonblock psnd_pcm_nonblock
106 #define snd_pcm_frames_to_bytes psnd_pcm_frames_to_bytes
107 #define snd_pcm_bytes_to_frames psnd_pcm_bytes_to_frames
108 #define snd_pcm_hw_params_malloc psnd_pcm_hw_params_malloc
109 #define snd_pcm_hw_params_free psnd_pcm_hw_params_free
110 #define snd_pcm_hw_params_any psnd_pcm_hw_params_any
111 #define snd_pcm_hw_params_set_access psnd_pcm_hw_params_set_access
112 #define snd_pcm_hw_params_set_format psnd_pcm_hw_params_set_format
113 #define snd_pcm_hw_params_set_channels psnd_pcm_hw_params_set_channels
114 #define snd_pcm_hw_params_set_periods_near psnd_pcm_hw_params_set_periods_near
115 #define snd_pcm_hw_params_set_rate_near psnd_pcm_hw_params_set_rate_near
116 #define snd_pcm_hw_params_set_rate psnd_pcm_hw_params_set_rate
117 #define snd_pcm_hw_params_set_rate_resample psnd_pcm_hw_params_set_rate_resample
118 #define snd_pcm_hw_params_set_buffer_time_near psnd_pcm_hw_params_set_buffer_time_near
119 #define snd_pcm_hw_params_set_period_time_near psnd_pcm_hw_params_set_period_time_near
120 #define snd_pcm_hw_params_set_buffer_size_near psnd_pcm_hw_params_set_buffer_size_near
121 #define snd_pcm_hw_params_set_period_size_near psnd_pcm_hw_params_set_period_size_near
122 #define snd_pcm_hw_params_set_buffer_size_min psnd_pcm_hw_params_set_buffer_size_min
123 #define snd_pcm_hw_params_get_buffer_size psnd_pcm_hw_params_get_buffer_size
124 #define snd_pcm_hw_params_get_period_size psnd_pcm_hw_params_get_period_size
125 #define snd_pcm_hw_params_get_access psnd_pcm_hw_params_get_access
126 #define snd_pcm_hw_params_get_periods psnd_pcm_hw_params_get_periods
127 #define snd_pcm_hw_params psnd_pcm_hw_params
128 #define snd_pcm_sw_params_malloc psnd_pcm_sw_params_malloc
129 #define snd_pcm_sw_params_current psnd_pcm_sw_params_current
130 #define snd_pcm_sw_params_set_avail_min psnd_pcm_sw_params_set_avail_min
131 #define snd_pcm_sw_params_set_stop_threshold psnd_pcm_sw_params_set_stop_threshold
132 #define snd_pcm_sw_params psnd_pcm_sw_params
133 #define snd_pcm_sw_params_free psnd_pcm_sw_params_free
134 #define snd_pcm_prepare psnd_pcm_prepare
135 #define snd_pcm_start psnd_pcm_start
136 #define snd_pcm_resume psnd_pcm_resume
137 #define snd_pcm_reset psnd_pcm_reset
138 #define snd_pcm_wait psnd_pcm_wait
139 #define snd_pcm_state psnd_pcm_state
140 #define snd_pcm_avail_update psnd_pcm_avail_update
141 #define snd_pcm_areas_silence psnd_pcm_areas_silence
142 #define snd_pcm_mmap_begin psnd_pcm_mmap_begin
143 #define snd_pcm_mmap_commit psnd_pcm_mmap_commit
144 #define snd_pcm_readi psnd_pcm_readi
145 #define snd_pcm_writei psnd_pcm_writei
146 #define snd_pcm_drain psnd_pcm_drain
147 #define snd_pcm_recover psnd_pcm_recover
148 #define snd_pcm_info_malloc psnd_pcm_info_malloc
149 #define snd_pcm_info_free psnd_pcm_info_free
150 #define snd_pcm_info_set_device psnd_pcm_info_set_device
151 #define snd_pcm_info_set_subdevice psnd_pcm_info_set_subdevice
152 #define snd_pcm_info_set_stream psnd_pcm_info_set_stream
153 #define snd_pcm_info_get_name psnd_pcm_info_get_name
154 #define snd_ctl_pcm_next_device psnd_ctl_pcm_next_device
155 #define snd_ctl_pcm_info psnd_ctl_pcm_info
