X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=audiod.c;h=1663dad3d88e8bb90ec69e2f7cffa1bcbd2ce64e;hp=a18489d543a610325cf7312f867b0d7e18e84f7e;hb=081ea8699e6a309c44446884b8c3752529d96a25;hpb=3741aebd97c1b370f4e783dd6d82dd9e690195a8

diff --git a/audiod.c b/audiod.c
index a18489d5..1663dad3 100644
--- a/audiod.c
+++ b/audiod.c
@@ -160,8 +160,9 @@ 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.
@@ -178,6 +179,27 @@ 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 chain 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;
@@ -580,6 +602,15 @@ static int receiver_running(int format)
 	return ret;
 }
 
+/**
+ * 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)
 {
 	int i, newest_slot = -1;
@@ -603,23 +634,22 @@ struct btr_node *audiod_get_btr_root(void)
 	return slot[newest_slot].receiver_node->btrn;
 }
 
-/* returns slot num on success. */
-static int open_current_receiver(void)
+/* whether a new instance of a decoder should be started. */
+static bool must_start_decoder(void)
 {
 	int ret, cafn = stat_task->current_audio_format_num;
 
 	if (cafn < 0 || !stat_task->ct)
-		return -1;
+		return false;
 	/* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 	if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
-		return -1;
+		return false;
 	ret = receiver_running(cafn);
 	if (ret != 0) /* already running */
-		return -1;
+		return false;
 	if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
-		return -1;
-	/* start a new receiver */
-	return open_receiver(cafn);
+		return false;
+	return true;
 }
 
 static unsigned compute_time_diff(const struct timeval *status_time)
@@ -843,6 +873,17 @@ 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) {
+			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++)
@@ -868,7 +909,7 @@ 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 *));
@@ -1098,7 +1139,9 @@ static void start_stop_decoders(void)
 	if (audiod_status != AUDIOD_ON ||
 			!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
 		return kill_all_decoders(-E_NOT_PLAYING);
-	ret = open_current_receiver();
+	if (!must_start_decoder())
+		return;
+	ret = open_receiver(stat_task->current_audio_format_num);
 	if (ret < 0)
 		return;
 	sl = slot + ret;
@@ -1113,12 +1156,20 @@ static void start_stop_decoders(void)
 static void status_pre_select(struct sched *s, struct task *t)
 {
 	struct status_task *st = container_of(t, struct status_task, task);
-	int ret;
+	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)
-		sched_min_delay(s);
-	sched_request_barrier(&st->restart_barrier, s);
+	if (ret > 0)
+		goto min_delay;
+	if (!st->ct)
+		sched_request_barrier_or_min_delay(&st->restart_barrier, s);
+	if (cafn >= 0)
+		sched_request_barrier(&afi[cafn].restart_barrier, s);
+	return;
+min_delay:
+	sched_min_delay(s);
 }
 
 /* restart the client task if necessary */