C++ pa_xfree函数代码示例

static void subscribe_callback(pa_core *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
    struct userdata *u =  userdata;
    pa_sink_input *si = NULL;
    pa_source_output *so = NULL;
    struct rule *r;
    char *name;

    pa_assert(c);
    pa_assert(u);

    if (t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_NEW) &&
        t != (PA_SUBSCRIPTION_EVENT_SINK_INPUT|PA_SUBSCRIPTION_EVENT_CHANGE) &&
        t != (PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_NEW) &&
        t != (PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT|PA_SUBSCRIPTION_EVENT_CHANGE))
        return;

    if ((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SINK_INPUT) {
        if (!(si = pa_idxset_get_by_index(c->sink_inputs, idx)))
            return;

        if (!si->client || !(name = client_name(si->client)))
            return;
    } else {
        pa_assert((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SOURCE_OUTPUT);

        if (!(so = pa_idxset_get_by_index(c->source_outputs, idx)))
            return;

        if (!so->client || !(name = client_name(so->client)))
            return;
    }

    if ((r = pa_hashmap_get(u->hashmap, name))) {
        pa_xfree(name);

        if (si) {

            if (!r->volume_is_set || !pa_cvolume_equal(pa_sink_input_get_volume(si), &r->volume)) {
                pa_log_info("Saving volume for <%s>", r->name);
                r->volume = *pa_sink_input_get_volume(si);
                r->volume_is_set = TRUE;
                u->modified = TRUE;
            }

            if (!r->sink || strcmp(si->sink->name, r->sink) != 0) {
                pa_log_info("Saving sink for <%s>", r->name);
                pa_xfree(r->sink);
                r->sink = pa_xstrdup(si->sink->name);
                u->modified = TRUE;
            }
        } else {
            pa_assert(so);

            if (!r->source || strcmp(so->source->name, r->source) != 0) {
                pa_log_info("Saving source for <%s>", r->name);
                pa_xfree(r->source);
                r->source = pa_xstrdup(so->source->name);
                u->modified = TRUE;
            }
        }

    } else {
        pa_log_info("Creating new entry for <%s>", name);

        r = pa_xnew(struct rule, 1);
        r->name = name;

        if (si) {
            r->volume = *pa_sink_input_get_volume(si);
            r->volume_is_set = TRUE;
            r->sink = pa_xstrdup(si->sink->name);
            r->source = NULL;
        } else {
            pa_assert(so);
            r->volume_is_set = FALSE;
            r->sink = NULL;
            r->source = pa_xstrdup(so->source->name);
        }

        pa_hashmap_put(u->hashmap, r->name, r);
        u->modified = TRUE;
    }

    if (u->modified && !u->save_time_event) {
        struct timeval tv;
        pa_gettimeofday(&tv);
        tv.tv_sec += SAVE_INTERVAL;
        u->save_time_event = u->core->mainloop->time_new(u->core->mainloop, &tv, save_time_callback, u);
    }
}

//.........这里部分代码省略.........

    pa_source_output_new_data_init(&data);
    pa_proplist_sets(data.proplist, PA_PROP_MEDIA_NAME, "RTP Monitor Stream");
    pa_proplist_sets(data.proplist, "rtp.source", src_addr);
    pa_proplist_sets(data.proplist, "rtp.destination", dst_addr);
    pa_proplist_setf(data.proplist, "rtp.mtu", "%lu", (unsigned long) mtu);
    pa_proplist_setf(data.proplist, "rtp.port", "%lu", (unsigned long) port);
    pa_proplist_setf(data.proplist, "rtp.ttl", "%lu", (unsigned long) ttl);
    data.driver = __FILE__;
    data.module = m;
    pa_source_output_new_data_set_source(&data, s, false, true);
    pa_source_output_new_data_set_sample_spec(&data, &ss);
    pa_source_output_new_data_set_channel_map(&data, &cm);
    data.flags |= get_dont_inhibit_auto_suspend_flag(s, inhibit_auto_suspend);

    pa_source_output_new(&o, m->core, &data);
    pa_source_output_new_data_done(&data);

    if (!o) {
        pa_log("failed to create source output.");
        goto fail;
    }

    o->parent.process_msg = source_output_process_msg;
    o->push = source_output_push_cb;
    o->moving = source_output_moving_cb;
    o->kill = source_output_kill_cb;

    pa_log_info("Configured source latency of %llu ms.",
                (unsigned long long) pa_source_output_set_requested_latency(o, pa_bytes_to_usec(mtu, &o->sample_spec)) / PA_USEC_PER_MSEC);

    m->userdata = o->userdata = u = pa_xnew(struct userdata, 1);
    u->module = m;
    u->source_output = o;

    u->memblockq = pa_memblockq_new(
            "module-rtp-send memblockq",
            0,
            MEMBLOCKQ_MAXLENGTH,
            MEMBLOCKQ_MAXLENGTH,
            &ss,
            1,
            0,
            0,
            NULL);

    u->mtu = mtu;

