X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=vss.c;h=ba6f7c4c655134d11d79e6411ab92d63b4efd160;hp=2dab278dfff9c20983e3353e9a86a7147904262a;hb=c6c03bac20656834d531813cedb6304cf0fef21e;hpb=ead9cdc8160656e868f1d709ad1a764f9dcc3a2f

diff --git a/vss.c b/vss.c
index 2dab278d..ba6f7c4c 100644
--- a/vss.c
+++ b/vss.c
@@ -338,6 +338,26 @@ static int initialize_fec_client(struct fec_client *fc, struct vss_task *vsst)
 	return 1;
 }
 
+static void vss_get_chunk(int chunk_num, struct vss_task *vsst,
+		char **buf, size_t *sz)
+{
+	/*
+	 * Chunk zero is special for header streams: It is the first portion of
+	 * the audio file which consists of the audio file header. It may be
+	 * arbitrary large due to embedded meta data. Audio format handlers may
+	 * replace the header by a stripped one with meta data omitted which is
+	 * of bounded size. We always use the stripped header for streaming
+	 * rather than the unmodified header (chunk zero).
+	 */
+	if (chunk_num == 0 && vsst->header_len > 0) {
+		*buf = vsst->header_buf; /* stripped header */
+		*sz = vsst->header_len;
+		return;
+	}
+	afh_get_chunk(chunk_num, &mmd->afd.afhi, vsst->map, (const char **)buf,
+		sz);
+}
+
 static void compute_group_size(struct vss_task *vsst, struct fec_group *g,
 		int max_bytes)
 {
@@ -352,7 +372,7 @@ static void compute_group_size(struct vss_task *vsst, struct fec_group *g,
 	 * of exactly one chunk for these audio formats.
 	 */
 	for (i = 0;; i++) {
-		const char *buf;
+		char *buf;
 		size_t len;
 		int chunk_num = g->first_chunk + i;
 
@@ -360,7 +380,7 @@ static void compute_group_size(struct vss_task *vsst, struct fec_group *g,
 			break;
 		if (chunk_num >= mmd->afd.afhi.chunks_total) /* eof */
 			break;
-		afh_get_chunk(chunk_num, &mmd->afd.afhi, vsst->map, &buf, &len);
+		vss_get_chunk(chunk_num, vsst, &buf, &len);
 		if (g->bytes + len > max_bytes)
 			break;
 		/* Include this chunk */
@@ -482,7 +502,7 @@ static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
 {
 	int ret, i, k, n, data_slices;
 	size_t len;
-	const char *buf;
+	char *buf;
 	struct fec_group *g = &fc->group;
 
 	if (fc->state == FEC_STATE_NONE) {
@@ -543,7 +563,7 @@ static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
 	}
 
 	/* setup data slices */
-	afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &buf, &len);
+	vss_get_chunk(g->first_chunk, vsst, &buf, &len);
 	for (; i < g->num_header_slices + data_slices; i++) {
 		if (buf + g->slice_bytes > vsst->map + mmd->size) {
 			/*
@@ -1062,7 +1082,7 @@ static void vss_send(struct vss_task *vsst)
 	compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
 		&mmd->stream_start, &due);
 	if (tv_diff(&due, now, NULL) <= 0) {
-		const char *buf;
+		char *buf;
 		size_t len;
 
 		if (!mmd->chunks_sent) {
@@ -1075,8 +1095,7 @@ static void vss_send(struct vss_task *vsst)
 		 * they might have still some data queued which can be sent in
 		 * this case.
 		 */
-		afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
-			&buf, &len);
+		vss_get_chunk(mmd->current_chunk, vsst, &buf, &len);
 		for (i = 0; senders[i].name; i++) {
 			if (!senders[i].send)
 				continue;
@@ -1167,5 +1186,6 @@ void init_vss_task(int afs_socket)
 		tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
 			&vsst->data_send_barrier);
 	}
+	sprintf(vsst->task.status, "vss task");
 	register_task(&vsst->task);
 }