[pulseaudio] / src / pulse / stream.c

/***
  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 2.1 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 <string.h>
#include <stdio.h>
#include <string.h>

#include <pulse/def.h>
#include <pulse/timeval.h>
#include <pulse/rtclock.h>
#include <pulse/xmalloc.h>
#include <pulse/fork-detect.h>

#include <pulsecore/pstream-util.h>
#include <pulsecore/log.h>
#include <pulsecore/hashmap.h>
#include <pulsecore/macro.h>
#include <pulsecore/core-rtclock.h>
#include <pulsecore/core-util.h>

#include "internal.h"
#include "stream.h"

/* #define STREAM_DEBUG */

#define AUTO_TIMING_INTERVAL_START_USEC (10*PA_USEC_PER_MSEC)
#define AUTO_TIMING_INTERVAL_END_USEC (1500*PA_USEC_PER_MSEC)

#define SMOOTHER_ADJUST_TIME (1000*PA_USEC_PER_MSEC)
#define SMOOTHER_HISTORY_TIME (5000*PA_USEC_PER_MSEC)
#define SMOOTHER_MIN_HISTORY (4)

pa_stream *pa_stream_new(pa_context *c, const char *name, const pa_sample_spec *ss, const pa_channel_map *map) {
    return pa_stream_new_with_proplist(c, name, ss, map, NULL);
}

static void reset_callbacks(pa_stream *s) {
    s->read_callback = NULL;
    s->read_userdata = NULL;
    s->write_callback = NULL;
    s->write_userdata = NULL;
    s->state_callback = NULL;
    s->state_userdata = NULL;
    s->overflow_callback = NULL;
    s->overflow_userdata = NULL;
    s->underflow_callback = NULL;
    s->underflow_userdata = NULL;
    s->latency_update_callback = NULL;
    s->latency_update_userdata = NULL;
    s->moved_callback = NULL;
    s->moved_userdata = NULL;
    s->suspended_callback = NULL;
    s->suspended_userdata = NULL;
    s->started_callback = NULL;
    s->started_userdata = NULL;
    s->event_callback = NULL;
    s->event_userdata = NULL;
    s->buffer_attr_callback = NULL;
    s->buffer_attr_userdata = NULL;
}

static pa_stream *pa_stream_new_with_proplist_internal(
        pa_context *c,
        const char *name,
        const pa_sample_spec *ss,
        const pa_channel_map *map,
        pa_format_info * const *formats,
        unsigned int n_formats,
        pa_proplist *p) {

    pa_stream *s;
    unsigned int i;

    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);
    pa_assert((ss == NULL && map == NULL) || (formats == NULL && n_formats == 0));
    pa_assert(n_formats < PA_MAX_FORMATS);

    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(c, name || (p && pa_proplist_contains(p, PA_PROP_MEDIA_NAME)), PA_ERR_INVALID);

    s = pa_xnew(pa_stream, 1);
    PA_REFCNT_INIT(s);
    s->context = c;
    s->mainloop = c->mainloop;

    s->direction = PA_STREAM_NODIRECTION;
    s->state = PA_STREAM_UNCONNECTED;
    s->flags = 0;

    if (ss)
        s->sample_spec = *ss;
    else
        pa_sample_spec_init(&s->sample_spec);

    if (map)
        s->channel_map = *map;
    else
        pa_channel_map_init(&s->channel_map);

    s->n_formats = 0;
    if (formats) {
        s->n_formats = n_formats;
        for (i = 0; i < n_formats; i++)
            s->req_formats[i] = pa_format_info_copy(formats[i]);
    }

    /* We'll get the final negotiated format after connecting */
    s->format = NULL;

    s->direct_on_input = PA_INVALID_INDEX;

    s->proplist = p ? pa_proplist_copy(p) : pa_proplist_new();
    if (name)
        pa_proplist_sets(s->proplist, PA_PROP_MEDIA_NAME, name);

    s->channel = 0;
    s->channel_valid = false;
    s->syncid = c->csyncid++;
    s->stream_index = PA_INVALID_INDEX;

    s->requested_bytes = 0;
    memset(&s->buffer_attr, 0, sizeof(s->buffer_attr));

    /* We initialize the target length here, so that if the user
     * passes no explicit buffering metrics the default is similar to
     * what older PA versions provided. */

    s->buffer_attr.maxlength = (uint32_t) -1;
    if (ss)
        s->buffer_attr.tlength = (uint32_t) pa_usec_to_bytes(250*PA_USEC_PER_MSEC, ss); /* 250ms of buffering */
    else {
        /* FIXME: We assume a worst-case compressed format corresponding to
         * 48000 Hz, 2 ch, S16 PCM, but this can very well be incorrect */
        pa_sample_spec tmp_ss = {
            .format   = PA_SAMPLE_S16NE,
            .rate     = 48000,
            .channels = 2,
        };
        s->buffer_attr.tlength = (uint32_t) pa_usec_to_bytes(250*PA_USEC_PER_MSEC, &tmp_ss); /* 250ms of buffering */
    }
    s->buffer_attr.minreq = (uint32_t) -1;
    s->buffer_attr.prebuf = (uint32_t) -1;
    s->buffer_attr.fragsize = (uint32_t) -1;

    s->device_index = PA_INVALID_INDEX;
    s->device_name = NULL;
    s->suspended = false;
    s->corked = false;

    s->write_memblock = NULL;
    s->write_data = NULL;

    pa_memchunk_reset(&s->peek_memchunk);
    s->peek_data = NULL;
    s->record_memblockq = NULL;

    memset(&s->timing_info, 0, sizeof(s->timing_info));
    s->timing_info_valid = false;

    s->previous_time = 0;
    s->latest_underrun_at_index = -1;

    s->read_index_not_before = 0;
    s->write_index_not_before = 0;
    for (i = 0; i < PA_MAX_WRITE_INDEX_CORRECTIONS; i++)
        s->write_index_corrections[i].valid = 0;
    s->current_write_index_correction = 0;

    s->auto_timing_update_event = NULL;
    s->auto_timing_update_requested = false;
    s->auto_timing_interval_usec = AUTO_TIMING_INTERVAL_START_USEC;

    reset_callbacks(s);

    s->smoother = NULL;

    /* Refcounting is strictly one-way: from the "bigger" to the "smaller" object. */
    PA_LLIST_PREPEND(pa_stream, c->streams, s);
    pa_stream_ref(s);

    return s;
}

pa_stream *pa_stream_new_with_proplist(
        pa_context *c,
        const char *name,
        const pa_sample_spec *ss,
        const pa_channel_map *map,
        pa_proplist *p) {

    pa_channel_map tmap;

    PA_CHECK_VALIDITY_RETURN_NULL(c, ss && pa_sample_spec_valid(ss), PA_ERR_INVALID);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 12 || (ss->format != PA_SAMPLE_S32LE && ss->format != PA_SAMPLE_S32BE), PA_ERR_NOTSUPPORTED);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 15 || (ss->format != PA_SAMPLE_S24LE && ss->format != PA_SAMPLE_S24BE), PA_ERR_NOTSUPPORTED);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 15 || (ss->format != PA_SAMPLE_S24_32LE && ss->format != PA_SAMPLE_S24_32BE), PA_ERR_NOTSUPPORTED);
    PA_CHECK_VALIDITY_RETURN_NULL(c, !map || (pa_channel_map_valid(map) && map->channels == ss->channels), PA_ERR_INVALID);

    if (!map)
        PA_CHECK_VALIDITY_RETURN_NULL(c, map = pa_channel_map_init_auto(&tmap, ss->channels, PA_CHANNEL_MAP_DEFAULT), PA_ERR_INVALID);

    return pa_stream_new_with_proplist_internal(c, name, ss, map, NULL, 0, p);
}

pa_stream *pa_stream_new_extended(
        pa_context *c,
        const char *name,
        pa_format_info * const *formats,
        unsigned int n_formats,
        pa_proplist *p) {

    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 21, PA_ERR_NOTSUPPORTED);

    return pa_stream_new_with_proplist_internal(c, name, NULL, NULL, formats, n_formats, p);
}

static void stream_unlink(pa_stream *s) {
    pa_operation *o, *n;
    pa_assert(s);

    if (!s->context)
        return;

    /* Detach from context */

    /* Unref all operation objects that point to us */
    for (o = s->context->operations; o; o = n) {
        n = o->next;

        if (o->stream == s)
            pa_operation_cancel(o);
    }

    /* Drop all outstanding replies for this stream */
    if (s->context->pdispatch)
        pa_pdispatch_unregister_reply(s->context->pdispatch, s);

    if (s->channel_valid) {
        pa_hashmap_remove((s->direction == PA_STREAM_RECORD) ? s->context->record_streams : s->context->playback_streams, PA_UINT32_TO_PTR(s->channel));
        s->channel = 0;
        s->channel_valid = false;
    }

    PA_LLIST_REMOVE(pa_stream, s->context->streams, s);
    pa_stream_unref(s);

    s->context = NULL;

    if (s->auto_timing_update_event) {
        pa_assert(s->mainloop);
        s->mainloop->time_free(s->auto_timing_update_event);
    }

    reset_callbacks(s);
}

static void stream_free(pa_stream *s) {
    unsigned int i;

    pa_assert(s);

    stream_unlink(s);

    if (s->write_memblock) {
        if (s->write_data)
            pa_memblock_release(s->write_memblock);
        pa_memblock_unref(s->write_memblock);
    }

    if (s->peek_memchunk.memblock) {
        if (s->peek_data)
            pa_memblock_release(s->peek_memchunk.memblock);
        pa_memblock_unref(s->peek_memchunk.memblock);
    }

    if (s->record_memblockq)
        pa_memblockq_free(s->record_memblockq);

    if (s->proplist)
        pa_proplist_free(s->proplist);

    if (s->smoother)
        pa_smoother_free(s->smoother);

    for (i = 0; i < s->n_formats; i++)
        pa_format_info_free(s->req_formats[i]);

    if (s->format)
        pa_format_info_free(s->format);

    pa_xfree(s->device_name);
    pa_xfree(s);
}

void pa_stream_unref(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (PA_REFCNT_DEC(s) <= 0)
        stream_free(s);
}

pa_stream* pa_stream_ref(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_REFCNT_INC(s);
    return s;
}

pa_stream_state_t pa_stream_get_state(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    return s->state;
}

pa_context* pa_stream_get_context(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    return s->context;
}

uint32_t pa_stream_get_index(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_ANY(s->context, !pa_detect_fork(), PA_ERR_FORKED, PA_INVALID_INDEX);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE, PA_INVALID_INDEX);

    return s->stream_index;
}

void pa_stream_set_state(pa_stream *s, pa_stream_state_t st) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (s->state == st)
        return;

    pa_stream_ref(s);

    s->state = st;

    if (s->state_callback)
        s->state_callback(s, s->state_userdata);

    if ((st == PA_STREAM_FAILED || st == PA_STREAM_TERMINATED))
        stream_unlink(s);

    pa_stream_unref(s);
}

static void request_auto_timing_update(pa_stream *s, bool force) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (!(s->flags & PA_STREAM_AUTO_TIMING_UPDATE))
        return;

    if (s->state == PA_STREAM_READY &&
        (force || !s->auto_timing_update_requested)) {
        pa_operation *o;