    k = sizeof(sa_dst);
    pa_assert_se((r = getsockname(fd, (struct sockaddr*) &sa_dst, &k)) >= 0);

    n = pa_xstrdup(pa_modargs_get_value(ma, "stream_name", NULL));
    if (n == NULL)
        n = pa_sprintf_malloc("PulseAudio RTP Stream on %s", pa_get_fqdn(hn, sizeof(hn)));

    if (af == AF_INET) {
        p = pa_sdp_build(af,
                     (void*) &((struct sockaddr_in*) &sa_dst)->sin_addr,
                     (void*) &dst_sa4.sin_addr,
                     n, (uint16_t) port, payload, &ss);
#ifdef HAVE_IPV6
    } else {
        p = pa_sdp_build(af,
                     (void*) &((struct sockaddr_in6*) &sa_dst)->sin6_addr,
                     (void*) &dst_sa6.sin6_addr,
                     n, (uint16_t) port, payload, &ss);
#endif
    }

    pa_xfree(n);

    pa_rtp_context_init_send(&u->rtp_context, fd, m->core->cookie, payload, pa_frame_size(&ss));
    pa_sap_context_init_send(&u->sap_context, sap_fd, p);

    pa_log_info("RTP stream initialized with mtu %u on %s:%u from %s ttl=%u, SSRC=0x%08x, payload=%u, initial sequence #%u", mtu, dst_addr, port, src_addr, ttl, u->rtp_context.ssrc, payload, u->rtp_context.sequence);
    pa_log_info("SDP-Data:\n%s\nEOF", p);

    pa_sap_send(&u->sap_context, 0);

    u->sap_event = pa_core_rttime_new(m->core, pa_rtclock_now() + SAP_INTERVAL, sap_event_cb, u);
    u->inhibit_auto_suspend = inhibit_auto_suspend;

    pa_source_output_put(u->source_output);

    pa_modargs_free(ma);

    return 0;

fail:
    if (ma)
        pa_modargs_free(ma);

    if (fd >= 0)
        pa_close(fd);

    if (sap_fd >= 0)
        pa_close(sap_fd);

    return -1;
}

int pa_cmdline_parse(pa_daemon_conf *conf, int argc, char *const argv [], int *d) {
    pa_strbuf *buf = NULL;
    int c;
    int b;

    pa_assert(conf);
    pa_assert(argc > 0);
    pa_assert(argv);

    buf = pa_strbuf_new();

    if (conf->script_commands)
        pa_strbuf_puts(buf, conf->script_commands);

    while ((c = getopt_long(argc, argv, "L:F:ChDnp:kv", long_options, NULL)) != -1) {
        switch (c) {
            case ARG_HELP:
            case 'h':
                conf->cmd = PA_CMD_HELP;
                break;

            case ARG_VERSION:
                conf->cmd = PA_CMD_VERSION;
                break;

            case ARG_DUMP_CONF:
                conf->cmd = PA_CMD_DUMP_CONF;
                break;

            case ARG_DUMP_MODULES:
                conf->cmd = PA_CMD_DUMP_MODULES;
                break;

            case ARG_DUMP_RESAMPLE_METHODS:
                conf->cmd = PA_CMD_DUMP_RESAMPLE_METHODS;
                break;

            case ARG_CLEANUP_SHM:
                conf->cmd = PA_CMD_CLEANUP_SHM;
                break;

            case 'k':
            case ARG_KILL:
                conf->cmd = PA_CMD_KILL;
                break;

            case ARG_START:
                conf->cmd = PA_CMD_START;
                conf->daemonize = true;
                break;

            case ARG_CHECK:
                conf->cmd = PA_CMD_CHECK;
                break;

            case ARG_LOAD:
            case 'L':
                pa_strbuf_printf(buf, "load-module %s\n", optarg);
                break;

            case ARG_FILE:
            case 'F': {
                char *p;
                pa_strbuf_printf(buf, ".include %s\n", p = pa_make_path_absolute(optarg));
                pa_xfree(p);
                break;
            }

            case 'C':
                pa_strbuf_puts(buf, "load-module module-cli exit_on_eof=1\n");
                break;

            case ARG_DAEMONIZE:
            case 'D':
                if ((b = optarg ? pa_parse_boolean(optarg) : 1) < 0) {
                    pa_log(_("--daemonize expects boolean argument"));
                    goto fail;
                }
                conf->daemonize = !!b;
                break;

            case ARG_FAIL:
                if ((b = optarg ? pa_parse_boolean(optarg) : 1) < 0) {
                    pa_log(_("--fail expects boolean argument"));
                    goto fail;
                }
                conf->fail = !!b;
                break;

            case 'v':
            case ARG_LOG_LEVEL:

                if (optarg) {
                    if (pa_daemon_conf_set_log_level(conf, optarg) < 0) {
                        pa_log(_("--log-level expects log level argument (either numeric in range 0..4 or one of debug, info, notice, warn, error)."));
                        goto fail;
                    }
                } else {
                    if (conf->log_level < PA_LOG_LEVEL_MAX-1)
                        conf->log_level++;
//.........这里部分代码省略.........

