X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=audiod.c;h=29a8aa30abec6be72aee946b92d7767f3fc037e5;hp=bde2b1e1299a51548b727c13c2d32df760067fda;hb=672e27768e31a6eaa6854d4fc75ee6885db9abd8;hpb=335730538150250f32c0df0b184fb494e2bb0df3

diff --git a/audiod.c b/audiod.c
index bde2b1e1..29a8aa30 100644
--- a/audiod.c
+++ b/audiod.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -7,15 +7,18 @@
 /** \file audiod.c the paraslash's audio daemon */
 #include <sys/types.h>
 #include <dirent.h>
+#include <signal.h>
+#include <openssl/rc4.h>
 
 #include "para.h"
 #include "error.h"
+#include "crypt.h"
 #include "audiod.cmdline.h"
 #include "list.h"
 #include "sched.h"
+#include "ggo.h"
 #include "recv.h"
 #include "filter.h"
-#include "grab_client.cmdline.h"
 #include "grab_client.h"
 #include "client.cmdline.h"
 #include "client.h"
@@ -41,14 +44,14 @@ struct audio_format_info {
 	void *receiver_conf;
 	/** the number of filters that should be activated for this audio format */
 	unsigned int num_filters;
-	/** pointer to the array of filters to be activated */
-	struct filter **filters;
-	/** pointer to the array of filter configurations */
+	/** Array of filter numbers to be activated. */
+	unsigned *filter_nums;
+	/** Pointer to the array of filter configurations. */
 	void **filter_conf;
 	/** the number of filters that should be activated for this audio format */
 	unsigned int num_writers;
-	/** pointer to the array of writers to be activated */
-	struct writer **writers;
+	/** Array of writer numbers to be activated. */
+	int *writer_nums;
 	/** pointer to the array of writer configurations */
 	void **writer_conf;
 	/** do not start receiver/filters/writer before this time */
@@ -64,6 +67,50 @@ struct audio_format_info {
  * */
 struct slot_info slot[MAX_STREAM_SLOTS];
 
+/** The vss status flags audiod is interested in. */
+enum vss_status_flags {
+	/** Whether the 'N' flag is set. */
+	VSS_STATUS_FLAG_NEXT = 1,
+	/** The 'P' flag is set. */
+	VSS_STATUS_FLAG_PLAYING = 2,
+};
+
+/**
+ * The task for obtaining para_server's status (para_client stat).
+ *
+ * \sa struct task, struct sched.
+ */
+struct status_task {
+	/** The associated task structure of audiod. */
+	struct task task;
+	/** Client data associated with the stat task. */
+	struct client_task *ct;
+	/** Do not restart client command until this time. */
+	struct timeval restart_barrier;
+	/** Last time we received status data from para_server. */
+	struct timeval last_status_read;
+	/** The offset value announced by para_server. */
+	int offset_seconds;
+	/** The length of the current audio file as announced by para_server. */
+	int length_seconds;
+	/** The start of the current stream from the view of para_server. */
+	struct timeval server_stream_start;
+	/** The average time deviation between para_server and para_audiod. */
+	struct timeval sa_time_diff;
+	/** Whether client time is ahead of server time. */
+	int sa_time_diff_sign;
+	/** The 'P' and the 'N' flags as announced by para_server. */
+	enum vss_status_flags vss_status;
+	/** Number of times the clock difference is to be checked. */
+	unsigned clock_diff_count;
+	/** When to start the next check for clock difference. */
+	struct timeval clock_diff_barrier;
+	/** Number of the audio format as announced by para_server. */
+	int current_audio_format_num;
+};
+
+/** The array of status items sent by para_server. */
+char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 
 /**
  * the current mode of operation of which can be changed by the on/off/cycle
@@ -78,7 +125,6 @@ int audiod_status = AUDIOD_ON;
 struct audiod_args_info conf;
 
 static char *socket_name;
-static FILE *logfile;
 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 
 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
@@ -90,7 +136,7 @@ static struct status_task status_task_struct;
  *
  * \sa struct status_task
  */
-struct status_task *stat_task = &status_task_struct;
+static struct status_task *stat_task = &status_task_struct;
 static struct timeval initial_delay_barrier;
 