#ifdef STREAM_DEBUG
        pa_log_debug("Automatically requesting new timing data");
#endif

        if ((o = pa_stream_update_timing_info(s, NULL, NULL))) {
            pa_operation_unref(o);
            s->auto_timing_update_requested = true;
        }
    }

    if (s->auto_timing_update_event) {
        if (s->suspended && !force) {
            pa_assert(s->mainloop);
            s->mainloop->time_free(s->auto_timing_update_event);
            s->auto_timing_update_event = NULL;
        } else {
            if (force)
                s->auto_timing_interval_usec = AUTO_TIMING_INTERVAL_START_USEC;

            pa_context_rttime_restart(s->context, s->auto_timing_update_event, pa_rtclock_now() + s->auto_timing_interval_usec);

            s->auto_timing_interval_usec = PA_MIN(AUTO_TIMING_INTERVAL_END_USEC, s->auto_timing_interval_usec*2);
        }
    }
}

void pa_command_stream_killed(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_context *c = userdata;
    pa_stream *s;
    uint32_t channel;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_PLAYBACK_STREAM_KILLED || command == PA_COMMAND_RECORD_STREAM_KILLED);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(command == PA_COMMAND_PLAYBACK_STREAM_KILLED ? c->playback_streams : c->record_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    pa_context_set_error(c, PA_ERR_KILLED);
    pa_stream_set_state(s, PA_STREAM_FAILED);

finish:
    pa_context_unref(c);
}

static void check_smoother_status(pa_stream *s, bool aposteriori, bool force_start, bool force_stop) {
    pa_usec_t x;

    pa_assert(s);
    pa_assert(!force_start || !force_stop);

    if (!s->smoother)
        return;

    x = pa_rtclock_now();

    if (s->timing_info_valid) {
        if (aposteriori)
            x -= s->timing_info.transport_usec;
        else
            x += s->timing_info.transport_usec;
    }

    if (s->suspended || s->corked || force_stop)
        pa_smoother_pause(s->smoother, x);
    else if (force_start || s->buffer_attr.prebuf == 0) {

        if (!s->timing_info_valid &&
            !aposteriori &&
            !force_start &&
            !force_stop &&
            s->context->version >= 13) {

            /* If the server supports STARTED events we take them as
             * indications when audio really starts/stops playing, if
             * we don't have any timing info yet -- instead of trying
             * to be smart and guessing the server time. Otherwise the
             * unknown transport delay adds too much noise to our time
             * calculations. */

            return;
        }

        pa_smoother_resume(s->smoother, x, true);
    }

    /* Please note that we have no idea if playback actually started
     * if prebuf is non-zero! */
}

static void auto_timing_update_callback(pa_mainloop_api *m, pa_time_event *e, const struct timeval *t, void *userdata);

void pa_command_stream_moved(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_context *c = userdata;
    pa_stream *s;
    uint32_t channel;
    const char *dn;
    bool suspended;
    uint32_t di;
    pa_usec_t usec = 0;
    uint32_t maxlength = 0, fragsize = 0, minreq = 0, tlength = 0, prebuf = 0;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_PLAYBACK_STREAM_MOVED || command == PA_COMMAND_RECORD_STREAM_MOVED);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (c->version < 12) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        pa_tagstruct_getu32(t, &di) < 0 ||
        pa_tagstruct_gets(t, &dn) < 0 ||
        pa_tagstruct_get_boolean(t, &suspended) < 0) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (c->version >= 13) {

        if (command == PA_COMMAND_RECORD_STREAM_MOVED) {
            if (pa_tagstruct_getu32(t, &maxlength) < 0 ||
                pa_tagstruct_getu32(t, &fragsize) < 0 ||
                pa_tagstruct_get_usec(t, &usec) < 0) {
                pa_context_fail(c, PA_ERR_PROTOCOL);
                goto finish;
            }
        } else {
            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 ||
                pa_tagstruct_get_usec(t, &usec) < 0) {
                pa_context_fail(c, PA_ERR_PROTOCOL);
                goto finish;
            }
        }
    }

    if (!pa_tagstruct_eof(t)) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!dn || di == PA_INVALID_INDEX) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(command == PA_COMMAND_PLAYBACK_STREAM_MOVED ? c->playback_streams : c->record_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    if (c->version >= 13) {
        if (s->direction == PA_STREAM_RECORD)
            s->timing_info.configured_source_usec = usec;
        else
            s->timing_info.configured_sink_usec = usec;

        s->buffer_attr.maxlength = maxlength;
        s->buffer_attr.fragsize = fragsize;
        s->buffer_attr.tlength = tlength;
        s->buffer_attr.prebuf = prebuf;
        s->buffer_attr.minreq = minreq;
    }

    pa_xfree(s->device_name);
    s->device_name = pa_xstrdup(dn);
    s->device_index = di;

    s->suspended = suspended;

    if ((s->flags & PA_STREAM_AUTO_TIMING_UPDATE) && !suspended && !s->auto_timing_update_event) {
        s->auto_timing_interval_usec = AUTO_TIMING_INTERVAL_START_USEC;
        s->auto_timing_update_event = pa_context_rttime_new(s->context, pa_rtclock_now() + s->auto_timing_interval_usec, &auto_timing_update_callback, s);
        request_auto_timing_update(s, true);
    }

    check_smoother_status(s, true, false, false);
    request_auto_timing_update(s, true);

    if (s->moved_callback)
        s->moved_callback(s, s->moved_userdata);

finish:
    pa_context_unref(c);
}

void pa_command_stream_buffer_attr(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_context *c = userdata;
    pa_stream *s;
    uint32_t channel;
    pa_usec_t usec = 0;
    uint32_t maxlength = 0, fragsize = 0, minreq = 0, tlength = 0, prebuf = 0;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_PLAYBACK_BUFFER_ATTR_CHANGED || command == PA_COMMAND_RECORD_BUFFER_ATTR_CHANGED);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (c->version < 15) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (pa_tagstruct_getu32(t, &channel) < 0) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (command == PA_COMMAND_RECORD_STREAM_MOVED) {
        if (pa_tagstruct_getu32(t, &maxlength) < 0 ||
            pa_tagstruct_getu32(t, &fragsize) < 0 ||
            pa_tagstruct_get_usec(t, &usec) < 0) {
            pa_context_fail(c, PA_ERR_PROTOCOL);
            goto finish;
        }
    } else {
        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 ||
            pa_tagstruct_get_usec(t, &usec) < 0) {
            pa_context_fail(c, PA_ERR_PROTOCOL);
            goto finish;
        }
    }

    if (!pa_tagstruct_eof(t)) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(command == PA_COMMAND_PLAYBACK_BUFFER_ATTR_CHANGED ? c->playback_streams : c->record_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    if (s->direction == PA_STREAM_RECORD)
        s->timing_info.configured_source_usec = usec;
    else
        s->timing_info.configured_sink_usec = usec;

    s->buffer_attr.maxlength = maxlength;
    s->buffer_attr.fragsize = fragsize;
    s->buffer_attr.tlength = tlength;
    s->buffer_attr.prebuf = prebuf;
    s->buffer_attr.minreq = minreq;

    request_auto_timing_update(s, true);

    if (s->buffer_attr_callback)
        s->buffer_attr_callback(s, s->buffer_attr_userdata);

finish:
    pa_context_unref(c);
}

void pa_command_stream_suspended(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_context *c = userdata;
    pa_stream *s;
    uint32_t channel;
    bool suspended;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_PLAYBACK_STREAM_SUSPENDED || command == PA_COMMAND_RECORD_STREAM_SUSPENDED);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (c->version < 12) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        pa_tagstruct_get_boolean(t, &suspended) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(command == PA_COMMAND_PLAYBACK_STREAM_SUSPENDED ? c->playback_streams : c->record_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    s->suspended = suspended;

    if ((s->flags & PA_STREAM_AUTO_TIMING_UPDATE) && !suspended && !s->auto_timing_update_event) {
        s->auto_timing_interval_usec = AUTO_TIMING_INTERVAL_START_USEC;
        s->auto_timing_update_event = pa_context_rttime_new(s->context, pa_rtclock_now() + s->auto_timing_interval_usec, &auto_timing_update_callback, s);
        request_auto_timing_update(s, true);
    }

    check_smoother_status(s, true, false, false);
    request_auto_timing_update(s, true);

    if (s->suspended_callback)
        s->suspended_callback(s, s->suspended_userdata);

finish:
    pa_context_unref(c);
}

void pa_command_stream_started(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_context *c = userdata;
    pa_stream *s;
    uint32_t channel;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_STARTED);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (c->version < 13) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(c->playback_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    check_smoother_status(s, true, true, false);
    request_auto_timing_update(s, true);

    if (s->started_callback)
        s->started_callback(s, s->started_userdata);

finish:
    pa_context_unref(c);
}

void pa_command_stream_event(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_context *c = userdata;
    pa_stream *s;
    uint32_t channel;
    pa_proplist *pl = NULL;
    const char *event;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_PLAYBACK_STREAM_EVENT || command == PA_COMMAND_RECORD_STREAM_EVENT);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (c->version < 15) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    pl = pa_proplist_new();

