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lavfi/f_select: allow selection based on view ID

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Can be used together with the split filter to decompose multiview video
into individual views.
This commit is contained in:
Anton Khirnov 2024-06-09 18:41:38 +02:00
parent 6940a6de2f
commit 299d9115d4
2 changed files with 12 additions and 0 deletions
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3
doc/filters.texi
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@ -31111,6 +31111,9 @@ Represents the width of the input video frame.
@item ih @emph{(video only)}
Represents the height of the input video frame.
@item view @emph{(video only)}
View ID for multi-view video.
@end table
The default value of the select expression is "1".

9
libavfilter/f_select.c
View File

@ -93,6 +93,8 @@ static const char *const var_names[] = {
"ih", ///< ih: Represents the height of the input video frame.
"iw", ///< iw: Represents the width of the input video frame.
"view",
NULL
};
@ -150,6 +152,8 @@ enum var_name {
VAR_IH,
VAR_IW,
VAR_VIEW,
VAR_VARS_NB
};
@ -343,6 +347,7 @@ static void select_frame(AVFilterContext *ctx, AVFrame *frame)
SelectContext *select = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
FilterLink *inl = ff_filter_link(inlink);
const AVFrameSideData *sd;
double res;
if (isnan(select->var_values[VAR_START_PTS]))
@ -381,6 +386,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
av_dict_set(&frame->metadata, "lavfi.scene_score", buf, 0);
}
sd = av_frame_side_data_get(frame->side_data, frame->nb_side_data,
AV_FRAME_DATA_VIEW_ID);
select->var_values[VAR_VIEW] = sd ? *(int*)sd->data : NAN;
break;
}