 /**
@@ -115,7 +161,7 @@ struct command_task {
  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
  * \a name is not a supported audio format.
  */
-int get_audio_format_num(char *name)
+int get_audio_format_num(const char *name)
 {
 	int i;
 
@@ -127,49 +173,110 @@ int get_audio_format_num(char *name)
 	return -E_UNSUPPORTED_AUDIO_FORMAT;
 }
 
-/**
- * the log function of para_audiod
- *
- * \param ll loglevel
- * \param fmt the format string
- */
-void para_log(int ll, const char* fmt,...)
+char *get_time_string(int slot_num)
 {
-	va_list argp;
-	FILE *outfd;
-	struct tm *tm;
-	time_t t1;
-	char str[MAXLINE] = "";
-	static char *hostname;
-
-	if (ll < conf.loglevel_arg)
-		return;
-	if (!logfile && conf.daemon_given)
-		return;
-	if (!hostname)
-		hostname = para_hostname();
-	outfd = logfile? logfile : stderr;
-	time(&t1);
-	tm = localtime(&t1);
-	strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
-	fprintf(outfd, "%s %s ", str, hostname);
-	if (conf.loglevel_arg <= INFO)
-		fprintf(outfd, "%i ", ll);
-	va_start(argp, fmt);
-	vfprintf(outfd, fmt, argp);
-	va_end(argp);
+	int ret, seconds = 0, length;
+	struct timeval *tmp, sum, sss, /* server stream start */
+		wtime, /* now - writer start */
+		rskip; /* receiver start - sss */
+	struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
+
+	if (audiod_status == AUDIOD_OFF)
+		goto empty;
+	if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
+		if (stat_task->length_seconds) /* paused */
+			return NULL;
+		goto empty; /* stopped */
+	}
+	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;
+	}
+	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) {
+		struct timeval diff;
+		tv_diff(now, &sss, &diff);
+		seconds = diff.tv_sec + stat_task->offset_seconds;
+		goto out;
+	}
+	tv_diff(now, &s->wstime, &wtime);
+	seconds = s->offset_seconds;
+	ret = tv_diff(&s->rstime, &sss, &rskip);
+	if (ret > 0) { /* audiod was started in the middle of the stream */
+		tv_add(&wtime, &rskip, &sum);
+		seconds += sum.tv_sec;
+	} else
+		seconds += wtime.tv_sec;
+out:
+	seconds = PARA_MIN(seconds, length);
+	seconds = PARA_MAX(seconds, 0);
+	return make_message(
+		"%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
+		s? "" : "~",
+		seconds / 60,
+		seconds % 60,
+		(length - seconds) / 60,
+		(length - seconds) % 60,
+		length? (seconds * 100 + length / 2) / length : 0,
+		length / 60,
+		length % 60
+	);
+empty:
+	return para_strdup(NULL);
+}
+
+static int want_colors(void)
+{
+	if (conf.color_arg == color_arg_no)
+		return 0;
+	if (conf.color_arg == color_arg_yes)
+		return 1;
+	if (conf.logfile_given)
+		return 0;
+	return isatty(STDERR_FILENO);
 }
 
-static char *configfile_exists(void)
+static void parse_config_or_die(void)
 {
-	char *home = para_homedir();
-	char *config_file = make_message("%s/.paraslash/audiod.conf",
-		home);
-	free(home);
-	if (file_exists(config_file))
-		return config_file;
+	int ret;
+	char *config_file;
+	struct audiod_cmdline_parser_params params = {
+		.override = 0,
+		.initialize = 0,
+		.check_required = 1,
+		.check_ambiguity = 0,
+		.print_errors = 1
+	};
+
+	if (conf.config_file_given)
+		config_file = para_strdup(conf.config_file_arg);
+	else {
+		char *home = para_homedir();
+		config_file = make_message("%s/.paraslash/audiod.conf", home);
+		free(home);
+	}
+	ret = file_exists(config_file);
+	if (conf.config_file_given && !ret) {
+		PARA_EMERG_LOG("can not read config file %s\n", config_file);
+		goto err;
+	}
+	if (ret)
+		audiod_cmdline_parser_config_file(config_file, &conf, &params);
+	free(config_file);
+	daemon_set_loglevel(conf.loglevel_arg);
+	return;
+err:
 	free(config_file);
-	return NULL;
+	exit(EXIT_FAILURE);
 }
 
