Fix git-version file creation.
[paraslash.git] / audiod.c
index e0a455d..8dd69c6 100644 (file)
--- a/audiod.c
+++ b/audiod.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -10,6 +10,7 @@
 #include <dirent.h>
 #include <signal.h>
 #include <openssl/rc4.h>
+#include <stdbool.h>
 
 #include "para.h"
 #include "error.h"
@@ -19,6 +20,7 @@
 #include "sched.h"
 #include "ggo.h"
 #include "recv.h"
+#include "buffer_tree.h"
 #include "filter.h"
 #include "grab_client.h"
 #include "client.cmdline.h"
@@ -31,6 +33,7 @@
 #include "write.h"
 #include "write_common.h"
 #include "signal.h"
+#include "version.h"
 
 /** define the array of error lists needed by para_audiod */
 INIT_AUDIOD_ERRLISTS;
@@ -90,6 +93,7 @@ struct status_task {
        struct timeval restart_barrier;
        /** Last time we received status data from para_server. */
        struct timeval last_status_read;
+       size_t min_iqs;
        /** The offset value announced by para_server. */
        int offset_seconds;
        /** The length of the current audio file as announced by para_server. */
@@ -108,6 +112,8 @@ struct status_task {
        struct timeval clock_diff_barrier;
        /** Number of the audio format as announced by para_server. */
        int current_audio_format_num;
+       /* The status task btrn is the child of the client task. */
+       struct btr_node *btrn;
 };
 
 /** The array of status items sent by para_server. */
@@ -138,7 +144,6 @@ static struct status_task status_task_struct;
  * \sa struct status_task
  */
 static struct status_task *stat_task = &status_task_struct;
-static struct timeval initial_delay_barrier;
 
 /**
  * the task for handling audiod commands
@@ -156,8 +161,9 @@ struct command_task {
 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 
 /**
- * get the audio format number
- * \param name the name of the audio format
+ * Get the audio format number.
+ *
+ * \param name The name of the audio format.
  *
  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
  * \a name is not a supported audio format.
@@ -174,13 +180,37 @@ int get_audio_format_num(const char *name)
        return -E_UNSUPPORTED_AUDIO_FORMAT;
 }
 
+/**
+ * Compute the play time based on information of the given slot.
+ *
+ * \param slot_num The slot number (negative means: no slot).
+ *
+ * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
+ * from the status items received from para_server and the start time of the
+ * (first) writer of the given slot.
+ *
+ * It has to to take into account that probably the stream was not started at
+ * the beginning of the file, that the clock between the server and the client
+ * host may differ and that playback of the stream was delayed, e.g. because
+ * the prebuffer filter is used in the filter configuration of the given slot.
+ *
+ * If no writer is active in the given slot, or \a slot_num is negative
+ * (indicating that para_audiod runs in standby mode), an approximation based
+ * only on the status items is computed and the returned string is prefixed
+ * with "~".
+ *
+ * \return A string that must be freed by the caller.
+ */
 char *get_time_string(int slot_num)
 {
        int ret, seconds = 0, length;
        struct timeval *tmp, sum, sss, /* server stream start */
+               rstime, /* receiver start time */
+               wstime, /* writer start time */
                wtime, /* now - writer start */
                rskip; /* receiver start - sss */
        struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
+       char *msg;
 
