avformat/utils: Move parser functions to a new file, demux_utils.c

This file is both for the various public APIs that are demuxer-only
as well as for the demuxer-only internal functions.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/demux_utils.c

@@ -0,0 +1,34 @@
+/*
+ * Various utility demuxing functions
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "demux.h"
+#include "internal.h"
+
+struct AVCodecParserContext *av_stream_get_parser(const AVStream *st)
+{
+    return cffstream(st)->parser;
+}
+
+void avpriv_stream_set_need_parsing(AVStream *st, enum AVStreamParseType type)
+{
+    ffstream(st)->need_parsing = type;
+}