path: root/polyp/protocol-native.c

/* $Id$ */

/***
  This file is part of polypaudio.
 
  polypaudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.
 
  polypaudio 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 General Public License
  along with polypaudio; 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 <string.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>

#include "protocol-native.h"
#include "native-common.h"
#include "packet.h"
#include "client.h"
#include "source-output.h"
#include "sink-input.h"
#include "pstream.h"
#include "tagstruct.h"
#include "pdispatch.h"
#include "pstream-util.h"
#include "authkey.h"
#include "namereg.h"
#include "scache.h"
#include "xmalloc.h"
#include "util.h"
#include "subscribe.h"

struct connection;
struct pa_protocol_native;

struct record_stream {
    struct connection *connection;
    uint32_t index;
    struct pa_source_output *source_output;
    struct pa_memblockq *memblockq;
    size_t fragment_size;
};

struct playback_stream {
    int type;
    struct connection *connection;
    uint32_t index;
    struct pa_sink_input *sink_input;
    struct pa_memblockq *memblockq;
    size_t requested_bytes;
    int drain_request;
    uint32_t drain_tag;
};

struct upload_stream {
    int type;
    struct connection *connection;
    uint32_t index;
    struct pa_memchunk memchunk;
    size_t length;
    char *name;
    struct pa_sample_spec sample_spec;
};

struct output_stream {
    int type;
};

enum {
    UPLOAD_STREAM,
    PLAYBACK_STREAM
};

struct connection {
    int authorized;
    struct pa_protocol_native *protocol;
    struct pa_client *client;
    struct pa_pstream *pstream;
    struct pa_pdispatch *pdispatch;
    struct pa_idxset *record_streams, *output_streams;
    uint32_t rrobin_index;
    struct pa_subscription *subscription;
};

struct pa_protocol_native {
    struct pa_module *module;
    int public;
    struct pa_core *core;
    struct pa_socket_server *server;
    struct pa_idxset *connections;
    uint8_t auth_cookie[PA_NATIVE_COOKIE_LENGTH];
};

static int sink_input_peek_cb(struct pa_sink_input *i, struct pa_memchunk *chunk);
static void sink_input_drop_cb(struct pa_sink_input *i, size_t length);
static void sink_input_kill_cb(struct pa_sink_input *i);
static uint32_t sink_input_get_latency_cb(struct pa_sink_input *i);

static void request_bytes(struct playback_stream*s);

static void source_output_kill_cb(struct pa_source_output *o);
static void source_output_push_cb(struct pa_source_output *o, const struct pa_memchunk *chunk);

static void command_exit(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_create_playback_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_drain_playback_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_create_record_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_delete_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_auth(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_set_name(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_lookup(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_stat(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_get_playback_latency(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_create_upload_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_finish_upload_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_play_sample(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_remove_sample(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_get_info(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_get_info_list(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_get_server_info(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_subscribe(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);
static void command_set_volume(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata);

static const struct pa_pdispatch_command command_table[PA_COMMAND_MAX] = {
    [PA_COMMAND_ERROR] = { NULL },
    [PA_COMMAND_TIMEOUT] = { NULL },
    [PA_COMMAND_REPLY] = { NULL },
    [PA_COMMAND_CREATE_PLAYBACK_STREAM] = { command_create_playback_stream },
    [PA_COMMAND_DELETE_PLAYBACK_STREAM] = { command_delete_stream },
    [PA_COMMAND_DRAIN_PLAYBACK_STREAM] = { command_drain_playback_stream },
    [PA_COMMAND_CREATE_RECORD_STREAM] = { command_create_record_stream },
    [PA_COMMAND_DELETE_RECORD_STREAM] = { command_delete_stream },
    [PA_COMMAND_AUTH] = { command_auth },
    [PA_COMMAND_REQUEST] = { NULL },
    [PA_COMMAND_EXIT] = { command_exit },
    [PA_COMMAND_SET_NAME] = { command_set_name },
    [PA_COMMAND_LOOKUP_SINK] = { command_lookup },
    [PA_COMMAND_LOOKUP_SOURCE] = { command_lookup },
    [PA_COMMAND_STAT] = { command_stat },
    [PA_COMMAND_GET_PLAYBACK_LATENCY] = { command_get_playback_latency },
    [PA_COMMAND_CREATE_UPLOAD_STREAM] = { command_create_upload_stream },
    [PA_COMMAND_DELETE_UPLOAD_STREAM] = { command_delete_stream },
    [PA_COMMAND_FINISH_UPLOAD_STREAM] = { command_finish_upload_stream },
    [PA_COMMAND_PLAY_SAMPLE] = { command_play_sample },
    [PA_COMMAND_REMOVE_SAMPLE] = { command_remove_sample },
    [PA_COMMAND_GET_SINK_INFO] = { command_get_info },
    [PA_COMMAND_GET_SOURCE_INFO] = { command_get_info },
    [PA_COMMAND_GET_CLIENT_INFO] = { command_get_info },
    [PA_COMMAND_GET_MODULE_INFO] = { command_get_info },
    [PA_COMMAND_GET_SINK_INPUT_INFO] = { command_get_info },
    [PA_COMMAND_GET_SOURCE_OUTPUT_INFO] = { command_get_info },
    [PA_COMMAND_GET_SINK_INFO_LIST] = { command_get_info_list },
    [PA_COMMAND_GET_SOURCE_INFO_LIST] = { command_get_info_list },
    [PA_COMMAND_GET_MODULE_INFO_LIST] = { command_get_info_list },
    [PA_COMMAND_GET_CLIENT_INFO_LIST] = { command_get_info_list },
    [PA_COMMAND_GET_SINK_INPUT_INFO_LIST] = { command_get_info_list },
    [PA_COMMAND_GET_SOURCE_OUTPUT_INFO_LIST] = { command_get_info_list },
    [PA_COMMAND_GET_SERVER_INFO] = { command_get_server_info },
    [PA_COMMAND_SUBSCRIBE] = { command_subscribe },
    [PA_COMMAND_SET_SINK_VOLUME] = { command_set_volume },
    [PA_COMMAND_SET_SINK_INPUT_VOLUME] = { command_set_volume },
};

