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drawtext: allow burning the timecode.

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This commit is contained in:
Clément Bœsch 2011-12-06 11:19:11 +01:00 committed by Clément Bœsch
parent ad5ade6615
commit fa4e30af7e
2 changed files with 28 additions and 1 deletions
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7
doc/filters.texi
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@ -1148,6 +1148,13 @@ the number of input frame, starting from 0
@item t
timestamp expressed in seconds, NAN if the input timestamp is unknown
@item timecode
initial timecode representation in "hh:mm:ss[:;.]ff" format. It can be used
with or without text parameter. @var{rate} option must be specified
@item r, rate
frame rate (timecode only)
@end table
Some examples follow.

22
libavfilter/vf_drawtext.c
View File

@ -29,6 +29,8 @@
#include <sys/time.h>
#include <time.h>
#include "libavcodec/timecode.h"
#include "libavutil/avstring.h"
#include "libavutil/colorspace.h"
#include "libavutil/file.h"
#include "libavutil/eval.h"
@ -154,6 +156,8 @@ typedef struct {
AVExpr *d_pexpr;
int draw; ///< set to zero to prevent drawing
AVLFG prng; ///< random
struct ff_timecode tc;
int frame_id;
} DrawTextContext;
#define OFFSET(x) offsetof(DrawTextContext, x)
@ -174,6 +178,9 @@ static const AVOption drawtext_options[]= {
{"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX },
{"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.dbl=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX },
{"draw", "if false do not draw", OFFSET(d_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX },
{"timecode", "set initial timecode", OFFSET(tc.str), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX },
{"r", "set rate (timecode only)", OFFSET(tc.rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX },
{"rate", "set rate (timecode only)", OFFSET(tc.rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX },
/* FT_LOAD_* flags */
{"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },
@ -333,9 +340,16 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
av_file_unmap(textbuf, textbuf_size);
}
if (dtext->tc.str) {
if (ff_init_smtpe_timecode(ctx, &dtext->tc) < 0)
return AVERROR(EINVAL);
if (!dtext->text)
dtext->text = av_strdup("");
}
if (!dtext->text) {
av_log(ctx, AV_LOG_ERROR,
"Either text or a valid file must be provided\n");
"Either text, a valid file or a timecode must be provided\n");
return AVERROR(EINVAL);
}
@ -708,6 +722,12 @@ static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
buf_size *= 2;
} while ((buf = av_realloc(buf, buf_size)));
if (dtext->tc.str) {
char tcbuf[sizeof("hh:mm:ss.ff")];
avpriv_timecode_to_string(tcbuf, &dtext->tc, dtext->frame_id++);
buf = av_asprintf("%s%s", dtext->text, tcbuf);
}
if (!buf)
return AVERROR(ENOMEM);
text = dtext->expanded_text = buf;