156 #define snd_ctl_open psnd_ctl_open
157 #define snd_ctl_close psnd_ctl_close
158 #define snd_ctl_card_info_malloc psnd_ctl_card_info_malloc
159 #define snd_ctl_card_info_free psnd_ctl_card_info_free
160 #define snd_ctl_card_info psnd_ctl_card_info
161 #define snd_ctl_card_info_get_name psnd_ctl_card_info_get_name
162 #define snd_ctl_card_info_get_id psnd_ctl_card_info_get_id
163 #define snd_card_next psnd_card_next
167 static ALCboolean
alsa_load(void)
172 alsa_handle
= LoadLib("libasound.so.2");
176 #define LOAD_FUNC(f) do { \
177 p##f = GetSymbol(alsa_handle, #f); \
179 CloseLib(alsa_handle); \
180 alsa_handle = NULL; \
184 LOAD_FUNC(snd_strerror
);
185 LOAD_FUNC(snd_pcm_open
);
186 LOAD_FUNC(snd_pcm_close
);
187 LOAD_FUNC(snd_pcm_nonblock
);
188 LOAD_FUNC(snd_pcm_frames_to_bytes
);
189 LOAD_FUNC(snd_pcm_bytes_to_frames
);
190 LOAD_FUNC(snd_pcm_hw_params_malloc
);
191 LOAD_FUNC(snd_pcm_hw_params_free
);
192 LOAD_FUNC(snd_pcm_hw_params_any
);
193 LOAD_FUNC(snd_pcm_hw_params_set_access
);
194 LOAD_FUNC(snd_pcm_hw_params_set_format
);
195 LOAD_FUNC(snd_pcm_hw_params_set_channels
);
196 LOAD_FUNC(snd_pcm_hw_params_set_periods_near
);
197 LOAD_FUNC(snd_pcm_hw_params_set_rate_near
);
198 LOAD_FUNC(snd_pcm_hw_params_set_rate
);
199 LOAD_FUNC(snd_pcm_hw_params_set_rate_resample
);
200 LOAD_FUNC(snd_pcm_hw_params_set_buffer_time_near
);
201 LOAD_FUNC(snd_pcm_hw_params_set_period_time_near
);
202 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_near
);
203 LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_min
);
204 LOAD_FUNC(snd_pcm_hw_params_set_period_size_near
);
205 LOAD_FUNC(snd_pcm_hw_params_get_buffer_size
);
206 LOAD_FUNC(snd_pcm_hw_params_get_period_size
);
207 LOAD_FUNC(snd_pcm_hw_params_get_access
);
208 LOAD_FUNC(snd_pcm_hw_params_get_periods
);
209 LOAD_FUNC(snd_pcm_hw_params
);
210 LOAD_FUNC(snd_pcm_sw_params_malloc
);
211 LOAD_FUNC(snd_pcm_sw_params_current
);
212 LOAD_FUNC(snd_pcm_sw_params_set_avail_min
);
213 LOAD_FUNC(snd_pcm_sw_params_set_stop_threshold
);
214 LOAD_FUNC(snd_pcm_sw_params
);
215 LOAD_FUNC(snd_pcm_sw_params_free
);
216 LOAD_FUNC(snd_pcm_prepare
);
217 LOAD_FUNC(snd_pcm_start
);
218 LOAD_FUNC(snd_pcm_resume
);
219 LOAD_FUNC(snd_pcm_reset
);
220 LOAD_FUNC(snd_pcm_wait
);
221 LOAD_FUNC(snd_pcm_state
);
222 LOAD_FUNC(snd_pcm_avail_update
);
223 LOAD_FUNC(snd_pcm_areas_silence
);
224 LOAD_FUNC(snd_pcm_mmap_begin
);
225 LOAD_FUNC(snd_pcm_mmap_commit
);
226 LOAD_FUNC(snd_pcm_readi
);
227 LOAD_FUNC(snd_pcm_writei
);
228 LOAD_FUNC(snd_pcm_drain
);
229 LOAD_FUNC(snd_pcm_recover
);
230 LOAD_FUNC(snd_pcm_info_malloc
);
231 LOAD_FUNC(snd_pcm_info_free
);
232 LOAD_FUNC(snd_pcm_info_set_device
);
233 LOAD_FUNC(snd_pcm_info_set_subdevice
);
234 LOAD_FUNC(snd_pcm_info_set_stream
);
235 LOAD_FUNC(snd_pcm_info_get_name
);
236 LOAD_FUNC(snd_ctl_pcm_next_device
);
237 LOAD_FUNC(snd_ctl_pcm_info
);
238 LOAD_FUNC(snd_ctl_open
);
239 LOAD_FUNC(snd_ctl_close
);
240 LOAD_FUNC(snd_ctl_card_info_malloc
);
241 LOAD_FUNC(snd_ctl_card_info_free
);
242 LOAD_FUNC(snd_ctl_card_info
);
243 LOAD_FUNC(snd_ctl_card_info_get_name
);
244 LOAD_FUNC(snd_ctl_card_info_get_id
);
245 LOAD_FUNC(snd_card_next