/* structure management */

static struct upload_stream* upload_stream_new(struct connection *c, const struct pa_sample_spec *ss, const char *name, size_t length) {
    struct upload_stream *s;
    assert(c && ss && name && length);
    
    s = pa_xmalloc(sizeof(struct upload_stream));
    s->type = UPLOAD_STREAM;
    s->connection = c;
    s->sample_spec = *ss;
    s->name = pa_xstrdup(name);

    s->memchunk.memblock = NULL;
    s->memchunk.index = 0;
    s->memchunk.length = 0;

    s->length = length;
    
    pa_idxset_put(c->output_streams, s, &s->index);
    return s;
}

static void upload_stream_free(struct upload_stream *o) {
    assert(o && o->connection);

    pa_idxset_remove_by_data(o->connection->output_streams, o, NULL);

    pa_xfree(o->name);
    
    if (o->memchunk.memblock)
        pa_memblock_unref(o->memchunk.memblock);
    
    pa_xfree(o);
}

static struct record_stream* record_stream_new(struct connection *c, struct pa_source *source, const struct pa_sample_spec *ss, const char *name, size_t maxlength, size_t fragment_size) {
    struct record_stream *s;
    struct pa_source_output *source_output;
    size_t base;
    assert(c && source && ss && name && maxlength);

    if (!(source_output = pa_source_output_new(source, name, ss)))
        return NULL;

    s = pa_xmalloc(sizeof(struct record_stream));
    s->connection = c;
    s->source_output = source_output;
    s->source_output->push = source_output_push_cb;
    s->source_output->kill = source_output_kill_cb;
    s->source_output->userdata = s;
    s->source_output->owner = c->protocol->module;
    s->source_output->client = c->client;

    s->memblockq = pa_memblockq_new(maxlength, 0, base = pa_frame_size(ss), 0, 0, c->protocol->core->memblock_stat);
    assert(s->memblockq);

    s->fragment_size = (fragment_size/base)*base;
    if (!s->fragment_size)
        s->fragment_size = base;

    pa_idxset_put(c->record_streams, s, &s->index);
    return s;
}

static void record_stream_free(struct record_stream* r) {
    assert(r && r->connection);

    pa_idxset_remove_by_data(r->connection->record_streams, r, NULL);
    pa_source_output_free(r->source_output);
    pa_memblockq_free(r->memblockq);
    pa_xfree(r);
}

static struct playback_stream* playback_stream_new(struct connection *c, struct pa_sink *sink, const struct pa_sample_spec *ss, const char *name,
                                                   size_t maxlength,
                                                   size_t tlength,
                                                   size_t prebuf,
                                                   size_t minreq) {
    struct playback_stream *s;
    struct pa_sink_input *sink_input;
    assert(c && sink && ss && name && maxlength);

    if (!(sink_input = pa_sink_input_new(sink, name, ss)))
        return NULL;
    
    s = pa_xmalloc(sizeof(struct playback_stream));
    s->type = PLAYBACK_STREAM;
    s->connection = c;
    s->sink_input = sink_input;
    
    s->sink_input->peek = sink_input_peek_cb;
    s->sink_input->drop = sink_input_drop_cb;
    s->sink_input->kill = sink_input_kill_cb;
    s->sink_input->get_latency = sink_input_get_latency_cb;
    s->sink_input->userdata = s;
    s->sink_input->owner = c->protocol->module;
    s->sink_input->client = c->client;
    
    s->memblockq = pa_memblockq_new(maxlength, tlength, pa_frame_size(ss), prebuf, minreq, c->protocol->core->memblock_stat);
    assert(s->memblockq);

    s->requested_bytes = 0;
    s->drain_request = 0;
    
    pa_idxset_put(c->output_streams, s, &s->index);
    return s;
}

static void playback_stream_free(struct playback_stream* p) {
    assert(p && p->connection);

    if (p->drain_request)
        pa_pstream_send_error(p->connection->pstream, p->drain_tag, PA_ERROR_NOENTITY);

    pa_idxset_remove_by_data(p->connection->output_streams, p, NULL);
    pa_sink_input_free(p->sink_input);
    pa_memblockq_free(p->memblockq);
    pa_xfree(p);
}

static void connection_free(struct connection *c) {
    struct record_stream *r;
    struct output_stream *o;
    assert(c && c->protocol);

    pa_idxset_remove_by_data(c->protocol->connections, c, NULL);
    while ((r = pa_idxset_first(c->record_streams, NULL)))
        record_stream_free(r);
    pa_idxset_free(c->record_streams, NULL, NULL);

    while ((o = pa_idxset_first(c->output_streams, NULL)))
        if (o->type == PLAYBACK_STREAM)
            playback_stream_free((struct playback_stream*) o);
        else
            upload_stream_free((struct upload_stream*) o);
    pa_idxset_free(c->output_streams, NULL, NULL);

