Add some asserts.

diff --git a/src/lib/dcp_decoder.cc b/src/lib/dcp_decoder.cc
index 85fa41ddde0a9e5c1e7ce075a4013fb606961cfc..b9cb66a607c0bdd10c6c53a20596c42d93b3e3d8 100644 (file)
--- a/src/lib/dcp_decoder.cc
+++ b/src/lib/dcp_decoder.cc
@@ -195,12 +195,14 @@ DCPDecoder::pass_texts (ContentTime next)
 {
        list<shared_ptr<TextDecoder> >::const_iterator decoder = text.begin ();
        if ((*_reel)->main_subtitle()) {
+               DCPOMATIC_ASSERT (decoder != text.end ());
                pass_texts (
                        next, (*_reel)->main_subtitle()->asset(), _dcp_content->reference_text(TEXT_OPEN_SUBTITLE), (*_reel)->main_subtitle()->entry_point(), *decoder
                        );
                ++decoder;
        }
        if ((*_reel)->closed_caption()) {
+               DCPOMATIC_ASSERT (decoder != text.end ());
                pass_texts (
                        next, (*_reel)->closed_caption()->asset(), _dcp_content->reference_text(TEXT_CLOSED_CAPTION), (*_reel)->closed_caption()->entry_point(), *decoder
                        );