int main(int argc, char *argv[]) {
    pa_mainloop* m = NULL;
    int ret = 1, c;
    char *bn, *server = NULL;
    pa_time_event *time_event = NULL;
    const char *filename = NULL;
    /* type for pa_read/_write. passed as userdata to the callbacks */
    unsigned long type = 0;

    static const struct option long_options[] = {
        {"record",       0, NULL, 'r'},
        {"playback",     0, NULL, 'p'},
        {"device",       1, NULL, 'd'},
        {"server",       1, NULL, 's'},
        {"client-name",  1, NULL, 'n'},
        {"stream-name",  1, NULL, ARG_STREAM_NAME},
        {"version",      0, NULL, ARG_VERSION},
        {"help",         0, NULL, 'h'},
        {"verbose",      0, NULL, 'v'},
        {"volume",       1, NULL, ARG_VOLUME},
        {"rate",         1, NULL, ARG_SAMPLERATE},
        {"format",       1, NULL, ARG_SAMPLEFORMAT},
        {"channels",     1, NULL, ARG_CHANNELS},
        {"channel-map",  1, NULL, ARG_CHANNELMAP},
        {"fix-format",   0, NULL, ARG_FIX_FORMAT},
        {"fix-rate",     0, NULL, ARG_FIX_RATE},
        {"fix-channels", 0, NULL, ARG_FIX_CHANNELS},
        {"no-remap",     0, NULL, ARG_NO_REMAP},
        {"no-remix",     0, NULL, ARG_NO_REMIX},
        {"latency",      1, NULL, ARG_LATENCY},
        {"process-time", 1, NULL, ARG_PROCESS_TIME},
        {"property",     1, NULL, ARG_PROPERTY},
        {"raw",          0, NULL, ARG_RAW},
        {"passthrough",  0, NULL, ARG_PASSTHROUGH},
        {"file-format",  2, NULL, ARG_FILE_FORMAT},
        {"list-file-formats", 0, NULL, ARG_LIST_FILE_FORMATS},
        {"latency-msec", 1, NULL, ARG_LATENCY_MSEC},
        {"process-time-msec", 1, NULL, ARG_PROCESS_TIME_MSEC},
        {"monitor-stream", 1, NULL, ARG_MONITOR_STREAM},
        {NULL,           0, NULL, 0}
    };

    setlocale(LC_ALL, "");
#ifdef ENABLE_NLS
    bindtextdomain(GETTEXT_PACKAGE, PULSE_LOCALEDIR);
#endif

    bn = pa_path_get_filename(argv[0]);

    if (strstr(bn, "play")) {
        mode = PLAYBACK;
        raw = false;
    } else if (strstr(bn, "record")) {
        mode = RECORD;
        raw = false;
    } else if (strstr(bn, "cat")) {
        mode = PLAYBACK;
        raw = true;
    } else if (strstr(bn, "rec") || strstr(bn, "mon")) {
        mode = RECORD;
        raw = true;
    }

    proplist = pa_proplist_new();

    while ((c = getopt_long(argc, argv, "rpd:s:n:hv", long_options, NULL)) != -1) {

        switch (c) {
            case 'h' :
                help(bn);
                ret = 0;
                goto quit;

            case ARG_VERSION:
                printf(_("pacat %s\n"
                         "Compiled with libpulse %s\n"
                         "Linked with libpulse %s\n"),
                       PACKAGE_VERSION,
                       pa_get_headers_version(),
                       pa_get_library_version());
                ret = 0;
                goto quit;

            case 'r':
                mode = RECORD;
                break;

            case 'p':
                mode = PLAYBACK;
                break;

            case 'd':
                pa_xfree(device);
                device = pa_xstrdup(optarg);
                break;

            case 's':
                pa_xfree(server);
                server = pa_xstrdup(optarg);
                break;
//.........这里部分代码省略.........

static void context_state_cb(pa_context *c, void *userdata) {
    struct userdata *u = userdata;
    pa_assert(u);

    switch (pa_context_get_state(c)) {
        case PA_CONTEXT_UNCONNECTED:
        case PA_CONTEXT_CONNECTING:
        case PA_CONTEXT_AUTHORIZING:
        case PA_CONTEXT_SETTING_NAME:
            break;
        case PA_CONTEXT_READY: {
            pa_proplist *proplist;
            pa_buffer_attr bufferattr;
            pa_usec_t requested_latency;
            char *username = pa_get_user_name_malloc();
            char *hostname = pa_get_host_name_malloc();
            /* TODO: old tunnel put here the remote sink_name into stream name e.g. 'Null Output for [email protected]' */
            char *stream_name = pa_sprintf_malloc(_("Tunnel for %[email protected]%s"), username, hostname);
            pa_xfree(hostname);
            pa_xfree(username);

            pa_log_debug("Connection successful. Creating stream.");
            pa_assert(!u->stream);