    pa_pdispatch_unref(c->pdispatch);
    pa_pstream_close(c->pstream);
    pa_pstream_unref(c->pstream);
    pa_client_free(c->client);

    if (c->subscription)
        pa_subscription_free(c->subscription);
    
    pa_xfree(c);
}

static void request_bytes(struct playback_stream *s) {
    struct pa_tagstruct *t;
    size_t l;
    assert(s);

    if (!(l = pa_memblockq_missing(s->memblockq)))
        return;

    if (l <= s->requested_bytes)
        return;

    l -= s->requested_bytes;

    if (l < pa_memblockq_get_minreq(s->memblockq))
        return;
    
    s->requested_bytes += l;

    t = pa_tagstruct_new(NULL, 0);
    assert(t);
    pa_tagstruct_putu32(t, PA_COMMAND_REQUEST);
    pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
    pa_tagstruct_putu32(t, s->index);
    pa_tagstruct_putu32(t, l);
    pa_pstream_send_tagstruct(s->connection->pstream, t);

    /*fprintf(stderr, "Requesting %u bytes\n", l);*/
}

static void send_memblock(struct connection *c) {
    uint32_t start;
    struct record_stream *r;

    start = PA_IDXSET_INVALID;
    for (;;) {
        struct pa_memchunk chunk;
        
        if (!(r = pa_idxset_rrobin(c->record_streams, &c->rrobin_index)))
            return;

        if (start == PA_IDXSET_INVALID)
            start = c->rrobin_index;
        else if (start == c->rrobin_index)
            return;

        if (pa_memblockq_peek(r->memblockq,  &chunk) >= 0) {
            if (chunk.length > r->fragment_size)
                chunk.length = r->fragment_size;

            pa_pstream_send_memblock(c->pstream, r->index, 0, &chunk);
            pa_memblockq_drop(r->memblockq, chunk.length);
            pa_memblock_unref(chunk.memblock);
            
            return;
        }
    }
}

static void send_playback_stream_killed(struct playback_stream *p) {
    struct pa_tagstruct *t;
    assert(p);

    t = pa_tagstruct_new(NULL, 0);
    assert(t);
    pa_tagstruct_putu32(t, PA_COMMAND_PLAYBACK_STREAM_KILLED);
    pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
    pa_tagstruct_putu32(t, p->index);
    pa_pstream_send_tagstruct(p->connection->pstream, t);
}

static void send_record_stream_killed(struct record_stream *r) {
    struct pa_tagstruct *t;
    assert(r);

    t = pa_tagstruct_new(NULL, 0);
    assert(t);
    pa_tagstruct_putu32(t, PA_COMMAND_RECORD_STREAM_KILLED);
    pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
    pa_tagstruct_putu32(t, r->index);
    pa_pstream_send_tagstruct(r->connection->pstream, t);
}


/*** sinkinput callbacks ***/

static int sink_input_peek_cb(struct pa_sink_input *i, struct pa_memchunk *chunk) {
    struct playback_stream *s;
    assert(i && i->userdata && chunk);
    s = i->userdata;

    if (pa_memblockq_peek(s->memblockq, chunk) < 0)
        return -1;

    return 0;
}

static void sink_input_drop_cb(struct pa_sink_input *i, size_t length) {
    struct playback_stream *s;
    assert(i && i->userdata && length);
    s = i->userdata;

    pa_memblockq_drop(s->memblockq, length);
    request_bytes(s);

    if (s->drain_request && !pa_memblockq_is_readable(s->memblockq)) {
        pa_pstream_send_simple_ack(s->connection->pstream, s->drain_tag);
        s->drain_request = 0;
    }
}

static void sink_input_kill_cb(struct pa_sink_input *i) {
    assert(i && i->userdata);
    send_playback_stream_killed((struct playback_stream *) i->userdata);
    playback_stream_free((struct playback_stream *) i->userdata);
}

static uint32_t sink_input_get_latency_cb(struct pa_sink_input *i) {
    struct playback_stream *s;
    assert(i && i->userdata);
    s = i->userdata;

    return pa_bytes_to_usec(pa_memblockq_get_length(s->memblockq), &s->sink_input->sample_spec);
}

/*** source_output callbacks ***/

static void source_output_push_cb(struct pa_source_output *o, const struct pa_memchunk *chunk) {
    struct record_stream *s;
    assert(o && o->userdata && chunk);
    s = o->userdata;
    
    pa_memblockq_push(s->memblockq, chunk, 0);
    if (!pa_pstream_is_pending(s->connection->pstream))
        send_memblock(s->connection);
}

static void source_output_kill_cb(struct pa_source_output *o) {
    assert(o && o->userdata);
    send_record_stream_killed((struct record_stream *) o->userdata);
    record_stream_free((struct record_stream *) o->userdata);
}