 static void setup_signal_handling(void)
@@ -179,7 +286,7 @@ static void setup_signal_handling(void)
 	para_install_sighandler(SIGINT);
 	para_install_sighandler(SIGTERM);
 	para_install_sighandler(SIGHUP);
-	signal(SIGPIPE, SIG_IGN);
+	para_sigaction(SIGPIPE, SIG_IGN);
 }
 
 static void clear_slot(int slot_num)
@@ -212,20 +319,17 @@ static void kill_all_decoders(int error)
 
 	FOR_EACH_SLOT(i) {
 		struct slot_info *s = &slot[i];
-		if (s->wng && !s->wng->task.error) {
-			PARA_INFO_LOG("unregistering writer node group in slot %d\n",
+		if (s->wng && s->wng->task.error >= 0) {
+			PARA_INFO_LOG("deactivating wng in slot %d\n",
 				i);
-			wng_unregister(s->wng);
 			s->wng->task.error = error;
 		}
-		if (s->fc && !s->fc->task.error) {
-			PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
-			unregister_task(&s->fc->task);
+		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) {
-			PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
-			unregister_task(&s->receiver_node->task);
+		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;
 		}
 	}
@@ -268,6 +372,7 @@ static void open_filters(int slot_num)
 {
 	struct slot_info *s = &slot[slot_num];
 	struct audio_format_info *a = &afi[s->format];
+	struct filter_node *fn;
 	int nf = a->num_filters;
 	int i;
 
@@ -276,27 +381,28 @@ static void open_filters(int slot_num)
 		return;
 	PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 	s->fc = para_calloc(sizeof(struct filter_chain));
-	INIT_LIST_HEAD(&s->fc->filters);
-	s->fc->inbuf = s->receiver_node->buf;
+	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 = filter_pre_select;
+	s->fc->task.post_select = NULL;
 	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 (i = 0; i < nf; i++) {
-		struct filter_node *fn = para_calloc(sizeof(struct filter_node));
+	FOR_EACH_FILTER_NODE(fn, s->fc, i) {
+		struct filter *f = filters + a->filter_nums[i];
+		fn->filter_num = a->filter_nums[i];
 		fn->conf = a->filter_conf[i];
 		fn->fc = s->fc;
-		fn->filter = a->filters[i];
+		fn->loaded = 0;
 		INIT_LIST_HEAD(&fn->callbacks);
-		list_add_tail(&fn->node, &s->fc->filters);
-		fn->filter->open(fn);
+		f->open(fn);
 		PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
-			audio_formats[s->format], i + 1,  nf,
-			fn->filter->name, slot_num);
-		s->fc->outbuf = fn->buf;
+			audio_formats[s->format], i,  nf, f->name, slot_num);
+		s->fc->outbufp = &fn->buf;
 		s->fc->out_loaded = &fn->loaded;
 	}
 	register_task(&s->fc->task);
@@ -314,7 +420,7 @@ static void open_writers(int slot_num)
 	else
 		s->wng = wng_new(a->num_writers);
 	if (s->fc) {
-		s->wng->buf = s->fc->outbuf;
+		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;
@@ -322,52 +428,32 @@ static void open_writers(int slot_num)
 		s->fc->output_error = &s->wng->task.error;
 		PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 	} else {
-		s->wng->buf = s->receiver_node->buf;
+		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 = a->writers[i];
+		s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
 	}
 	ret = wng_open(s->wng);
-	if (ret < 0) {
-		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	if (ret < 0)
 		return;
-	}
 	s->wstime = *now;
-	activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
+	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);
 }
 
