4 This file is part of PulseAudio.
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <sys/types.h>
27 #include <asoundlib.h>
29 #include <pulse/sample.h>
30 #include <pulse/xmalloc.h>
32 #include <pulsecore/log.h>
34 #include "alsa-util.h"
36 struct pa_alsa_fdlist
{
39 /* This is a temporary buffer used to avoid lots of mallocs */
40 struct pollfd
*work_fds
;
46 pa_defer_event
*defer
;
51 void (*cb
)(void *userdata
);
55 static void io_cb(pa_mainloop_api
*a
, pa_io_event
* e
, PA_GCC_UNUSED
int fd
, pa_io_event_flags_t events
, void *userdata
) {
56 struct pa_alsa_fdlist
*fdl
= (struct pa_alsa_fdlist
*)userdata
;
58 unsigned short revents
;
60 assert(a
&& fdl
&& (fdl
->pcm
|| fdl
->mixer
) && fdl
->fds
&& fdl
->work_fds
);
67 memcpy(fdl
->work_fds
, fdl
->fds
, sizeof(struct pollfd
) * fdl
->num_fds
);
69 for (i
= 0;i
< fdl
->num_fds
;i
++) {
70 if (e
== fdl
->ios
[i
]) {
71 if (events
& PA_IO_EVENT_INPUT
)
72 fdl
->work_fds
[i
].revents
|= POLLIN
;
73 if (events
& PA_IO_EVENT_OUTPUT
)
74 fdl
->work_fds
[i
].revents
|= POLLOUT
;
75 if (events
& PA_IO_EVENT_ERROR
)
76 fdl
->work_fds
[i
].revents
|= POLLERR
;
77 if (events
& PA_IO_EVENT_HANGUP
)
78 fdl
->work_fds
[i
].revents
|= POLLHUP
;
83 assert(i
!= fdl
->num_fds
);
86 err
= snd_pcm_poll_descriptors_revents(fdl
->pcm
, fdl
->work_fds
, fdl
->num_fds
, &revents
);
88 err
= snd_mixer_poll_descriptors_revents(fdl
->mixer
, fdl
->work_fds
, fdl
->num_fds
, &revents
);
91 pa_log_error("Unable to get poll revent: %s",
96 a
->defer_enable(fdl
->defer
, 1);
100 fdl
->cb(fdl
->userdata
);
102 snd_mixer_handle_events(fdl
->mixer
);
106 static void defer_cb(pa_mainloop_api
*a
, PA_GCC_UNUSED pa_defer_event
* e
, void *userdata
) {
107 struct pa_alsa_fdlist
*fdl
= (struct pa_alsa_fdlist
*)userdata
;
111 assert(a
&& fdl
&& (fdl
->pcm
|| fdl
->mixer
));
113 a
->defer_enable(fdl
->defer
, 0);
116 num_fds
= snd_pcm_poll_descriptors_count(fdl
->pcm
);
118 num_fds
= snd_mixer_poll_descriptors_count(fdl
->mixer
);
121 if (num_fds
!= fdl
->num_fds
) {
125 pa_xfree(fdl
->work_fds
);
126 fdl
->fds
= pa_xmalloc0(sizeof(struct pollfd
) * num_fds
);
127 fdl
->work_fds
= pa_xmalloc(sizeof(struct pollfd
) * num_fds
);
130 memset(fdl
->work_fds
, 0, sizeof(struct pollfd
) * num_fds
);
133 err
= snd_pcm_poll_descriptors(fdl
->pcm
, fdl
->work_fds
, num_fds
);
135 err
= snd_mixer_poll_descriptors(fdl
->mixer
, fdl
->work_fds
, num_fds
);
138 pa_log_error("Unable to get poll descriptors: %s",
145 if (memcmp(fdl
->fds
, fdl
->work_fds
, sizeof(struct pollfd
) * num_fds
) == 0)
149 for (i
= 0;i
< fdl
->num_fds
;i
++)
150 a
->io_free(fdl
->ios
[i
]);
151 if (num_fds
!= fdl
->num_fds
) {
153 fdl
->ios
= pa_xmalloc(sizeof(pa_io_event
*) * num_fds
);
157 fdl
->ios
= pa_xmalloc(sizeof(pa_io_event
*) * num_fds
);
162 temp
= fdl
->work_fds
;
163 fdl
->work_fds
= fdl
->fds
;
166 fdl
->num_fds