/*** pdispatch callbacks ***/

static void protocol_error(struct connection *c) {
    fprintf(stderr, __FILE__": protocol error, kicking client\n");
    connection_free(c);
}

static void command_create_playback_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    struct playback_stream *s;
    size_t maxlength, tlength, prebuf, minreq;
    uint32_t sink_index;
    const char *name, *sink_name;
    struct pa_sample_spec ss;
    struct pa_tagstruct *reply;
    struct pa_sink *sink;
    assert(c && t && c->protocol && c->protocol->core);
    
    if (pa_tagstruct_gets(t, &name) < 0 ||
        pa_tagstruct_get_sample_spec(t, &ss) < 0 ||
        pa_tagstruct_getu32(t, &sink_index) < 0 ||
        pa_tagstruct_gets(t, &sink_name) < 0 ||
        pa_tagstruct_getu32(t, &maxlength) < 0 ||
        pa_tagstruct_getu32(t, &tlength) < 0 ||
        pa_tagstruct_getu32(t, &prebuf) < 0 ||
        pa_tagstruct_getu32(t, &minreq) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (sink_index != (uint32_t) -1)
        sink = pa_idxset_get_by_index(c->protocol->core->sinks, sink_index);
    else
        sink = pa_namereg_get(c->protocol->core, *sink_name ? sink_name : NULL, PA_NAMEREG_SINK, 1);

    if (!sink) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }
    
    if (!(s = playback_stream_new(c, sink, &ss, name, maxlength, tlength, prebuf, minreq))) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
        return;
    }
    
    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);
    pa_tagstruct_putu32(reply, s->index);
    assert(s->sink_input);
    pa_tagstruct_putu32(reply, s->sink_input->index);
    pa_pstream_send_tagstruct(c->pstream, reply);
    request_bytes(s);
}

static void command_delete_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    uint32_t channel;
    assert(c && t);
    
    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (command == PA_COMMAND_DELETE_PLAYBACK_STREAM) {
        struct playback_stream *s;
        if (!(s = pa_idxset_get_by_index(c->output_streams, channel)) || (s->type != PLAYBACK_STREAM)) {
            pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
            return;
        }

        playback_stream_free(s);
    } else if (command == PA_COMMAND_DELETE_RECORD_STREAM) {
        struct record_stream *s;
        if (!(s = pa_idxset_get_by_index(c->record_streams, channel))) {
            pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
            return;
        }

        record_stream_free(s);
    } else {
        struct upload_stream *s;
        assert(command == PA_COMMAND_DELETE_UPLOAD_STREAM);
        if (!(s = pa_idxset_get_by_index(c->output_streams, channel)) || (s->type != UPLOAD_STREAM)) {
            pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
            return;
        }

        upload_stream_free(s);
    }
            
    pa_pstream_send_simple_ack(c->pstream, tag);
}

static void command_create_record_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    struct record_stream *s;
    size_t maxlength, fragment_size;
    uint32_t source_index;
    const char *name, *source_name;
    struct pa_sample_spec ss;
    struct pa_tagstruct *reply;
    struct pa_source *source;
    assert(c && t && c->protocol && c->protocol->core);
    
    if (pa_tagstruct_gets(t, &name) < 0 ||
        pa_tagstruct_get_sample_spec(t, &ss) < 0 ||
        pa_tagstruct_getu32(t, &source_index) < 0 ||
        pa_tagstruct_gets(t, &source_name) < 0 ||
        pa_tagstruct_getu32(t, &maxlength) < 0 ||
        pa_tagstruct_getu32(t, &fragment_size) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (source_index != (uint32_t) -1)
        source = pa_idxset_get_by_index(c->protocol->core->sources, source_index);
    else
        source = pa_namereg_get(c->protocol->core, *source_name ? source_name : NULL, PA_NAMEREG_SOURCE, 1);

    if (!source) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }
    
    if (!(s = record_stream_new(c, source, &ss, name, maxlength, fragment_size))) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
        return;
    }
    
    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);
    pa_tagstruct_putu32(reply, s->index);
    assert(s->source_output);
    pa_tagstruct_putu32(reply, s->source_output->index);
    pa_pstream_send_tagstruct(c->pstream, reply);
}

static void command_exit(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    assert(c && t);
    
    if (!pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }
    
    assert(c->protocol && c->protocol->core && c->protocol->core->mainloop);
    c->protocol->core->mainloop->quit(c->protocol->core->mainloop, 0);
    pa_pstream_send_simple_ack(c->pstream, tag); /* nonsense */
    return;
}

static void command_auth(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    const void*cookie;
    assert(c && t);

    if (pa_tagstruct_get_arbitrary(t, &cookie, PA_NATIVE_COOKIE_LENGTH) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }
        
    if (memcmp(c->protocol->auth_cookie, cookie, PA_NATIVE_COOKIE_LENGTH) != 0) {
        fprintf(stderr, "protocol-native.c: Denied access to client with invalid authorization key.\n");
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    c->authorized = 1;
    pa_pstream_send_simple_ack(c->pstream, tag);
    return;
}

static void command_set_name(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    const char *name;
    assert(c && t);

    if (pa_tagstruct_gets(t, &name) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    pa_client_rename(c->client, name);
    pa_pstream_send_simple_ack(c->pstream, tag);
    return;
}

static void command_lookup(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    const char *name;
    uint32_t index = PA_IDXSET_INVALID;
    assert(c && t);

    if (pa_tagstruct_gets(t, &name) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (command == PA_COMMAND_LOOKUP_SINK) {
        struct pa_sink *sink;
        if ((sink = pa_namereg_get(c->protocol->core, name, PA_NAMEREG_SINK, 1)))
            index = sink->index;
    } else {
        struct pa_source *source;
        assert(command == PA_COMMAND_LOOKUP_SOURCE);
        if ((source = pa_namereg_get(c->protocol->core, name, PA_NAMEREG_SOURCE, 1)))
            index = source->index;
    }

