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module-tunnel.c

/* $Id: module-tunnel.c 1426 2007-02-13 15:35:19Z ossman $ */

/***
  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 <unistd.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>

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

#include <pulsecore/module.h>
#include <pulsecore/core-util.h>
#include <pulsecore/modargs.h>
#include <pulsecore/log.h>
#include <pulsecore/core-subscribe.h>
#include <pulsecore/sink-input.h>
#include <pulsecore/pdispatch.h>
#include <pulsecore/pstream.h>
#include <pulsecore/pstream-util.h>
#include <pulsecore/authkey.h>
#include <pulsecore/socket-client.h>
#include <pulsecore/socket-util.h>
#include <pulsecore/authkey-prop.h>

#ifdef TUNNEL_SINK
#include "module-tunnel-sink-symdef.h"
PA_MODULE_DESCRIPTION("Tunnel module for sinks")
PA_MODULE_USAGE(
        "server=<address> "
        "sink=<remote sink name> "
        "cookie=<filename> "
        "format=<sample format> "
        "channels=<number of channels> "
        "rate=<sample rate> "
        "sink_name=<name for the local sink> "
        "channel_map=<channel map>")
#else
#include "module-tunnel-source-symdef.h"
PA_MODULE_DESCRIPTION("Tunnel module for sources")
PA_MODULE_USAGE(
        "server=<address> "
        "source=<remote source name> "
        "cookie=<filename> "
        "format=<sample format> "
        "channels=<number of channels> "
        "rate=<sample rate> "
        "source_name=<name for the local source> "
        "channel_map=<channel map>")
#endif

PA_MODULE_AUTHOR("Lennart Poettering")
PA_MODULE_VERSION(PACKAGE_VERSION)

#define DEFAULT_TLENGTH (44100*2*2/10)  //(10240*8)
#define DEFAULT_MAXLENGTH ((DEFAULT_TLENGTH*3)/2)
#define DEFAULT_MINREQ 512
#define DEFAULT_PREBUF (DEFAULT_TLENGTH-DEFAULT_MINREQ)
#define DEFAULT_FRAGSIZE 1024

#define DEFAULT_TIMEOUT 5

#define LATENCY_INTERVAL 10

static const char* const valid_modargs[] = {
    "server",
    "cookie",
    "format",
    "channels",
    "rate",
#ifdef TUNNEL_SINK
    "sink_name",
    "sink",
#else
    "source_name",
    "source",
#endif
    "channel_map",
    NULL,
};

static void command_stream_killed(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
static void command_subscribe_event(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);

#ifdef TUNNEL_SINK
static void command_request(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata);
#endif

static const pa_pdispatch_cb_t command_table[PA_COMMAND_MAX] = {
#ifdef TUNNEL_SINK
    [PA_COMMAND_REQUEST] = command_request,
#endif
    [PA_COMMAND_PLAYBACK_STREAM_KILLED] = command_stream_killed,
    [PA_COMMAND_RECORD_STREAM_KILLED] = command_stream_killed,
    [PA_COMMAND_SUBSCRIBE_EVENT] = command_subscribe_event,
};

struct userdata {
    pa_socket_client *client;
    pa_pstream *pstream;
    pa_pdispatch *pdispatch;

    char *server_name;
#ifdef TUNNEL_SINK
    char *sink_name;
    pa_sink *sink;
    uint32_t requested_bytes;
#else
    char *source_name;
    pa_source *source;
#endif

    pa_module *module;
    pa_core *core;

    uint8_t auth_cookie[PA_NATIVE_COOKIE_LENGTH];

    uint32_t version;
    uint32_t ctag;
    uint32_t device_index;
    uint32_t channel;

    pa_usec_t host_latency;

    pa_time_event *time_event;

    int auth_cookie_in_property;
};

static void close_stuff(struct userdata *u) {
    assert(u);

    if (u->pstream) {
        pa_pstream_close(u->pstream);
        pa_pstream_unref(u->pstream);
        u->pstream = NULL;
    }

    if (u->pdispatch) {
        pa_pdispatch_unref(u->pdispatch);
        u->pdispatch = NULL;
    }

    if (u->client) {
        pa_socket_client_unref(u->client);
        u->client = NULL;
    }