            proplist = tunnel_new_proplist(u);
            
            if(u->transcode.encoding != -1) {
            
                  unsigned int n_formats = 1;
                  pa_format_info *formats[1];
  
                  formats[0] = pa_format_info_new();
                  formats[0]->encoding = u->transcode.encoding;
                  pa_format_info_set_sample_format(formats[0], u->sink->sample_spec.format);
                  pa_format_info_set_rate(formats[0], u->sink->sample_spec.rate);
                  pa_format_info_set_channels(formats[0], u->sink->sample_spec.channels);
                  pa_format_info_set_channel_map(formats[0],  &u->sink->channel_map);
                  pa_transcode_set_format_info(&u->transcode, formats[0]);

                  u->stream = pa_stream_new_extended(u->context, stream_name, formats, n_formats, proplist);
                       
            }
            else
                  u->stream = pa_stream_new_with_proplist(u->context,
                                                    stream_name,
                                                    &u->sink->sample_spec,
                                                    &u->sink->channel_map,
                                                    proplist);
            pa_proplist_free(proplist);
            pa_xfree(stream_name);

            if (!u->stream) {
                pa_log_error("Could not create a stream.");
                u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP);
                return;
            }

            requested_latency = pa_sink_get_requested_latency_within_thread(u->sink);
            if (requested_latency == (pa_usec_t) -1)
                requested_latency = u->sink->thread_info.max_latency;

            reset_bufferattr(&bufferattr);
            bufferattr.tlength = pa_usec_to_bytes(requested_latency, &u->sink->sample_spec);

            pa_stream_set_state_callback(u->stream, stream_state_cb, userdata);
            pa_stream_set_buffer_attr_callback(u->stream, stream_changed_buffer_attr_cb, userdata);
            if (pa_stream_connect_playback(u->stream,
                                           u->remote_sink_name,
                                           &bufferattr,
                                           PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_DONT_MOVE | PA_STREAM_START_CORKED | PA_STREAM_AUTO_TIMING_UPDATE,
                                           NULL,
                                           NULL) < 0) {
                pa_log_error("Could not connect stream.");
                u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP);
            }
            u->connected = true;
            break;
        }
        case PA_CONTEXT_FAILED:
            pa_log_debug("Context failed: %s.", pa_strerror(pa_context_errno(u->context)));
            u->connected = false;
            u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP);
            break;
        case PA_CONTEXT_TERMINATED:
            pa_log_debug("Context terminated.");
            u->connected = false;
            u->thread_mainloop_api->quit(u->thread_mainloop_api, TUNNEL_THREAD_FAILED_MAINLOOP);
            break;
    }
}

pa_module* pa_module_load(pa_core *c, const char *name, const char *argument) {
    pa_module *m = NULL;
    pa_bool_t (*load_once)(void);
    const char* (*get_deprecated)(void);
    pa_modinfo *mi;

    pa_assert(c);
    pa_assert(name);

    if (c->disallow_module_loading)
        goto fail;

    m = pa_xnew(pa_module, 1);
    m->name = pa_xstrdup(name);
    m->argument = pa_xstrdup(argument);
    m->load_once = FALSE;
    m->proplist = pa_proplist_new();

    if (!(m->dl = lt_dlopenext(name))) {
        pa_log("Failed to open module \"%s\": %s", name, lt_dlerror());
        goto fail;
    }

    if ((load_once = (pa_bool_t (*)(void)) pa_load_sym(m->dl, name, PA_SYMBOL_LOAD_ONCE))) {

        m->load_once = load_once();

        if (m->load_once) {
            pa_module *i;
            uint32_t idx;
            /* OK, the module only wants to be loaded once, let's make sure it is */

            for (i = pa_idxset_first(c->modules, &idx); i; i = pa_idxset_next(c->modules, &idx)) {
                if (strcmp(name, i->name) == 0) {
                    pa_log("Module \"%s\" should be loaded once at most. Refusing to load.", name);
                    goto fail;
                }
            }
        }
    }

    if ((get_deprecated = (const char* (*) (void)) pa_load_sym(m->dl, name, PA_SYMBOL_GET_DEPRECATE))) {
        const char *t;

        if ((t = get_deprecated()))
            pa_log_warn("%s is deprecated: %s", name, t);
    }

    if (!(m->init = (int (*)(pa_module*_m)) pa_load_sym(m->dl, name, PA_SYMBOL_INIT))) {
        pa_log("Failed to load module \"%s\": symbol \""PA_SYMBOL_INIT"\" not found.", name);
        goto fail;
    }

    m->done = (void (*)(pa_module*_m)) pa_load_sym(m->dl, name, PA_SYMBOL_DONE);
    m->get_n_used = (int (*)(pa_module*_m)) pa_load_sym(m->dl, name, PA_SYMBOL_GET_N_USED);
    m->userdata = NULL;
    m->core = c;
    m->unload_requested = FALSE;