-#if 0
-static void rn_event_handler(struct task *t)
-{
-	struct receiver_node *rn = t->private_data;
-	int i;
-
-	PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
-	unregister_task(t);
-	rn->error = t->ret;
-	/* set restart barrier */
-	FOR_EACH_SLOT(i) {
-		struct timeval restart_delay = {0, 10 * 1000};
-		if (slot[i].receiver_node != rn)
-			continue;
-		if (rn->error != -E_RECV_EOF)
-			/* don't reconnect immediately on errors */
-			restart_delay.tv_sec = 5;
-		tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
-	}
-}
-#endif
-
 static int open_receiver(int format)
 {
 	struct audio_format_info *a = &afi[format];
 	struct slot_info *s;
 	int ret, slot_num;
 	struct receiver_node *rn;
-	const struct timeval restart_delay = {1, 0};
+	const struct timeval restart_delay = {2, 0};
 
 	ret = get_empty_slot();
 	if (ret < 0)
@@ -389,42 +475,65 @@ static int open_receiver(int format)
 		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);
 	register_task(&rn->task);
-	return 1;
+	ret = 1;
 err:
-	PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	if (ret < 0)
+		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 	tv_add(now, &restart_delay, &afi[format].restart_barrier);
 	return ret;
 }
 
+/* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 static int receiver_running(int format)
 {
-	int i;
+	int i, ret = 0;
 
 	FOR_EACH_SLOT(i) {
 		struct slot_info *s = &slot[i];
-		if (s->format == format && s->receiver_node
-				&& s->receiver_node->task.error >= 0)
+		if (s->format != format)
+			continue;
+		if (!s->receiver_node)
+			continue;
+		if (s->receiver_node->task.error >= 0)
 			return 1;
+		ret = -1;
 	}
-	return 0;
+	return ret;
 }
 
-static int open_current_receiver(struct sched *s)
+static void open_current_receiver(struct sched *s)
 {
 	struct timeval diff;
-	int cafn = stat_task->current_audio_format_num;
+	int ret, cafn = stat_task->current_audio_format_num;
 
 	if (cafn < 0 || !stat_task->ct)
-		return 0;
-	if (receiver_running(cafn))
-		return 0;
+		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 0;
+		return;
 	}
-	return open_receiver(cafn) < 0? 0 : 1;
+	/* start a new receiver */
+	open_receiver(cafn);
 }
 
 static unsigned compute_time_diff(const struct timeval *status_time)
@@ -469,42 +578,31 @@ out:
 	return count;
 }
 
-static int check_stat_line(char *line, __a_unused void *data)
+static int update_item(int itemnum, char *buf)
 {
-	int itemnum;
-	size_t ilen = 0;
 	long unsigned sec, usec;
-	char *tmp;
 
-	//PARA_INFO_LOG("line: %s\n", line);
-	if (!line)
-		return 1;
-	itemnum = stat_line_valid(line);
-	if (itemnum < 0) {
-		PARA_WARNING_LOG("invalid status line: %s\n", line);
-		return 1;
-	}
 	if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 		return 1;
-	tmp = make_message("%s\n", line);
-	stat_client_write(tmp, itemnum);
-	free(tmp);
-	free(stat_task->stat_item_values[itemnum]);
-	stat_task->stat_item_values[itemnum] = para_strdup(line);
-	ilen = strlen(status_item_list[itemnum]);
+	free(stat_item_values[itemnum]);
+	stat_item_values[itemnum] = para_strdup(buf);
+	stat_client_write_item(itemnum);
 	switch (itemnum) {
-	case SI_STATUS:
-		stat_task->playing = strstr(line, "playing")? 1 : 0;
-		PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
+	case SI_STATUS_FLAGS:
+		stat_task->vss_status = 0;
+		if (strchr(buf, 'N'))
+			stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
+		if (strchr(buf, 'P'))
+			stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 		break;
 	case SI_OFFSET:
-		stat_task->offset_seconds = atoi(line + ilen + 1);
+		stat_task->offset_seconds = atoi(buf);
 		break;
 	case SI_SECONDS_TOTAL:
-		stat_task->length_seconds = atoi(line + ilen + 1);
+		stat_task->length_seconds = atoi(buf);
 		break;
 	case SI_STREAM_START:
-		if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
+		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;
@@ -522,110 +620,18 @@ static int check_stat_line(char *line, __a_unused void *data)
 		}
 		break;
 	case SI_CURRENT_TIME:
-		if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
+		if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 			struct timeval tv = {sec, usec};
 			compute_time_diff(&tv);
 		}
-		if (stat_task->clock_diff_count)
-			stat_task->clock_diff_count--;
 		break;
 	case SI_FORMAT:
-		stat_task->current_audio_format_num = get_audio_format_num(
-			line + ilen + 1);
+		stat_task->current_audio_format_num
+			= get_audio_format_num(buf);
 	}
 	return 1;
 }
 