#ifdef TUNNEL_SINK
    if (u->sink) {
        pa_sink_disconnect(u->sink);
        pa_sink_unref(u->sink);
        u->sink = NULL;
    }
#else
    if (u->source) {
        pa_source_disconnect(u->source);
        pa_source_unref(u->source);
        u->source = NULL;
    }
#endif

    if (u->time_event) {
        u->core->mainloop->time_free(u->time_event);
        u->time_event = NULL;
    }
}

static void die(struct userdata *u) {
    assert(u);
    close_stuff(u);
    pa_module_unload_request(u->module);
}

static void command_stream_killed(pa_pdispatch *pd, PA_GCC_UNUSED uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    assert(pd && t && u && u->pdispatch == pd);

    pa_log("stream killed");
    die(u);
}

static void request_info(struct userdata *u);

static void command_subscribe_event(pa_pdispatch *pd, PA_GCC_UNUSED uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    pa_subscription_event_type_t e;
    uint32_t idx;

    assert(pd && t && u);
    assert(command == PA_COMMAND_SUBSCRIBE_EVENT);

    if (pa_tagstruct_getu32(t, &e) < 0 ||
        pa_tagstruct_getu32(t, &idx) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log("invalid protocol reply");
        die(u);
        return;
    }

#ifdef TUNNEL_SINK
    if (e != (PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE))
        return;
#else
    if (e != (PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE))
        return;
#endif

    request_info(u);
}

#ifdef TUNNEL_SINK
static void send_prebuf_request(struct userdata *u) {
    pa_tagstruct *t;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_PREBUF_PLAYBACK_STREAM);
    pa_tagstruct_putu32(t, u->ctag++);
    pa_tagstruct_putu32(t, u->channel);
    pa_pstream_send_tagstruct(u->pstream, t);
}

static void send_bytes(struct userdata *u) {
    assert(u);

    if (!u->pstream)
        return;

    while (u->requested_bytes > 0) {
        pa_memchunk chunk;
        if (pa_sink_render(u->sink, u->requested_bytes, &chunk) < 0) {

            if (u->requested_bytes >= DEFAULT_TLENGTH-DEFAULT_PREBUF)
                send_prebuf_request(u);

            return;
        }

        pa_pstream_send_memblock(u->pstream, u->channel, 0, PA_SEEK_RELATIVE, &chunk);
        pa_memblock_unref(chunk.memblock);

/*         pa_log("sent %lu", (unsigned long) chunk.length); */

        if (chunk.length > u->requested_bytes)
            u->requested_bytes = 0;
        else
            u->requested_bytes -= chunk.length;
    }
}

static void command_request(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    uint32_t bytes, channel;
    assert(pd && command == PA_COMMAND_REQUEST && t && u && u->pdispatch == pd);

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        pa_tagstruct_getu32(t, &bytes) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log("invalid protocol reply");
        die(u);
        return;
    }

    if (channel != u->channel) {
        pa_log("recieved data for invalid channel");
        die(u);
        return;
    }

    u->requested_bytes += bytes;
    send_bytes(u);
}

#endif

static void stream_get_latency_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    pa_usec_t sink_usec, source_usec, transport_usec;
    int playing;
    int64_t write_index, read_index;
    struct timeval local, remote, now;
    assert(pd && u);

    if (command != PA_COMMAND_REPLY) {
        if (command == PA_COMMAND_ERROR)
            pa_log("failed to get latency.");
        else
            pa_log("protocol error.");
        die(u);
        return;
    }

    if (pa_tagstruct_get_usec(t, &sink_usec) < 0 ||
        pa_tagstruct_get_usec(t, &source_usec) < 0 ||
        pa_tagstruct_get_boolean(t, &playing) < 0 ||
        pa_tagstruct_get_timeval(t, &local) < 0 ||
        pa_tagstruct_get_timeval(t, &remote) < 0 ||
        pa_tagstruct_gets64(t, &write_index) < 0 ||
        pa_tagstruct_gets64(t, &read_index) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log("invalid reply. (latency)");
        die(u);
        return;
    }

    pa_gettimeofday(&now);

    /* FIXME! This could use some serious love. */

    if (pa_timeval_cmp(&local, &remote) < 0 && pa_timeval_cmp(&remote, &now)) {
        /* local and remote seem to have synchronized clocks */
#ifdef TUNNEL_SINK
        transport_usec = pa_timeval_diff(&remote, &local);
#else
        transport_usec = pa_timeval_diff(&now, &remote);
#endif
    } else
        transport_usec = pa_timeval_diff(&now, &local)/2;