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        pa_tagstruct_gets(t, &event) < 0 ||
        pa_tagstruct_get_proplist(t, pl) < 0 ||
        !pa_tagstruct_eof(t) || !event) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(command == PA_COMMAND_PLAYBACK_STREAM_EVENT ? c->playback_streams : c->record_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    if (pa_streq(event, PA_STREAM_EVENT_FORMAT_LOST)) {
        /* Let client know what the running time was when the stream had to be killed  */
        pa_usec_t stream_time;
        if (pa_stream_get_time(s, &stream_time) == 0)
            pa_proplist_setf(pl, "stream-time", "%llu", (unsigned long long) stream_time);
    }

    if (s->event_callback)
        s->event_callback(s, event, pl, s->event_userdata);

finish:
    pa_context_unref(c);

    if (pl)
        pa_proplist_free(pl);
}

void pa_command_request(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_stream *s;
    pa_context *c = userdata;
    uint32_t bytes, channel;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_REQUEST);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (pa_tagstruct_getu32(t, &channel) < 0 ||
        pa_tagstruct_getu32(t, &bytes) < 0 ||
        !pa_tagstruct_eof(t)) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(c->playback_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    s->requested_bytes += bytes;

#ifdef STREAM_DEBUG
    pa_log_debug("got request for %lli, now at %lli", (long long) bytes, (long long) s->requested_bytes);
#endif

    if (s->requested_bytes > 0 && s->write_callback)
        s->write_callback(s, (size_t) s->requested_bytes, s->write_userdata);

finish:
    pa_context_unref(c);
}

int64_t pa_stream_get_underflow_index(pa_stream *p) {
    pa_assert(p);
    return p->latest_underrun_at_index;
}

void pa_command_overflow_or_underflow(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_stream *s;
    pa_context *c = userdata;
    uint32_t channel;
    int64_t offset = -1;

    pa_assert(pd);
    pa_assert(command == PA_COMMAND_OVERFLOW || command == PA_COMMAND_UNDERFLOW);
    pa_assert(t);
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_ref(c);

    if (pa_tagstruct_getu32(t, &channel) < 0) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (c->version >= 23 && command == PA_COMMAND_UNDERFLOW) {
        if (pa_tagstruct_gets64(t, &offset) < 0) {
            pa_context_fail(c, PA_ERR_PROTOCOL);
            goto finish;
        }
    }

    if (!pa_tagstruct_eof(t)) {
        pa_context_fail(c, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (!(s = pa_hashmap_get(c->playback_streams, PA_UINT32_TO_PTR(channel))))
        goto finish;

    if (s->state != PA_STREAM_READY)
        goto finish;

    if (offset != -1)
        s->latest_underrun_at_index = offset;

    if (s->buffer_attr.prebuf > 0)
        check_smoother_status(s, true, false, true);

    request_auto_timing_update(s, true);

    if (command == PA_COMMAND_OVERFLOW) {
        if (s->overflow_callback)
            s->overflow_callback(s, s->overflow_userdata);
    } else if (command == PA_COMMAND_UNDERFLOW) {
        if (s->underflow_callback)
            s->underflow_callback(s, s->underflow_userdata);
    }

finish:
    pa_context_unref(c);
}

static void invalidate_indexes(pa_stream *s, bool r, bool w) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

#ifdef STREAM_DEBUG
    pa_log_debug("invalidate r:%u w:%u tag:%u", r, w, s->context->ctag);
#endif

    if (s->state != PA_STREAM_READY)
        return;

    if (w) {
        s->write_index_not_before = s->context->ctag;

        if (s->timing_info_valid)
            s->timing_info.write_index_corrupt = true;

#ifdef STREAM_DEBUG
        pa_log_debug("write_index invalidated");
#endif
    }

    if (r) {
        s->read_index_not_before = s->context->ctag;

        if (s->timing_info_valid)
            s->timing_info.read_index_corrupt = true;

#ifdef STREAM_DEBUG
        pa_log_debug("read_index invalidated");
#endif
    }

    request_auto_timing_update(s, true);
}

static void auto_timing_update_callback(pa_mainloop_api *m, pa_time_event *e, const struct timeval *t, void *userdata) {
    pa_stream *s = userdata;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    pa_stream_ref(s);
    request_auto_timing_update(s, false);
    pa_stream_unref(s);
}

static void create_stream_complete(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(s->state == PA_STREAM_CREATING);

    pa_stream_set_state(s, PA_STREAM_READY);

    if (s->requested_bytes > 0 && s->write_callback)
        s->write_callback(s, (size_t) s->requested_bytes, s->write_userdata);

    if (s->flags & PA_STREAM_AUTO_TIMING_UPDATE) {
        s->auto_timing_interval_usec = AUTO_TIMING_INTERVAL_START_USEC;
        pa_assert(!s->auto_timing_update_event);
        s->auto_timing_update_event = pa_context_rttime_new(s->context, pa_rtclock_now() + s->auto_timing_interval_usec, &auto_timing_update_callback, s);

        request_auto_timing_update(s, true);
    }

    check_smoother_status(s, true, false, false);
}

static void patch_buffer_attr(pa_stream *s, pa_buffer_attr *attr, pa_stream_flags_t *flags) {
    const char *e;

    pa_assert(s);
    pa_assert(attr);

    if ((e = getenv("PULSE_LATENCY_MSEC"))) {
        uint32_t ms;

        if (pa_atou(e, &ms) < 0 || ms <= 0)
            pa_log_debug("Failed to parse $PULSE_LATENCY_MSEC: %s", e);
        else {
            attr->maxlength = (uint32_t) -1;
            attr->tlength = pa_usec_to_bytes(ms * PA_USEC_PER_MSEC, &s->sample_spec);
            attr->minreq = (uint32_t) -1;
            attr->prebuf = (uint32_t) -1;
            attr->fragsize = attr->tlength;
        }

        if (flags)
            *flags |= PA_STREAM_ADJUST_LATENCY;
    }

    if (s->context->version >= 13)
        return;

    /* Version older than 0.9.10 didn't do server side buffer_attr
     * selection, hence we have to fake it on the client side. */

    /* We choose fairly conservative values here, to not confuse
     * old clients with extremely large playback buffers */

    if (attr->maxlength == (uint32_t) -1)
        attr->maxlength = 4*1024*1024; /* 4MB is the maximum queue length PulseAudio <= 0.9.9 supported. */

    if (attr->tlength == (uint32_t) -1)
        attr->tlength = (uint32_t) pa_usec_to_bytes(250*PA_USEC_PER_MSEC, &s->sample_spec); /* 250ms of buffering */

    if (attr->minreq == (uint32_t) -1)
        attr->minreq = (attr->tlength)/5; /* Ask for more data when there are only 200ms left in the playback buffer */

    if (attr->prebuf == (uint32_t) -1)
        attr->prebuf = attr->tlength; /* Start to play only when the playback is fully filled up once */

    if (attr->fragsize == (uint32_t) -1)
        attr->fragsize = attr->tlength; /* Pass data to the app only when the buffer is filled up once */
}

void pa_create_stream_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_stream *s = userdata;
    uint32_t requested_bytes = 0;

    pa_assert(pd);
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(s->state == PA_STREAM_CREATING);

    pa_stream_ref(s);

    if (command != PA_COMMAND_REPLY) {
        if (pa_context_handle_error(s->context, command, t, false) < 0)
            goto finish;

        pa_stream_set_state(s, PA_STREAM_FAILED);
        goto finish;
    }

    if (pa_tagstruct_getu32(t, &s->channel) < 0 ||
        s->channel == PA_INVALID_INDEX ||
        ((s->direction != PA_STREAM_UPLOAD) && (pa_tagstruct_getu32(t, &s->stream_index) < 0 || s->stream_index == PA_INVALID_INDEX)) ||
        ((s->direction != PA_STREAM_RECORD) && pa_tagstruct_getu32(t, &requested_bytes) < 0)) {
        pa_context_fail(s->context, PA_ERR_PROTOCOL);
        goto finish;
    }

    s->requested_bytes = (int64_t) requested_bytes;

    if (s->context->version >= 9) {
        if (s->direction == PA_STREAM_PLAYBACK) {
            if (pa_tagstruct_getu32(t, &s->buffer_attr.maxlength) < 0 ||
                pa_tagstruct_getu32(t, &s->buffer_attr.tlength) < 0 ||
                pa_tagstruct_getu32(t, &s->buffer_attr.prebuf) < 0 ||
                pa_tagstruct_getu32(t, &s->buffer_attr.minreq) < 0) {
                pa_context_fail(s->context, PA_ERR_PROTOCOL);
                goto finish;
            }
        } else if (s->direction == PA_STREAM_RECORD) {
            if (pa_tagstruct_getu32(t, &s->buffer_attr.maxlength) < 0 ||
                pa_tagstruct_getu32(t, &s->buffer_attr.fragsize) < 0) {
                pa_context_fail(s->context, PA_ERR_PROTOCOL);
                goto finish;
            }
        }
    }

    if (s->context->version >= 12 && s->direction != PA_STREAM_UPLOAD) {
        pa_sample_spec ss;
        pa_channel_map cm;
        const char *dn = NULL;
        bool suspended;

        if (pa_tagstruct_get_sample_spec(t, &ss) < 0 ||
            pa_tagstruct_get_channel_map(t, &cm) < 0 ||
            pa_tagstruct_getu32(t, &s->device_index) < 0 ||
            pa_tagstruct_gets(t, &dn) < 0 ||
            pa_tagstruct_get_boolean(t, &suspended) < 0) {
            pa_context_fail(s->context, PA_ERR_PROTOCOL);
            goto finish;
        }

        if (!dn || s->device_index == PA_INVALID_INDEX ||
            ss.channels != cm.channels ||
            !pa_channel_map_valid(&cm) ||
            !pa_sample_spec_valid(&ss) ||
            (s->n_formats == 0 && (
                (!(s->flags & PA_STREAM_FIX_FORMAT) && ss.format != s->sample_spec.format) ||
                (!(s->flags & PA_STREAM_FIX_RATE) && ss.rate != s->sample_spec.rate) ||
                (!(s->flags & PA_STREAM_FIX_CHANNELS) && !pa_channel_map_equal(&cm, &s->channel_map))))) {
            pa_context_fail(s->context, PA_ERR_PROTOCOL);
            goto finish;
        }