-static void try_to_close_slot(int slot_num)
-{
-	struct slot_info *s = &slot[slot_num];
-
-	if (s->format < 0)
-		return;
-	if (s->receiver_node && s->receiver_node->task.error >= 0)
-		return;
-	if (s->fc && s->fc->task.error >= 0)
-		return;
-	if (s->wng && s->wng->task.error >= 0)
-		return;
-	PARA_INFO_LOG("closing slot %d\n", slot_num);
-	wng_close(s->wng);
-	close_filters(s->fc);
-	free(s->fc);
-	close_receiver(slot_num);
-	clear_slot(slot_num);
-}
-
-/*
- * Check if any receivers/filters/writers need to be started and do so if
- * necessary.  Since the pre_select function didn't have a chance yet to put
- * file descriptors into the fd sets given by s, make the upcoming select()
- * return immediately to avoid a long timeout in case we started something.
- */
-static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
-{
-	int i;
-	struct timeval min_delay = {0, 1};
-
-	if (audiod_status != AUDIOD_ON || !stat_task->playing)
-		return kill_all_decoders(-E_NOT_PLAYING);
-	if (open_current_receiver(s))
-		s->timeout = min_delay;
-	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);
-				s->timeout = min_delay;
-			}
-			continue;
-		}
-		if (sl->receiver_node->loaded && !sl->fc) {
-			open_filters(i);
-			s->timeout = min_delay;
-			continue;
-		}
-		if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
-			continue;
-		if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
-			open_writers(i);
-			s->timeout = min_delay;
-			continue;
-		}
-		PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
-		if (tv_diff(&s->timeout, &diff, NULL) > 0) {
-			s->timeout = diff;
-		}
-	}
-}
-
-static void audiod_post_select(__a_unused struct sched *s,
-	__a_unused struct task *t)
-{
-	int i;
-
-	FOR_EACH_SLOT(i)
-		try_to_close_slot(i);
-}
-
-static void init_audiod_task(struct task *t)
-{
-	t->pre_select = audiod_pre_select;
-	t->post_select = audiod_post_select;
-	t->error = 0;
-	sprintf(t->status, "audiod task");
-}
-
 static int parse_stream_command(const char *txt, char **cmd)
 {
 	char *p = strchr(txt, ':');
@@ -651,26 +657,25 @@ static int add_filter(int format, char *cmdline)
 	filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 	if (filter_num < 0)
 		return filter_num;
-	a->filters[nf] = &filters[filter_num];
+	a->filter_nums[nf] = filter_num;
 	a->num_filters++;
-	PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
-		a->filters[nf]->name);
+	PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
+		filters[filter_num].name);
 	return filter_num;
 }
 
-static int init_writers(void)
+static int parse_writer_args(void)
 {
 	int i, ret, nw;
 	char *cmd;
 	struct audio_format_info *a;
 
-	init_supported_writers();
-	nw = PARA_MAX(1, conf.writer_given);
+	nw = PARA_MAX(1U, conf.writer_given);
 	PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 	FOR_EACH_AUDIO_FORMAT(i) {
 		a = &afi[i];
 		a->writer_conf = para_malloc(nw * sizeof(void *));
-		a->writers = para_malloc(nw * sizeof(struct writer *));
+		a->writer_nums = para_malloc(nw * sizeof(int));
 		a->num_writers = 0;
 	}
 	for (i = 0; i < conf.writer_given; i++) {
@@ -686,7 +691,7 @@ static int init_writers(void)
 			ret = writer_num;
 			goto out;
 		}
-		a->writers[nw] = &writers[writer_num];
+		a->writer_nums[nw] = writer_num;
 		a->writer_conf[nw] = wconf;
 		PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 			nw, writer_names[writer_num]);
@@ -697,16 +702,12 @@ out:
 	return ret;
 }
 
