shithub: dav1d

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Allow redundant sequence header

--- a/src/obu.c

+++ b/src/obu.c

@@ -1233,7 +1233,6 @@

         if (!ref) return -ENOMEM;

         Dav1dSequenceHeader *seq_hdr = ref->data;

         memset(seq_hdr, 0, sizeof(*seq_hdr));

-        c->frame_hdr = NULL;

         if ((res = parse_seq_hdr(c, &gb, seq_hdr)) < 0) {

             dav1d_ref_dec(&ref);

             return res;

@@ -1245,7 +1244,10 @@

         // If we have read a sequence header which is different from

         // the old one, this is a new video sequence and can't use any

         // previous state. Free that state.

-        if (c->seq_hdr && memcmp(seq_hdr, c->seq_hdr, sizeof(*seq_hdr))) {

+        if (!c->seq_hdr)

+            c->frame_hdr = NULL;

+        else if (memcmp(seq_hdr, c->seq_hdr, sizeof(*seq_hdr))) {

+            c->frame_hdr = NULL;

             for (int i = 0; i < 8; i++) {

                 if (c->refs[i].p.p.data[0])

                     dav1d_thread_picture_unref(&c->refs[i].p);