    if (m->init(m) < 0) {
        pa_log_error("Failed to load  module \"%s\" (argument: \"%s\"): initialization failed.", name, argument ? argument : "");
        goto fail;
    }

    pa_assert_se(pa_idxset_put(c->modules, m, &m->index) >= 0);
    pa_assert(m->index != PA_IDXSET_INVALID);

    pa_log_info("Loaded \"%s\" (index: #%u; argument: \"%s\").", m->name, m->index, m->argument ? m->argument : "");

    pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);

    if ((mi = pa_modinfo_get_by_handle(m->dl, name))) {

        if (mi->author && !pa_proplist_contains(m->proplist, PA_PROP_MODULE_AUTHOR))
            pa_proplist_sets(m->proplist, PA_PROP_MODULE_AUTHOR, mi->author);

        if (mi->description && !pa_proplist_contains(m->proplist, PA_PROP_MODULE_DESCRIPTION))
            pa_proplist_sets(m->proplist, PA_PROP_MODULE_DESCRIPTION, mi->description);

        if (mi->version && !pa_proplist_contains(m->proplist, PA_PROP_MODULE_VERSION))
            pa_proplist_sets(m->proplist, PA_PROP_MODULE_VERSION, mi->version);

        pa_modinfo_free(mi);
    }

    return m;

fail:

    if (m) {
        if (m->proplist)
            pa_proplist_free(m->proplist);

        pa_xfree(m->argument);
        pa_xfree(m->name);

        if (m->dl)
            lt_dlclose(m->dl);

        pa_xfree(m);
//.........这里部分代码省略.........

static void verify_access(struct userdata *u, struct device *d) {
    char *cd;
    pa_card *card;
    bool accessible;

    pa_assert(u);
    pa_assert(d);

    cd = pa_sprintf_malloc("/dev/snd/controlC%s", path_get_card_id(d->path));
    accessible = access(cd, R_OK|W_OK) >= 0;
    pa_log_debug("%s is accessible: %s", cd, pa_yes_no(accessible));

    pa_xfree(cd);

    if (d->module == PA_INVALID_INDEX) {

        /* If we are not loaded, try to load */

        if (accessible) {
            pa_module *m;
            bool busy;

            /* Check if any of the PCM devices that belong to this
             * card are currently busy. If they are, don't try to load
             * right now, to make sure the probing phase can
             * successfully complete. When the current user of the
             * device closes it we will get another notification via
             * inotify and can then recheck. */

            busy = is_card_busy(path_get_card_id(d->path));
            pa_log_debug("%s is busy: %s", d->path, pa_yes_no(busy));

            if (!busy) {

                /* So, why do we rate limit here? It's certainly ugly,
                 * but there seems to be no other way. Problem is
                 * this: if we are unable to configure/probe an audio
                 * device after opening it we will close it again and
                 * the module initialization will fail. This will then
                 * cause an inotify event on the device node which
                 * will be forwarded to us. We then try to reopen the
                 * audio device again, practically entering a busy
                 * loop.
                 *
                 * A clean fix would be if we would be able to ignore
                 * our own inotify close events. However, inotify
                 * lacks such functionality. Also, during probing of
                 * the device we cannot really distinguish between
                 * other processes causing EBUSY or ourselves, which
                 * means we have no way to figure out if the probing
                 * during opening was canceled by a "try again"
                 * failure or a "fatal" failure. */

                if (pa_ratelimit_test(&d->ratelimit, PA_LOG_DEBUG)) {
                    pa_log_debug("Loading module-alsa-card with arguments '%s'", d->args);
                    m = pa_module_load(u->core, "module-alsa-card", d->args);

                    if (m) {
                        d->module = m->index;
                        pa_log_info("Card %s (%s) module loaded.", d->path, d->card_name);
                    } else
                        pa_log_info("Card %s (%s) failed to load module.", d->path, d->card_name);
                } else
                    pa_log_warn("Tried to configure %s (%s) more often than %u times in %llus",
                                d->path,
                                d->card_name,
                                d->ratelimit.burst,
                                (long long unsigned) (d->ratelimit.interval / PA_USEC_PER_SEC));
            }
        }

    } else {

        /* If we are already loaded update suspend status with
         * accessible boolean */

        if ((card = pa_namereg_get(u->core, d->card_name, PA_NAMEREG_CARD))) {
            pa_log_debug("%s all sinks and sources of card %s.", accessible ? "Resuming" : "Suspending", d->card_name);
            pa_card_suspend(card, !accessible, PA_SUSPEND_SESSION);
        }
    }
}

pa_reserve_monitor_wrapper* pa_reserve_monitor_wrapper_get(pa_core *c, const char *device_name) {
    pa_reserve_monitor_wrapper *w;
    int k;
    char *t;
#ifdef HAVE_DBUS
    DBusError error;

    dbus_error_init(&error);
#endif

    pa_assert(c);
    pa_assert(device_name);

    t = pa_sprintf_malloc("[email protected]%s", device_name);

    if ((w = pa_shared_get(c, t))) {
        pa_xfree(t);

        pa_assert(PA_REFCNT_VALUE(w) >= 1);
        PA_REFCNT_INC(w);

        return w;
    }

    w = pa_xnew0(pa_reserve_monitor_wrapper, 1);
    PA_REFCNT_INIT(w);
    w->core = c;
    pa_hook_init(&w->hook, w);
    w->shared_name = t;

    pa_assert_se(pa_shared_set(c, w->shared_name, w) >= 0);