-static int init_receivers(void)
+static int parse_receiver_args(void)
 {
 	int i, ret, receiver_num;
 	char *cmd = NULL;
 	struct audio_format_info *a;
 
-	for (i = 0; receivers[i].name; i++) {
-		PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
-		receivers[i].init(&receivers[i]);
-	}
 	for (i = conf.receiver_given - 1; i >= 0; i--) {
 		char *arg = conf.receiver_arg[i];
 		char *recv_arg = strchr(arg, ':');
@@ -777,16 +778,15 @@ out:
 	return ret;
 }
 
-static int init_filters(void)
+static int parse_filter_args(void)
 {
 	int i, ret, nf;
 
-	filter_init(filters);
-	nf = PARA_MAX(1,  conf.filter_given);
+	nf = PARA_MAX(1U, 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 *));
-		afi[i].filters = para_malloc(nf * sizeof(struct filter *));
+		afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 	}
 	if (!conf.no_default_filters_given)
 		return init_default_filters();
@@ -810,17 +810,17 @@ out:
 	return ret;
 }
 
-static int init_stream_io(void)
+static int parse_stream_args(void)
 {
 	int ret;
 
-	ret = init_writers();
+	ret = parse_receiver_args();
 	if (ret < 0)
 		return ret;
-	ret = init_receivers();
+	ret = parse_filter_args();
 	if (ret < 0)
 		return ret;
-	ret = init_filters();
+	ret = parse_writer_args();
 	if (ret < 0)
 		return ret;
 	return 1;
@@ -870,13 +870,12 @@ static void signal_pre_select(struct sched *s, struct task *t)
 static void signal_post_select(struct sched *s, struct task *t)
 {
 	struct signal_task *st = container_of(t, struct signal_task, task);
-	int signum;
 
 	if (!FD_ISSET(st->fd, &s->rfds))
 		return;
 
-	signum = para_next_signal();
-	switch (signum) {
+	st->signum = para_next_signal();
+	switch (st->signum) {
 	case SIGINT:
 	case SIGTERM:
 	case SIGHUP:
@@ -922,30 +921,15 @@ static void init_command_task(struct command_task *ct)
 
 static void close_stat_pipe(void)
 {
-	int i;
-
 	if (!stat_task->ct)
 		return;
 	client_close(stat_task->ct);
 	stat_task->ct = NULL;
-	FOR_EACH_STATUS_ITEM(i) {
-		free(stat_task->stat_item_values[i]);
-		stat_task->stat_item_values[i] = NULL;
-	}
-	dump_empty_status();
+	clear_and_dump_items();
 	stat_task->length_seconds = 0;
 	stat_task->offset_seconds = 0;
+	stat_task->vss_status = 0;
 	audiod_status_dump();
-	stat_task->playing = 0;
-	stat_task->stat_item_values[SI_BASENAME] = make_message(
-		"%s: no connection to para_server\n",
-		status_item_list[SI_BASENAME]);
-	stat_client_write(stat_task->stat_item_values[SI_BASENAME],
-		SI_BASENAME);
-	if (stat_task->clock_diff_count) {
-		stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
-		stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
-	}
 }
 
 /**
@@ -970,90 +954,156 @@ void __noreturn clean_exit(int status, const char *msg)
 }
 
 /* avoid busy loop if server is down */
-static void set_stat_task_restart_barrier(void)
+static void set_stat_task_restart_barrier(unsigned seconds)
 {
-	struct timeval delay = {5, 0};
+	struct timeval delay = {seconds, 0};
 	tv_add(now, &delay, &stat_task->restart_barrier);
 }
 