#ifdef TUNNEL_SINK
    u->host_latency = sink_usec + transport_usec;
#else
    u->host_latency = source_usec + transport_usec;
    if (u->host_latency > sink_usec)
        u->host_latency -= sink_usec;
    else
        u->host_latency = 0;
#endif

/*     pa_log("estimated host latency: %0.0f usec", (double) u->host_latency);  */
}

static void request_latency(struct userdata *u) {
    pa_tagstruct *t;
    struct timeval now;
    uint32_t tag;
    assert(u);

    t = pa_tagstruct_new(NULL, 0);
#ifdef TUNNEL_SINK
    pa_tagstruct_putu32(t, PA_COMMAND_GET_PLAYBACK_LATENCY);
#else
    pa_tagstruct_putu32(t, PA_COMMAND_GET_RECORD_LATENCY);
#endif
    pa_tagstruct_putu32(t, tag = u->ctag++);
    pa_tagstruct_putu32(t, u->channel);

    pa_gettimeofday(&now);
    pa_tagstruct_put_timeval(t, &now);

    pa_pstream_send_tagstruct(u->pstream, t);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_latency_callback, u, NULL);
}

static void stream_get_info_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    uint32_t idx, owner_module, monitor_source;
    pa_usec_t latency;
    const char *name, *description, *monitor_source_name, *driver;
    int mute;
    uint32_t flags;
    pa_sample_spec sample_spec;
    pa_channel_map channel_map;
    pa_cvolume volume;
    assert(pd && u);

    if (command != PA_COMMAND_REPLY) {
        if (command == PA_COMMAND_ERROR)
            pa_log("failed to get info.");
        else
            pa_log("protocol error.");
        die(u);
        return;
    }

    if (pa_tagstruct_getu32(t, &idx) < 0 ||
        pa_tagstruct_gets(t, &name) < 0 ||
        pa_tagstruct_gets(t, &description) < 0 ||
        pa_tagstruct_get_sample_spec(t, &sample_spec) < 0 ||
        pa_tagstruct_get_channel_map(t, &channel_map) < 0 ||
        pa_tagstruct_getu32(t, &owner_module) < 0 ||
        pa_tagstruct_get_cvolume(t, &volume) < 0 ||
        pa_tagstruct_get_boolean(t, &mute) < 0 ||
        pa_tagstruct_getu32(t, &monitor_source) < 0 ||
        pa_tagstruct_gets(t, &monitor_source_name) < 0 ||
        pa_tagstruct_get_usec(t, &latency) < 0 ||
        pa_tagstruct_gets(t, &driver) < 0 ||
        pa_tagstruct_getu32(t, &flags) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_log("invalid reply. (get_info)");
        die(u);
        return;
    }

#ifdef TUNNEL_SINK
    assert(u->sink);
    if ((!!mute == !!u->sink->hw_muted) &&
        pa_cvolume_equal(&volume, &u->sink->hw_volume))
        return;
#else
    assert(u->source);
    if ((!!mute == !!u->source->hw_muted) &&
        pa_cvolume_equal(&volume, &u->source->hw_volume))
        return;
#endif

#ifdef TUNNEL_SINK
    memcpy(&u->sink->hw_volume, &volume, sizeof(pa_cvolume));
    u->sink->hw_muted = !!mute;

    pa_subscription_post(u->sink->core,
        PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE,
        u->sink->index);
#else
    memcpy(&u->source->hw_volume, &volume, sizeof(pa_cvolume));
    u->source->hw_muted = !!mute;

    pa_subscription_post(u->source->core,
        PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE,
        u->source->index);
#endif
}

static void request_info(struct userdata *u) {
    pa_tagstruct *t;
    uint32_t tag;
    assert(u);

    t = pa_tagstruct_new(NULL, 0);
#ifdef TUNNEL_SINK
    pa_tagstruct_putu32(t, PA_COMMAND_GET_SINK_INFO);
#else
    pa_tagstruct_putu32(t, PA_COMMAND_GET_SOURCE_INFO);
#endif
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
#ifdef TUNNEL_SINK
    pa_tagstruct_puts(t, u->sink_name);
#else
    pa_tagstruct_puts(t, u->source_name);
#endif

    pa_pstream_send_tagstruct(u->pstream, t);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_info_callback, u, NULL);
}

static void start_subscribe(struct userdata *u) {
    pa_tagstruct *t;
    uint32_t tag;
    assert(u);

