mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
synced 2025-10-31 22:25:33 -04:00
a529b281eb
git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1020 fefdeb5f-60dc-0310-8127-8f9354f1896f
421 lines
12 KiB
C
421 lines
12 KiB
C
/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <sys/types.h>
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#include <asoundlib.h>
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#include <polyp/sample.h>
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#include <polyp/xmalloc.h>
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#include <polypcore/log.h>
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#include "alsa-util.h"
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struct pa_alsa_fdlist {
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int num_fds;
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struct pollfd *fds;
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/* This is a temporary buffer used to avoid lots of mallocs */
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struct pollfd *work_fds;
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snd_pcm_t *pcm;
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snd_mixer_t *mixer;
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pa_mainloop_api *m;
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pa_defer_event *defer;
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pa_io_event **ios;
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int polled;
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void (*cb)(void *userdata);
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void *userdata;
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};
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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) {
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struct pa_alsa_fdlist *fdl = (struct pa_alsa_fdlist*)userdata;
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int err, i;
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unsigned short revents;
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assert(a && fdl && (fdl->pcm || fdl->mixer) && fdl->fds && fdl->work_fds);
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if (fdl->polled)
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return;
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fdl->polled = 1;
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memcpy(fdl->work_fds, fdl->fds, sizeof(struct pollfd) * fdl->num_fds);
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for (i = 0;i < fdl->num_fds;i++) {
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if (e == fdl->ios[i]) {
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if (events & PA_IO_EVENT_INPUT)
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fdl->work_fds[i].revents |= POLLIN;
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if (events & PA_IO_EVENT_OUTPUT)
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fdl->work_fds[i].revents |= POLLOUT;
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if (events & PA_IO_EVENT_ERROR)
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fdl->work_fds[i].revents |= POLLERR;
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if (events & PA_IO_EVENT_HANGUP)
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fdl->work_fds[i].revents |= POLLHUP;
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break;
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}
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}
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assert(i != fdl->num_fds);
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if (fdl->pcm)
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err = snd_pcm_poll_descriptors_revents(fdl->pcm, fdl->work_fds, fdl->num_fds, &revents);
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else
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err = snd_mixer_poll_descriptors_revents(fdl->mixer, fdl->work_fds, fdl->num_fds, &revents);
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if (err < 0) {
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pa_log_error(__FILE__": Unable to get poll revent: %s",
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snd_strerror(err));
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return;
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}
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if (revents) {
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if (fdl->pcm)
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fdl->cb(fdl->userdata);
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else
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snd_mixer_handle_events(fdl->mixer);
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}
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a->defer_enable(fdl->defer, 1);
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}
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static void defer_cb(pa_mainloop_api*a, PA_GCC_UNUSED pa_defer_event* e, void *userdata) {
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struct pa_alsa_fdlist *fdl = (struct pa_alsa_fdlist*)userdata;
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int num_fds, i, err;
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struct pollfd *temp;
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assert(a && fdl && (fdl->pcm || fdl->mixer));
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a->defer_enable(fdl->defer, 0);
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if (fdl->pcm)
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num_fds = snd_pcm_poll_descriptors_count(fdl->pcm);
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else
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num_fds = snd_mixer_poll_descriptors_count(fdl->mixer);
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assert(num_fds > 0);
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if (num_fds != fdl->num_fds) {
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if (fdl->fds)
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pa_xfree(fdl->fds);
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if (fdl->work_fds)
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pa_xfree(fdl->work_fds);
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fdl->fds = pa_xmalloc0(sizeof(struct pollfd) * num_fds);
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fdl->work_fds = pa_xmalloc(sizeof(struct pollfd) * num_fds);
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}
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memset(fdl->work_fds, 0, sizeof(struct pollfd) * num_fds);
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if (fdl->pcm)
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err = snd_pcm_poll_descriptors(fdl->pcm, fdl->work_fds, num_fds);
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else
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err = snd_mixer_poll_descriptors(fdl->mixer, fdl->work_fds, num_fds);
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if (err < 0) {
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pa_log_error(__FILE__": Unable to get poll descriptors: %s",
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snd_strerror(err));
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return;
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}
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fdl->polled = 0;
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if (memcmp(fdl->fds, fdl->work_fds, sizeof(struct pollfd) * num_fds) == 0)
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return;
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if (fdl->ios) {
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for (i = 0;i < fdl->num_fds;i++)
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a->io_free(fdl->ios[i]);
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if (num_fds != fdl->num_fds) {
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pa_xfree(fdl->ios);
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fdl->ios = pa_xmalloc(sizeof(pa_io_event*) * num_fds);
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assert(fdl->ios);
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}