        pa_xfree(s->device_name);
        s->device_name = pa_xstrdup(dn);
        s->suspended = suspended;

        s->channel_map = cm;
        s->sample_spec = ss;
    }

    if (s->context->version >= 13 && s->direction != PA_STREAM_UPLOAD) {
        pa_usec_t usec;

        if (pa_tagstruct_get_usec(t, &usec) < 0) {
            pa_context_fail(s->context, PA_ERR_PROTOCOL);
            goto finish;
        }

        if (s->direction == PA_STREAM_RECORD)
            s->timing_info.configured_source_usec = usec;
        else
            s->timing_info.configured_sink_usec = usec;
    }

    if ((s->context->version >= 21 && s->direction == PA_STREAM_PLAYBACK)
        || s->context->version >= 22) {

        pa_format_info *f = pa_format_info_new();
        pa_tagstruct_get_format_info(t, f);

        if (pa_format_info_valid(f))
            s->format = f;
        else {
            pa_format_info_free(f);
            if (s->n_formats > 0) {
                /* We used the extended API, so we should have got back a proper format */
                pa_context_fail(s->context, PA_ERR_PROTOCOL);
                goto finish;
            }
        }
    }

    if (!pa_tagstruct_eof(t)) {
        pa_context_fail(s->context, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (s->direction == PA_STREAM_RECORD) {
        pa_assert(!s->record_memblockq);

        s->record_memblockq = pa_memblockq_new(
                "client side record memblockq",
                0,
                s->buffer_attr.maxlength,
                0,
                &s->sample_spec,
                1,
                0,
                0,
                NULL);
    }

    s->channel_valid = true;
    pa_hashmap_put((s->direction == PA_STREAM_RECORD) ? s->context->record_streams : s->context->playback_streams, PA_UINT32_TO_PTR(s->channel), s);

    create_stream_complete(s);

finish:
    pa_stream_unref(s);
}

static int create_stream(
        pa_stream_direction_t direction,
        pa_stream *s,
        const char *dev,
        const pa_buffer_attr *attr,
        pa_stream_flags_t flags,
        const pa_cvolume *volume,
        pa_stream *sync_stream) {

    pa_tagstruct *t;
    uint32_t tag;
    bool volume_set = !!volume;
    pa_cvolume cv;
    uint32_t i;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(direction == PA_STREAM_PLAYBACK || direction == PA_STREAM_RECORD);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_UNCONNECTED, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direct_on_input == PA_INVALID_INDEX || direction == PA_STREAM_RECORD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, !(flags & ~(PA_STREAM_START_CORKED|
                                              PA_STREAM_INTERPOLATE_TIMING|
                                              PA_STREAM_NOT_MONOTONIC|
                                              PA_STREAM_AUTO_TIMING_UPDATE|
                                              PA_STREAM_NO_REMAP_CHANNELS|
                                              PA_STREAM_NO_REMIX_CHANNELS|
                                              PA_STREAM_FIX_FORMAT|
                                              PA_STREAM_FIX_RATE|
                                              PA_STREAM_FIX_CHANNELS|
                                              PA_STREAM_DONT_MOVE|
                                              PA_STREAM_VARIABLE_RATE|
                                              PA_STREAM_PEAK_DETECT|
                                              PA_STREAM_START_MUTED|
                                              PA_STREAM_ADJUST_LATENCY|
                                              PA_STREAM_EARLY_REQUESTS|
                                              PA_STREAM_DONT_INHIBIT_AUTO_SUSPEND|
                                              PA_STREAM_START_UNMUTED|
                                              PA_STREAM_FAIL_ON_SUSPEND|
                                              PA_STREAM_RELATIVE_VOLUME|
                                              PA_STREAM_PASSTHROUGH)), PA_ERR_INVALID);

    PA_CHECK_VALIDITY(s->context, s->context->version >= 12 || !(flags & PA_STREAM_VARIABLE_RATE), PA_ERR_NOTSUPPORTED);
    PA_CHECK_VALIDITY(s->context, s->context->version >= 13 || !(flags & PA_STREAM_PEAK_DETECT), PA_ERR_NOTSUPPORTED);
    PA_CHECK_VALIDITY(s->context, s->context->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
    /* Although some of the other flags are not supported on older
     * version, we don't check for them here, because it doesn't hurt
     * when they are passed but actually not supported. This makes
     * client development easier */

    PA_CHECK_VALIDITY(s->context, direction == PA_STREAM_RECORD || !(flags & (PA_STREAM_PEAK_DETECT)), PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context, !volume || s->n_formats || (pa_sample_spec_valid(&s->sample_spec) && volume->channels == s->sample_spec.channels), PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context, !sync_stream || (direction == PA_STREAM_PLAYBACK && sync_stream->direction == PA_STREAM_PLAYBACK), PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context, (flags & (PA_STREAM_ADJUST_LATENCY|PA_STREAM_EARLY_REQUESTS)) != (PA_STREAM_ADJUST_LATENCY|PA_STREAM_EARLY_REQUESTS), PA_ERR_INVALID);

    pa_stream_ref(s);

    s->direction = direction;

    if (sync_stream)
        s->syncid = sync_stream->syncid;

    if (attr)
        s->buffer_attr = *attr;
    patch_buffer_attr(s, &s->buffer_attr, &flags);

    s->flags = flags;
    s->corked = !!(flags & PA_STREAM_START_CORKED);

    if (flags & PA_STREAM_INTERPOLATE_TIMING) {
        pa_usec_t x;

        x = pa_rtclock_now();

        pa_assert(!s->smoother);
        s->smoother = pa_smoother_new(
                SMOOTHER_ADJUST_TIME,
                SMOOTHER_HISTORY_TIME,
                !(flags & PA_STREAM_NOT_MONOTONIC),
                true,
                SMOOTHER_MIN_HISTORY,
                x,
                true);
    }

    if (!dev)
        dev = s->direction == PA_STREAM_PLAYBACK ? s->context->conf->default_sink : s->context->conf->default_source;

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CREATE_PLAYBACK_STREAM : PA_COMMAND_CREATE_RECORD_STREAM),
            &tag);

    if (s->context->version < 13)
        pa_tagstruct_puts(t, pa_proplist_gets(s->proplist, PA_PROP_MEDIA_NAME));

    pa_tagstruct_put(
            t,
            PA_TAG_SAMPLE_SPEC, &s->sample_spec,
            PA_TAG_CHANNEL_MAP, &s->channel_map,
            PA_TAG_U32, PA_INVALID_INDEX,
            PA_TAG_STRING, dev,
            PA_TAG_U32, s->buffer_attr.maxlength,
            PA_TAG_BOOLEAN, s->corked,
            PA_TAG_INVALID);

    if (!volume) {
        if (pa_sample_spec_valid(&s->sample_spec))
            volume = pa_cvolume_reset(&cv, s->sample_spec.channels);
        else {
            /* This is not really relevant, since no volume was set, and
             * the real number of channels is embedded in the format_info
             * structure */
            volume = pa_cvolume_reset(&cv, PA_CHANNELS_MAX);
        }
    }

    if (s->direction == PA_STREAM_PLAYBACK) {
        pa_tagstruct_put(
                t,
                PA_TAG_U32, s->buffer_attr.tlength,
                PA_TAG_U32, s->buffer_attr.prebuf,
                PA_TAG_U32, s->buffer_attr.minreq,
                PA_TAG_U32, s->syncid,
                PA_TAG_INVALID);

        pa_tagstruct_put_cvolume(t, volume);
    } else
        pa_tagstruct_putu32(t, s->buffer_attr.fragsize);

    if (s->context->version >= 12) {
        pa_tagstruct_put(
                t,
                PA_TAG_BOOLEAN, flags & PA_STREAM_NO_REMAP_CHANNELS,
                PA_TAG_BOOLEAN, flags & PA_STREAM_NO_REMIX_CHANNELS,
                PA_TAG_BOOLEAN, flags & PA_STREAM_FIX_FORMAT,
                PA_TAG_BOOLEAN, flags & PA_STREAM_FIX_RATE,
                PA_TAG_BOOLEAN, flags & PA_STREAM_FIX_CHANNELS,
                PA_TAG_BOOLEAN, flags & PA_STREAM_DONT_MOVE,
                PA_TAG_BOOLEAN, flags & PA_STREAM_VARIABLE_RATE,
                PA_TAG_INVALID);
    }

    if (s->context->version >= 13) {

        if (s->direction == PA_STREAM_PLAYBACK)
            pa_tagstruct_put_boolean(t, flags & PA_STREAM_START_MUTED);
        else
            pa_tagstruct_put_boolean(t, flags & PA_STREAM_PEAK_DETECT);

        pa_tagstruct_put(
                t,
                PA_TAG_BOOLEAN, flags & PA_STREAM_ADJUST_LATENCY,
                PA_TAG_PROPLIST, s->proplist,
                PA_TAG_INVALID);

        if (s->direction == PA_STREAM_RECORD)
            pa_tagstruct_putu32(t, s->direct_on_input);
    }

    if (s->context->version >= 14) {

        if (s->direction == PA_STREAM_PLAYBACK)
            pa_tagstruct_put_boolean(t, volume_set);

        pa_tagstruct_put_boolean(t, flags & PA_STREAM_EARLY_REQUESTS);
    }

    if (s->context->version >= 15) {

        if (s->direction == PA_STREAM_PLAYBACK)
            pa_tagstruct_put_boolean(t, flags & (PA_STREAM_START_MUTED|PA_STREAM_START_UNMUTED));

        pa_tagstruct_put_boolean(t, flags & PA_STREAM_DONT_INHIBIT_AUTO_SUSPEND);
        pa_tagstruct_put_boolean(t, flags & PA_STREAM_FAIL_ON_SUSPEND);
    }

    if (s->context->version >= 17 && s->direction == PA_STREAM_PLAYBACK)
        pa_tagstruct_put_boolean(t, flags & PA_STREAM_RELATIVE_VOLUME);

    if (s->context->version >= 18 && s->direction == PA_STREAM_PLAYBACK)
        pa_tagstruct_put_boolean(t, flags & (PA_STREAM_PASSTHROUGH));

    if ((s->context->version >= 21 && s->direction == PA_STREAM_PLAYBACK)
        || s->context->version >= 22) {

        pa_tagstruct_putu8(t, s->n_formats);
        for (i = 0; i < s->n_formats; i++)
            pa_tagstruct_put_format_info(t, s->req_formats[i]);
    }

    if (s->context->version >= 22 && s->direction == PA_STREAM_RECORD) {
        pa_tagstruct_put_cvolume(t, volume);
        pa_tagstruct_put_boolean(t, flags & PA_STREAM_START_MUTED);
        pa_tagstruct_put_boolean(t, volume_set);
        pa_tagstruct_put_boolean(t, flags & (PA_STREAM_START_MUTED|PA_STREAM_START_UNMUTED));
        pa_tagstruct_put_boolean(t, flags & PA_STREAM_RELATIVE_VOLUME);
        pa_tagstruct_put_boolean(t, flags & (PA_STREAM_PASSTHROUGH));
    }