        if (audiod_status == AUDIOD_OFF)
                goto empty;
@@ -191,27 +221,41 @@ char *get_time_string(int slot_num)
        }
        if (audiod_status == AUDIOD_ON && !s)
                goto empty;
-       /* valid status items and playing */
-       if (s) { /* writer active in this slot */
-               length = s->seconds_total;
-               tmp = &s->server_stream_start;
-       } else { /* standby mode, rely on status items */
-               length = stat_task->length_seconds;
-               tmp = &stat_task->server_stream_start;
+       /*
+        * Valid status items and playing, set length and tmp to the stream
+        * start. We use the slot info and fall back to the info from current
+        * status items if no slot info is available.
+        */
+       length = stat_task->length_seconds;
+       tmp = &stat_task->server_stream_start;
+       if (s && s->wns) { /* writer active in this slot */
+               btr_get_node_start(s->wns[0].btrn, &wstime);
+               if (wstime.tv_sec != 0) { /* writer wrote something */
+                       if (s->server_stream_start.tv_sec == 0) {
+                               /* copy status info to slot */
+                               s->server_stream_start = stat_task->server_stream_start;
+                               s->offset_seconds = stat_task->offset_seconds;
+                               s->seconds_total = stat_task->length_seconds;
+                       }
+                       length = s->seconds_total;
+                       tmp = &s->server_stream_start;
+               }
        }
        if (stat_task->sa_time_diff_sign > 0)
                tv_diff(tmp, &stat_task->sa_time_diff, &sss);
        else
                tv_add(tmp, &stat_task->sa_time_diff, &sss);
-       if (!s) {
+       if (!s || !s->wns) {
                struct timeval diff;
                tv_diff(now, &sss, &diff);
                seconds = diff.tv_sec + stat_task->offset_seconds;
                goto out;
        }
-       tv_diff(now, &s->wstime, &wtime);
+       tv_diff(now, &wstime, &wtime);
+       //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
        seconds = s->offset_seconds;
-       ret = tv_diff(&s->rstime, &sss, &rskip);
+       btr_get_node_start(s->receiver_node->btrn, &rstime);
+       ret = tv_diff(&rstime, &sss, &rskip);
        if (ret > 0) { /* audiod was started in the middle of the stream */
                tv_add(&wtime, &rskip, &sum);
                seconds += sum.tv_sec;
@@ -220,7 +264,7 @@ char *get_time_string(int slot_num)
 out:
        seconds = PARA_MIN(seconds, length);
        seconds = PARA_MAX(seconds, 0);
-       return make_message(
+       msg = make_message(
                "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
                s? "" : "~",
                seconds / 60,
@@ -231,6 +275,8 @@ out:
                length / 60,
                length % 60
        );
+       PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
+       return msg;
 empty:
        return para_strdup(NULL);
 }
@@ -310,29 +356,98 @@ static void close_receiver(int slot_num)
        PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
                audio_formats[s->format], slot_num);
        a->receiver->close(s->receiver_node);
+       btr_free_node(s->receiver_node->btrn);
        free(s->receiver_node);
        s->receiver_node = NULL;
+       tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
+               &a->restart_barrier);
 }
 
-static void kill_all_decoders(int error)
+static void writer_cleanup(struct writer_node *wn)
+{
+       struct writer *w;
+
+       if (!wn)
+               return;
+       w = writers + wn->writer_num;
+       PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
+       w->close(wn);
+       btr_free_node(wn->btrn);
+}
+
+static void close_writers(struct slot_info *s)
 {
+       struct audio_format_info *a;
        int i;
 
+       if (s->format < 0)
+               return;
+       assert(s->wns);
+       a = afi + s->format;
+       if (a->num_writers == 0)
+               writer_cleanup(s->wns);
+       else {
+               for (i = 0; i < a->num_writers; i++)
+                       writer_cleanup(s->wns + i);
+       }
+       free(s->wns);
+       s->wns = NULL;
+}
+
+static void close_filters(struct slot_info *s)
+{
+       int i;
+       struct audio_format_info *a = afi + s->format;
+       if (a->num_filters == 0)
+               return;
+       for (i = 0; i < a->num_filters; i++) {
+               struct filter_node *fn = s->fns + i;
+               struct filter *f;
+
+               if (!fn)
+                       continue;
+               f = filters + fn->filter_num;
+               if (f->close)
+                       f->close(fn);
+               btr_free_node(fn->btrn);
+       }
+       free(s->fns);
+       s->fns = NULL;
+}
+
+/*
+ * Whenever a task commits suicide by returning from post_select with t->error
+ * < 0, it also removes its btr node. We do exactly that to kill a running
+ * task. Note that the scheduler checks t->error also _before_ each pre/post
+ * select call, so the victim will never be scheduled again.
+ */
+static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
+{
+       if (t->error < 0)
+               return;
+       t->error = error;
+       btr_remove_node(btrn);
+}
+
+static void kill_all_decoders(int error)
+{
+       int i, j;
+
        FOR_EACH_SLOT(i) {
                struct slot_info *s = &slot[i];
-               if (s->wng && s->wng->task.error >= 0) {
-                       PARA_INFO_LOG("deactivating wng in slot %d\n",
-                               i);
-                       s->wng->task.error = error;
-               }
-               if (s->fc && s->fc->task.error >= 0) {
-                       PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
-                       s->fc->task.error = error;
-               }
-               if (s->receiver_node && s->receiver_node->task.error >= 0) {
-                       PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
-                       s->receiver_node->task.error = error;
-               }
+               struct audio_format_info *a;
+               if (s->format < 0)
+                       continue;
+               a = afi + s->format;
+               if (s->wns)
+                       for (j = 0; j < a->num_writers; j++)
+                               kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
+               if (s->fns)
+                       for (j = 0; j < a->num_writers; j++)
+                               kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
+               if (s->receiver_node)
+                       kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
+                               error);
        }
 }
 
