X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=fecdec_filter.c;h=d5593f25d02c5cde248e0c775a1d3235a279ef8f;hp=6b6716a115c18c26429d12d49f38a40981314574;hb=132ab6b63568104d28af23a9682c770a0aaedf03;hpb=eb51951a61a641ef0c403c3c6df560f29b8c5468

diff --git a/fecdec_filter.c b/fecdec_filter.c
index 6b6716a1..d5593f25 100644
--- a/fecdec_filter.c
+++ b/fecdec_filter.c
@@ -28,7 +28,7 @@
 #define NUM_FEC_GROUPS 3
 
 /** Size of the output buffer of the fecdec filter. */
-#define FECDEC_OUTBUF_SIZE 81920
+#define FECDEC_OUTBUF_SIZE (128 * 1024)
 
 /** Data read from the header of a slice. */
 struct fec_header {
@@ -92,10 +92,6 @@ static void clear_group(struct fecdec_group *fg)
 {
 	int i;
 
-	if (!group_complete(fg) && !group_empty(fg))
-		PARA_WARNING_LOG("Clearing incomplete group %d "
-			"(contains %d slices)\n", fg->h.group_num,
-			fg->num_received_slices);
 	for (i = 0; i < fg->num_slices; i++) {
 		free(fg->data[i]);
 		fg->data[i] = NULL;
@@ -116,7 +112,10 @@ static int find_group(struct fec_header *h,
 	FOR_EACH_FECDEC_GROUP(fg, pfd) {
 		if (fg->h.group_num != h->group_num)
 			continue;
-		/* FIXME: Add some more sanity checks here */
+		if (fg->h.slices_per_group != h->slices_per_group)
+			continue;
+		if (fg->h.data_slices_per_group != h->data_slices_per_group)
+			continue;
 		*result = fg;
 		return 1;
 	}
@@ -155,10 +154,15 @@ static struct fecdec_group *free_oldest_group(struct private_fecdec_data *pfd)
 		if (!oldest || oldest->h.group_num > fg->h.group_num)
 			oldest = fg;
 	}
+	if (!group_complete(oldest) && !group_empty(oldest))
+		PARA_WARNING_LOG("Clearing incomplete group %d "
+			"(contains %d slices)\n", fg->h.group_num,
+			fg->num_received_slices);
 	clear_group(oldest);
 	return oldest;
 }
 
+/* returns 1 if the group was found, 0 if not, negative on errors */
 static int get_group(struct fec_header *h, struct private_fecdec_data *pfd,
 		struct fecdec_group **result)
 {
@@ -172,24 +176,33 @@ static int get_group(struct fec_header *h, struct private_fecdec_data *pfd,
 	/* group not found */
 	fg = find_unused_group(pfd);
 	if (fg)
-		goto update_header;
+		goto success;
 	fg = try_to_free_group(pfd);
 	if (fg)
-		goto update_header;
+		goto success;
 	fg = free_oldest_group(pfd);
-update_header:
-	fg->h = *h;
+	ret = 0;
 success:
+	fg->h = *h;
 	*result = fg;
-	return 1;
+	return ret;
 }
 
+/*
+ * returns 1 if slice was added, zero otherwise (because the group was already
+ * complete). In any case the number of received slices is being increased by
+ * one.
+ */
 static int add_slice(char *buf, struct fecdec_group *fg)
 {
 	int r, slice_num;
 
-	if (group_complete(fg))
+	if (group_complete(fg)) {
+		PARA_DEBUG_LOG("group complete, ignoring slice %d\n",
+			fg->h.slice_num);
+		fg->num_received_slices++;
 		return 0;
+	}
 	slice_num = fg->h.slice_num;
 	if (fg->num_slices == 0) {
 		fg->num_slices = fg->h.slices_per_group;
@@ -254,13 +267,14 @@ static int read_fec_header(char *buf, size_t len, struct fec_header *h)
 
 	h->slice_num = read_u8(buf + 18);
 	h->slice_bytes = read_u16(buf + 20);
-	if (!h->group_bytes && & h->slice_bytes)
+	if (!memcmp(buf, FEC_EOF_PACKET, FEC_EOF_PACKET_LEN))
 		return -E_FECDEC_EOF;
 //	PARA_DEBUG_LOG("group %u, slize %u, slices per group: %u\n",
 //		h->group_num, h->slice_num, h->slices_per_group);
 	return 1;
 }
 
+/* returns 1 if we used the buffer, 0 if we didn't, negative on errors */
 static int dispatch_slice(char *buf, size_t len, struct fec_header *h,
 		struct filter_node *fn)
 {
@@ -273,15 +287,8 @@ static int dispatch_slice(char *buf, size_t len, struct fec_header *h,
 	ret = get_group(h, pfd, &fg);
 	if (ret < 0)
 		return ret;
-	if (group_complete(fg)) {
-		PARA_DEBUG_LOG("group complete, ignoring slice %d\n",
-			h->slice_num);
+	if (!add_slice(buf, fg))
 		return 1;
-	}
-	fg->h = *h;
-	ret = add_slice(buf, fg);
-	if (ret < 0)
-		return ret;
 	if (group_complete(fg)) {
 		if (!pfd->fec) {
 			int k = h->data_slices_per_group, n = h->slices_per_group;
@@ -297,7 +304,7 @@ static int dispatch_slice(char *buf, size_t len, struct fec_header *h,
 	return 1;
 }
 
-static int fecdec(char *buf, size_t len, struct filter_node *fn)
+static ssize_t fecdec(char *buf, size_t len, struct filter_node *fn)
 {
 	int ret;
 	struct fec_header h;