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lavu/frame: extend AVFrame.repeat_pict documentation

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This commit is contained in:
Anton Khirnov 2023-05-07 12:19:31 +02:00
parent 02823210d7
commit d45a296732
1 changed files with 16 additions and 2 deletions
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18
libavutil/frame.h
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@ -491,8 +491,22 @@ typedef struct AVFrame {
void *opaque;
/**
* When decoding, this signals how much the picture must be delayed.
* extra_delay = repeat_pict / (2*fps)
* Number of fields in this frame which should be repeated, i.e. the total
* duration of this frame should be repeat_pict + 2 normal field durations.
*
* For interlaced frames this field may be set to 1, which signals that this
* frame should be presented as 3 fields: beginning with the first field (as
* determined by AV_FRAME_FLAG_TOP_FIELD_FIRST being set or not), followed
* by the second field, and then the first field again.
*
* For progressive frames this field may be set to a multiple of 2, which
* signals that this frame's duration should be (repeat_pict + 2) / 2
* normal frame durations.
*
* @note This field is computed from MPEG2 repeat_first_field flag and its
* associated flags, H.264 pic_struct from picture timing SEI, and
* their analogues in other codecs. Typically it should only be used when
* higher-layer timing information is not available.
*/
int repeat_pict;