4 This file is part of polypaudio.
6 polypaudio 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 polypaudio 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 polypaudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 #include <asoundlib.h>
38 #include "sample-util.h"
39 #include "alsa-util.h"
42 #include "module-alsa-source-symdef.h"
44 PA_MODULE_AUTHOR("Lennart Poettering")
45 PA_MODULE_DESCRIPTION("ALSA Source")
46 PA_MODULE_VERSION(PACKAGE_VERSION
)
47 PA_MODULE_USAGE("source_name=<name for the source> device=<ALSA device> format=<sample format> channels=<number of channels> rate=<sample rate> fragments=<number of fragments> fragment_size=<fragment size>")
50 snd_pcm_t
*pcm_handle
;
51 struct pa_source
*source
;
52 struct pa_io_event
**io_events
;
55 size_t frame_size
, fragment_size
;
56 struct pa_memchunk memchunk
;
57 struct pa_module
*module
;
60 static const char* const valid_modargs
[] = {
71 #define DEFAULT_SOURCE_NAME "alsa_input"
72 #define DEFAULT_DEVICE "hw:0,0"
74 static void update_usage(struct userdata
*u
) {
75 pa_module_set_used(u
->module
,
76 (u
->source
? pa_idxset_ncontents(u
->source
->outputs
) : 0));
79 static void xrun_recovery(struct userdata
*u
) {
82 pa_log(__FILE__
": *** ALSA-XRUN (capture) ***\n");
84 if (snd_pcm_prepare(u
->pcm_handle
) < 0)
85 pa_log(__FILE__
": snd_pcm_prepare() failed\n");
88 static void do_read(struct userdata
*u
) {
94 struct pa_memchunk post_memchunk
;
95 snd_pcm_sframes_t frames
;
98 if (!u
->memchunk
.memblock
) {
99 u
->memchunk
.memblock
= pa_memblock_new(u
->memchunk
.length
= u
->fragment_size
, u
->source
->core
->memblock_stat
);
100 u
->memchunk
.index
= 0;
103 assert(u
->memchunk
.memblock
&& u
->memchunk
.memblock
->data
&& u
->memchunk
.length
&& u
->memchunk
.memblock
->length
&& (u
->memchunk
.length
% u
->frame_size
) == 0);
105 if ((frames
= snd_pcm_readi(u
->pcm_handle
, (uint8_t*) u
->memchunk
.memblock
->data
+ u
->memchunk
.index
, u
->memchunk
.length
/ u
->frame_size
)) < 0) {
106 if (frames
== -EAGAIN
)
109 if (frames
== -EPIPE
) {
114 pa_log(__FILE__
": snd_pcm_readi() failed: %s\n", strerror(-frames
));
118 l
= frames
* u
->frame_size
;
120 post_memchunk
= u
->memchunk
;
121 post_memchunk
.length
= l
;
123 pa_source_post(u
->source
, &post_memchunk
);
125 u
->memchunk
.index
+= l
;
126 u
->memchunk
.length
-= l
;
128 if (u
->memchunk
.length
== 0) {
129 pa_memblock_unref(u
->memchunk
.memblock
);
130 u
->memchunk
.memblock
= NULL
;
131 u
->memchunk
.index
= u
->memchunk
.length
= 0;
138 static void io_callback(struct pa_mainloop_api
*a
, struct pa_io_event
*e
, int fd
, enum pa_io_event_flags f
, void *userdata
) {
139 struct userdata
*u
= userdata
;
142 if (snd_pcm_state(u
->pcm_handle
) == SND_PCM_STATE_XRUN
)
148 static pa_usec_t
source_get_latency_cb(struct pa_source
*s
) {
149 struct userdata
*u
= s
->userdata
;
150 snd_pcm_sframes_t frames
;
151 assert(s
&& u
&& u
->source
);
153 if (snd_pcm_delay(u
->pcm_handle
, &frames
) < 0) {
154 pa_log(__FILE__
": failed to get delay\n");
155 s
->get_latency
= NULL
;
159 return pa_bytes_to_usec(frames
* u
->frame_size
, &s
->sample_spec
);
162 int pa__init(struct pa_core
*c
, struct pa_module
*m
) {
163 struct pa_modargs
*ma
= NULL
;
165 struct userdata
*u
= NULL
;
167 struct pa_sample_spec ss
;
168 unsigned periods
, fragsize
;
169 snd_pcm_uframes_t buffer_size
;
172 if (!(ma
= pa_modargs_new(m
->argument
, valid_modargs
))) {
173 pa_log(__FILE__
": failed to parse module arguments\n");
177 ss
= c
->default_sample_spec
;
178 if (pa_modargs_get_sample_spec(ma
, &ss
) < 0) {
179 pa_log(__FILE__
": failed to parse sample specification\n");
182 frame_size
= pa_frame_size(&ss
);
186 if (pa_modargs_get_value_u32(ma
, "fragments", &periods
) < 0 || pa_modargs_get_value_u32(ma
, "fragment_size", &fragsize
) < 0) {
187 pa_log(__FILE__
": failed to parse buffer metrics\n");
190 buffer_size
= fragsize
/frame_size
*periods
;
192 u
= pa_xmalloc0(sizeof(struct userdata
));
196 if (snd_pcm_open(&u
->pcm_handle
, dev
= pa_modargs_get_value(ma
, "device", DEFAULT_DEVICE
), SND_PCM_STREAM_CAPTURE
, SND_PCM_NONBLOCK
) < 0) {
197 pa_log(__FILE__
": Error opening PCM device %s\n", dev
);
201 if (pa_alsa_set_hw_params(u
->pcm_handle
, &ss
, &periods
, &buffer_size
) < 0) {
202 pa_log(__FILE__
": Failed to set hardware parameters\n");
206 u
->source
= pa_source_new(c
, pa_modargs_get_value(ma
, "source_name", DEFAULT_SOURCE_NAME
), 0, &ss
);
209 u
->source
->userdata
= u
;
210 u
->source
->get_latency
= source_get_latency_cb
;
211 pa_source_set_owner(u
->source
, m
);
212 u
->source
->description
= pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev
);
214 if (pa_create_io_events(u
->pcm_handle
, c
->mainloop
, &u
->io_events
, &u
->n_io_events
, io_callback
, u
) < 0) {
215 pa_log(__FILE__
": failed to obtain file descriptors\n");
219 u
->frame_size
= frame_size
;
220 u
->fragment_size
= buffer_size
*u
->frame_size
/periods
;
222 pa_log(__FILE__
": using %u fragments of size %u bytes.\n", periods
, u
->fragment_size
);
224 u
->memchunk
.memblock
= NULL
;
225 u
->memchunk
.index
= u
->memchunk
.length
= 0;
227 snd_pcm_start(u
->pcm_handle
);
245 void pa__done(struct pa_core
*c
, struct pa_module
*m
) {
249 if (!(u
= m
->userdata
))
253 pa_source_disconnect(u
->source
);
254 pa_source_unref(u
->source
);
258 pa_free_io_events(c
->mainloop
, u
->io_events
, u
->n_io_events
);
261 snd_pcm_drop(u
->pcm_handle
);
262 snd_pcm_close(u
->pcm_handle
);
265 if (u
->memchunk
.memblock
)
266 pa_memblock_unref(u
->memchunk
.memblock
);