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avcodec/progressframe: Explain how unnamed union can simplify accesses 

This relies on the common initial seqence guarantee
(and on C11 support for unnamed members).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2024-04-19 14:59:29 +02:00
parent 822e2843ca
commit 1d17d84b7d
1 changed files with 12 additions and 0 deletions
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12
libavcodec/progressframe.h
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@ -58,6 +58,18 @@
struct AVCodecContext; struct AVCodecContext;
/**
* The ProgressFrame structure.
* Hint: It is guaranteed that the AVFrame pointer is at the start
* of ProgressFrame. This allows to use an unnamed
* union {
* struct {
* AVFrame *f;
* };
* ProgressFrame pf;
* };
* to simplify accessing the embedded AVFrame.
*/
typedef struct ProgressFrame { typedef struct ProgressFrame {
struct AVFrame *f; struct AVFrame *f;
struct ProgressInternal *progress; struct ProgressInternal *progress;