);
248 alsa_handle
= (void*)0xDEADBEEF;
256 snd_pcm_t
*pcmHandle
;
264 volatile int killNow
;
274 static DevMap
*allDevNameMap
;
275 static ALuint numDevNames
;
276 static DevMap
*allCaptureDevNameMap
;
277 static ALuint numCaptureDevNames
;
279 static const char *device_prefix
;
280 static const char *capture_prefix
;
283 static DevMap
*probe_devices(snd_pcm_stream_t stream
, ALuint
*count
)
286 int card
, err
, dev
, idx
;
287 snd_ctl_card_info_t
*info
;
288 snd_pcm_info_t
*pcminfo
;
292 snd_ctl_card_info_malloc(&info
);
293 snd_pcm_info_malloc(&pcminfo
);
296 if((err
=snd_card_next(&card
)) < 0)
297 ERR("Failed to find a card: %s\n", snd_strerror(err
));
299 DevList
= malloc(sizeof(DevMap
) * 1);
300 DevList
[0].name
= strdup("ALSA Default");
301 DevList
[0].card
= NULL
;
306 sprintf(name
, "hw:%d", card
);
307 if((err
= snd_ctl_open(&handle
, name
, 0)) < 0)
309 ERR("control open (hw:%d): %s\n", card
, snd_strerror(err
));
312 if((err
= snd_ctl_card_info(handle
, info
)) < 0)
314 ERR("control hardware info (hw:%d): %s\n", card
, snd_strerror(err
));
315 snd_ctl_close(handle
);
322 const char *cname
, *dname
, *cid
;
325 if(snd_ctl_pcm_next_device(handle
, &dev
) < 0)
326 ERR("snd_ctl_pcm_next_device failed\n");
330 snd_pcm_info_set_device(pcminfo
, dev
);
331 snd_pcm_info_set_subdevice(pcminfo
, 0);
332 snd_pcm_info_set_stream(pcminfo
, stream
);
333 if((err
= snd_ctl_pcm_info(handle
, pcminfo
)) < 0) {
335 ERR("control digital audio info (hw:%d): %s\n", card
, snd_strerror(err
));
339 temp
= realloc(DevList
, sizeof(DevMap
) * (idx
+1));
343 cname
= snd_ctl_card_info_get_name(info
);
344 dname
= snd_pcm_info_get_name(pcminfo
);
345 cid
= snd_ctl_card_info_get_id(info
);
346 snprintf(name
, sizeof(name
), "%s, %s (CARD=%s,DEV=%d)",
347 cname
, dname
, cid
, dev
);
348 DevList
[idx
].name
= strdup(name
);
349 DevList
[idx
].card
= strdup(cid
);
350 DevList
[idx
].dev
= dev
;
354 snd_ctl_close(handle
);
356 if(snd_card_next(&card
) < 0) {
357 ERR("snd_card_next failed\n");
362 snd_pcm_info_free(pcminfo
);
363 snd_ctl_card_info_free(info
);
370 static int xrun_recovery(snd_pcm_t
*handle
, int err
)
372 err
= snd_pcm_recover(handle
, err
, 1);
374 ERR("recover failed: %s\n", snd_strerror(err
));
378 static int verify_state(snd_pcm_t
*handle
)
380 snd_pcm_state_t state
= snd_pcm_state(handle
);
381 if(state
== SND_PCM_STATE_DISCONNECTED
)
383 if(state
== SND_PCM_STATE_XRUN
)
385 int err
= xrun_recovery(handle
, -EPIPE
);
386 if(err
< 0) return err
;
388 else if(state
== SND_PCM_STATE_SUSPENDED
)
390 int err
= xrun_recovery(handle
, -ESTRPIPE
);
391 if(err
< 0) return err
;
398 static ALuint
ALSAProc(ALvoid
*ptr
)
400 ALCdevice
*pDevice
= (ALCdevice
*)ptr
;
401 alsa_data
*data
= (alsa_data
*)pDevice
->ExtraData
;
402 const snd_pcm_channel_area_t
*areas
= NULL
;
403 snd_pcm_uframes_t update_size
, num_updates
;
404 snd_pcm_sframes_t avail
, commitres
;
405 snd_pcm_uframes_t offset
, frames
;
411 update_size
= pDevice
->UpdateSize
;
412 num_updates
= pDevice
->NumUpdates
;
413 while(!data
->killNow
)
415 int state
= verify_state(data
->pcmHandle
);
418 ERR("Invalid state detected: %s\n", snd_strerror(state
