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added start_number parameter to drawtext to permit an offset to n/frame_num var

This commit is contained in:
Mark Visser 2013-05-21 16:14:46 -04:00
parent 7fff3df6b2
commit 0defc77e9d
2 changed files with 7 additions and 1 deletions
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4
doc/filters.texi
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@ -3068,6 +3068,10 @@ The x and y offsets for the text shadow position with respect to the
position of the text. They can be either positive or negative
values. Default value for both is "0".
@item start_number
The starting frame number for the n/frame_num variable. The default value
is "0".
@item tabsize
The size in number of spaces to use for rendering the tab.
Default value is 4.

4
libavfilter/vf_drawtext.c
View File

@ -164,6 +164,7 @@ typedef struct {
AVTimecode tc; ///< timecode context
int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
int reload; ///< reload text file for each frame
int start_number; ///< starting frame number for n/frame_num var
} DrawTextContext;
#define OFFSET(x) offsetof(DrawTextContext, x)
@ -198,6 +199,7 @@ static const AVOption drawtext_options[]= {
{"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
{"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
{"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
/* FT_LOAD_* flags */
{ "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT | FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags" },
@ -614,7 +616,7 @@ static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
{
DrawTextContext *s = ctx->priv;
av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
av_bprintf(bp, "%d", (int)s->var_values[VAR_N]+s->start_number);
return 0;
}