-#if 0
-static void client_task_event_handler(__a_unused struct task *t)
+static void try_to_close_slot(int slot_num)
 {
-	int i;
+	struct slot_info *s = &slot[slot_num];
 
-	if (t->ret == -E_HANDSHAKE_COMPLETE)
+	if (s->format < 0)
 		return;
-	unregister_task(t);
-	close_stat_pipe();
-	if (t->ret != -E_SERVER_EOF)
-		stat_task->clock_diff_count = conf.clock_diff_count_arg;
-	set_stat_task_restart_barrier();
-	FOR_EACH_AUDIO_FORMAT(i)
-		afi[i].restart_barrier = stat_task->restart_barrier;
+	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;
+	PARA_INFO_LOG("closing slot %d\n", slot_num);
+	wng_close(s->wng);
+	close_filters(s->fc);
+	free(s->fc);
+	close_receiver(slot_num);
+	clear_slot(slot_num);
 }
-#endif
 
-static void status_pre_select(struct sched *s, struct task *t)
+/*
+ * Check if any receivers/filters/writers need to be started and do so if
+ * necessary.
+ */
+static void start_stop_decoders(struct sched *s)
 {
-	struct status_task *st = container_of(t, struct status_task, task);
-	int ret;
+	int i;
 
-	if (st->ct || audiod_status == AUDIOD_OFF)
-		return;
-	if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
-			< 0)
-		return;
-	if (st->clock_diff_count) {
-		char *argv[] = {"audiod", "stat", "1", NULL};
-		int argc = 3;
-		if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
-			return;
-		PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
-		ret = client_open(argc, argv, &st->ct);
+	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;
 
-	} else {
-		char *argv[] = {"audiod", "stat", NULL};
-		int argc = 2;
-		ret = client_open(argc, argv, &st->ct);
+		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;
+		}
 	}
-	set_stat_task_restart_barrier();
-	if (ret < 0)
-		return;
-	s->timeout.tv_sec = 0;
-	s->timeout.tv_usec = 1;
 }
 
-static void status_post_select(__a_unused struct sched *s, struct task *t)
+
+/* restart the client task if necessary */
+static void status_pre_select(struct sched *s, struct task *t)
 {
 	struct status_task *st = container_of(t, struct status_task, task);
-	unsigned bytes_left;
 
-	if (!st->ct || st->ct->status != CL_RECEIVING)
-		return;
-	if (st->ct && audiod_status == AUDIOD_OFF) {
-		unregister_task(&st->ct->task);
+	if (audiod_status == AUDIOD_OFF) {
+		if (!st->ct)
+			goto out;
+		if (st->ct->task.error >= 0) {
+			st->ct->task.error = -E_AUDIOD_OFF;
+			goto out;
+		}
+		if (st->ct->task.error != -E_TASK_UNREGISTERED)
+			goto out;
 		close_stat_pipe();
 		st->clock_diff_count = conf.clock_diff_count_arg;
-		return;
+		goto out;
 	}
-	bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
-		&check_stat_line, NULL);
-	if (st->ct->loaded != bytes_left) {
-		st->last_status_read = *now;
-		st->ct->loaded = bytes_left;
-	} else {
-		struct timeval diff;
-		tv_diff(now, &st->last_status_read, &diff);
-		if (diff.tv_sec > 61)
+	if (st->ct) {
+		int ret;
+		if (st->ct->task.error < 0) {
+			if (st->ct->task.error != -E_TASK_UNREGISTERED)
+				goto out;
 			close_stat_pipe();
+			goto out;
+		}
+		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 {
+			struct timeval diff;
+			tv_diff(now, &st->last_status_read, &diff);
+			if (diff.tv_sec > 61)
+				st->ct->task.error = -E_STATUS_TIMEOUT;
+		}
+		goto out;
+	}
+	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};
+		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);
+		set_stat_task_restart_barrier(2);
+
+	} else {
+		char *argv[] = {"audiod", "--", "stat", "-p", NULL};
+		int argc = 4;
+		client_open(argc, argv, &st->ct, NULL);
+		set_stat_task_restart_barrier(5);
 	}
+	free(stat_item_values[SI_BASENAME]);
+	stat_item_values[SI_BASENAME] = para_strdup(
+		"no connection to para_server");
+	stat_client_write_item(SI_BASENAME);
+	st->last_status_read = *now;
+out:
+	start_stop_decoders(s);
 }
 