#ifdef HAVE_DBUS
    if (!(w->connection = pa_dbus_bus_get(c, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
        pa_log_debug("Unable to contact D-Bus session bus: %s: %s", error.name, error.message);

        /* We don't treat this as error here because we want allow PA
         * to run even when no session bus is available. */
        return w;
    }

    if ((k = rm_watch(
                 &w->monitor,
                 pa_dbus_connection_get(w->connection),
                 device_name,
                 change_cb,
                 NULL)) < 0) {

        pa_log_debug("Failed to create watch on device '%s': %s", device_name, pa_cstrerror(-k));
        goto fail;
    }

    pa_log_debug("Successfully create reservation lock monitor for device '%s'", device_name);

    rm_set_userdata(w->monitor, w);
    return w;

fail:
    dbus_error_free(&error);

    reserve_monitor_wrapper_free(w);

    return NULL;
#else
    return w;
#endif
}

static void time_event_destroy_cb(pa_mainloop_api *a, pa_time_event *e, void *userdata) {
    pa_xfree(userdata);
}

//.........这里部分代码省略.........
    data.namereg_fail = namereg_fail;

    pa_source_new_data_set_sample_spec(&data, &sample_spec);
    pa_source_new_data_set_channel_map(&data, &channel_map);
    pa_source_new_data_set_alternate_sample_rate(&data, alternate_sample_rate);

    if (am)
        pa_droid_add_ports(data.ports, am, card);

    u->source = pa_source_new(m->core, &data, PA_SOURCE_HARDWARE);
    pa_source_new_data_done(&data);

    if (!u->source) {
        pa_log("Failed to create source.");
        goto fail;
    }

    u->source->userdata = u;

    u->source->parent.process_msg = source_process_msg;

    source_set_mute_control(u);

    u->source->set_port = source_set_port_cb;

    pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
    pa_source_set_rtpoll(u->source, u->rtpoll);

    /* Disable rewind for droid source */
    pa_source_set_max_rewind(u->source, 0);

    thread_name = pa_sprintf_malloc("droid-source-%s", module_id);
    if (!(u->thread = pa_thread_new(thread_name, thread_func, u))) {
        pa_log("Failed to create thread.");
        goto fail;
    }
    pa_xfree(thread_name);
    thread_name = NULL;

    pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(u->buffer_size, &sample_spec));
    pa_log_debug("Set fixed latency %" PRIu64 " usec", pa_bytes_to_usec(u->buffer_size, &sample_spec));

    if (u->source->active_port)
        source_set_port_cb(u->source, u->source->active_port);

    pa_source_put(u->source);

    return u->source;

fail:
    pa_xfree(thread_name);

    if (config)
        pa_xfree(config);

    if (u)
        userdata_free(u);

    return NULL;
}

void pa_droid_source_free(pa_source *s) {
    struct userdata *u;

    pa_source_assert_ref(s);
    pa_assert_se(u = s->userdata);

    userdata_free(u);
}

static void userdata_free(struct userdata *u) {

    if (u->source)
        pa_source_unlink(u->source);

    if (u->thread) {
        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
        pa_thread_free(u->thread);
    }

    pa_thread_mq_done(&u->thread_mq);

    if (u->source)
        pa_source_unref(u->source);

    if (u->memchunk.memblock)
        pa_memblock_unref(u->memchunk.memblock);

    if (u->hw_module && u->stream) {
        pa_droid_hw_module_lock(u->hw_module);
        u->hw_module->device->close_input_stream(u->hw_module->device, u->stream);
        pa_droid_hw_module_unlock(u->hw_module);
    }

    // Stand alone source
    if (u->hw_module)
        pa_droid_hw_module_unref(u->hw_module);

    pa_xfree(u);
}

pa_reserve_wrapper* pa_reserve_wrapper_get(pa_core *c, const char *device_name) {
    pa_reserve_wrapper *r;
    int k;
    char *t;
#ifdef HAVE_DBUS
    DBusError error;

    dbus_error_init(&error);
#endif

    pa_assert(c);
    pa_assert(device_name);

    t = pa_sprintf_malloc("[email protected]%s", device_name);

    if ((r = pa_shared_get(c, t))) {
        pa_xfree(t);

        pa_assert(PA_REFCNT_VALUE(r) >= 1);
        PA_REFCNT_INC(r);

        return r;
    }

    r = pa_xnew0(pa_reserve_wrapper, 1);
    PA_REFCNT_INIT(r);
    r->core = c;
    pa_hook_init(&r->hook, r);
    r->shared_name = t;

    pa_assert_se(pa_shared_set(c, r->shared_name, r) >= 0);

