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setpts: add FRAME_RATE constant

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Useful for dealing with constant frame-rate video.

(cherry picked from ffmpeg commit 722762f7e1)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Stefano Sabatini 2015-11-03 09:57:23 -08:00 committed by Anton Khirnov
parent 5e91a5c5cf
commit 018bdaed37
2 changed files with 12 additions and 0 deletions
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3
doc/filters.texi
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@ -209,6 +209,9 @@ The expression is evaluated through the eval API and can contain the following
constants:
@table @option
@item FRAME_RATE
frame rate, only defined for constant frame-rate video
@item PTS
the presentation timestamp in input

9
libavfilter/setpts.c
View File

@ -41,6 +41,7 @@
static const char *const var_names[] = {
"E", ///< Euler number
"FRAME_RATE", ///< defined only for constant frame-rate video
"INTERLACED", ///< tell if the current frame is interlaced
"N", ///< frame / sample number (starting at zero)
"PHI", ///< golden ratio
@ -59,6 +60,7 @@ static const char *const var_names[] = {
enum var_name {
VAR_E,
VAR_FRAME_RATE,
VAR_INTERLACED,
VAR_N,
VAR_PHI,
@ -115,6 +117,13 @@ static int config_input(AVFilterLink *inlink)
setpts->var_values[VAR_SR] = inlink->sample_rate;
}
setpts->var_values[VAR_FRAME_RATE] = inlink->frame_rate.num &&
inlink->frame_rate.den ?
av_q2d(inlink->frame_rate) : NAN;
// Indicate the output can be variable framerate.
inlink->frame_rate = (AVRational){1, 0};
av_log(inlink->src, AV_LOG_VERBOSE, "TB:%f\n", setpts->var_values[VAR_TB]);
return 0;
}