 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;
@@ -1077,6 +1127,38 @@ static void set_initial_status(void)
 		PARA_WARNING_LOG("invalid mode\n");
 }
 
+__noreturn static void print_help_and_die(void)
+{
+	int d = conf.detailed_help_given;
+	const char **p = d? audiod_args_info_detailed_help
+		: audiod_args_info_help;
+
+	printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
+		AUDIOD_CMDLINE_PARSER_VERSION);
+	printf_or_die("%s\n\n", audiod_args_info_usage);
+	for (; *p; p++)
+		printf_or_die("%s\n", *p);
+	print_receiver_helps(d);
+	print_filter_helps(d);
+	print_writer_helps(d);
+	exit(0);
+}
+
+static void init_colors_or_die(void)
+{
+	int ret, 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);
+	}
+}
+
 /**
  * the main function of para_audiod
  *
@@ -1089,39 +1171,43 @@ static void set_initial_status(void)
  * */
 int main(int argc, char *argv[])
 {
-	char *config_file;
 	int ret, i;
-	struct sched s;
+	static struct sched s;
 	struct command_task command_task_struct, *cmd_task = &command_task_struct;
-	struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
+	struct audiod_cmdline_parser_params params = {
+		.override = 0,
+		.initialize = 1,
+		.check_required = 0,
+		.check_ambiguity = 0,
+		.print_errors = 1
+	};
 
 	valid_fd_012();
-	audiod_cmdline_parser(argc, argv, &conf);
+	if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
+		exit(EXIT_FAILURE);
 	HANDLE_VERSION_FLAG("audiod", conf);
-	para_drop_privileges(conf.user_arg, conf.group_arg);
-	config_file = configfile_exists();
-	if (config_file) {
-		struct audiod_cmdline_parser_params params = {
-			.override = 0,
-			.initialize = 0,
-			.check_required = 0,
-			.check_ambiguity = 0
-
-		};
-		if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
-			PARA_EMERG_LOG("parse error in config file\n");
-			exit(EXIT_FAILURE);
-		}
-		free(config_file);
+	/* init receivers/filters/writers early to make help work */
+	recv_init();
+	filter_init();
+	writer_init();
+	if (conf.help_given || conf.detailed_help_given)
+		print_help_and_die();
+	drop_privileges_or_die(conf.user_arg, conf.group_arg);
+	parse_config_or_die();
+	init_colors_or_die();
+	daemon_set_flag(DF_LOG_TIME);
+	daemon_set_flag(DF_LOG_HOSTNAME);
+	daemon_set_flag(DF_LOG_LL);
+	if (conf.logfile_given) {
+		daemon_set_logfile(conf.logfile_arg);
+		daemon_open_log_or_die();
 	}
-	if (conf.logfile_given)
-		logfile = open_log(conf.logfile_arg);
-	log_welcome("para_audiod", conf.loglevel_arg);
-	i = init_stream_io();
-	if (i < 0) {
-		PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
+	ret = parse_stream_args();
+	if (ret < 0) {
+		PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 		exit(EXIT_FAILURE);
 	}
+	log_welcome("para_audiod");
 	server_uptime(UPTIME_SET);
 	set_initial_status();
 	FOR_EACH_SLOT(i)
@@ -1132,15 +1218,13 @@ int main(int argc, char *argv[])
 
 	init_status_task(stat_task);
 	init_command_task(cmd_task);
-	init_audiod_task(audiod_task);
 
 	if (conf.daemon_given)
-		daemon_init();
+		daemonize();
 
 	register_task(&sig_task->task);
 	register_task(&cmd_task->task);
 	register_task(&stat_task->task);
-	register_task(audiod_task);
 	s.default_timeout.tv_sec = 0;
 	s.default_timeout.tv_usec = 99 * 1000;
 	ret = schedule(&s);