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module-null-source: New null-source module
This commit is contained in:
Marc-André Lureau
Colin Guthrie
parent
88e6078f3b
commit
4c3f7b0f30
2 changed files with 300 additions and 0 deletions
294
src/modules/module-null-source.c
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294
src/modules/module-null-source.c
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/***
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This file is part of PulseAudio.
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Copyright 2004-2008 Lennart Poettering
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Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
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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 <pulse/rtclock.h>
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#include <pulse/timeval.h>
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#include <pulse/xmalloc.h>
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#include <pulsecore/core-error.h>
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#include <pulsecore/core-rtclock.h>
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#include <pulsecore/core-util.h>
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#include <pulsecore/log.h>
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#include <pulsecore/macro.h>
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#include <pulsecore/modargs.h>
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#include <pulsecore/module.h>
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#include <pulsecore/rtpoll.h>
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#include <pulsecore/source.h>
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#include <pulsecore/thread-mq.h>
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#include <pulsecore/thread.h>
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#include "module-null-source-symdef.h"
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PA_MODULE_AUTHOR("Lennart Poettering & Marc-Andre Lureau");
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PA_MODULE_DESCRIPTION("Clocked NULL source");
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PA_MODULE_VERSION(PACKAGE_VERSION);
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PA_MODULE_LOAD_ONCE(FALSE);
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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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"source_name=<name of source> "
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"channel_map=<channel map> "
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"description=<description for the source> "
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"latency_time=<latency time in ms>");
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#define DEFAULT_SOURCE_NAME "source.null"
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#define DEFAULT_LATENCY_TIME 20
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#define MAX_LATENCY_USEC (PA_USEC_PER_SEC * 2)
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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_source *source;
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pa_thread *thread;
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pa_thread_mq thread_mq;
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pa_rtpoll *rtpoll;
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size_t block_size;
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pa_usec_t block_usec;
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pa_usec_t timestamp;
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pa_usec_t latency_time;
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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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"source_name",
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"channel_map",
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"description",
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"latency_time",
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NULL
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};
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static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
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struct userdata *u = PA_SOURCE(o)->userdata;
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switch (code) {
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case PA_SOURCE_MESSAGE_SET_STATE:
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if (PA_PTR_TO_UINT(data) == PA_SOURCE_RUNNING)
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u->timestamp = pa_rtclock_now();
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break;
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case PA_SOURCE_MESSAGE_GET_LATENCY: {
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pa_usec_t now;
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now = pa_rtclock_now();
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*((pa_usec_t*) data) = u->timestamp > now ? u->timestamp - now : 0;
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return 0;
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}
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}
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return pa_source_process_msg(o, code, data, offset, chunk);
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}
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static void source_update_requested_latency_cb(pa_source *s) {
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struct userdata *u;
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pa_source_assert_ref(s);
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u = s->userdata;
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pa_assert(u);
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u->block_usec = pa_source_get_requested_latency_within_thread(s);
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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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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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u->timestamp = pa_rtclock_now();
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for (;;) {
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int ret;
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/* Generate some null data */
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if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
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pa_usec_t now;
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pa_memchunk chunk;
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now = pa_rtclock_now();
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if ((chunk.length = pa_usec_to_bytes(now - u->timestamp, &u->source->sample_spec)) > 0) {
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chunk.memblock = pa_memblock_new(u->core->mempool, (size_t) -1); /* or chunk.length? */
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chunk.index = 0;
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pa_source_post(u->source, &chunk);
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pa_memblock_unref(chunk.memblock);
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u->timestamp = now;
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}
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pa_rtpoll_set_timer_absolute(u->rtpoll, u->timestamp + u->latency_time * PA_USEC_PER_MSEC);
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} else
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pa_rtpoll_set_timer_disabled(u->rtpoll);
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/* Hmm, nothing to do. Let's sleep */
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if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
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goto fail;
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if (ret == 0)
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goto finish;
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}
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fail:
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/* If this was no regular exit from the loop we have to continue
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* processing messages until we received PA_MESSAGE_SHUTDOWN */
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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_source_new_data data;
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uint32_t latency_time = DEFAULT_LATENCY_TIME;
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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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m->userdata = 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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u->rtpoll = pa_rtpoll_new();
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pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
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pa_source_new_data_init(&data);
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data.driver = __FILE__;
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data.module = m;
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pa_source_new_data_set_name(&data, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME));
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pa_source_new_data_set_sample_spec(&data, &ss);
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pa_source_new_data_set_channel_map(&data, &map);
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pa_proplist_sets(data.proplist, PA_PROP_DEVICE_DESCRIPTION, pa_modargs_get_value(ma, "description", "Null Input"));
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pa_proplist_sets(data.proplist, PA_PROP_DEVICE_CLASS, "abstract");
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u->source = pa_source_new(m->core, &data, PA_SOURCE_LATENCY | PA_SOURCE_DYNAMIC_LATENCY);
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pa_source_new_data_done(&data);
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if (!u->source) {
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pa_log("Failed to create source object.");
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goto fail;
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}
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u->latency_time = DEFAULT_LATENCY_TIME;
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if (pa_modargs_get_value_u32(ma, "latency_time", &latency_time) < 0) {
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pa_log("Failed to parse latency_time value.");
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goto fail;
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}
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u->latency_time = latency_time;
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u->source->parent.process_msg = source_process_msg;
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u->source->update_requested_latency = source_update_requested_latency_cb;
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u->source->userdata = u;
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pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
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pa_source_set_rtpoll(u->source, u->rtpoll);
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pa_source_set_latency_range(u->source, 0, MAX_LATENCY_USEC);
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u->block_usec = u->source->thread_info.max_latency;
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u->source->thread_info.max_rewind =
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pa_usec_to_bytes(u->block_usec, &u->source->sample_spec);
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if (!(u->thread = pa_thread_new("null-source", 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_source_put(u->source);
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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->source)
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pa_source_unlink(u->source);
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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->source)
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pa_source_unref(u->source);
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if (u->rtpoll)
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pa_rtpoll_free(u->rtpoll);
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pa_xfree(u);
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}
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