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SUBSCRIBE);
    pa_tagstruct_putu32(t, tag = u->ctag++);

#ifdef TUNNEL_SINK
    pa_tagstruct_putu32(t, PA_SUBSCRIPTION_MASK_SINK);
#else
    pa_tagstruct_putu32(t, PA_SUBSCRIPTION_MASK_SOURCE);
#endif

    pa_pstream_send_tagstruct(u->pstream, t);
}

static void timeout_callback(pa_mainloop_api *m, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
    struct userdata *u = userdata;
    struct timeval ntv;
    assert(m && e && u);

    request_latency(u);

    pa_gettimeofday(&ntv);
    ntv.tv_sec += LATENCY_INTERVAL;
    m->time_restart(e, &ntv);
}

static void create_stream_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    struct timeval ntv;
    assert(pd && u && u->pdispatch == pd);

    if (command != PA_COMMAND_REPLY) {
        if (command == PA_COMMAND_ERROR)
            pa_log("failed to create stream.");
        else
            pa_log("protocol error.");
        die(u);
        return;
    }

    if (pa_tagstruct_getu32(t, &u->channel) < 0 ||
        pa_tagstruct_getu32(t, &u->device_index) < 0
#ifdef TUNNEL_SINK
        || pa_tagstruct_getu32(t, &u->requested_bytes) < 0
#endif
        )
        goto parse_error;

    if (u->version >= 9) {
#ifdef TUNNEL_SINK
        uint32_t maxlength, tlength, prebuf, minreq;

        if (pa_tagstruct_getu32(t, &maxlength) < 0 ||
            pa_tagstruct_getu32(t, &tlength) < 0 ||
            pa_tagstruct_getu32(t, &prebuf) < 0 ||
            pa_tagstruct_getu32(t, &minreq) < 0)
            goto parse_error;
#else
        uint32_t maxlength, fragsize;

        if (pa_tagstruct_getu32(t, &maxlength) < 0 ||
            pa_tagstruct_getu32(t, &fragsize) < 0)
            goto parse_error;
#endif
    }

    if (!pa_tagstruct_eof(t))
        goto parse_error;

    start_subscribe(u);
    request_info(u);

    assert(!u->time_event);
    pa_gettimeofday(&ntv);
    ntv.tv_sec += LATENCY_INTERVAL;
    u->time_event = u->core->mainloop->time_new(u->core->mainloop, &ntv, timeout_callback, u);

    request_latency(u);
#ifdef TUNNEL_SINK
    send_bytes(u);
#endif

    return;

parse_error:
    pa_log("invalid reply. (create stream)");
    die(u);
}

static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    struct userdata *u = userdata;
    pa_tagstruct *reply;
    char name[256], un[128], hn[128];
#ifdef TUNNEL_SINK
    pa_cvolume volume;
#endif
    assert(pd && u && u->pdispatch == pd);

    if (command != PA_COMMAND_REPLY ||
        pa_tagstruct_getu32(t, &u->version) < 0 ||
        !pa_tagstruct_eof(t)) {
        if (command == PA_COMMAND_ERROR)
            pa_log("failed to authenticate");
        else
            pa_log("protocol error.");
        die(u);
        return;
    }

    /* Minimum supported protocol version */
    if (u->version < 8) {
        pa_log("incompatible protocol version");
        die(u);
        return;
    }

#ifdef TUNNEL_SINK
    snprintf(name, sizeof(name), "Tunnel from host %s, user %s, sink %s",
             pa_get_host_name(hn, sizeof(hn)),
             pa_get_user_name(un, sizeof(un)),
             u->sink->name);
#else
    snprintf(name, sizeof(name), "Tunnel from host %s, user %s, source %s",
             pa_get_host_name(hn, sizeof(hn)),
             pa_get_user_name(un, sizeof(un)),
             u->source->name);
#endif

    reply = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(reply, PA_COMMAND_SET_CLIENT_NAME);
    pa_tagstruct_putu32(reply, tag = u->ctag++);
    pa_tagstruct_puts(reply, name);
    pa_pstream_send_tagstruct(u->pstream, reply);
    /* We ignore the server's reply here */

    reply = pa_tagstruct_new(NULL, 0);
#ifdef TUNNEL_SINK
    pa_tagstruct_putu32(reply, PA_COMMAND_CREATE_PLAYBACK_STREAM);
    pa_tagstruct_putu32(reply, tag = u->ctag++);
    pa_tagstruct_puts(reply, name);
    pa_tagstruct_put_sample_spec(reply, &u->sink->sample_spec);
    pa_tagstruct_put_channel_map(reply, &u->sink->channel_map);
    pa_tagstruct_putu32(reply, PA_INVALID_INDEX);
    pa_tagstruct_puts(reply, u->sink_name);
    pa_tagstruct_putu32(reply, DEFAULT_MAXLENGTH);
    pa_tagstruct_put_boolean(reply, 0);
    pa_tagstruct_putu32(reply, DEFAULT_TLENGTH);
    pa_tagstruct_putu32(reply, DEFAULT_PREBUF);
    pa_tagstruct_putu32(reply, DEFAULT_MINREQ);
    pa_tagstruct_putu32(reply, 0);
    pa_cvolume_reset(&volume, u->sink->sample_spec.channels);
    pa_tagstruct_put_cvolume(reply, &volume);
#else
    pa_tagstruct_putu32(reply, PA_COMMAND_CREATE_RECORD_STREAM);
    pa_tagstruct_putu32(reply, tag = u->ctag++);
    pa_tagstruct_puts(reply, name);
    pa_tagstruct_put_sample_spec(reply, &u->source->sample_spec);
    pa_tagstruct_put_channel_map(reply, &u->source->channel_map);
    pa_tagstruct_putu32(reply, PA_INVALID_INDEX);
    pa_tagstruct_puts(reply, u->source_name);
    pa_tagstruct_putu32(reply, DEFAULT_MAXLENGTH);
    pa_tagstruct_put_boolean(reply, 0);
    pa_tagstruct_putu32(reply, DEFAULT_FRAGSIZE);
#endif

    pa_pstream_send_tagstruct(u->pstream, reply);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, create_stream_callback, u, NULL);
}

static void pstream_die_callback(pa_pstream *p, void *userdata) {
    struct userdata *u = userdata;
    assert(p && u);

    pa_log("stream died.");
    die(u);
}

static void pstream_packet_callback(pa_pstream *p, pa_packet *packet, const pa_creds *creds, void *userdata) {
    struct userdata *u = userdata;
    assert(p && packet && u);

    if (pa_pdispatch_run(u->pdispatch, packet, creds, u) < 0) {
        pa_log("invalid packet");
        die(u);
    }
}

#ifndef TUNNEL_SINK
static void pstream_memblock_callback(pa_pstream *p, uint32_t channel, PA_GCC_UNUSED int64_t offset, PA_GCC_UNUSED pa_seek_mode_t seek, const pa_memchunk *chunk, void *userdata) {
    struct userdata *u = userdata;
    assert(p && chunk && u);

    if (channel != u->channel) {
        pa_log("recieved memory block on bad channel.");
        die(u);
        return;
    }

    pa_source_post(u->source, chunk);
}
#endif

static void on_connection(pa_socket_client *sc, pa_iochannel *io, void *userdata) {
    struct userdata *u = userdata;
    pa_tagstruct *t;
    uint32_t tag;
    assert(sc && u && u->client == sc);

    pa_socket_client_unref(u->client);
    u->client = NULL;

    if (!io) {
        pa_log("connection failed.");
        pa_module_unload_request(u->module);
        return;
    }

    u->pstream = pa_pstream_new(u->core->mainloop, io, u->core->mempool);
    u->pdispatch = pa_pdispatch_new(u->core->mainloop, command_table, PA_COMMAND_MAX);

    pa_pstream_set_die_callback(u->pstream, pstream_die_callback, u);
    pa_pstream_set_recieve_packet_callback(u->pstream, pstream_packet_callback, u);
#ifndef TUNNEL_SINK
    pa_pstream_set_recieve_memblock_callback(u->pstream, pstream_memblock_callback, u);
#endif

