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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 Lesser 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 Lesser 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 <sys/types.h>
#include <asoundlib.h>
#include "alsa-util.h"
#include "sample.h"
#include "xmalloc.h"
#include "log.h"
/* Set the hardware parameters of the given ALSA device. Returns the
* selected fragment settings in *period and *period_size */
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, const struct pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) {
int ret = -1;
snd_pcm_uframes_t buffer_size;
snd_pcm_hw_params_t *hwparams = NULL;
static const snd_pcm_format_t format_trans[] = {
[PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
[PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
[PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
[PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
[PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
[PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
[PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
};
assert(pcm_handle && ss && periods && period_size);
if (snd_pcm_hw_params_malloc(&hwparams) < 0 ||
snd_pcm_hw_params_any(pcm_handle, hwparams) < 0 ||
snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ||
snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format]) < 0 ||
snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &ss->rate, NULL) < 0 ||
snd_pcm_hw_params_set_channels(pcm_handle, hwparams, ss->channels) < 0 ||
(*periods > 0 && snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, periods, NULL) < 0) ||
(*period_size > 0 && snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL) < 0) ||
snd_pcm_hw_params(pcm_handle, hwparams) < 0)
goto finish;
if (snd_pcm_prepare(pcm_handle) < 0)
goto finish;
if (snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size) < 0 ||
snd_pcm_hw_params_get_period_size(hwparams, period_size, NULL) < 0)
goto finish;
assert(buffer_size > 0);
assert(*period_size > 0);
*periods = buffer_size / *period_size;
assert(*periods > 0);
ret = 0;
finish:
if (hwparams)
snd_pcm_hw_params_free(hwparams);
return ret;
}
/* Allocate an IO event for every ALSA poll descriptor for the
* specified ALSA device. Return a pointer to such an array in
* *io_events. Store the length of that array in *n_io_events. Use the
* specified callback function and userdata. The array has to be freed
* with pa_free_io_events(). */
int pa_create_io_events(snd_pcm_t *pcm_handle, struct pa_mainloop_api* m, struct pa_io_event ***io_events, unsigned *n_io_events, void (*cb)(struct pa_mainloop_api*a, struct pa_io_event *e, int fd, enum pa_io_event_flags events, void *userdata), void *userdata) {
unsigned i;
struct pollfd *pfds, *ppfd;
struct pa_io_event **ios;
assert(pcm_handle && m && io_events && n_io_events && cb);
*n_io_events = snd_pcm_poll_descriptors_count(pcm_handle);
pfds = pa_xmalloc(sizeof(struct pollfd) * *n_io_events);
if (snd_pcm_poll_descriptors(pcm_handle, pfds, *n_io_events) < 0) {
pa_xfree(pfds);
return -1;
}
*io_events = pa_xmalloc(sizeof(void*) * *n_io_events);
for (i = 0, ios = *io_events, ppfd = pfds; i < *n_io_events; i++, ios++, ppfd++) {
*ios = m->io_new(m, ppfd->fd,
((ppfd->events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
((ppfd->events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0), cb, userdata);
assert(*ios);
}
pa_xfree(pfds);
return 0;
}
/* Free the memory allocated by pa_create_io_events() */
void pa_free_io_events(struct pa_mainloop_api* m, struct pa_io_event **io_events, unsigned n_io_events) {
unsigned i;
struct pa_io_event **ios;
assert(m && io_events);
for (ios = io_events, i = 0; i < n_io_events; i++, ios++)
m->io_free(*ios);
pa_xfree(io_events);
}
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