@@ -347,7 +462,7 @@ static int get_empty_slot(void)
                        clear_slot(i);
                        return i;
                }
-               if (s->wng || s->receiver_node || s->fc)
+               if (s->wns || s->receiver_node || s->fns)
                        continue;
                clear_slot(i);
                return i;
@@ -369,172 +484,173 @@ int num_filters(int audio_format_num)
        return afi[audio_format_num].num_filters;
 }
 
-static void open_filters(int slot_num)
+static void open_filters(struct slot_info *s)
 {
-       struct slot_info *s = &slot[slot_num];
-       struct audio_format_info *a = &afi[s->format];
+       struct audio_format_info *a = afi + s->format;
        struct filter_node *fn;
        int nf = a->num_filters;
+       struct btr_node *parent;
        int i;
 
-       s->fc = NULL;
-       if (!nf)
+       if (nf == 0)
                return;
        PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
-       s->fc = para_calloc(sizeof(struct filter_chain));
-       s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
-       s->fc->inbufp = &s->receiver_node->buf;
-       s->fc->in_loaded = &s->receiver_node->loaded;
-       s->fc->input_error = &s->receiver_node->task.error;
-       s->fc->task.pre_select = NULL;
-       s->fc->task.post_select = filter_post_select;
-       s->fc->task.error = 0;
-       s->fc->num_filters = nf;
-
-       s->receiver_node->output_error = &s->fc->task.error;
-       sprintf(s->fc->task.status, "filter chain");
-       FOR_EACH_FILTER_NODE(fn, s->fc, i) {
+       assert(s->fns == NULL);
+       s->fns = para_calloc(nf * sizeof(struct filter_node));
+       parent = s->receiver_node->btrn;
+       for (i = 0; i < nf; i++) {
                struct filter *f = filters + a->filter_nums[i];
+               fn = s->fns + i;
                fn->filter_num = a->filter_nums[i];
                fn->conf = a->filter_conf[i];
-               fn->fc = s->fc;
-               fn->loaded = 0;
-               INIT_LIST_HEAD(&fn->callbacks);
+               fn->task.pre_select = f->pre_select;
+               fn->task.post_select = f->post_select;
+
+               fn->btrn = btr_new_node(&(struct btr_node_description)
+                       EMBRACE(.name = f->name, .parent = parent,
+                               .handler = f->execute, .context = fn));
+
                f->open(fn);
+               register_task(&fn->task);
+               parent = fn->btrn;
                PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
-                       audio_formats[s->format], i,  nf, f->name, slot_num);
-               s->fc->outbufp = &fn->buf;
-               s->fc->out_loaded = &fn->loaded;
+                       audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
+               sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
        }
-       register_task(&s->fc->task);
 }
 
-static void open_writers(int slot_num)
+static void open_writers(struct slot_info *s)
 {
-       int ret, i;
-       struct slot_info *s = &slot[slot_num];
-       struct audio_format_info *a = &afi[s->format];
-
-       PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
-       if (!a->num_writers)
-               s->wng = setup_default_wng();
-       else
-               s->wng = wng_new(a->num_writers);
-       if (s->fc) {
-               s->wng->bufp = s->fc->outbufp;
-               s->wng->loaded = s->fc->out_loaded;
-               s->wng->input_error = &s->fc->task.error;
-               s->wng->channels = &s->fc->channels;
-               s->wng->samplerate = &s->fc->samplerate;
-               s->fc->output_error = &s->wng->task.error;
-               PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
-       } else {
-               s->wng->bufp = &s->receiver_node->buf;
-               s->wng->loaded = &s->receiver_node->loaded;
-               s->wng->input_error = &s->receiver_node->task.error;
-       }
-       for (i = 0; i < a->num_writers; i++) {
-               s->wng->writer_nodes[i].conf = a->writer_conf[i];
-               s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
+       int i;
+       struct audio_format_info *a = afi + s->format;
+       struct writer_node *wn;
+       struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
+
+       assert(s->wns == NULL);
+       s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
+               * sizeof(struct writer_node));
+       if (a->num_writers == 0)
+               setup_writer_node(NULL, parent, s->wns);
+       else {
+               PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
+               for (i = 0; i < a->num_writers; i++) {
+                       wn = s->wns + i;
+                       wn->conf = a->writer_conf[i];
+                       wn->writer_num = a->writer_nums[i];
+                       register_writer_node(wn, parent);
+               }
        }
-       ret = wng_open(s->wng);
-       if (ret < 0)
-               return;
-       s->wstime = *now;
-       s->server_stream_start = stat_task->server_stream_start.tv_sec?
-               stat_task->server_stream_start : *now;
-       s->offset_seconds = stat_task->offset_seconds;
-       s->seconds_total = stat_task->length_seconds;
-       activate_inactive_grab_clients(s->format, s->fc);
 }
 