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_AUTH);
    pa_tagstruct_putu32(t, tag = u->ctag++);
    pa_tagstruct_putu32(t, PA_PROTOCOL_VERSION);
    pa_tagstruct_put_arbitrary(t, u->auth_cookie, sizeof(u->auth_cookie));
    pa_pstream_send_tagstruct(u->pstream, t);
    pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, setup_complete_callback, u, NULL);

}

#ifdef TUNNEL_SINK
static void sink_notify(pa_sink*sink) {
    struct userdata *u;
    assert(sink && sink->userdata);
    u = sink->userdata;

    send_bytes(u);
}

static pa_usec_t sink_get_latency(pa_sink *sink) {
    struct userdata *u;
    uint32_t l;
    pa_usec_t usec = 0;
    assert(sink && sink->userdata);
    u = sink->userdata;

    l = DEFAULT_TLENGTH;

    if (l > u->requested_bytes) {
        l -= u->requested_bytes;
        usec += pa_bytes_to_usec(l, &u->sink->sample_spec);
    }

    usec += u->host_latency;

    return usec;
}

static int sink_get_hw_volume(pa_sink *sink) {
    struct userdata *u;
    assert(sink && sink->userdata);
    u = sink->userdata;

    return 0;
}

static int sink_set_hw_volume(pa_sink *sink) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(sink && sink->userdata);
    u = sink->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SINK_VOLUME);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->sink_name);
    pa_tagstruct_put_cvolume(t, &sink->hw_volume);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}

static int sink_get_hw_mute(pa_sink *sink) {
    struct userdata *u;
    assert(sink && sink->userdata);
    u = sink->userdata;

    return 0;
}

static int sink_set_hw_mute(pa_sink *sink) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(sink && sink->userdata);
    u = sink->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SINK_MUTE);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->sink_name);
    pa_tagstruct_put_boolean(t, !!sink->hw_muted);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}

#else
static pa_usec_t source_get_latency(pa_source *source) {
    struct userdata *u;
    assert(source && source->userdata);
    u = source->userdata;

    return u->host_latency;
}

static int source_get_hw_volume(pa_source *source) {
    struct userdata *u;
    assert(source && source->userdata);
    u = source->userdata;

    return 0;
}

static int source_set_hw_volume(pa_source *source) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(source && source->userdata);
    u = source->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SOURCE_VOLUME);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->source_name);
    pa_tagstruct_put_cvolume(t, &source->hw_volume);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}

static int source_get_hw_mute(pa_source *source) {
    struct userdata *u;
    assert(source && source->userdata);
    u = source->userdata;

    return 0;
}

static int source_set_hw_mute(pa_source *source) {
    struct userdata *u;
    pa_tagstruct *t;
    uint32_t tag;
    assert(source && source->userdata);
    u = source->userdata;

    t = pa_tagstruct_new(NULL, 0);
    pa_tagstruct_putu32(t, PA_COMMAND_SET_SOURCE_MUTE);
    pa_tagstruct_putu32(t, tag = u->ctag++);

    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, u->source_name);
    pa_tagstruct_put_boolean(t, !!source->hw_muted);
    pa_pstream_send_tagstruct(u->pstream, t);

    return 0;
}
#endif

static int load_key(struct userdata *u, const char*fn) {
    assert(u);

    u->auth_cookie_in_property = 0;

    if (!fn && pa_authkey_prop_get(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME, u->auth_cookie, sizeof(u->auth_cookie)) >= 0) {
        pa_log_debug("using already loaded auth cookie.");
        pa_authkey_prop_ref(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME);
        u->auth_cookie_in_property = 1;
        return 0;
    }

    if (!fn)
        fn = PA_NATIVE_COOKIE_FILE;

    if (pa_authkey_load_auto(fn, u->auth_cookie, sizeof(u->auth_cookie)) < 0)
        return -1;

    pa_log_debug("loading cookie from disk.");

    if (pa_authkey_prop_put(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME, u->auth_cookie, sizeof(u->auth_cookie)) >= 0)
        u->auth_cookie_in_property = 1;

    return 0;
}

int pa__init(pa_core *c, pa_module*m) {
    pa_modargs *ma = NULL;
    struct userdata *u = NULL;
    pa_sample_spec ss;
    pa_channel_map map;
    char *t, *dn = NULL;

    assert(c && m);

