lavf: add an AVClass to AVStream on next major bump

Also add a function to retrieve that class, analogously to
avformat_get_class().

This will be useful for adding an AVOption for dispositions.

1 files changed, 15 insertions, 0 deletions

diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index c38fac5a37..da92a3847a 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -909,6 +909,13 @@ typedef struct AVIndexEntry {
  * sizeof(AVStream) must not be used outside libav*.
  */
 typedef struct AVStream {
+#if FF_API_AVSTREAM_CLASS
+    /**
+     * A class for @ref avoptions. Set on stream creation.
+     */
+    const AVClass *av_class;
+#endif
+
     int index;    /**< stream index in AVFormatContext */
     /**
      * Format-specific stream ID.
@@ -1865,6 +1872,14 @@ void avformat_free_context(AVFormatContext *s);
 const AVClass *avformat_get_class(void);
 
 /**
+ * Get the AVClass for AVStream. It can be used in combination with
+ * AV_OPT_SEARCH_FAKE_OBJ for examining options.
+ *
+ * @see av_opt_find().
+ */
+const AVClass *av_stream_get_class(void);
+
+/**
  * Add a new stream to a media file.
  *
  * When demuxing, it is called by the demuxer in read_header(). If the