+/* returns slot num on success */
 static int open_receiver(int format)
 {
        struct audio_format_info *a = &afi[format];
        struct slot_info *s;
        int ret, slot_num;
+       struct receiver *r = a->receiver;
        struct receiver_node *rn;
-       const struct timeval restart_delay = {2, 0};
 
+       tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
        ret = get_empty_slot();
        if (ret < 0)
-               goto err;
+               return ret;
        slot_num = ret;
-       s = &slot[slot_num];
-       s->format = format;
-       s->receiver_node = para_calloc(sizeof(struct receiver_node));
-       rn = s->receiver_node;
-       rn->receiver = a->receiver;
+       rn = para_calloc(sizeof(*rn));
+       rn->receiver = r;
        rn->conf = a->receiver_conf;
-       ret = a->receiver->open(s->receiver_node);
+       rn->btrn = btr_new_node(&(struct btr_node_description)
+               EMBRACE(.name = r->name, .context = rn));
+       ret = r->open(rn);
        if (ret < 0) {
-               free(s->receiver_node);
-               s->receiver_node = NULL;
-               goto err;
+               btr_free_node(rn->btrn);
+               free(rn);
+               return ret;
        }
+       s = &slot[slot_num];
+       s->format = format;
+       s->receiver_node = rn;
        PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
-               audio_formats[s->format], a->receiver->name, slot_num);
-       rn->task.pre_select = a->receiver->pre_select;
-       rn->task.post_select = a->receiver->post_select;
-       s->rstime = *now;
-       sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
+               audio_formats[format], r->name, slot_num);
+       rn->task.pre_select = r->pre_select;
+       rn->task.post_select = r->post_select;
+       sprintf(rn->task.status, "%s receiver node", r->name);
        register_task(&rn->task);
-       ret = 1;
-err:
-       if (ret < 0)
-               PARA_ERROR_LOG("%s\n", para_strerror(-ret));
-       tv_add(now, &restart_delay, &afi[format].restart_barrier);
-       return ret;
+       return slot_num;
 }
 
-/* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
-static int receiver_running(int format)
+static bool receiver_running(void)
 {
-       int i, ret = 0;
+       int i;
+       long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 
        FOR_EACH_SLOT(i) {
                struct slot_info *s = &slot[i];
-               if (s->format != format)
-                       continue;
+               long unsigned ss2 = s->server_stream_start.tv_sec;
+
                if (!s->receiver_node)
                        continue;
                if (s->receiver_node->task.error >= 0)
-                       return 1;
-               ret = -1;
+                       return true;
+               if (ss1 == ss2)
+                       return true;
        }
-       return ret;
+       return false;
 }
 
-static void open_current_receiver(struct sched *s)
+/**
+ * Return the root node of the current buffer tree.
+ *
+ * This is only used for stream grabbing.
+ *
+ * \return \p NULL if no slot is currently active. If more than one buffer tree
+ * exists, the node corresponding to the most recently started receiver is
+ * returned.
+ */
+struct btr_node *audiod_get_btr_root(void)
 {
-       struct timeval diff;
-       int ret, cafn = stat_task->current_audio_format_num;
+       int i, newest_slot = -1;
+       struct timeval newest_rstime = {0, 0};
 
