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avfilter/drawtext: add pict_type support

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Fixes Ticket2470

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-04-23 03:27:42 +02:00
parent 15d2f26998
commit a9a537b154
2 changed files with 17 additions and 0 deletions
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3
doc/filters.texi
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@ -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.

14
libavfilter/vf_drawtext.c
View File

@ -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",