    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_create_stream_callback, s, NULL);

    pa_stream_set_state(s, PA_STREAM_CREATING);

    pa_stream_unref(s);
    return 0;
}

int pa_stream_connect_playback(
        pa_stream *s,
        const char *dev,
        const pa_buffer_attr *attr,
        pa_stream_flags_t flags,
        const pa_cvolume *volume,
        pa_stream *sync_stream) {

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    return create_stream(PA_STREAM_PLAYBACK, s, dev, attr, flags, volume, sync_stream);
}

int pa_stream_connect_record(
        pa_stream *s,
        const char *dev,
        const pa_buffer_attr *attr,
        pa_stream_flags_t flags) {

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    return create_stream(PA_STREAM_RECORD, s, dev, attr, flags, NULL, NULL);
}

int pa_stream_begin_write(
        pa_stream *s,
        void **data,
        size_t *nbytes) {

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_PLAYBACK || s->direction == PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, data, PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context, nbytes && *nbytes != 0, PA_ERR_INVALID);

    if (*nbytes != (size_t) -1) {
        size_t m, fs;

        m = pa_mempool_block_size_max(s->context->mempool);
        fs = pa_frame_size(&s->sample_spec);

        m = (m / fs) * fs;
        if (*nbytes > m)
            *nbytes = m;
    }

    if (!s->write_memblock) {
        s->write_memblock = pa_memblock_new(s->context->mempool, *nbytes);
        s->write_data = pa_memblock_acquire(s->write_memblock);
    }

    *data = s->write_data;
    *nbytes = pa_memblock_get_length(s->write_memblock);

    return 0;
}

int pa_stream_cancel_write(
        pa_stream *s) {

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_PLAYBACK || s->direction == PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->write_memblock, PA_ERR_BADSTATE);

    pa_assert(s->write_data);

    pa_memblock_release(s->write_memblock);
    pa_memblock_unref(s->write_memblock);
    s->write_memblock = NULL;
    s->write_data = NULL;

    return 0;
}

int pa_stream_write(
        pa_stream *s,
        const void *data,
        size_t length,
        pa_free_cb_t free_cb,
        int64_t offset,
        pa_seek_mode_t seek) {

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(data);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_PLAYBACK || s->direction == PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, seek <= PA_SEEK_RELATIVE_END, PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_PLAYBACK || (seek == PA_SEEK_RELATIVE && offset == 0), PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context,
                      !s->write_memblock ||
                      ((data >= s->write_data) &&
                       ((const char*) data + length <= (const char*) s->write_data + pa_memblock_get_length(s->write_memblock))),
                      PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context, !free_cb || !s->write_memblock, PA_ERR_INVALID);

    if (s->write_memblock) {
        pa_memchunk chunk;

        /* pa_stream_write_begin() was called before */

        pa_memblock_release(s->write_memblock);

        chunk.memblock = s->write_memblock;
        chunk.index = (const char *) data - (const char *) s->write_data;
        chunk.length = length;

        s->write_memblock = NULL;
        s->write_data = NULL;

        pa_pstream_send_memblock(s->context->pstream, s->channel, offset, seek, &chunk);
        pa_memblock_unref(chunk.memblock);

    } else {
        pa_seek_mode_t t_seek = seek;
        int64_t t_offset = offset;
        size_t t_length = length;
        const void *t_data = data;

        /* pa_stream_write_begin() was not called before */

        while (t_length > 0) {
            pa_memchunk chunk;

            chunk.index = 0;

            if (free_cb && !pa_pstream_get_shm(s->context->pstream)) {
                chunk.memblock = pa_memblock_new_user(s->context->mempool, (void*) t_data, t_length, free_cb, 1);
                chunk.length = t_length;
            } else {
                void *d;

                chunk.length = PA_MIN(t_length, pa_mempool_block_size_max(s->context->mempool));
                chunk.memblock = pa_memblock_new(s->context->mempool, chunk.length);

                d = pa_memblock_acquire(chunk.memblock);
                memcpy(d, t_data, chunk.length);
                pa_memblock_release(chunk.memblock);
            }

            pa_pstream_send_memblock(s->context->pstream, s->channel, t_offset, t_seek, &chunk);

            t_offset = 0;
            t_seek = PA_SEEK_RELATIVE;

            t_data = (const uint8_t*) t_data + chunk.length;
            t_length -= chunk.length;

            pa_memblock_unref(chunk.memblock);
        }

        if (free_cb && pa_pstream_get_shm(s->context->pstream))
            free_cb((void*) data);
    }

    /* This is obviously wrong since we ignore the seeking index . But
     * that's OK, the server side applies the same error */
    s->requested_bytes -= (seek == PA_SEEK_RELATIVE ? offset : 0) + (int64_t) length;

#ifdef STREAM_DEBUG
    pa_log_debug("wrote %lli, now at %lli", (long long) length, (long long) s->requested_bytes);
#endif

    if (s->direction == PA_STREAM_PLAYBACK) {

        /* Update latency request correction */
        if (s->write_index_corrections[s->current_write_index_correction].valid) {

            if (seek == PA_SEEK_ABSOLUTE) {
                s->write_index_corrections[s->current_write_index_correction].corrupt = false;
                s->write_index_corrections[s->current_write_index_correction].absolute = true;
                s->write_index_corrections[s->current_write_index_correction].value = offset + (int64_t) length;
            } else if (seek == PA_SEEK_RELATIVE) {
                if (!s->write_index_corrections[s->current_write_index_correction].corrupt)
                    s->write_index_corrections[s->current_write_index_correction].value += offset + (int64_t) length;
            } else
                s->write_index_corrections[s->current_write_index_correction].corrupt = true;
        }

        /* Update the write index in the already available latency data */
        if (s->timing_info_valid) {

            if (seek == PA_SEEK_ABSOLUTE) {
                s->timing_info.write_index_corrupt = false;
                s->timing_info.write_index = offset + (int64_t) length;
            } else if (seek == PA_SEEK_RELATIVE) {
                if (!s->timing_info.write_index_corrupt)
                    s->timing_info.write_index += offset + (int64_t) length;
            } else
                s->timing_info.write_index_corrupt = true;
        }

        if (!s->timing_info_valid || s->timing_info.write_index_corrupt)
            request_auto_timing_update(s, true);
    }

    return 0;
}

int pa_stream_peek(pa_stream *s, const void **data, size_t *length) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(data);
    pa_assert(length);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE);

    if (!s->peek_memchunk.memblock) {

        if (pa_memblockq_peek(s->record_memblockq, &s->peek_memchunk) < 0) {
            /* record_memblockq is empty. */
            *data = NULL;
            *length = 0;
            return 0;

        } else if (!s->peek_memchunk.memblock) {
            /* record_memblockq isn't empty, but it doesn't have any data at
             * the current read index. */
            *data = NULL;
            *length = s->peek_memchunk.length;
            return 0;
        }

        s->peek_data = pa_memblock_acquire(s->peek_memchunk.memblock);
    }

    pa_assert(s->peek_data);
    *data = (uint8_t*) s->peek_data + s->peek_memchunk.index;
    *length = s->peek_memchunk.length;
    return 0;
}

int pa_stream_drop(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->peek_memchunk.length > 0, PA_ERR_BADSTATE);

    pa_memblockq_drop(s->record_memblockq, s->peek_memchunk.length);

    /* Fix the simulated local read index */
    if (s->timing_info_valid && !s->timing_info.read_index_corrupt)
        s->timing_info.read_index += (int64_t) s->peek_memchunk.length;

    if (s->peek_memchunk.memblock) {
        pa_assert(s->peek_data);
        s->peek_data = NULL;
        pa_memblock_release(s->peek_memchunk.memblock);
        pa_memblock_unref(s->peek_memchunk.memblock);
    }

    pa_memchunk_reset(&s->peek_memchunk);

    return 0;
}

size_t pa_stream_writable_size(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_ANY(s->context, !pa_detect_fork(), PA_ERR_FORKED, (size_t) -1);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE, (size_t) -1);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->direction != PA_STREAM_RECORD, PA_ERR_BADSTATE, (size_t) -1);

    return s->requested_bytes > 0 ? (size_t) s->requested_bytes : 0;
}

size_t pa_stream_readable_size(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_ANY(s->context, !pa_detect_fork(), PA_ERR_FORKED, (size_t) -1);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE, (size_t) -1);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->direction == PA_STREAM_RECORD, PA_ERR_BADSTATE, (size_t) -1);

    return pa_memblockq_get_length(s->record_memblockq);
}

pa_operation * pa_stream_drain(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;
    pa_tagstruct *t;
    uint32_t tag;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE);

    /* Ask for a timing update before we cork/uncork to get the best
     * accuracy for the transport latency suitable for the
     * check_smoother_status() call in the started callback */
    request_auto_timing_update(s, true);

