From: Limin Wang <lance.lmw...@gmail.com>
Signed-off-by: Limin Wang <lance.lmw...@gmail.com>
---
doc/filters.texi | 4 ++++
libavfilter/vf_drawtext.c | 19 +++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index 5f0eb28..8334f46 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -9825,6 +9825,10 @@ If both @var{text} and @var{textfile} are specified, an
error is thrown.
If set to 1, the @var{textfile} will be reloaded before each frame.
Be sure to update it atomically, or it may be read partially, or even fail.
+@item frame_tc
+If set to 1, the timecode in S12M side data will be used for each frame
+if have, 0 otherwise
+
@item x
@item y
The expressions which specify the offsets where text will be drawn
diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index abe1ca6..018997a 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -197,6 +197,7 @@ typedef struct DrawTextContext {
AVRational tc_rate; ///< frame rate for timecode
AVTimecode tc; ///< timecode context
int tc24hmax; ///< 1 if timecode is wrapped to 24 hours,
0 otherwise
+ int frame_tc; ///< 1 use timecode in S12M side data for
each frame, 0 otherwise
int reload; ///< reload text file for each frame
int start_number; ///< starting frame number for n/frame_num
var
#if CONFIG_LIBFRIBIDI
@@ -268,6 +269,7 @@ static const AVOption drawtext_options[]= {
{ "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 =
FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags"
},
{ "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 =
FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags"
},
{ "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 =
FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags"
},
+ {"frame_tc", "use timecode in S21M side data for each frame if have",
OFFSET(frame_tc), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{ NULL }
};
@@ -1327,6 +1329,23 @@ static int draw_text(AVFilterContext *ctx, AVFrame
*frame,
break;
}
+ if (s->frame_tc) {
+ AVFrameSideData *sd;
+
+ if (sd = av_frame_get_side_data(frame, AV_FRAME_DATA_S12M_TIMECODE)) {
+ uint32_t *tc = (uint32_t*)sd->data;
+ int m = tc[0] & 3;
+
+ av_bprint_clear(bp);
+ av_bprintf(bp, "%s", s->text);
+ for (int j = 1; j <= m; j++) {
+ char tcbuf[AV_TIMECODE_STR_SIZE];
+ av_timecode_make_smpte_tc_string(tcbuf, tc[j], 0);
+ av_bprintf(bp, "%s%s", tcbuf, j != m ? ", " : "");
+ }
+ }
+ }
+
if (s->tc_opt_string) {
char tcbuf[AV_TIMECODE_STR_SIZE];
av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out);
--
1.8.3.1
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