));
419 aluHandleDisconnect(pDevice
);
423 avail
= snd_pcm_avail_update(data
->pcmHandle
);
426 ERR("available update failed: %s\n", snd_strerror(avail
));
430 if((snd_pcm_uframes_t
)avail
> update_size
*(num_updates
+1))
432 WARN("available samples exceeds the buffer size\n");
433 snd_pcm_reset(data
->pcmHandle
);
437 // make sure there's frames to process
438 if((snd_pcm_uframes_t
)avail
< update_size
)
440 if(state
!= SND_PCM_STATE_RUNNING
)
442 err
= snd_pcm_start(data
->pcmHandle
);
445 ERR("start failed: %s\n", snd_strerror(err
));
449 if(snd_pcm_wait(data
->pcmHandle
, 1000) == 0)
450 ERR("Wait timeout... buffer size too low?\n");
453 avail
-= avail
%update_size
;
455 // it is possible that contiguous areas are smaller, thus we use a loop
460 err
= snd_pcm_mmap_begin(data
->pcmHandle
, &areas
, &offset
, &frames
);
463 ERR("mmap begin error: %s\n", snd_strerror(err
));
467 WritePtr
= (char*)areas
->addr
+ (offset
* areas
->step
/ 8);
468 aluMixData(pDevice
, WritePtr
, frames
);
470 commitres
= snd_pcm_mmap_commit(data
->pcmHandle
, offset
, frames
);
471 if(commitres
< 0 || (commitres
-frames
) != 0)
473 ERR("mmap commit error: %s\n",
474 snd_strerror(commitres
>= 0 ? -EPIPE
: commitres
));
485 static ALuint
ALSANoMMapProc(ALvoid
*ptr
)
487 ALCdevice
*pDevice
= (ALCdevice
*)ptr
;
488 alsa_data
*data
= (alsa_data
*)pDevice
->ExtraData
;
489 snd_pcm_sframes_t avail
;
494 while(!data
->killNow
)
496 int state
= verify_state(data
->pcmHandle
);
499 ERR("Invalid state detected: %s\n", snd_strerror(state
));
500 aluHandleDisconnect(pDevice
);
504 WritePtr
= data
->buffer
;
505 avail
= data
->size
/ snd_pcm_frames_to_bytes(data
->pcmHandle
, 1);
506 aluMixData(pDevice
, WritePtr
, avail
);
510 int ret
= snd_pcm_writei(data
->pcmHandle
, WritePtr
, avail
);
518 ret
= snd_pcm_recover(data
->pcmHandle
, ret
, 1);
525 WritePtr
+= snd_pcm_frames_to_bytes(data
->pcmHandle
, ret
);
532 ret
= snd_pcm_prepare(data
->pcmHandle
);
542 static ALCenum
alsa_open_playback(ALCdevice
*device
, const ALCchar
*deviceName
)
544 const char *driver
= "default";
549 ConfigValueStr("alsa", "device", &driver
);
552 deviceName
= alsaDevice
;
553 else if(strcmp(deviceName
, alsaDevice
) != 0)
558 allDevNameMap
= probe_devices(SND_PCM_STREAM_PLAYBACK
, &numDevNames
);
560 for(idx
= 0;idx
< numDevNames
;idx
++)
562 if(allDevNameMap
[idx
].name
&&
563 strcmp(deviceName
, allDevNameMap
[idx
].name
) == 0)
567 snprintf(str
, sizeof(str
), "%sCARD=%s,DEV=%d", device_prefix
,
568 allDevNameMap
[idx
].card
, allDevNameMap
[idx
].dev
);
574 if(idx
== numDevNames
)
575 return ALC_INVALID_VALUE
;
578 data
= (alsa_data
*)calloc(1, sizeof(alsa_data
));
580 i
= snd_pcm_open(&data
->pcmHandle
, driver
, SND_PCM_STREAM_PLAYBACK
, SND_PCM_NONBLOCK
);
583 i
= snd_pcm_nonblock(data
->pcmHandle
, 0);
585 snd_pcm_close(data
->pcmHandle
);
590 ERR("Could not open playback device '%s': %s\n", driver
, snd_strerror(i
));
591 return ALC_OUT_OF_MEMORY
;
594 device
->szDeviceName
= strdup(deviceName
);
595 device
->ExtraData
= data
;
599 static void alsa_close_playback(ALCdevice
*device
)
601 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