    if (index == PA_IDXSET_INVALID)
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
    else {
        struct pa_tagstruct *reply;
        reply = pa_tagstruct_new(NULL, 0);
        assert(reply);
        pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
        pa_tagstruct_putu32(reply, tag);
        pa_tagstruct_putu32(reply, index);
        pa_pstream_send_tagstruct(c->pstream, reply);
    }
}

static void command_drain_playback_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    uint32_t index;
    struct playback_stream *s;
    assert(c && t);

    if (pa_tagstruct_getu32(t, &index) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (!(s = pa_idxset_get_by_index(c->output_streams, index)) || s->type != PLAYBACK_STREAM) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }

    s->drain_request = 0;

    pa_memblockq_prebuf_disable(s->memblockq);
    
    if (!pa_memblockq_is_readable(s->memblockq))
        pa_pstream_send_simple_ack(c->pstream, tag);
    else {
        s->drain_request = 1;
        s->drain_tag = tag;

        pa_sink_notify(s->sink_input->sink);
    }
} 

static void command_stat(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    assert(c && t);
    struct pa_tagstruct *reply;

    if (!pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);
    pa_tagstruct_putu32(reply, c->protocol->core->memblock_stat->total);
    pa_tagstruct_putu32(reply, c->protocol->core->memblock_stat->total_size);
    pa_tagstruct_putu32(reply, c->protocol->core->memblock_stat->allocated);
    pa_tagstruct_putu32(reply, c->protocol->core->memblock_stat->allocated_size);
    pa_pstream_send_tagstruct(c->pstream, reply);
}

static void command_get_playback_latency(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    assert(c && t);
    struct pa_tagstruct *reply;
    struct playback_stream *s;
    uint32_t index, latency;

    if (pa_tagstruct_getu32(t, &index) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (!(s = pa_idxset_get_by_index(c->output_streams, index)) || s->type != PLAYBACK_STREAM) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }

    latency = pa_sink_input_get_latency(s->sink_input);
    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);
    pa_tagstruct_putu32(reply, latency);
    pa_pstream_send_tagstruct(c->pstream, reply);
}

static void command_create_upload_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    struct upload_stream *s;
    size_t length;
    const char *name;
    struct pa_sample_spec ss;
    struct pa_tagstruct *reply;
    assert(c && t && c->protocol && c->protocol->core);
    
    if (pa_tagstruct_gets(t, &name) < 0 ||
        pa_tagstruct_get_sample_spec(t, &ss) < 0 ||
        pa_tagstruct_getu32(t, &length) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if ((length % pa_frame_size(&ss)) != 0 || length <= 0 || !*name) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
        return;
    }
    
    if (!(s = upload_stream_new(c, &ss, name, length))) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_INVALID);
        return;
    }
    
    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);
    pa_tagstruct_putu32(reply, s->index);
    pa_pstream_send_tagstruct(c->pstream, reply);
    
    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REQUEST);
    pa_tagstruct_putu32(reply, (uint32_t) -1); /* tag */
    pa_tagstruct_putu32(reply, s->index);
    pa_tagstruct_putu32(reply, length);
    pa_pstream_send_tagstruct(c->pstream, reply);
}

static void command_finish_upload_stream(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    uint32_t channel;
    struct upload_stream *s;
    uint32_t index;
    assert(c && t);
    
    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (!(s = pa_idxset_get_by_index(c->output_streams, channel)) || (s->type != UPLOAD_STREAM)) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_EXIST);
        return;
    }

    pa_scache_add_item(c->protocol->core, s->name, &s->sample_spec, &s->memchunk, &index);
    pa_pstream_send_simple_ack(c->pstream, tag);
    upload_stream_free(s);
}

static void command_play_sample(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    uint32_t sink_index, volume;
    struct pa_sink *sink;
    const char *name, *sink_name;
    assert(c && t);

    if (pa_tagstruct_getu32(t, &sink_index) < 0 ||
        pa_tagstruct_gets(t, &sink_name) < 0 ||
        pa_tagstruct_getu32(t, &volume) < 0 ||
        pa_tagstruct_gets(t, &name) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }
    
    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (sink_index != (uint32_t) -1)
        sink = pa_idxset_get_by_index(c->protocol->core->sinks, sink_index);
    else
        sink = pa_namereg_get(c->protocol->core, *sink_name ? sink_name : NULL, PA_NAMEREG_SINK, 1);

    if (!sink) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }

    if (pa_scache_play_item(c->protocol->core, name, sink, volume) < 0) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }

    pa_pstream_send_simple_ack(c->pstream, tag);
}

static void command_remove_sample(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    const char *name;
    assert(c && t);

    if (pa_tagstruct_gets(t, &name) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }

    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (pa_scache_remove_item(c->protocol->core, name) < 0) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }

    pa_pstream_send_simple_ack(c->pstream, tag);
}

static void sink_fill_tagstruct(struct pa_tagstruct *t, struct pa_sink *sink) {
    assert(t && sink);
    pa_tagstruct_putu32(t, sink->index);
    pa_tagstruct_puts(t, sink->name);
    pa_tagstruct_puts(t, sink->description ? sink->description : "");
    pa_tagstruct_put_sample_spec(t, &sink->sample_spec);
    pa_tagstruct_putu32(t, sink->owner ? sink->owner->index : (uint32_t) -1);
    pa_tagstruct_putu32(t, sink->volume);
    pa_tagstruct_putu32(t, sink->monitor_source->index);
    pa_tagstruct_puts(t, sink->monitor_source->name);
    pa_tagstruct_putu32(t, pa_sink_get_latency(sink));
}

