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lavf: add AVFormatContext/AVStream fields for signaling to the user when events happen.

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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().

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Andrew Stone 2014-08-08 13:09:23 -04:00 committed by Anton Khirnov
parent 72199e1041
commit afbd4b7e09
3 changed files with 27 additions and 1 deletions
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4
doc/APIchanges
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@ -13,6 +13,10 @@ libavutil: 2014-08-09
API changes, most recent first:
2014-xx-xx - xxxxxxx - lavf 56.01.0 - avformat.h
Add AVFormatContext.event_flags and AVStream.event_flags for signaling to
the user when events happen in the file/stream.
2014-04-xx - xxxxxxx - lavr 2.1.0 - avresample.h
Add avresample_convert_frame() and avresample_config().

22
libavformat/avformat.h
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@ -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.
@ -798,6 +803,14 @@ 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 AVSTREAM_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
@ -1170,6 +1183,15 @@ 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

2
libavformat/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFORMAT_VERSION_MAJOR 56
#define LIBAVFORMAT_VERSION_MINOR 0
#define LIBAVFORMAT_VERSION_MINOR 1
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \