vorbis: handle special packets in the middle of a stream

This allows for updating metadata from new metadata packets in the
middle of a stream (e.g., MPD streams). There still needs to be a signal
that there *is* new metadata, but this is at least gets the data into a
data structure.

Signed-off-by: Ben Boeckel <mathstuf@gmail.com>
Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 18 insertions, 0 deletions

diff --git a/libavcodec/vorbis_parser.h b/libavcodec/vorbis_parser.h
index 101df5d765..590101bbad 100644
--- a/libavcodec/vorbis_parser.h
+++ b/libavcodec/vorbis_parser.h
@@ -50,6 +50,24 @@ typedef struct VorbisParseContext {
  */
 int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, VorbisParseContext *s);
 
+#define VORBIS_FLAG_HEADER  0x00000001
+#define VORBIS_FLAG_COMMENT 0x00000002
+
+/**
+ * Get the duration for a Vorbis packet.
+ *
+ * avpriv_vorbis_parse_extradata() must have been successfully called prior to
+ * this in order for a correct duration to be returned. If @p flags is @c NULL,
+ * special frames are considered invalid.
+ *
+ * @param s        Vorbis parser context
+ * @param buf      buffer containing a Vorbis frame
+ * @param buf_size size of the buffer
+ * @param flags    flags for special frames
+ */
+int avpriv_vorbis_parse_frame_flags(VorbisParseContext *s, const uint8_t *buf,
+                                    int buf_size, int *flags);
+
 /**
  * Get the duration for a Vorbis packet.
  *