static void source_fill_tagstruct(struct pa_tagstruct *t, struct pa_source *source) {
    assert(t && source);
    pa_tagstruct_putu32(t, source->index);
    pa_tagstruct_puts(t, source->name);
    pa_tagstruct_puts(t, source->description ? source->description : "");
    pa_tagstruct_put_sample_spec(t, &source->sample_spec);
    pa_tagstruct_putu32(t, source->owner ? source->owner->index : (uint32_t) -1);
    pa_tagstruct_putu32(t, source->monitor_of ? source->monitor_of->index : (uint32_t) -1);
    pa_tagstruct_puts(t, source->monitor_of ? source->monitor_of->name : "");
}

static void client_fill_tagstruct(struct pa_tagstruct *t, struct pa_client *client) {
    assert(t && client);
    pa_tagstruct_putu32(t, client->index);
    pa_tagstruct_puts(t, client->name);
    pa_tagstruct_puts(t, client->protocol_name);
    pa_tagstruct_putu32(t, client->owner ? client->owner->index : (uint32_t) -1);
}

static void module_fill_tagstruct(struct pa_tagstruct *t, struct pa_module *module) {
    assert(t && module);
    pa_tagstruct_putu32(t, module->index);
    pa_tagstruct_puts(t, module->name);
    pa_tagstruct_puts(t, module->argument ? module->argument : "");
    pa_tagstruct_putu32(t, module->n_used);
    pa_tagstruct_putu32(t, module->auto_unload);
}

static void sink_input_fill_tagstruct(struct pa_tagstruct *t, struct pa_sink_input *s) {
    assert(t && s);
    pa_tagstruct_putu32(t, s->index);
    pa_tagstruct_puts(t, s->name ? s->name : "");
    pa_tagstruct_putu32(t, s->owner ? s->owner->index : (uint32_t) -1);
    pa_tagstruct_putu32(t, s->client ? s->client->index : (uint32_t) -1);
    pa_tagstruct_putu32(t, s->sink->index);
    pa_tagstruct_put_sample_spec(t, &s->sample_spec);
    pa_tagstruct_putu32(t, s->volume);
    pa_tagstruct_putu32(t, pa_sink_input_get_latency(s));
}

static void source_output_fill_tagstruct(struct pa_tagstruct *t, struct pa_source_output *s) {
    assert(t && s);
    pa_tagstruct_putu32(t, s->index);
    pa_tagstruct_puts(t, s->name ? s->name : "");
    pa_tagstruct_putu32(t, s->owner ? s->owner->index : (uint32_t) -1);
    pa_tagstruct_putu32(t, s->client ? s->client->index : (uint32_t) -1);
    pa_tagstruct_putu32(t, s->source->index);
    pa_tagstruct_put_sample_spec(t, &s->sample_spec);
}

static void command_get_info(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    uint32_t index;
    struct pa_sink *sink = NULL;
    struct pa_source *source = NULL;
    struct pa_client *client = NULL;
    struct pa_module *module = NULL;
    struct pa_sink_input *si = NULL;
    struct pa_source_output *so = NULL;
    const char *name;
    struct pa_tagstruct *reply;
    assert(c && t);

    
    if (pa_tagstruct_getu32(t, &index) < 0 ||
        (command != PA_COMMAND_GET_CLIENT_INFO &&
         command != PA_COMMAND_GET_MODULE_INFO &&
         command != PA_COMMAND_GET_SINK_INPUT_INFO &&
         command != PA_COMMAND_GET_SOURCE_OUTPUT_INFO &&
         pa_tagstruct_gets(t, &name) < 0) ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }
    
    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (command == PA_COMMAND_GET_SINK_INFO) {
        if (index != (uint32_t) -1)
            sink = pa_idxset_get_by_index(c->protocol->core->sinks, index);
        else
            sink = pa_namereg_get(c->protocol->core, *name ? name : NULL, PA_NAMEREG_SINK, 1);
    } else if (command == PA_COMMAND_GET_SOURCE_INFO) {
        if (index != (uint32_t) -1)
            source = pa_idxset_get_by_index(c->protocol->core->sources, index);
        else
            source = pa_namereg_get(c->protocol->core, *name ? name : NULL, PA_NAMEREG_SOURCE, 1);
    } else if (command == PA_COMMAND_GET_CLIENT_INFO)
        client = pa_idxset_get_by_index(c->protocol->core->clients, index);
    else if (command == PA_COMMAND_GET_MODULE_INFO) 
        module = pa_idxset_get_by_index(c->protocol->core->modules, index);
    else if (command == PA_COMMAND_GET_SINK_INPUT_INFO)
        si = pa_idxset_get_by_index(c->protocol->core->sink_inputs, index);
    else {
        assert(command == PA_COMMAND_GET_SOURCE_OUTPUT_INFO);
        so = pa_idxset_get_by_index(c->protocol->core->source_outputs, index);
    }
            
    if (!sink && !source && !client && !module && !si && !so) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }

    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag); 
    if (sink)
        sink_fill_tagstruct(reply, sink);
    else if (source)
        source_fill_tagstruct(reply, source);
    else if (client)
        client_fill_tagstruct(reply, client);
    else if (module)
        module_fill_tagstruct(reply, module);
    else if (si)
        sink_input_fill_tagstruct(reply, si);
    else
        source_output_fill_tagstruct(reply, so);
    pa_pstream_send_tagstruct(c->pstream, reply);
}

static void command_get_info_list(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    struct pa_idxset *i;
    uint32_t index;
    void *p;
    struct pa_tagstruct *reply;
    assert(c && t);

    if (!pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }
    
    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);

    if (command == PA_COMMAND_GET_SINK_INFO_LIST)
        i = c->protocol->core->sinks;
    else if (command == PA_COMMAND_GET_SOURCE_INFO_LIST)
        i = c->protocol->core->sources;
    else if (command == PA_COMMAND_GET_CLIENT_INFO_LIST)
        i = c->protocol->core->clients;
    else if (command == PA_COMMAND_GET_MODULE_INFO_LIST)
        i = c->protocol->core->modules;
    else if (command == PA_COMMAND_GET_SINK_INPUT_INFO_LIST)
        i = c->protocol->core->sink_inputs;
    else {
        assert(command == PA_COMMAND_GET_SOURCE_OUTPUT_INFO_LIST);
        i = c->protocol->core->source_outputs;
    }

    for (p = pa_idxset_first(i, &index); p; p = pa_idxset_next(i, &index)) {
        if (command == PA_COMMAND_GET_SINK_INFO_LIST)
            sink_fill_tagstruct(reply, p);
        else if (command == PA_COMMAND_GET_SOURCE_INFO_LIST)
            source_fill_tagstruct(reply, p);
        else if (command == PA_COMMAND_GET_CLIENT_INFO_LIST)
            client_fill_tagstruct(reply, p);
        else if (command == PA_COMMAND_GET_MODULE_INFO_LIST)
            module_fill_tagstruct(reply, p);
        else if (command == PA_COMMAND_GET_SINK_INPUT_INFO_LIST)
            sink_input_fill_tagstruct(reply, p);
        else {
            assert(command == PA_COMMAND_GET_SOURCE_OUTPUT_INFO_LIST);
            source_output_fill_tagstruct(reply, p);
        }
    } 
    
    pa_pstream_send_tagstruct(c->pstream, reply);
}

static void command_get_server_info(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    struct pa_tagstruct *reply;
    char txt[256];
    assert(c && t);

    if (!pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }
    
    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    reply = pa_tagstruct_new(NULL, 0);
    assert(reply);
    pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
    pa_tagstruct_putu32(reply, tag);
    pa_tagstruct_puts(reply, PACKAGE_NAME);
    pa_tagstruct_puts(reply, PACKAGE_VERSION);
    pa_tagstruct_puts(reply, pa_get_user_name(txt, sizeof(txt)));
    pa_tagstruct_puts(reply, pa_get_host_name(txt, sizeof(txt)));
    pa_tagstruct_put_sample_spec(reply, &c->protocol->core->default_sample_spec);
    pa_pstream_send_tagstruct(c->pstream, reply);
}

static void subscription_cb(struct pa_core *core, enum pa_subscription_event_type e, uint32_t index, void *userdata) {
    struct pa_tagstruct *t;
    struct connection *c = userdata;
    assert(c && core);

    t = pa_tagstruct_new(NULL, 0);
    assert(t);
    pa_tagstruct_putu32(t, PA_COMMAND_SUBSCRIBE_EVENT);
    pa_tagstruct_putu32(t, (uint32_t) -1);
    pa_tagstruct_putu32(t, e);
    pa_tagstruct_putu32(t, index);
    pa_pstream_send_tagstruct(c->pstream, t);
}

static void command_subscribe(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    enum pa_subscription_mask m;
    assert(c && t);

    if (pa_tagstruct_getu32(t, &m) < 0 ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }
    
    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (c->subscription)
        pa_subscription_free(c->subscription);

    if (m != 0) {
        c->subscription = pa_subscription_new(c->protocol->core, m, subscription_cb, c);
        assert(c->subscription);
    } else
        c->subscription = NULL;

    pa_pstream_send_simple_ack(c->pstream, tag);
}

static void command_set_volume(struct pa_pdispatch *pd, uint32_t command, uint32_t tag, struct pa_tagstruct *t, void *userdata) {
    struct connection *c = userdata;
    uint32_t index, volume;
    struct pa_sink *sink = NULL;
    struct pa_sink_input *si = NULL;
    const char *name = NULL;
    assert(c && t);

    if (pa_tagstruct_getu32(t, &index) < 0 ||
        (command == PA_COMMAND_SET_SINK_VOLUME && pa_tagstruct_gets(t, &name) < 0) ||
        pa_tagstruct_getu32(t, &volume) ||
        !pa_tagstruct_eof(t)) {
        protocol_error(c);
        return;
    }
    
    if (!c->authorized) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_ACCESS);
        return;
    }

    if (command == PA_COMMAND_SET_SINK_VOLUME) {
        if (index != (uint32_t) -1)
            sink = pa_idxset_get_by_index(c->protocol->core->sinks, index);
        else
            sink = pa_namereg_get(c->protocol->core, *name ? name : NULL, PA_NAMEREG_SINK, 1);
    }  else {
        assert(command == PA_COMMAND_SET_SINK_INPUT_VOLUME);
        si = pa_idxset_get_by_index(c->protocol->core->sink_inputs, index);
    }

    if (!si && !sink) {
        pa_pstream_send_error(c->pstream, tag, PA_ERROR_NOENTITY);
        return;
    }

    if (sink)
        pa_sink_set_volume(sink, volume);
    else if (si)
        pa_sink_input_set_volume(si, volume);

    pa_pstream_send_simple_ack(c->pstream, tag);
}


/*** pstream callbacks ***/

static void pstream_packet_callback(struct pa_pstream *p, struct pa_packet *packet, void *userdata) {
    struct connection *c = userdata;
    assert(p && packet && packet->data && c);