#ifdef HAVE_DBUS
    if (!(r->connection = pa_dbus_bus_get(c, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
        pa_log_debug("Unable to contact D-Bus session bus: %s: %s", error.name, error.message);

        /* We don't treat this as error here because we want allow PA
         * to run even when no session bus is available. */
        return r;
    }

    if ((k = rd_acquire(
                 &r->device,
                 pa_dbus_connection_get(r->connection),
                 device_name,
                 _("PulseAudio Sound Server"),
                 0,
                 request_cb,
                 NULL)) < 0) {

        if (k == -EBUSY) {
            pa_log_debug("Device '%s' already locked.", device_name);
            goto fail;
        } else {
            pa_log_debug("Failed to acquire reservation lock on device '%s': %s", device_name, pa_cstrerror(-k));
            return r;
        }
    }

    pa_log_debug("Successfully acquired reservation lock on device '%s'", device_name);

    rd_set_userdata(r->device, r);

    return r;
fail:
    dbus_error_free(&error);

    reserve_wrapper_free(r);

    return NULL;
#else
    return r;
#endif
}

void pa_source_new_data_set_port(pa_source_new_data *data, const char *port) {
    pa_assert(data);

    pa_xfree(data->active_port);
    data->active_port = pa_xstrdup(port);
}

void pa_source_new_data_set_name(pa_source_new_data *data, const char *name) {
    pa_assert(data);

    pa_xfree(data->name);
    data->name = pa_xstrdup(name);
}

/* Called from main context */
pa_source* pa_source_new(
        pa_core *core,
        pa_source_new_data *data,
        pa_source_flags_t flags) {

    pa_source *s;
    const char *name;
    char st[PA_SAMPLE_SPEC_SNPRINT_MAX], cm[PA_CHANNEL_MAP_SNPRINT_MAX];
    char *pt;

    pa_assert(core);
    pa_assert(data);
    pa_assert(data->name);
    pa_assert_ctl_context();

    s = pa_msgobject_new(pa_source);

    if (!(name = pa_namereg_register(core, data->name, PA_NAMEREG_SOURCE, s, data->namereg_fail))) {
        pa_log_debug("Failed to register name %s.", data->name);
        pa_xfree(s);
        return NULL;
    }

    pa_source_new_data_set_name(data, name);

    if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SOURCE_NEW], data) < 0) {
        pa_xfree(s);
        pa_namereg_unregister(core, name);
        return NULL;
    }

    /* FIXME, need to free s here on failure */

    pa_return_null_if_fail(!data->driver || pa_utf8_valid(data->driver));
    pa_return_null_if_fail(data->name && pa_utf8_valid(data->name) && data->name[0]);

    pa_return_null_if_fail(data->sample_spec_is_set && pa_sample_spec_valid(&data->sample_spec));

    if (!data->channel_map_is_set)
        pa_return_null_if_fail(pa_channel_map_init_auto(&data->channel_map, data->sample_spec.channels, PA_CHANNEL_MAP_DEFAULT));

    pa_return_null_if_fail(pa_channel_map_valid(&data->channel_map));
    pa_return_null_if_fail(data->channel_map.channels == data->sample_spec.channels);

    if (!data->volume_is_set)
        pa_cvolume_reset(&data->volume, data->sample_spec.channels);

    pa_return_null_if_fail(pa_cvolume_valid(&data->volume));
    pa_return_null_if_fail(pa_cvolume_compatible(&data->volume, &data->sample_spec));

    if (!data->muted_is_set)
        data->muted = FALSE;

    if (data->card)
        pa_proplist_update(data->proplist, PA_UPDATE_MERGE, data->card->proplist);

    pa_device_init_description(data->proplist);
    pa_device_init_icon(data->proplist, FALSE);
    pa_device_init_intended_roles(data->proplist);

    if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_SOURCE_FIXATE], data) < 0) {
        pa_xfree(s);
        pa_namereg_unregister(core, name);
        return NULL;
    }

    s->parent.parent.free = source_free;
    s->parent.process_msg = pa_source_process_msg;

    s->core = core;
    s->state = PA_SOURCE_INIT;
    s->flags = flags;
    s->priority = 0;
    s->suspend_cause = 0;
    s->name = pa_xstrdup(name);
    s->proplist = pa_proplist_copy(data->proplist);
    s->driver = pa_xstrdup(pa_path_get_filename(data->driver));
    s->module = data->module;
    s->card = data->card;

    s->priority = pa_device_init_priority(s->proplist);

    s->sample_spec = data->sample_spec;
    s->channel_map = data->channel_map;

    s->outputs = pa_idxset_new(NULL, NULL);
    s->n_corked = 0;
    s->monitor_of = NULL;
    s->output_from_master = NULL;

    s->volume = data->volume;
    pa_cvolume_reset(&s->soft_volume, s->sample_spec.channels);
    s->base_volume = PA_VOLUME_NORM;
    s->n_volume_steps = PA_VOLUME_NORM+1;
    s->muted = data->muted;
    s->refresh_volume = s->refresh_muted = FALSE;

