pulseaudio/src/pulsecore/core.c

/* $Id$ */

/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering
  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB

  PulseAudio 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.

  PulseAudio 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 PulseAudio; 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 <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <signal.h>

#include <pulse/timeval.h>
#include <pulse/xmalloc.h>

#include <pulsecore/module.h>
#include <pulsecore/sink.h>
#include <pulsecore/source.h>
#include <pulsecore/namereg.h>
#include <pulsecore/core-util.h>
#include <pulsecore/core-scache.h>
#include <pulsecore/autoload.h>
#include <pulsecore/core-subscribe.h>
#include <pulsecore/props.h>
#include <pulsecore/random.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>

#include "core.h"

static int core_process_msg(pa_msgobject *o, int code, void *userdata, pa_memchunk *chunk) {
    pa_core *c = PA_CORE(o);

    pa_core_assert_ref(c);
    
    switch (code) {
        
        case PA_CORE_MESSAGE_UNLOAD_MODULE:
            pa_module_unload(c, userdata);
            return 0;

        default:
            return -1;
    }
}

static void asyncmsgq_cb(pa_mainloop_api*api, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata) {
    pa_core *c = userdata;
    
    pa_assert(pa_asyncmsgq_get_fd(c->asyncmsgq) == fd);
    pa_assert(events == PA_IO_EVENT_INPUT);

    pa_asyncmsgq_after_poll(c->asyncmsgq);

    for (;;) {
        pa_msgobject *object;
        int code;
        void *data;
        pa_memchunk chunk;

        /* Check whether there is a message for us to process */
        while (pa_asyncmsgq_get(c->asyncmsgq, &object, &code, &data, &chunk, 0) == 0) {
            pa_asyncmsgq_dispatch(object, code, data, &chunk);
            pa_asyncmsgq_done(c->asyncmsgq, 0);
        }
        
        if (pa_asyncmsgq_before_poll(c->asyncmsgq) == 0)
            break;
    }
}

static void core_free(pa_object *o);

pa_core* pa_core_new(pa_mainloop_api *m, int shared) {
    pa_core* c;
    pa_mempool *pool;

    pa_assert(m);
    
    if (shared) {
        if (!(pool = pa_mempool_new(shared))) {
            pa_log_warn("failed to allocate shared memory pool. Falling back to a normal memory pool.");
            shared = 0;
        }
    }

    if (!shared) {
        if (!(pool = pa_mempool_new(shared))) {
            pa_log("pa_mempool_new() failed.");
            return NULL;
        }
    }

    c = pa_msgobject_new(pa_core);
    c->parent.parent.free = core_free;
    c->parent.process_msg = core_process_msg;

    c->mainloop = m;
    c->clients = pa_idxset_new(NULL, NULL);
    c->sinks = pa_idxset_new(NULL, NULL);
    c->sources = pa_idxset_new(NULL, NULL);
    c->source_outputs = pa_idxset_new(NULL, NULL);
    c->sink_inputs = pa_idxset_new(NULL, NULL);

    c->default_source_name = c->default_sink_name = NULL;

    c->modules = NULL;
    c->namereg = NULL;
    c->scache = NULL;
    c->autoload_idxset = NULL;
    c->autoload_hashmap = NULL;
    c->running_as_daemon = 0;

    c->default_sample_spec.format = PA_SAMPLE_S16NE;
    c->default_sample_spec.rate = 44100;
    c->default_sample_spec.channels = 2;

    c->module_auto_unload_event = NULL;
    c->module_defer_unload_event = NULL;
    c->scache_auto_unload_event = NULL;

    c->subscription_defer_event = NULL;
    PA_LLIST_HEAD_INIT(pa_subscription, c->subscriptions);
    PA_LLIST_HEAD_INIT(pa_subscription_event, c->subscription_event_queue);
    c->subscription_event_last = NULL;

    c->mempool = pool;

    c->disallow_module_loading = 0;

    c->quit_event = NULL;

    c->exit_idle_time = -1;
    c->module_idle_time = 20;
    c->scache_idle_time = 20;

    c->resample_method = PA_RESAMPLER_SRC_SINC_FASTEST;

    c->is_system_instance = 0;

    pa_hook_init(&c->hook_sink_input_new, c);
    pa_hook_init(&c->hook_sink_disconnect, c);
    pa_hook_init(&c->hook_source_output_new, c);
    pa_hook_init(&c->hook_source_disconnect, c);

    pa_property_init(c);

    pa_random(&c->cookie, sizeof(c->cookie));

#ifdef SIGPIPE
    pa_check_signal_is_blocked(SIGPIPE);
#endif

    pa_assert_se(c->asyncmsgq = pa_asyncmsgq_new(0));
    pa_assert_se(pa_asyncmsgq_before_poll(c->asyncmsgq) == 0);
    pa_assert_se(c->asyncmsgq_event = c->mainloop->io_new(c->mainloop, pa_asyncmsgq_get_fd(c->asyncmsgq), PA_IO_EVENT_INPUT, asyncmsgq_cb, c));
            
    return c;
}

static void core_free(pa_object *o) {
    pa_core *c = PA_CORE(o);
    pa_core_assert_ref(c);

    pa_module_unload_all(c);
    assert(!c->modules);

    assert(pa_idxset_isempty(c->clients));
    pa_idxset_free(c->clients, NULL, NULL);

    assert(pa_idxset_isempty(c->sinks));
    pa_idxset_free(c->sinks, NULL, NULL);

    assert(pa_idxset_isempty(c->sources));
    pa_idxset_free(c->sources, NULL, NULL);

    assert(pa_idxset_isempty(c->source_outputs));
    pa_idxset_free(c->source_outputs, NULL, NULL);

    assert(pa_idxset_isempty(c->sink_inputs));
    pa_idxset_free(c->sink_inputs, NULL, NULL);

    pa_scache_free(c);
    pa_namereg_free(c);
    pa_autoload_free(c);
    pa_subscription_free_all(c);

    if (c->quit_event)
        c->mainloop->time_free(c->quit_event);

    pa_xfree(c->default_source_name);
    pa_xfree(c->default_sink_name);

    pa_mempool_free(c->mempool);

    pa_property_cleanup(c);

    c->mainloop->io_free(c->asyncmsgq_event);
    pa_asyncmsgq_after_poll(c->asyncmsgq);
    pa_asyncmsgq_free(c->asyncmsgq);

    pa_hook_free(&c->hook_sink_input_new);
    pa_hook_free(&c->hook_sink_disconnect);
    pa_hook_free(&c->hook_source_output_new);
    pa_hook_free(&c->hook_source_disconnect);

    pa_xfree(c);
}

static void quit_callback(pa_mainloop_api*m, pa_time_event *e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
    pa_core *c = userdata;
    assert(c->quit_event = e);

    m->quit(m, 0);
}

void pa_core_check_quit(pa_core *c) {
    assert(c);

    if (!c->quit_event && c->exit_idle_time >= 0 && pa_idxset_size(c->clients) == 0) {
        struct timeval tv;
        pa_gettimeofday(&tv);
        tv.tv_sec+= c->exit_idle_time;
        c->quit_event = c->mainloop->time_new(c->mainloop, &tv, quit_callback, c);
    } else if (c->quit_event && pa_idxset_size(c->clients) > 0) {
        c->mainloop->time_free(c->quit_event);
        c->quit_event = NULL;
    }
}