603 snd_pcm_close(data
->pcmHandle
);
605 device
->ExtraData
= NULL
;
608 static ALCboolean
alsa_reset_playback(ALCdevice
*device
)
610 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
611 snd_pcm_uframes_t periodSizeInFrames
;
612 unsigned int periodLen
, bufferLen
;
613 snd_pcm_sw_params_t
*sp
= NULL
;
614 snd_pcm_hw_params_t
*p
= NULL
;
615 snd_pcm_access_t access
;
616 snd_pcm_format_t format
;
617 unsigned int periods
;
625 switch(device
->FmtType
)
628 format
= SND_PCM_FORMAT_S8
;
631 format
= SND_PCM_FORMAT_U8
;
634 format
= SND_PCM_FORMAT_S16
;
637 format
= SND_PCM_FORMAT_U16
;
640 format
= SND_PCM_FORMAT_FLOAT
;
644 allowmmap
= GetConfigValueBool("alsa", "mmap", 1);
645 periods
= device
->NumUpdates
;
646 periodLen
= (ALuint64
)device
->UpdateSize
* 1000000 / device
->Frequency
;
647 bufferLen
= periodLen
* periods
;
648 rate
= device
->Frequency
;
651 snd_pcm_hw_params_malloc(&p
);
653 if((i
=snd_pcm_hw_params_any(data
->pcmHandle
, p
)) < 0)
655 /* set interleaved access */
656 if(i
>= 0 && (!allowmmap
|| (i
=snd_pcm_hw_params_set_access(data
->pcmHandle
, p
, SND_PCM_ACCESS_MMAP_INTERLEAVED
)) < 0))
661 bufferLen
= periodLen
* periods
;
663 if((i
=snd_pcm_hw_params_set_access(data
->pcmHandle
, p
, SND_PCM_ACCESS_RW_INTERLEAVED
)) < 0)
666 /* set format (implicitly sets sample bits) */
667 if(i
>= 0 && (i
=snd_pcm_hw_params_set_format(data
->pcmHandle
, p
, format
)) < 0)
669 device
->FmtType
= DevFmtFloat
;
670 if(format
== SND_PCM_FORMAT_FLOAT
||
671 (i
=snd_pcm_hw_params_set_format(data
->pcmHandle
, p
, SND_PCM_FORMAT_FLOAT
)) < 0)
673 device
->FmtType
= DevFmtShort
;
674 if(format
== SND_PCM_FORMAT_S16
||
675 (i
=snd_pcm_hw_params_set_format(data
->pcmHandle
, p
, SND_PCM_FORMAT_S16
)) < 0)
677 device
->FmtType
= DevFmtUByte
;
678 if(format
== SND_PCM_FORMAT_U8
||
679 (i
=snd_pcm_hw_params_set_format(data
->pcmHandle
, p
, SND_PCM_FORMAT_U8
)) < 0)
684 /* set channels (implicitly sets frame bits) */
685 if(i
>= 0 && (i
=snd_pcm_hw_params_set_channels(data
->pcmHandle
, p
, ChannelsFromDevFmt(device
->FmtChans
))) < 0)
687 if((i
=snd_pcm_hw_params_set_channels(data
->pcmHandle
, p
, 2)) < 0)
689 if((i
=snd_pcm_hw_params_set_channels(data
->pcmHandle
, p
, 1)) < 0)
690 err
= "set channels";
692 device
->FmtChans
= DevFmtMono
;
695 device
->FmtChans
= DevFmtStereo
;
697 if(i
>= 0 && (i
=snd_pcm_hw_params_set_rate_resample(data
->pcmHandle
, p
, 0)) < 0)
699 ERR("Failed to disable ALSA resampler\n");
702 /* set rate (implicitly constrains period/buffer parameters) */
703 if(i
>= 0 && (i
=snd_pcm_hw_params_set_rate_near(data
->pcmHandle
, p
, &rate
, NULL
)) < 0)
704 err
= "set rate near";
705 /* set buffer time (implicitly constrains period/buffer parameters) */
706 if(i
>= 0 && (i
=snd_pcm_hw_params_set_buffer_time_near(data
->pcmHandle
, p
, &bufferLen
, NULL
)) < 0)
707 err
= "set buffer time near";
708 /* set period time in frame units (implicitly sets buffer size/bytes/time and period size/bytes) */
709 if(i
>= 0 && (i
=snd_pcm_hw_params_set_period_time_near(data
->pcmHandle
, p
, &periodLen
, NULL
)) < 0)
710 err
= "set period time near";
