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 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 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 snd_pcm_t
*pcm_handle
;
43 struct pa_source
*source
;
45 unsigned n_io_sources
;
47 size_t frame_size
, fragment_size
;
48 struct pa_memchunk memchunk
;
51 static const char* const valid_modargs
[] = {
62 #define DEFAULT_SOURCE_NAME "alsa_input"
63 #define DEFAULT_DEVICE "hw:0,0"
65 static void xrun_recovery(struct userdata
*u
) {
68 fprintf(stderr
, "*** ALSA-XRUN (capture) ***\n");
70 if (snd_pcm_prepare(u
->pcm_handle
) < 0)
71 fprintf(stderr
, "snd_pcm_prepare() failed\n");
74 static void do_read(struct userdata
*u
) {
78 struct pa_memchunk post_memchunk
;
79 snd_pcm_sframes_t frames
;
82 if (!u
->memchunk
.memblock
) {
83 u
->memchunk
.memblock
= pa_memblock_new(u
->memchunk
.length
= u
->fragment_size
);
84 u
->memchunk
.index
= 0;
87 assert(u
->memchunk
.memblock
&& u
->memchunk
.memblock
->data
&& u
->memchunk
.length
&& u
->memchunk
.memblock
->length
&& (u
->memchunk
.length
% u
->frame_size
) == 0);
89 if ((frames
= snd_pcm_readi(u
->pcm_handle
, u
->memchunk
.memblock
->data
+ u
->memchunk
.index
, u
->memchunk
.length
/ u
->frame_size
)) < 0) {
90 if (frames
== -EAGAIN
)
93 if (frames
== -EPIPE
) {
98 fprintf(stderr
, "snd_pcm_readi() failed: %s\n", strerror(-frames
));
102 l
= frames
* u
->frame_size
;
104 post_memchunk
= u
->memchunk
;
105 post_memchunk
.length
= l
;
107 pa_source_post(u
->source
, &post_memchunk
);
109 u
->memchunk
.index
+= l
;
110 u
->memchunk
.length
-= l
;
112 if (u
->memchunk
.length
== 0) {
113 pa_memblock_unref(u
->memchunk
.memblock
);
114 u
->memchunk
.memblock
= NULL
;
115 u
->memchunk
.index
= u
->memchunk
.length
= 0;
122 static void io_callback(struct pa_mainloop_api
*a
, void *id
, int fd
, enum pa_mainloop_api_io_events events
, void *userdata
) {
123 struct userdata
*u
= userdata
;
124 assert(u
&& a
&& id
);
126 if (snd_pcm_state(u
->pcm_handle
) == SND_PCM_STATE_XRUN
)
132 int pa_module_init(struct pa_core
*c
, struct pa_module
*m
) {
133 struct pa_modargs
*ma
= NULL
;
135 struct userdata
*u
= NULL
;
137 struct pa_sample_spec ss
;
138 unsigned periods
, fragsize
;
139 snd_pcm_uframes_t buffer_size
;
142 if (!(ma
= pa_modargs_new(m
->argument
, valid_modargs
))) {
143 fprintf(stderr
, __FILE__
": failed to parse module arguments\n");
147 ss
= c
->default_sample_spec
;
148 if (pa_modargs_get_sample_spec(ma
, &ss
) < 0) {
149 fprintf(stderr
, __FILE__
": failed to parse sample specification\n");
152 frame_size
= pa_sample_size(&ss
);
156 if (pa_modargs_get_value_u32(ma
, "fragments", &periods
) < 0 || pa_modargs_get_value_u32(ma
, "fragment_size", &fragsize
) < 0) {
157 fprintf(stderr
, __FILE__
": failed to parse buffer metrics\n");
160 buffer_size
= fragsize
/frame_size
*periods
;
162 u
= malloc(sizeof(struct userdata
));
164 memset(u
, 0, sizeof(struct userdata
));
167 if (snd_pcm_open(&u
->pcm_handle
, dev
= pa_modargs_get_value(ma
, "device", DEFAULT_DEVICE
), SND_PCM_STREAM_CAPTURE
, SND_PCM_NONBLOCK
) < 0) {
168 fprintf(stderr
, __FILE__
": Error opening PCM device %s\n", dev
);
172 if (pa_alsa_set_hw_params(u
->pcm_handle
, &ss
, &periods
, &buffer_size
) < 0) {
173 fprintf(stderr
, __FILE__
": Failed to set hardware parameters\n");
177 u
->source
= pa_source_new(c
, pa_modargs_get_value(ma
, "source_name", DEFAULT_SOURCE_NAME
), 0, &ss
);
180 u
->source
->userdata
= u
;
181 pa_source_set_owner(u
->source
, m
);
182 u
->source
->description
= pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev
);
184 if (pa_create_io_sources(u
->pcm_handle
, c
->mainloop
, &u
->io_sources
, &u
->n_io_sources
, io_callback
, u
) < 0) {
185 fprintf(stderr
, __FILE__
": failed to obtain file descriptors\n");
189 u
->frame_size
= frame_size
;
190 u
->fragment_size
= buffer_size
*u
->frame_size
/periods
;
192 fprintf(stderr
, __FILE__
": using %u fragments of size %u bytes.\n", periods
, u
->fragment_size
);
194 u
->memchunk
.memblock
= NULL
;
195 u
->memchunk
.index
= u
->memchunk
.length
= 0;
197 snd_pcm_start(u
->pcm_handle
);
210 pa_module_done(c
, m
);
215 void pa_module_done(struct pa_core
*c
, struct pa_module
*m
) {
219 if ((u
= m
->userdata
)) {
221 pa_source_free(u
->source
);
224 pa_free_io_sources(c
->mainloop
, u
->io_sources
, u
->n_io_sources
);
227 snd_pcm_drop(u
->pcm_handle
);
228 snd_pcm_close(u
->pcm_handle
);
231 if (u
->memchunk
.memblock
)
232 pa_memblock_unref(u
->memchunk
.memblock
);