lavf/subtitles: add some SMIL helpers.

This is needed for SAMI and RealText demuxers.

1 files changed, 16 insertions, 0 deletions

diff --git a/libavformat/subtitles.h b/libavformat/subtitles.h
index 8a75161d5e..b089bb2a87 100644
--- a/libavformat/subtitles.h
+++ b/libavformat/subtitles.h
@@ -23,6 +23,7 @@
 
 #include <stdint.h>
 #include "avformat.h"
+#include "libavutil/bprint.h"
 
 typedef struct {
     AVPacket *subs;         ///< array of subtitles packets
@@ -58,4 +59,19 @@ int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt);
  */
 void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q);
 
+/**
+ * SMIL helper to load next chunk ("<...>" or untagged content) in buf.
+ *
+ * @param c cached character, to avoid a backward seek
+ */
+int ff_smil_extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c);
+
+/**
+ * SMIL helper to point on the value of an attribute in the given tag.
+ *
+ * @param s    SMIL tag ("<...>")
+ * @param attr the attribute to look for
+ */
+const char *ff_smil_get_attr_ptr(const char *s, const char *attr);
+
 #endif /* AVFORMAT_SUBTITLES_H */