711 /* install and prepare hardware configuration */
712 if(i
>= 0 && (i
=snd_pcm_hw_params(data
->pcmHandle
, p
)) < 0)
714 if(i
>= 0 && (i
=snd_pcm_hw_params_get_access(p
, &access
)) < 0)
716 if(i
>= 0 && (i
=snd_pcm_hw_params_get_period_size(p
, &periodSizeInFrames
, NULL
)) < 0)
717 err
= "get period size";
718 if(i
>= 0 && (i
=snd_pcm_hw_params_get_periods(p
, &periods
, NULL
)) < 0)
722 ERR("%s failed: %s\n", err
, snd_strerror(i
));
723 snd_pcm_hw_params_free(p
);
727 snd_pcm_hw_params_free(p
);
730 snd_pcm_sw_params_malloc(&sp
);
732 if((i
=snd_pcm_sw_params_current(data
->pcmHandle
, sp
)) != 0)
734 if(i
== 0 && (i
=snd_pcm_sw_params_set_avail_min(data
->pcmHandle
, sp
, periodSizeInFrames
)) != 0)
735 err
= "sw set avail min";
736 if(i
== 0 && (i
=snd_pcm_sw_params_set_stop_threshold(data
->pcmHandle
, sp
, periodSizeInFrames
*periods
)) != 0)
737 err
= "sw set stop threshold";
738 if(i
== 0 && (i
=snd_pcm_sw_params(data
->pcmHandle
, sp
)) != 0)
739 err
= "sw set params";
742 ERR("%s failed: %s\n", err
, snd_strerror(i
));
743 snd_pcm_sw_params_free(sp
);
747 snd_pcm_sw_params_free(sp
);
749 device
->Frequency
= rate
;
750 SetDefaultChannelOrder(device
);
752 data
->size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, periodSizeInFrames
);
753 if(access
== SND_PCM_ACCESS_RW_INTERLEAVED
)
755 /* Increase periods by one, since the temp buffer counts as an extra
758 data
->buffer
= malloc(data
->size
);
761 ERR("buffer malloc failed\n");
764 device
->UpdateSize
= periodSizeInFrames
;
765 device
->NumUpdates
= periods
;
766 data
->thread
= StartThread(ALSANoMMapProc
, device
);
770 i
= snd_pcm_prepare(data
->pcmHandle
);
773 ERR("prepare error: %s\n", snd_strerror(i
));
776 device
->UpdateSize
= periodSizeInFrames
;
777 device
->NumUpdates
= periods
;
778 data
->thread
= StartThread(ALSAProc
, device
);
780 if(data
->thread
== NULL
)
782 ERR("Could not create playback thread\n");
791 static void alsa_stop_playback(ALCdevice
*device
)
793 alsa_data
*data
= (alsa_data
*)device
->ExtraData
;
798 StopThread(data
->thread
);
807 static ALCenum
alsa_open_capture(ALCdevice
*pDevice
, const ALCchar
*deviceName
)
809 const char *driver
= "default";
810 snd_pcm_hw_params_t
*p
;
811 snd_pcm_uframes_t bufferSizeInFrames
;
812 snd_pcm_uframes_t periodSizeInFrames
;
813 snd_pcm_format_t format
;
820 ConfigValueStr("alsa", "capture", &driver
);
822 if(!allCaptureDevNameMap
)
823 allCaptureDevNameMap
= probe_devices(SND_PCM_STREAM_CAPTURE
, &numCaptureDevNames
);
826 deviceName
= allCaptureDevNameMap
[0].name
;
831 for(idx
= 0;idx
< numCaptureDevNames
;idx
++)
833 if(allCaptureDevNameMap
[idx
].name
&&
834 strcmp(deviceName
, allCaptureDevNameMap
[idx
].name
) == 0)
838 snprintf(str
, sizeof(str
), "%sCARD=%s,DEV=%d", capture_prefix
,
839 allCaptureDevNameMap
[idx
].card
, allCaptureDevNameMap
[idx
].dev
);
845 if(idx
== numCaptureDevNames
)
846 return ALC_INVALID_VALUE
;
849 data
= (alsa_data
*)calloc(1, sizeof(alsa_data
));
851 i
= snd_pcm_open(&data
->pcmHandle
, driver
, SND_PCM_STREAM_CAPTURE
, SND_PCM_NONBLOCK
);
854 ERR("Could not open capture device '%s': %s\n", driver
, snd_strerror(i
));
