X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=vss.c;h=14cff6960eb2ef1dcfbff1f03dee7da4e3cb6a18;hp=4be6e18a6833c313b40c0453a10fe021b75b3ee5;hb=96dd1284a1b7d565560979fdc7ec647aeceb6b52;hpb=f099900540c4e4c54b10181254b895ccfe6ef410

diff --git a/vss.c b/vss.c
index 4be6e18a..14cff696 100644
--- a/vss.c
+++ b/vss.c
@@ -131,14 +131,18 @@ struct fec_group {
 	uint8_t num_header_slices;
 };
 
+enum fec_client_state {
+	FEC_STATE_NONE = 0,	/**< not initialized and not enabled */
+	FEC_STATE_DISABLED,	/**< temporarily disabled */
+	FEC_STATE_READY_TO_RUN	/**< initialized and enabled */
+};
+
 /**
  * Describes one connected FEC client.
  */
 struct fec_client {
-	/** If negative, this client is temporarily disabled. */
-	int error;
-	/** Whether the sender client is ready to push out data. */
-	bool ready;
+	/** Current state of the client */
+	enum fec_client_state state;
 	/** The connected sender client (transport layer). */
 	struct sender_client *sc;
 	/** Parameters requested by the client. */
@@ -375,7 +379,6 @@ static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
 
 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
 {
-	assert(fc->error >= 0);
 	if (fc->first_stream_chunk < 0 || fc->current_slice_num
 			== fc->fcp->slices_per_group + fc->num_extra_slices) {
 		int ret = setup_next_fec_group(fc, vsst);
@@ -384,8 +387,8 @@ static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
 		if (ret < 0) {
 			PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 			PARA_ERROR_LOG("FEC client temporarily disabled\n");
-			fc->error = ret;
-			return fc->error;
+			fc->state = FEC_STATE_DISABLED;
+			return ret;
 		}
 	}
 	write_fec_header(fc, vsst);
@@ -469,11 +472,10 @@ static void compute_slice_timeout(struct timeval *timeout)
 {
 	struct fec_client *fc;
 
-	assert(vss_playing());
 	list_for_each_entry(fc, &fec_client_list, node) {
 		struct timeval diff;
 
-		if (fc->error < 0)
+		if (fc->state != FEC_STATE_READY_TO_RUN)
 			continue;
 		if (next_slice_is_due(fc, &diff)) {
 			timeout->tv_sec = 0;
@@ -496,7 +498,7 @@ static void set_eof_barrier(struct vss_task *vsst)
 	list_for_each_entry(fc, &fec_client_list, node) {
 		struct timeval group_duration;
 
-		if (fc->error < 0)
+		if (fc->state != FEC_STATE_READY_TO_RUN)
 			continue;
 		tv_scale(fc->group.num_chunks, chunk_tv, &group_duration);
 		if (tv_diff(&timeout, &group_duration, NULL) < 0)
@@ -700,7 +702,7 @@ static void vss_pre_select(struct sched *s, struct task *t)
 				senders[i].shutdown_clients();
 		list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
 			fc->first_stream_chunk = -1;
-			fc->error = 0;
+			fc->state = FEC_STATE_NONE;
 		}
 		mmd->stream_start.tv_sec = 0;
 		mmd->stream_start.tv_usec = 0;
@@ -854,7 +856,7 @@ static int initialize_fec_client(struct fec_client *fc)
 	fc->num_extra_slices = 0;
 	fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
 	fc->next_header_time.tv_sec = 0;
-	fc->ready = true;
+	fc->state = FEC_STATE_READY_TO_RUN;
 	return 1;
 err:
 	fec_free(fc->parms);
@@ -884,14 +886,18 @@ static void vss_send(struct vss_task *vsst)
 			&due, 1) < 0)
 		return;
 	list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
-		if (fc->error < 0)
+		switch (fc->state) {
+		case FEC_STATE_DISABLED:
 			continue;
-		if (!fc->ready) {
+		case FEC_STATE_NONE:
 			ret = initialize_fec_client(fc);
 			if (ret < 0) {
 				PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 				continue;
 			}
+			/* fall through */
+		case FEC_STATE_READY_TO_RUN:
+			break;
 		}
 		if (!next_slice_is_due(fc, NULL)) {
 			fec_active = 1;