[FFmpeg-trac] #7947(avfilter:new): Feature request: expose more frame properties as variables in drawtext filter

[FFmpeg]

#7947: Feature request: expose more frame properties as variables in drawtext
filter
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  electron.rotoscope                 |
                 Type:  enhancement  |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  drawtext     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by electron.rotoscope):

 git checkout diff written by the amazing kepstin

 {{{
 From: Calvin Walton <calvin.walton at kepstin.ca>
 Date: Fri, 7 Jun 2019 15:06:36 -0400
 Subject: [PATCH] vf_drawtext: Add pkt_pos, pkt_duration, pkt_size as
 variables

 ---
  libavfilter/vf_drawtext.c | 9 +++++++++
  1 file changed, 9 insertions(+)

 diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
 index cca2cbcb88..beafe0ba81 100644
 --- a/libavfilter/vf_drawtext.c
 +++ b/libavfilter/vf_drawtext.c
 @@ -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
  };

 @@ -1487,6 +1493,9 @@ 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);
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7947#comment:1>
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