mirror of
https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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3eae9038eb
git-svn-id: file:///home/lennart/svn/public/pulseaudio/branches/lennart@1624 fefdeb5f-60dc-0310-8127-8f9354f1896f
286 lines
7.3 KiB
C
286 lines
7.3 KiB
C
/* $Id$ */
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/***
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This file is part of PulseAudio.
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Copyright 2004-2006 Lennart Poettering
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PulseAudio 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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PulseAudio 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 PulseAudio; 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 <stdlib.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/poll.h>
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#include <pulse/timeval.h>
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#include <pulse/xmalloc.h>
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#include <pulsecore/macro.h>
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#include <pulsecore/sink.h>
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#include <pulsecore/module.h>
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#include <pulsecore/core-util.h>
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#include <pulsecore/core-error.h>
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#include <pulsecore/modargs.h>
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#include <pulsecore/log.h>
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#include <pulsecore/thread.h>
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#include <pulsecore/thread-mq.h>
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#include "module-null-sink-symdef.h"
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PA_MODULE_AUTHOR("Lennart Poettering")
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PA_MODULE_DESCRIPTION("Clocked NULL sink")
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PA_MODULE_VERSION(PACKAGE_VERSION)
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PA_MODULE_USAGE(
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"format=<sample format> "
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"channels=<number of channels> "
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"rate=<sample rate> "
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"sink_name=<name of sink>"
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"channel_map=<channel map>"
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"description=<description for the sink>")
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#define DEFAULT_SINK_NAME "null"
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struct userdata {
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pa_core *core;
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pa_module *module;
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pa_sink *sink;
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pa_thread *thread;
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pa_thread_mq thread_mq;
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size_t block_size;
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struct timeval timestamp;
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};
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static const char* const valid_modargs[] = {
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"rate",
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"format",
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"channels",
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"sink_name",
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"channel_map",
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"description",
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NULL
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};
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static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
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struct userdata *u = PA_SINK(o)->userdata;
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switch (code) {
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case PA_SINK_MESSAGE_SET_STATE:
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if (PA_PTR_TO_UINT(data) == PA_SINK_RUNNING)
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pa_gettimeofday(&u->timestamp);
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break;
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case PA_SINK_MESSAGE_GET_LATENCY: {
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struct timeval now;
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pa_gettimeofday(&now);
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if (pa_timeval_cmp(&u->timestamp, &now) > 0)
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*((pa_usec_t*) data) = 0;
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else
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*((pa_usec_t*) data) = pa_timeval_diff(&u->timestamp, &now);
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break;
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}
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}
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return pa_sink_process_msg(o, code, data, offset, chunk);
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}
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static void thread_func(void *userdata) {
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struct userdata *u = userdata;
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struct pollfd pollfd;
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pa_assert(u);
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pa_log_debug("Thread starting up");
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pa_thread_mq_install(&u->thread_mq);
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pa_gettimeofday(&u->timestamp);
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memset(&pollfd, 0, sizeof(pollfd));
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pollfd.fd = pa_asyncmsgq_get_fd(u->thread_mq.inq);
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pollfd.events = POLLIN;
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for (;;) {
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pa_msgobject *object;
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int code;
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void *data;
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pa_memchunk chunk;
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int r, timeout;
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struct timeval now;
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int64_t offset;
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/* Check whether there is a message for us to process */
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if (pa_asyncmsgq_get(u->thread_mq.inq, &object, &code, &data, &offset, &chunk, 0) == 0) {
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int ret;
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if (!object && code == PA_MESSAGE_SHUTDOWN) {
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pa_asyncmsgq_done(u->thread_mq.inq, 0);
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goto finish;
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}
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ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk);
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pa_asyncmsgq_done(u->thread_mq.inq, ret);
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continue;
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}
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/* Render some data and drop it immediately */
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if (u->sink->thread_info.state == PA_SINK_RUNNING) {
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pa_gettimeofday(&now);
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if (pa_timeval_cmp(&u->timestamp, &now) <= 0) {
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pa_sink_render(u->sink, u->block_size, &chunk);
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pa_memblock_unref(chunk.memblock);
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pa_timeval_add(&u->timestamp, pa_bytes_to_usec(chunk.length, &u->sink->sample_spec));
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continue;
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}
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timeout = pa_timeval_diff(&u->timestamp, &now)/1000;
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if (timeout < 1)
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timeout = 1;
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} else
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timeout = -1;
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/* Hmm, nothing to do. Let's sleep */
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if (pa_asyncmsgq_before_poll(u->thread_mq.inq) < 0)
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continue;
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r = poll(&pollfd, 1, timeout);
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pa_asyncmsgq_after_poll(u->thread_mq.inq);
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if (r < 0) {
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if (errno == EINTR) {
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pollfd.revents = 0;
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continue;
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}
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pa_log("poll() failed: %s", pa_cstrerror(errno));
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goto fail;
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}
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pa_assert(r == 0 || pollfd.revents == POLLIN);
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}
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fail:
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/* We have to continue processing messages until we receive the
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* SHUTDOWN message */
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pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
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pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
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finish:
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pa_log_debug("Thread shutting down");
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}
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int pa__init(pa_module*m) {
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struct userdata *u = NULL;
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pa_sample_spec ss;
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pa_channel_map map;
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pa_modargs *ma = NULL;
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pa_assert(m);
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if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
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pa_log("Failed to parse module arguments.");
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goto fail;
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}
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ss = m->core->default_sample_spec;
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if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
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pa_log("Invalid sample format specification or channel map");
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goto fail;
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}
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u = pa_xnew0(struct userdata, 1);
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u->core = m->core;
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u->module = m;
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m->userdata = u;
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pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
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if (!(u->sink = pa_sink_new(m->core, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map))) {
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pa_log("Failed to create sink.");
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goto fail;
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}
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u->sink->parent.process_msg = sink_process_msg;
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u->sink->userdata = u;
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pa_sink_set_module(u->sink, m);
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pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
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pa_sink_set_description(u->sink, pa_modargs_get_value(ma, "description", "NULL sink"));
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u->block_size = pa_bytes_per_second(&ss) / 20; /* 50 ms */
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if (u->block_size <= 0)
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u->block_size = pa_frame_size(&ss);
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if (!(u->thread = pa_thread_new(thread_func, u))) {
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pa_log("Failed to create thread.");
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goto fail;
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}
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pa_modargs_free(ma);
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return 0;
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fail:
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if (ma)
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pa_modargs_free(ma);
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pa__done(m);
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return -1;
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}
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void pa__done(pa_module*m) {
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struct userdata *u;
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pa_assert(m);
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if (!(u = m->userdata))
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return;
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if (u->sink)
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pa_sink_disconnect(u->sink);
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if (u->thread) {
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pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
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pa_thread_free(u->thread);
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}
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pa_thread_mq_done(&u->thread_mq);
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if (u->sink)
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pa_sink_unref(u->sink);
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pa_xfree(u);
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}
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