vss: Honor header chunk when computing FEC group start.

The first chunk of an ogg vorbis file is the audio file header
which should not be included in the calculation of the FEC
group timing.

diff --git a/vss.c b/vss.c
index babcd24c9a1e55cf95b1dcb6d340e5b5d490cb06..aae601d14153d6973a8a86f8f8a93e69cd6c8bbd 100644 (file)
--- a/vss.c
+++ b/vss.c
@@ -354,7 +354,12 @@ static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
                g->num_header_slices, data_slices
        );
        /* set group start */
-       tv_scale(g->first_chunk - fc->first_stream_chunk, chunk_tv, &tmp);
+       if (g->num != 0 && vsst->header_len != 0 && fc->first_stream_chunk == 0)
+               /* chunk #0 is the audio file header */
+               tv_scale(g->first_chunk - 1, chunk_tv, &tmp);
+       else
+               tv_scale(g->first_chunk - fc->first_stream_chunk,
+                       chunk_tv, &tmp);
        tv_add(&fc->stream_start, &tmp, &g->start);
        return 1;
 }