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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <stdio.h>
#include <sys/poll.h>
#include <asoundlib.h>
#include "module.h"
#include "core.h"
#include "memchunk.h"
#include "sink.h"
#include "modargs.h"
#include "util.h"
#include "sample-util.h"
#include "alsa-util.h"
struct userdata {
snd_pcm_t *pcm_handle;
struct pa_source *source;
void **io_sources;
unsigned n_io_sources;
size_t frame_size, fragment_size;
struct pa_memchunk memchunk;
};
static const char* const valid_modargs[] = {
"device",
"source_name",
"format",
"channels",
"rate",
"fragments",
"fragment_size",
NULL
};
#define DEFAULT_SOURCE_NAME "alsa_input"
#define DEFAULT_DEVICE "hw:0,0"
static void xrun_recovery(struct userdata *u) {
assert(u);
fprintf(stderr, "*** ALSA-XRUN (capture) ***\n");
if (snd_pcm_prepare(u->pcm_handle) < 0)
fprintf(stderr, "snd_pcm_prepare() failed\n");
}
static void do_read(struct userdata *u) {
assert(u);
for (;;) {
struct pa_memchunk post_memchunk;
snd_pcm_sframes_t frames;
size_t l;
if (!u->memchunk.memblock) {
u->memchunk.memblock = pa_memblock_new(u->memchunk.length = u->fragment_size);
u->memchunk.index = 0;
}
assert(u->memchunk.memblock && u->memchunk.memblock->data && u->memchunk.length && u->memchunk.memblock->length && (u->memchunk.length % u->frame_size) == 0);
if ((frames = snd_pcm_readi(u->pcm_handle, u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length / u->frame_size)) < 0) {
if (frames == -EAGAIN)
return;
if (frames == -EPIPE) {
xrun_recovery(u);
continue;
}
fprintf(stderr, "snd_pcm_readi() failed: %s\n", strerror(-frames));
return;
}
l = frames * u->frame_size;
post_memchunk = u->memchunk;
post_memchunk.length = l;
pa_source_post(u->source, &post_memchunk);
u->memchunk.index += l;
u->memchunk.length -= l;
if (u->memchunk.length == 0) {
pa_memblock_unref(u->memchunk.memblock);
u->memchunk.memblock = NULL;
u->memchunk.index = u->memchunk.length = 0;
}
break;
}
}
static void io_callback(struct pa_mainloop_api*a, void *id, int fd, enum pa_mainloop_api_io_events events, void *userdata) {
struct userdata *u = userdata;
assert(u && a && id);
if (snd_pcm_state(u->pcm_handle) == SND_PCM_STATE_XRUN)
xrun_recovery(u);
do_read(u);
}
int pa_module_init(struct pa_core *c, struct pa_module*m) {
struct pa_modargs *ma = NULL;
int ret = -1;
struct userdata *u = NULL;
const char *dev;
struct pa_sample_spec ss;
unsigned periods, fragsize;
snd_pcm_uframes_t buffer_size;
size_t frame_size;
if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
fprintf(stderr, __FILE__": failed to parse module arguments\n");
goto fail;
}
ss = c->default_sample_spec;
if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
fprintf(stderr, __FILE__": failed to parse sample specification\n");
goto fail;
}
frame_size = pa_sample_size(&ss);
periods = 12;
fragsize = 1024;
if (pa_modargs_get_value_u32(ma, "fragments", &periods) < 0 || pa_modargs_get_value_u32(ma, "fragment_size", &fragsize) < 0) {
fprintf(stderr, __FILE__": failed to parse buffer metrics\n");
goto fail;
}
buffer_size = fragsize/frame_size*periods;
u = malloc(sizeof(struct userdata));
assert(u);
memset(u, 0, sizeof(struct userdata));
m->userdata = u;
if (snd_pcm_open(&u->pcm_handle, dev = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK) < 0) {
fprintf(stderr, __FILE__": Error opening PCM device %s\n", dev);
goto fail;
}
if (pa_alsa_set_hw_params(u->pcm_handle, &ss, &periods, &buffer_size) < 0) {
fprintf(stderr, __FILE__": Failed to set hardware parameters\n");
goto fail;
}
u->source = pa_source_new(c, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss);
assert(u->source);
u->source->userdata = u;
pa_source_set_owner(u->source, m);
u->source->description = pa_sprintf_malloc("Advanced Linux Sound Architecture PCM on '%s'", dev);
if (pa_create_io_sources(u->pcm_handle, c->mainloop, &u->io_sources, &u->n_io_sources, io_callback, u) < 0) {
fprintf(stderr, __FILE__": failed to obtain file descriptors\n");
goto fail;
}
u->frame_size = frame_size;
u->fragment_size = buffer_size*u->frame_size/periods;
fprintf(stderr, __FILE__": using %u fragments of size %u bytes.\n", periods, u->fragment_size);
u->memchunk.memblock = NULL;
u->memchunk.index = u->memchunk.length = 0;
snd_pcm_start(u->pcm_handle);
ret = 0;
finish:
if (ma)
pa_modargs_free(ma);
return ret;
fail:
if (u)
pa_module_done(c, m);
goto finish;
}
void pa_module_done(struct pa_core *c, struct pa_module*m) {
struct userdata *u;
assert(c && m);
if ((u = m->userdata)) {
if (u->source)
pa_source_free(u->source);
if (u->io_sources)
pa_free_io_sources(c->mainloop, u->io_sources, u->n_io_sources);
if (u->pcm_handle) {
snd_pcm_drop(u->pcm_handle);
snd_pcm_close(u->pcm_handle);
}
if (u->memchunk.memblock)
pa_memblock_unref(u->memchunk.memblock);
free(u);
}
}
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