[FFmpeg-cvslog] lavc: add some AVPacket doxy.

[Anton Khirnov]

ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Wed Oct 31 17:27:24 2012 +0100| [0876c28080750e0978ba77c3f72cdd2b0d069a6f] | committer: Anton Khirnov

lavc: add some AVPacket doxy.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0876c28080750e0978ba77c3f72cdd2b0d069a6f
---

 libavcodec/avcodec.h |   22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index d6a4e4d..73321b2 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -872,6 +872,28 @@ enum AVPacketSideDataType {
     AV_PKT_DATA_H263_MB_INFO,
 };
 
+/**
+ * This structure stores compressed data. It is typically exported by demuxers
+ * and then passed as input to decoders, or received as output from encoders and
+ * then passed to muxers.
+ *
+ * For video, it should typically contain one compressed frame. For audio it may
+ * contain several compressed frames.
+ *
+ * AVPacket is one of the few structs in Libav, whose size is a part of public
+ * ABI. Thus it may be allocated on stack and no new fields can be added to it
+ * without libavcodec and libavformat major bump.
+ *
+ * The semantics of data ownership depends on the destruct field.
+ * If it is set, the packet data is dynamically allocated and is valid
+ * indefinitely until av_free_packet() is called (which in turn calls the
+ * destruct callback to free the data). If destruct is not set, the packet data
+ * is typically backed by some static buffer somewhere and is only valid for a
+ * limited time (e.g. until the next read call when demuxing).
+ *
+ * The side data is always allocated with av_malloc() and is freed in
+ * av_free_packet().
+ */
 typedef struct AVPacket {
     /**
      * Presentation timestamp in AVStream->time_base units; the time at which