856 return ALC_INVALID_VALUE
;
860 switch(pDevice
->FmtType
)
863 format
= SND_PCM_FORMAT_S8
;
866 format
= SND_PCM_FORMAT_U8
;
869 format
= SND_PCM_FORMAT_S16
;
872 format
= SND_PCM_FORMAT_U16
;
875 format
= SND_PCM_FORMAT_FLOAT
;
880 bufferSizeInFrames
= maxu(pDevice
->UpdateSize
*pDevice
->NumUpdates
,
881 100*pDevice
->Frequency
/1000);
882 periodSizeInFrames
= minu(bufferSizeInFrames
, 50*pDevice
->Frequency
/1000);
883 snd_pcm_hw_params_malloc(&p
);
885 if((i
=snd_pcm_hw_params_any(data
->pcmHandle
, p
)) < 0)
887 /* set interleaved access */
888 if(i
>= 0 && (i
=snd_pcm_hw_params_set_access(data
->pcmHandle
, p
, SND_PCM_ACCESS_RW_INTERLEAVED
)) < 0)
890 /* set format (implicitly sets sample bits) */
891 if(i
>= 0 && (i
=snd_pcm_hw_params_set_format(data
->pcmHandle
, p
, format
)) < 0)
893 /* set channels (implicitly sets frame bits) */
894 if(i
>= 0 && (i
=snd_pcm_hw_params_set_channels(data
->pcmHandle
, p
, ChannelsFromDevFmt(pDevice
->FmtChans
))) < 0)
895 err
= "set channels";
896 /* set rate (implicitly constrains period/buffer parameters) */
897 if(i
>= 0 && (i
=snd_pcm_hw_params_set_rate(data
->pcmHandle
, p
, pDevice
->Frequency
, 0)) < 0)
898 err
= "set rate near";
899 /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
900 if(i
>= 0 && (i
=snd_pcm_hw_params_set_buffer_size_near(data
->pcmHandle
, p
, &bufferSizeInFrames
)) < 0)
901 err
= "set buffer size near";
902 /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
903 if(i
>= 0 && (i
=snd_pcm_hw_params_set_period_size_near(data
->pcmHandle
, p
, &periodSizeInFrames
, NULL
)) < 0)
904 err
= "set period size near";
905 /* install and prepare hardware configuration */
906 if(i
>= 0 && (i
=snd_pcm_hw_params(data
->pcmHandle
, p
)) < 0)
910 ERR("%s failed: %s\n", err
, snd_strerror(i
));
911 snd_pcm_hw_params_free(p
);
915 if((i
=snd_pcm_hw_params_get_period_size(p
, &bufferSizeInFrames
, NULL
)) < 0)
917 ERR("get size failed: %s\n", snd_strerror(i
));
918 snd_pcm_hw_params_free(p
);
922 snd_pcm_hw_params_free(p
);
924 frameSize
= FrameSizeFromDevFmt(pDevice
->FmtChans
, pDevice
->FmtType
);
926 data
->ring
= CreateRingBuffer(frameSize
, pDevice
->UpdateSize
*pDevice
->NumUpdates
);
929 ERR("ring buffer create failed\n");
933 data
->size
= snd_pcm_frames_to_bytes(data
->pcmHandle
, bufferSizeInFrames
);
934 data
->buffer
= malloc(data
->size
);
937 ERR("buffer malloc failed\n");
941 pDevice
->szDeviceName
= strdup(deviceName
);
943 pDevice
->ExtraData
= data
;
948 DestroyRingBuffer(data
->ring
);
949 snd_pcm_close(data
->pcmHandle
);
952 pDevice
->ExtraData
= NULL
;
953 return ALC_INVALID_VALUE
;
956 static void alsa_close_capture(ALCdevice
*pDevice
)
958 alsa_data
*data
= (alsa_data
*)pDevice
->ExtraData
;
960 snd_pcm_close(data
->pcmHandle
);
961 DestroyRingBuffer(data
->ring
);
965 pDevice
->ExtraData
= NULL
;
968 static void alsa_start_capture(ALCdevice
*Device
)
970 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
973 err
= snd_pcm_start(data
->pcmHandle
);
976 ERR("start failed: %s\n", snd_strerror(err
));
977 aluHandleDisconnect(Device
);
980 data
->doCapture
= AL_TRUE
;
983 static void alsa_stop_capture(ALCdevice
*Device
)
