lavfi: add libavfilter/avcodec.h and avfilter_copy_frame_props()

avfilter_copy_frame_props() avoids code duplication and increases
robustness.

The added files libavfilter/avcodec.[ch] are used for containing
utilities useful for gluing togheter libavfilter and libavcodec.

1 files changed, 40 insertions, 0 deletions

diff --git a/libavfilter/avcodec.h b/libavfilter/avcodec.h
new file mode 100644
index 0000000000..f438860d0b
--- /dev/null
+++ b/libavfilter/avcodec.h
@@ -0,0 +1,40 @@
+/*
+ * 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
+ */
+
+#ifndef AVFILTER_AVCODEC_H
+#define AVFILTER_AVCODEC_H
+
+/**
+ * @file
+ * libavcodec/libavfilter gluing utilities
+ *
+ * This should be included in an application ONLY if the installed
+ * libavfilter has been compiled with libavcodec support, otherwise
+ * symbols defined below will not be available.
+ */
+
+#include "libavcodec/avcodec.h" // AVFrame
+#include "avfilter.h"
+
+/**
+ * Copy the frame properties of src to dst, without copying the actual
+ * image data.
+ */
+void avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src);
+
+#endif /* AVFILTER_AVCODEC_H */