The only flags, for now, indicate if metadata was updated and are set after
each call to
av_read_frame(). This comes with the caveat that, on stream start, it might not
be set properly
as packets might be buffered in AVFormatContext.packet_buffer before being
given to the user
in av_read_frame().
---
Let's give this a go. If everything is good, I'll send the updated patches for
the demuxers in a
separate thread.
doc/APIchanges | 4 ++++
libavformat/avformat.h | 22 ++++++++++++++++++++++
libavformat/version.h | 2 +-
3 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/doc/APIchanges b/doc/APIchanges
index 261993b..20c6303 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,10 @@ libavutil: 2013-12-xx
API changes, most recent first:
+2014-xx-xx - xxxxxxx - lavf 55.21.0 - avformat.h
+ Add AVFormatContext.event_flags and AVStream.event_flags for signaling to
+ the user when events happen in the file/stream.
+
2014-07-xx - xxxxxxx - lavu 53.19.0 - avstring.h
Make name matching function from lavf public as av_match_name().
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index ab2081a..3fc7b42 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -296,6 +296,11 @@ struct AVFormatContext;
* - sorting -- a modified version of a tag that should be used for
* sorting will have '-sort' appended. E.g. artist="The Beatles",
* artist-sort="Beatles, The".
+ * - Some protocols and demuxers support metadata updates. After a successful
+ * call to av_read_packet(), AVFormatContext.event_flags or
AVStream.event_flags
+ * will be updated to indicate if metadata changed. In order to detect
metadata
+ * changes on a stream, you need to loop through all streams in the
AVFormatContext
+ * and check their individual event_flags.
*
* - Demuxers attempt to export metadata in a generic format, however tags
* with no generic equivalents are left as they are stored in the container.
@@ -800,6 +805,14 @@ typedef struct AVStream {
*/
int nb_side_data;
+ /**
+ * Flags for the user to detect events happening on the stream. Flags must
+ * be cleared by the user once the event has been handled.
+ * A combination of AVFMT_EVENT_FLAG_*.
+ */
+ int event_flags;
+#define AVSTREAM_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in
updated metadata.
+
/*****************************************************************
* All fields below this line are not part of the public API. They
* may not be used outside of libavformat and can be changed and
@@ -1177,6 +1190,15 @@ typedef struct AVFormatContext {
* @see AVCodecContext.strict_std_compliance
*/
int strict_std_compliance;
+
+ /**
+ * Flags for the user to detect events happening on the file. Flags must
+ * be cleared by the user once the event has been handled.
+ * A combination of AVFMT_EVENT_FLAG_*.
+ */
+ int event_flags;
+#define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in
updated metadata.
+
/*****************************************************************
* All fields below this line are not part of the public API. They
* may not be used outside of libavformat and can be changed and
diff --git a/libavformat/version.h b/libavformat/version.h
index 6e9ce67..fbf5a0c 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFORMAT_VERSION_MAJOR 55
-#define LIBAVFORMAT_VERSION_MINOR 20
+#define LIBAVFORMAT_VERSION_MINOR 21
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
--
2.0.1
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