    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log("failed to parse module arguments");
        goto fail;
    }

    u = pa_xmalloc(sizeof(struct userdata));
    m->userdata = u;
    u->module = m;
    u->core = c;
    u->client = NULL;
    u->pdispatch = NULL;
    u->pstream = NULL;
    u->server_name = NULL;
#ifdef TUNNEL_SINK
    u->sink_name = pa_xstrdup(pa_modargs_get_value(ma, "sink", NULL));;
    u->sink = NULL;
    u->requested_bytes = 0;
#else
    u->source_name = pa_xstrdup(pa_modargs_get_value(ma, "source", NULL));;
    u->source = NULL;
#endif
    u->ctag = 1;
    u->device_index = u->channel = PA_INVALID_INDEX;
    u->host_latency = 0;
    u->auth_cookie_in_property = 0;
    u->time_event = NULL;

    if (load_key(u, pa_modargs_get_value(ma, "cookie", NULL)) < 0)
        goto fail;

    if (!(u->server_name = pa_xstrdup(pa_modargs_get_value(ma, "server", NULL)))) {
        pa_log("no server specified.");
        goto fail;
    }

    ss = c->default_sample_spec;
    if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
        pa_log("invalid sample format specification");
        goto fail;
    }

    if (!(u->client = pa_socket_client_new_string(c->mainloop, u->server_name, PA_NATIVE_DEFAULT_PORT))) {
        pa_log("failed to connect to server '%s'", u->server_name);
        goto fail;
    }

    if (!u->client)
        goto fail;

    pa_socket_client_set_callback(u->client, on_connection, u);

#ifdef TUNNEL_SINK

    if (!(dn = pa_xstrdup(pa_modargs_get_value(ma, "sink_name", NULL))))
        dn = pa_sprintf_malloc("tunnel.%s", u->server_name);

    if (!(u->sink = pa_sink_new(c, __FILE__, dn, 0, &ss, &map))) {
        pa_log("failed to create sink.");
        goto fail;
    }

    u->sink->get_latency = sink_get_latency;
    u->sink->get_hw_volume = sink_get_hw_volume;
    u->sink->set_hw_volume = sink_set_hw_volume;
    u->sink->get_hw_mute = sink_get_hw_mute;
    u->sink->set_hw_mute = sink_set_hw_mute;
    u->sink->notify = sink_notify;
    u->sink->userdata = u;
    pa_sink_set_description(u->sink, t = pa_sprintf_malloc("Tunnel to %s%s%s", u->sink_name ? u->sink_name : "", u->sink_name ? " on " : "", u->server_name));
    pa_xfree(t);

    pa_sink_set_owner(u->sink, m);
#else

    if (!(dn = pa_xstrdup(pa_modargs_get_value(ma, "source_name", NULL))))
        dn = pa_sprintf_malloc("tunnel.%s", u->server_name);

    if (!(u->source = pa_source_new(c, __FILE__, dn, 0, &ss, &map))) {
        pa_log("failed to create source.");
        goto fail;
    }

    u->source->get_latency = source_get_latency;
    u->source->get_hw_volume = source_get_hw_volume;
    u->source->set_hw_volume = source_set_hw_volume;
    u->source->get_hw_mute = source_get_hw_mute;
    u->source->set_hw_mute = source_set_hw_mute;
    u->source->userdata = u;

    pa_source_set_description(u->source, t = pa_sprintf_malloc("Tunnel to %s%s%s", u->source_name ? u->source_name : "", u->source_name ? " on " : "", u->server_name));
    pa_xfree(t);

    pa_source_set_owner(u->source, m);
#endif

    pa_xfree(dn);

    u->time_event = NULL;

    pa_modargs_free(ma);

    return 0;

fail:
    pa__done(c, m);

    if (ma)
        pa_modargs_free(ma);

    pa_xfree(dn);

    return  -1;
}

void pa__done(pa_core *c, pa_module*m) {
    struct userdata* u;
    assert(c && m);

    if (!(u = m->userdata))
        return;

    close_stuff(u);

    if (u->auth_cookie_in_property)
        pa_authkey_prop_unref(c, PA_NATIVE_COOKIE_PROPERTY_NAME);

#ifdef TUNNEL_SINK
    pa_xfree(u->sink_name);
#else
    pa_xfree(u->source_name);
#endif
    pa_xfree(u->server_name);

    pa_xfree(u);
}



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