-       if (cafn < 0 || !stat_task->ct)
-               return;
-       /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
-       if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
-               return;
-       ret = receiver_running(cafn);
-       if (ret > 0) /* already running and not eof */
-               return;
-       if (ret < 0) { /* eof */
-               /*
-                * para_server uses a zero start time during the announcement
-                * period, i.e. before it sends the first chunk. Wait until
-                * this period begins to avoid restarting the receiver that
-                * belongs to the file just completed.
-                */
-               if (stat_task->server_stream_start.tv_sec)
-                       return;
-       }
-       if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
-               /* avoid busy loop */
-               s->timeout = diff;
-               return;
+       FOR_EACH_SLOT(i) {
+               struct slot_info *s = &slot[i];
+               struct timeval rstime;
+               if (!s->receiver_node)
+                       continue;
+               if (s->receiver_node->task.error < 0)
+                       continue;
+               btr_get_node_start(s->receiver_node->btrn, &rstime);
+               if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
+                       continue;
+               newest_rstime = rstime;
+               newest_slot = i;
        }
-       /* start a new receiver */
-       open_receiver(cafn);
+       if (newest_slot == -1)
+               return NULL;
+       return slot[newest_slot].receiver_node->btrn;
+}
+
+/* whether a new instance of a decoder should be started. */
+static bool must_start_decoder(void)
+{
+       int cafn = stat_task->current_audio_format_num;
+       unsigned vs = stat_task->vss_status;
+
+       if (audiod_status != AUDIOD_ON)
+               return false;
+       if (cafn < 0)
+               return false;
+       if (!stat_task->ct)
+               return false;
+       if (vs & VSS_STATUS_FLAG_NEXT)
+               return false;
+       if (!(vs & VSS_STATUS_FLAG_PLAYING))
+               return false;
+       if (receiver_running())
+               return false;
+       if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
+               return false;
+       return true;
 }
 
 static unsigned compute_time_diff(const struct timeval *status_time)
@@ -569,9 +685,9 @@ static unsigned compute_time_diff(const struct timeval *status_time)
                &tmp);
        stat_task->sa_time_diff = tmp;
        PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
-               sign > 0? "+" : "-",
+               sign < 0? "-" : "+",
                tv2ms(&diff),
-               sa_time_diff_sign ? "+" : "-",
+               sa_time_diff_sign < 0? "-" : "+",
                tv2ms(&stat_task->sa_time_diff)
        );
 out:
@@ -604,20 +720,8 @@ static int update_item(int itemnum, char *buf)
                break;
        case SI_STREAM_START:
                if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
-                       struct timeval a_start, delay;
-                       delay.tv_sec = conf.stream_delay_arg / 1000;
-                       delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
                        stat_task->server_stream_start.tv_sec = sec;
                        stat_task->server_stream_start.tv_usec = usec;
-                       if (compute_time_diff(NULL) > 2) {
-                               if (stat_task->sa_time_diff_sign < 0)
-                                       tv_add(&stat_task->server_stream_start,
-                                               &stat_task->sa_time_diff, &a_start);
-                               else
-                                       tv_diff(&stat_task->server_stream_start,
-                                               &stat_task->sa_time_diff, &a_start);
-                               tv_add(&a_start, &delay, &initial_delay_barrier);
-                       }
                }
                break;
        case SI_CURRENT_TIME:
@@ -720,6 +824,14 @@ static int parse_receiver_args(void)
                ret = get_audio_format_num(arg);
                if (ret < 0)
                        goto out;
+               /*
+                * If multiple receivers are given for this audio format, the
+                * last one wins and we have to free the previous receiver
+                * config here. Since we are iterating backwards, the winning
+                * receiver arg is in fact the first one given.
+                */
+               if (afi[ret].receiver_conf)
+                       afi[ret].receiver->free_config(afi[ret].receiver_conf);
                afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
                if (!afi[ret].receiver_conf) {
                        ret = -E_RECV_SYNTAX;
@@ -727,9 +839,9 @@ static int parse_receiver_args(void)
                }
                afi[ret].receiver = &receivers[receiver_num];
        }
-       /* use the first available receiver with no arguments
-        * for those audio formats for which no receiver
-        * was specified
+       /*
+        * Use the first available receiver with no arguments for those audio
+        * formats for which no receiver was specified.
         */
        cmd = para_strdup(receivers[0].name);
        FOR_EACH_AUDIO_FORMAT(i) {
@@ -758,6 +870,18 @@ static int init_default_filters(void)
 
