Janne Grunau wrote:
+@item RTCTIME
+current wallclock (RTC) time in microseconds
+
+@item RTCSTART
+current wallclock (RTC) time at the start of the movie in microseconds
+
s/current //
fixed
+# generate timestamps from a "live source" and rebase onto the current timebase
+setpts='(GETTIME - STARTTIME) / (TB * 1000000)"
s/GETTIME/RTCTIME/;s/STARTTIME/RTCSTART/
fixed
+ "RTCTIME", ///< current wallclock (RTC) time in micro seconds
+ "RTCSTART", ///< current wallclock (RTC) time at the start of the movie
in micro seconds
s/current //
fixed
>From 184c07a82336e2afb47db79a3a421fdc82f4a227 Mon Sep 17 00:00:00 2001
From: Vladimir Pantelic <[email protected]>
Date: Wed, 23 Jan 2013 13:54:08 +0100
Subject: [PATCH] avfilter: allow setpts filter to use wallclock time for
calculations
Signed-off-by: Vladimir Pantelic <[email protected]>
---
doc/filters.texi | 9 +++++++++
libavfilter/vf_setpts.c | 7 +++++++
2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 34db2f4..2bd013d 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1864,6 +1864,12 @@ previous input PTS
@item PREV_OUTPTS
previous output PTS
+@item RTCTIME
+wallclock (RTC) time in microseconds
+
+@item RTCSTART
+wallclock (RTC) time at the start of the movie in microseconds
+
@end table
Some examples follow:
@@ -1883,6 +1889,9 @@ setpts=N/(25*TB)
# fixed rate 25 fps with some jitter
setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
+
+# generate timestamps from a "live source" and rebase onto the current timebase
+setpts='(RTCTIME - RTCSTART) / (TB * 1000000)"
@end example
@anchor{setsar}
diff --git a/libavfilter/vf_setpts.c b/libavfilter/vf_setpts.c
index 0c4881e..79cadd4 100644
--- a/libavfilter/vf_setpts.c
+++ b/libavfilter/vf_setpts.c
@@ -29,6 +29,7 @@
#include "libavutil/eval.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
+#include "libavutil/time.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
@@ -45,6 +46,8 @@ static const char *const var_names[] = {
"PTS", ///< original pts in the file of the frame
"STARTPTS", ///< PTS at start of movie
"TB", ///< timebase
+ "RTCTIME", ///< wallclock (RTC) time in micro seconds
+ "RTCSTART", ///< wallclock (RTC) time at the start of the movie in micro seconds
NULL
};
@@ -60,6 +63,8 @@ enum var_name {
VAR_PTS,
VAR_STARTPTS,
VAR_TB,
+ VAR_RTCTIME,
+ VAR_RTCSTART,
VAR_VARS_NB
};
@@ -94,6 +99,7 @@ static int config_input(AVFilterLink *inlink)
SetPTSContext *setpts = inlink->dst->priv;
setpts->var_values[VAR_TB] = av_q2d(inlink->time_base);
+ setpts->var_values[VAR_RTCSTART] = av_gettime();
av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
return 0;
@@ -114,6 +120,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
setpts->var_values[VAR_INTERLACED] = frame->video->interlaced;
setpts->var_values[VAR_PTS ] = TS2D(frame->pts);
setpts->var_values[VAR_POS ] = frame->pos == -1 ? NAN : frame->pos;
+ setpts->var_values[VAR_RTCTIME ] = av_gettime();
d = av_expr_eval(setpts->expr, setpts->var_values, NULL);
frame->pts = D2TS(d);
--
1.7.6.rc1.1.g2c162b
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