@@ -3030,6 +3030,9 @@ It can accept an argument: a strftime() format string.

 @item n, frame_num

 The frame number, starting from 0.

+@item pict_type

+A 1 character description of the current picture type.

+

 @item pts

 The timestamp of the current frame, in seconds, with microsecond accuracy.

@@ -72,6 +72,7 @@ static const char *const var_names[] = {

     "text_w", "tw",           ///< width  of the rendered text

     "x",

     "y",

+    "pict_type",

     NULL

 };

@@ -108,6 +109,7 @@ enum var_name {

     VAR_TEXT_W, VAR_TW,

     VAR_X,

     VAR_Y,

+    VAR_PICT_TYPE,

     VAR_VARS_NB

 };

@@ -608,6 +610,15 @@ static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char

     return AVERROR(ENOSYS);

 }

+static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,

+                          char *fct, unsigned argc, char **argv, int tag)

+{

+    DrawTextContext *dtext = ctx->priv;

+

+    av_bprintf(bp, "%c", av_get_picture_type_char(dtext->var_values[VAR_PICT_TYPE]));

+    return 0;

+}

+

 static int func_pts(AVFilterContext *ctx, AVBPrint *bp,

                     char *fct, unsigned argc, char **argv, int tag)

 {

@@ -677,6 +688,7 @@ static const struct drawtext_function {

 } functions[] = {

     { "expr",      1, 1, 0,   func_eval_expr },

     { "e",         1, 1, 0,   func_eval_expr },

+    { "pict_type", 0, 0, 0,   func_pict_type },

     { "pts",       0, 0, 0,   func_pts      },

     { "gmtime",    0, 1, 'G', func_strftime },

     { "localtime", 0, 1, 'L', func_strftime },

@@ -987,6 +999,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

     dtext->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

         NAN : frame->pts * av_q2d(inlink->time_base);

+    dtext->var_values[VAR_PICT_TYPE] = frame->pict_type;

+

     draw_text(ctx, frame, frame->width, frame->height);

     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",