                if (a->num_filters)
                        continue; /* no default -- nothing to to */
+               /*
+                * If udp is used to receive this audiod format, add fecdec as
+                * the first filter.
+                */
+               if (strcmp(afi[i].receiver->name, "udp") == 0 ||
+                               strcmp(afi[i].receiver->name, "dccp") == 0) {
+                       tmp = para_strdup("fecdec");
+                       add_filter(i, tmp);
+                       free(tmp);
+                       if (ret < 0)
+                               goto out;
+               }
                /* add "dec" to audio format name */
                tmp = make_message("%sdec", audio_formats[i]);
                for (j = 0; filters[j].name; j++)
@@ -783,7 +907,7 @@ static int parse_filter_args(void)
 {
        int i, ret, nf;
 
-       nf = PARA_MAX(1U, conf.filter_given);
+       nf = PARA_MAX(2U, conf.filter_given);
        PARA_INFO_LOG("maximal number of filters: %d\n", nf);
        FOR_EACH_AUDIO_FORMAT(i) {
                afi[i].filter_conf = para_malloc(nf * sizeof(void *));
@@ -868,19 +992,16 @@ static void signal_pre_select(struct sched *s, struct task *t)
        para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 }
 
-static void signal_post_select(struct sched *s, struct task *t)
+static void signal_post_select(struct sched *s, __a_unused struct task *t)
 {
-       struct signal_task *st = container_of(t, struct signal_task, task);
-
-       if (!FD_ISSET(st->fd, &s->rfds))
-               return;
+       int signum;
 
-       st->signum = para_next_signal();
-       switch (st->signum) {
+       signum = para_next_signal(&s->rfds);
+       switch (signum) {
        case SIGINT:
        case SIGTERM:
        case SIGHUP:
-               PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
+               PARA_EMERG_LOG("terminating on signal %d\n", signum);
                clean_exit(EXIT_FAILURE, "caught deadly signal");
        }
 }
@@ -903,19 +1024,18 @@ static void command_post_select(struct sched *s, struct task *t)
        int ret;
        struct command_task *ct = container_of(t, struct command_task, task);
        static struct timeval last_status_dump;
-       struct timeval tmp;
+       struct timeval tmp, delay = {0, 500 * 1000};
 
-       tv_add(&last_status_dump, &(struct timeval){0, 500 * 1000}, &tmp);
+       tv_add(&last_status_dump, &delay, &tmp);
        if (tv_diff(&tmp, now, NULL) < 0) {
                audiod_status_dump();
                last_status_dump = *now;
        }
 
-       if (!FD_ISSET(ct->fd, &s->rfds))
-               return;
-       ret = handle_connect(ct->fd);
+       ret = handle_connect(ct->fd, &s->rfds);
        if (ret < 0)
                PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+       audiod_status_dump();
 }
 
 static void init_command_task(struct command_task *ct)
@@ -931,12 +1051,14 @@ static void close_stat_pipe(void)
 {
        if (!stat_task->ct)
                return;
+       btr_free_node(stat_task->ct->btrn);
        client_close(stat_task->ct);
        stat_task->ct = NULL;
        clear_and_dump_items();
        stat_task->length_seconds = 0;
        stat_task->offset_seconds = 0;
        stat_task->vss_status = 0;
+       stat_task->current_audio_format_num = -1;
        audiod_status_dump();
 }
 
@@ -971,19 +1093,27 @@ static void set_stat_task_restart_barrier(unsigned seconds)
 static void try_to_close_slot(int slot_num)
 {
        struct slot_info *s = &slot[slot_num];
+       struct audio_format_info *a = afi + s->format;
+       int i;
 
        if (s->format < 0)
                return;
        if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
                return;
-       if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
-               return;
-       if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
-               return;
+       for (i = 0; i < a->num_filters; i++)
+               if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
+                       return;
+       if (a->num_writers > 0) {
+               for (i = 0; i < a->num_writers; i++)
+                       if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
+                               return;
+       } else {
+               if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
+                       return;
+       }
        PARA_INFO_LOG("closing slot %d\n", slot_num);
-       wng_close(s->wng);
-       close_filters(s->fc);
-       free(s->fc);
+       close_writers(s);
+       close_filters(s);
        close_receiver(slot_num);
        clear_slot(slot_num);
 }
@@ -992,54 +1122,63 @@ static void try_to_close_slot(int slot_num)
  * Check if any receivers/filters/writers need to be started and do so if
  * necessary.
  */
-static void start_stop_decoders(struct sched *s)
+static void start_stop_decoders(void)
 {
-       int i;
+       int i, ret;
+       struct slot_info *sl;
+       struct audio_format_info *a;
 