    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(s->context, PA_COMMAND_DRAIN_PLAYBACK_STREAM, &tag);
    pa_tagstruct_putu32(t, s->channel);
    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    /* This might cause the read index to continue again, hence
     * let's request a timing update */
    request_auto_timing_update(s, true);

    return o;
}

static pa_usec_t calc_time(pa_stream *s, bool ignore_transport) {
    pa_usec_t usec;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(s->state == PA_STREAM_READY);
    pa_assert(s->direction != PA_STREAM_UPLOAD);
    pa_assert(s->timing_info_valid);
    pa_assert(s->direction != PA_STREAM_PLAYBACK || !s->timing_info.read_index_corrupt);
    pa_assert(s->direction != PA_STREAM_RECORD || !s->timing_info.write_index_corrupt);

    if (s->direction == PA_STREAM_PLAYBACK) {
        /* The last byte that was written into the output device
         * had this time value associated */
        usec = pa_bytes_to_usec(s->timing_info.read_index < 0 ? 0 : (uint64_t) s->timing_info.read_index, &s->sample_spec);

        if (!s->corked && !s->suspended) {

            if (!ignore_transport)
                /* Because the latency info took a little time to come
                 * to us, we assume that the real output time is actually
                 * a little ahead */
                usec += s->timing_info.transport_usec;

            /* However, the output device usually maintains a buffer
               too, hence the real sample currently played is a little
               back  */
            if (s->timing_info.sink_usec >= usec)
                usec = 0;
            else
                usec -= s->timing_info.sink_usec;
        }

    } else {
        pa_assert(s->direction == PA_STREAM_RECORD);

        /* The last byte written into the server side queue had
         * this time value associated */
        usec = pa_bytes_to_usec(s->timing_info.write_index < 0 ? 0 : (uint64_t) s->timing_info.write_index, &s->sample_spec);

        if (!s->corked && !s->suspended) {

            if (!ignore_transport)
                /* Add transport latency */
                usec += s->timing_info.transport_usec;

            /* Add latency of data in device buffer */
            usec += s->timing_info.source_usec;

            /* If this is a monitor source, we need to correct the
             * time by the playback device buffer */
            if (s->timing_info.sink_usec >= usec)
                usec = 0;
            else
                usec -= s->timing_info.sink_usec;
        }
    }

    return usec;
}

static void stream_get_timing_info_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_operation *o = userdata;
    struct timeval local, remote, now;
    pa_timing_info *i;
    bool playing = false;
    uint64_t underrun_for = 0, playing_for = 0;

    pa_assert(pd);
    pa_assert(o);
    pa_assert(PA_REFCNT_VALUE(o) >= 1);

    if (!o->context || !o->stream)
        goto finish;

    i = &o->stream->timing_info;

    o->stream->timing_info_valid = false;
    i->write_index_corrupt = true;
    i->read_index_corrupt = true;

    if (command != PA_COMMAND_REPLY) {
        if (pa_context_handle_error(o->context, command, t, false) < 0)
            goto finish;

    } else {

        if (pa_tagstruct_get_usec(t, &i->sink_usec) < 0 ||
            pa_tagstruct_get_usec(t, &i->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, &i->write_index) < 0 ||
            pa_tagstruct_gets64(t, &i->read_index) < 0) {

            pa_context_fail(o->context, PA_ERR_PROTOCOL);
            goto finish;
        }

        if (o->context->version >= 13 &&
            o->stream->direction == PA_STREAM_PLAYBACK)
            if (pa_tagstruct_getu64(t, &underrun_for) < 0 ||
                pa_tagstruct_getu64(t, &playing_for) < 0) {

                pa_context_fail(o->context, PA_ERR_PROTOCOL);
                goto finish;
            }

        if (!pa_tagstruct_eof(t)) {
            pa_context_fail(o->context, PA_ERR_PROTOCOL);
            goto finish;
        }
        o->stream->timing_info_valid = true;
        i->write_index_corrupt = false;
        i->read_index_corrupt = false;

        i->playing = (int) playing;
        i->since_underrun = (int64_t) (playing ? playing_for : underrun_for);

        pa_gettimeofday(&now);

        /* Calculate timestamps */
        if (pa_timeval_cmp(&local, &remote) <= 0 && pa_timeval_cmp(&remote, &now) <= 0) {
            /* local and remote seem to have synchronized clocks */

            if (o->stream->direction == PA_STREAM_PLAYBACK)
                i->transport_usec = pa_timeval_diff(&remote, &local);
            else
                i->transport_usec = pa_timeval_diff(&now, &remote);

            i->synchronized_clocks = true;
            i->timestamp = remote;
        } else {
            /* clocks are not synchronized, let's estimate latency then */
            i->transport_usec = pa_timeval_diff(&now, &local)/2;
            i->synchronized_clocks = false;
            i->timestamp = local;
            pa_timeval_add(&i->timestamp, i->transport_usec);
        }

        /* Invalidate read and write indexes if necessary */
        if (tag < o->stream->read_index_not_before)
            i->read_index_corrupt = true;

        if (tag < o->stream->write_index_not_before)
            i->write_index_corrupt = true;

        if (o->stream->direction == PA_STREAM_PLAYBACK) {
            /* Write index correction */

            int n, j;
            uint32_t ctag = tag;

            /* Go through the saved correction values and add up the
             * total correction.*/
            for (n = 0, j = o->stream->current_write_index_correction+1;
                 n < PA_MAX_WRITE_INDEX_CORRECTIONS;
                 n++, j = (j + 1) % PA_MAX_WRITE_INDEX_CORRECTIONS) {

                /* Step over invalid data or out-of-date data */
                if (!o->stream->write_index_corrections[j].valid ||
                    o->stream->write_index_corrections[j].tag < ctag)
                    continue;

                /* Make sure that everything is in order */
                ctag = o->stream->write_index_corrections[j].tag+1;

                /* Now fix the write index */
                if (o->stream->write_index_corrections[j].corrupt) {
                    /* A corrupting seek was made */
                    i->write_index_corrupt = true;
                } else if (o->stream->write_index_corrections[j].absolute) {
                    /* An absolute seek was made */
                    i->write_index = o->stream->write_index_corrections[j].value;
                    i->write_index_corrupt = false;
                } else if (!i->write_index_corrupt) {
                    /* A relative seek was made */
                    i->write_index += o->stream->write_index_corrections[j].value;
                }
            }

            /* Clear old correction entries */
            for (n = 0; n < PA_MAX_WRITE_INDEX_CORRECTIONS; n++) {
                if (!o->stream->write_index_corrections[n].valid)
                    continue;

                if (o->stream->write_index_corrections[n].tag <= tag)
                    o->stream->write_index_corrections[n].valid = false;
            }
        }

        if (o->stream->direction == PA_STREAM_RECORD) {
            /* Read index correction */

            if (!i->read_index_corrupt)
                i->read_index -= (int64_t) pa_memblockq_get_length(o->stream->record_memblockq);
        }

        /* Update smoother if we're not corked */
        if (o->stream->smoother && !o->stream->corked) {
            pa_usec_t u, x;

            u = x = pa_rtclock_now() - i->transport_usec;

            if (o->stream->direction == PA_STREAM_PLAYBACK && o->context->version >= 13) {
                pa_usec_t su;

                /* If we weren't playing then it will take some time
                 * until the audio will actually come out through the
                 * speakers. Since we follow that timing here, we need
                 * to try to fix this up */

                su = pa_bytes_to_usec((uint64_t) i->since_underrun, &o->stream->sample_spec);

                if (su < i->sink_usec)
                    x += i->sink_usec - su;
            }

            if (!i->playing)
                pa_smoother_pause(o->stream->smoother, x);

            /* Update the smoother */
            if ((o->stream->direction == PA_STREAM_PLAYBACK && !i->read_index_corrupt) ||
                (o->stream->direction == PA_STREAM_RECORD && !i->write_index_corrupt))
                pa_smoother_put(o->stream->smoother, u, calc_time(o->stream, true));

            if (i->playing)
                pa_smoother_resume(o->stream->smoother, x, true);
        }
    }

    o->stream->auto_timing_update_requested = false;

    if (o->stream->latency_update_callback)
        o->stream->latency_update_callback(o->stream, o->stream->latency_update_userdata);

    if (o->callback && o->stream && o->stream->state == PA_STREAM_READY) {
        pa_stream_success_cb_t cb = (pa_stream_success_cb_t) o->callback;
        cb(o->stream, o->stream->timing_info_valid, o->userdata);
    }

finish:

    pa_operation_done(o);
    pa_operation_unref(o);
}

pa_operation* pa_stream_update_timing_info(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
    uint32_t tag;
    pa_operation *o;
    pa_tagstruct *t;
    struct timeval now;
    int cidx = 0;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);

    if (s->direction == PA_STREAM_PLAYBACK) {
        /* Find a place to store the write_index correction data for this entry */
        cidx = (s->current_write_index_correction + 1) % PA_MAX_WRITE_INDEX_CORRECTIONS;

        /* Check if we could allocate a correction slot. If not, there are too many outstanding queries */
        PA_CHECK_VALIDITY_RETURN_NULL(s->context, !s->write_index_corrections[cidx].valid, PA_ERR_INTERNAL);
    }
    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_GET_PLAYBACK_LATENCY : PA_COMMAND_GET_RECORD_LATENCY),
            &tag);
    pa_tagstruct_putu32(t, s->channel);
    pa_tagstruct_put_timeval(t, pa_gettimeofday(&now));

    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, stream_get_timing_info_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    if (s->direction == PA_STREAM_PLAYBACK) {
        /* Fill in initial correction data */

        s->current_write_index_correction = cidx;

        s->write_index_corrections[cidx].valid = true;
        s->write_index_corrections[cidx].absolute = false;
        s->write_index_corrections[cidx].corrupt = false;
        s->write_index_corrections[cidx].tag = tag;
        s->write_index_corrections[cidx].value = 0;
    }

    return o;
}

void pa_stream_disconnect_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_stream *s = userdata;

    pa_assert(pd);
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    pa_stream_ref(s);

    if (command != PA_COMMAND_REPLY) {
        if (pa_context_handle_error(s->context, command, t, false) < 0)
            goto finish;

        pa_stream_set_state(s, PA_STREAM_FAILED);
        goto finish;
    } else if (!pa_tagstruct_eof(t)) {
        pa_context_fail(s->context, PA_ERR_PROTOCOL);
        goto finish;
    }

    pa_stream_set_state(s, PA_STREAM_TERMINATED);

finish:
    pa_stream_unref(s);
}

int pa_stream_disconnect(pa_stream *s) {
    pa_tagstruct *t;
    uint32_t tag;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->channel_valid, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->context->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);

    pa_stream_ref(s);

