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vf_drawtext: Add pkt_pos, pkt_duration, pkt_size as variables 

Changes to vf_drawtext.c written by
Calvin Walton <calvin.walton@kepstin.ca>

Changes to filters.texi written by
greg Luce <electron.rotoscope@gmail.com>
with lots of help from Moritz Barsnick and Gyan

Fixes #7947.
This commit is contained in:
Calvin Walton 2019-06-21 09:08:03 -04:00 committed by Gyan Doshi
parent b7b6ddd596
commit 2bd21b9609
3 changed files with 22 additions and 1 deletions
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11
doc/filters.texi
View File

@ -9002,6 +9002,17 @@ to each other, so you can for example specify @code{y=x/dar}.
@item pict_type
A one character description of the current frame's picture type.
@item pkt_pos
The current packet's position in the input file or stream
(in bytes, from the start of the input). A value of -1 indicates
this info is not available.
@item pkt_duration
The current packet's duration, in seconds.
@item pkt_size
The current packet's size (in bytes).
@end table
@anchor{drawtext_expansion}

3
libavfilter/version.h
View File

@ -31,7 +31,8 @@
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 56
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

9
libavfilter/vf_drawtext.c
View File

@ -88,6 +88,9 @@ static const char *const var_names[] = {
"x",
"y",
"pict_type",
"pkt_pos",
"pkt_duration",
"pkt_size",
NULL
};
@ -125,6 +128,9 @@ enum var_name {
VAR_X,
VAR_Y,
VAR_PICT_TYPE,
VAR_PKT_POS,
VAR_PKT_DURATION,
VAR_PKT_SIZE,
VAR_VARS_NB
};
@ -1516,6 +1522,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
NAN : frame->pts * av_q2d(inlink->time_base);
s->var_values[VAR_PICT_TYPE] = frame->pict_type;
s->var_values[VAR_PKT_POS] = frame->pkt_pos;
s->var_values[VAR_PKT_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base);
s->var_values[VAR_PKT_SIZE] = frame->pkt_size;
s->metadata = frame->metadata;
draw_text(ctx, frame, frame->width, frame->height);