        FOR_EACH_SLOT(i)
                try_to_close_slot(i);
        if (audiod_status != AUDIOD_ON ||
                        !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
                return kill_all_decoders(-E_NOT_PLAYING);
-       open_current_receiver(s);
-       FOR_EACH_SLOT(i) {
-               struct slot_info *sl = &slot[i];
-               struct audio_format_info *a;
-               struct timeval diff;
-
-               if (sl->format < 0)
-                       continue;
-               a = &afi[sl->format];
-               if (!sl->receiver_node)
-                       continue;
-               if ((!a->num_filters || sl->fc) && sl->wng)
-                       continue; /* everything already started */
-               if (!a->num_filters) {
-                       if (sl->receiver_node->loaded && !sl->wng) {
-                               open_writers(i);
-                       }
-                       continue;
-               }
-               if (sl->receiver_node->loaded && !sl->fc) {
-                       open_filters(i);
-                       continue;
-               }
-               if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
-                       continue;
-               if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
-                       open_writers(i);
-                       continue;
-               }
-               PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
-               if (tv_diff(&s->timeout, &diff, NULL) > 0) {
-                       s->timeout = diff;
-               }
+       if (!must_start_decoder())
+               return;
+       ret = open_receiver(stat_task->current_audio_format_num);
+       if (ret < 0) {
+               PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+               return;
        }
+       sl = slot + ret;
+       a = afi + sl->format;
+       if (a->num_filters)
+               open_filters(sl);
+       open_writers(sl);
+       activate_grab_clients();
+       btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
 }
 
+static void status_pre_select(struct sched *s, struct task *t)
+{
+       struct status_task *st = container_of(t, struct status_task, task);
+       int ret, cafn = stat_task->current_audio_format_num;
+
+       if (must_start_decoder())
+               goto min_delay;
+       ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
+       if (ret > 0)
+               goto min_delay;
+       if (st->ct && audiod_status == AUDIOD_OFF)
+               goto min_delay;
+       if (!st->ct && audiod_status != AUDIOD_OFF)
+               sched_request_barrier_or_min_delay(&st->restart_barrier, s);
+       if (cafn >= 0)
+               sched_request_barrier(&afi[cafn].restart_barrier, s);
+       /*
+        * If para_server is playing we'd like to have a smooth time display
+        * even if we are running in standby mode. So we request a timeout that
+        * expires at the next full second.
+        */
+       if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
+               sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
+       return;
+min_delay:
+       sched_min_delay(s);
+}
 
 /* restart the client task if necessary */
-static void status_pre_select(struct sched *s, struct task *t)
+static void status_post_select(__a_unused struct sched *s, struct task *t)
 {
        struct status_task *st = container_of(t, struct status_task, task);
 