985 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
986 snd_pcm_drain(data
->pcmHandle
);
987 data
->doCapture
= AL_FALSE
;
990 static ALCenum
alsa_capture_samples(ALCdevice
*Device
, ALCvoid
*Buffer
, ALCuint Samples
)
992 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
993 ReadRingBuffer(data
->ring
, Buffer
, Samples
);
997 static ALCuint
alsa_available_samples(ALCdevice
*Device
)
999 alsa_data
*data
= (alsa_data
*)Device
->ExtraData
;
1000 snd_pcm_sframes_t avail
;
1002 avail
= (Device
->Connected
? snd_pcm_avail_update(data
->pcmHandle
) : 0);
1005 ERR("avail update failed: %s\n", snd_strerror(avail
));
1007 if((avail
=snd_pcm_recover(data
->pcmHandle
, avail
, 1)) >= 0)
1010 avail
= snd_pcm_start(data
->pcmHandle
);
1012 avail
= snd_pcm_avail_update(data
->pcmHandle
);
1016 ERR("restore error: %s\n", snd_strerror(avail
));
1017 aluHandleDisconnect(Device
);
1022 snd_pcm_sframes_t amt
;
1024 amt
= snd_pcm_bytes_to_frames(data
->pcmHandle
, data
->size
);
1025 if(avail
< amt
) amt
= avail
;
1027 amt
= snd_pcm_readi(data
->pcmHandle
, data
->buffer
, amt
);
1030 ERR("read error: %s\n", snd_strerror(amt
));
1034 if((amt
=snd_pcm_recover(data
->pcmHandle
, amt
, 1)) >= 0)
1037 amt
= snd_pcm_start(data
->pcmHandle
);
1039 amt
= snd_pcm_avail_update(data
->pcmHandle
);
1043 ERR("restore error: %s\n", snd_strerror(amt
));
1044 aluHandleDisconnect(Device
);
1051 WriteRingBuffer(data
->ring
, data
->buffer
, amt
);
1055 return RingBufferSize(data
->ring
);
1059 static const BackendFuncs alsa_funcs
= {
1061 alsa_close_playback
,
1062 alsa_reset_playback
,
1068 alsa_capture_samples
,
1069 alsa_available_samples
1072 ALCboolean
alc_alsa_init(BackendFuncs
*func_list
)
1076 device_prefix
= GetConfigValue("alsa", "device-prefix", "plughw:");
1077 capture_prefix
= GetConfigValue("alsa", "capture-prefix", "plughw:");
1078 *func_list
= alsa_funcs
;
1082 void alc_alsa_deinit(void)
1086 for(i
= 0;i
< numDevNames
;++i
)
1088 free(allDevNameMap
[i
].name
);
1089 free(allDevNameMap
[i
].card
);
1091 free(allDevNameMap
);
1092 allDevNameMap
= NULL
;
1095 for(i
= 0;i
< numCaptureDevNames
;++i
)
1097 free(allCaptureDevNameMap
[i
].name
);
1098 free(allCaptureDevNameMap
[i
].card
);
1100 free(allCaptureDevNameMap
);
1101 allCaptureDevNameMap
= NULL
;
1102 numCaptureDevNames
= 0;
1106 CloseLib(alsa_handle
);
1111 void alc_alsa_probe(enum DevProbe type
)
1118 AppendDeviceList(alsaDevice
);
1121 case ALL_DEVICE_PROBE
:
1122 for(i
= 0;i
< numDevNames
;++i
)
1124 free(allDevNameMap
[i
].name
);
1125 free(allDevNameMap
[i
].card
);
1128 free(allDevNameMap
);
1129 allDevNameMap
= probe_devices(SND_PCM_STREAM_PLAYBACK
, &numDevNames
);
1131 for(i
= 0;i
< numDevNames
;++i
)
1132 AppendAllDeviceList(allDevNameMap
[i
].name
);
1135 case CAPTURE_DEVICE_PROBE
:
1136 for(i
= 0;i
< numCaptureDevNames
;++i
)
1138 free(allCaptureDevNameMap
[i
].name
);
1139 free(allCaptureDevNameMap
[i
].card
);
1142 free(allCaptureDevNameMap
);
1143 allCaptureDevNameMap
= probe_devices(SND_PCM_STREAM_CAPTURE
, &numCaptureDevNames
);
1145 for(i
= 0;i
< numCaptureDevNames
;++i
)
1146 AppendCaptureDeviceList(allCaptureDevNameMap
[i
].name
);