    reset_callbacks(s);
    s->userdata = NULL;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    m->userdata = u;
    u->fd = fd;
    u->mixer_fd = -1;
    u->mixer_devmask = 0;
    u->use_getospace = u->use_getispace = true;
    u->use_getodelay = true;
    u->mode = mode;
    u->frame_size = pa_frame_size(&ss);
    u->device_name = pa_xstrdup(dev);
    u->in_nfrags = u->out_nfrags = (uint32_t) (u->nfrags = nfrags);
    u->out_fragment_size = u->in_fragment_size = (uint32_t) (u->frag_size = frag_size);
    u->orig_frag_size = orig_frag_size;
    u->use_mmap = use_mmap;
    u->rtpoll = pa_rtpoll_new();

    if (pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll) < 0) {
        pa_log("pa_thread_mq_init() failed.");
        goto fail;
    }

    u->rtpoll_item = NULL;
    build_pollfd(u);

    if (ioctl(fd, SNDCTL_DSP_GETISPACE, &info) >= 0) {
        pa_log_info("Input -- %u fragments of size %u.", info.fragstotal, info.fragsize);
        u->in_fragment_size = (uint32_t) info.fragsize;
        u->in_nfrags = (uint32_t) info.fragstotal;
        u->use_getispace = true;
    }

    if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) >= 0) {
        pa_log_info("Output -- %u fragments of size %u.", info.fragstotal, info.fragsize);
        u->out_fragment_size = (uint32_t) info.fragsize;
        u->out_nfrags = (uint32_t) info.fragstotal;
        u->use_getospace = true;
    }

    u->in_hwbuf_size = u->in_nfrags * u->in_fragment_size;
    u->out_hwbuf_size = u->out_nfrags * u->out_fragment_size;

    if (mode != O_WRONLY) {
        char *name_buf = NULL;

        if (use_mmap) {
            if ((u->in_mmap = mmap(NULL, u->in_hwbuf_size, PROT_READ, MAP_SHARED, fd, 0)) == MAP_FAILED) {
                pa_log_warn("mmap(PROT_READ) failed, reverting to non-mmap mode: %s", pa_cstrerror(errno));
                use_mmap = u->use_mmap = false;
                u->in_mmap = NULL;
            } else
                pa_log_debug("Successfully mmap()ed input buffer.");
        }

        if ((name = pa_modargs_get_value(ma, "source_name", NULL)))
            namereg_fail = true;
        else {
            name = name_buf = pa_sprintf_malloc("oss_input.%s", pa_path_get_filename(dev));
            namereg_fail = false;
        }

        pa_source_new_data_init(&source_new_data);
        source_new_data.driver = __FILE__;
        source_new_data.module = m;
        pa_source_new_data_set_name(&source_new_data, name);
        source_new_data.namereg_fail = namereg_fail;
        pa_source_new_data_set_sample_spec(&source_new_data, &ss);
        pa_source_new_data_set_channel_map(&source_new_data, &map);
        pa_proplist_sets(source_new_data.proplist, PA_PROP_DEVICE_STRING, dev);
        pa_proplist_sets(source_new_data.proplist, PA_PROP_DEVICE_API, "oss");
        pa_proplist_sets(source_new_data.proplist, PA_PROP_DEVICE_DESCRIPTION, hwdesc[0] ? hwdesc : dev);
        pa_proplist_sets(source_new_data.proplist, PA_PROP_DEVICE_ACCESS_MODE, use_mmap ? "mmap" : "serial");
        pa_proplist_setf(source_new_data.proplist, PA_PROP_DEVICE_BUFFERING_BUFFER_SIZE, "%lu", (unsigned long) (u->in_hwbuf_size));
        pa_proplist_setf(source_new_data.proplist, PA_PROP_DEVICE_BUFFERING_FRAGMENT_SIZE, "%lu", (unsigned long) (u->in_fragment_size));

        if (pa_modargs_get_proplist(ma, "source_properties", source_new_data.proplist, PA_UPDATE_REPLACE) < 0) {
            pa_log("Invalid properties");
            pa_source_new_data_done(&source_new_data);
            pa_xfree(name_buf);
            goto fail;
        }

        u->source = pa_source_new(m->core, &source_new_data, PA_SOURCE_HARDWARE|PA_SOURCE_LATENCY);
        pa_source_new_data_done(&source_new_data);
        pa_xfree(name_buf);

        if (!u->source) {
            pa_log("Failed to create source object");
            goto fail;
        }

        u->source->parent.process_msg = source_process_msg;
        u->source->userdata = u;

        pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
        pa_source_set_rtpoll(u->source, u->rtpoll);
        pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(u->in_hwbuf_size, &u->source->sample_spec));
        u->source->refresh_volume = true;

        if (use_mmap)
            u->in_mmap_memblocks = pa_xnew0(pa_memblock*, u->in_nfrags);
    }