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_DELETE_PLAYBACK_STREAM :
                        (s->direction == PA_STREAM_RECORD ? PA_COMMAND_DELETE_RECORD_STREAM : PA_COMMAND_DELETE_UPLOAD_STREAM)),
            &tag);
    pa_tagstruct_putu32(t, s->channel);
    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_disconnect_callback, s, NULL);

    pa_stream_unref(s);
    return 0;
}

void pa_stream_set_read_callback(pa_stream *s, pa_stream_request_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->read_callback = cb;
    s->read_userdata = userdata;
}

void pa_stream_set_write_callback(pa_stream *s, pa_stream_request_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->write_callback = cb;
    s->write_userdata = userdata;
}

void pa_stream_set_state_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->state_callback = cb;
    s->state_userdata = userdata;
}

void pa_stream_set_overflow_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->overflow_callback = cb;
    s->overflow_userdata = userdata;
}

void pa_stream_set_underflow_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->underflow_callback = cb;
    s->underflow_userdata = userdata;
}

void pa_stream_set_latency_update_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->latency_update_callback = cb;
    s->latency_update_userdata = userdata;
}

void pa_stream_set_moved_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->moved_callback = cb;
    s->moved_userdata = userdata;
}

void pa_stream_set_suspended_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->suspended_callback = cb;
    s->suspended_userdata = userdata;
}

void pa_stream_set_started_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->started_callback = cb;
    s->started_userdata = userdata;
}

void pa_stream_set_event_callback(pa_stream *s, pa_stream_event_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->event_callback = cb;
    s->event_userdata = userdata;
}

void pa_stream_set_buffer_attr_callback(pa_stream *s, pa_stream_notify_cb_t cb, void *userdata) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (pa_detect_fork())
        return;

    if (s->state == PA_STREAM_TERMINATED || s->state == PA_STREAM_FAILED)
        return;

    s->buffer_attr_callback = cb;
    s->buffer_attr_userdata = userdata;
}

void pa_stream_simple_ack_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_operation *o = userdata;
    int success = 1;

    pa_assert(pd);
    pa_assert(o);
    pa_assert(PA_REFCNT_VALUE(o) >= 1);

    if (!o->context)
        goto finish;

    if (command != PA_COMMAND_REPLY) {
        if (pa_context_handle_error(o->context, command, t, false) < 0)
            goto finish;

        success = 0;
    } else if (!pa_tagstruct_eof(t)) {
        pa_context_fail(o->context, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (o->callback) {
        pa_stream_success_cb_t cb = (pa_stream_success_cb_t) o->callback;
        cb(o->stream, success, o->userdata);
    }

finish:
    pa_operation_done(o);
    pa_operation_unref(o);
}

pa_operation* pa_stream_cork(pa_stream *s, int b, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;
    pa_tagstruct *t;
    uint32_t tag;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);

    /* Ask for a timing update before we cork/uncork to get the best
     * accuracy for the transport latency suitable for the
     * check_smoother_status() call in the started callback */
    request_auto_timing_update(s, true);

    s->corked = b;

    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_CORK_PLAYBACK_STREAM : PA_COMMAND_CORK_RECORD_STREAM),
            &tag);
    pa_tagstruct_putu32(t, s->channel);
    pa_tagstruct_put_boolean(t, !!b);
    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    check_smoother_status(s, false, false, false);

    /* This might cause the indexes to hang/start again, hence let's
     * request a timing update, after the cork/uncork, too */
    request_auto_timing_update(s, true);

    return o;
}

static pa_operation* stream_send_simple_command(pa_stream *s, uint32_t command, pa_stream_success_cb_t cb, void *userdata) {
    pa_tagstruct *t;
    pa_operation *o;
    uint32_t tag;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);

    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(s->context, command, &tag);
    pa_tagstruct_putu32(t, s->channel);
    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    return o;
}

pa_operation* pa_stream_flush(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);

    /* Ask for a timing update *before* the flush, so that the
     * transport usec is as up to date as possible when we get the
     * underflow message and update the smoother status*/
    request_auto_timing_update(s, true);

    if (!(o = stream_send_simple_command(s, (uint32_t) (s->direction == PA_STREAM_PLAYBACK ? PA_COMMAND_FLUSH_PLAYBACK_STREAM : PA_COMMAND_FLUSH_RECORD_STREAM), cb, userdata)))
        return NULL;

    if (s->direction == PA_STREAM_PLAYBACK) {

        if (s->write_index_corrections[s->current_write_index_correction].valid)
            s->write_index_corrections[s->current_write_index_correction].corrupt = true;

        if (s->buffer_attr.prebuf > 0)
            check_smoother_status(s, false, false, true);

        /* This will change the write index, but leave the
         * read index untouched. */
        invalidate_indexes(s, false, true);

    } else
        /* For record streams this has no influence on the write
         * index, but the read index might jump. */
        invalidate_indexes(s, true, false);

    /* Note that we do not update requested_bytes here. This is
     * because we cannot really know how data actually was dropped
     * from the write index due to this. This 'error' will be applied
     * by both client and server and hence we should be fine. */

    return o;
}

pa_operation* pa_stream_prebuf(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->buffer_attr.prebuf > 0, PA_ERR_BADSTATE);

    /* Ask for a timing update before we cork/uncork to get the best
     * accuracy for the transport latency suitable for the
     * check_smoother_status() call in the started callback */
    request_auto_timing_update(s, true);

    if (!(o = stream_send_simple_command(s, PA_COMMAND_PREBUF_PLAYBACK_STREAM, cb, userdata)))
        return NULL;

    /* This might cause the read index to hang again, hence
     * let's request a timing update */
    request_auto_timing_update(s, true);

    return o;
}

pa_operation* pa_stream_trigger(pa_stream *s, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction == PA_STREAM_PLAYBACK, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->buffer_attr.prebuf > 0, PA_ERR_BADSTATE);

    /* Ask for a timing update before we cork/uncork to get the best
     * accuracy for the transport latency suitable for the
     * check_smoother_status() call in the started callback */
    request_auto_timing_update(s, true);

    if (!(o = stream_send_simple_command(s, PA_COMMAND_TRIGGER_PLAYBACK_STREAM, cb, userdata)))
        return NULL;

    /* This might cause the read index to start moving again, hence
     * let's request a timing update */
    request_auto_timing_update(s, true);

    return o;
}

pa_operation* pa_stream_set_name(pa_stream *s, const char *name, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(name);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);

    if (s->context->version >= 13) {
        pa_proplist *p = pa_proplist_new();

        pa_proplist_sets(p, PA_PROP_MEDIA_NAME, name);
        o = pa_stream_proplist_update(s, PA_UPDATE_REPLACE, p, cb, userdata);
        pa_proplist_free(p);
    } else {
        pa_tagstruct *t;
        uint32_t tag;

        o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);
        t = pa_tagstruct_command(
                s->context,
                (uint32_t) (s->direction == PA_STREAM_RECORD ? PA_COMMAND_SET_RECORD_STREAM_NAME : PA_COMMAND_SET_PLAYBACK_STREAM_NAME),
                &tag);
        pa_tagstruct_putu32(t, s->channel);
        pa_tagstruct_puts(t, name);
        pa_pstream_send_tagstruct(s->context->pstream, t);
        pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);
    }

    return o;
}

int pa_stream_get_time(pa_stream *s, pa_usec_t *r_usec) {
    pa_usec_t usec;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->timing_info_valid, PA_ERR_NODATA);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_PLAYBACK || !s->timing_info.read_index_corrupt, PA_ERR_NODATA);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_RECORD || !s->timing_info.write_index_corrupt, PA_ERR_NODATA);

    if (s->smoother)
        usec = pa_smoother_get(s->smoother, pa_rtclock_now());
    else
        usec = calc_time(s, false);

    /* Make sure the time runs monotonically */
    if (!(s->flags & PA_STREAM_NOT_MONOTONIC)) {
        if (usec < s->previous_time)
            usec = s->previous_time;
        else
            s->previous_time = usec;
    }

    if (r_usec)
        *r_usec = usec;

    return 0;
}

static pa_usec_t time_counter_diff(pa_stream *s, pa_usec_t a, pa_usec_t b, int *negative) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    if (negative)
        *negative = 0;

    if (a >= b)
        return a-b;
    else {
        if (negative && s->direction == PA_STREAM_RECORD) {
            *negative = 1;
            return b-a;
        } else
            return 0;
    }
}

int pa_stream_get_latency(pa_stream *s, pa_usec_t *r_usec, int *negative) {
    pa_usec_t t, c;
    int r;
    int64_t cindex;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(r_usec);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->timing_info_valid, PA_ERR_NODATA);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_PLAYBACK || !s->timing_info.write_index_corrupt, PA_ERR_NODATA);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_RECORD || !s->timing_info.read_index_corrupt, PA_ERR_NODATA);

    if ((r = pa_stream_get_time(s, &t)) < 0)
        return r;

    if (s->direction == PA_STREAM_PLAYBACK)
        cindex = s->timing_info.write_index;
    else
        cindex = s->timing_info.read_index;

    if (cindex < 0)
        cindex = 0;

    c = pa_bytes_to_usec((uint64_t) cindex, &s->sample_spec);

    if (s->direction == PA_STREAM_PLAYBACK)
        *r_usec = time_counter_diff(s, c, t, negative);
    else
        *r_usec = time_counter_diff(s, t, c, negative);

    return 0;
}

const pa_timing_info* pa_stream_get_timing_info(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->timing_info_valid, PA_ERR_NODATA);

    return &s->timing_info;
}

const pa_sample_spec* pa_stream_get_sample_spec(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);