= num_fds
;
168 for (i
= 0;i
< num_fds
;i
++) {
169 fdl
->ios
[i
] = a
->io_new(a
, fdl
->fds
[i
].fd
,
170 ((fdl
->fds
[i
].events
& POLLIN
) ? PA_IO_EVENT_INPUT
: 0) |
171 ((fdl
->fds
[i
].events
& POLLOUT
) ? PA_IO_EVENT_OUTPUT
: 0),
177 struct pa_alsa_fdlist
*pa_alsa_fdlist_new(void) {
178 struct pa_alsa_fdlist
*fdl
;
180 fdl
= pa_xmalloc(sizeof(struct pa_alsa_fdlist
));
184 fdl
->work_fds
= NULL
;
198 void pa_alsa_fdlist_free(struct pa_alsa_fdlist
*fdl
) {
203 fdl
->m
->defer_free(fdl
->defer
);
209 for (i
= 0;i
< fdl
->num_fds
;i
++)
210 fdl
->m
->io_free(fdl
->ios
[i
]);
217 pa_xfree(fdl
->work_fds
);
222 int pa_alsa_fdlist_init_pcm(struct pa_alsa_fdlist
*fdl
, snd_pcm_t
*pcm_handle
, pa_mainloop_api
* m
, void (*cb
)(void *userdata
), void *userdata
) {
223 assert(fdl
&& pcm_handle
&& m
&& !fdl
->m
&& cb
);
225 fdl
->pcm
= pcm_handle
;
228 fdl
->defer
= m
->defer_new(m
, defer_cb
, fdl
);
232 fdl
->userdata
= userdata
;
237 int pa_alsa_fdlist_init_mixer(struct pa_alsa_fdlist
*fdl
, snd_mixer_t
*mixer_handle
, pa_mainloop_api
* m
) {
238 assert(fdl
&& mixer_handle
&& m
&& !fdl
->m
);
240 fdl
->mixer
= mixer_handle
;
243 fdl
->defer
= m
->defer_new(m
, defer_cb
, fdl
);
249 static int set_format(snd_pcm_t
*pcm_handle
, snd_pcm_hw_params_t
*hwparams
, pa_sample_format_t
*f
) {
251 static const snd_pcm_format_t format_trans
[] = {
252 [PA_SAMPLE_U8
] = SND_PCM_FORMAT_U8
,
253 [PA_SAMPLE_ALAW
] = SND_PCM_FORMAT_A_LAW
,
254 [PA_SAMPLE_ULAW
] = SND_PCM_FORMAT_MU_LAW
,
255 [PA_SAMPLE_S16LE
] = SND_PCM_FORMAT_S16_LE
,
256 [PA_SAMPLE_S16BE
] = SND_PCM_FORMAT_S16_BE
,
257 [PA_SAMPLE_FLOAT32LE
] = SND_PCM_FORMAT_FLOAT_LE
,
258 [PA_SAMPLE_FLOAT32BE
] = SND_PCM_FORMAT_FLOAT_BE
,
261 static const pa_sample_format_t try_order
[] = {
277 if ((ret
= snd_pcm_hw_params_set_format(pcm_handle
, hwparams
, format_trans
[*f
])) >= 0)
280 if (*f
== PA_SAMPLE_FLOAT32BE
)
281 *f
= PA_SAMPLE_FLOAT32LE
;
282 else if (*f
== PA_SAMPLE_FLOAT32LE
)
283 *f
= PA_SAMPLE_FLOAT32BE
;
284 else if (*f
== PA_SAMPLE_S16BE
)
285 *f
= PA_SAMPLE_S16LE
;
286 else if (*f
== PA_SAMPLE_S16LE
)
287 *f
= PA_SAMPLE_S16BE
;
291 if ((ret
= snd_pcm_hw_params_set_format(pcm_handle
, hwparams
, format_trans
[*f
])) >= 0)
296 for (i
= 0; try_order
[i
] != PA_SAMPLE_INVALID
; i
++) {
299 if ((ret
= snd_pcm_hw_params_set_format(pcm_handle
, hwparams
, format_trans
[*f
])) >= 0)
306 /* Set the hardware parameters of the given ALSA device. Returns the
307 * selected fragment settings in *period and *period_size */
308 int pa_alsa_set_hw_params(snd_pcm_t
*pcm_handle
, pa_sample_spec
*ss
, uint32_t *periods
, snd_pcm_uframes_t
*period_size
) {
310 snd_pcm_uframes_t buffer_size
;
311 unsigned int r
= ss
->rate
;
312 unsigned int c
= ss
->channels
;
313 pa_sample_format_t f
= ss
->format
;
314 snd_pcm_hw_params_t
*hwparams
;
321 buffer_size
= *periods
* *period_size
;
