[FFmpeg-devel] [PATCH 04/11] avcodec/packet: add some documentation for AVPacketSideData

[James Almer <jamrial@gmail.com>]

Explaining what or who may use it, and in what scenarios.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavcodec/packet.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/libavcodec/packet.h b/libavcodec/packet.h
index 96fc0084d6..85b3eeb728 100644
--- a/libavcodec/packet.h
+++ b/libavcodec/packet.h
@@ -312,6 +312,25 @@ enum AVPacketSideDataType {
 
 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
 
+/**
+ * This structure stores information for decoding, presenting, or otherwise
+ * processing the coded stream. It is typically exported by demuxers and
+ * encoders and can be fed to decoders and muxers in a per packet basis, or as
+ * global side data (applying to the entire coded stream) as follows:
+ * - During demuxing, it will be exported through global side data in
+ *   @ref AVStream.codecpar.side_data "AVStream's codec parameters", which can
+ *   then be passed as input to decoders through the
+ *   @ref AVCodecContext.coded_side_data "decoder context's side data", for
+ *   initialization.
+ * - For muxing, it can be fed through global side data in
+ *   @ref AVStream.codecpar.side_data "AVStream's codec parameters", typically
+ *   the output of encoders through the @ref AVCodecContext.coded_side_data
+ *   "encoder context's side data", for initialization.
+ *
+ * Different modules may accept or export different types of side data
+ * depending on media type and codec. Refer to @ref AVPacketSideDataType for a
+ * list of defined types and where they may be found or used.
+ */
 typedef struct AVPacketSideData {
     uint8_t *data;
     size_t   size;
-- 
2.42.0

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