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} else {
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fdl->ios = pa_xmalloc(sizeof(pa_io_event*) * num_fds);
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assert(fdl->ios);
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}
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/* Swap pointers */
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temp = fdl->work_fds;
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fdl->work_fds = fdl->fds;
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fdl->fds = temp;
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fdl->num_fds = num_fds;
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for (i = 0;i < num_fds;i++) {
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fdl->ios[i] = a->io_new(a, fdl->fds[i].fd,
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((fdl->fds[i].events & POLLIN) ? PA_IO_EVENT_INPUT : 0) |
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((fdl->fds[i].events & POLLOUT) ? PA_IO_EVENT_OUTPUT : 0),
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io_cb, fdl);
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assert(fdl->ios[i]);
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}
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}
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struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
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struct pa_alsa_fdlist *fdl;
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fdl = pa_xmalloc(sizeof(struct pa_alsa_fdlist));
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assert(fdl);
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fdl->num_fds = 0;
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fdl->fds = NULL;
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fdl->work_fds = NULL;
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fdl->pcm = NULL;
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fdl->mixer = NULL;
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fdl->m = NULL;
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fdl->defer = NULL;
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fdl->ios = NULL;
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fdl->polled = 0;
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return fdl;
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}
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void pa_alsa_fdlist_free(struct pa_alsa_fdlist *fdl) {
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assert(fdl);
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if (fdl->defer) {
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assert(fdl->m);
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fdl->m->defer_free(fdl->defer);
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}
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if (fdl->ios) {
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int i;
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assert(fdl->m);
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for (i = 0;i < fdl->num_fds;i++)
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fdl->m->io_free(fdl->ios[0]);
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pa_xfree(fdl->ios);
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}
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if (fdl->fds)
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pa_xfree(fdl->fds);
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if (fdl->work_fds)
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pa_xfree(fdl->work_fds);
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pa_xfree(fdl);
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}
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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) {
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assert(fdl && pcm_handle && m && !fdl->m && cb);
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fdl->pcm = pcm_handle;
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fdl->m = m;
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fdl->defer = m->defer_new(m, defer_cb, fdl);
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assert(fdl->defer);
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fdl->cb = cb;
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fdl->userdata = userdata;
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return 0;
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}
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int pa_alsa_fdlist_init_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_handle, pa_mainloop_api* m) {
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assert(fdl && mixer_handle && m && !fdl->m);
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fdl->mixer = mixer_handle;
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fdl->m = m;
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fdl->defer = m->defer_new(m, defer_cb, fdl);
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assert(fdl->defer);
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return 0;
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}
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static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
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static const snd_pcm_format_t format_trans[] = {
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[PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
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[PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
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[PA_SAMPLE_ULAW] = SND_PCM_FORMAT_MU_LAW,
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[PA_SAMPLE_S16LE] = SND_PCM_FORMAT_S16_LE,
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[PA_SAMPLE_S16BE] = SND_PCM_FORMAT_S16_BE,
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[PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
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[PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
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};
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static const pa_sample_format_t try_order[] = {
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PA_SAMPLE_S16NE,
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PA_SAMPLE_S16RE,
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PA_SAMPLE_FLOAT32NE,
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PA_SAMPLE_FLOAT32RE,
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PA_SAMPLE_ULAW,
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PA_SAMPLE_ALAW,
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PA_SAMPLE_U8,
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PA_SAMPLE_INVALID
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};
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int i, ret;
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assert(pcm_handle);
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assert(f);
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if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
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return ret;
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if (*f == PA_SAMPLE_FLOAT32BE)
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*f = PA_SAMPLE_FLOAT32LE;
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else if (*f == PA_SAMPLE_FLOAT32LE)
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*f = PA_SAMPLE_FLOAT32BE;
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else if (*f == PA_SAMPLE_S16BE)
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*f = PA_SAMPLE_S16LE;
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else if (*f == PA_SAMPLE_S16LE)
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*f = PA_SAMPLE_S16BE;
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else
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goto try_auto;
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if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
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return ret;
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try_auto:
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for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
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*f = try_order[i];
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if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
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return ret;
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}
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return -1;
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}
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/* Set the hardware parameters of the given ALSA device. Returns the
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* selected fragment settings in *period and *period_size */
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int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) {
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int ret = -1;
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snd_pcm_uframes_t buffer_size;
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unsigned int r = ss->rate;
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unsigned int c = ss->channels;
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pa_sample_format_t f = ss->format;
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snd_pcm_hw_params_t *hwparams;
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assert(pcm_handle);
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assert(ss);
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assert(periods);
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assert(period_size);
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buffer_size = *periods * *period_size;
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if ((ret = snd_pcm_hw_params_malloc(&hwparams)) < 0 ||
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(ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0 ||
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(ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0 ||
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(ret = set_format(pcm_handle, hwparams, &f)) < 0 ||
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(ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0 ||
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(*period_size > 0 && (ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL)) < 0) ||
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(*periods > 0 && (ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0) ||
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(ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
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goto finish;
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if (ss->rate != r) {
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pa_log_warn(__FILE__": device doesn't support %u Hz, changed to %u Hz.", ss->rate, r);
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/* If the sample rate deviates too much, we need to resample */
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if (r < ss->rate*.95 || r > ss->rate*1.05)
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ss->rate = r;
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}
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if (ss->channels != c) {
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pa_log_warn(__FILE__": device doesn't support %u channels, changed to %u.", ss->channels, c);
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ss->channels = c;
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}
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if (ss->format != f) {
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pa_log_warn(__FILE__": device doesn't support sample format %s, changed to %s.", pa_sample_format_to_string(ss->format), pa_sample_format_to_string(f));
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ss->format = f;
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}
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if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
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goto finish;
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if ((ret = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size)) < 0 ||
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(ret = snd_pcm_hw_params_get_period_size(hwparams, period_size, NULL)) < 0)
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goto finish;
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assert(buffer_size > 0);
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assert(*period_size > 0);
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*periods = buffer_size / *period_size;
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assert(*periods > 0);
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ret = 0;
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finish:
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if (hwparams)
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snd_pcm_hw_params_free(hwparams);
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return ret;
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}
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int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev) {
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int err;
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assert(mixer && dev);
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if ((err = snd_mixer_attach(mixer, dev)) < 0) {
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pa_log_warn(__FILE__": Unable to attach to mixer %s: %s", dev, snd_strerror(err));
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return -1;
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}
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if ((err = snd_mixer_selem_register(mixer, NULL, NULL)) < 0) {
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pa_log_warn(__FILE__": Unable to register mixer: %s", snd_strerror(err));
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return -1;
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}
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if ((err = snd_mixer_load(mixer)) < 0) {
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pa_log_warn(__FILE__": Unable to load mixer: %s", snd_strerror(err));
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return -1;
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}
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return 0;
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}
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snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback) {
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snd_mixer_elem_t *elem;
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snd_mixer_selem_id_t *sid = NULL;
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snd_mixer_selem_id_alloca(&sid);
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assert(mixer);
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assert(name);
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snd_mixer_selem_id_set_name(sid, name);
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if (!(elem = snd_mixer_find_selem(mixer, sid))) {
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pa_log_warn(__FILE__": Cannot find mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
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if (fallback) {
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snd_mixer_selem_id_set_name(sid, fallback);
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if (!(elem = snd_mixer_find_selem(mixer, sid)))
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pa_log_warn(__FILE__": Cannot find fallback mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
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}
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}
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if (elem)
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pa_log_info(__FILE__": Using mixer control \"%s\".", snd_mixer_selem_id_get_name(sid));
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return elem;
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}
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