@@ -1047,7 +1186,7 @@ static void status_pre_select(struct sched *s, struct task *t)
                if (!st->ct)
                        goto out;
                if (st->ct->task.error >= 0) {
-                       st->ct->task.error = -E_AUDIOD_OFF;
+                       kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
                        goto out;
                }
                if (st->ct->task.error != -E_TASK_UNREGISTERED)
@@ -1057,6 +1196,8 @@ static void status_pre_select(struct sched *s, struct task *t)
                goto out;
        }
        if (st->ct) {
+               char *buf;
+               size_t sz;
                int ret;
                if (st->ct->task.error < 0) {
                        if (st->ct->task.error != -E_TASK_UNREGISTERED)
@@ -1066,37 +1207,46 @@ static void status_pre_select(struct sched *s, struct task *t)
                }
                if (st->ct->status != CL_RECEIVING)
                        goto out;
-               ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
-                       update_item);
-               if (ret < 0) {
-                       st->ct->task.error = ret;
-                       goto out;
-               }
-               if (st->ct->loaded != ret) {
-                       st->last_status_read = *now;
-                       st->ct->loaded = ret;
-               } else {
+               ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
+               if (ret <= 0) {
                        struct timeval diff;
                        tv_diff(now, &st->last_status_read, &diff);
                        if (diff.tv_sec > 61)
-                               st->ct->task.error = -E_STATUS_TIMEOUT;
+                               kill_btrn(st->ct->btrn, &st->ct->task,
+                                       -E_STATUS_TIMEOUT);
+                       goto out;
                }
+               btr_merge(st->btrn, st->min_iqs);
+               sz = btr_next_buffer(st->btrn, &buf);
+               ret = for_each_stat_item(buf, sz, update_item);
+               if (ret < 0) {
+                       kill_btrn(st->ct->btrn, &st->ct->task, ret);
+                       goto out;
+               }
+               if (sz != ret) {
+                       btr_consume(st->btrn, sz - ret);
+                       st->last_status_read = *now;
+                       st->min_iqs = 0;
+               } else /* current status item crosses buffers */
+                       st->min_iqs = sz + 1;
                goto out;
        }
+       btr_drain(st->btrn);
+       st->current_audio_format_num = -1;
        if (tv_diff(now, &st->restart_barrier, NULL) < 0)
                goto out;
        if (st->clock_diff_count) { /* get status only one time */
-               char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
+               char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
                int argc = 5;
                PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
                st->clock_diff_count--;
-               client_open(argc, argv, &st->ct, NULL);
+               client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
                set_stat_task_restart_barrier(2);
 
        } else {
                char *argv[] = {"audiod", "--", "stat", "-p", NULL};
                int argc = 4;
-               client_open(argc, argv, &st->ct, NULL);
+               client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
                set_stat_task_restart_barrier(5);
        }
        free(stat_item_values[SI_BASENAME]);
@@ -1105,17 +1255,20 @@ static void status_pre_select(struct sched *s, struct task *t)
        stat_client_write_item(SI_BASENAME);
        st->last_status_read = *now;
 out:
-       start_stop_decoders(s);
+       start_stop_decoders();
 }
 
 static void init_status_task(struct status_task *st)
 {
        memset(st, 0, sizeof(struct status_task));
        st->task.pre_select = status_pre_select;
+       st->task.post_select = status_post_select;
        st->sa_time_diff_sign = 1;
        st->clock_diff_count = conf.clock_diff_count_arg;
        st->current_audio_format_num = -1;
-       sprintf(st->task.status, "status task");
+       sprintf(st->task.status, "stat");
+       st->btrn = btr_new_node(&(struct btr_node_description)
+               EMBRACE(.name = "stat"));
 }
 
 static void set_initial_status(void)
@@ -1154,17 +1307,14 @@ __noreturn static void print_help_and_die(void)
 
 static void init_colors_or_die(void)
 {
-       int ret, i;
+       int i;
 
        if (!want_colors())
                return;
        daemon_set_default_log_colors();
        daemon_set_flag(DF_COLOR_LOG);
-       for (i = 0; i < conf.log_color_given; i++) {
-               ret = daemon_set_log_color(conf.log_color_arg[i]);
-               if (ret < 0)
-                       exit(EXIT_FAILURE);
-       }
+       for (i = 0; i < conf.log_color_given; i++)
+               daemon_set_log_color_or_die(conf.log_color_arg[i]);
 }
 
 /**
@@ -1207,6 +1357,8 @@ int main(int argc, char *argv[])
        daemon_set_flag(DF_LOG_TIME);
        daemon_set_flag(DF_LOG_HOSTNAME);
        daemon_set_flag(DF_LOG_LL);
+       if (conf.log_timing_given)
+               daemon_set_flag(DF_LOG_TIMING);
        if (conf.logfile_given) {
                daemon_set_logfile(conf.logfile_arg);
                daemon_open_log_or_die();
@@ -1221,7 +1373,6 @@ int main(int argc, char *argv[])
        set_initial_status();
        FOR_EACH_SLOT(i)
                clear_slot(i);
-       init_grabbing();
        setup_signal_handling();
        signal_setup_default(sig_task);
 
@@ -1234,7 +1385,7 @@ int main(int argc, char *argv[])
        register_task(&sig_task->task);
        register_task(&cmd_task->task);
        register_task(&stat_task->task);
-       s.default_timeout.tv_sec = 0;
+       s.default_timeout.tv_sec = 2;
        s.default_timeout.tv_usec = 999 * 1000;
        ret = schedule(&s);