    if (pa_pdispatch_run(c->pdispatch, packet, c) < 0) {
        fprintf(stderr, "protocol-native: invalid packet.\n");
        connection_free(c);
    }
}

static void pstream_memblock_callback(struct pa_pstream *p, uint32_t channel, int32_t delta, const struct pa_memchunk *chunk, void *userdata) {
    struct connection *c = userdata;
    struct output_stream *stream;
    assert(p && chunk && userdata);

    if (!(stream = pa_idxset_get_by_index(c->output_streams, channel))) {
        fprintf(stderr, "protocol-native: client sent block for invalid stream.\n");
        connection_free(c);
        return;
    }

    if (stream->type == PLAYBACK_STREAM) {
        struct playback_stream *p = (struct playback_stream*) stream;
        if (chunk->length >= p->requested_bytes)
            p->requested_bytes = 0;
        else
            p->requested_bytes -= chunk->length;
        
        pa_memblockq_push_align(p->memblockq, chunk, delta);
        assert(p->sink_input);
        pa_sink_notify(p->sink_input->sink);
        /*fprintf(stderr, "Recieved %u bytes.\n", chunk->length);*/
    } else {
        struct upload_stream *u = (struct upload_stream*) stream;
        size_t l;
        assert(u->type == UPLOAD_STREAM);

        if (!u->memchunk.memblock) {
            if (u->length == chunk->length) {
                u->memchunk = *chunk;
                pa_memblock_ref(u->memchunk.memblock);
                u->length = 0;
                fprintf(stderr, "COPY\n");
            } else {
                u->memchunk.memblock = pa_memblock_new(u->length, c->protocol->core->memblock_stat);
                u->memchunk.index = u->memchunk.length = 0;
            }
        }
        
        assert(u->memchunk.memblock);
        
        l = u->length; 
        if (l > chunk->length)
            l = chunk->length;

        if (l > 0) {
            memcpy(u->memchunk.memblock->data + u->memchunk.index + u->memchunk.length, chunk->memblock->data+chunk->index, l);
            u->memchunk.length += l;
            u->length -= l;
        }
    }
}

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

    fprintf(stderr, "protocol-native: connection died.\n");
}


static void pstream_drain_callback(struct pa_pstream *p, void *userdata) {
    struct connection *c = userdata;
    assert(p && c);

    send_memblock(c);
}

/*** client callbacks ***/

static void client_kill_cb(struct pa_client *c) {
    assert(c && c->userdata);
    connection_free(c->userdata);
}

/*** socket server callbacks ***/

static void on_connection(struct pa_socket_server*s, struct pa_iochannel *io, void *userdata) {
    struct pa_protocol_native *p = userdata;
    struct connection *c;
    assert(s && io && p);

    c = pa_xmalloc(sizeof(struct connection));
    c->authorized = p->public;
    c->protocol = p;
    assert(p->core);
    c->client = pa_client_new(p->core, "NATIVE", "Client");
    assert(c->client);
    c->client->kill = client_kill_cb;
    c->client->userdata = c;
    c->client->owner = p->module;
    
    c->pstream = pa_pstream_new(p->core->mainloop, io, p->core->memblock_stat);
    assert(c->pstream);

    pa_pstream_set_recieve_packet_callback(c->pstream, pstream_packet_callback, c);
    pa_pstream_set_recieve_memblock_callback(c->pstream, pstream_memblock_callback, c);
    pa_pstream_set_die_callback(c->pstream, pstream_die_callback, c);
    pa_pstream_set_drain_callback(c->pstream, pstream_drain_callback, c);

    c->pdispatch = pa_pdispatch_new(p->core->mainloop, command_table, PA_COMMAND_MAX);
    assert(c->pdispatch);

    c->record_streams = pa_idxset_new(NULL, NULL);
    c->output_streams = pa_idxset_new(NULL, NULL);
    assert(c->record_streams && c->output_streams);

    c->rrobin_index = PA_IDXSET_INVALID;
    c->subscription = NULL;

    pa_idxset_put(p->connections, c, NULL);
}

/*** module entry points ***/

struct pa_protocol_native* pa_protocol_native_new(struct pa_core *core, struct pa_socket_server *server, struct pa_module *m, struct pa_modargs *ma) {
    struct pa_protocol_native *p;
    uint32_t public;
    assert(core && server && ma);

    if (pa_modargs_get_value_u32(ma, "public", &public) < 0) {
        fprintf(stderr, __FILE__": public= expects numeric argument.\n");
        return NULL;
    }
    
    p = pa_xmalloc(sizeof(struct pa_protocol_native));

    if (pa_authkey_load_from_home(pa_modargs_get_value(ma, "cookie", PA_NATIVE_COOKIE_FILE), p->auth_cookie, sizeof(p->auth_cookie)) < 0) {
        pa_xfree(p);
        return NULL;
    }

    p->module = m;
    p->public = public;
    p->server = server;
    p->core = core;
    p->connections = pa_idxset_new(NULL, NULL);
    assert(p->connections);

    pa_socket_server_set_callback(p->server, on_connection, p);
    
    return p;
}

void pa_protocol_native_free(struct pa_protocol_native *p) {
    struct connection *c;
    assert(p);

    while ((c = pa_idxset_first(p->connections, NULL)))
        connection_free(c);
    pa_idxset_free(p->connections, NULL, NULL);
    pa_socket_server_unref(p->server);
    pa_xfree(p);
}