    return &s->sample_spec;
}

const pa_channel_map* pa_stream_get_channel_map(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);

    return &s->channel_map;
}

const pa_format_info* pa_stream_get_format_info(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    /* We don't have the format till routing is done */
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);

    return s->format;
}
const pa_buffer_attr* pa_stream_get_buffer_attr(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->context->version >= 9, PA_ERR_NOTSUPPORTED);

    return &s->buffer_attr;
}

static void stream_set_buffer_attr_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_operation *o = userdata;
    int success = 1;

    pa_assert(pd);
    pa_assert(o);
    pa_assert(PA_REFCNT_VALUE(o) >= 1);

    if (!o->context)
        goto finish;

    if (command != PA_COMMAND_REPLY) {
        if (pa_context_handle_error(o->context, command, t, false) < 0)
            goto finish;

        success = 0;
    } else {
        if (o->stream->direction == PA_STREAM_PLAYBACK) {
            if (pa_tagstruct_getu32(t, &o->stream->buffer_attr.maxlength) < 0 ||
                pa_tagstruct_getu32(t, &o->stream->buffer_attr.tlength) < 0 ||
                pa_tagstruct_getu32(t, &o->stream->buffer_attr.prebuf) < 0 ||
                pa_tagstruct_getu32(t, &o->stream->buffer_attr.minreq) < 0) {
                pa_context_fail(o->context, PA_ERR_PROTOCOL);
                goto finish;
            }
        } else if (o->stream->direction == PA_STREAM_RECORD) {
            if (pa_tagstruct_getu32(t, &o->stream->buffer_attr.maxlength) < 0 ||
                pa_tagstruct_getu32(t, &o->stream->buffer_attr.fragsize) < 0) {
                pa_context_fail(o->context, PA_ERR_PROTOCOL);
                goto finish;
            }
        }

        if (o->stream->context->version >= 13) {
            pa_usec_t usec;

            if (pa_tagstruct_get_usec(t, &usec) < 0) {
                pa_context_fail(o->context, PA_ERR_PROTOCOL);
                goto finish;
            }

            if (o->stream->direction == PA_STREAM_RECORD)
                o->stream->timing_info.configured_source_usec = usec;
            else
                o->stream->timing_info.configured_sink_usec = usec;
        }

        if (!pa_tagstruct_eof(t)) {
            pa_context_fail(o->context, PA_ERR_PROTOCOL);
            goto finish;
        }
    }

    if (o->callback) {
        pa_stream_success_cb_t cb = (pa_stream_success_cb_t) o->callback;
        cb(o->stream, success, o->userdata);
    }

finish:
    pa_operation_done(o);
    pa_operation_unref(o);
}

pa_operation* pa_stream_set_buffer_attr(pa_stream *s, const pa_buffer_attr *attr, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;
    pa_tagstruct *t;
    uint32_t tag;
    pa_buffer_attr copy;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);
    pa_assert(attr);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->context->version >= 12, PA_ERR_NOTSUPPORTED);

    /* Ask for a timing update before we cork/uncork to get the best
     * accuracy for the transport latency suitable for the
     * check_smoother_status() call in the started callback */
    request_auto_timing_update(s, true);

    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_RECORD ? PA_COMMAND_SET_RECORD_STREAM_BUFFER_ATTR : PA_COMMAND_SET_PLAYBACK_STREAM_BUFFER_ATTR),
            &tag);
    pa_tagstruct_putu32(t, s->channel);

    copy = *attr;
    patch_buffer_attr(s, &copy, NULL);
    attr = &copy;

    pa_tagstruct_putu32(t, attr->maxlength);

    if (s->direction == PA_STREAM_PLAYBACK)
        pa_tagstruct_put(
                t,
                PA_TAG_U32, attr->tlength,
                PA_TAG_U32, attr->prebuf,
                PA_TAG_U32, attr->minreq,
                PA_TAG_INVALID);
    else
        pa_tagstruct_putu32(t, attr->fragsize);

    if (s->context->version >= 13)
        pa_tagstruct_put_boolean(t, !!(s->flags & PA_STREAM_ADJUST_LATENCY));

    if (s->context->version >= 14)
        pa_tagstruct_put_boolean(t, !!(s->flags & PA_STREAM_EARLY_REQUESTS));

    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, stream_set_buffer_attr_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    /* This might cause changes in the read/write index, hence let's
     * request a timing update */
    request_auto_timing_update(s, true);

    return o;
}

uint32_t pa_stream_get_device_index(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_ANY(s->context, !pa_detect_fork(), PA_ERR_FORKED, PA_INVALID_INDEX);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE, PA_INVALID_INDEX);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE, PA_INVALID_INDEX);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->context->version >= 12, PA_ERR_NOTSUPPORTED, PA_INVALID_INDEX);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->device_index != PA_INVALID_INDEX, PA_ERR_BADSTATE, PA_INVALID_INDEX);

    return s->device_index;
}

const char *pa_stream_get_device_name(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->context->version >= 12, PA_ERR_NOTSUPPORTED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->device_name, PA_ERR_BADSTATE);

    return s->device_name;
}

int pa_stream_is_suspended(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->context->version >= 12, PA_ERR_NOTSUPPORTED);

    return s->suspended;
}

int pa_stream_is_corked(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);

    return s->corked;
}

static void stream_update_sample_rate_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_operation *o = userdata;
    int success = 1;

    pa_assert(pd);
    pa_assert(o);
    pa_assert(PA_REFCNT_VALUE(o) >= 1);

    if (!o->context)
        goto finish;

    if (command != PA_COMMAND_REPLY) {
        if (pa_context_handle_error(o->context, command, t, false) < 0)
            goto finish;

        success = 0;
    } else {

        if (!pa_tagstruct_eof(t)) {
            pa_context_fail(o->context, PA_ERR_PROTOCOL);
            goto finish;
        }
    }

    o->stream->sample_spec.rate = PA_PTR_TO_UINT(o->private);
    pa_assert(pa_sample_spec_valid(&o->stream->sample_spec));

    if (o->callback) {
        pa_stream_success_cb_t cb = (pa_stream_success_cb_t) o->callback;
        cb(o->stream, success, o->userdata);
    }

finish:
    pa_operation_done(o);
    pa_operation_unref(o);
}

pa_operation *pa_stream_update_sample_rate(pa_stream *s, uint32_t rate, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;
    pa_tagstruct *t;
    uint32_t tag;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, pa_sample_rate_valid(rate), PA_ERR_INVALID);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->flags & PA_STREAM_VARIABLE_RATE, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->context->version >= 12, PA_ERR_NOTSUPPORTED);

    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);
    o->private = PA_UINT_TO_PTR(rate);

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_RECORD ? PA_COMMAND_UPDATE_RECORD_STREAM_SAMPLE_RATE : PA_COMMAND_UPDATE_PLAYBACK_STREAM_SAMPLE_RATE),
            &tag);
    pa_tagstruct_putu32(t, s->channel);
    pa_tagstruct_putu32(t, rate);

    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, stream_update_sample_rate_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    return o;
}

pa_operation *pa_stream_proplist_update(pa_stream *s, pa_update_mode_t mode, pa_proplist *p, pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;
    pa_tagstruct *t;
    uint32_t tag;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, mode == PA_UPDATE_SET || mode == PA_UPDATE_MERGE || mode == PA_UPDATE_REPLACE, PA_ERR_INVALID);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->context->version >= 13, PA_ERR_NOTSUPPORTED);

    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_RECORD ? PA_COMMAND_UPDATE_RECORD_STREAM_PROPLIST : PA_COMMAND_UPDATE_PLAYBACK_STREAM_PROPLIST),
            &tag);
    pa_tagstruct_putu32(t, s->channel);
    pa_tagstruct_putu32(t, (uint32_t) mode);
    pa_tagstruct_put_proplist(t, p);

    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    /* Please note that we don't update s->proplist here, because we
     * don't export that field */

    return o;
}

pa_operation *pa_stream_proplist_remove(pa_stream *s, const char *const keys[], pa_stream_success_cb_t cb, void *userdata) {
    pa_operation *o;
    pa_tagstruct *t;
    uint32_t tag;
    const char * const*k;

    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, keys && keys[0], PA_ERR_INVALID);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->context->version >= 13, PA_ERR_NOTSUPPORTED);

    o = pa_operation_new(s->context, s, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(
            s->context,
            (uint32_t) (s->direction == PA_STREAM_RECORD ? PA_COMMAND_REMOVE_RECORD_STREAM_PROPLIST : PA_COMMAND_REMOVE_PLAYBACK_STREAM_PROPLIST),
            &tag);
    pa_tagstruct_putu32(t, s->channel);

    for (k = keys; *k; k++)
        pa_tagstruct_puts(t, *k);

    pa_tagstruct_puts(t, NULL);

    pa_pstream_send_tagstruct(s->context->pstream, t);
    pa_pdispatch_register_reply(s->context->pdispatch, tag, DEFAULT_TIMEOUT, pa_stream_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    /* Please note that we don't update s->proplist here, because we
     * don't export that field */

    return o;
}

int pa_stream_set_monitor_stream(pa_stream *s, uint32_t sink_input_idx) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY(s->context, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY(s->context, sink_input_idx != PA_INVALID_INDEX, PA_ERR_INVALID);
    PA_CHECK_VALIDITY(s->context, s->state == PA_STREAM_UNCONNECTED, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY(s->context, s->context->version >= 13, PA_ERR_NOTSUPPORTED);

    s->direct_on_input = sink_input_idx;

    return 0;
}

uint32_t pa_stream_get_monitor_stream(pa_stream *s) {
    pa_assert(s);
    pa_assert(PA_REFCNT_VALUE(s) >= 1);

    PA_CHECK_VALIDITY_RETURN_ANY(s->context, !pa_detect_fork(), PA_ERR_FORKED, PA_INVALID_INDEX);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->direct_on_input != PA_INVALID_INDEX, PA_ERR_BADSTATE, PA_INVALID_INDEX);
    PA_CHECK_VALIDITY_RETURN_ANY(s->context, s->context->version >= 13, PA_ERR_NOTSUPPORTED, PA_INVALID_INDEX);

    return s->direct_on_input;
}