323 if ((ret
= snd_pcm_hw_params_malloc(&hwparams
)) < 0 ||
324 (ret
= snd_pcm_hw_params_any(pcm_handle
, hwparams
)) < 0 ||
325 (ret
= snd_pcm_hw_params_set_rate_resample(pcm_handle
, hwparams
, 0)) < 0 ||
326 (ret
= snd_pcm_hw_params_set_access(pcm_handle
, hwparams
, SND_PCM_ACCESS_RW_INTERLEAVED
)) < 0)
329 if ((ret
= set_format(pcm_handle
, hwparams
, &f
)) < 0)
332 if ((ret
= snd_pcm_hw_params_set_rate_near(pcm_handle
, hwparams
, &r
, NULL
)) < 0)
335 if ((ret
= snd_pcm_hw_params_set_channels_near(pcm_handle
, hwparams
, &c
)) < 0)
338 if ((*period_size
> 0 && (ret
= snd_pcm_hw_params_set_period_size_near(pcm_handle
, hwparams
, period_size
, NULL
)) < 0) ||
339 (*periods
> 0 && (ret
= snd_pcm_hw_params_set_buffer_size_near(pcm_handle
, hwparams
, &buffer_size
)) < 0))
342 if ((ret
= snd_pcm_hw_params(pcm_handle
, hwparams
)) < 0)
346 pa_log_warn("device doesn't support %u Hz, changed to %u Hz.", ss
->rate
, r
);
348 /* If the sample rate deviates too much, we need to resample */
349 if (r
< ss
->rate
*.95 || r
> ss
->rate
*1.05)
353 if (ss
->channels
!= c
) {
354 pa_log_warn("device doesn't support %u channels, changed to %u.", ss
->channels
, c
);
358 if (ss
->format
!= f
) {
359 pa_log_warn("device doesn't support sample format %s, changed to %s.", pa_sample_format_to_string(ss
->format
), pa_sample_format_to_string(f
));
363 if ((ret
= snd_pcm_prepare(pcm_handle
)) < 0)
366 if ((ret
= snd_pcm_hw_params_get_buffer_size(hwparams
, &buffer_size
)) < 0 ||
367 (ret
= snd_pcm_hw_params_get_period_size(hwparams
, period_size
, NULL
)) < 0)
370 assert(buffer_size
> 0);
371 assert(*period_size
> 0);
372 *periods
= buffer_size
/ *period_size
;
373 assert(*periods
> 0);
379 snd_pcm_hw_params_free(hwparams
);
384 int pa_alsa_prepare_mixer(snd_mixer_t
*mixer
, const char *dev
) {
387 assert(mixer
&& dev
);
389 if ((err
= snd_mixer_attach(mixer
, dev
)) < 0) {
390 pa_log_warn("Unable to attach to mixer %s: %s", dev
, snd_strerror(err
));
394 if ((err
= snd_mixer_selem_register(mixer
, NULL
, NULL
)) < 0) {
395 pa_log_warn("Unable to register mixer: %s", snd_strerror(err
));
399 if ((err
= snd_mixer_load(mixer
)) < 0) {
400 pa_log_warn("Unable to load mixer: %s", snd_strerror(err
));
407 snd_mixer_elem_t
*pa_alsa_find_elem(snd_mixer_t
*mixer
, const char *name
, const char *fallback
) {
408 snd_mixer_elem_t
*elem
;
409 snd_mixer_selem_id_t
*sid
= NULL
;
410 snd_mixer_selem_id_alloca(&sid
);
415 snd_mixer_selem_id_set_name(sid
, name
);
417 if (!(elem
= snd_mixer_find_selem(mixer
, sid
))) {
418 pa_log_warn("Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid
));
421 snd_mixer_selem_id_set_name(sid
, fallback
);
423 if (!(elem
= snd_mixer_find_selem(mixer
, sid
)))
424 pa_log_warn("Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid
));
429 pa_log_info("Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid
));